双温区热泵空调控制方法

Control method for double-temperature-zone heat pump air conditioner

文档序号：893 发布日期：2021-09-17 浏览：48次中文

1. A control method for a dual-temperature-zone heat pump air conditioner is characterized by comprising the following steps:

calibrating a target air outlet temperature based on the thermal load;

calibrating the temperature motor step number based on the thermal load;

establishing a corresponding relation between a heat load and a working interval of a compressor of the heat pump air conditioner;

establishing a corresponding relation between the target air outlet temperature and the rotating speed regulating quantity of the compressor of the heat pump air conditioner;

and responding to respective refrigerating/heating requests of the main and auxiliary drives, and performing double-temperature-zone control on the heat pump air conditioner according to the temperature motor step number, the compressor working interval and the compressor rotating speed regulating quantity.

2. The dual-temperature-zone heat pump air-conditioning control method according to claim 1, wherein calibrating the target outlet temperature based on the thermal load specifically comprises:

the heat load is calculated by the following formula,

TD＝K1*(T_set-25)+K2*(T_set-T_in)-K3-K4+OFFSET

where TD denotes the thermal load, T_setIndicating the set temperature, T_inExpressing indoor temperature, K1 expressing a set temperature deviation gain, taking 25 ℃ as a reference, controlling the level of heating and cooling, K2 expressing an indoor temperature deviation gain, controlling the level of heating and cooling to 25 ℃, K3 expressing environment temperature compensation OFFSET, carrying out different environment temperature compensation aiming at different environment temperatures, wherein the value of the environment temperature deviation gain is related to the environment temperature, K4 expressing sunlight compensation OFFSET, carrying out different sunlight compensation aiming at different environment temperatures, wherein the value of the environment temperature deviation gain is related to a sunlight compensation coefficient and a sunlight compensation base value, FSOFET expressing a fixed constant, the smaller the value, the stronger the refrigeration performance, the larger the value, the stronger the heating capacity;

and calibrating the temperature of the target air outlet according to the calculated value of each heat load.

3. The dual temperature zone heat pump air-conditioning control method according to claim 2, wherein the establishing of the correspondence between the heat load and the working range of the compressor of the heat pump air-conditioning specifically comprises:

under the refrigeration working condition, when the calculated value of the heat load is more than or equal to 136, the compressor of the heat pump air conditioner is closed to refrigerate; when the calculated value of the heat load is less than or equal to 120, starting a compressor of the heat pump air conditioner for refrigeration;

under the heating condition, when the calculated value of the heat load is more than or equal to 140, a compressor of the heat pump air conditioner is started to heat; and when the calculated value of the heat load is less than or equal to 135, closing the compressor of the heat pump air conditioner to heat.

4. The dual-temperature-zone heat pump air-conditioning control method according to claim 1, wherein the establishing of the correspondence between the target outlet temperature and the compressor rotation speed adjustment amount of the heat pump air-conditioner specifically comprises:

under the heating condition, the rotating speed regulating quantity of the compressor of the heat pump is calculated by the following formula at preset time intervals,

C_rpm＝P*e+I*e*|e|，

wherein, C_rpmThe method comprises the steps of expressing the adjustment quantity of the rotating speed of a compressor, wherein e is the actual air outlet temperature-target air outlet temperature and expresses the air outlet temperature difference, P and I express coefficients, when the ambient temperature is less than or equal to 5 ℃, the value of P is 1.5, the value of I is 0.6, when the ambient temperature is more than 5 ℃, the value of P is 1, and the value of I is 0.05; c_rpm> 0, indicating the need to reduce the compressor speed, C_rpmIf the rotating speed of the compressor is less than 0, the rotating speed of the compressor needs to be increased; when the rotating speed of the compressor is increased, the maximum rising speed is limited within 100rpm/s, and when the rotating speed of the compressor is reduced, the maximum falling speed is limited within 50 rpm/s;

under the refrigeration working condition, the rotating speed regulating quantity of the compressor of the heat pump is calculated by the following formula at preset time intervals,

C_rpm＝P*e+I*e*|e|

wherein, C_rpmRepresenting the adjustment quantity of the rotating speed of the compressor, wherein e is the actual air outlet temperature-target air outlet temperature and represents the target temperature difference of the air outlet, P and I represent coefficients, P is 1, I is 0.5, C_rpmGreater than 0, indicating that the compressor speed needs to be increased, C_rpmAnd < 0, the maximum rising speed is limited within 100rpm/s when the rotating speed of the compressor needs to be reduced and is increased, and the maximum falling speed is limited within 50rpm/s when the rotating speed of the compressor is reduced.

5. The dual-temperature-zone heat pump air-conditioner control method as claimed in claim 1, wherein in the case of primary and secondary drives synchronous control, the dual-temperature-zone control of the heat pump air-conditioner is performed according to the number of steps of the temperature motor, the working interval of the compressor and the adjustment amount of the rotation speed of the compressor in response to respective cooling/heating requests of the primary and secondary drives, and specifically comprises:

through air conditioner controller automatic control air-out temperature, specifically include:

when the set temperature is at the lowest temperature LO, controlling the temperature air door at the coldest position;

when the set temperature is at the intermediate temperature, automatically controlling the position of the temperature air door according to the calibration result of the step number of the temperature motor;

when the set temperature is at the highest temperature HI, controlling the temperature air door at the hottest position;

when the air conditioning system is in a closed state, the temperature air door maintains the state before closing;

when the vehicle is powered on and the air conditioning system is in a closed state, the temperature knob is set through operation, so that the air conditioner is awakened, and the temperature air door is automatically opened;

when the set temperature is at minimum temperature LO, when ambient temperature is at the arbitrary value, when the calculated value of heat load is the arbitrary value, all need to force to enter the refrigeration mode, specifically include:

if the working interval of the compressor determined according to the heat load does not allow starting refrigeration and the mode is in a non-defrosting state, the refrigeration is forced, the rotating speed of the compressor is adjusted to 1000rpm, and the temperature motor is operated to the coldest position;

if the working interval of the compressor determined according to the heat load does not allow starting refrigeration and the mode is in a defrosting state, the refrigeration is forced, the rotating speed of the compressor is adjusted to 2000rpm, and the temperature motor is operated to the coldest position;

if the working interval of the compressor determined according to the heat load allows starting refrigeration, the compressor adjusts the rotating speed according to the rotating speed adjustment quantity of the compressor so as to start refrigeration;

when the set temperature is at the maximum temperature HI, heating is performed by:

if the working interval of the compressor determined according to the heat load belongs to a heating interval, the compressor adjusts the rotating speed according to the rotating speed adjustment quantity of the compressor so as to start heating;

and if the working interval of the compressor determined according to the heat load does not belong to the heating interval, the compressor is not allowed to be started, the PTC heater is adopted for heating, the PTC heater is started at 1 gear, and the temperature air door is operated to the hottest position.

