Safe turning-of system and method for vehicle electric motor torque

Abstract

The invention relates to a safe turning-of system and method for a vehicle electric motor torque. The system includes two turning-off paths and a single-chip microprocessor abnormity detecting part. The single-chip microprocessor abnormity detecting part is used for detecting abnormal state of a single-chip microprocessor and outputting corresponding safety state control information according to adetection result. The first turning-off path and the second turning-off path are used for executing vehicle electric motor torque turning-off control. Besides, the first turning-off path and the second turning-off path are controlled by the single-chip microprocessor when the single-chip microprocessor works normally and is controlled by the single-chip microprocessor abnormity detecting part when the single-chip microprocessor meets abnormity. By adopting the system and method provided by the invention, since the single-chip microprocessor abnormity detecting part is adopted, influence on aturning-off part when the single-chip microprocessor works normally by safety state control information is avoided through a logic gate circuit and the highest turning-off control priority when the single-chip microprocessor meets abnormity is achieved. Therefore, safe and reliable vehicle electric motor torque turning-off can be realized with a simple principle and an excellent effect.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to the field of motor torque control for electric vehicles, and in particular to a torque safety shutdown system and method for vehicle motors. Background technique [0002] With the rapid and large-scale popularization of new energy vehicles, the subsequent safety issues are becoming more and more prominent. In vehicle control, abnormal torque output may lead to unexpected acceleration of the vehicle or unexpected emergency braking, which may lead to car accidents occurrence, there is a great security risk. For pure electric vehicles, the vehicle motor is the only torque output device, and the vehicle motor controller is the soul of the vehicle motor's operation. Therefore, the normal operation of the vehicle motor controller is also related to whether the torque can be output normally. [0003] At present, the vehicle motor controller solution is mainly composed of a controller a...

AI Technical Summary

Problems solved by technology

[0011] Comprehensive analysis shows that the third method is the optimal shutdown method. However, the third method increases the complexity of the system. The procedure for shutdown requires accurate measurement of the speed of the vehicle motor. If the measurement is inaccurate, As a result, the first solution is executed at high speed, which may cause damage to the device, and there is a certain risk

Although the second solution may cause a braking torque, it is relatively safe for the vehicle because the abnormality of the vehicle motor torque is handled when the vehicle is running at a low speed and the duration is very short.

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