EXHAUST EMISSION CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of enhancing the durability and also a forced regeneration of good efficiency by executing the forced regeneration while an ash depositing form different from the depositing form of particulates is taken into consideration.

SOLUTION: The exhaust emission control device is equipped with a corrective value setting means 56 to set the corrective value for correction of the regenerating timing so that the thickness of particulates deposited on a particulate filter 2 at start of a forced regeneration becomes approximately constant in compliance with the effective capturing surface area of the particulate filter 2 decreasing with the deposit of the ash contained in the exhaust gas on the particulate filter 2 and a regeneration timing correcting means 58 to correct the regenerating timing on the basis of the corrective value upon setting the time as the regenerating timing when the predetermined conditions are met. A regeneration control means 52 performs forced regeneration of the particulate filter 2 at the corrected regeneration timing.

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