6. The dual-temperature-zone heat pump air-conditioner control method of claim 1, wherein in the case that the main and auxiliary drives are asynchronously controlled and simultaneously request refrigeration, the dual-temperature-zone control of the heat pump air-conditioner is performed according to the number of steps of the temperature motor, the working interval of the compressor and the adjustment amount of the rotating speed of the compressor in response to respective refrigeration/heating requests of the main and auxiliary drives, specifically comprising:

calculating the rotating speed of the compressor according to the smaller value of the heat loads corresponding to the main and auxiliary drives respectively so as to ensure that the rotating speed of the compressor is a high value;

looking up a table according to the calibration result of the temperature motor step number to obtain the temperature motor step number on the lower side of the thermal load;

and adjusting the step number of the temperature motor on the side with higher heat load according to the target air outlet temperature, wherein the current adjustment step number of the motor is (air outlet temperature-target air outlet temperature) multiplied by 3, if the target air outlet temperature difference is equal to the air outlet temperature-the target air outlet temperature is less than or equal to +/-2 ℃, the temperature motor is not adjusted any more, if the air outlet temperature difference is greater than 0 ℃, the step number of the motor is increased, and if the air outlet temperature difference is less than 0 ℃, the step number of the motor is reduced.

7. The dual-temperature-zone heat pump air-conditioner control method as claimed in claim 1, wherein in the case that the main and auxiliary drives are asynchronously controlled and simultaneously request heating, and the heating mode is PTC heating, the dual-temperature-zone control of the heat pump air-conditioner is performed according to the number of steps of the temperature motor, the working interval of the compressor and the adjustment amount of the rotating speed of the compressor in response to the respective cooling/heating requests of the main and auxiliary drives, specifically comprising:

determining the starting state of the PTC heater according to the higher value of the thermal loads corresponding to the main driver and the auxiliary driver respectively so as to ensure that the starting state of the PTC heater takes the higher value;

looking up a table according to the calibration result of the temperature motor step number to obtain the temperature motor step number on the side with higher heat load;

adjusting the step number of a temperature motor on the side with lower heat load according to the target air outlet temperature, wherein the current adjusting step number of the motor is (air outlet temperature-target air outlet temperature) multiplied by 3, if the air outlet target temperature difference is equal to the air outlet temperature-target air outlet temperature and is less than or equal to +/-2 ℃, the temperature motor is not adjusted any more, if the air outlet temperature difference is more than 0 ℃, the step number of the motor is increased, if the air outlet temperature difference is less than 0 ℃, the step number of the motor is reduced,

under the condition that the main and auxiliary drives are asynchronously controlled and simultaneously request heating, and the heating mode is the heating mode of the heat pump, the double-temperature-zone control of the heat pump air conditioner is carried out according to the step number of the temperature motor, the working interval of the compressor and the rotating speed regulating quantity of the compressor in response to the respective refrigerating/heating requests of the main and auxiliary drives, and the method specifically comprises the following steps:

calculating the rotating speed of the compressor according to the larger value of the heat loads corresponding to the main and auxiliary drives respectively so as to ensure that the rotating speed of the compressor takes a high value;

looking up a table according to the calibration result of the temperature motor step number to obtain the temperature motor step number on the side with higher heat load;

under the condition that the main and auxiliary drives are asynchronously controlled and simultaneously request heating, and the heating modes are heat pump and PCT for simultaneous heating, the method responds to the respective cooling/heating requests of the main and auxiliary drives, and performs double-temperature-zone control on the heat pump air conditioner according to the temperature motor step number, the compressor working interval and the compressor rotating speed regulating quantity, and specifically comprises the following steps:

looking up a table according to the calibration result of the temperature motor step number to obtain the temperature motor step number on the side with higher heat load;

and adjusting the step number of the temperature motor on the lower side of the heat load according to the target air outlet temperature, wherein the current adjustment step number of the motor is (air outlet temperature-target air outlet temperature) multiplied by 3, if the target air outlet temperature difference is equal to the air outlet temperature-the target air outlet temperature is less than or equal to +/-2 ℃, the temperature motor is not adjusted any more, if the air outlet temperature difference is greater than 0 ℃, the step number of the motor is increased, and if the air outlet temperature difference is less than 0 ℃, the step number of the motor is reduced.

8. The dual-temperature-zone heat pump air-conditioner control method as claimed in claim 1, wherein in the case that the main and auxiliary drives are asynchronously controlled and respectively request cooling and heating, and the heating modes are heat pump and PCT heating simultaneously, the dual-temperature-zone control of the heat pump air-conditioner is performed according to the respective cooling/heating requests of the main and auxiliary drives and the temperature motor step number, the compressor working interval and the compressor rotation speed adjustment amount, specifically comprising:

if the ambient temperature is higher than 15 ℃, adopting heat pump control, and operating the compressor according to a refrigeration rule, wherein the temperature motor steps corresponding to the main and auxiliary drives are obtained by looking up a table according to the calibration results of the temperature motor steps according to the respective thermal loads of the main and auxiliary drives, and the PTC heater is not allowed to be started under the working condition;

and if the ambient temperature is less than 12 ℃, operating the compressor or the PTC heater according to a heating rule, wherein the temperature motor step numbers corresponding to the main and auxiliary drives are obtained by looking up a table according to the respective thermal loads of the main and auxiliary drives and the calibration result of the temperature motor step numbers, and the temperature motor step numbers are not less than 1000.

