Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2007-04-17
2007-04-17
Kwon, John T. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S456000
Reexamination Certificate
active
11227090
ABSTRACT:
A pressure-reduction valve that returns fuel in a common rail to a low-pressure system is such one that a valve-opening pressure of the valve device is changed by an actuator into a target common rail pressure. Thus, when the actual common rail pressure in the common rail exceeds the target common rail pressure, the pressure-reduction valve opens at once. On the contrary, when the actual common rail pressure in the common rail decreases to reach the target common rail pressure, the pressure-reduction valve closes at once. Accordingly, the pressure-reduction valve limits an overshoot and an undershoot of the actual common rail pressure to a minimum without being influenced by a fuel temperature or by detection timings of the common rail pressure sensor.
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DENSO Corporation
Kwon John T.
Nixon & Vanderhye PC
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