Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1998-04-28
2000-09-05
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123506, 123467, F02M 3304
Patent
active
061127213
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a fuel injection system that can be used in a diesel engine.
BACKGROUND ART
Heretofore, as one of fuel injection systems for a diesel engine, a common rail fuel injection system (i.e., accumulator-type fuel injection system) has been developed. In the common rail fuel injection system, high-pressure fuel pressurized by a fuel pump is accumulated in a common rail (i.e., accumulator), and an electromagnetic valve disposed in a fuel injection nozzle is so controlled as to open and close a needle valve disposed in the fuel injection nozzle, which makes it possible to achieve the control in fuel injection.
For example, Japanese Patent Laid-Open No. Hei 6-93936 discloses an accumulator-type fuel injection system, which is shown in FIG. 12. Now, with reference to FIG. 12, an example of the common rail fuel injection system will be described. In the common rail fuel injection system, there are provided: a high-pressure common rail (hereinafter referred to as the high-pressure accumulator or high-pressure fuel accumulator) 103 for storing high-pressure fuel therein; and, a low-pressure common rail (hereinafter referred to as the low-pressure accumulator or low-pressure fuel accumulator) 104 for storing low-pressure fuel therein.
Supplied to the high-pressure accumulator 103 of these accumulators is the fuel having been pressurized to a predetermined value by a high-pressure fuel pump 101, while supplied to the low-pressure accumulator 104 is the fuel having been pressurized by the high-pressure pump 101 and having passed through a pressure-regulating valve (i.e., regulator) 118 to decrease in pressure.
Further, provided in a downstream side of the low-pressure accumulator 104 is a three-way electromagnetic valve (i.e., second three-way electromagnetic valve ) 107. Connected with this second three-way electromagnetic valve 107 are: a fuel passage 110b from the above-mentioned low-pressure accumulator 104; a fuel passage 110a from the high-pressure accumulator 103; and, a communication passage 110d communicating with a fuel chamber 112 of a fuel injection nozzle (i.e., injector) 109.
This second three-way electromagnetic valve 107 is so constructed as to be subjected to a switching control for selectively supplying the high-pressure fuel from the high-pressure accumulator 103 and the low-pressure fuel from the low-pressure accumulator 104 to the fuel chamber 112 of the injector 109. Incidentally, in this case, when the second three-way electromagnetic valve 107 is held closed (i.e., held in its OFF position), the fuel passages 110b and 110d are communicated with each other to permit the low-pressure fuel to be supplied from the low-pressure accumulator 104 to the fuel chamber 112. On the other hand, when the second three-way electromagnetic valve 107 is held open (i.e., held in its ON position), the fuel passages 110a and 110d are communicated with each other to permit the high-pressure fuel to be supplied to the fuel chamber 112, which stops the supply of the low-pressure fuel.
Further, as shown in FIG. 12, in this injector 109, there is provided a three-way electromagnetic valve (i.e., first three-way electromagnetic valve) 105 for controlling the fuel injection. As shown in the drawing, connected with this first three-way electromagnetic valve 105 are: a fuel passage 110a from the high-pressure accumulator 103; a fuel return passage 110c; and, a fuel passage 110e communicating with a control chamber 111 of the injector 109.
And, the first three-way electromagnetic valve 105 is so constructed as to be subjected to a switching control for: supplying the high-pressure fuel from the high-pressure accumulator 103 to the control chamber 111 of the injector 109; and, discharging the high-pressure fuel, which has been supplied to this control chamber 111, into a fuel tank 117.
In this case, this first three-way electromagnetic valve 105 is adapted to: connect the fuel passage 110a from the high-pressure accumulator 103 with the control chamber 111 when a control signal
REFERENCES:
patent: 4440134 (1984-04-01), Nakao et al.
patent: 5517972 (1996-05-01), Stockner
patent: 5642714 (1997-07-01), Buckley
patent: 5732679 (1998-03-01), Takahasi et al.
Kouketsu Susumu
Tanabe Keiki
Yokomura Hitoshi
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Moulis Thomas N.
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