CPC G07C 5/10 (2013.01) [B62J 45/41 (2020.02); B62M 7/02 (2013.01); G01M 15/104 (2013.01); F01N 1/00 (2013.01); F01N 2550/00 (2013.01); F01N 2560/00 (2013.01); F01N 2900/0416 (2013.01)] | 6 Claims |
1. A processing unit configured to determine abnormality in an exhaust gas sensor configured to be disposed in an exhaust passage of an internal combustion engine and to detect a component in exhaust gas, the processing unit comprising:
a processor configured to:
calculate responsiveness of the exhaust gas sensor on the basis of a timewise change of output values of the exhaust gas sensor, and
determine that the exhaust gas sensor has abnormality when the responsiveness calculated is lower than a predetermined responsiveness threshold,
wherein the processor is configured to determine if the exhaust gas sensor has abnormality, excluding an excluded period during which a slope of the output values becomes zero or is inversed with respect to a preceding trend of the timewise change while the output values of the exhaust gas sensor timewisely change between a predetermined first determination value and a second determination value, and
wherein the processor is configured to detect the excluded period on the basis of a differential value of the timewise change of the detected values.
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