1. A maintenance method for an AMT (automated mechanical transmission) based on a pure electric commercial vehicle is characterized by comprising the following steps:

acquiring the information of the driving mileage of the vehicle, the production time of the vehicle and the liquid level information of lubricating oil in a gearbox;

when the liquid level position of the lubricating oil is lower than a preset low value or higher than a preset high value, the TCU controller outputs a lubricating oil maintenance signal, then the driving mileage of the vehicle after the lubricating oil maintenance signal is output is obtained, lubricating oil fault signals of different levels are output according to different driving miles, and the output power of the vehicle is controlled according to the lubricating oil fault signals of different levels;

and outputting a first maintenance signal when the mileage information or the production time information is larger than a corresponding set value, outputting maintenance alarm signals of different levels according to the current mileage, and controlling the output power of the vehicle according to the maintenance alarm signals of different levels.

2. The AMT transmission maintenance method based on the pure electric commercial vehicle according to claim 1, wherein the lubricating oil fault signals of different levels are output according to the following method:

only outputting a 1-level lubricating oil fault signal when the vehicle runs less than 500 Km;

when the running distance of the vehicle is 500-5000 kilometers, the TCU controller outputs a 2-level lubricating oil fault signal and requests the VCU controller to limit the vehicle power to 70% of the rated power;

when the running distance of the vehicle is 5000-10000 km, the TCU controller outputs a 3-level lubricating oil fault signal and requests the VCU controller to limit the vehicle power to 50% of the rated power;

when the vehicle driving distance exceeds 10000 km, the TCU controller outputs a 3-level lubricating oil fault signal and requests the VCU controller to stop the work of the transmission.

3. The AMT transmission maintenance method based on the pure electric commercial vehicle according to claim 1, characterized in that the maintenance alarm signals of different levels are output according to the following method:

when the driving mileage of the vehicle is more than 5-10% of the set value, the TCU controller outputs a level 1 maintenance alarm signal;

when the driving mileage of the current vehicle is 10% -100% of the set value, the TCU controller outputs a 2-level maintenance alarm signal and limits the output power of the transmission to 70% of the rated power;

when the driving mileage of the current vehicle is more than 100% -200% of the set value, the TCU controller outputs a 3-level maintenance alarm signal and limits the output power of the transmission to 50% of the rated power;

when the driving mileage of the current vehicle is more than 200% of the set value, the TCU controller outputs a 4-level maintenance alarm signal and requests the VCU controller to stop the work of the transmission.

4. The AMT transmission maintenance method based on the pure electric commercial vehicle according to claim 1, wherein a liquid level sensor is arranged on a shell of the gearbox, and liquid level information of lubricating oil is obtained through the liquid level sensor.

5. The AMT maintenance method based on the pure electric commercial vehicle according to claim 1, wherein a rotating speed sensor is arranged on an output shaft of the gearbox, rotating speed information of the output shaft of the gearbox is obtained through the rotating speed sensor, and the driving mileage of the vehicle is obtained according to the rotating speed information.

6. The AMT maintenance method based on the pure electric commercial vehicle as recited in claim 1, wherein a sensor is arranged on a gearbox shell, and liquid level information of the gearbox is obtained through the sensor.

7. A system based on an AMT transmission maintenance method of a pure electric commercial vehicle according to any one of claims 1-6, characterized by comprising a rotating speed sensor (8), a liquid level sensor, a TCU controller (6) and a VCU controller (7);

the rotating speed sensor (8) is connected with an output shaft of the AMT transmission (1), the liquid level sensor is installed on a shell of the AMT transmission, the rotating speed sensor (8) and the liquid level sensor are both connected with the VCU controller, and the VCU controller is connected with the TCU controller;

the speed sensor (8) is used for measuring the rotating speed of an output shaft of the gearbox, the liquid level sensor is used for monitoring the position of lubricating oil in the gearbox, the VCU controller is used for receiving information measured by the sensor and sending the received information to the TCU controller, and the TCU controller outputs an alarm signal according to the rotating speed information and the liquid level information and sends power control information of the gearbox to the TCU controller.

8. The system for AMT transmission maintenance method based on pure electric commercial vehicle according to claim 7, wherein the liquid level sensor comprises a lower limit photoelectric sensor (3) and an upper limit photoelectric sensor (4); the upper limit photoelectric sensor (4) is arranged at the upper limit position of the normal lubricating oil liquid level, and the lower limit photoelectric sensor (3) is arranged at the lower limit position of the lubricating oil liquid level.

