Patent ID: 9611772
Date: 2017-04-04
CPC Classifications: F01N,Y02T

Claim:
1. An abnormality detection system of an internal combustion engine comprising: an exhaust purification catalyst arranged in an engine exhaust passage; a hydrocarbon feed valve arranged in the engine exhaust passage upstream of the exhaust purification catalyst, wherein the exhaust purification catalyst comprises: an air-fuel ratio sensor arranged downstream of a peripheral portion of a downstream side end face of the exhaust purification catalyst in an exhaust gas flow region corresponding to the downstream side of the particulate deposition region when viewed along a longitudinal axis of the exhaust purification catalyst, wherein when an air-fuel ratio of an exhaust gas flowing into the exhaust purification catalyst is made to instantaneously change, if deposition of particulate in the exhaust gas causes clogging at the particulate deposition region in the peripheral portion of the upstream side end face of the exhaust purification catalyst, a speed of change of an output value of the air-fuel ratio sensor falls compared with when deposition of the particulate does not cause clogging; and an electronic control unit configured to determine whether deposition of particulate in the exhaust gas causes dogging at the particulate deposition region in the peripheral portion of the upstream side end face of the exhaust purification catalyst when the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst is made to instantaneously change,