Natural gas engine combustion organization method adopting manifold multiple-injection, pre-combustion chamber low-pressure gas supply and diesel oil micro-jetting ignition

Abstract

The invention aims at providing a natural gas engine combustion organization method adopting manifold multiple-injection, pre-combustion chamber low-pressure gas supply and diesel oil micro-jetting ignition. A low-pressure air spraying valve is arranged on each cylinder air inlet manifold, under different stations, the jetting frequency and timing of the low-pressure air spraying valve are controlled, and therefore natural gas forms different degrees of concentration gradient distributions in a cylinder; a one-way air supply valve is arranged on the top of a pre-combustion chamber, a suction stroke supplies air to the pre-combustion chamber, an oil injector is arranged above the right of the pre-combustion chamber in an inclined manner, a compressor stroke does not spray the micro amount of diesel oil to the pre-combustion chamber, the diesel oil is subjected to spontaneous combustion to ignite the mixed air in the diesel oil, and high-temperature gas is injected into a main combustionchamber to ignite the mixed air in the cylinder. Through adjusting of the air supply pressure of a one-way valve, the amount of natural gas in the pre-combustion chamber is adjusted, the ignition stability under different stations is ensured, through manifold multiple-injection, in-cylinder lean mixture concentration layering and rapid combustion can be achieved, and the economy and emission of the engine can be improved.

Description

technical field [0001] The invention relates to a combustion control method, in particular to a natural gas engine combustion control method. Background technique [0002] At present, resources such as traditional oil are gradually being exhausted. At the same time, the environmental problems caused by the combustion of traditional fuels are increasingly being paid attention to by countries all over the world. It is imperative to find new alternative energy sources. As a green fuel with abundant reserves and clean emissions, the research on natural gas has attracted extensive attention from all over the world. [0003] The premixed intake air of natural gas engine is divided into single-point injection of intake manifold and multi-point injection of intake manifold. The single-point injection of intake manifold supplies air continuously throughout the engine cycle, which will cause a large amount of gas in the valve overlap angle. The escape of natural gas is not conducive ...

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Problems solved by technology

[0004] In order to make better use of the emission advantages of natural gas, natural gas engines usually work under a leaner mixture, but the main component of natural gas, methane, has a higher ignition point, slower flame propagation speed and longer combustion duration during the combustion process, which is easy to produce Large cycle fluctuations, lean mixtures are also prone to misfire and knocking. In order

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