JPH0414764U

JPH0414764U -

Info

Publication number: JPH0414764U
Application number: JP5577890U
Authority: JP
Priority date: 1990-05-28
Filing date: 1990-05-28
Publication date: 1992-02-06

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す燃料噴射装置
の概略図、第２図はソレノイドバルブの要部断面
図、第３図は先行技術による燃料噴射装置、第４
図は第一燃圧レギユレータにおけるインテークマ
ニホールド圧力と燃圧Ｐ_１との関係を示す図、第
５図はエンジン回転数に応じたパルス信号の周期
を示す図、第６図は第３図に示された第一ソレノ
イドバルブの要部断面図、第７図はインテークマ
ニホールド圧力とエンジン回転数に応じた調整燃
圧Ｐ_４を示す図、第８図は調整燃圧Ｐ_４と上流室
の燃圧Ｐ_５との関係を示す図、第９図は差圧Ｐ_１−Ｐ_５と各燃料流量との関係を示す図である。３……第一燃圧レギユレータ、７……第二燃圧
レギユレータ、８……燃料通路、２１……第三燃
圧レギユレータ、２６……燃料噴射弁、３６……
ソレノイドバルブ、３７……連絡路、３８ａ……
上流開口、３８ｂ……下流開口、４０……制御バ
ルブ、４０ａ……第一バルブ、４０ｂ……第二バ
ルブ。 FIG. 1 is a schematic diagram of a fuel injection device showing an embodiment of the present invention, FIG.
The figure shows the relationship between the intake manifold pressure and the fuel pressure _P1 in the first fuel pressure regulator, Fig. 5 shows the period of the pulse signal according to the engine speed, and Fig. 6 shows the relationship between the intake manifold pressure and the fuel pressure P1 in the first fuel pressure regulator. A sectional view of the main part of the first solenoid valve, Fig. 7 is a diagram showing the adjusted fuel pressure _P4 according to the intake manifold pressure and engine speed, and Fig. 8 is the relationship between the adjusted fuel pressure _P4 and the fuel pressure _P5 in the upstream chamber. Figure 9 shows the differential pressure P ₁ _-P5 is a diagram showing the relationship between each fuel flow rate. 3...First fuel pressure regulator, 7...Second fuel pressure regulator, 8...Fuel passage, 21...Third fuel pressure regulator, 26...Fuel injection valve, 36...
Solenoid valve, 37... Connection path, 38a...
Upstream opening, 38b...downstream opening, 40...control valve, 40a...first valve, 40b...second valve.

Claims

[Scope of Claim for Utility Model Registration] An upstream opening and a downstream opening in the middle of the fuel passage connecting the first fuel pressure regulator that generates fuel pressure according to the intake manifold pressure and the second fuel pressure regulator that generates a constant fuel pressure. By controlling opening and closing according to the engine speed, intake manifold pressure and fuel pressure according to the engine speed are generated between the two openings, and a fuel flow rate corresponding to the fuel pressure is discharged from the fuel injection valve. In the fuel injection device, a first valve that can open and close the upstream opening and a second valve that can open and close the downstream opening are integrally provided, and when one of the two openings is open, the other valve is closed. A pressure control mechanism characterized by being equipped with a solenoid valve that controls the valve to close.