Measuring and testing – Simulating operating condition – Marine
Patent
1996-05-08
1998-12-08
Dombroske, George M.
Measuring and testing
Simulating operating condition
Marine
73 2331, 60277, 340438, 364431062, G01M 1500
Patent
active
058472711
ABSTRACT:
A method of monitoring 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 and combining a square wave multiplier signal with a feedback multiplier signal if the at least one predetermined condition is met. The method includes counting a number of square wave edges of the combined signal for an upstream oxygen sensor positioned upstream of the catalytic converter and counting a number of switches of a signal across a predetermined switch point from a downstream oxygen sensor positioned downstream of the catalytic converter. The method also includes the steps of calculating a switching frequency ratio based on the count of square wave edges and oxygen sensor switches and using the switching frequency ratio to establish the efficiency level of the catalytic converter.
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Poublon Mark J.
Weglarz Michael W.
Calcaterra Mark P.
Chrysler Corporation
Dombroske George M.
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