Internal combustion engine and combustion method of the same

Abstract

An internal combustion engine, including a premixed mixture formation device that forms a premixed mixture of fuel and air in a combustion chamber, a fuel gas supply device that injects fuel gas directly into the combustion chamber, and an ignition device that ignites the fuel gas. The fuel gas supply device is configured to inject the fuel gas into the premixed mixture near a top dead center of a compression stroke such that a spray of the fuel gas passes through a firing position of the ignition device, to produce the spray of the fuel gas in a predetermined area substantially extending from one end of a cylinder bore to the other end as viewed in a cylinder-bore direction defined by a centerline of the cylinder bore.; The ignition device is configured to directly ignite the spray of the fuel gas and to ignite and burn the premixed mixture by way of flame propagation along the spray of the fuel gas.

Description

technical field [0001] The invention relates to an internal combustion engine which ignites a premixture of fuel and air formed in a combustion chamber. Background technique [0002] Conventionally, it is known that a spark ignition type internal combustion engine can improve thermal efficiency and reduce air pollutants contained in exhaust gas by leaning the mixture of fuel and air. However, spark ignition of a lean mixture sometimes causes unstable combustion. In order to suppress this incomplete combustion and expand the lean burn margin of the air-fuel mixture, many technical developments have been made. Among them, especially in recent years, there has been remarkable progress in premixed compression ignition technology in which a lean mixture (lean premixed gas) that has previously mixed fuel and air is ignited by piston compression. [0003] Patent Document 1 describes a technology combining premixed compression ignition and hydrogen addition combustion. In Patent ...

AI Technical Summary

Problems solved by technology

[0005] In the internal combustion engine described in Patent Document 1, the mixed gas of the first fuel becomes the combustion state of compression autoignition, which cannot fundamentally solve the essential problems of premixed compression ignition, that is, it cannot suppress the combustion noise caused by the rapid generation of heat, and avoid explosion. Shock etc.

Images