Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Patent
1997-12-23
1999-09-21
Wolfe, Willis R.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
123357, F02D 4140
Patent
active
059547820
DESCRIPTION:
BRIEF SUMMARY
This application claims the benefit under 35 U.S.C. .sctn.371 of prior PCT International Application No. PCT/JP96/01768 which has an International filing date of Jun. 26, 1996 which designated the United States of America, the entire contents of which are hereby incorporated by references.
TECHNICAL FIELD
This invention relates to an engine fuel injection timing control apparatus which is suitably used for controlling a fuel injection pump of a diesel engine and, in particular, to an engine fuel injection timing control apparatus which can control a fuel injection timing by adjusting the position of a timer piston via a solenoid valve.
BACKGROUND ART
Known as a fuel injection pump for a diesel engine is the one having a configuration shown in FIG. 4. The fuel injection pump shown in FIG. 4 is a so-called distributor type fuel injection pump based on an electronic control system. In FIG. 4, 10 refers to a pump main body, and a vane type feed pump 11 is disposed within the pump main body 10. Here, as for the feed pump 11, together with its original side view, a front view with an angle of representation changed by 90.degree. is also shown.
The feed pump 11 is rotated by a drive shaft 12 which is actuated as the engine rotates, thereby forcibly feeding fuel from a fuel tank. The fuel emitted from the feed pump 11 is transmitted to a pump chamber 13 within the pump main body 10, and then is supplied therefrom to a fuel forced feed plunger 15 through a passage 14. Inserted into the passage 14 is a fuel cutting magnet valve 16.
The plunger 15 supplies, by way of a communicating hole 17A formed therein, fuel from the passage 14 to a delivery valve 19 through a passage 18, while moving back and forth within a plunger chamber 17 formed in the pump main body 10. Such back and forth movement of the plunger 15 is effected by a cam disc 20 connected to one end of the plunger 15.
Namely, the plunger 15 and the cam disc 20 are rotated by the drive shaft 12 in response to the engine rotation. Also, the cam disc20 is urged by a spring 21 via the plunger 15, thereby abutting to a roller 23 axially supported by a roller holder 22. Here, the roller holder 22 does not move in the axial direction of the drive shaft 12 and usually (except for the time when rotational phase is being adjusted, which will be explained later) does not rotate around the axis of the drive shaft 12. Consequently, the cam disc 20 moves in the axial direction while being shoved by the roller 23 according to its cam profile. Thus, the plunger 15 moves back and forth, thereby supplying fuel at a desired timing.
Here, each cylinder is provided with the passage 18 and the delivery valve 19. For example, in the case of a four-cylinder engine, four pieces each of passages 18 and delivery valves 19 are provided.
As shown in FIGS. 5, the roller holder 22 is provided with a plurality of rollers 23 (which are four here), and the cam disc 20 has a cam profile corresponding thereto. Consequently, as the cam disc 20 makes one revolution, the plunger 15 is driven four times, whereby, for example, fuel is successively supplied to four cylinders respectively in response to these four driving operations of the plunger 15.
Here, provided for fuel injection amount control are a control sleeve 24, which moves back and forth on the outer periphery of the plunger 15 so as to adjust the forced feed stroke of the plunger 15, and a governor (electric governor here) 25 for controlling the control sleeve 24.
Further, in FIG. 4, 26 is a regulator valve, 27 is a sensing gear plate for detecting the rotational speed of the drive shaft 12, 28 is a fuel temperature sensor, and 29 is an overflow valve, provided with a check valve, for returning excess fuel within the pump chamber 13 to the fuel tank.
In order to control the fuel injection timing, such a fuel injection pump is provided with a timer 30. The timer 30 is equipped with a timer piston 31 for changing the position of the roller 23 in its rotating direction. Here, for convenience, the timer piston 31 is also depicted by a
REFERENCES:
patent: 4476832 (1984-10-01), Fujimori et al.
patent: 4638782 (1987-01-01), Yashahura et al.
patent: 4825369 (1989-04-01), Oshizawa
patent: 5188084 (1993-02-01), Sekiguchi
patent: 5261378 (1993-11-01), Fenchel et al.
patent: 5531204 (1996-07-01), Sekiguchi et al.
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Vo Hieu T.
Wolfe Willis R.
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