Background

New energy commercial vehicles gradually enter the market, and the reliability of the vehicles is concerned by terminal customers and operators. In the customer operation, the maintenance and the maintenance of the new energy AMT transmission are often forgotten or ignored, so that the reliability fault related to the transmission machinery of the vehicle occurs, and the customer complaint is received, and the customer operation is influenced, so that the economic loss is caused. Even customer self-service repairs may be required when this failure is resolved, further compounding customer complaints.

At present, there is no special prompt mode for maintaining the AMT transmission of the new energy commercial vehicle, and the AMT transmission is the same as the manual transmission of the traditional commercial vehicle, only written information such as 5000 Km/1-year first-guaranteed mileage or checking graphic representation of lubricating oil liquid level of the transmission every 2 kilometers is marked in a vehicle use manual, and in the face of heavy operation pressure, a customer often forgets to drive the vehicle to a maintenance service station for maintenance.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides an AMT (automated mechanical transmission) maintenance system and method based on a pure electric commercial vehicle.

The invention is realized by the following technical scheme:

a maintenance method of an AMT (automated mechanical transmission) based on a pure electric commercial vehicle comprises the following steps:

acquiring the information of the driving mileage of the vehicle, the production time of the vehicle and the liquid level information of lubricating oil in a gearbox;

when the liquid level position of the lubricating oil is lower than a preset low value or higher than a preset high value, the TCU controller outputs a lubricating oil maintenance signal, then the driving mileage of the vehicle after the lubricating oil maintenance signal is output is obtained, lubricating oil fault signals of different levels are output according to different driving miles, and the output power of the vehicle is controlled according to the lubricating oil fault signals of different levels;

and outputting a first maintenance signal when the mileage information or the production time information is larger than a corresponding set value, outputting maintenance alarm signals of different levels according to the current mileage, and controlling the output power of the vehicle according to the maintenance alarm signals of different levels.

Preferably, the output method of the lubricating oil fault signals of different levels is as follows:

and only outputting a 1-level lubricating oil fault signal when the vehicle runs less than 500 Km.

When the running distance of the vehicle is 500-5000 kilometers, the TCU controller outputs a 2-level lubricating oil fault signal and requests the VCU controller to limit the vehicle power to 70% of the rated power;

when the running distance of the vehicle is 5000-10000 km, the TCU controller outputs a 3-level lubricating oil fault signal and requests the VCU controller to limit the vehicle power to 50% of the rated power;

when the vehicle driving distance exceeds 10000 km, the TCU controller outputs a 3-level lubricating oil fault signal and requests the VCU controller to stop the work of the transmission.

Preferably, the output method of the maintenance alarm signals of different levels is as follows:

when the driving mileage of the vehicle is more than 5-10% of the set value, the TCU controller outputs a level 1 maintenance alarm signal;

when the driving mileage of the current vehicle is 10% -100% of the set value, the TCU controller outputs a 2-level maintenance alarm signal and limits the output power of the transmission to 70% of the rated power;

when the driving mileage of the current vehicle is more than 100-200% of the set value, the TCU controller outputs a 3-level maintenance alarm signal and limits the output power of the transmission to 50% of the rated power.

When the driving mileage of the current vehicle is more than 200% of the set value, the TCU controller outputs a 4-level maintenance alarm signal and requests the VCU controller to stop the work of the transmission.

Preferably, a shell of the gearbox is provided with a liquid level sensor, and the liquid level information of the lubricating oil is acquired through the liquid level sensor.

Preferably, a rotating speed sensor is arranged on an output shaft of the gearbox, rotating speed information of the output shaft of the gearbox is obtained through the rotating speed sensor, and the driving mileage of the vehicle is obtained according to the rotating speed information.

Preferably, a sensor is arranged on the gearbox shell, and liquid level information of the gearbox is acquired through the sensor.

A system based on an AMT transmission maintenance method of a pure electric commercial vehicle comprises a rotating speed sensor, a liquid level sensor, a TCU controller and a VCU controller;

the rotating speed sensor is connected with an output shaft of the AMT, the liquid level sensor is installed on a shell of the AMT, the rotating speed sensor and the liquid level sensor are both connected with the VCU controller, and the VCU controller is connected with the TCU controller.

The speed sensor is used for measuring the rotating speed of an output shaft of the gearbox, the liquid level sensor is used for monitoring the position of lubricating oil in the gearbox, the VCU controller is used for receiving information measured by the sensor and sending the received information to the TCU controller, and the TCU controller outputs an alarm signal according to the rotating speed information and the liquid level information and sends power control information of the gearbox to the TCU controller.

Preferably, the liquid level sensor comprises a lower limit photoelectric sensor and an upper limit photoelectric sensor; the upper limit photoelectric sensor is arranged at the upper limit position of the normal lubricating oil liquid level, and the lower limit photoelectric sensor is arranged at the lower limit position of the lubricating oil liquid level.

