A method for realizing speed regulation of electric vehicle range extender

Abstract

The invention discloses an implementation method for speed regulation of a range extender of an electric vehicle. The range extender comprises an engine, an electric generator, a corresponding engine controller and a corresponding electric generator controller, the electric generator, a driving motor and a motive power battery share a direct current bus, and the engine controller and the electric generator controller are both connected with a whole vehicle controller. When the range extender receives a power request sent by the whole vehicle controller, the whole vehicle controller sends corresponding request torque to the engine controller, the engine controller controls the engine to output the request torque, the request torque sent by the whole vehicle controller to the engine controller serves as feedforward, and the electric generator controller controls and regulates torque of the electric generator. The range extender is enabled to work at a target rotation speed, control of the speed regulation of the range extender is achieved, requirements for whole vehicle electric generation are met, the torque of the engine and the torque of the electric generator are coordinated and controlled to achieve response to the target rotation speed, and the torque, electric current and output power of the electric generator have small fluctuation.

Description

technical field [0001] The invention relates to the technical field of electric vehicle control, in particular to a method for realizing speed regulation of an electric vehicle range extender. Background technique [0002] With the progress of society, people's awareness of environmental protection has increased, and the "low-carbon, environmental protection, green" travel mode has gradually attracted great attention. The research on high-efficiency, environment-friendly and energy-saving electric vehicles has aroused great concern of the world's automobile manufacturers. [0003] Due to the defect of the energy density of the power battery of the traditional pure electric vehicle, the insufficient driving range has become an obstacle to the market promotion of the traditional pure electric vehicle. The range-extended electric vehicle adds a range extender composed of an engine and a generator to the traditional electric vehicle, which effectively makes up for the shortcomi...

AI Technical Summary

Problems solved by technology

However, the torque, current and output power of the generator in this speed regulation method fluctuate greatly

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