9. The dual temperature zone heat pump air conditioning control method of claim 1, further comprising: the method for protecting the PTC heater from overheating specifically comprises the following steps:

if the feedback temperature of the PTC heater exceeds 100 ℃, the PTC relay is disconnected;

if the feedback temperature of the PTC heater is reduced to 85 ℃, the PTC relay is controlled to be turned on/off according to the control strategy of the PTC heater, and the PTC heater can normally operate;

if the temperature of the air outlet is 70 ℃ and less than 80 ℃, the PTC heater can be started to the maximum extent by 1 gear and cannot be started to the maximum extent by 2 gears and 3 gears;

if the temperature of the air outlet is higher than 80 ℃, the PTC heater is closed;

if the ambient temperature is less than or equal to-11 ℃, closing the heat pump to heat and starting the PTC to heat;

if the circulating air door control of the PTC heater is independently adopted, the control is carried out according to the larger value of the heat loads corresponding to the main and auxiliary drivers.

10. The dual temperature zone heat pump air conditioning control method of claim 1, further comprising: the PTC heater is independently adopted for heating at low temperature, and the method specifically comprises the following steps:

if the set temperature-indoor temperature is more than or equal to 10 ℃, the PTC heater is started for 3 grades;

if the set temperature-indoor temperature is less than or equal to 5 ℃, the PTC heater is started for 2 grades;

if the set temperature-indoor temperature is less than or equal to 0 ℃, the PTC heater is started at 1 gear, and after the PTC heater enters the 1 gear, the circulating air door is controlled based on the target temperature, which specifically comprises the following steps:

if the target air-out temperature-actual foot air-out temperature is more than or equal to 2 ℃, the external circulation opening degree is increased by 1%;

if the target air-out temperature-actual foot air-out temperature is less than or equal to-2 ℃, increasing the external circulation opening by 1%;

if the target air-out temperature-the actual foot air-out temperature is not changed within +/-1 ℃, the circulating air door is automatically controlled, the circulating control is changed once every 10 seconds, and the change range of the external circulation opening degree is 15-50% under the automatic control state.

Background

With the development of the heat management technology of the electric vehicle, the heat pump air conditioner is an important heat management measure for heating and energy saving in winter. The ordinary air conditioner heating in winter is mainly heated by a PTC heater, and no matter the PTC heater or the PTC water heater is essentially directly used for converting electric energy into heat energy through a PTC sheet, the theoretical efficiency is 100%, but the loss is calculated, and the actual loss is only 90%. While the efficiency of the heat pump air conditioner is 200%. According to the big data in the industry, the average energy consumption of the PTC is about 2kw in winter, while the average energy consumption of the heat pump air conditioner is about 1kw in winter, and the energy is saved by about 50%. At present, the heat pump air conditioner adopting the refrigerant R134a can only be used at the ambient temperature of more than-10 ℃, and under the condition of lower temperature, the auxiliary PTC is required to be added.

Along with the improvement of comfort requirements of people, the configuration of the dual-temperature area is more and more popular. However, the existing air conditioner control method can only realize single-temperature-zone control, cannot realize differentiation of main and auxiliary driving temperatures, and cannot realize energy conservation without adopting a heat pump system.

Therefore, a method for controlling a dual-temperature-zone heat pump air conditioner is needed.

Disclosure of Invention

The invention aims to provide a control method of a dual-temperature-zone heat pump air conditioner, which is used for solving the problems in the prior art, can realize energy conservation, and is beneficial to improving user experience because a main driver and a secondary driver can adjust the temperature of an air outlet in a differentiated mode.

The invention provides a control method of a dual-temperature-zone heat pump air conditioner, which comprises the following steps:

calibrating a target air outlet temperature based on the thermal load;

calibrating the temperature motor step number based on the thermal load;

establishing a corresponding relation between a heat load and a working interval of a compressor of the heat pump air conditioner;

establishing a corresponding relation between the target air outlet temperature and the rotating speed regulating quantity of the compressor of the heat pump air conditioner;

The method for controlling the air conditioner of the dual-temperature-zone heat pump as described above, wherein preferably, calibrating the target outlet temperature based on the heat load specifically includes:

the heat load is calculated by the following formula,

TD＝K1*(T_set-25)+K2*(T_set-T_in)-K3-K4+OFFSET

and calibrating the temperature of the target air outlet according to the calculated value of each heat load.

The method for controlling a dual-temperature-zone heat pump air conditioner as described above, wherein preferably, the establishing a correspondence between a heat load and a compressor operating zone of the heat pump air conditioner specifically includes:

The method for controlling a dual-temperature-zone heat pump air conditioner as described above, wherein preferably, the establishing of the correspondence between the target outlet temperature and the adjustment amount of the rotation speed of the compressor of the heat pump air conditioner specifically includes:

under the heating condition, the rotating speed regulating quantity of the compressor of the heat pump is calculated by the following formula at preset time intervals,

C_rpm＝P*e+I*e*|e|，

wherein, C_rpmRepresenting the adjustment quantity of the rotating speed of the compressor, wherein e is the actual air outlet temperature-target air outlet temperature and represents the air outlet temperature difference, P and I represent coefficients, and the temperature is less than or equal to 5 ℃ when the ambient temperature is lower than or equal toWhen the temperature is higher than 5 ℃, the value of P is 1.5, the value of I is 0.6, and when the temperature is higher than 5 ℃, the value of P is 1 and the value of I is 0.05; c_rpm> 0, indicating the need to reduce the compressor speed, C_rpmIf the rotating speed of the compressor is less than 0, the rotating speed of the compressor needs to be increased; when the rotating speed of the compressor is increased, the maximum rising speed is limited within 100rpm/s, and when the rotating speed of the compressor is reduced, the maximum falling speed is limited within 50 rpm/s;

under the refrigeration working condition, the rotating speed regulating quantity of the compressor of the heat pump is calculated by the following formula at preset time intervals,

C_rpm＝P*e+I*e*|e|

wherein, C_rpmRepresenting the adjustment quantity of the rotating speed of the compressor, wherein e is the actual air outlet temperature-target air outlet temperature and represents the target temperature difference of the air outlet, P and I represent coefficients, P is 1, I is 0.5, C_rpmGreater than 0, indicating that the compressor speed needs to be increased, C_rpmAnd < 0, the maximum rising speed is limited within 100rpm/s when the rotating speed of the compressor needs to be reduced and is increased, and the maximum falling speed is limited within 50rpm/s when the rotating speed of the compressor is reduced.

