JPH02141675U

JPH02141675U -

Info

Publication number: JPH02141675U
Application number: JP5115389U
Authority: JP
Priority date: 1989-04-28
Filing date: 1989-04-28
Publication date: 1990-11-29

Description

[Brief explanation of the drawing]

第１図は本考案の実施例を示すユニツトインジ
エクタの構成図、第２図は同上の作用を説明する
ためのフローチヤート、第３図はエンジンの負荷
に応じて最適なセツト荷重を求めるマツプの一例
を示す線図、第４図はリターンスプリングのセツ
ト荷重を変化させたときの管内圧の変化を示す線
図、第５図は熱発生パターンを示す線図である。３……プランジヤ、４……圧力室、６……噴射
ノズル、７……燃料供給路、８……コントロール
バルブ、１０……制御手段、８１……バルブ体、
８５……ソレノイド、８６……セツトスクリユー
、８７……リターンスプリング、８８……作動手
段。 Fig. 1 is a configuration diagram of a unit injector showing an embodiment of the present invention, Fig. 2 is a flowchart for explaining the above action, and Fig. 3 is a map for determining the optimum set load according to the engine load. FIG. 4 is a diagram showing the change in pipe internal pressure when the set load of the return spring is changed, and FIG. 5 is a diagram showing the heat generation pattern. 3... Plunger, 4... Pressure chamber, 6... Injection nozzle, 7... Fuel supply path, 8... Control valve, 10... Control means, 81... Valve body,
85... Solenoid, 86... Set screw, 87... Return spring, 88... Operating means.

Claims

[Scope of Claim for Utility Model Registration] A pressure chamber pressurized by a plunger, an injection nozzle communicating with this pressure chamber, a fuel supply path that supplies fuel to the pressure chamber, and a fuel supply path provided in the middle of this fuel supply path. In the unit injector, the unit injector is equipped with a control valve that selectively opens and closes the fuel supply path to control the pressure in the pressure chamber, and a control means that outputs an opening/closing signal for the control valve, the control valve comprising: a valve body that opens and closes the fuel supply passage; a return spring that biases the valve body in a direction in which the valve body opens the fuel supply passage; and a return spring that causes the valve body to move in a direction in which it closes the fuel supply passage. A solenoid, a set screw that is in contact with one end of the return spring and is provided so as to be able to be screwed forward and backward in the direction of operation of the spring, and an operating means that rotates the set screw to change the set pressure of the return spring. A unit injector comprising: a control means for outputting a set pressure control signal for controlling the operation of the actuation means according to the load of the engine.