WO2024001715A1

WO2024001715A1 - Electric vehicle power system torque determination method and apparatus, controller, and medium

Info

Publication number: WO2024001715A1
Application number: PCT/CN2023/099214
Authority: WO
Inventors: 伍庆龙
Original assignee: 中国第一汽车股份有限公司
Priority date: 2022-07-01
Filing date: 2023-06-08
Publication date: 2024-01-04
Also published as: CN115009033A

Abstract

An electric vehicle power system torque determination method and apparatus, a controller, and a medium. The electric vehicle power system torque determination method comprises: determining maximum allowable driving power of a motor (101) of an electric vehicle; determining maximum allowable discharge power of a battery (103) of the electric vehicle; determining maximum allowable driving power of a power system of the electric vehicle according to the maximum allowable driving power of the motor (101) and the maximum allowable discharge power of the battery (103); and determining maximum allowable driving torque of the power system of the electric vehicle on the basis of the maximum allowable driving power of the power system and a rotational speed of the current motor (101).

Description

Electric vehicle power system torque determination method, device, controller and medium

This application claims priority to the Chinese patent application with application number 202210774572.X, which was submitted to the China Patent Office on July 1, 2022. The entire content of the above application is incorporated into this application by reference.

Technical field

The embodiments of the present application relate to the technical field of new energy vehicles, for example, to a method, device, controller and medium for determining the torque of an electric vehicle power system.

Background technique

As we all know, new energy electric vehicles provide electric energy to the motor through the power battery, which not only ensures efficient driving output of the entire vehicle, but also allows effective energy recovery during the taxiing and braking stages, ultimately achieving the goal of energy saving and emission reduction for the entire vehicle. .

Contents of the invention

Embodiments of the present application provide a torque determination method, device, controller and medium for an electric vehicle power system.

In a first aspect, embodiments of the present application provide a method for determining torque of an electric vehicle power system, including:

Determine the maximum allowable driving power of the motor of the electric vehicle;

Determine the maximum allowable discharge power of the battery of the electric vehicle;

Determine the maximum allowable drive power of the power system of the electric vehicle based on the maximum allowable drive power of the motor and the maximum allowable discharge power of the battery;

Based on the maximum allowable driving power of the power system and the current motor speed, the maximum allowable driving torque of the power system of the electric vehicle is determined.

In a second aspect, embodiments of the present application provide a torque determination device for an electric vehicle power system, including:

A first determination module configured to determine the maximum allowable driving power of the motor of the electric vehicle;

a second determination module configured to determine the maximum allowable discharge power of the battery of the electric vehicle;

A third determination module, configured to determine the maximum allowable drive power of the power system of the electric vehicle based on the maximum allowable drive power of the motor and the maximum allowable discharge power of the battery;

The fourth determination module is configured to determine the maximum allowable driving torque of the power system of the electric vehicle based on the maximum allowable driving power of the power system and the current motor speed.

In a third aspect, embodiments of the present application provide a vehicle controller, which includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the implementation of the present application is implemented. The first aspect of the embodiment provides the steps of the method for determining the torque of an electric vehicle power system.

In a fourth aspect, embodiments of the present application further provide a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the method for determining torque of an electric vehicle power system provided in the first aspect of the embodiment of the present application is implemented. A step of.

Description of drawings

Figure 1 is a structural schematic diagram of the power system of an electric vehicle to which the embodiment of the present application is applicable;

Figure 2 is a schematic flowchart of a method for determining the torque of an electric vehicle power system provided by an embodiment of the present application;

Figure 3 is another schematic flowchart of a method for determining the torque of an electric vehicle power system provided by an embodiment of the present application;

Figure 4 is a schematic structural diagram of an electric vehicle power system torque determination device provided by an embodiment of the present application;

Figure 5 is a schematic structural diagram of a vehicle controller provided by an embodiment of the present application.