The above method for controlling a dual-temperature-zone heat pump air conditioner preferably includes, in a case of primary and secondary driving synchronous control, responding to respective cooling/heating requests of the primary and secondary driving, and performing dual-temperature-zone control on the heat pump air conditioner according to the number of temperature motor steps, the compressor operating interval, and the adjustment amount of the compressor rotation speed, specifically including:

through air conditioner controller automatic control air-out temperature, specifically include:

when the set temperature is at the lowest temperature LO, controlling the temperature air door at the coldest position;

when the set temperature is at the highest temperature HI, controlling the temperature air door at the hottest position;

when the air conditioning system is in a closed state, the temperature air door maintains the state before closing;

when the set temperature is at the maximum temperature HI, heating is performed by:

The control method of the dual-temperature-zone heat pump air conditioner as described above, preferably, in a case where the main and auxiliary drives are asynchronously controlled and simultaneously request cooling, the dual-temperature-zone control of the heat pump air conditioner is performed according to the number of steps of the temperature motor, the working interval of the compressor, and the adjustment amount of the rotation speed of the compressor in response to respective cooling/heating requests of the main and auxiliary drives, specifically including:

looking up a table according to the calibration result of the temperature motor step number to obtain the temperature motor step number on the lower side of the thermal load;

The above method for controlling a dual-temperature-zone heat pump air conditioner preferably includes, in the case that the main and auxiliary drives are asynchronously controlled and simultaneously request heating, and the heating mode is PTC heating, responding to respective cooling/heating requests of the main and auxiliary drives, and performing dual-temperature-zone control on the heat pump air conditioner according to the number of steps of the temperature motor, the working interval of the compressor, and the adjustment amount of the rotation speed of the compressor, specifically including:

looking up a table according to the calibration result of the temperature motor step number to obtain the temperature motor step number on the side with higher heat load;

The method for controlling a dual-temperature-zone heat pump air conditioner as described above, wherein preferably, in the case that the main and auxiliary drives are asynchronously controlled and respectively request cooling and heating, and the heating modes thereof are heat pump and PCT heating at the same time, the dual-temperature-zone control of the heat pump air conditioner is performed according to the respective cooling/heating requests of the main and auxiliary drives and the temperature motor step number, the compressor working interval and the compressor rotation speed adjustment amount, specifically comprising:

The air conditioning control method for the dual-temperature-zone heat pump as described above, wherein preferably, the method further includes: the method for protecting the PTC heater from overheating specifically comprises the following steps:

if the feedback temperature of the PTC heater exceeds 100 ℃, the PTC relay is disconnected;

if the temperature of the air outlet is 70 ℃ and less than 80 ℃, the PTC heater can be started to the maximum extent by 1 gear and cannot be started to the maximum extent by 2 gears and 3 gears;

if the temperature of the air outlet is higher than 80 ℃, the PTC heater is closed;

if the ambient temperature is less than or equal to-11 ℃, closing the heat pump to heat and starting the PTC to heat;

The air conditioning control method for the dual-temperature-zone heat pump as described above, wherein preferably, the method further includes: the PTC heater is independently adopted for heating at low temperature, and the method specifically comprises the following steps:

if the set temperature-indoor temperature is more than or equal to 10 ℃, the PTC heater is started for 3 grades;

if the set temperature-indoor temperature is less than or equal to 5 ℃, the PTC heater is started for 2 grades;

if the target air-out temperature-actual foot air-out temperature is more than or equal to 2 ℃, the external circulation opening degree is increased by 1%;

if the target air-out temperature-actual foot air-out temperature is less than or equal to-2 ℃, increasing the external circulation opening by 1%;

The invention provides a control method of a double-temperature-zone heat pump air conditioner, which can save energy sources due to the adoption of a heat pump system; according to the temperature motor step number, the compressor working interval and the compressor rotating speed regulating quantity, the heat pump air conditioner is subjected to double-temperature-zone control, a main driver user and a secondary driver user can regulate the temperature of an air outlet in a differentiated mode, the temperature can be regulated dynamically and stably, and user experience is improved; the control strategy of the double-temperature zone is adjusted based on the environmental temperature, thereby avoiding the abuse of asynchronous adjustment and reducing unnecessary energy consumption; under the working condition of the double-temperature zone, the risks that the local temperature of the PTC is too high, peculiar smell is generated or the PTC is damaged due to too low opening degree of the air door at the local temperature are avoided; under the mode is heated to independent PTC, PTC controls based on the gear, through adjusting circulation air door, also can realize the accurate regulation of air outlet temperature.

Drawings

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:

fig. 1 is a flowchart of an embodiment of a dual-temperature-zone heat pump air conditioner control method provided by the present invention.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

As used in this disclosure, "first", "second": and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be intervening components between the specific component and the first component or the second component. When it is described that a specific component is connected to other components, the specific component may be directly connected to the other components without having an intervening component, or may be directly connected to the other components without having an intervening component.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

Along with the improvement of comfort requirements of people, the configuration of the dual-temperature area is more and more popular. Based on different requirements of main and auxiliary driving passengers, intelligent adjustment of the air outlet temperature of the main and auxiliary driving in a differentiated manner becomes more and more important. However, the existing air conditioner control method can only realize single-temperature-zone control, cannot realize differentiation of main and auxiliary driving temperatures, and cannot realize energy conservation without adopting a heat pump system.

