Method for monitoring the catalytic activity of a catalytic converter in the exhaust gas system of an internal combustion engine
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United States of America Patent
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Jul 4, 1995
Issued Date -
N/A
app pub date -
May 23, 1994
filing date -
Aug 28, 1990
priority date (Note) -
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Abstract
A method for monitoring catalytic activity of a catalytic converter through which exhaust gas can flow in an exhaust system of an internal combustion engine includes measuring a temperature at least at two temperature measuring sensors and periodically repeatedly determining a temperature measuring variable from signals issued by the sensors during operation of the engine with an engine monitoring system. Further measuring variables characterizing an applicable operating state of the engine are determined, a temperature limit value is determined from the further measuring variables, catalytic activity is determined by comparing the temperature measuring variable with the temperature limit value, and a report is issued if the temperature measuring variable is lower than the temperature limit value.
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