JPS6014277U

JPS6014277U - fuel injection control device

Info

Publication number: JPS6014277U
Application number: JP10642583U
Authority: JP
Inventors: 三輪　博道
Original assignee: 日産自動車株式会社
Priority date: 1983-07-08
Filing date: 1983-07-08
Publication date: 1985-01-30

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 drawings]

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、第３図は従来
装置の噴射圧力、噴射率を示す特性図である。第４図は
本考案の第１実施例のユニットインジェクタの概略構成
図、第５図は特性図である。４・・・プランジャ、７・・・圧力室、８ａ、　　８ｂ
・・・燃料供給通路、９・・・燃料通路、１０・・・ノ
ズル、１１・・・ニードル室、１２−・・二−ドルバル
フ゛、１３二・・スプリング、１６・・・スプリング室
、２８ａ・・・燃料逃し通路、４０・・・電磁弁、５１
・・・制御弁、５３・・・弁体、５４・・・スプリング
、５６・・・謂、５９・・・通路、６０・・・チェック
弁。FIG. 1 is a longitudinal sectional view of a unit injector used in a conventional device, FIG. 2 is a sectional view of a main part of FIG. 1, and FIG. 3 is a characteristic diagram showing the injection pressure and injection rate of the conventional device. FIG. 4 is a schematic configuration diagram of a unit injector according to the first embodiment of the present invention, and FIG. 5 is a characteristic diagram. 4...Plunger, 7...Pressure chamber, 8a, 8b
...Fuel supply passage, 9...Fuel passage, 10...Nozzle, 11...Needle chamber, 12-...Second valve, 132...Spring, 16...Spring chamber, 28a... ... Fuel relief passage, 40 ... Solenoid valve, 51
...control valve, 53...valve body, 54...spring, 56...so-called, 59...passage, 60...check valve.

Claims

[Scope of utility model registration request]

The needle valve is biased in the closing direction by a plunger that reciprocates in synchronization with the engine, a pressure chamber formed at one end of the plunger, and an elastic member normally provided in the spring chamber. , a nozzle that opens the needle valve by lifting it in the valve-opening direction when fuel pressure from the pressure chamber exceeds a predetermined value, and a valve device that recesses and closes the fuel supply passage communicating with the pressure chamber depending on the operating state of the engine. In the fuel injection control device comprising: a fuel relief passage where the spring chamber joins the fuel supply passage upstream of the valve device; and a fuel supply passage upstream of the confluence of the fuel relief passage, the fuel pressure from the pressure chamber is set to a predetermined value or higher. 1. A fuel injection control device comprising: a control valve device that shuts off the fuel injection.