Detailed ways

The comprehensive torque capability of the electric vehicle power system is an important factor affecting the driving and energy recovery of the entire vehicle. In other words, accurately and effectively evaluating the maximum driving torque capability and maximum recovery torque capability of the electric vehicle power system is crucial to the overall development of the electric vehicle. Vehicle drive control and capacity recovery control have important data reference value and can ensure the reliability and stability of electric vehicle operation. Therefore, how to accurately and effectively calculate the torque capacity of the electric vehicle power system is an urgent problem.

Considering the above situation, embodiments of the present application disclose a torque determination method, device, controller and medium for an electric vehicle power system.

The present application will be described below in conjunction with the drawings and embodiments. It can be understood that the embodiments described here are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for convenience of description, only some but not all structures related to the present application are shown in the drawings.

The embodiments of the present application will be further described through the following embodiments in conjunction with the accompanying drawings. It should be understood that the embodiments described here are only used to explain the present application and are not used to limit the present application.

It should be noted that the execution subject of the following method embodiments may be an electric vehicle power system torque determination device, which may be implemented as part or all of the vehicle controller through software, hardware, or a combination of software and hardware. For example, the vehicle controller may be a vehicle controller or a motor controller. The following method embodiments are described by taking the execution subject being a vehicle controller as an example.

FIG. 1 is a schematic structural diagram of a power system of an electric vehicle to which embodiments of the present application are applicable. As shown in Figure 1, the power system may include a drive motor 101 (hereinafter referred to as the motor), an inverter 102, a power battery 103, a DC converter 104, a gearbox 105, a reducer 106, a drive shaft 107, an air conditioning system 108, etc. , each component is controlled by its corresponding controller. For example, the motor controller is used to control the motor, the battery management system is used to control the power battery, the transmission controller is used to control vehicle shifting, the air conditioning system is used to control the air conditioning switch, etc. Different controllers can be connected through the controller area network (Controller Area Network). Area Network, CAN) network signals for communication. The embodiments of this application are intended to determine the maximum driving torque and maximum recovery torque that the power system of an electric vehicle can support.

Next, let’s first introduce how to determine the maximum driving torque that the electric vehicle’s power system can support.

Figure 2 is a schematic flowchart of a method for determining the torque of an electric vehicle power system provided by an embodiment of the present application. As shown in Figure 2, the method may include:

S201. Determine the maximum allowable driving power of the motor of the electric vehicle.

Among them, the maximum allowable driving power of the motor refers to the maximum driving power that the motor can output. Factors such as the motor's climbing power characteristics, current motor speed, and motor operating status (such as motor body temperature, inverter temperature) may affect the maximum allowable driving power of the electric vehicle's motor. Therefore, the maximum allowable driving power of the electric vehicle's motor can be determined from multiple aspects such as the motor's climbing power characteristics, current motor speed, and motor operating status.

For example, the vehicle controller may refer to the following S2011-S2015 process to determine the maximum allowable driving power of the motor of the electric vehicle:

S2011. Determine the maximum driving torque of the first motor that meets the vehicle's climbing characteristic requirements.

Assuming that the maximum grade of the vehicle is α _max (for example, 20 degrees, which can be calibrated), the motor driving torque T _m that meets the target requirement of the maximum grade of the vehicle is calculated through the following formula 1 or a variation of formula 1.

Formula 1:

Among them, i _g is the gearbox speed ratio, i _o is the main reducer speed ratio, eta _T is the drive train efficiency, r is the wheel radius, m is the mass of the battery car, f is the rolling resistance coefficient, and C is the air resistance coefficient, A is the windward area, δ is the rotational mass conversion coefficient of the electric vehicle, v is the vehicle speed, and g is the gravity acceleration.

In order to enable the vehicle to start on a hill when it is stationary at the maximum climbing angle, a certain torque increment needs to be reserved on the basis of the above motor driving torque. Based on the above motor driving torque and torque increment and get the maximum driving torque of the first motor that is suitable for the vehicle's climbing characteristics.

S2012. Determine the maximum driving torque of the second motor allowed at the current motor speed.

Among them, the current motor speed is obtained, and the preset first motor speed-torque-efficiency curve is queried based on the current motor speed, and the second motor maximum driving torque and motor efficiency η _m corresponding to the current motor speed can be obtained.

S2013. Determine the maximum driving torque of the third motor allowed under the motor operating temperature.

