Control method and system for adjusting rotating speed stability of range extender

Abstract

The invention provides a control method and system for adjusting rotating speed stability of a range extender. The control method comprises the following steps that: the target rotating speed nset ofthe engine and the target torque Tset of the generator are output according to a power request of a whole vehicle; the target torque Tset of the generator is taken as a feed-forward torque Tforward, and the engine responds to the feed-forward torque so as to enable the rotating speed of the engine to be close to the target rotating speed; and when the rotating speed of the engine is close to the target rotating speed, the engine is maintained within the target rotating speed according to PID rotating speed closed-loop control. Through the generator real-time torque compensation control methodand PID rotating speed closed-loop accurate control, the rotating speed of the range extender can be continuously and stably output under the target power, the fluctuation of the rotating speed of theengine is reduced, and then the purposes of reducing vibration of a range extender system and improving the overall NVH performance of the range extender are achieved.

Description

technical field [0001] The present invention relates to the technical field of new energy vehicles, in particular to a control method and system for adjusting the speed stability of a range extender. Background technique [0002] With the promotion of new energy technologies, range-extended electric vehicles have become more and more popular. Different from traditional pure electric vehicles, the biggest advantage of range-extended electric vehicles is their long cruising range, and its core components are mainly range extenders composed of engines, generators and their controllers. [0003] Although the appearance of the range extender can better solve the problem of the short cruising range of pure electric vehicles, the premise is to ensure that the range extender can continuously and stably output power. Among them, the speed stability of the range extender directly affects whether the range extender can work stably. Considering the harsh working conditions of the rang...

AI Technical Summary

Problems solved by technology

However, this method has the following deficiencies: 1) How to quickly adjust the range extender when signal interference is not considered; 2) When multiple operating point transitions, relying solely on engine speed control and generator torque control cannot quickly meet the power point. Due to the slow response time of the engine, the engine torque cannot keep up with the motor torque adjustment, resulting in a longer time for the range extender to reach a stable working condition; However, the prior art does not provide corresponding solutions to deal with emergencies

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