Enhanced diagnosis of a multi-banked catalyst exhaust system

Details Enhanced diagnosis of a multi-banked catalyst exhaust system Enhanced diagnosis of a multi-banked catalyst exhaust system

2005-04-19

2005-04-19

Kwon, John T. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S691000, C060S274000

Reexamination Certificate

active

06882928

ABSTRACT:
Methods and apparatus are provided for diagnosing emissions in a multi-banked catalyst emissions system for a motor vehicle. A method of diagnosing emissions in a multi-banked emissions system suitably includes obtaining an emissions measurement for each bank in the multi-banked emissions system, converting the emissions measurements to scaled values, adding the scaled values to obtain a total emission value, and triggering an indication if the total emission value exceeds a pre-determined maximum. A system for processing emissions from an engine in a motor vehicle typically includes multiple exhaust banks and a processor. Each of the exhaust banks includes a catalytic converter and at least one oxygen sensor. The processor receives measurements from the oxygen sensors, converts the measurements to scaled values as a percentage of a threshold value, computes a total emission value from the scaled values, and triggers an indication if the total emission value exceeds the threshold value.

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