1. An elevator power failure emergency control method is characterized by comprising the following steps:

detecting that a power grid power supply is in a power-off state, and acquiring the current running state and the bus voltage value of an elevator tractor;

if the current running state of the elevator traction machine is a motor state and the bus voltage value is continuously reduced within a preset time, acquiring first energy provided by standby energy of an elevator, second energy generated when the elevator is decelerated to a leveling speed, third energy consumed when the elevator is decelerated to the leveling speed and fourth energy consumed when the elevator performs a leveling action;

and when the sum of the first energy and the second energy is less than the sum of the third energy and the fourth energy, the elevator is indicated to be decelerated to zero, and when the speed of the elevator is zero, the elevator is controlled to perform a leveling action.

2. The elevator power failure emergency control method according to claim 1, further comprising the steps of:

and when the sum of the first energy and the second energy is greater than the sum of the third energy and the fourth energy, the elevator is instructed to decelerate to the leveling speed, and when the speed of the elevator is the leveling speed, the elevator is controlled to perform leveling action at the leveling speed.

3. The elevator power failure emergency control method according to claim 2, wherein the step of instructing the elevator to decelerate to zero and controlling the elevator to perform a leveling operation when the current speed of the elevator is zero comprises:

indicating the elevator to decelerate to zero in the heavy load direction, and controlling the elevator to perform a leveling action in the light load direction under the condition that the speed of the elevator is zero;

the step of instructing the elevator to decelerate to the leveling speed and controlling the elevator to perform the leveling operation at the leveling speed when the speed of the elevator is the leveling speed comprises the following steps:

and indicating the elevator to decelerate to a leveling speed in a heavy load direction, and controlling the elevator to perform a leveling action in the heavy load direction under the condition that the speed of the elevator is the leveling speed.

4. The elevator power outage emergency control method of claim 1, wherein the step of instructing the elevator to slow down to zero comprises:

acquiring initial deceleration, and obtaining current deceleration according to the initial deceleration and the bus voltage value;

instructing the elevator to perform an action of decelerating to zero based on the current deceleration.

5. The elevator power failure emergency control method according to claim 4, wherein the initial deceleration is obtained according to an elevator running direction, an elevator current running speed and an elevator current load.

6. The elevator power failure emergency control method of claim 4, wherein the step of instructing the elevator to slow down to zero further comprises the steps of:

acquiring a bus voltage value of a current period, a deceleration of a previous period and a bus voltage value of the previous period;

if the bus voltage value of the current period is greater than or equal to the bus voltage value of the previous period, determining the current deceleration according to the difference value between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period and a first proportional adjustment coefficient;

and if the bus voltage value of the current period is smaller than the bus voltage value of the previous period, determining the current deceleration according to the difference value between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period and a second proportional adjustment coefficient.

7. The elevator power failure emergency control method according to claim 6, wherein the step of determining the current deceleration rate according to the difference between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration rate of the previous period, and the first proportional adjustment factor comprises:

acquiring a first product of the difference value and the first proportional adjustment coefficient, and taking the difference between the deceleration of the previous period and the first product as the current deceleration;

the step of determining the current deceleration according to the difference between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period and a second proportional adjustment coefficient comprises the following steps:

and acquiring a second product of the difference and the second proportional adjustment coefficient, and taking the sum of the deceleration of the last period and the second product as the current deceleration.

8. The elevator power failure emergency control method according to claim 1, further comprising the steps of:

and if the current running state of the elevator traction machine is a generator state and the bus voltage value is increased or kept unchanged within the preset time, indicating the elevator to keep the current speed, and stopping when the elevator reaches the leveling zone.

9. The elevator power failure emergency control method according to claim 1, wherein the step of controlling the elevator to perform a leveling operation includes:

and when the leveling signal is received and the elevator is detected to reach the middle position of the leveling zone, the elevator is instructed to execute a parking action, and an elevator brake is instructed to execute a brake-off action.

