Automotive catalyst oxygen storage capacity diagnostic

Details Automotive catalyst oxygen storage capacity diagnostic Automotive catalyst oxygen storage capacity diagnostic

2005-04-05

2005-04-05

Nguyen, Tu M. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S274000, C060S276000, C060S285000, C123S19800E

Reexamination Certificate

active

06874313

ABSTRACT:
An engine exhaust system includes a catalytic converter. An inlet sensor senses a first oxygen level of exhaust gases entering the catalytic converter. An outlet sensor senses a second oxygen level of exhaust gases exiting the catalytic converter. A controller communicates with a fuel system of an engine, the inlet sensor, and the outlet sensor. The controller initiates a rich condition after a fuel cut-off period and calculates a mass of oxygen released by the catalytic converter based on a mass air flow into the engine. The controller calculates a target oxygen storage capacity (OSC) of the catalytic converter over a target time period.

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