ZERO CERIA WASHCOAT CATALYST MONITOR

摘要

A catalyst degradation detection method for use with a zero ceria catalyst. The method uses techniques to measure transient responses to engine control events of upstream and downstream sensors to determine catalyst degradation and performance. By measuring transient behavior, the method can determine catalyst degradation and performance based on the limited oxygen storage of precious metal catalysts that do not include added ceria or other materials with high oxygen capture rates.

主权项

1. A method of determining catalyst degradation comprising:
detecting, by a processor, an engine control event; measuring a transient response of a first sensor upstream from the catalyst; measuring a transient response of a second sensor downstream from the catalyst; comparing the second sensor transient response to the first sensor transient response; and determining if the comparison of the second sensor transient response to the first sensor transient response exceeds a predefined threshold value.