CN-116252639-B - Vehicle torque control method, vehicle controller, and readable storage medium

CN116252639BCN 116252639 BCN116252639 BCN 116252639BCN-116252639-B

Abstract

The invention discloses a control method of vehicle torque, a vehicle controller and a readable storage medium, wherein the method comprises the steps of determining the required torque of a wheel end of a vehicle according to vehicle state information; the method comprises the steps of setting a plurality of torque distribution ratios, calculating motor demand torque of each electric driving system under each torque distribution ratio according to wheel end demand torque, calculating estimated power consumption of each electric driving system according to motor demand torque of each electric driving system and corresponding driving information, obtaining first total estimated power consumption of all electric driving systems corresponding to each torque distribution ratio, and determining a target torque distribution ratio according to all first total estimated power consumption. The embodiment of the invention realizes low power consumption of the electric drive system, and the target torque distribution ratio is a better torque distribution ratio determined based on the actual running state of the vehicle and the power consumption of the electric drive system in the running process of the vehicle, so that the efficiency of the electric drive system and the economy of the electric drive system are improved.

Inventors

Shan Mingyuan

Assignees

广东汇天航空航天科技有限公司

Dates

Publication Date: 20260508
Application Date: 20230420

Claims (12)

1. A control method of vehicle torque, characterized by comprising the steps of: determining a vehicle wheel end required torque according to the vehicle state information; Setting a plurality of torque distribution ratios, and calculating the motor required torque of each electric drive system under each torque distribution ratio according to the wheel end required torque; calculating the estimated consumption power of each electric drive system according to the motor required torque of each electric drive system and the corresponding drive information, and obtaining the first total estimated consumption power of all the electric drive systems corresponding to each torque distribution ratio; Determining a target torque distribution ratio based on all of the first total predicted power consumption; the step of determining a target torque distribution ratio from all of the first total predicted power consumption includes: obtaining the minimum target total predicted power consumption from all the first total predicted power consumption, and taking the calculated torque distribution ratio of the target total predicted power consumption as a first torque distribution ratio; calculating motor required torque of each electric drive system according to the first torque distribution ratio and the wheel end required torque; calculating a second total estimated power consumption of all of the electric drive systems based on the motor demand torque of each electric drive system and the corresponding drive information, wherein the second total estimated power consumption is determined based on a first estimated power consumption determined based on an electric drive system having a motor demand torque other than zero and a second estimated power consumption determined based on an electric drive system having a motor demand torque of zero; and updating the first torque distribution ratio according to the second total expected consumed power and the limiting power of the energy end, and taking the updated first torque distribution ratio as the target torque distribution ratio.
2. The method of controlling vehicle torque according to claim 1, wherein the step of setting a plurality of torque distribution ratios, calculating motor demand torque for each of the electric drive systems from the wheel end demand torque, includes: Setting a plurality of torque distribution ratios, and adjusting each torque distribution ratio according to the maximum torque boundary fed back by each electric drive system; And calculating the motor required torque of each electric drive system under each adjusted torque distribution ratio according to the wheel end required torque.
3. The method of controlling vehicle torque according to claim 1, wherein the step of determining a target torque distribution ratio based on all of the first total estimated consumed power includes: Determining a first torque distribution ratio based on all of the first total predicted power consumption; Acquiring a maximum torque boundary fed back by each electric drive system, and adjusting the first torque distribution ratio based on the maximum torque boundary; and determining the adjusted first torque distribution ratio as a target torque distribution ratio.
4. A control method of vehicle torque according to any one of claims 1 to 3, wherein the step of calculating motor demand torque of each of the electric drive systems corresponding to the torque distribution ratio from the wheel end demand torque includes: And calculating the motor required torque of each electric drive system according to the wheel end required torque, the torque distribution ratio, the speed ratio and the speed reducer efficiency.
5. A control method of a vehicle torque as set forth in any one of claims 1 to 3, characterized in that said step of determining a target torque distribution ratio from all of said first total estimated consumption power includes: obtaining the minimum target total predicted power consumption from all the first total predicted power consumption; and taking the calculated torque distribution ratio of the target total predicted consumed power as a target torque distribution ratio.
6. The method of controlling vehicle torque according to claim 1, wherein the step of updating the first torque distribution ratio in accordance with the second total predicted power consumption and the limit power at the energy end includes: Comparing the second total predicted power consumption with the limited power at the energy end; if the second total predicted power consumption is less than or equal to the limit power, taking the first torque distribution ratio as a target torque distribution ratio; And if the second total predicted power consumption is greater than the limiting power, reducing the wheel end required torque, and returning to the step of calculating the motor required torque of each electric drive system under each torque distribution ratio according to the wheel end required torque so as to update the first torque distribution ratio.
7. The method of controlling vehicle torque according to claim 1, wherein the drive information includes at least one of an electric drive system rotational speed, an electric drive system efficiency, and a power loss of the electric drive system to maintain 0 torque.
8. A control method of vehicle torque, characterized by comprising the steps of: determining a vehicle wheel end required torque according to the vehicle state information; determining a first torque distribution ratio of the vehicle, wherein the first torque distribution ratio is a torque distribution ratio corresponding to a minimum target total estimated power consumption obtained from all first total estimated power consumption, the first total estimated power consumption is determined according to estimated power consumption calculated according to motor required torque of each electric drive system, and the motor required torque is determined according to the wheel end required torque; calculating motor required torque of each electric drive system according to the first torque distribution ratio and the wheel end required torque; calculating a second total estimated power consumption of all of the electric drive systems based on the motor demand torque of each electric drive system and the corresponding drive information, wherein the second total estimated power consumption is determined based on a first estimated power consumption determined based on an electric drive system having a motor demand torque other than zero and a second estimated power consumption determined based on an electric drive system having a motor demand torque of zero; and updating the first torque distribution ratio according to the second total expected consumed power and the limiting power of the energy end, and outputting the updated first torque distribution as a target torque distribution ratio.
9. The method of controlling vehicle torque according to claim 8, wherein the step of updating the first torque distribution ratio based on the second total predicted power consumption and the limit power at the energy end includes: Comparing the second total predicted power consumption with the limited power at the energy end; if the second total predicted power consumption is less than or equal to the limit power, taking the first torque distribution ratio as a target torque distribution ratio; If the second total predicted power consumption is greater than the limit power, the wheel end demand torque is reduced and the step of determining a first torque distribution ratio of the vehicle is performed back to update the first torque distribution ratio.
10. The control method of claim 8, wherein the step of determining the first torque distribution ratio of the vehicle includes: A first torque distribution ratio of the vehicle is determined, and the first torque distribution ratio is updated according to a maximum torque boundary fed back by each electric drive system.
11. A vehicle controller comprising a memory, a processor and a torque control program stored in the memory and executable on the processor, the torque control program when executed by the processor implementing the steps of the vehicle torque control method according to any one of claims 1 to 10.
12. A readable storage medium, characterized in that the readable storage medium stores a torque control program which, when executed by a processor, implements the steps of the vehicle torque control method according to any one of claims 1 to 10.

