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

A fuel injection and ignition chamber technology, applied in fuel injection control, mechanical equipment, engine control, etc., can solve the problems of difficult engine ignition, increased emissions, and unstable combustion, and achieve rapid and stable flame propagation, stable and reliable ignition, and The effect of reducing the mixture concentration considerations

Inactive Publication Date: 2008-12-10
DALIAN UNIV OF TECH
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  • Claims
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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.

Method used

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

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Embodiment Construction

[0021] In the embodiment shown in the above drawings, an ignition chamber 4 is arranged on the cylinder head of the direct-injection gasoline engine, and a spark plug 8 is placed therein. The fuel injector is a multi-hole nozzle 3, and the center line of one of the nozzle holes points to the ignition chamber. 4 entrances. Combined with the airflow movement in the engine cylinder, the gasoline electronically controlled injection system is used to perform one or more injections during the period from the closing of the exhaust valve 2 of the engine to the compression top dead center. By selecting the appropriate injection timing, one injection is performed when the airflow is relatively weak Or more than one high-speed injection, each injection of a beam of oil is injected into the ignition chamber, and other oil beams enter the main combustion chamber; according to the working conditions, one or more low-speed injections can be performed when the airflow is relatively strong, be...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/30
Inventor 隆武强田江平付磊王玉冰李峰齐鲲鹏贾立全
Owner DALIAN UNIV OF TECH
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