Patent ID: 9523300
Filing Date: 2016-12-20
CPC Classification: B01D,F01N,F02D,Y02T

Claim Text:
1. An exhaust emission purifier of an internal combustion engine, comprising a catalyst that is provided in an exhaust system of the internal combustion engine to purify exhaust gas, and an electronic control unit, wherein the electronic control unit is configured to estimate an amount of accumulated poisoning material in the catalyst based on an operating state of the engine, and the electronic control unit is configured to execute a first regeneration procedure by raising a temperature of the catalyst up to a first predetermined temperature and lowering an exhaust air-fuel ratio on condition that an estimated value of the amount of accumulated poisoning material is equal to or greater than a predetermined determination value, the electronic control unit is configured to determine whether a degree of a deviation between the estimated value of the amount of accumulated poisoning material in the catalyst and an actual amount of accumulated poisoning material in the catalyst reaches a predetermined degree, and when the degree of the deviation reaches the predetermined degree, the electronic control unit is configured to execute a second regeneration procedure separately from the first regeneration procedure by raising the temperature of the catalyst up to a temperature higher than the first predetermined temperature and lowering the exhaust air-fuel ratio, so that the deviation is eliminated upon completion of the second regeneration procedure.