According to the invention, the temperature of the main and auxiliary drives is intelligently regulated through two sets of heating systems of the heat pump air conditioner, so that the user experience can be improved. The control method of the invention is applicable to electric air-conditioning systems and household air-conditioning systems of common pure electric vehicles, and the use scene of the control method of the double-temperature-zone heat pump air-conditioning system is not particularly limited. As shown in fig. 1, in an actual implementation process, the method for controlling a dual-temperature-zone heat pump air conditioner provided in this embodiment specifically includes the following steps:

and step S1, calibrating the target air outlet temperature based on the heat load.

Because the dual-temperature-zone heat pump air conditioner is controlled, the set temperature of the main driver needs to calculate the heat load (TD) corresponding to the main driver, and the set temperature of the auxiliary driver needs to calculate the heat load corresponding to the auxiliary driver, namely two sets of heat loads are needed, wherein the heat load is the heat required by the representation vehicle, the smaller the value of the heat load is, the hotter the heat load needs to be, the more the refrigeration needs to be, and the larger the value of the heat load is, the colder the heat load needs to be. Wherein the mode, the cycle and the air volume are executed according to the heat load corresponding to the main driver. The temperature motors are operated according to their respective thermal load values. In an embodiment of the air conditioning control method for a dual-temperature-zone heat pump of the present invention, the step S1 may specifically include:

step S11, calculating the thermal load by the following formula,

TD＝K1*(T_set-25)+K2*(T_set-T_in)-K3-K4+OFFSET

where TD denotes the thermal load, T_setIndicating the set temperature, T_inIndicating the indoor temperature, K1 indicating a set temperature deviation gain for controlling the level of heating and cooling based on a set 25 ℃, K2 indicating an indoor temperature deviation gain for controlling the level of heating and cooling to 25 ℃, K3 indicating an ambient temperature compensation offset, performing different loops for different ambient temperaturesAnd ambient temperature compensation, wherein the value of the ambient temperature compensation is related to the ambient temperature, K4 represents the sunlight amount compensation OFFSET, different sunlight compensation is carried out according to different ambient temperatures, the value of the ambient temperature compensation is related to the sunlight compensation coefficient and the sunlight compensation base value, OFFSET represents a fixed constant, the smaller the value is, the stronger the refrigeration performance is, the larger the value is, and the stronger the heating capacity is.

In the present invention, as an example and not by way of limitation, the value of K1 is 8, the value of K2 is 10, and the relationship between the value of K3 and the ambient temperature is shown in table 1.

TABLE 1 relationship between values of K3 and ambient temperature

The value of K4 is calculated by the following formula:

K4＝K_amb*K_sun，

wherein, K_ambDenotes the sun compensation factor, K_sunA base value for the solar light compensation is represented,

specifically, the sunlight compensation basic value is related to the ambient temperature and the sunlight radiation intensity, and different irradiances correspond to the sunlight intensity and the sunlight compensation basic value K_sunThe relationship is shown in Table 2.

TABLE 2T_ambWhen the temperature is 20 ℃, the sunlight compensation base value K_sunCorresponding relation table with sunlight intensity

Note: the sunlight intensity is obtained by collecting the maximum value of the sunlight intensity of the left side and the right side through the messages.

Sunlight compensation coefficient K under different environmental temperatures_ambPerformed as in Table 3, K_ambThe value of (A) is the same as K1 and K2.

TABLE 3 solar Compensation coefficient K_ambCorresponding relation table with ambient temperature

The value range of the heat load TD is 0-255, and is calculated according to 255 when the heat load TD exceeds 255, and is calculated according to 0 when the heat load TD is lower than 0.

And step S12, calibrating the target air outlet temperature according to the calculated value of each heat load.

After the heat load TD is obtained through calculation, the temperature of the target air outlet is calibrated through measurement under different heat loads TD, and the calibration result is shown in Table 4.

TABLE 4 Table of correspondence between target outlet temperature and heat load

TD	Target outlet temperature
		0	3
21	4
		37	5
53	7
		69	9
85	10
		93	12
101	14
		109	16
117	17
		125	19
135	25
		140	31
148	34
		156	37
164	40
		172	42
180	43
		188	44
196	46
		204	48
212	51
		220	54
228	57
		236	59
255	62

And step S2, calibrating the temperature motor step number based on the thermal load.

The steps of the temperature motor are calibrated by measurement under different heat loads TD, and the calibration result is shown in Table 5, wherein the TD value is a return difference interval between 109 and 120, so that the condition of the temperature motor is prevented from being changed due to the fluctuation of the TD value.

TABLE 5 temperature Motor step number and Heat load corresponding relationship Table

TD	Number of steps of temperature motor
		0	0
109	0
		120	1000
131	1200
		209	1400
255	1580

And step S3, establishing a corresponding relation between the heat load and the working interval of the compressor of the heat pump air conditioner.

In an embodiment of the air conditioning control method for a dual-temperature-zone heat pump of the present invention, the step S3 may specifically include:

step S31, under the refrigeration working condition, when the calculated value of the heat load is more than or equal to 136, closing the compressor of the heat pump air conditioner for refrigeration; and when the calculated value of the heat load is less than or equal to 120, starting a compressor of the heat pump air conditioner for refrigeration.

Therefore, under the refrigeration working condition, the calculated value of the heat load corresponding to the working interval of the compressor of the heat pump air conditioner is less than or equal to 120.

Step S32, under the heating condition, when the calculated value of the heat load is more than or equal to 140, the compressor of the heat pump air conditioner is started to heat; and when the calculated value of the heat load is less than or equal to 135, closing the compressor of the heat pump air conditioner to heat.

Therefore, under the heating condition, the calculated value of the heat load corresponding to the working interval of the compressor of the heat pump air conditioner is more than or equal to 140.

And step S4, establishing a corresponding relation between the target air outlet temperature and the rotating speed regulating quantity of the compressor of the heat pump air conditioner.