10. An elevator power failure emergency control apparatus comprising a memory and a processor, the memory storing a computer program, wherein the processor when executing the computer program implements the steps of the method of any one of claims 1 to 9.

11. The elevator power outage emergency control apparatus of claim 10, further comprising a backup power source; the standby power supply comprises a power supply for providing three-phase power for the elevator frequency converter, a main board power supply and a band-type brake power supply.

Background

As an electromechanical device, elevators require external electrical energy to maintain their traction system in operation. And if the power grid has a power failure in the elevator operation process, passengers in the elevator car can be trapped, and the elevator is generally provided with a standby power supply for conveniently rescuing the trapped passengers. When the elevator is in a power supply failure, if the elevator safety system meets the operation requirement, the elevator is switched to a standby power supply for supplying power, the elevator stops at a nearly flat floor after the operation direction is optimized, and passengers trapped in the elevator car are released.

In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the traditional power failure emergency technology has the problems of low safety, large braking impact and the like.

Disclosure of Invention

In view of the above, it is desirable to provide an elevator power failure emergency control method and apparatus that can improve safety and reduce braking impact.

In order to achieve the above object, in one aspect, an embodiment of the present invention provides an elevator power failure emergency control method, including:

detecting that a power grid power supply is in a power-off state, and acquiring the current running state and the bus voltage value of an elevator tractor;

if the current running state of the elevator traction machine is a motor state and the bus voltage value is continuously reduced within the preset time, acquiring first energy provided by elevator standby energy, second energy generated when the elevator decelerates to the leveling speed, third energy consumed when the elevator decelerates to the leveling speed and fourth energy consumed when the elevator performs the leveling action;

and when the sum of the first energy and the second energy is less than the sum of the third energy and the fourth energy, the elevator is indicated to be decelerated to zero, and when the speed of the elevator is zero, the elevator is controlled to perform a leveling action.

In one embodiment, the method further comprises the following steps:

and when the speed of the elevator is equal to the leveling speed, controlling the elevator to perform leveling action at the leveling speed.

In one embodiment, the step of instructing the elevator to decelerate to zero and controlling the elevator to perform a leveling action in the event that the current speed of the elevator is zero comprises:

the elevator is instructed to decelerate to zero in the heavy load direction, and the elevator is controlled to perform leveling action in the light load direction under the condition that the speed of the elevator is zero;

the step of instructing the elevator to decelerate to the leveling speed and controlling the elevator to perform the leveling operation at the leveling speed when the speed of the elevator is the leveling speed includes:

and instructing the elevator to decelerate to the leveling speed in the heavy load direction, and controlling the elevator to perform leveling action in the heavy load direction under the condition that the speed of the elevator is the leveling speed.

In one embodiment, the step of instructing the elevator to decelerate to zero comprises:

acquiring initial deceleration, and obtaining current deceleration according to the initial deceleration and the bus voltage value;

instructing the elevator to perform an action of decelerating to zero according to the current deceleration.

In one embodiment, the initial deceleration is obtained according to the running direction of the elevator, the current running speed of the elevator and the current load of the elevator.

In one embodiment, the step of indicating the elevator to decelerate to zero further comprises the steps of:

acquiring a bus voltage value of a current period, a deceleration of a previous period and a bus voltage value of the previous period;

if the bus voltage value of the current period is greater than or equal to the bus voltage value of the previous period, determining the current deceleration according to the difference value between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period and the first proportional adjustment coefficient;

and if the bus voltage value of the current period is smaller than the bus voltage value of the previous period, determining the current deceleration according to the difference value between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period and the second proportional adjustment coefficient.

In one embodiment, the step of determining the current deceleration according to the difference between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period, and the first proportional adjustment coefficient includes:

acquiring a first product of the difference value and a first proportional adjustment coefficient, and taking the difference between the deceleration of the previous period and the first product as the current deceleration;

the step of determining the current deceleration according to the difference value between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period and the second proportional adjustment coefficient comprises the following steps:

a second product of the difference and the second scaling factor is obtained, and the sum of the deceleration of the previous period and the second product is taken as the current deceleration.

