JPS5988265U

JPS5988265U - Internal combustion engine fuel injection system

Info

Publication number: JPS5988265U
Application number: JP18367782U
Authority: JP
Inventors: 豊昭中川
Original assignee: 日産自動車株式会社
Priority date: 1982-12-06
Filing date: 1982-12-06
Publication date: 1984-06-14

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図は燃料噴射装置として従来のユニットインジェク
タの例を示す縦断面図、第２図は本考案の一実施例を示
すユニットインジェクタの縦断面図、第３図は同上の制
御例を示すグラフで、Ａはカムリフト曲線図、Ｂは電磁
開閉弁５０の駆動電圧制御例を示す図、Ｃは同上によっ
てなされたパイロット噴射及び主噴射の噴射率特性図で
ある。１１・・・ユニットインジェクタ、１２・・・プランジ
ャ、１３・・・カム機構、１５・・・ポンプ室、１６・
・・噴射燃料通路、１７・・・燃料通路、２２・・・圧
力室、２３・Φ・ニードルバルブ、２４０・バルブスプ
リング、３１・・・噴口、５０・・・電磁開閉弁、５５
・・・制御装置。Fig. 1 is a longitudinal sectional view showing an example of a conventional unit injector as a fuel injection device, Fig. 2 is a longitudinal sectional view of a unit injector showing an embodiment of the present invention, and Fig. 3 is a graph showing an example of the same control. Here, A is a cam lift curve diagram, B is a diagram showing an example of drive voltage control of the electromagnetic on-off valve 50, and C is an injection rate characteristic diagram of pilot injection and main injection made according to the above. DESCRIPTION OF SYMBOLS 11... Unit injector, 12... Plunger, 13... Cam mechanism, 15... Pump chamber, 16...
... Injection fuel passage, 17... Fuel passage, 22... Pressure chamber, 23. Φ needle valve, 240. Valve spring, 31.
···Control device.

Claims

[Scope of utility model registration request]

The pump part is equipped with a plunger that reciprocates based on a cam mechanism that rotates in synchronization with the rotation of the internal combustion engine to draw fuel into the pump chamber and forcefully send it to the nozzle, and the nozzle is normally closed by the force of a spring. In the fuel system, the cam mechanism is operated during the pressure feeding stroke of the plunger. A cam profile is formed to perform two-stage fuel compression, while an electromagnetic on-off valve is installed in a passage connecting the pump chamber to the low-pressure fuel side, and an electromagnetic on-off valve is installed to input the operating state of the engine and adjust the cam profile according to the operating state. 1. A fuel injection device for an internal combustion engine, comprising: a control device that applies an opening/closing signal to an electromagnetic opening/closing valve to perform main injection and pilot injection prior to the main injection.