Fuel injecting strategy of ignition chamber type direct injection gasoline machine

Abstract

The invention discloses a fuel injecting method of an ignition chamber type direct injection gasoline machine, belonging to the field of engine fuel injection and mixed gas forming and combustion. Due to the adoption of two fuel nozzles of needle valves, a main combustion fuel chamber and the injection amount of the ignition chamber are easy to control, and the equivalent ratio of mixed gas in the ignition chamber is controlled in a range of easy ignition, so that the ignition is stable and reliable and the flame spread is quick and stable. The ignition chamber ensures that the distribution of mixed gas in the main combustion chamber is only needed to be considered on the design of a main combustion chamber, thereby reducing the consider on the mixed gas concentration near a spark plug, simplifying the design of the main combustion chamber and laying a foundation for more reasonable combustion for the organization. The mixed gas in the main combustion chamber is easier to combust, so that the thin combustion range of the engine is beneficial to being further enlarged, the internal combustion speed in the cylinder can be improved and the heat efficiency of the engine is improved. The engine can stably operate at lower idle speed by reliable ignition and stable and quick flame spread, so that vehicles take remarkable oil-saving effect during driving under city work conditions.

Description

technical field [0001] The invention relates to a fuel injection method for 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] In-cylinder direct-injection gasoline engine using lean combustion method 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 c...

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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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