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Engine fuel cylinder inner direct ejection device

A technology for injection devices and engines, which is applied in the direction of fuel injection devices, engine components, machines/engines, etc. It can solve problems such as vaporization, oil dripping from fuel injectors, and low lubrication, so as to improve response characteristics, prevent oil dripping, and ensure The effect of accuracy

Inactive Publication Date: 2010-06-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Engine fuel cylinder inner direct ejection device
  • Engine fuel cylinder inner direct ejection device
  • Engine fuel cylinder inner direct ejection device

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Embodiment Construction

[0015] Such as figure 1 , 2 As shown, the direct fuel injection device in the engine cylinder includes a high-speed solenoid valve for back pressure control, a fuel control solenoid valve, a fuel injector body, and a fuel injector. In the upper part, the injector nozzle is fixed on the lower part of the injector body. The injector body 17 includes the working oil return passage 8, the working oil inlet passage 12, the high pressure oil passage 24 of the injector body, the fuel oil inlet passage 27, and the fuel oil inlet passage 27. The oil return channel 28, the back pressure chamber 36, the upper part of the injector body 17 is provided with a double spool fixed cavity and the single spool fixed cavity, the lower part of the injector body 17 is provided with a needle valve fixed cavity, the two sides of the injector body 17 There are working oil return passage 8, working oil inlet passage 12, fuel oil inlet passage 27, and fuel oil return passage 28 respectively. The high-p...

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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 theoil 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 thecylinder; 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 preventingthe 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 ofoil injection metering.

Description

technical field [0001] The invention relates to an engine fuel in-cylinder direct injection device, especially with the function of injection back pressure control, which is mainly used in an internal combustion engine liquid fuel in-cylinder direct injection system for the purpose of realizing accurate fuel injection control. Background technique [0002] In recent years, with the aggravation of the energy crisis and increasingly stringent emission regulations, fuels such as gasoline and liquefied petroleum gas (LPG) are directly injected into the cylinder, and the traditional oil-gas mixing mechanism is changed to achieve lean or even ultra-lean combustion. Higher fuel economy and emission levels and other performances have become an important trend in the development of fuel injection technology for internal combustion engines. [0003] The development of electronically controlled common rail injection technology for diesel engines can be used as a reference for other fue...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M61/18
Inventor 何文华田素恒刘建军
Owner ZHEJIANG UNIV
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