New energy vehicle motor stall fault detection method

Abstract

The invention discloses a new energy automotive motor stall fault detection method. According to the method, the rotation speed of a motor is collected; whether the rotation speed of the motor is greater than a rotation speed preset value is judged; the switching frequency of a motor controller is set to a first switching frequency preset value or a second switching frequency preset value; three-phase motor current of the motor is acquired, a motor current effective value is calculated; whether the motor current effective value is greater than a first current reset value and a second current reset value is judged; related processing is performed on a motor current effective value accumulated value; whether the motor current effective value accumulated value is greater than N times of the first current preset value, if the motor current effective value accumulated value is greater than the N times of the first current preset value, the torque output value of the motor controller is reduced at a certain speed; and when the torque output value of the motor controller is smaller than 0, motor driving is stopped, and a stall fault is reported. According to the method, when the stall fault of the motor is detected, the torque output of the motor controller is stopped in time, so that the IGBT driving module of the motor controller and the motor can be safely and reliably protected.

Description

technical field [0001] The invention relates to a method for detecting a motor stall fault of a new energy vehicle. Background technique [0002] The motor of new energy vehicles will be blocked due to mechanical jamming or too much external resistance. If the driver continues to step on the accelerator deeply under this working condition, the motor will output high torque at a stalled or extremely low speed, resulting in motor control. If the IGBT drive module and motor temperature of the inverter rise too fast, it will eventually cause damage or cause it to burn out. [0003] In view of the above problems, the traditional new energy vehicle motor stall fault detection is usually to preset the current threshold of the motor, start the timer when the motor current value is greater than the preset current threshold, and start the timer when the motor current value is greater than the current threshold, When the motor current value is less than the preset current threshold, t...

AI Technical Summary

Problems solved by technology

However, the working conditions of new energy vehicles are complex and changeable. This method does not take into account the frequent occurrence of motor current values ​​greater than the preset current threshold, but the timer does not reach the fault alarm. Therefore, this method is not effective. The motor stall fault is detected, but in fact, under this working condition, the temperature rise of the IGBT driver module and the motor of the motor controller will continue to accumulate, so the IGBT driver module and the motor of the motor controller cannot be properly protected

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