Patent ID: 8327626
Filing Date: 2012-12-11
Classification: B01D,F01N,F02D,Y02T

Abstract:
1. An exhaust emission control device for an exhaust system including a catalyst regeneration type particulate filter incorporated in an exhaust pipe and having a frontward oxidation catalyst, and a fuel addition device to add fuel into the exhaust gas upstream of said oxidation catalyst, captured particles being burned by heat of oxidation reaction which the fuel added by the fuel addition device undergoes on the oxidation catalyst to thereby attain forced regeneration of the particulate filter, said exhaust emission control device comprising: a controller including a deposition amount estimating unit that estimates a particle deposition amount in the particulate filter, said controller automatically conducts fuel addition by the fuel addition device depending upon the deposition amount under a condition of the particulate deposition amount being estimated by said deposition amount estimating unit to be within an automatic regeneration range and an operation device voluntarily adds fuel by a driver's manual operation under a condition of an engine being in an idling state, and said controller controls fuel addition to be automatically conducted by said fuel addition device when a predetermined time has passed during the engine being in the idling state and with no manual operation of said operation device under a condition of the particulate deposition amount being estimated by the deposition amount estimating unit to be within a manual regeneration range over said automatic regeneration range.