Control method for clutch starting engine of deep hybrid electric vehicle

Abstract

The invention provides a control method for starting an engine by using a clutch of a deep hybrid power automobile. The method comprises the steps that whether or not starting demands of the engine are met is judged by a starting demand judging module, if yes, the steps of oil filling of a first clutch, the dragging of an engine of the first clutch, oil spraying control of the engine, PI controlling and first clutch closing are sequentially conducted, and the starting of the engine is completed; during the oil filling process of the first clutch, starting process time tes of a current engine is judged, slipping work Q of a unit area of a current first clutch and the starting process time tes of the engine are judged in the steps of the dragging of the engine of the first clutch, the oil spraying control of the engine and the PI controlling, if judging results exceed limiting values, current steps are ceased, whether or not judging failing times are exceeded is judged, and judging stepsof the starting demands of the engine are executed again or a fault mode is entered according to judging results. The method is easy and achievable, and the smoothness of the starting process of theengine can be ensured to prevent the shaking of the automobile.

Description

technical field [0001] The invention relates to a control method for starting an engine of an automobile, in particular to a control method for a clutch starting engine of a deep hybrid electric vehicle. Background technique [0002] With the growth of population and economy, energy and environmental issues have prompted countries to develop new energy vehicles, energy-saving and environment-friendly vehicles. Hybrid electric vehicles are energy-saving and environmentally friendly, and have a broad market space and good development prospects. [0003] Hybrid vehicles have the function of starting and stopping the engine, and the working conditions of starting the engine are very frequent. At the same time, in order to obtain better fuel consumption, clutches and brakes are added to realize the shift function and optimize the working point of the engine. Therefore, the impact of starting the engine on power and economy is very important. [0004] The impact of the engine st...

AI Technical Summary

Problems solved by technology

[0004] The impact of the engine starting process of the deep hybrid synthesis box directly affects the driving experience of the car. For example, the invention patent with the patent No. 200910194470.5 discloses a dual-planetary four-shaft hybrid transmission device. There are two starting shocks, one is the low-speed pulsating resistance torque caused by the pumping loss during the engine starting process, and the other is the explosive torque generated by the engine fuel injection and ignition, which produces torque disturbance to the drive train and causes torque fluctuations of the vehicle

In the prior art, the series hybrid power system, because the engine crankshaft is directly connected with the gearbox shaft, can not shield the vibration problem caused by the sudden change of the engine torque on the output shaft of the gearbox when the engine fuel injection is ignited. The air volume and fuel injection volume are still in the open-loop control stage, and the explosive torque generated is uncertain, which leads to poor consistency of vehicle smoothness

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