Motor torque limit method for automatic transmission fuel cell vehicle

Abstract

The invention provides a method for limiting the motor torque of an automatic transmission fuel cell vehicle. After the vehicle is powered on, the vehicle controller acquires relevant data, calculates the power of the auxiliary machine according to the acquired data, and then calculates the power of the whole vehicle according to the power of the auxiliary machine. The charging power of the motor allowed by the system and the discharging power of the motor allowed by the whole vehicle system are converted into the allowed motor charging power of the whole vehicle system and the discharging power of the motor allowed by the whole vehicle system to obtain the braking torque of the motor allowed by the whole vehicle system, the whole vehicle system Allow the driving torque of the motor, and then calculate the initial value of the motor torque target, send the initial value of the motor torque target to the motor controller to control the motor execution, obtain the real-time power of the motor at this time, and then calculate the motor power deviation value, The correction coefficient is obtained by looking up the motor power deviation value, and finally the final value of the motor torque target is obtained by multiplying the initial value of the motor torque target by the correction coefficient. The method of the invention is simple and feasible, and can accurately limit the torque of the motor.

Description

technical field [0001] The invention relates to a motor torque limiting method of an automatic transmission fuel cell vehicle. Background technique [0002] The energy supply of a hydrogen energy tractor (fuel cell vehicle) includes a power battery and a fuel cell, and the driving part is a solution of a motor plus a gearbox. The loading and unloading of the vehicle will also cause fluctuations in the power supply voltage of the vehicle, which will affect the output power of the motor. According to the external characteristic curve of the motor, when the motor bus input a lower voltage, the corresponding motor output peak power is also low, and when the motor bus input a higher voltage, the corresponding motor output peak power would be too large, plus the motor system includes a gearbox system, the motor And gearbox system efficiency will also have an impact on the output power of the motor. In order to prevent the target power of the motor from exceeding the allowable po...

AI Technical Summary

Problems solved by technology

In order to prevent the target power of the motor from exceeding the allowable power of the motor, the motor torque will be limited accordingly, and there are many ways to limit the motor torque. For example, the patent title of publication number CN106080242 A is "Motor Power Control for Pure Electric Vehicles". Method and system" and the patent title of CN104682828A "a motor power limiting method and motor control system" all have related motor torque limiting methods, but the previous patent is when the battery voltage platform is higher than the motor rated platform Or when the efficiency of the motor is low at a certain point, the motor power obtained by the final limit sometimes exceeds the allowable value of the motor power; and the latter patent will only play a role in limiting regulation when the output power of the motor exceeds the limit value, that is to say, the motor power It cannot completely fall within the limit value range, there will always be power points exceeding the limit value