Flexible control system and method for alternating current asynchronous drive motor of electric vehicle

Abstract

The invention relates to the intelligent control technique of new energy vehicles and particularly to a flexible control system and method for an alternating current asynchronous drive motor of an electric vehicle. The output end of an automatic speed regulator (ASR) and the output end of an automatic voltage regulator (AVR) are both connected with the input end of a reverse PI (Proportional Integral) controller, and the amplitude limiting threshold value of the reverse PI controller can be adjusted dynamically in real time; the input end of the reverse PI controller is connected to an amplitude limiting threshold operator; the maximal amplitude limiting threshold value or the minimal amplitude limiting threshold value of the ASR or the AVR is worked out by the amplitude limiting threshold operator and then is compared with the control quantity c of the controller, and the control quantity c is satisfied by treatment and adjustment of the reverse PI controller, so that the control quantity c can remain unchanged when the working condition of the electric vehicle is changed, a state changeover switch is avoided, the control structure is simple and clear, and the stability of the control effect is better.

Description

technical field [0001] The invention relates to an intelligent control technology of a new energy vehicle, in particular to a flexible control system and method for an AC asynchronous drive motor of an electric vehicle. Background technique [0002] The global oil crisis and deteriorating environmental pollution are important problems facing mankind in the 21st century, and this problem is particularly prominent in our country. Replacing traditional diesel locomotives with electric vehicles is an effective way to solve these problems, and it is also an inevitable trend in the development of the modern automobile industry. [0003] In the development of electric vehicles, body design, drive system, energy system and energy management system have become four key technologies, among which the drive system plays a vital role. At present, the motor drive system of electric vehicles mainly includes the drive system of asynchronous motor and permanent magnet synchronous motor, and...

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to propose a flexible control system and method for AC asynchronous drive motors of electric vehicles on the basis of traditional electric vehicle motor vector control, combined with factors such as stability and compliance, to solve the problem of control parameters and For the problem of speed fluctuation caused by the sudden change of the control target, a unified controller is used to convert the switching of the electric vehicle's three working conditions of constant speed, acceleration overload, and high-speed magnetic field weakening into changes in the control output limit threshold, which avoids The speed fluctuation caused by the switching of working conditions improves the stability of control

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