In one embodiment, the method further comprises the following steps:

and if the current running state of the elevator traction machine is a generator state and the bus voltage value is increased or kept unchanged within the preset time, indicating the elevator to keep the current speed and stopping when the elevator reaches the leveling zone.

In one embodiment, the step of controlling the elevator to perform a leveling action comprises:

and when the leveling signal is received and the elevator is detected to reach the middle position of the leveling zone, the elevator is instructed to execute a parking action, and the elevator brake is instructed to execute a brake-off action.

On the other hand, the embodiment of the invention also provides elevator power failure emergency control equipment which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of any one of the methods when executing the computer program.

In one embodiment, a backup power supply is also included; the standby power supply comprises a power supply for providing three-phase power for the elevator frequency converter, a main board power supply and a band-type brake power supply.

One of the above technical solutions has the following advantages and beneficial effects:

according to the elevator power failure emergency control method, the current running state and the bus voltage value of the elevator traction machine are obtained when the power supply of a power grid is cut off. When the tractor is in a motor state and the bus voltage value is continuously reduced within a preset time, according to the acquired first energy, second energy, third energy and fourth energy, the elevator is indicated to perform leveling action after being decelerated to zero, after the power grid is powered off, the elevator can be slowly decelerated to stop or slowly decelerated to a low speed and then runs to a leveling layer, the normal running working condition is smoothly switched to an emergency rescue working condition, the elevator safety rescue is realized, meanwhile, the running impact force of the elevator is reduced, and the elevator safety is improved.

Drawings

The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments of the application, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the subject matter of the present application.

Fig. 1 is a first schematic flow chart diagram of an elevator power failure emergency control method in one embodiment;

fig. 2 is a second schematic flow chart diagram of an elevator power failure emergency control method in one embodiment;

fig. 3 is a first schematic flow chart of the steps of indicating the deceleration of the elevator to zero in one embodiment;

fig. 4 is a second schematic flow chart of the steps of indicating elevator deceleration to zero in one embodiment;

fig. 5 is a graph of elevator speed-deceleration-time decelerated to leveling speed and traveled to leveling zone in one embodiment;

fig. 6 is a graph of elevator speed-deceleration-time for a slow-down to flat zone after deceleration to zero speed in one embodiment;

fig. 7 is a block diagram showing the construction of an elevator power failure emergency control apparatus according to an embodiment.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various parameters, but these elements are not limited by these terms. These terms are only used to distinguish one parameter from another.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

In one embodiment, as shown in fig. 1, there is provided an elevator power failure emergency control method, including the steps of:

s110, detecting that a power grid power supply is in a power-off state, and acquiring the current running state and the bus voltage value of the elevator traction machine;

wherein the power grid power supply is used for supplying power for the daily operation of the elevator. The current operating state of the elevator traction machine may include a motor state and a generator state.

Specifically, whether the grid power supply is in the power-off state can be detected by any means in the field. The current operating state and the bus voltage value of the elevator traction machine can be obtained by any means in the field. For example, the current operation state of the elevator traction machine can be confirmed by acquiring the rotating speed and the stator speed of the traction machine, or the current operation state of the elevator traction machine can be directly extracted from an elevator main controller. The bus voltage value can be detected by a voltage transformer.

S120, if the current running state of the elevator traction machine is a motor state and the bus voltage value is continuously reduced within a preset time, acquiring first energy provided by standby energy of the elevator, second energy generated when the elevator is decelerated to a leveling speed, third energy consumed when the elevator is decelerated to the leveling speed and fourth energy consumed when the elevator performs a leveling action;

wherein the backup energy source comprises a backup battery and a bus capacitor of the elevator. The first energy comprises electric energy provided by a standby battery and electric energy stored in a bus capacitor. The flat-bed speed is the speed of self-rescue of the elevator on the flat bed, also called self-rescue speed, and is a preset value, for example, 0.1 m/s.

