EXHAUST PURIFICATION APPARATUS FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust purification apparatus for an internal combustion engine that can more efficiently eliminate sulfur poisoning of a catalyst.

SOLUTION: When a catalyst floor temperature doesn't reach a temperature T2 that is the lowest temperature in a releasable temperature area where a sulfur poisoning a catalyst noble metal is oxidized under a lean air-fuel (S202:YES), the exhaust purification apparatus increases the temperature of the catalyst floor temperature by heating a chemical heat storage material (S204-S206) and executes an air-fuel ratio lean control by fuel cutting (S207) so that the catalyst floor temperature is made to be equal to or exceed the temperature T2.

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