SYSTEMS AND METHODS FOR IMPROVING CATALYST DIAGNOSTICS IN THE PRESENCE OF SENSOR DEGRADATION

摘要

Systems and methods for diagnosing operation of a catalyst are presented. In one example, threshold limits for catalyst variables are adjusted in response to attributes of a catalyst monitor sensor that may vary with sensor age. The catalyst variables may provide insight into whether or not the catalyst is degraded or operating as intended.

主权项

1. A method for diagnosing a catalyst, comprising:
adjusting a catalyst degradation threshold in response to a slope of a catalyst monitor sensor output; indicating catalyst degradation in response to a variable not exceeding the catalyst degradation threshold; and adjusting a state of an actuator in response to the indication of degradation.