Natural gas engine combustion organization method with precombustion chamber low-pressure air supply and in-cylinder high-pressure direct injection functions

Abstract

The invention aims to provide a natural gas engine combustion organization method with precombustion chamber low-pressure air supply and in-cylinder high-pressure direct injection functions. The natural gas engine combustion organization method is characterized in that a high-pressure gas injecting device is mounted on a cylinder cover, and gas injected at the tail end of compression stroke formsconcentration gradient distribution in a cylinder; a precombustion chamber is positioned right above a main combustion chamber, and a sparking plug is obliquely mounted on the left above the precombustion chamber; a low-pressure one-way air supply valve is mounted at the top of the precombustion chamber and is used for supplying air into the precombustion chamber during the intake stroke, such airand air pushed into the precombustion chamber during the compression stroke form a combustible gas mixture, the combustible gas mixture is ignited by the sparking plug, and flames enter a gas mixturein an ignition cylinder of the main combustion chamber; the air supply pressure of the one-way air supply valve is controlled at 4-6 bar during a low load and at 8-10 bar during a high load. The natural gas engine combustion organization method has the advantages that the ignition stability in different operation conditions can be guaranteed through adjustment of the air supply pressure in the one-way valve, and concentration stratification and rapid combustion of the thin gas mixture in the cylinder are achieved through in-cylinder direct injection, so that an engine is more economical and higher in exhaust performance.

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] Natural gas is a green fuel with abundant reserves and clean emissions. Using it as a substitute fuel for petroleum in the engine field can effectively improve the current plight of energy shortage and environmental pollution. [0003] Natural gas engines can be divided into gas supply outside the cylinder and gas supply inside the cylinder according to the gas supply method. The gas supply method outside the cylinder is divided into single-point intake in the intake manifold and multi-point intake in the intake manifold. The single-point intake method will not work Avoiding a large amount of natural gas escaping will not only cause a large amount of hydrocarbon emissions, but also is not conducive to improving fuel economy. Although the multi-point intake method can reduce natural gas escape, this method ...

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Problems solved by technology

However, these patents did not conduct detailed studies on the formation of the mixture in the pre-chamber and the main combustion chamber, the rational organization of combustion, and the stable propagation of the flame in the pre-chamber to the main combustion chamber.

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