Engine fuel cylinder inner direct ejection device

Abstract

The invention discloses a direct injection device in an engine fuel cylinder. The direct injection device comprises a backpressure control high-speed electromagnetic valve, a fuel control electromagnetic valve, an oil injector body and an oil injection nozzle; the backpressure control high-speed electromagnetic valve and the fuel control electromagnetic valve are arranged on the upper part of the oil injector body; and the oil injection nozzle is fixed on the lower part of the oil injection body. As the direct injection device is provided with a backpressure control device, the direct injection device can realize the rapid closing of a pin valve and improve the response characteristic of the pin valve, thereby realizing multisection injection and other flexible injection strategies; a backpressure control oil channel can adopt separate working oil with good lubrication and certain viscosity; therefore, the injection device can be used for injecting various gases and liquid fuels to the cylinder; when an engine is in a working stroke of no oil injection, the fuel control electromagnetic valve is closed in order that a pressure chamber exists no high-voltage fuel, thereby preventing the occurrence of the oil dripping phenomenon caused by poor seal, in particular preventing liquid gas fuel from being gasified in the pressure chamber caused by poor seal and ensuring the accuracy of oil injection metering.

Description

technical field [0001] The invention relates to a direct injection device in an engine fuel cylinder, especially with the function of injection back pressure control. Background technique [0002] In recent years, with the aggravation of the energy crisis and the increasingly strict emission regulations, by directly injecting fuel, such as gasoline, liquefied petroleum gas (LPG), etc. into the cylinder, changing the traditional oil-gas mixing mechanism to achieve lean or even ultra-lean combustion. Higher fuel economy and emission levels and other properties have become an important trend in the development of current internal combustion engine fuel injection technology. [0003] The development of diesel electronically controlled common rail injection technology can be used as a reference for in-cylinder direct injection technology of other fuels. At present, diesel electronically controlled common rail injectors are mainly based on injectors controlled by high-speed solen...

AI Technical Summary

Problems solved by technology

Although this type of injector can realize injection back pressure control, because there is always high-pressure fuel in the pressure chamber of the injector when the engine is in the non-injection working stroke, when it is used for low-viscosity, low-lubrication fuel, Due to poor sealing and lubrication, the fuel injector will produce a certain amount of oil dripping, especially when it is used for liquefied gas fuel such as liquefied petroleum gas, when the sealing is not good, it will cause vaporization, which will affect the accuracy of fuel injection metering

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