Natural gas engine structure and combustion organization method thereof

Abstract

The invention provides a natural gas engine structure and a combustion organization method of the natural gas engine structure. The natural gas engine structure comprises a cylinder cover, a cylinder and a piston. A spiral intake channel, a low-pressure one-way gas supply valve and a spark plug are installed in the air cylinder cover. A pre-combustion chamber is arranged in the cylinder cover. An outlet of the low-pressure one-way gas supply valve communicates with the pre-combustion chamber. The end of the spark plug is located in the pre-combustion chamber. The portion, located outside the cylinder cover, of the spiral intake channel is provided with a low-pressure natural gas injection valve. The spiral intake channel comprises a gas channel inlet, a gas channel outlet and a spiral gas channel communicating with the gas channel inlet and the gas channel outlet. The spiral gas channel comprises a tangent three-dimensional circular arc body. According to the natural gas engine structure, the gas intake channel conducts low-pressure injection to form pre-mixed gas, by adjusting the injection timing, the number of times of injection and the injection amount of the low-pressure natural gas injection valve, the concentration of the mixed gas in the cylinder is controlled to be in gradient distribution, and then stratified combustion and homogeneous combustion are achieved; and the spiral intake channel improves the vortex intensity in the cylinder, and therefore the combustion efficiency is improved.

Description

technical field [0001] The invention relates to an engine and a control method, in particular to a natural gas engine and a control method thereof. Background technique [0002] Due to the increasing depletion of traditional petroleum fuels, natural gas, an efficient and clean fuel, has gradually 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. Affects engine emissions and power. [0003] Typical electronically controlled multi-point injection natural gas engines, such as the OM352 natural gas engine modified by the American SPI company for Benz, and the MAN28 / 32 natural gas engine of the German MAN company, etc., inject natural ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a natural gas engine structure and its combustion organization method to solve the problem of relatively poor power, economy and emission of natural gas under different working conditions

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