In an embodiment of the air conditioning control method for a dual-temperature-zone heat pump of the present invention, the step S4 may specifically include:

step S41, under the heating condition, calculating the speed regulation of the compressor of the heat pump by the following formula at preset time intervals,

C_rpm＝P*e+I*e*|e|，

wherein, C_rpmThe method comprises the steps of expressing the adjustment quantity of the rotating speed of a compressor, wherein e is the actual air outlet temperature-target air outlet temperature and expresses the air outlet temperature difference, P and I express coefficients, when the ambient temperature is less than or equal to 5 ℃, the value of P is 1.5, the value of I is 0.6, when the ambient temperature is more than 5 ℃, the value of P is 1, and the value of I is 0.05; c_rpm> 0, indicating the need to reduce the compressor speed, C_rpmIf the rotating speed of the compressor is less than 0, the rotating speed of the compressor needs to be increased; when the rotation speed of the compressor is increased, the maximum rising rate is limited within 100rpm/s, when the rotation speed of the compressor is reduced, the maximum falling rate is limited within 50rpm/s, and the rotation speed adjusting period can be 4s each time.

Step S42, under the refrigeration condition, at preset time intervals, calculating the rotating speed regulating quantity of the compressor of the heat pump through the following formula,

C_rpm＝P*e+I*e*|e|

wherein, C_rpmRepresenting the adjustment quantity of the rotating speed of the compressor, wherein e is the actual air outlet temperature-target air outlet temperature and represents the target temperature difference of the air outlet, P and I represent coefficients, P is 1, I is 0.5, C_rpmGreater than 0, indicating that the compressor speed needs to be increased, C_rpmThe term < 0 indicates that the compressor rotation speed needs to be reduced, the maximum rising rate is limited within 100rpm/s when the compressor rotation speed is increased, the maximum falling rate is limited within 50rpm/s when the compressor rotation speed is reduced, and the rotation speed adjusting period can be 4s each time.

And step S5, responding to respective cooling/heating requests of the main and auxiliary drives, and performing double-temperature-zone control on the heat pump air conditioner according to the temperature motor step number, the compressor working interval and the compressor rotating speed regulating quantity.

The left/right air outlet temperature is set with 2 control modes: synchronous control and asynchronous control; the SYNC (asynchronous) key is not operated, the air conditioner with the double temperature zones enters a synchronous state, any temperature knob is adjusted, and the temperature of the double zones is synchronously changed; after a user operates the SYNC key, the air conditioner in the dual-temperature area enters asynchronous control, the knobs of all the temperature areas are adjusted, and the temperature setting of all the temperature areas is changed.

In an embodiment of the dual-temperature-zone heat pump air-conditioning control method according to the present invention, in the case of primary and secondary driving synchronous control, the step S5 may specifically include:

step A1, automatically controlling the air outlet temperature through an air conditioner controller, and specifically comprising the following steps:

step a11, when the set temperature is at the lowest temperature LO, controls the temperature damper at the coldest position. Wherein the minimum temperature LO is 17 ℃.

And step A12, when the set temperature is at the intermediate temperature, automatically controlling the position of the temperature air door according to the calibration result (table 5) of the temperature motor step number. Wherein the intermediate temperature is 18-31 ℃.

Step a13, controlling the temperature damper at the hottest position when the set temperature is at the maximum temperature HI. The maximum temperature HI was 32 ℃.

Step A2, when the air conditioning system is in the closed state, the temperature damper is maintained in the state before the temperature damper is closed.

Step a3, when the vehicle is powered on and the air conditioning system is in a closed state, the air conditioner is awakened by operating the set temperature knob, and the temperature damper is automatically opened, and the control modes when the set temperatures are respectively the lowest temperature LO and the highest temperature HI are described below.

In the first case, when the set temperature is at the lowest temperature LO, and when the ambient temperature is at an arbitrary value, and the calculated value of the thermal load is an arbitrary value, the cooling mode needs to be forcibly entered, that is, when the set temperature is at the lowest temperature LO, the cooling mode needs to be forcibly entered regardless of the ambient temperature and the TD value, and specifically includes:

and if the working interval of the compressor determined according to the heat load does not allow starting refrigeration and the mode is in a non-defrosting state, forcibly refrigerating, adjusting the rotating speed of the compressor to 1000rpm, and operating the temperature motor to the coldest position.

As mentioned above, under the refrigeration condition, when the calculated value of the heat load is larger than or equal to 136, the compressor of the heat pump air conditioner is closed for refrigeration, namely the refrigeration is not allowed to be started.

And if the working interval of the compressor determined according to the heat load does not allow starting refrigeration and the mode is in a defrosting state, forcibly refrigerating, adjusting the rotating speed of the compressor to 2000rpm, and operating the temperature motor to the coldest position.

And if the working interval of the compressor determined according to the heat load allows starting refrigeration, the compressor adjusts the rotating speed according to the rotating speed adjustment quantity of the compressor so as to start refrigeration.

As described above, the compressor speed adjustment is calculated based on the target outlet temperature and the actual outlet temperature. And under the refrigeration working condition, when the calculated value of the heat load is less than or equal to 120, the compressor of the heat pump air conditioner is started for refrigeration, namely the refrigeration is allowed to be started.

In the second case, when the set temperature is at the maximum temperature HI, heating is performed by:

and if the working interval of the compressor determined according to the heat load belongs to a heating interval, the compressor adjusts the rotating speed according to the rotating speed adjustment quantity of the compressor so as to start heating.

As described above, the compressor speed adjustment is calculated based on the target outlet temperature and the actual outlet temperature. And in the heating condition, when the calculated value of the heat load is more than or equal to 140, the compressor of the heat pump air conditioner is started to heat, namely, the air conditioner belongs to a heating interval.

And if the working interval of the compressor determined according to the heat load does not belong to the heating interval, the compressor is not allowed to be started, the PTC heater is adopted for heating, the PTC heater is started at 1 gear, and the temperature air door is operated to the hottest position.

