Method and system for in-cylinder direct-injection gasoline engine stratified equivalent proportion combustion

Abstract

The present invention discloses a direct injection gasoline engine stratified equivalent proportion combustion method which comprises the steps as follows: first fuel injection is processed during charging process, and homogeneous thin mixed gas is formed when an upper stop point is compressed; second or multiple fuel injections are processed during compressing process, and a dense mixed gas area is formed around a spark plug; the spark plug ignites to burn the fuel. The present invention also discloses a direct injection gasoline engine stratified equivalent proportion combustion system which comprises an oil atomizer, an electric control unit and the spark plug. When the method and the system of the present invention are used, harmful emission produced by gasoline delaminated equivalent proportion mixed gas combustion can be effectively controlled by the traditional gasoline engine three-way catalyst, thereby solving the problem that a first generation GDI stratified thin burning method has large difficulty for developing lean-burn catalyst and high cost and is not easy for controlling the discharge. At the same time, the stratified equivalent proportion combustion method can bring higher fuel economical efficiency than a second generation GDI homogeneous equivalent proportion combustion method and can inhibit detonation.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a method and system for stratified equivalence ratio combustion of an in-cylinder direct injection gasoline engine. Background technique [0002] In-cylinder direct injection gasoline engine can form a homogeneous or stratified mixture by controlling the fuel injection timing. The combustion methods of gasoline direct injection technology that have been applied at present are mainly divided into two types, namely, stratified lean combustion and homogeneous equivalence ratio combustion. The first generation of GDI adopts the combustion method of stratified lean combustion, which is mainly represented by companies such as Mitsubishi, Toyota and Nissan in the 1990s. It uses in-cylinder fuel injection to form a heterogeneous stratified mixture to ensure that the ignition is instant. The surrounding area forms a rich mixture that is easy to ignite, while the rest ...

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Problems solved by technology

[0005] The problem to be solved by the embodiment of the present invention is to provide a method and system for stratified equivalence ratio combustion of an in-cylinder direct injection gasoline engine, so as to overcome the traditional gasoline engine in the prior art due to the use of equivalence ratio homogeneous mixture to ignite the combustion mode. Defects of easy knocking under low speed and heavy load conditions

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