| 摘要 |
A system and method for compensating for variation in a signal generated by an exhaust gas sensor include determining local maxima and minima of the signal, determining an average difference between local maxima and adjacent local minima, determining an average of the local maxima and an average of the local minima, and modifying at least one parameter based on the average difference, the local maxima average, and/or the local minima average to compensate for variation of the signal generated by the exhaust gas sensor. The modified parameter may include a switching value used to count switches of the sensor signal for monitoring catalytic converter performance or a closed loop fuel control gain value. A sensor switch may be counted for each time period having a difference between an adjacent or consecutive maximum and minimum which exceeds the switching value. Switch ratios are maintained based on both a nominal switching value and the adaptive switching value. One switch ratio is selected for comparison to a failure threshold to indicate degraded catalyst performance.
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