Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2003-02-10
2003-12-30
Gimie, Mahmoud (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S456000
Reexamination Certificate
active
06668805
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an accumulator fuel injection apparatus, in which high-pressure fuel generated in a high-pressure fuel pump is stored in a common rail and, then, is injected into a cylinder of an engine through an injector.
TECHNICAL BACKGROUND
Conventionally, a known accumulator fuel injection apparatus is provided with a high-pressure fuel pump to generate high-pressure fuel and deliver the same to a common rail. The high-pressure fuel pump is comprised of an electromagnetic valve to open/close an intake passage for fuel. When the electromagnetic valve is opened in an upward movement of a plunger housed in the pump, low-pressure fuel sucked in a plunger chamber is pressurized to generate high-pressure fuel and, then the high-pressure fuel is delivered to the common rail.
However, in the above high-pressure fuel pump, when an IG switch is turned off, the electromagnetic valve is fully closed to stop the sucking of fuel into the pump (plunger chamber). Accordingly, the pump is empty (there is no fuel) when the engine is stopped. Therefore, in a subsequent startup of the engine, the fuel is sucked into the pump and then the fuel is delivered (i.e., no fuel is delivered at early stage of the startup of the engine). Consequently, a pressure of fuel, necessary to start the engine, cannot be obtained because the delivery of fuel to the common rail is delayed. This causes a problem in which the time for startup is increased.
DISCLOSURE OF THE INVENTION
The present invention is provided in view of the above circumstances, and the object thereof is to provide an accumulator fuel injection apparatus in which fuel is stored in a high-pressure fuel pump when the engine is stopped, so that a subsequent startup can be enhanced.
According to a first aspect of the present invention, there is provided an accumulator fuel injection apparatus, comprising a high-pressure fuel pump driven by an internal combustion engine; a common rail for storing high-pressure fuel delivered from the high-pressure fuel pump; an electromagnetic valve to open/close an intake passage through which the high-pressure fuel pump sucks fuel; and control means in which a fuel intake mode to cause the high-pressure pump to suck the fuel is set and carried out during the time between receipt of operation stopping instructions by the internal combustion engine and an actual stopping of the operation (Engine speed=0).
According to the present invention, fuel can be stored in the high-pressure fuel pump because a fuel intake mode is carried out during the time between receipt of operation stopping instructions by the engine and an actual stopping of the operation. Consequently, the fuel stored in the pump when the engine is stopped is delivered to the common rail in a subsequent startup of the engine. Therefore, the pressure of fuel necessary to startup the engine can be obtained in a short time, and the time for startup can be decreased.
The present invention can be further and sufficiently understood by reference to the accompanying drawings and the preferred embodiments in the following.
REFERENCES:
patent: 4884545 (1989-12-01), Mathis
patent: 6293757 (2001-09-01), Oda et al.
patent: 6311674 (2001-11-01), Igashira et al.
patent: 0902181 (1999-03-01), None
patent: 7-103097 (1995-04-01), None
patent: 9-166061 (1997-06-01), None
patent: 11-315730 (1999-11-01), None
Kato Akira
Sugiyama Tatsumasa
Denso Corporation
Gimie Mahmoud
Nixon & Vanderhye PC
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