Among them, the vehicle controller can estimate the maximum driving torque of the third motor allowed under the motor operating temperature in real time based on the motor operating status, the motor body temperature correction coefficient and the inverter temperature correction coefficient.

S2014. Determine the minimum value among the maximum driving torque of the first motor, the maximum driving torque of the second motor, and the maximum driving torque of the third motor as the maximum allowable driving torque of the motor of the electric vehicle.

Among them, the maximum allowable driving torque of the motor is the final determined maximum driving torque that the motor can output. After obtaining the maximum driving torque of the first motor, the maximum driving torque of the second motor and the maximum driving torque of the third motor, the minimum value of the maximum driving torque of the first motor, the maximum driving torque of the second motor and the maximum driving torque of the third motor is determined. It is the maximum allowable driving torque of the electric vehicle motor.

S2015. Determine the maximum allowable driving power of the motor based on the maximum allowable driving torque of the motor, the current motor speed and the motor efficiency.

After obtaining the maximum allowable driving torque of the motor, the current motor speed and the motor efficiency, the maximum allowable driving power P _Drv of the motor can be determined through the following formula 2 or a variation of formula 2.

Formula 2:

Among them, n is the current motor speed, T _Drv is the maximum allowable driving torque of the motor, and eta _m is the motor efficiency.

S202. Determine the maximum allowable discharge power of the battery of the electric vehicle.

Among them, the maximum allowable discharge power of the battery refers to the maximum discharge power that the battery can output. Factors such as the driving characteristics of electric vehicles, the actual discharge power of the battery, and the power consumption of accessory appliances in electric vehicles may all affect the maximum discharge power of the battery of electric vehicles. Therefore, the maximum allowable discharge power of the battery of an electric vehicle can be determined from many aspects such as the driving characteristics of the electric vehicle, the actual discharge power of the battery, and the power consumption of the accessory appliances in the electric vehicle.

For example, the vehicle controller may refer to the following S2021-S2024 process to determine the maximum allowable discharge power of the motor of the electric vehicle:

S2021. Determine the maximum discharge power of the first battery that meets the needs of the entire vehicle.

Among them, by introducing the battery efficiency eta _b , and then determining the maximum discharge power of the first battery that meets the needs of the entire vehicle through the following formula 3 or a variation of formula 3 The above battery efficiency eta _b can be obtained through the battery management system or through the battery characteristic curve.

Formula 3:

Among them, eta _T is the drive train efficiency, r is the wheel radius, m is the mass of the battery car, f is the rolling resistance coefficient, C is the air resistance coefficient, A is the windward area, α is the road gradient, and δ is the rotational mass conversion of the electric vehicle. Coefficient, v is the vehicle speed, and g is the acceleration due to gravity.

S2022. Determine the maximum discharge power of the second battery at the current moment through the voltage signal and current signal on the network.

Among them, the vehicle controller calculates the maximum discharge power of the second battery at the current moment through the following formula 4 or a variation of formula 4 according to the voltage signal and current signal sent to the CAN network by the battery management system.

Formula 4:

Among them, U is the voltage signal and I is the current signal.

S2023. Obtain the power consumption of the accessory appliances of the electric vehicle.

S2024. Determine the maximum allowable discharge power of the battery of the electric vehicle based on the maximum discharge power of the first battery, the maximum discharge power and the power consumption of the second battery.

Among them, after obtaining the maximum discharge power of the first battery, the maximum discharge power and the power consumption of the second battery, the maximum allowable battery of the electric vehicle can be determined by comprehensively considering the maximum discharge power of the first battery, the maximum discharge power and power consumption of the second battery. Discharge power. For example, the maximum allowable battery discharge power of the electric vehicle can be obtained by taking the difference between the maximum value of the maximum discharge power of the first battery and the maximum discharge power of the second battery and the power consumption of the accessory appliance.

This embodiment comprehensively determines the maximum allowable discharge power of the battery of the electric vehicle through multiple factors, fully considering the power consumption of the accessory appliances and the driving characteristics of the electric vehicle, so that the maximum allowable discharge power of the battery is more in line with the actual situation and improves the estimation accuracy of results.

