Method of evaluating deteriorated state of catalytic converter for purifying exhaust gas
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United States of America Patent
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Aug 6, 2002
Grant Date -
N/A
app pub date -
Nov 9, 2000
filing date -
Nov 12, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The characteristics of an output of an exhaust gas sensor with respect to an air-fuel ratio of an engine are expressed according to a quadratic function, and the parameters of the quadratic function are sequentially identified according to a sequential identifying algorithm using data of the output of the exhaust gas sensor and data of an output of an air-fuel sensor which detects the air-fuel ratio of the engine. Deterioration evaluating parameters whose values change as the deterioration of a catalytic converter processes are sequentially determined from the identified values of the parameters of the quadratic function, and the deteriorated state of the catalytic converter is evaluated based on the determined deterioration evaluating parameters.
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