Patent ID: 9617938
Date: 2017-04-11
CPC Classifications: F01N,F02D,F02M,Y02T

Claim:
1. An abnormality diagnosis apparatus of an exhaust gas purification apparatus, comprising: an exhaust gas purification apparatus which is arranged in an exhaust passage of an internal combustion engine and which includes a selective catalytic reduction catalyst; a supply apparatus which supplies an additive that is ammonia or an ammonia precursor to the exhaust gas purification apparatus; an EGR apparatus which recirculates a part of exhaust gas from the exhaust passage at a downstream side of a position of supplying the additive by the supply apparatus to an intake passage; and an electronic control unit comprising at least one processor configured to: calculate a NO diagnose an abnormality in the exhaust gas purification apparatus using the calculated NO when a part of the exhaust gas is recirculated by the EGR apparatus, increasingly correct the calculated NO