EXHAUST EMISSION CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of performing forced filter regeneration after preventing excessive rise in temperature of an HC adsorption catalyst in the forced filter regeneration.

SOLUTION: The exhaust emission control device includes: a filter 22 trapping a particulate in an exhaust system R of an internal combustion engine 1; an HC adsorption catalyst 19 provided in the exhaust system and adsorbing and desorbing hydrocarbon; trapping amount calculating means 122-3a calculating the trapping amount of the particulate to the filter; adsorbed amount calculating means 122-4a calculating the adsorbed amount of the hydrocarbon to the HC adsorption catalyst; HC adsorption catalyst regeneration control means 122-4 carrying out desorption processing of the HC adsorbed to the HC adsorption catalyst; and filter regeneration control means 122-3 carrying out forced regeneration of the filter when the trapping amount of the particulate exceeds a predeterminedd amount. The HC adsorption catalyst regeneration control means carries out the desorption processing of the HC adsorption catalyst 19 before the forced regeneration of the filter, when the adsorbed amount of the hydrocarbon Mmon(n) exceeds the predetermined amount in the forced filter regeneration.

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