Specifically, the elevator traction machine generates electricity when the elevator decelerates, and the electric energy (i.e., the second energy) generated during deceleration changes according to the change of deceleration, and in a specific example, the second energy is the energy generated during the elevator decelerates to the leveling speed at the maximum deceleration. When the elevator is in a power generation state (generator state), generated energy is fed back from the motor side to the dc side, and the bus voltage is increased. The elevator is in a discharge state (motor state) and the bus voltage is lowered.

It should be noted that the elevator needs to maintain the operation of other devices in the elevator in the deceleration operation, and the required electric energy is the third energy. The fourth energy is the electric energy required by the elevator flat-bed self rescue.

Further, the first energy, the second energy, the third energy, and the fourth energy may be obtained by any means in the art. For example, the first energy may be obtained according to a calculation formula of the energy stored in the capacitor of the bus capacitor. The second energy may be derived from the load, current speed, deceleration, and flat bed speed. The third energy can be obtained from the power of the devices in the elevator. The fourth energy may be derived from the load, the flat bed distance, and the flat bed velocity.

And S130, when the sum of the first energy and the second energy is less than the sum of the third energy and the fourth energy, the elevator is indicated to be decelerated to zero, and when the speed of the elevator is zero, the elevator is controlled to perform a floor leveling action.

Specifically, when the sum of the first energy and the second energy is smaller than the sum of the third energy and the fourth energy, that is, the energy which can be provided by the elevator is smaller than the energy consumed by leveling after the elevator decelerates to the leveling speed, the elevator is instructed to decelerate to stop, and after the elevator stops, the elevator is controlled to perform the leveling action. In one embodiment, the step of controlling the elevator to perform a leveling action comprises: and when the leveling signal is received and the elevator is detected to reach the middle position of the leveling zone, the elevator is instructed to execute a parking action, and the elevator brake is instructed to execute a brake-off action.

According to the elevator power failure emergency control method, the current running state and the bus voltage value of the elevator traction machine are obtained when the power supply of a power grid is cut off. When the traction machine is in a motor state and the bus voltage value is continuously reduced within a preset time, according to the acquired first energy, second energy, third energy and fourth energy, the elevator is indicated to perform leveling action after being decelerated to zero, after the power grid is powered off, the elevator can be slowly decelerated and stopped to run to a leveling layer, the elevator can be smoothly switched from a normal running working condition to an emergency rescue working condition, the elevator safety rescue is realized, meanwhile, the impact force of the elevator running is reduced, and the elevator safety is improved.

In one embodiment, as shown in fig. 2, the method further comprises the steps of:

and S210, when the sum of the first energy and the second energy is greater than the sum of the third energy and the fourth energy, indicating the elevator to decelerate to a leveling speed, and when the speed of the elevator is the leveling speed, controlling the elevator to perform a leveling action at the leveling speed.

Specifically, if the sum of the first energy and the second energy is greater than the sum of the third energy and the fourth energy, it indicates that the energy provided by the elevator is greater than the energy consumed by leveling after the elevator decelerates to the leveling speed, it indicates that the elevator decelerates to the leveling speed, and after the elevator decelerates to the leveling speed, the elevator is controlled to perform leveling at the leveling speed.

According to the elevator power failure emergency control method, after the power grid is powered off, the elevator can slowly decelerate to a low speed and then runs to a flat layer, the normal running working condition is smoothly switched to the emergency rescue working condition, the impact force of elevator running is reduced while elevator safety rescue is realized, and the elevator safety is improved.

