External exhaust gas recirculation on board diagnostic using...

Details External exhaust gas recirculation on board diagnostic using... External exhaust gas recirculation on board diagnostic using...

2005-02-01

2005-02-01

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

Internal-combustion engines

Engine speed regulator

Idle speed control

C123S339230, C123S568160, C123S568270, C123S680000

Reexamination Certificate

active

06848418

ABSTRACT:
A system is described for determining degradation of an exhaust gas recirculation system of an internal combustion engine. This method utilizes a combination of parameters to accurately determine degradation of the exhaust gas recirculation system. For example, the system utilizes changes in intake manifold pressure, changes in idle speed control operation, changes in ignition timing, and fueling changes to accurately determine operation of the exhaust gas recirculation system.

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