Vehicle high-voltage discharge control method and device and vehicle

Abstract

The invention relates to a vehicle high-voltage discharge control method and device and a vehicle. The method applied to the vehicle control unit comprises the steps that when a high-voltage system is powered off, a first instruction used for indicating to discharge the high-voltage system is sent to a direct current-direct current converter; and obtaining a first voltage of a high-voltage bus at the input end of the DC-DC converter, and sending out a first fault alarm when the first voltage is greater than or equal to a preset voltage threshold and the discharge duration is greater than a first preset duration threshold. Therefore, no matter normal power failure or abnormal power failure, high-voltage electric energy can be quickly discharged, the risk of high-voltage electric energy leakage is reduced, and the personal safety of a driver and passengers is improved. Besides, the first fault alarm is sent out, so that the user and the vehicle control unit can detect the fault reason and remove the fault in time, the vehicle safety is improved, the purpose of reminding the user to be away from the high-voltage part can be achieved, and the risk of high-voltage electric shock of the user caused by the fact that high-voltage electric energy is not discharged completely is reduced.

Description

technical field [0001] The present disclosure relates to the field of vehicles, and in particular, to a vehicle high-voltage discharge control method, device, and vehicle. Background technique [0002] With the popularity of new energy vehicles, people have higher and higher requirements for the safety performance of new energy vehicles working in high-pressure environments. After the new energy vehicle is powered on, the entire high-voltage system will have high-voltage power. Whether it is a normal power-off or an abnormal power-off (for example, collision or failure), it is necessary to quickly discharge the high-voltage power in the high-voltage system. To avoid personal injury caused by high-voltage electric shock. At present, the high-voltage electric energy is discharged (ie, discharged) mainly through the motor system, wherein the motor system includes a motor controller, a motor winding, and a discharge resistor. Specifically, in the case of normal power failure, ...

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Problems solved by technology

Specifically, in the case of normal power failure, the discharge is carried out through the motor winding and the discharge resistor, and the discharge time can meet the discharge time limit requirements, but in the case of abnormal power failure, the motor winding will enter an active short circuit state. At this time, only through the motor The discharge resistor in the system discharges, and the discharge speed will be much slower than that during normal power failure.

In the case of a collision, it is a more dangerous working condition, and it is even more necessary to realize the discharge quickly. Obviously, the existing discharge method cannot meet the time limit requirement, and the driver and passengers are at risk of electric shock.

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