In one embodiment, the step of instructing the elevator to decelerate to zero and controlling the elevator to perform a leveling action in the event that the current speed of the elevator is zero comprises:

the elevator is instructed to decelerate to zero in the heavy load direction, and the elevator is controlled to perform leveling action in the light load direction under the condition that the speed of the elevator is zero;

the heavy load direction is determined according to the sum of the elevator counterweight and the elevator load and the car dead weight, if the sum of the elevator load and the car dead weight is larger than the elevator counterweight, the upward running direction of the elevator is determined as the heavy load direction, and the downward running direction of the elevator is determined as the light load direction; and if the sum of the elevator load and the self weight of the elevator car is smaller than the elevator counterweight, determining the downward running direction of the elevator as a heavy load direction, and determining the upward running direction of the elevator as a light load direction.

By the method, the energy of the standby energy of the elevator can be saved.

The step of instructing the elevator to decelerate to the leveling speed and controlling the elevator to perform the leveling operation at the leveling speed when the speed of the elevator is the leveling speed includes:

and instructing the elevator to decelerate to the leveling speed in the heavy load direction, and controlling the elevator to perform leveling action in the heavy load direction under the condition that the speed of the elevator is the leveling speed.

The heavy load direction is determined according to the sum of the elevator counterweight and the elevator load and the car dead weight, if the sum of the elevator load and the car dead weight is larger than the elevator counterweight, the upward running direction of the elevator is determined as the heavy load direction, and the downward running direction of the elevator is determined as the light load direction; and if the sum of the elevator load and the self weight of the elevator car is smaller than the elevator counterweight, determining the downward running direction of the elevator as a heavy load direction, and determining the upward running direction of the elevator as a light load direction.

By the method, the safety of the elevator in the self-rescue leveling process can be effectively improved, and the impact force is reduced.

In one embodiment, as shown in fig. 3, the step of indicating the elevator to decelerate to zero comprises:

s310, acquiring initial deceleration, and obtaining current deceleration according to the initial deceleration and the bus voltage value;

the initial deceleration is the initial deceleration in the process of decelerating to zero, and the current deceleration is the deceleration at each moment in the process of decelerating to zero.

Specifically, the current deceleration may be obtained from the initial deceleration and the bus voltage value by any means. Since the bus voltage value is changed in real time, the current deceleration is also changed in real time.

In one embodiment, the initial deceleration is obtained according to the running direction of the elevator, the current running speed of the elevator and the current load of the elevator.

Specifically, the magnitude of the deceleration is related to the magnitude of the second energy, and the larger the deceleration, the more the second energy. The initial deceleration is the deceleration corresponding to the minimum energy required for maintaining the current operation mode (leveling at the leveling speed after decelerating to the leveling speed, or leveling after decelerating to zero), i.e. the minimum deceleration.

And S320, instructing the elevator to perform an action of decelerating to zero according to the current deceleration.

By the above method, reducing the deceleration can further reduce the impact of deceleration on the human body.

In one embodiment, as shown in fig. 4, the step of indicating the elevator to decelerate to zero further comprises the steps of:

s410, acquiring a bus voltage value of the current period, a deceleration of the previous period and a bus voltage value of the previous period;

here, the period may be preset, for example, one period is 1 s. Namely, the bus voltage value at the current moment and the bus voltage value one second ago are obtained. For the second cycle, the deceleration of the previous cycle is the initial deceleration.

Specifically, the bus voltage value can be acquired and stored in real time, and can be directly retrieved from the memory when needed.

S420, if the bus voltage value of the current period is greater than or equal to the bus voltage value of the previous period, determining the current deceleration according to the difference value between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period and the first proportional adjustment coefficient;

specifically, the bus voltage value in the current period is greater than or equal to the bus voltage value in the previous period, which represents that the power generation amount of the elevator is more than the consumed energy, and the absolute value of the deceleration can be reduced according to the difference between the bus voltage value in the current period and the bus voltage value in the previous period and the first proportional adjustment coefficient. In one embodiment, the step of determining the current deceleration according to the difference between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period, and the first proportional adjustment coefficient includes: acquiring a first product of the difference value and a first proportional adjustment coefficient, and taking the difference between the deceleration of the previous period and the first product as the current deceleration;

and S430, if the bus voltage value of the current period is smaller than the bus voltage value of the previous period, determining the current deceleration according to the difference value between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period and the second proportional adjustment coefficient.