As described above, in the heating condition, when the calculated value of the heat load is less than or equal to 135, the compressor of the heat pump air conditioner is turned off to heat, that is, the heating is not allowed.

In an embodiment of the dual-temperature-zone heat pump air-conditioning control method of the present invention, in the case that the primary and secondary driving are asynchronously controlled and refrigeration is requested at the same time, the step S5 may specifically include:

and step B1, calculating the rotating speed of the compressor according to the smaller value of the heat loads corresponding to the main and auxiliary drives respectively, so as to ensure that the rotating speed of the compressor is a high value.

For example, if the TD value for the main drive is 30 and the TD value for the sub drive is 80, the compressor rotation speed is calculated according to the smaller TD value of 30 (corresponding to the main drive).

And step B2, looking up a table according to the calibration result (table 5) of the temperature motor step number to obtain the temperature motor step number on the side with lower heat load.

In table 5, the value TD is 30, and the step number of the temperature motor for driving is obtained by looking up a table, and at this time, the step number of the temperature motor for driving is 0.

And step B3, adjusting the step number of the temperature motor on the side with higher heat load according to the target air outlet temperature, wherein the current adjustment step number of the motor is (air outlet temperature-target air outlet temperature) multiplied by 3, if the target air outlet temperature difference is equal to the air outlet temperature-target air outlet temperature which is less than or equal to +/-2 ℃, the temperature motor is not adjusted, if the air outlet temperature difference is greater than 0 ℃, the step number of the motor is increased, and if the air outlet temperature difference is less than 0 ℃, the step number of the motor is reduced.

And adjusting the temperature of the auxiliary driving motor according to the target air outlet temperature, wherein the current adjusting step number of the motor is (the temperature of the auxiliary driving air outlet-the target air outlet temperature) multiplied by 3. The target air outlet temperature is obtained by looking up a table according to a calibration result (table 4) of the target air outlet temperature. It should be noted that, if the primary driving TD is smaller than the secondary driving, the number of steps of the secondary driving motor cannot be smaller than that of the primary driving; conversely, if the copilot TD is smaller than the primary TD, the number of steps of the primary motor cannot be smaller than the copilot TD.

Further, in an embodiment of the dual-temperature-zone heat pump air-conditioning control method according to the present invention, in the case that the primary and secondary drives are asynchronously controlled and simultaneously request heating, and the heating mode of the primary and secondary drives is PTC heating, the step S5 may specifically include:

and step C1, determining the starting state of the PTC heater according to the higher value of the heat load corresponding to the main and auxiliary drivers so as to ensure that the starting state of the PTC heater takes the higher value.

For example, if the TD value for the primary driver is 209 and the TD value for the secondary driver is 180, the on state of the PTC heater is calculated according to the value 209 with the larger TD value (corresponding to the primary driver).

And step C2, looking up a table according to the calibration result (table 5) of the temperature motor step number to obtain the temperature motor step number on the side with higher heat load.

In table 5, the value of TD is 209, and the number of steps of the temperature motor for driving is obtained by looking up a table, and the number of steps of the temperature motor for driving is 1400.

And C3, adjusting the step number of the temperature motor on the lower side of the heat load according to the target air outlet temperature, wherein the current adjustment step number of the motor is (air outlet temperature-target air outlet temperature) multiplied by 3, if the target air outlet temperature difference is equal to the air outlet temperature-target air outlet temperature which is less than or equal to +/-2 ℃, the temperature motor is not adjusted, if the air outlet temperature difference is greater than 0 ℃, the step number of the motor is increased, and if the air outlet temperature difference is less than 0 ℃, the step number of the motor is reduced.

And the auxiliary driving temperature motor is used for adjusting according to the temperature of the target air outlet. The current adjustment step number of the motor is (temperature of the auxiliary driving air outlet-target air outlet) multiplied by 3. The target air outlet temperature is obtained by looking up a table according to a calibration result (table 4) of the target air outlet temperature. It should be noted that, if the primary drive TD is greater than the secondary drive, the number of steps of the secondary drive motor cannot be greater than that of the primary drive; conversely, if the copilot TD is larger than the primary TD, the number of steps of the primary motor cannot be larger than the copilot TD.

and D1, calculating the rotating speed of the compressor according to the larger value of the heat loads corresponding to the main and auxiliary drives respectively, so as to ensure that the rotating speed of the compressor is a high value.

For example, if the TD value for the main drive is 209 and the TD value for the sub drive is 180, the compressor rotation speed is calculated according to the value 209 with the larger TD value (corresponding to the main drive).

And D2, looking up a table according to the calibration result (table 5) of the temperature motor step number to obtain the temperature motor step number on the side with higher heat load.

And D3, adjusting the step number of the temperature motor on the lower side of the heat load according to the target air outlet temperature, wherein the current adjustment step number of the motor is (air outlet temperature-target air outlet temperature) multiplied by 3, if the target air outlet temperature difference is equal to the air outlet temperature-target air outlet temperature which is less than or equal to +/-2 ℃, the temperature motor is not adjusted, if the air outlet temperature difference is greater than 0 ℃, the step number of the motor is increased, and if the air outlet temperature difference is less than 0 ℃, the step number of the motor is reduced.

And the auxiliary driving temperature motor is adjusted according to the target temperature of the air outlet. The current adjustment step number of the motor is (temperature of the auxiliary driving air outlet-target air outlet) multiplied by 3. The target air outlet temperature is obtained by looking up a table according to a calibration result (table 4) of the target air outlet temperature. It should be noted that, if the primary drive TD is greater than the secondary drive, the number of steps of the secondary drive motor cannot be greater than that of the primary drive; conversely, if the copilot TD is larger than the primary TD, the number of steps of the primary motor cannot be larger than the copilot TD.

Further, in an embodiment of the dual-temperature-zone heat pump air-conditioning control method according to the present invention, in the case that the primary and secondary systems are asynchronously controlled and simultaneously request heating, and the heating mode of the primary and secondary systems is the heat pump and the PCT simultaneously heating, the step S5 may specifically include:

and E1, calculating the rotating speed of the compressor according to the larger value of the heat loads corresponding to the main and auxiliary drives respectively, so as to ensure that the rotating speed of the compressor is high, and the opening state of the PTC heater is also high.

