Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Reexamination Certificate
2006-09-12
2006-09-12
Wolfe, Jr., Willis R. (Department: 3747)
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
C073S118040
Reexamination Certificate
active
07104259
ABSTRACT:
A failure diagnostic device for an exhaust gas recirculation (EGR) apparatus, which can detect an intake pipe pressure at a high accuracy with a simple control and can prevent false diagnosis of an EGR system. If at least either one of first and second off-mode intake pipe pressures P1off, P2offexceeds a cancel determination value K, an ECU determines that the intake pipe pressures P1off, Ponand P2offare not properly detected, and cancels the failure diagnosis of the EGR system. Therefore, the false diagnosis of the EGR system can be avoided with a simplified process without requiring specific determinations on individual abnormal states of the various components other than the EGR system. By setting the cancel determination value K based on the intake pipe pressure P resulting when EGR off-control is executed in a state of an EGR valve being stuck in a fully-open position, each improperly-detected intake pipe pressure can be excluded with reliability.
REFERENCES:
patent: 5349936 (1994-09-01), Uchinami
patent: 5368005 (1994-11-01), Kako
patent: 5513616 (1996-05-01), Matsumoto et al.
patent: 5540091 (1996-07-01), Nakagawa
patent: 5635633 (1997-06-01), Kadota
patent: 5675080 (1997-10-01), Wada
patent: 6856890 (2005-02-01), Muto et al.
patent: 2005/0199216 (2005-09-01), Matsumoto
patent: 08-082253 (1996-03-01), None
Fuji Jukogyo Kabushiki Kaisha
Smith , Gambrell & Russell, LLP
Wolfe, Jr. Willis R.
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