Engine starting and shutdown control method and system for dual motor extended range driving hybrid vehicles

Abstract

The invention discloses an engine starting and shutdown control method for dual motor extended range driving hybrid vehicles. A starting control method includes responding to the meeting of an enginestarting condition, sending a starting instruction to an engine, and sending a dragging instruction for dragging the engine to rotate to an ISG; detecting the rotating speed of the engine, respondingto the rotating speed of the engine greater than a rotating speed threshold value A, and sending an allow oil injection instruction to the engine; responding to the detection of the oil injection of the engine, and sending an unloading instruction for unloading drag torque to the ISG; and responding to the normal running of the engine after the unloading of drag torque so that the starting can beconsidered to be successful. A shutdown control method includes responding to the meeting of an engine shutdown condition, and sending a shutdown instruction to the engine; and after a while, responding to the detection that the rotating speed of the engine is less than a rotating speed threshold value B so that the shutdown can be considered to be successful. A corresponding system is simultaneously disclosed. Thus, the controlling on the starting and shutdown of the engine can be accurate and rapid, the rapid and smooth switching of a hybrid power mode can be guaranteed, and strong robustness can be achieved.

Description

technical field [0001] The invention relates to a method and system for controlling the engine start and stop of a dual-motor range-extending drive hybrid electric vehicle, and belongs to the field of electric vehicles. Background technique [0002] At present, the characteristics of energy saving, environmental protection, mature technology and relatively low cost of hybrid electric vehicles will make them one of the preferred solutions to replace traditional vehicles in the near future. Major domestic car companies are also actively launching hybrid vehicles with different structures, and the sales of hybrid vehicles are in a stage of rapid growth. Dual-motor range-extended drive hybrid vehicles have the characteristics of both hybrid vehicles and pure electric vehicles. In order to ensure the economical and dynamic advantages of the system vehicle, the hybrid mode switching needs to be as fast and smooth as possible. As a hybrid mode One of the steps in switching, engine...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method and system for controlling the engine start and stop of a dual-motor extended-range drive hybrid electric vehicle, which solves the above-mentioned problems existing in the existing engine start and stop control

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