JPS6371470U

JPS6371470U -

Info

Publication number: JPS6371470U
Application number: JP16540486U
Authority: JP
Priority date: 1986-10-28
Filing date: 1986-10-28
Publication date: 1988-05-13
Also published as: JPH0452468Y2

Description

[Brief explanation of the drawing]

第１図は本考案の実施例に係るデイーゼル機関
の電子制御ユニツトインジエクタの断面図、第２
図は第１図のＡ部拡大図、第３図は同デイーゼル
機関の電子制御ユニツトインジエクタの制御手段
の説明図、第４図は制御信号の波形図、第５図は
同制御信号の全作動時間の決定ＭＡＰ１、第６図
は同制御信号の初期閉弁時間の決定ＭＡＰ２、第
７図は制御信号の波形を決めるフローチヤート図
、第８図は同デイーゼル機関のユニツトインジエ
クタの作用説明図、第９図は従来に於けるデイー
ゼル機関の電子制御ユニツトインジエクタの断面
図、第１０図は同デイーゼル機関の電子制御ユニ
ツトインジエクタの作用説明図、第１１図は同デ
イーゼル機関の電子制御ユニツトインジエクタの
低速域での噴射圧の説明図、第１２図は同デイー
ゼル機関の電子制御ユニツトインジエクタの高速
域での噴射圧の説明図である。１……ユニツトインジエクタ本体、１Ａ……シ
リンダ部、２……スピル弁装置、３……スピル弁
、４……制御手段、５……燃料給油通路、６……
燃料戻り通路、７……コントロールユニツト、８
……ソレノイド、９……エンジン負荷センサ、１
０……エンジン回転センサ、１１……プランジヤ
、１１Ａ……Ｌ字状の孔、１４……連通路、１５
……合流点、１６……合流通路、ｔ_１……全作動
時間、ｔ_２……初期閉弁時間。 Figure 1 is a sectional view of an electronic control unit injector for a diesel engine according to an embodiment of the present invention;
The figure is an enlarged view of part A in Figure 1, Figure 3 is an explanatory diagram of the control means of the electronic control unit injector of the diesel engine, Figure 4 is a waveform diagram of the control signal, and Figure 5 is a complete diagram of the control signal. MAP 1 for determining the operating time; FIG. 6 is a MAP 2 for determining the initial valve closing time of the control signal; FIG. 7 is a flowchart for determining the waveform of the control signal; FIG. 8 is an explanation of the operation of the unit injector of the diesel engine. Figure 9 is a sectional view of a conventional electronic control unit injector of a diesel engine, Figure 10 is an explanatory diagram of the operation of the electronic control unit injector of the diesel engine, and Figure 11 is an electronic control of the diesel engine. FIG. 12 is an explanatory diagram of the injection pressure of the unit injector in a low speed range, and FIG. 12 is an explanatory diagram of the injection pressure of the electronically controlled unit injector of the same diesel engine in a high speed range. DESCRIPTION OF SYMBOLS 1... Unit injector main body, 1A... Cylinder part, 2... Spill valve device, 3... Spill valve, 4... Control means, 5... Fuel supply passage, 6...
Fuel return passage, 7... Control unit, 8
... Solenoid, 9 ... Engine load sensor, 1
0...Engine rotation sensor, 11...Plunger, 11A...L-shaped hole, 14...Communication path, 15
...merging point, 16...merging passage, _t1 ...total operating time, _t2 ...initial valve closing time.

Claims

[Scope of utility model registration request]

A fuel supply passage and a fuel return passage are formed in the unit injector body, and a spill valve device is provided in the unit injector body for controlling the return of fuel from the fuel return passage by a spill valve whose opening and closing are controlled by a control means. A plunger that reciprocates by following the movement of the cam is inserted into the unit injector body, and fuel is sent to the tip of the unit injector body through the fuel supply passage, and with the spill valve closed, the plunger adds fuel. In the electronically controlled unit injector of a diesel engine, the spill valve device is used to fully open the spill valve after injecting pressurized fuel for a predetermined time. 1. An electronic control unit injector for a diesel engine, characterized in that the electronic control unit injector for a diesel engine is equipped with a control means for opening a spill valve by a minute displacement after an initial valve closing time has elapsed, and then fully opening it.