S203. Determine the maximum allowable driving power of the power system of the electric vehicle based on the maximum allowable driving power of the motor and the maximum allowable discharge power of the battery.

Among them, after obtaining the maximum allowable driving power of the motor and the maximum allowable discharge power of the battery, the minimum value of the maximum allowable driving power of the motor and the maximum allowable discharge power of the battery can be determined as the maximum allowable driving power of the power system of the electric vehicle.

S204. Based on the maximum allowable driving power of the power system and the current motor speed, determine the motor speed. The maximum allowable driving torque of the power system of the electric vehicle.

After obtaining the maximum allowable driving power of the electric vehicle's power system, the maximum allowable driving torque T _sysDrg of the electric vehicle's power system can be determined through the following formula 5 or a variation of formula 5.

Formula 5: T _sysDrg =P _sysDrg ÷n*9549;

Among them, P _sysDrg is the maximum allowable driving power of the electric vehicle's power system, and n is the current motor speed.

The method for determining the torque of the electric vehicle power system provided by the embodiment of the present application determines the maximum allowable driving power of the motor and the maximum allowable discharge power of the battery respectively, and determines the power system of the electric vehicle based on the maximum allowable driving power of the motor and the maximum allowable discharge power of the battery. The maximum allowable driving power is based on the maximum allowable driving power of the electric vehicle's power system and the current motor speed. The maximum allowable driving torque of the electric vehicle's power system is determined, taking into account the maximum allowable driving power that the motor can output and the maximum allowable discharge that the battery can output. Power, taking into account comprehensive factors, improves the accuracy of the calculation results of the maximum driving torque capacity of the entire power system, thereby providing a true and reliable source of torque value for the driver's driving torque needs.

Next, continue to introduce how to determine the maximum regenerative torque that the power system of an electric vehicle can support. For example, as shown in Figure 3, the method may also include:

S301. Determine the maximum allowable recovery power of the motor of the electric vehicle.

Among them, the maximum allowable recovery power of the motor refers to the maximum recovery power that the motor can support. Factors such as the motor's braking system characteristics, current motor speed, and motor operating status (such as motor body temperature, inverter temperature) may affect the maximum allowable recovery power of the electric vehicle's motor. Therefore, the maximum allowable recuperated power of the electric vehicle's motor can be determined from multiple aspects such as the motor's braking system characteristics, current motor speed, and motor operating status.

In an example, the vehicle controller may refer to the following process of S3011-S3015 to determine the maximum allowable recovery power of the motor of the electric vehicle:

S3011. Determine the maximum recovery torque of the first motor allowed under the vehicle's maximum deceleration.

Among them, assuming that the maximum deceleration of the vehicle braking system is α _brk (the maximum deceleration can be calibrated), the vehicle controller can determine the maximum regenerative torque of the first motor through the following formula 6 or a variation of formula 6

Formula 6:

Among them, i _g is the gearbox speed ratio, i _o is the main reducer speed ratio, eta _T is the drive train efficiency, r is the wheel radius, and m is the mass of the battery car.

S3012. Determine the maximum recovery torque of the second motor allowed under the current motor speed.

Among them, the current motor speed is obtained, and the preset second motor speed-torque-efficiency curve is queried based on the current motor speed, and the second motor maximum regenerative torque T _R ² _ec and motor efficiency η _m corresponding to the current motor speed can be obtained.

S3013. Determine the maximum recovery torque of the third motor allowed under the motor operating temperature.

Among them, the vehicle controller can estimate the maximum recuperation torque of the third motor allowed under the motor operating temperature in real time based on the motor operating status, the motor body temperature correction coefficient and the inverter temperature correction coefficient.

S3014. Determine the maximum value among the maximum recuperation torque of the first motor, the maximum recuperation torque of the second motor, and the maximum recuperation torque of the third motor as the maximum allowable recuperation torque of the motor of the electric vehicle.

Among them, the vehicle controller passes the above as well as Take the maximum value operation and determine the maximum value obtained as the maximum allowable recuperation torque of the motor of the electric vehicle.

