Control apparatus for an internal combustion engine

Details Control apparatus for an internal combustion engine Control apparatus for an internal combustion engine

2007-10-02

2007-10-02

Wolfe, Jr., Willis R. (Department: 3747)

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

C701S108000, C073S118040

Reexamination Certificate

active

11367273

ABSTRACT:
A control apparatus for an internal combustion engine can compensate for a variation of intake pressure resulting from various factors whereby a failure detection area can be expanded, and false detection can be prevented to enable failure determination for an EGR system with high reliability. The apparatus determines whether a vehicle is decelerating, forcedly opens and closes an EGR valve, and determines whether an EGR control device is in failure by comparing a pressure change index value based on intake pressures upon the forced opening and closing of the EGR valve with a failure determination value. The apparatus adjusts the intake pressure to a predetermined state before the EGR valve is forcedly opened and closed, whereby a failure determination can be always made based on the intake pressure whose variation was compensated for with the intake pressure becoming a predetermined characteristic to the number of revolutions per minute of the engine.

REFERENCES:
patent: 5368005 (1994-11-01), Kako
patent: 5488938 (1996-02-01), Ohuchi
patent: 5513616 (1996-05-01), Matsumoto et al.
patent: 5542400 (1996-08-01), Matsumoto et al.
patent: 7104259 (2006-09-01), Terada
patent: 08-028364 (1996-01-01), None
patent: 08-035449 (1996-02-01), None

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