An automobile motor galloping fault detection device and a working method thereof

Abstract

The invention discloses an automobile motor galloping fault detection device and a working method thereof, and the device comprises the following parts: a galloping fault monitoring module which is used for monitoring the state of an automobile motor; a galloping fault protection module used for receiving the state of the automobile motor and carrying out protection operation on the automobile motor in a galloping state. The method has the following beneficial effects that no extra hardware cost needs to be increased, and a controller and a power supply can be judged and protected from being damaged before the galloping fault reaches an uncontrollable state. Whether galloping occurs or not is judged without depending on the rotating speed, and whether galloping occurs or not is judged according to the rotating speed acceleration. And a galloping fault acceleration threshold value is obtained through an actual test table, so that the accuracy and rapidity of fault judgment are both considered. According to the galloping protection strategy, the rotating speed is prevented from continuously and rapidly rising, the rotating speed is rapidly decreased, the motor is closed after the safe rotating speed is achieved, and the safety of motor electronic control, a battery and field personnel is protected to a great extent.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a vehicle motor overrun fault detection device for a pure electric vehicle and a working method thereof. Background technique [0002] Pure electric vehicles have attracted widespread attention due to their good handling experience, low environmental pollution, high efficiency, and use of renewable energy. As the key parts of the motor and electric control, more attention should be paid to its fault detection and protection. During the operation of the pure electric vehicle motor, due to some reason, the motor speed suddenly increases sharply and sharply, and this phenomenon is called motor speed. In the event of a flying car failure, the motor speed is likely to exceed the speed that the control can withstand and run out of control. The extremely high back electromotive force of the motor will cause damage to the controller and battery. There are many reasons for the spe...

AI Technical Summary

Problems solved by technology

This method only judges whether the car is flying by the speed. Since the pure electric vehicle motor has a wide range of speed regulation, it can reach more than twice the rated speed in normal operation, so it is not applicable.

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