JPS6030328U

JPS6030328U - Diesel engine fuel injection timing adjustment device

Info

Publication number: JPS6030328U
Application number: JP12208283U
Authority: JP
Inventors: 川越　道男; 修菱沼
Original assignee: トヨタ自動車株式会社; 株式会社デンソー
Priority date: 1983-08-05
Filing date: 1983-08-05
Publication date: 1985-03-01

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図は本考案の一実施例を示す構成図、第２図はエン
ジン負荷と大気圧との関係から定められた負圧特性図、
第３図は負圧室負圧と燃料噴射時期補正量との関係を示
す線図である。１０・・・ポンプハウジング、１４．３０・・・絞り、
１６・・・高圧室、１８・・・タイマピストン、２２・
・・低圧室、３４・・・圧力調整弁、３８・・・圧力室
、４４・・・負圧室、４８・・・負圧制御弁、５０・・
・負圧源、５２・・・コントローラ、５４・・・大気圧
センサ、５６・・・負荷センサ。Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2 is a negative pressure characteristic diagram determined from the relationship between engine load and atmospheric pressure,
FIG. 3 is a diagram showing the relationship between the negative pressure in the negative pressure chamber and the fuel injection timing correction amount. 10... Pump housing, 14.30... Throttle,
16... High pressure chamber, 18... Timer piston, 22...
...Low pressure chamber, 34...Pressure adjustment valve, 38...Pressure chamber, 44...Negative pressure chamber, 48...Negative pressure control valve, 50...
- Negative pressure source, 52... Controller, 54... Atmospheric pressure sensor, 56... Load sensor.

Claims

[Scope of utility model registration request]

The cylinder chamber is divided into a high-pressure chamber to which fuel is supplied from the fuel pump and a low-pressure chamber adjacent to the high-pressure chamber with a piston in between, which urges the piston toward the high-pressure chamber. In a fuel injection timing adjustment device for a diesel engine, the piston is moved 'MtJJ according to the position of the piston, and the injection timing of the plunger for distributing and pressure-feeding fuel to each cylinder of the diesel engine is adjusted according to the position of the piston.
A first communication path that communicates between the fuel supply path that supplies fuel to the high pressure chamber and the low pressure chamber, a second communication path that communicates the low pressure chamber and the fuel supply path on the upstream side of the fuel pump, and A pressure regulating valve that closes the passage and opens a second communication passage using negative pressure, and a valve drive device that applies negative pressure to the pressure regulating valve that gradually becomes high negative pressure as atmospheric pressure and engine load decrease. In preparation, when the atmospheric pressure drops, the pressure regulating valve is opened and closed by negative pressure according to the engine load to correct the pressure difference between the high pressure chamber and the low pressure chamber, and the fuel injection timing is advanced in accordance with this correction. A fuel injection timing adjustment device for a diesel engine, characterized by the following.