Oil injection transition control method for direct injection engine from starting state to idling state

Abstract

The invention discloses an oil injection transition control method for a direct injection engine from a starting state to an idling state. When an engine starting state is transited to an engine idling state, an oil injection starting angle SOI1 in the engine starting state is transited to an oil injection starting angle SOI2 in the engine idling state by increasing an angle of delta SOI at K times, and an oil injection end angle EOI1 of the engine starting state is transited to an oil injection end angle EOI2 of the engine idling state by increasing an angle of delta EOI at K times, wherein Nis larger than or equal to 2, and K is larger than or equal to 2. In the oil injection transition control method, a transition control is added in the process that the engine starting state is transited to the engine idling state, and the engine is gradually changed into the idling state from the starting state, so that combustion of the engine is slowly changed, sudden change of a rotating speedof the engine is avoided, and a fluctuation amount can be controlled to be 20r / min.

Description

technical field [0001] The invention relates to a control method for an in-cylinder direct-injection gasoline engine, which belongs to the technical field of direct-injection gasoline engine control, and in particular to a method for controlling the fuel injection transition of the direct-injection engine from startup to idle speed. Background technique [0002] The working process of an in-cylinder direct injection gasoline engine generally includes the following stages: engine starting state and engine idling state. When the engine is starting and engine idling state, the fuel injection timing will suddenly have a jump of about 60°CA. The timing jump will cause the speed to be unstable during the change of the engine state, which will cause the actual output torque of the engine to fluctuate and affect the service life of the engine. Contents of the invention [0003] The object of the present invention is to provide a fuel injection transition control method from start ...

AI Technical Summary

Problems solved by technology

[0002] The working process of an in-cylinder direct injection gasoline engine generally includes the following stages: engine starting state and engine idling state. When the engine is starting and engine idling state, the fuel injection timing will suddenly have a jump of about 60°CA. The timing jump will cause the speed to be unstable during the change of the engine state, which will cause the actual output torque of the engine to fluctuate and affect the service life of the engine

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