Description

Vehicle torque control method, vehicle controller, and readable storage medium Technical Field The present invention relates to the field of automotive technologies, and in particular, to a method for controlling torque of a vehicle, a vehicle controller, and a readable storage medium. Background With the development of technology and the improvement of living standard, automobiles have become an important transportation means in people's daily life. Especially, under the trend of developing new energy in China, new energy automobiles are increasingly favored by users. Most of the new energy automobiles are driven by using a dual electric drive system or a multiple electric drive system, and therefore, torque distribution is required for each electric drive system. At present, the torque distribution ratio with optimal comprehensive efficiency of a plurality of electric drive systems is generally calculated in an off-line simulation mode, then the torque distribution ratio is written into a controller, the torque distribution ratio is obtained through table lookup when a vehicle runs, and then the torque is output according to the torque distribution ratio. However, in the exemplary technique, the torque distribution ratio is calculated in an offline state, and the result obtained by the table look-up method is generally the torque distribution ratio when the vehicle state is optimal, but the vehicle is not in the optimal state during running, so the torque distribution ratio obtained by the table look-up method makes the efficiency of the electric drive system low and the economy of the electric drive system not high. Disclosure of Invention The invention mainly aims to provide a control method of vehicle torque, a vehicle controller and a readable storage medium, which aim to improve the efficiency of a vehicle electric drive system and further improve the economy of the electric drive system. Based on this, the invention provides a control method of vehicle torque, the control method of vehicle torque including the steps of: determining a vehicle wheel end required torque according to the vehicle state information; Setting a plurality of torque distribution ratios, and calculating the motor required torque of each electric drive system under each torque distribution ratio according to the wheel end required torque; calculating the estimated consumption power of each electric drive system according to the motor required torque of each electric drive system and the corresponding drive information, and obtaining the first total estimated consumption power of all the electric drive systems corresponding to each torque distribution ratio; A target torque distribution ratio is determined based on all of the first total predicted power consumption. Optionally, the step of setting a plurality of torque distribution ratios, and calculating the motor required torque of each electric drive system according to the wheel end required torque includes: Setting a plurality of torque distribution ratios, and adjusting each torque distribution ratio according to the maximum torque boundary fed back by each electric drive system; And calculating the motor required torque of each electric drive system under each adjusted torque distribution ratio according to the wheel end required torque. Optionally, the step of determining the target torque distribution ratio according to all the first total predicted consumed power includes: Determining a first torque distribution ratio based on all of the first total predicted power consumption; Acquiring a maximum torque boundary fed back by each electric drive system, and adjusting the first torque distribution ratio based on the maximum torque boundary; and determining the adjusted first torque distribution ratio as a target torque distribution ratio. Optionally, the step of calculating the motor demand torque of each electric drive system corresponding to the torque distribution ratio according to the wheel end demand torque includes: And calculating the motor required torque of each electric drive system according to the wheel end required torque, the torque distribution ratio, the speed ratio and the speed reducer efficiency. Optionally, the step of determining the target torque distribution ratio according to all the first total predicted consumed power includes: obtaining the minimum target total predicted power consumption from all the first total predicted power consumption; and taking the calculated torque distribution ratio of the target total predicted consumed power as a target torque distribution ratio. Optionally, the step of determining the target torque distribution ratio according to all the first total predicted consumed power includes: obtaining the minimum target total predicted power consumption from all the first total predicted power consumption; taking the calculated torque distribution ratio of the target total expected consumed power as a first torque distrib