Test method and device for motor active short-circuit relay, and storage medium

By detecting and controlling the switching status of the relay in pure electric vehicles, the effective operation of the motor active short-circuit relay is ensured, the problem of poor detection in the existing technology is solved, and driving safety is improved.

CN109406997AActive Publication Date: 2019-03-01BEIJING ELECTRIC VEHICLE
7 Cites 8 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING ELECTRIC VEHICLE
Filing Date
2018-11-30
Publication Date
2019-03-01

AI Technical Summary

Technical Problem

The existing technology fails to effectively detect and protect the working status of the motor active short-circuit relay in pure electric vehicles, resulting in the inability to ensure driving safety in the event of a fault.

Method used

A testing method and device for a motor active short-circuit relay is proposed. By performing zero-speed detection after low-voltage power-on of the motor controller, the switch state of the relay is controlled, and the power-on and closed states of the relay are determined by injecting excitation signals to ensure that the relay It can effectively realize the active short circuit function during normal operation.

Benefits of technology

Reliable testing of the motor active short-circuit relay is achieved to ensure the reliability of the vehicle's motor active short-circuit function during driving and avoid potential safety hazards caused by relay failure.

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Abstract

The invention provides a test method and device for a motor active short-circuit relay, and a storage medium. The method includes the steps: performing the zero speed detection of a motor after a motor controller completes a low-voltage power-on operation, wherein when the motor controller is powered down, a first relay and a second relay are both switched on; controlling the second relay to be turned on if the motor passes the zero speed detection, and injecting a first excitation signal at the control ends of a first phase winding and a third phase winding through the motor controller; performing injection detection of the first excitation signal to determine whether the first excitation signal is successfully injected or not; controlling the first relay to be turned on if the first excitation signal is successfully injected, and obtaining a voltage across two ends of the first relay; and judging whether the power-on test of the first relay is successful or not according to the voltage across two ends of the first relay. The method can realize the turn-on test of the short-circuit relay, and ensures the reliability of the active short-circuit function of the vehicle motor duringdriving.
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Citation Information

Patent Citations

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