S3015: Determine the maximum allowable recovery power of the motor based on the maximum allowable recovery torque of the motor, the current motor speed and the motor efficiency.

After obtaining the maximum allowable recovery torque of the motor After the current motor speed n and the motor efficiency η _m , the maximum allowable recuperated power P _Rec of the motor can be determined through the following formula 7 or a variation of formula 7.

Formula 7:

S302. Determine the maximum allowable charging power of the battery of the electric vehicle.

Among them, the maximum allowable charging power of the battery refers to the maximum charging power that the battery can support. Factors such as the driving characteristics of electric vehicles, the actual charging power of the battery, and the power consumption of accessory appliances in electric vehicles may all affect the maximum charging power of the battery of electric vehicles. Therefore, the maximum allowable charging power of the battery of an electric vehicle can be determined from many aspects such as the driving characteristics of the electric vehicle, the actual charging power of the battery, and the power consumption of the accessory appliances in the electric vehicle.

For example, the vehicle controller may refer to the following S3021-S3023 process to determine the maximum allowable charging power of the motor of the electric vehicle:

S3021. Determine the maximum charging power of the first battery corresponding to the vehicle braking characteristics.

Among them, it is assumed that during the driving of the electric vehicle, the braking recuperation energy of the braking system is determined based on the vehicle braking parameters, and then the braking recuperation energy is converted into braking recuperation power. Based on the braking recuperation efficiency and braking recuperation power, the first The maximum charging power of a battery.

The above vehicle braking parameters may include braking start time, braking end time, braking starting speed, braking duration, braking deceleration, etc. For example, the vehicle controller may be based on Equation 8 or Equation 8 The variant determines the braking regenerative energy E of the braking system.

Formula 8:

Among them, t1 is the braking start time, t2 is the braking end time, v ₁ is the braking starting speed, a is the braking deceleration, and t is the braking duration.

After obtaining the braking recovery energy E, divide E by 3600 to obtain the braking recovery power. The product of the braking recovery power and the braking recovery efficiency is determined as the maximum charging power of the first battery.

S3022. Determine the maximum charging power of the second battery allowed under the current battery temperature.

Among them, the preset battery charging characteristic curve is queried according to the current battery temperature, and the maximum charging power of the second battery allowed under the current battery temperature is obtained.

S3023. Sum the maximum value of the maximum charging power of the first battery and the maximum charging power of the second battery with the power consumption of the accessory appliances of the electric vehicle to obtain the maximum allowable charging power of the battery of the electric vehicle.

S303. Determine the maximum allowable recovery power of the power system of the electric vehicle based on the maximum allowable recovery power of the motor and the maximum allowable charging power of the battery.

Among them, after obtaining the maximum allowable recovery power of the motor and the maximum allowable charging power of the battery, the maximum value of the maximum allowable recovery power of the motor and the maximum allowable charging power of the battery can be determined as the maximum allowable recovery power of the power system of the electric vehicle.

This embodiment uses multiple factors to comprehensively determine the maximum allowable charging power of the battery of the electric vehicle, fully considering the power consumption of the accessory appliances and the driving characteristics of the electric vehicle, so that the obtained maximum allowable charging power of the battery is more in line with the actual situation and improves the estimation accuracy of results.

S304. Determine the maximum allowable recovery torque of the power system of the electric vehicle based on the maximum allowable recovery power of the power system and the current motor speed.

After obtaining the maximum allowable recuperation power of the electric vehicle's power system, the maximum allowable recuperation torque T _sysRec of the electric vehicle's power system can be determined through the following formula 9 or a variation of formula 9.

Formula 9: T _sysRec =P _sysRec ÷n*9549;

Among them, P _sysRec is the maximum allowable driving power of the electric vehicle's power system, and n is the current motor speed.