Compared with the prior art, the invention has the following beneficial technical effects:

the invention provides a maintenance method of an AMT (automated mechanical transmission) based on a pure electric commercial vehicle, which comprises the steps of obtaining travel mileage information of a vehicle, production time of the vehicle and liquid level information of lubricating oil in a gearbox, comparing the liquid level information and the travel mileage information with set values respectively, outputting a first maintenance signal or/and the lubricating oil maintenance information according to a comparison result, outputting alarm signals of different levels according to mileage, and controlling the output power of the vehicle according to the alarm signals of the different levels; this side is correct effectual will pure electric commercial car's AMT derailleur maintenance information transfer for the user, and the suggestion is given under the condition of user's time buffering in time to maintain the AMT derailleur, and unnecessary economic loss of customer that this method was avoided leading to because of leaking protecting has also reduced the fault rate of AMT derailleur simultaneously.

Drawings

FIG. 1 is a flow chart of a maintenance method of the present invention.

FIG. 2 is a block diagram of the transmission of the present invention.

In the figure: 1. an AMT transmission; 2. an oil filling hole; 3. a lower limit photosensor; 4. an upper limit photosensor; 5. an oil drain hole; 6. a TCU controller (vehicle control unit); 7. VCU controllers (transmission controllers); 8. a rotational speed sensor; 9. and (4) an instrument panel.

Detailed Description

The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.

Referring to fig. 1, a method for maintaining an AMT transmission based on a pure electric commercial vehicle includes a vehicle first-time maintenance method and a transmission lubrication oil maintenance method.

The first vehicle maintenance method comprises the following steps:

step 1, obtaining the information of the driving mileage of the vehicle and the production time of the vehicle.

Specifically, the TCU controller calls an AMT transmission output shaft rotating speed parameter, the driving mileage is calculated according to the rotating speed parameter, and the TCU controller calls and stores vehicle VIN code information through the VCU controller to acquire the vehicle production time.

And 2, outputting a first maintenance signal when the mileage signal or the time signal is greater than a corresponding set value, indicating that the vehicle is to be maintained for the first time, sending a maintenance signal to a vehicle instrument panel by the TCU controller, and lighting a transmission oil first-protection indicator lamp by the instrument panel.

After the acquired mileage signal or time signal is larger than a first-protection set value, the TCU controller sends a first-maintenance signal to a vehicle instrument panel through a vehicle CAN message, the instrument panel lights a transmission oil first-protection indicator lamp, and a transmission manufacturer is displayed in an instrument submenu to maintain a 400-hotline phone for 24 hours.

And 3, outputting alarm signals of different levels by the TCU controller according to the current driving mileage, and controlling the output power of the vehicle according to the alarm signals of different levels.

The maintenance alarm signals of different levels are divided into four levels of maintenance alarm signals, and the four levels of maintenance alarm signals are specifically as follows:

when the driving mileage of the vehicle is more than 5-10% of the set value, the TCU controller outputs a level 1 maintenance alarm signal.

When the driving mileage of the current vehicle is 10% -100% of the set value, the TCU controller outputs a 2-level maintenance alarm signal and limits the output power of the transmission to 70% of the rated power;

when the driving mileage of the current vehicle is more than 100-200% of the set value, the TCU controller outputs a 3-level maintenance alarm signal and limits the output power of the transmission to 50% of the rated power.

When the driving mileage of the current vehicle is more than 200% of the set value, the TCU controller outputs a 4-level maintenance alarm signal and requests the VCU controller to stop the work of the transmission.

For example, the first maintenance mileage of the vehicle is 5000Km, when the driving mileage of the vehicle is 5000Km, the first protection indicator lamp is turned on, and when the current driving mileage of the vehicle is 5500-6000Km, the TCU controller outputs a level 1 maintenance alarm signal.

When the current vehicle driving distance is 5500 plus 10000 kilometers, the TCU controller outputs a secondary maintenance alarm signal and requests the VCU controller to limit the vehicle power to 70% of the original power;

when the vehicle driving distance is 10000-15000 kilometers, the TCU controller outputs a three-level maintenance alarm signal and requests the VCU to enter a limp-home mode, and the power is limited to the original 50%.

When the vehicle driving distance exceeds 15000 kilometers, the TCU controller outputs a 4-level maintenance alarm signal and requests the VCU controller to stop the work of the transmission.

And 4, after the vehicle is maintained for the first time, a maintenance worker is connected with the vehicle TCU through the upper computer, and the functions are permanently closed through manual calibration.

The maintenance method of the lubricating oil of the gearbox comprises the following steps:

and step 100, the TCU controller acquires the liquid level position of lubricating oil in the gearbox.

