Method and apparatus for monitoring catalyst efficiency and...

Details Method and apparatus for monitoring catalyst efficiency and... Method and apparatus for monitoring catalyst efficiency and...

2005-03-22

2005-03-22

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

C060S274000, C060S276000, C123S688000, C123S690000, C073S118040, C073S023310

Reexamination Certificate

active

06868666

ABSTRACT:
A vehicle exhaust system includes a catalytic converter and an outlet sensor. The outlet sensor generates a sensor signal based on an oxygen level of exhaust gases exiting the catalytic converter. A controller communicates with an engine and the outlet sensor, and monitors the sensor signal during a predetermined period of engine operation. The controller commands an intrusive catalyst monitor test in a default order if the outlet sensor signal transitions through both thresholds during a predetermined period. The controller performs an intrusive outlet sensor test during cruise operation of the engine if the signal fails to transition through both thresholds during the catalyst monitor test.

REFERENCES:
patent: 5877413 (1999-03-01), Hamburg et al.
patent: 5921078 (1999-07-01), Takaku et al.
patent: 6453663 (2002-09-01), Orzel et al.
patent: 6698187 (2004-03-01), Nishioka et al.

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