Patent ID: 9459242
Filing Date: 2016-10-04
CPC Classification: B01D,F01N,F02D,G01M,G01N,Y02A,Y02T

Claim Text:
1. A catalyst deterioration judging method for judging deterioration of an absorption reduction type NO x catalyst which is provided at an exhaust gas passage of an internal combustion engine, the absorption reduction type NO x catalyst being configured to absorb NO x and to reduce the absorbed NO x based on contact with a reducing agent, the exhaust gas passage including at least one injection valve, the catalyst deterioration judging method comprising: supplying, by an electronic control unit, the reducing agent to the absorption reduction type NO regulating, by the electronic control unit, an amount of the reducing agent supplied through the injection valve so that the air-fuel ratio of the exhaust gas is a lean air-fuel ratio such that: (A) NH measuring, by a NO judging, by the electronic control unit, the deterioration of the absorption reduction type NO