Pre-combustion ignition device, combustion device and engine

Abstract

The pre-combustion ignition device comprises a pre-combustion chamber, a spark plug, an ejector, a first pressure sensor, a second pressure sensor and an electric control unit, the spark plug and the ejector are arranged on the pre-combustion chamber, and an air inlet, an oil inlet, an ejection opening and a containing cavity are formed in the ejector; the first pressure sensor is used for detecting the pressure of the pre-combustion chamber and feeding back the pressure to the electric control unit. The second pressure sensor is used for detecting the pressure of mixed gas of air and fuel oil in the containing cavity and feeding back the pressure to the electric control unit. And when the preset injection moment of the injector is reached and the electric control unit judges that the ratio of the pressure of the mixed gas in the containing cavity to the pressure of the pre-combustion chamber is 2 or above, the injection opening is controlled to be opened, so that the mixed gas is injected into the pre-combustion chamber through the injection opening. The flow velocity of the mixed gas is kept unchanged, and the total injection amount of the mixed gas can be accurately controlled by controlling the injection pulse width, so that the equivalence ratio of the mixed gas in the injector can be controlled, and the combustion stability is improved.

Description

technical field [0001] The invention belongs to the technical field of automobile engines, in particular to a pre-ignition ignition device, a combustion device and an engine. Background technique [0002] When the engine starts, it needs to be ignited by the ignition device to ignite the mixture of air and fuel. The ignition device not only affects the power, economy and emission performance of the engine, but also determines whether the engine can work normally. [0003] In recent years, active pre-chamber ignition has been used on more and more engines in the face of increasingly stringent fuel consumption and emission regulations. The ignition device is equipped with a spark plug and an injector on the pre-combustion chamber at the same time, which can ignite stably and quickly, realize ultra-lean combustion with lambda>2.0, and have stable combustion, thereby significantly reducing combustion loss. But this ignition device also has some problems: 1) The ventilation ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in view of the existing active pre-combustion chamber ignition system, the pressure in the pre-combustion chamber varies greatly, resulting in the inability to accurately control the injection volume of the mixed gas, resulting in unstable ignition and combustion of the engine. A kind of pre-ignition ignition device, combustion device and engine

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