Engine start control method after automatic halt of hybrid power vehicle

Abstract

The invention relates to an engine start control method after automatic halt of a hybrid power vehicle. The engine start control method comprises the steps of: A, after the hybrid power system enters an automatic halt control mode, judging whether according with a start condition, if not, continuously keeping the automatic halt control mode, if yes, carrying out start control to start the hybrid power system; and B, further judging whether according with an electric crawling start model, if yes, executing the electric crawling start control, if not, executing high-speed rotating speed start control, wherein the electric crawling start mode means that under the condition that the hybrid power motor and a high-voltage battery are in a normal work state, the high-voltage battery can ensure that the hybrid power moor drives the vehicle in an electric drive manner until the engine is ignited through spraying oil and stably works by using a discharge power and high-voltage battery state of charge (SOC). By applying the invention, the engine start smoothness after the automatic halt of the hybrid power vehicle can be improved, the start success rate can be increased, and flameout accidents of the engine, caused by some special conditions, can be eliminated.

Description

【Technical field】 [0001] The invention belongs to the technical field of hybrid electric vehicle control, in particular to an engine start control method after the hybrid electric vehicle automatically stops. 【Background technique】 [0002] In the prior art, a hybrid power system with a start-stop function usually adopts a high-speed start mode when starting after an automatic stop. However, the smoothness of a high-speed start is not easy to control, so it is necessary to improve the automatic stop. Start smoothness problem. [0003] Disclosed in the Chinese Patent Publication No. CN101121407 is the patent literature of a kind of engine start control method of strong hybrid electric vehicle, has described in this method how to carry out engine start control under pure electric working condition, and when vehicle is stationary and is cold How to use the starter and the high-power motor to start the engine together in the engine state. [0004] In addition, the Chinese Pate...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a method for controlling the engine start after the automatic shutdown of the hybrid electric vehicle, to solve the technical problem of poor starting smoothness after the automatic shutdown of the engine, and to improve the success of starting, and at the same time Eliminate the flameout failure of the engine in some special cases

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