Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Reexamination Certificate
2008-07-01
2008-07-01
Wolfe, Jr., Willis R (Department: 3747)
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
C123S568160, C123S568210
Reexamination Certificate
active
07392797
ABSTRACT:
An EGR failure determination system for an internal combustion engine, which is capable of accurately determining failures of both an external EGR device and an internal EGR device, irrespective of whether the EGR amount is large or small, thereby making it possible to enhance marketability of the system. The EGR failure determination system includes an ECU. The ECU calculates an actual fresh air ratio, and sets a target value thereof. Further, it calculates a feedback correction coefficient according to the actual fresh air ratio and the target value, and controls an exhaust recirculation mechanism and three variable mechanism. When the feedback correction coefficient is not within a predetermined range, and if it is larger than 0.5, at least one of the three variable mechanism is determined to be faulty, whereas if it is not larger than 0.5, the exhaust recirculation mechanism is determined to be faulty.
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Kitamura Toru
Ogawa Ken
Arent Fox LLP.
Honda Motor Co. Ltd.
Wolfe, Jr. Willis R
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