Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2007-03-23
2008-07-01
Solis, Erick (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S690000, C123S447000, C123S456000
Reexamination Certificate
active
07392793
ABSTRACT:
A fuel injection controller calculates a fuel pressure-feeding start angle of a fuel pump as a valve opening start angle of a metering valve, which regulates a discharge amount, by adding a base angle and a feedback correction value. The base angle is calculated in accordance with a command injection amount and target fuel pressure based on a basic map. The feedback correction value is calculated based on differential pressure between sensed fuel pressure and the target fuel pressure. If an abnormality is caused in either one of two metering valves, the base angle is calculated based on an abnormal period map instead of the basic map. Thus, controllability of the fuel pressure is maintained high even when the abnormality is caused in a part of multiple pressure-feeding systems including multiple plungers of the fuel pump.
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Denso Corporation
Nixon & Vanderhye PC
Solis Erick
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