In this embodiment, the vehicle controller determines the maximum allowable recovery power of the electric vehicle's motor and the maximum allowable charging power of the battery, and determines the maximum allowable recovery power of the power system of the electric vehicle based on the maximum allowable recovery power of the motor and the maximum allowable charging power of the battery, Based on the maximum allowable recovery power of the electric vehicle's power system and the current motor speed, the maximum allowable recovery torque of the electric vehicle's power system is determined, taking into account the maximum allowable recovery power that the motor can support and the maximum allowable charge that the battery can support. Electric power, comprehensive consideration, improves the accuracy of the calculation results of the entire power system's maximum torque recovery capability, thereby providing a true and reliable source of torque value for vehicle energy recovery.

Figure 4 is a schematic structural diagram of a torque determination device for an electric vehicle power system provided by an embodiment of the present application. As shown in FIG. 4 , the device may include: a first determination module 401 , a second determination module 402 , a third determination module 403 and a fourth determination module 404 .

The first determination module 401 is configured to determine the maximum allowable driving power of the motor of the electric vehicle;

The second determination module 402 is configured to determine the maximum allowable discharge power of the battery of the electric vehicle;

The third determination module 403 is configured to determine the maximum allowable driving power of the power system of the electric vehicle based on the maximum allowable driving power of the motor and the maximum allowable discharge power of the battery;

The fourth determination module 404 is configured to determine the maximum allowable driving torque of the power system of the electric vehicle based on the maximum allowable driving power of the power system and the current motor speed.

The electric vehicle power system torque determination device provided by this application determines the maximum allowable driving power of the motor of the electric vehicle and the maximum allowable discharge power of the battery, and determines the maximum allowable power system of the electric vehicle based on the maximum allowable driving power of the motor and the maximum allowable discharge power of the battery. Driving power, based on the maximum allowable drive power of the electric vehicle's power system and the current motor speed, determines the maximum allowable drive torque of the electric vehicle's power system, taking into account the maximum allowable drive power that the motor can output and the maximum allowable discharge power that the battery can output, Comprehensive considerations improve the accuracy of the calculation results of the maximum driving torque capacity of the entire power system, thereby providing a true and reliable source of torque value for the driver's driving torque needs.

Based on the above embodiment, in one embodiment, the first determination module 401 is configured to determine the maximum driving torque of the first motor that meets the vehicle's climbing characteristic requirements; determine the maximum driving torque of the second motor allowed at the current motor speed; Determine the maximum driving torque of the third motor allowed under the operating temperature of the motor; determine the minimum value among the maximum driving torque of the first motor, the maximum driving torque of the second motor and the maximum driving torque of the third motor as the maximum driving torque of the electric vehicle. Allowable driving torque; determine the maximum allowable driving power of the motor based on the maximum allowable driving torque of the motor, the current motor speed and the motor efficiency.

Based on the above embodiment, in one embodiment, the second determination module 402 includes:

The first determination unit is configured to determine the maximum discharge power of the first battery that meets the needs of the entire vehicle;

The second determination unit is configured to determine the maximum discharge power of the second battery at the current moment through the voltage signal and current signal on the network;

The acquisition unit is configured to acquire the power consumption of the accessory appliances of the electric vehicle;

The third determination unit is configured to determine the maximum allowable discharge power of the battery of the electric vehicle based on the maximum discharge power of the first battery, the maximum discharge power and the power consumption of the second battery.

Based on the above embodiment, in one embodiment, the third determination unit is configured to make a difference between the maximum value of the maximum discharge power of the first battery and the maximum discharge power of the second battery and the consumed power, Obtain the maximum allowable discharge power of the battery of the electric vehicle.

Based on the above embodiment, in one embodiment, the device further includes: a fifth determination module, a sixth determination module, a seventh determination module and an eighth determination module.

The fifth determination module is configured to determine the maximum allowable recovery power of the motor of the electric vehicle;

The sixth determination module is configured to determine the maximum allowable charging power of the battery of the electric vehicle;

A seventh determination module is configured to determine the maximum allowable recovery power of the power system of the electric vehicle based on the maximum allowable recovery power of the motor and the maximum allowable charging power of the battery;

The eighth determination module is configured to determine the maximum allowable recuperation torque of the power system of the electric vehicle based on the maximum allowable recuperation power of the power system and the current motor speed.

