Secondary combustion working method of six-stroke internal-combustion engine

Abstract

The invention relates to a secondary combustion working method of a six-stroke internal-combustion engine. In the method, one working cycle of the internal-combustion engine can be divided into an air intake stroke, a primary compression stroke, a primary combustion stroke, a secondary compression stroke, a secondary combustion stroke and an exhaust stroke in sequence by the movement of a piston of the internal-combustion engine, wherein in the primary combustion stroke, primary fuel is used for combustion, and in the secondary combustion stroke, secondary fuel is used for combustion; the primary fuel is sprayed in a cylinder body of the internal-combustion engine in the primary compression stroke, the secondary fuel is sprayed in the cylinder body of the internal-combustion engine at the moment that the piston of the internal-combustion engine gets away a top dead center of the secondary combustion stroke or in the secondary combustion stroke. In the method, the fuel air ratio of the sum of the primary fuel and the secondary fuel, and the intake air of the air intake stroke is not more than the fuel air ratio in theory of the fuel mixed by the primary fuel and the secondary fuel. In the secondary combustion working method of the six-stroke internal-combustion engine, the problem that the internal-combustion engine has poor consumption performance under high-load working condition is solved, and simultaneously the discharge of harmful tail gas of the internal-combustion engine is greatly reduced.

Description

technical field [0001] The invention relates to a secondary combustion working method of a six-stroke internal combustion engine. Background technique [0002] Usually, in a four-stroke direct-injection internal combustion engine, in the "intake-compression-combustion-exhaust" working cycle, the combustion of the mixture is completed at one time. Because the mixed gas is not easy to mix evenly, it is easy to appear the local over-concentration of the mixed gas and cause smoke phenomenon under heavy load conditions. An improved method is to adopt multi-stage fuel injection, such as diesel engine 5-stage injection, part of the fuel is injected during the combustion process, and as a result, there are many post-combustion parts of the mixture, so that the combustion expansion pressure cannot exert the best work effect. [0003] In the technical development of in-cylinder direct injection engines for many years, people mainly focus on continuously increasing the fuel injection ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a working method for secondary combustion of a six-stroke internal com

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