CPC F02D 41/22 (2013.01) [F01N 9/005 (2013.01); F01N 11/002 (2013.01); F02D 41/0235 (2013.01); F02D 41/0255 (2013.01); F02D 41/1446 (2013.01); F02D 41/221 (2013.01); F01N 2550/00 (2013.01); F01N 2900/00 (2013.01); F02D 2200/0804 (2013.01)] | 17 Claims |
1. A controller for an internal combustion engine, the controller being employed for the internal combustion engine mounted on a vehicle, the controller comprising processing circuitry, the processing circuitry being configured to execute an integrated value calculating process and an anomaly diagnosing process, wherein
the integrated value calculating process
repeatedly obtains
an upstream gas temperature that indicates a temperature of exhaust gas upstream of an exhaust purification device in an exhaust passage, and
a downstream gas temperature that indicates a temperature of exhaust gas downstream of the exhaust purification device, and
calculates
an upstream integrated value that is an integrated value of a difference obtained by subtracting the upstream gas temperature at a starting point in time of integration from the upstream gas temperature after starting of the internal combustion engine, and
a downstream integrated value that is an integrated value of a difference obtained by subtracting the downstream gas temperature at the starting point in time of the integration from the downstream gas temperature after the starting of the internal combustion engine, and
the anomaly diagnosing process obtains an anomaly determination result indicating that the exhaust purification device is in a removed state when a deviation between the upstream integrated value and the downstream integrated value, taken over a range ending when the downstream gas temperature becomes higher than or equal to a determination threshold, after a time since the starting of the internal combustion engine is smaller than a reference level, the determination threshold being higher than a dew point.
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