Speed ​​Ripple Suppression Method for Electric Vehicle Drive System

Abstract

The invention provides a method for inhibiting the velocity fluctuation of an electric vehicle driving system. The method comprises the following steps: obtaining a rotor position by adopting an encoder, and transmitting the rotor position to a velocity control ring; and adopting a parallel mode combining a prediction PI joint controller, a repetitive controller and a nonlinear adaptive feedback observer by the velocity control ring, adopting the parallel mode of the prediction PI joint controller and the repetitive controller during electric start, substituting two continuous sampling values into a prediction domain of the prediction PI joint controller by the encoder, switching to the parallel mode of the repetitive controller and the nonlinear adaptive feedback observer when an electric vehicle enters a stable operation mode, and then transmitting an output signal of the velocity control ring. According to the method provided by the invention, the prediction PI joint control, the nonlinear adaptive feedback observation control, the repetitive control and the vector control are combined together to improve the stability, the accuracy and the dynamic response ability of the electric vehicle driving system and inhibit the velocity fluctuation in an electric vehicle running process.

Description

technical field [0001] The invention relates to a speed pulsation suppression method used in an electric vehicle drive system. A control method combining predictive PI joint controller, nonlinear adaptive feedback observer, repetitive controller and vector control. Background technique [0002] An electric vehicle refers to a vehicle powered by a vehicle-mounted power supply, driven by a motor to drive the wheels, and conforming to the requirements of road traffic and safety regulations. Due to its smaller impact on the environment than traditional cars, its prospects are widely optimistic, and its development is the inevitable product of the oil crisis and people's environmental requirements. Compared with internal combustion engine vehicles, electric vehicles are powered by on-board power supplies, drive wheels with electric motors, and meet the requirements of road safety regulations for vehicles. The key issues restricting the development of the electric vehicle indust...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the torque fluctuations caused by uncertain factors such as motor positioning torque, friction force and parameter changes in the electric vehicle drive control system, thereby causing problems such as system instability, poor control accuracy and low dynamic response capability, the present invention Provide a speed pulsation suppression method for electric vehicle drive system, which combines predictive PI joint controller, nonlinear adaptive observer, repetitive control and vector control to improve the stability and accuracy of electric vehicle drive system and dynamic response capability to achieve pulsation suppression during the operation of electric vehicles

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