Specifically, the bus voltage value in the current period is smaller than the bus voltage value in the previous period, which represents that the power generation amount of the elevator is less than the consumed energy, and at this time, the absolute value of the deceleration can be increased according to the difference value between the bus voltage value in the current period and the bus voltage value in the previous period, the deceleration in the previous period and the second proportional adjustment coefficient, so that the power generation amount is improved. In one embodiment, the step of determining the current deceleration according to the difference between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period, and the second scaling factor comprises: a second product of the difference and the second scaling factor is obtained, and the sum of the deceleration of the previous period and the second product is taken as the current deceleration.

According to the elevator power failure emergency control method, the elevator can be in a micro power generation state, the micro power generation state means that the elevator is always in a power generation state, generated electric energy only maintains the stable or micro-rising of the bus voltage, a large amount of feedback energy cannot be generated in a short time, and the over-fast speed reduction is avoided.

In one embodiment, an elevator speed-deceleration-time plot for deceleration to leveling speed and travel to leveling zone is illustrated with reference to fig. 5. The velocity-deceleration-time diagram of an elevator traveling at a low speed to a leveling zone after decelerating to zero can be seen in fig. 6.

In one embodiment, the method further comprises the following steps:

and if the current running state of the elevator traction machine is a generator state and the bus voltage value is increased or kept unchanged within the preset time, indicating the elevator to keep the current speed and stopping when the elevator reaches the leveling zone.

Specifically, if the current operation state of the elevator traction machine is a generator state and the bus voltage value is increased or kept unchanged within a preset time, the elevator does not need to be subjected to deceleration power generation, the current speed of the elevator is indicated to be kept, and the elevator can be stopped when the elevator reaches a leveling zone. The current state of the elevator traction machine can be further judged through the bus voltage.

It should be understood that although the various steps in the flow charts of fig. 1-4 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-4 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.

In one embodiment, as shown in fig. 7, there is provided an elevator power failure emergency control apparatus including:

the detection module is used for detecting that a power grid power supply is in a power-off state and acquiring the current running state and the bus voltage value of the elevator traction machine;

the acquisition module is used for acquiring first energy provided by standby energy of the elevator, second energy generated when the elevator decelerates to the leveling speed, third energy consumed when the elevator decelerates to the leveling speed and fourth energy consumed when the elevator performs the leveling action if the current running state of the elevator traction machine is a motor state and the bus voltage value is continuously reduced within a preset time;

and the first comparison module indicates the elevator to decelerate to zero when the sum of the first energy and the second energy is less than the sum of the third energy and the fourth energy, and controls the elevator to perform floor leveling action when the speed of the elevator is zero.

In one embodiment, the method further comprises the following steps:

and the second comparison module is used for indicating the elevator to decelerate to the leveling speed under the condition that the sum of the first energy and the second energy is greater than the sum of the third energy and the fourth energy, and controlling the elevator to perform leveling action at the leveling speed under the condition that the speed of the elevator is the leveling speed.

In one of the embodiments, the first and second electrodes are,

the first comparison module is also used for indicating the elevator to decelerate to zero in the heavy load direction and controlling the elevator to perform leveling action in the light load direction under the condition that the speed of the elevator is zero;

the second comparison module is also used for indicating the elevator to decelerate to the leveling speed in the heavy load direction and controlling the elevator to perform the leveling action in the heavy load direction under the condition that the speed of the elevator is the leveling speed.

For specific limitations of the elevator power failure emergency control device, reference may be made to the above limitations of the elevator power failure emergency control method, which are not described herein again. All modules in the elevator power failure emergency control device can be completely or partially realized through software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, the elevator power failure emergency control device comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to realize the steps of any one of the elevator power failure emergency control methods.

