A start-stop control method of a special hybrid engine

Abstract

The invention provides a start-stop control method of a hybrid special engine, wherein the start control includes quickly starting the engine by using a high electric motor auxiliary torque backhauling; The auxiliary torque of the control motor decreases slowly after being halved. Controlling the engine to inject fuel; The auxiliary torque of the control motor is gradually reduced to 0, and the engine catches fire steadily. The invention improves the transient working characteristics of the hybrid special engine by optimizing the motor torque auxiliary control process and reasonably utilizingthe capability of multiple injections of the advanced fuel injector. The invention does not need to change the engine hardware structure, and has the advantages of low cost and convenient application.The engine speed is raised to the target speed which is much higher than the traditional speed by using the high electric motor auxiliary torque to start the engine quickly, which greatly reduces thefuel consumption during the starting process and further shortens the light-off time of the after-treatment system. The engine quick start process takes less than 10 engine cycles, significantly reducing the number of incomplete combustion cycles and thus reducing unburned HC emissions.

Description

technical field [0001] The present invention relates to the control field of a hybrid drive system, and more specifically, to a start-stop control method of a hybrid special engine. Background technique [0002] The hybrid electric vehicle (Hybrid Electric Vehicle, HEV) drive system is composed of a traditional internal combustion engine and an electric drive system. It can achieve the purpose of improving the economic performance of the vehicle and reducing exhaust pollution through the advanced vehicle control system. Because of its low investment, wide choice, easy to meet future emission standards and energy-saving goals, hybrid vehicles are being widely valued by domestic and foreign automakers. Hybrid technology can take into account the advantages of pure electric vehicles and traditional fuel vehicles, and has become an important development direction of new energy vehicles in the next stage. [0003] The earliest sign of increasing the degree of electrification of ...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the defects of poor fuel atomization quality and rising unburned HC in traditional hybrid engines, the invention provides a start-stop control method for hybrid special engines

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