Voltage discharge method for motor controller, system and vehicle

Abstract

The invention provides a voltage discharge method for a motor controller, a system and a vehicle. The method comprises steps: a discharge command is received; a motor winding discharge circuit is controlled to be conducted to discharge the motor controller; after first predetermined time, whether the voltage of a bus drops to safety voltage is judged; if not, an active discharge circuit is controlled to discharge the motor controller intermittently until the active discharge circuit continuously discharges the motor controller when the voltage drop of the bus voltage is larger than predetermined voltage drop; and after second predetermined time,, if the bus voltage does not drop to the safety voltage, discharge is stopped, discharge timeout signals are reported, or otherwise, discharge onthe motor controller is completed. The method can quickly discharge the voltage of a DC bus capacitor in the motor controller after normal high voltage switching off of the whole vehicle, and high voltage power consumption safety is further improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a voltage discharge method and system for a motor controller and a vehicle. Background technique [0002] Traditional fuel vehicles have the disadvantages of high pollution and high energy consumption. Therefore, with the increasing environmental pollution and the increasing consumption of non-renewable energy, electric vehicles have been widely developed. Electric vehicles have the advantages of zero pollution and zero emissions. However, electric vehicles use high-voltage electricity as the power source and motors as the power source. Among them, the drive control system in electric vehicles is composed of power batteries, motors, motor controllers, etc., and its working voltage is as high as several hundred volts. [0003] Therefore, the high voltage existing in the motor system and the battery system will be very dangerous if the contacts are exposed, so how to quickly d...

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Problems solved by technology

[0003] Therefore, the high voltage existing in the motor system and the battery system will be very dangerous if the contacts are exposed, so how to quickly discharge the high voltage in the motor controller after the vehicle is powered off is very important. The discharge method is relatively immature, and there are usually problems such as relatively long discharge time

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