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Bypass type electronic fuel injector

An electronically controlled fuel injection and fuel injector technology, which is applied to machines/engines, fuel injection devices, engine components, etc., can solve the problems of fuel leakage, static pressure difference of fuel injectors, etc., so as to improve the fuel injection process and improve the pressure. Fluctuation, reducing the effect of mutual interference

Pending Publication Date: 2017-05-31
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the presence of the control plunger causes a static pressure difference in the injectors, resulting in static leakage of fuel

Method used

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  • Bypass type electronic fuel injector
  • Bypass type electronic fuel injector
  • Bypass type electronic fuel injector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0021] combine Figure 1-5 , The bypass electronically controlled fuel injector of the present invention includes a fuel injector head 1 , a restrictor valve assembly 3 , a solenoid valve assembly 5 , a needle valve assembly 6 , a nozzle 9 , a tight cap 10 , and a fuel injector body 11 . The fuel injector head 1 is mounted on the fuel injector body 11 through threaded fitting connection, and is sealed by the sealing ring 2 placed on the fuel injector body 11 . A main oil inlet hole 13 is arranged in the injector head 1 and communicates with the pressure accumulator chamber 12 in the injector body 11 . A restrictor valve assembly 3 is arranged below the accumulator chamber 12 . The flow limiting valve assembly 3 is installed inside the fuel injector body 11, and its main structure includes a retaining ring 14, a damping spring 15, a ball valve 17, a support contr...

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PUM

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Abstract

The invention aims at providing a bypass type electronic fuel injector which comprises a fuel injector head, a fuel injector body, a flow limiting valve assembly, a solenoid valve assembly, a cap nut, a needle valve assembly, a nozzle and other components. A pressure storage cavity is formed in the fuel injector body and communicates with a main fuel inlet and the flow limiting valve assembly, and it can be guaranteed that during large-pulse-width fuel injection, the fuel injection processes of all cylinders are stable. The flow limiting valve assembly is mounted below the pressure storage cavity, and abnormal continuous fuel injection is avoided. The solenoid valve assembly and the needle valve assembly are sequentially arranged below the flow limiting valve assembly and connected together through the cap nut. A control sliding block is arranged in a control cavity and is in contact with a middle block, and the functions of relieving the fuel injection speed in the initial injection period and accelerating needle valve sitting responses are achieved. Hydraulic pressure in the nozzle part is balanced, the static pressure difference is avoided, and the function that the fuel injector is free of static leakage is achieved.

Description

technical field [0001] The invention relates to a fuel injection device, in particular to a high-pressure common rail fuel injection device. Background technique [0002] As the requirements for fuel economy and emission characteristics of the engine are getting higher and higher, the emission limitation mainly lies in two aspects of nitrogen oxides and particulate matter. In order to reduce the emission of nitrogen oxides, it is required to control the opening of the needle valve at the beginning of fuel injection, so that there is a low fuel injection rate and a gently rising fuel injection rate during the ignition delay period, which is beneficial to ensure the fuel injection process and Consistency in the shape of the fuel injection rate; at the end of the fuel injection, the closing speed of the needle valve is required to be fast, which is beneficial to the rapid pressure build-up of the system. That is to say, it can realize the characteristic curve of fuel injection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M47/02F02M61/10F02M61/18F02M63/00
CPCF02M47/027F02M61/10F02M61/1893F02M63/0017F02M63/0036F02M63/0049F02M63/007
Inventor 范立云张孝勇宋恩哲姚崇
Owner HARBIN ENG UNIV
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