Exhaust gas recirculation system abnormality diagnosis device

Details Exhaust gas recirculation system abnormality diagnosis device Exhaust gas recirculation system abnormality diagnosis device

2007-07-31

2007-07-31

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

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S568120, C123S568160, C701S114000

Reexamination Certificate

active

11365660

ABSTRACT:
An exhaust gas recirculation passage connects an exhaust passage with an intake passage. A cooling device is mounted to the exhaust gas recirculation passage for cooling exhaust gas in the exhaust gas recirculation passage. An EGR valve adjusts a flow passage area of the exhaust gas recirculation passage. An exhaust gas quantity (EGR quantity) in the exhaust gas recirculation passage is feedback-controlled by manipulating an opening degree of the EGR valve based on a measurement value of an airflow meter. Existence or nonexistence of an abnormality in the cooling device is diagnosed based on whether a measurement value of the opening degree of the EGR valve contains a component corresponding to compensation for reduction of the EGR quantity due to degradation of cooling performance of the cooling device.

REFERENCES:
patent: 6848434 (2005-02-01), Li et al.
patent: 6866610 (2005-03-01), Ito
patent: 2002/0074105 (2002-06-01), Hayashi et al.
patent: 2006/0042608 (2006-03-01), Buck et al.
patent: 2001193577 (2001-07-01), None
patent: 1 347 166 (2003-09-01), None

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