Electric vehicle encoder disconnection detection system and method

Abstract

The invention relates to an electric vehicle encoder connection-losing detection system and method. The system comprises an encoder and a motor, and the encoder and the motor synchronously rotate. The system further comprises a motor controller connected to the motor and a signal acquisitionunit connected with the motor controller and the motor; the motor controller comprises a phase calculation unit and a shutdown control unit. The signal acquisition unit is used for obtaining the actual rotating speed of the motor; the phase calculation unit is used for providing the set target rotating speed and obtaining a directional phase and an observation phase according to the target rotating speed and the actual rotating speed; and the shutdown control unit is used for judging whether the encoder loses connection through comparison between the difference value of the directional phase and the observation phase and the preset difference value, and controlling the motor to stop running when the encoder loses connection. According to the system, the connection-losing failure of the encoder can be found in time, and the phenomenon that the motor is locked is avoided.

Description

technical field [0001] The invention relates to the field of encoder detection, and more specifically, to a system and method for detecting an encoder disconnection. Background technique [0002] An encoder is a rotary sensor that converts rotational displacement into a series of digital pulse signals, and is especially widely used in low-voltage electric vehicles such as miniature vehicles and low-speed vehicles. The material of the traditional photoelectric encoder code disc is glass, metal, plastic, and the glass code disc is deposited on the glass with very thin score lines. Its thermal stability and accuracy can meet the general requirements of ordinary standards, but it is easy to break. The metal code disc is directly engraved with pass and no pass, although it is not fragile, but due to the certain thickness of the metal, the accuracy is limited, and its thermal stability is an order of magnitude worse than that of the glass code disc. Plastic code discs are more ec...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method that can accurately detect the disconnection of a magnetic induction encoder in view of the defects that the existing encoder disconnection detection method takes a long time to judge and cannot avoid the emergency braking of the vehicle at the moment the encoder disconnects. Encoder detection system and method of

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