Patent ID: 9650981
Date: 2017-05-16
CPC Classifications: F01N,F02D,F02M,Y02T

Claim:
1. A system for a vehicle, the system comprising: an upstream oxygen monitoring module that monitors an upstream oxygen sensor and determines an upstream transition period based on a time at which the upstream oxygen sensor detects a rich-to-lean fueling transition, wherein the upstream oxygen sensor monitors an oxygen concentration of an exhaust stream prior to an engine catalyst; a delay determining module that determines a delay period associated with the upstream oxygen sensor's detection of the rich-to-lean fueling transition; an upstream correcting module that determines a corrected upstream transition period based on the upstream transition period and the delay period; a downstream oxygen monitoring module that monitors a downstream oxygen sensor and determines a downstream transition period based on the response of the downstream oxygen sensor to the rich-to-lean fueling transition, wherein the downstream oxygen sensor monitors the oxygen concentration of the exhaust stream following the engine catalyst; an oxygen storage capacity (OSC) determining module that determines an OSC period based on the corrected upstream transition period and the downstream transition period; and a catalyst fault detection module that selectively adjusts operating parameters of an engine of the vehicle based on the OSC period.