D-EGR based gasoline engine combustion system

Abstract

The embodiment of the invention provides a D-EGR based gasoline engine combustion system. The D-EGR based gasoline engine combustion system is characterized by comprising a gas compressor, a turbine motor, a main gas inlet pipeline, a first gas inlet pipeline, a second gas inlet pipeline, a gas inlet manifold, a first exhaust pipeline, an exhaust manifold, a first cylinder, a second cylinder, a third cylinder, a fourth cylinder, an EGR mixer and a gas inlet camshaft, wherein the gas inlet camshaft is provided with a first Otto cam used for controlling a gas inlet door of the first cylinder, asecond Otto cam used for controlling a gas inlet door of the second cylinder, a third Otto cam used for controlling a gas inlet door of the third cylinder and a Miller cam used for controlling a gas inlet door of the fourth cylinder, and therefore the Miller cam is utilized for changing the actual compression ratio of the fourth cylinder; knocks of the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are suppressed through sluggishness of combustion products of the fourth cylinder, and therefore the first cylinder, the second cylinder, the third cylinder and thefourth cylinder can adopt the same structure and the same high geometric compression ratio; and the engine manufacturing cost is reduced, and the heat efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency gasoline engines, and in particular relates to a gasoline engine combustion system based on D-EGR. Background technique [0002] From 1916 to the fourth stage in 1919, the average fuel consumption limit of Chinese light vehicle enterprises will be gradually tightened from 6.9L / (100km) to 5.0L / (100km). In 1925, the average fuel consumption of Chinese light vehicle enterprises was predicted to be 4.0L / (100km). Hybrid passenger vehicles are the mainstream technology route to meet future fuel consumption and emission regulations, and high-efficiency gasoline engines are one of the key technologies for hybrid powertrains. [0003] The Southwest Research Institute proposed a split-manifold D-EGR gasoline engine, which uses the uncombusted gas in the fourth cylinder to effectively avoid the knocking of the first to third cylinders. In terms of performance, the effective thermal efficiency of the...

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Problems solved by technology

[0005] The Southwest Research Institute proposed that in the split-manifold D-EGR gasoline engine, there is a large difference in the geometric compression ratios of the first to third cylinders and the fourth cylinder, which in turn causes the cylinder heads and combustion chambers of the first to third cylinders and fourth cylinders There are differences in shape, piston top surface structure and injector layout, which will increase the manufacturing cost of gasoline engines; at the same time, the Southwest Research Institute proposed that the fourth cylinder in the split manifold D-EGR gasoline engine adopts a low compression ratio, which also It is not conducive to the improvement of the effective thermal efficiency of the whole machine

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