Combustion organization method with multiple injection, low pressure air feed in pre-combustion chamber and micro spray ignition of diesel oil for natural gas engine

Abstract

The invention aims at providing a combustion organization method with multiple injection, low pressure air feed in a pre-combustion chamber and micro spray ignition of diesel oil for a natural gas engine. A one-way air feed valve injects natural gas to the pre-combustion chamber in an air inlet stroke; a high pressure natural gas injection valve sprays natural gas into a cylinder directly for multiple times, and gas mixture layers in different concentration gradient are formed in the cylinder under different engine loads; and the pre-combustion chamber is positioned in the middle of a cylindercover, a fuel injector sprays a small amount of diesel oil into the pre-combustion chamber near a top dead center of compression, the diesel oil is self ignited and ignites a gas mixture in the pre-combustion chamber, and high-temperature combustion gas is injected out of the pre-combustion chamber and ignites the gas mixture in the cylinder. The pressure of the one-way air feed valve is regulated to control the concentration of natural gas in the pre-combustion chamber; the injection frequency and quantity of the high pressure natural gas injection valve are adjusted to control the concentration gradient of the gas mixture in the cylinder; and the injection quantity and correction injection time of the diesel oil in the pre-combustion chamber are adjusted to realize reliable ignition andhigh-efficiency low-discharge combustion of the natural gas engine in different conditions.

Description

technical field [0001] The invention relates to an engine combustion control method, in particular to a natural gas engine combustion control method. Background technique [0002] In recent years, with the depletion of oil and other fuels, countries all over the world are looking for new energy sources that can replace traditional fuels. Natural gas is rich in reserves, low in price, and has the advantages of high efficiency and cleanliness, so it has been valued by countries all over the world. Although natural gas has the advantages of high efficiency, cleanliness and low price, since the ignition point of natural gas is higher than that of gasoline, diesel and other fuels, the energy required to ignite natural gas is relatively high, and the flame propagation speed is relatively low, thereby reducing the combustion efficiency of the engine , affecting the emission and power of the engine. [0003] Large natural gas engines are equipped with a pre-combustion chamber, mos...

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Problems solved by technology

However, high-pressure single injection cannot achieve multi-gradient stratified combustion of the mixture in the cylinder under different working conditions, and there is still the problem of insufficient combustion.

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