And 101, when the liquid level position of the lubricating oil is lower than a preset low value or higher than a preset high value, outputting a lubricating oil maintenance signal by the TCU controller.

And 103, acquiring the driving mileage of the vehicle after the lubricating oil maintenance signal is output, outputting lubricating oil fault signals of different levels according to different driving mileage, and controlling the output power of the vehicle according to the lubricating oil fault signals of different levels.

Specifically, after the lubricating oil indicator lamp is lightened, the TCU controller synchronously calculates and stores the vehicle driving mileage, and only outputs a 1-level lubricating oil fault signal when the vehicle runs less than 500 Km.

When the running distance of the vehicle is 500-5000 kilometers, the TCU controller outputs a 2-level lubricating oil fault signal and requests the VCU controller to limit the vehicle power to 70% of the rated power;

when the running distance of the vehicle is 5000-10000 km, the TCU controller outputs a 3-level lubricating oil fault signal and requests the VCU controller to limit the vehicle power to 50% of the rated power;

when the vehicle driving distance exceeds 10000 km, the TCU controller outputs a 3-level lubricating oil fault signal and requests the VCU controller to stop the work of the transmission.

Referring to fig. 2, the invention further provides a maintenance system of the AMT transmission based on the pure electric commercial vehicle, which includes a rotation speed sensor 8, a lower limit photoelectric sensor 3, an upper limit photoelectric sensor 4, a TCU controller 6 and a VCU controller 7.

The rotating speed sensor 8 is used for connecting an output shaft of the AMT transmission 1, the lower limit photoelectric sensor 3 and the upper limit photoelectric sensor 4 are installed on a shell of the AMT transmission, the upper limit photoelectric sensor 4 is installed at the upper limit position of the normal lubricating oil liquid level, and the lower limit photoelectric sensor 3 is installed at the lower limit position of the lubricating oil liquid level.

The rotating speed sensor 8, the lower limit photoelectric sensor 3 and the upper limit photoelectric sensor 4 are all connected with a VCU controller, and the VCU controller is connected with a TCU controller.

The speed sensor 8 is used for measuring the rotating speed of an output shaft of the gearbox, the lower limit photoelectric sensor 3 and the upper limit photoelectric sensor 4 are used for monitoring the position of lubricating oil in the gearbox, the VCU controller is used for receiving information measured by the sensors and sending the received information to the TCU controller, and the TCU controller outputs an alarm signal according to the rotating speed information and the liquid level information and sends power control information of the gearbox to the TCU controller.

The top of AMT derailleur casing is provided with oil filler hole 2 and oil drain hole 5.

When oil is normal, the oil immerses a lower limit photoelectric position sensor, the signal of the lower limit photoelectric position sensor is a high resistance signal, the upper limit position sensor is not immersed in the oil, and the upper limit position sensor outputs a low resistance signal;

when the oil is too low, both sensors are not immersed in the oil, and the signals are low-resistance signals.

When the oil is excessive, the two sensors are immersed in the oil, and signals are high-resistance signals.

Signals of the photoelectric sensors are connected into the TCU controller through a hard wire, a low resistance signal is a logic value 0, a high resistance signal is a logic value 1, the TCU controller makes a logic judgment according to a signal addition value of the upper limit photoelectric sensor and the lower limit photoelectric sensor, when the value is 0 or 2, the oil is insufficient, a transmission oil insufficiency signal is sent through a whole vehicle CAN message to be arranged on a vehicle instrument panel, an indicator light for indicating that the transmission oil is insufficient is lightened by the instrument panel, and a 400 hotline telephone for 24-hour maintenance of a transmission manufacturer is displayed in an instrument submenu.

According to the AMT maintenance method based on the pure electric commercial vehicle, the maintenance information of the AMT of the pure electric commercial vehicle is correctly and effectively transmitted to a user through the photoelectric position sensor, the output shaft rotating speed sensor, the VCU controller, the TCU controller and the instrument panel, the maintenance information of the AMT is timely maintained under the condition that the time is buffered by the user, the user contacts a service maintenance worker through a hot-line telephone for 24-hour maintenance 400 displayed by a vehicle instrument sub-menu, and the vehicle is driven to a nearby maintenance service station for maintenance. The method avoids unnecessary economic loss of customers caused by leakage protection, and simultaneously reduces the failure rate of the AMT transmission.

Traditional commercial car derailleur only has the mechanical body, does not have the derailleur controller, and new forms of energy commercial car AMT derailleur when providing the mechanical body, has still integrateed the TCU controller, consequently provides technical support at AMT derailleur maintenance suggestion control system, and meanwhile, photoelectric position sensor's wide application also provides technical guarantee for AMT derailleur maintenance suggestion detecting system.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.