JPS6015965U

JPS6015965U - fuel injection control device

Info

Publication number: JPS6015965U
Application number: JP10869183U
Authority: JP
Inventors: 明信森山
Original assignee: 日産自動車株式会社
Priority date: 1983-07-13
Filing date: 1983-07-13
Publication date: 1985-02-02

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来装置に使用されるユニットインジェクタの
縦断面図、第２図は第１図の要部断面図である。第３図
は本考案の第１実施例のユニットインジェクタの要部概
略構成図、第４図は第３図の要部拡大構成図、第５図は
作用説明図である。４・・・プランジャ、７・・・圧力室、３ａ、　　８ｂ
・・・燃料供給通路、９・・・燃料通路１，１０・・・
ノズル、１１・・・ニードル室、１２・・・・・・ニー
ドルバルブ、１３・・・スプリング、４０・・・電磁弁
、４３・・・電磁弁の弁体、４９・・・ソレノイド、５
１・・・スプリング、６０・・・逆止弁、７１・・・ピ
ストン、７２・・・背圧室、７３・・・背圧通路、８０
・・・背圧制御弁、８１・・・背圧制御弁の弁体、８８
・・・段付小径部。FIG. 1 is a longitudinal cross-sectional view of a unit injector used in a conventional device, and FIG. 2 is a cross-sectional view of the main part of FIG. 1. FIG. 3 is a schematic diagram of the essential parts of a unit injector according to the first embodiment of the present invention, FIG. 4 is an enlarged diagram of the essential parts of FIG. 3, and FIG. 5 is an explanatory diagram of the operation. 4... Plunger, 7... Pressure chamber, 3a, 8b
...Fuel supply passage, 9...Fuel passage 1, 10...
Nozzle, 11... Needle chamber, 12... Needle valve, 13... Spring, 40... Solenoid valve, 43... Valve body of solenoid valve, 49... Solenoid, 5
DESCRIPTION OF SYMBOLS 1... Spring, 60... Check valve, 71... Piston, 72... Back pressure chamber, 73... Back pressure passage, 80
... Back pressure control valve, 81 ... Valve body of back pressure control valve, 88
...Stepped small diameter section.

Claims

[Scope of utility model registration request]

A plunger that reciprocates in synchronization with the engine, a pressure chamber formed facing one end of this plunger, and a needle valve that is normally biased in the closing direction by an elastic member and closed, and a predetermined amount of water from the pressure chamber is A nozzle that lifts the needle valve in the valve-opening direction when the fuel pressure exceeds the specified value is interposed between the nozzle and the fuel supply passage that communicates with the pressure chamber, and the valve body is normally urged in the valve-opening direction by an elastic member. In a fuel injection control device equipped with a valve device that opens the valve and lifts the valve body in the valve-closing direction by a drive current supplied to the solenoid depending on the operating state of the engine to close the valve, when the solenoid is demagnetized, the valve device A check valve device that shuts off the fuel supply passage upstream of the valve device by the fuel pressure escaping through the check valve device, and the fuel pressure trapped by this check valve device is guided, and a piston that interlocks with the needle valve is slidably fitted. A fuel injection control device comprising a back pressure chamber and a back pressure control valve device that lifts the back pressure chamber fuel pressure at a predetermined value or higher and releases the fuel pressure in the back pressure chamber after the predetermined lift.