Electric vehicle and performance monitoring method and system of electric vehicle driving system

Abstract

The invention provides an electric vehicle and a performance monitoring method and system for an electric vehicle driving system, which can execute the following steps: in each parking or deceleration process of the electric vehicle, detecting the no-load back electromotive force u of a permanent magnet motor of the electric vehicle on line; or automatically starting the test task at regular intervals or every preset time length Tt, waiting for parking or deceleration of the electric vehicle in real time after the test task is automatically started, and detecting the no-load back electromotive force u of the permanent magnet motor of the electric vehicle on line in the parking or deceleration process of the waiting electric vehicle after the waiting electric vehicle is parked or decelerated; and when the no-load back electromotive force u of the permanent magnet motor of the electric vehicle is detected every time, monitoring the performance of the driving system of the electric vehicle according to the correspondingly detected no-load back electromotive force u. The method and the system are used for improving the vehicle using safety of the user.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to an electric vehicle and a performance monitoring method and system for an electric vehicle driving system. Background technique [0002] An electric vehicle (BEV) refers to a vehicle that is powered by an on-board power supply and uses a motor to drive the wheels. Because it has less impact on the environment than traditional cars, it has become more and more popular among the public. [0003] Permanent magnet synchronous motors (referred to as permanent magnet motors) have been increasingly used due to their compact structure, small size, light weight, high efficiency, high torque, high power density, reliable operation, and low noise. in the field of electric vehicle drives. [0004] Due to the complex operating road conditions of electric vehicle drive motors, the permanent magnets of the rotor are easily demagnetized by factors such as temperature, reverse magnetic field, a...

AI Technical Summary

Problems solved by technology

[0004]Due to the complex road conditions of the electric vehicle drive motor, the rotor permanent magnet is easily demagnetized by factors such as temperature, reverse magnetic field, aging, vibration, and chemical environment. Once an irreversible demagnetization fault occurs on the permanent magnet, it will lead to a decrease in the performance index of the permanent magnet motor, running heat, increased current, and poor torque performance. In severe cases, the motor may be out of control and scrapped. User car safety

Images