EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device for safely and efficiently regenerating a DPF by quickly increasing a DPF temperature during regenerating the DPF and keeping it near a target temperature to prevent the breakage of the DPF due to a high temperature or the deterioration of an oxidation catalyst while suppressing the worsening of fuel consumption.

SOLUTION: The exhaust emission control device comprises a DOC 4 arranged on the upstream side of the DPF 3 installed in an exhaust passage 2 of a diesel engine for burning and removing PM accumulated on the DPF 3 with the operation of a temperature rise means such as post injection by an ECU 6. The ECU 6 has a first correcting means for correcting a temperature rise control input in accordance with a result of comparing a DPF temperature estimated on the basis of (A) information for exhaust gas flowing into the DPF 3, (B) engine operated conditions and (C) the control input of the temperature rise means with a target temperature and a second correcting means for correcting a temperature rise control input in accordance with a result of comparing a DPF temperature estimated on the basis of (D) information for exhaust gas exhausted from the DPF 3 with the target temperature. It controls regeneration with high responsiveness and accuracy.

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