Based on the above embodiment, in one embodiment, the fifth determination module is configured to determine the maximum recuperation torque of the first motor allowed under the maximum deceleration of the vehicle; determine the maximum recuperation torque of the second motor allowed under the current motor speed; determine The maximum recuperation torque of the third motor allowed under the operating temperature of the motor; the maximum value among the maximum recuperation torque of the first motor, the maximum recuperation torque of the second motor and the maximum recuperation torque of the third motor is determined as the maximum allowable motor of the electric vehicle Recuperation torque; determine the maximum allowable recuperation power of the motor based on the maximum allowable recuperation torque of the motor, the current motor speed and the motor efficiency.

Based on the above embodiment, in one embodiment, the sixth determination module is configured to determine the maximum charging power of the first battery corresponding to the vehicle braking characteristics; determine the maximum charging power of the second battery allowed under the current battery temperature; The maximum allowable charging power of the battery of the electric vehicle is obtained by summing the maximum value of the maximum charging power of the first battery and the maximum charging power of the second battery with the power consumption of the accessory appliances of the electric vehicle.

In one embodiment, a vehicle controller is provided, the internal structure diagram of which can be shown in Figure 5 . The vehicle controller may include a processor 50, a memory 51, an input device 52 and an output device 53; the number of processors 50 in the vehicle controller may be one or more, with one processor 50 being taken as an example in Figure 5; Vehicle Control The processor 50, memory 51, input device 52 and output device 53 in the device can be connected through a bus or other means. In Figure 5, connection through a bus is taken as an example.

As a computer-readable storage medium, the memory 51 can be used to store software programs, computer-executable programs and modules, such as program instructions/modules corresponding to the electric vehicle power system torque determination method in the embodiments of the present application (for example, electric vehicle power system The first determination module 401, the second determination module 402, the third determination module 403 and the fourth determination module 404) in the system torque determination device. The processor 50 executes various functions of the vehicle controller by running software programs, instructions and modules stored in the memory 51 Functional application and data processing are to implement the above-mentioned torque determination method of the electric vehicle power system.

The memory 51 may mainly include a stored program area and a stored data area, where the stored program area may store an operating system and an application program required for at least one function; the stored data area may store data created according to the use of the vehicle controller, etc. In addition, the memory 51 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, the memory 51 may further include memory located remotely relative to the processor 50, and these remote memories may be connected to the device/terminal/server through a network. Examples of the above-mentioned networks include but are not limited to the Internet, intranets, local area networks, mobile communication networks and combinations thereof.

The input device 52 may be used to receive input of numeric or character information and to generate key signal inputs related to user settings and function control of the vehicle controller. The output device 53 may include a display device such as a display screen.

Embodiments of the present application also provide a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform a method for determining torque of an electric vehicle power system, which method includes:

The embodiments of the present application provide a storage medium containing computer-executable instructions. The computer-executable instructions are not limited to the method operations described above, and can also execute the method for determining the torque of an electric vehicle power system provided by any embodiment of the present application. related operations.

The storage medium may be a non-transitory storage medium.

Through the above description of the implementation manner, those skilled in the art can clearly understand that the present application can be implemented with the help of software and necessary general hardware, or can also be implemented by hardware. Based on this understanding, the embodiments of the present application can be embodied in the form of software products in essence or those that contribute to related technologies. The computer software products can be stored in computer-readable storage media, such as computer floppy disks, Read-Only Memory (ROM), Random Access Memory (RAM), FLASH, hard disk or optical disk, etc., including a number of instructions to make a computer device (which can be a personal computer, Server, or network equipment, etc.) Perform the methods described in various embodiments of this application.

It is worth noting that in the above embodiments of the search device, the various units and modules included are only divided according to functional logic, but are not limited to the above divisions, as long as the corresponding functions can be realized; in addition, each function The names of the units are only for the convenience of distinguishing each other and are not used to limit the protection scope of the present application.

Those skilled in the art will understand that the present application is not limited to the specific embodiments described here, and that various changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described through the above embodiments, the present application is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by The scope of the appended claims is determined.

