Fuel oil injection method of ignition chamber direct-spraying petrol engine

Abstract

The invention relates to a fuel oil injection method of an ignition chamber direct injection gasoline engine, which belongs to the field of engine fuel injection, mixed gas formation and burning. The fuel injection method adopts once or more than once injection; the circulating injection is the controlled concentration of the ignition chamber when the air flow in a cylinder is weak or the controlled concentration plus the main injection when the air flow in the cylinder is strong; the controlled concentration of the ignition chamber is changed as different fuel pressed in the mixed gas in the ignition chamber under different working conditions, to make sure the air-fuel ratio of the mixed gas inside the ignition chamber is within an easily ignited scope; in this way, the ignition is stable and reliable, and the flame is quickly and stably spread. The mixed gas in a main burning chamber is more easily inflamed, which is good for further extending the lean burn scope of the engine and speeding up the burning speed, and improves the thermal efficiency of the engine. The reliable ignition as well as the stable and quick flame spread can also make sure that the engine stably runs at lower idle rotating speed, so that quite obvious energy saving effect is produced when a vehicle runs in a city.

Description

technical field [0001] The invention relates to a fuel injection method for an ignition chamber direct-injection gasoline engine, which belongs to the fields of engine fuel injection, mixed gas formation and combustion. Background technique [0002] In-cylinder direct injection gasoline engine using 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 direct injection ga...

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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