Catalytic converter efficiency monitor
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United States of America Patent
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Dec 8, 1998
Grant Date -
N/A
app pub date -
May 8, 1996
filing date -
May 8, 1996
priority date (Note) -
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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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