Lean burn natural gas engine gas injection method
An injection method and technology of natural gas, applied in combustion engines, internal combustion piston engines, engine components, etc., can solve problems such as slow flame propagation speed, achieve the effects of improving combustion thermal efficiency, improving ignition stability, and optimizing combustion process
Inactive Publication Date: 2010-10-27
FAW GROUP +1
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Problems solved by technology
However, the shortcoming of slow flame propagation must be properly resolved in order to fully develop the lean-burn technology.
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[0049] Through the experimental research of CA6SE1-21N natural gas engine of China First Automobile Group Corporation, the working process of the original engine at 1450r / min and 100% load condition point was simulated and analyzed. The analysis results show that the original single-injection injection method makes the mixture gas distribution in the cylinder appear lean at the top and rich at the bottom, which is not conducive to the reliable ignition and stable combustion of the mixture gas, and is also not conducive to increasing the lean limit.
[0050] Local stratification, that is, based on a large-scale homogeneous mixture, implement a small-scale local enrichment of the mixture around the spark plug. This distribution of the mixture can not only ensure stable ignition, but also increase the lean limit.
[0051] The two-spray method proposed by the present invention can achieve this local stratification.
[0052] Using the commercial numerical simulation software STAR-C...
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The invention discloses a method for injecting the gas of lean burn natural gas engine. The invention aims at overcoming the problem that the gas mixture concentration in the cylinder at the igniting time is upper thin and lower dense when using single gas injection method in the prior art. The invention divides the gas required by each work cycle of the natural gas engine into two parts, and injects the gas into the cylinder for a first time and a second time according to proportion, speed, and time, the ration of the first injected natural gas and the second injected natural gas which form homogeneous mixed gas in large range in the cylinder is 4.7:1, the speed ration is 1:2, the injection starting time is between 30 DEG crankshaft rotation angle before air intake top dead center and 30DEG crankshaft rotation angle after air intake top dead center; the ratio of the second injected natural gas and the first injected natural gas which realize the local layer for mixed gas concentration in the cylinder is 1:4.7, the speed ration is 2:1, and the injection starting time is between 100 DEG to 160 DEG crankshaft rotation angles after air intake top dead center.
Description
technical field [0001] The invention relates to a gas injection method of a natural gas engine, more specifically, it relates to a gas injection method of a lean-burn natural gas engine. Background technique [0002] The lack of energy and the deterioration of the global environment have become the focus of attention in the world. With the advancement of science and technology and the development of society, the number of automobiles in the world has increased year by year, and it has taken up a large amount of limited oil reserve resources, and at the same time increased the degree of pollution to the atmosphere. "Energy saving and emission reduction" is the basic national policy of our country; it is a major measure to implement the scientific outlook on development and build a harmonious socialist society. To this end, the State Council issued the "National Environmental Protection "Eleventh Five-Year" Plan" on November 22, 2007, which clearly pointed out that "vigorousl...
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IPC IPC(8): F02M21/02
CPCY02T10/32Y02T10/30
Inventor 窦慧莉刘忠长王忠恕韩永强葛思非吕品许允
Owner FAW GROUP