Claims

A method for determining torque of an electric vehicle power system, including:

Determine the maximum allowable driving power of the motor of the electric vehicle;

Determine the maximum allowable discharge power of the battery of the electric vehicle;

Determine the maximum allowable drive power of the power system of the electric vehicle based on the maximum allowable drive power of the motor and the maximum allowable discharge power of the battery;

Based on the maximum allowable driving power of the power system and the current motor speed, the maximum allowable driving torque of the power system of the electric vehicle is determined.
The method according to claim 1, wherein determining the maximum allowable driving power of the motor of the electric vehicle includes:

Determine the maximum driving torque of the first motor that meets the vehicle's climbing characteristics requirements;

Determine the maximum driving torque of the second motor allowed at the current motor speed;

Determine the maximum drive torque of the third motor allowed at the motor operating temperature;

Determine the minimum value among the maximum driving torque of the first motor, the maximum driving torque of the second motor and the maximum driving torque of the third motor as the maximum allowable driving torque of the motor of the electric vehicle;

Based on the maximum allowable driving torque of the motor, the current motor speed and the motor efficiency, the maximum allowable driving power of the motor is determined.
The method according to claim 1, wherein determining the maximum allowable discharge power of the battery of the electric vehicle includes:

Determine the maximum discharge power of the first battery that meets the needs of the entire vehicle;

Determine the maximum discharge power of the second battery at the current moment through the voltage signal and current signal on the network;

Obtain the power consumption of the accessory appliances of the electric vehicle;

The maximum allowable battery discharge power of the electric vehicle is determined based on the maximum discharge power of the first battery, the maximum discharge power and the power consumption of the second battery.
The method according to claim 3, wherein determining the maximum allowable discharge power of the battery of the electric vehicle based on the maximum discharge power of the first battery, the maximum discharge power and consumption power of the second battery includes: The maximum allowable discharge power of the battery of the electric vehicle is obtained by taking the difference between the maximum value of the maximum discharge power of the first battery and the maximum discharge power of the second battery and the consumed power.
The method of claim 1, further comprising:

Determine the maximum allowable recovered power of the motor of the electric vehicle;

Determine the maximum allowable charging power of the battery of the electric vehicle;

According to the maximum allowable recovery power of the motor and the maximum allowable charging power of the battery, the The maximum allowable power recovery of the power system of an electric vehicle;

Based on the maximum allowable recuperated power of the power system and the current motor speed, the maximum allowable recuperated torque of the power system of the electric vehicle is determined.
The method according to claim 5, wherein determining the maximum allowable recovery power of the motor of the electric vehicle includes:

Determine the maximum recuperation torque of the first motor allowed under the maximum deceleration of the vehicle;

Determine the maximum recuperation torque of the second motor allowed at the current motor speed;

Determine the maximum recuperation torque of the third motor allowed at the motor operating temperature;

Determine the maximum value among the maximum recuperation torque of the first motor, the maximum recuperation torque of the second motor and the maximum recuperation torque of the third motor as the maximum allowable recuperation torque of the motor of the electric vehicle;

Based on the maximum allowable recovery torque of the motor, the current motor speed and the motor efficiency, the maximum allowable recovery power of the motor is determined.
The method of claim 5, wherein determining the maximum allowable charging power of the battery of the electric vehicle includes:

Determine the maximum charging power of the first battery corresponding to the vehicle braking characteristics;

Determine the maximum charging power of the second battery allowed at the current battery temperature;

The maximum allowable charging power of the battery of the electric vehicle is obtained by summing the maximum value of the maximum charging power of the first battery and the maximum charging power of the second battery with the power consumption of the accessory appliances of the electric vehicle.
A torque determination device for an electric vehicle power system, including:

A first determination module configured to determine the maximum allowable driving power of the motor of the electric vehicle;

a second determination module configured to determine the maximum allowable discharge power of the battery of the electric vehicle;

A third determination module configured to determine the maximum allowable drive power of the power system of the electric vehicle based on the maximum allowable drive power of the motor and the maximum allowable discharge power of the battery;

The fourth determination module is configured to determine the maximum allowable driving torque of the power system of the electric vehicle based on the maximum allowable driving power of the power system and the current motor speed.
A vehicle controller includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.
A computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.