Patent ID: 8925300
Filing Date: 2015-01-06
Classification: F01N,Y02T

Abstract:
1. A method of determining catalyst degradation of a catalyst, the method 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; calculating a reaction time of the first sensor to the engine control based on the measured transient response of the first sensor; calculating a reaction time of the second sensor to the engine control event based on the measured transient response of the second sensor; comparing the reaction time of the second sensor to the reaction time of the first sensor; determining if the comparison of the reaction time of the second sensor to the reaction time of the first sensor is less than a predefined threshold value; and taking corrective action if it is determined that the comparison of the reaction time of the second sensor to the reaction time of the first sensor is less than the predefined threshold value. to the first sensor transient response exceeds a predefined threshold value.