METHOD OF CONTROLLING EXHAUST EMISSION CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide technology suitably eliminating drop of HC oxidation capacity of rhodium Rh in an exhaust emission control device provided with a catalyst containing rhodium Rh and a particulate filter.

SOLUTION: In the exhaust emission control device provided with the occlusion reduction type NOx catalyst containing rhodium Rh and the particulate filter, drop of HC oxidation capacity of rhodium Rh is eliminated by prohibiting rich spike control while temperature of the occlusion reduction type NOx catalyst is a predetermined temperature or higher and putting the occlusion reduction type NOx catalyst in a reduction atmosphere in a process that temperature of the occlusion reduction type NOx catalyst drops after PM forced regeneration process of the particulate filter is performed.

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