In one embodiment, a backup power supply is also included; the standby power supply comprises a power supply for providing three-phase power for the elevator frequency converter, a main board power supply and a band-type brake power supply.

Specifically, the backup power supply may be any device capable of storing electric energy in the field.

In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:

detecting that a power grid power supply is in a power-off state, and acquiring the current running state and the bus voltage value of an elevator tractor;

if the current running state of the elevator traction machine is a motor state and the bus voltage value is continuously reduced within the preset time, acquiring first energy provided by elevator standby energy, second energy generated when the elevator decelerates to the leveling speed, third energy consumed when the elevator decelerates to the leveling speed and fourth energy consumed when the elevator performs the leveling action;

and when the sum of the first energy and the second energy is less than the sum of the third energy and the fourth energy, the elevator is indicated to be decelerated to zero, and when the speed of the elevator is zero, the elevator is controlled to perform a leveling action.

In one embodiment, the computer program when executed by the processor further performs the steps of:

and when the speed of the elevator is equal to the leveling speed, controlling the elevator to perform leveling action at the leveling speed.

In one embodiment the steps of instructing the elevator to decelerate to zero and controlling the elevator to perform a leveling action when the current speed of the elevator is zero are executed by the processor further perform the steps of:

the elevator is instructed to decelerate to zero in the heavy load direction, and the elevator is controlled to perform leveling action in the light load direction under the condition that the speed of the elevator is zero;

the step of instructing the elevator to decelerate to the leveling speed and controlling the elevator to perform the leveling operation at the leveling speed when the speed of the elevator is the leveling speed includes:

and instructing the elevator to decelerate to the leveling speed in the heavy load direction, and controlling the elevator to perform leveling action in the heavy load direction under the condition that the speed of the elevator is the leveling speed.

In one embodiment, the step of instructing the elevator to decelerate to zero when executed by the processor further performs the steps of:

acquiring initial deceleration, and obtaining current deceleration according to the initial deceleration and the bus voltage value;

instructing the elevator to perform an action of decelerating to zero according to the current deceleration.

In one embodiment, the step of instructing the elevator to decelerate to zero when executed by the processor further performs the steps of:

acquiring a bus voltage value of a current period, a deceleration of a previous period and a bus voltage value of the previous period;

if the bus voltage value of the current period is greater than or equal to the bus voltage value of the previous period, determining the current deceleration according to the difference value between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period and the first proportional adjustment coefficient;

and if the bus voltage value of the current period is smaller than the bus voltage value of the previous period, determining the current deceleration according to the difference value between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration of the previous period and the second proportional adjustment coefficient.

In one embodiment, the step of determining the current deceleration rate according to the difference between the bus voltage value of the current cycle and the bus voltage value of the previous cycle, the deceleration rate of the previous cycle, and the first proportional adjustment factor when executed by the processor further implements the steps of:

acquiring a first product of the difference value and a first proportional adjustment coefficient, and taking the difference between the deceleration of the previous period and the first product as the current deceleration;

in one embodiment, the step of determining the current deceleration rate according to the difference between the bus voltage value of the current period and the bus voltage value of the previous period, the deceleration rate of the previous period, and the second scaling factor when executed by the processor further implements the steps of:

a second product of the difference and the second scaling factor is obtained, and the sum of the deceleration of the previous period and the second product is taken as the current deceleration.

In one embodiment, the computer program when executed by the processor further performs the steps of:

and if the current running state of the elevator traction machine is a generator state and the bus voltage is increased or kept unchanged in the preset time, indicating the elevator to keep the current speed and stopping when the elevator reaches the leveling zone.

In one embodiment, the computer program when executed by the processor further performs the steps of:

and when the leveling signal is received and the elevator is detected to reach the middle position of the leveling zone, the elevator is instructed to execute a parking action, and the elevator brake is instructed to execute a brake-off action.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus DRAM (RDRAM), and interface DRAM (DRDRAM).

In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.