Fuel injection manner of ignition chamber type direct injection gasoline engine

Abstract

A fuel injection manner of an ignition chamber type direct injection gasoline engine belongs to the field of engine fuel injection as well as mixed gas formation and combustion. The fuel injection manner is that the direction of fuel nozzle holes arranged outside an ignition chamber is not directly aligned with the opening of the ignition chamber, but at least one of the injection hole points below the opening of the ignition chamber to avoid mist spray from entering into the ignition chamber directly, so that the mist spray is adhered on the wall face of the ignition chamber to form a fuel film; at the same time, one time or more than one time of injection is adopted, and the concentration of the mixed gas is ensured to be within ignitable range under various working conditions by using the action of gas inlet flow and gas compression and extrusion, thus avoiding fuel film formation in the ignition chamber, ensuring the ignition to be reliable and the flame spreading to be fast and stable. The reliable ignition and fast and stable flame spreading cause the engine to run stably with higher compression ratio and air-fuel ratio and lower idle speed, thus the vehicle can generate more obvious effect of saving energy during running under urban working condition.

Description

technical field [0001] The invention relates to a fuel injection mode of an ignition chamber type direct-injection gasoline engine, which belongs to the fields of engine fuel injection, mixed gas formation and combustion. Background technique [0002] Direct injection gasoline engine with lean burn strategy has become one of the important research topics in the field of engine combustion because of its good fuel economy and transient response. Because the mixture of this kind of engine is relatively thin, the engine has problems such as difficult ignition and unstable combustion, resulting in power loss and increased emissions. Contents of the invention [0003] In order to ensure reliable ignition and improve the stability of flame propagation, further expand the lean combustion range of direct injection gasoline engines in cylinders, improve thermal efficiency, and reduce emissions, the present invention proposes a fuel injection method for ignition chamber direct inject...

AI Technical Summary

Problems solved by technology

Because the mixed gas of this engine is relatively thin, the engine has problems such as difficulty in ignition and unstable combustion, resulting in power loss and increased emissions.

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