Measuring and testing – Simulating operating condition – Marine
Patent
1997-11-18
1999-08-31
Dombroske, George
Measuring and testing
Simulating operating condition
Marine
73 2331, 73 2332, 60277, 701103, 701109, G01M 1900, G01L 326
Patent
active
059455977
ABSTRACT:
A method for monitoring the efficiency of a catalytic converter in a motor vehicle includes the steps of determining if at least one predetermined condition is met for monitoring the efficiency of the catalytic converter. The method includes biasing a fuel feedback multiplier of an internal combustion engine of the motor vehicle to run rich or lean if the at least one predetermined condition is met. The method includes counting a number of switches across a predetermined switch point from an upstream oxygen sensor and a downstream oxygen sensor. The method includes calculating a switching frequency ratio based on the count of the switches from the upstream oxygen sensor and downstream oxygen sensor and using the switching frequency ratio to establish the efficiency level of the catalytic converter.
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Co-pending and commonly assigned patent application serial No. 08/646,660, filed May 8, 1996.
Co-pending and commonly assigned patent application serial No. 08/497,592, filed Jun. 30, 1995.
SAE Technical Paper Series, Detection of Catalyst Performance Loss Using On-Board Diagnostics, William B. Clemmens, Michael A. Sabourin and Thomas Rao, Mar. 7, 1990, #900062.
Poublon Mark J.
Weglarz Michael W.
Calcaterra Mark P.
Chrysler Corpoation
Dombroske George
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