Automatic transmission fuel cell vehicle motor torque limiting method

Abstract

The invention provides an automatic transmission fuel cell vehicle motor torque limiting method which comprises the following steps: after a whole vehicle is powered on, acquiring related data by a whole vehicle controller, calculating auxiliary engine power according to the acquired data, and then calculating charging power of an allowable motor of a whole automobile system and discharging powerof the allowable motor of the whole automobile system according to the auxiliary engine power; converting the charging power of the motor allowed by the whole vehicle system and the discharging powerof the motor allowed by the whole vehicle system to obtain braking torque of the motor allowed by the whole vehicle system and driving torque of the motor allowed by the whole vehicle system, then calculating to obtain a motor torque target initial value, and sending the motor torque target initial value to a motor controller to control the motor to execute; obtaining the real-time power of the motor at the moment, then obtaining a motor power deviation value through calculation, obtaining a correction coefficient through table look-up according to the motor power deviation value, and finallymultiplying the motor torque target initial value by the correction coefficient to obtain a motor torque target final value. The method is simple and feasible, and the torque of the motor can be accurately limited.

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