And E2, looking up a table according to the calibration result (table 5) of the temperature motor step number to obtain the temperature motor step number on the side with higher heat load.

And E3, adjusting the step number of the temperature motor on the lower side of the heat load according to the target air outlet temperature, wherein the current adjustment step number of the motor is (air outlet temperature-target air outlet temperature) multiplied by 3, if the target air outlet temperature difference is equal to the air outlet temperature-target air outlet temperature which is less than or equal to +/-2 ℃, the temperature motor is not adjusted, if the air outlet temperature difference is greater than 0 ℃, the step number of the motor is increased, and if the air outlet temperature difference is less than 0 ℃, the step number of the motor is reduced.

Further, in an embodiment of the dual-temperature-zone heat pump air-conditioning control method according to the present invention, in the case that the primary and secondary systems are asynchronously controlled and respectively request cooling and heating, and the heating modes thereof are heat pump and PCT heating at the same time, the step S5 may specifically include:

and step F1, if the ambient temperature is higher than 15 ℃, adopting heat pump control, and operating the compressor according to a refrigeration rule, wherein the temperature motor step numbers corresponding to the main and auxiliary drives are obtained by table lookup according to the respective heat loads of the main and auxiliary drives and the calibration result (table 5) of the temperature motor step numbers, and the PTC heater is not allowed to be started under the working condition.

In one embodiment of the invention, the ambient temperature is greater than 15 ℃, and if the primary drive requests cooling, the secondary drive requests heating. At the moment, the auxiliary driver only needs to open the temperature air door and obtain heat through the condenser in the automobile. From the viewpoint of energy saving and user requirements, the PTC heater does not need to be turned on for heating.

And F2, if the ambient temperature is less than 12 ℃, operating the compressor or the PTC heater according to the heating rule, wherein the temperature motor step numbers corresponding to the main and auxiliary drives are obtained by table lookup according to the respective thermal loads of the main and auxiliary drives and the calibration result (table 5) of the temperature motor step numbers, and the temperature motor step numbers are not less than 1000.

The return difference interval is set between the ambient temperature of 12 ℃ and 15 ℃.

Further, the present invention, in some embodiments, further comprises:

and step S6, performing overheating protection on the PTC heater.

In an embodiment of the air conditioning control method for a dual-temperature-zone heat pump of the present invention, the step S6 may specifically include:

and step S61, if the feedback temperature of the PTC heater exceeds 100 ℃, the PTC relay is disconnected.

And step S62, if the feedback temperature of the PTC heater is reduced to 85 ℃, controlling the PTC relay to be turned on/off according to the control strategy of the PTC heater, and enabling the PTC heater to normally operate.

And step S63, if the temperature of the air outlet is 70 ℃ and less than 80 ℃, the PTC heater can be started at the maximum of 1 gear and cannot be started at the 2 gear and the 3 gear.

And step S64, if the temperature of the air outlet is higher than 80 ℃, the PTC heater is closed.

And step S65, if the room ambient temperature is less than or equal to-11 ℃, closing the heat pump to heat and starting the PTC to heat.

And step S66, if the circulation air valve control of the PTC heater is adopted independently, the control is carried out according to the larger value of the heat loads corresponding to the main and auxiliary drives.

Still further, the present invention, in some embodiments, further comprises:

and step S7, heating by adopting a PTC heater alone at low temperature.

In an embodiment of the air conditioning control method for a dual-temperature-zone heat pump of the present invention, the step S7 may specifically include:

and step S71, if the set temperature-the indoor temperature is more than or equal to 10 ℃, the PTC heater is started by 3 steps.

And step S72, if the set temperature-indoor temperature is less than or equal to 5 ℃, the PTC heater is started by 2 steps.

And step S73, if the set temperature-indoor temperature is less than or equal to 0 ℃, the PTC heater is started at 1 gear, and after the PTC heater enters the 1 gear, the circulating air door is controlled based on the target temperature. The corresponding relation between the target outlet air temperature after the PTC heater enters the gear 1 and the heat load TD value is shown in the table 6.

TABLE 6 corresponding relationship between target outlet air temperature and thermal load TD value after PTC heater enters 1 gear

TD	Target outlet air temperature
		130	23
135	25
		140	31
148	34
		156	37
164	40
		172	42
180	43
		188	44
196	46
		204	48
212	51
		220	54
228	57
		236	59
255	62

Specifically, if the target outlet air temperature-the actual foot outlet air temperature is more than or equal to 2 ℃, the external circulation opening degree of the circulation air door is increased by 1%; and if the target air outlet temperature-the actual foot air outlet temperature is less than or equal to-2 ℃, increasing the external circulation opening of the circulation air door by 1%.

And step S74, if the target air outlet temperature-the actual foot air outlet temperature is not changed within +/-1 ℃, automatically controlling a circulating air door, wherein the circulating control is changed once every 10 seconds, and the change range of the external circulation opening degree is 15-50% in the automatic control state.

According to the control method of the dual-temperature-zone heat pump air conditioner, the heat pump system is adopted, so that energy can be saved; according to the temperature motor step number, the compressor working interval and the compressor rotating speed regulating quantity, the heat pump air conditioner is subjected to double-temperature-zone control, a main driver user and a secondary driver user can regulate the temperature of an air outlet in a differentiated mode, the temperature can be regulated dynamically and stably, and user experience is improved; the control strategy of the double-temperature zone is adjusted based on the environmental temperature, thereby avoiding the abuse of asynchronous adjustment and reducing unnecessary energy consumption; under the working condition of the double-temperature zone, the risks that the local temperature of the PTC is too high, peculiar smell is generated or the PTC is damaged due to too low opening degree of the air door at the local temperature are avoided; under the mode is heated to independent PTC, PTC controls based on the gear, through adjusting circulation air door, also can realize the accurate regulation of air outlet temperature.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

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