Exhaust Gas Purification Device

Abstract

An exhaust emission control device is realized which causes no battery exhaustion nor deterioration in engine startability even when the forced regeneration using the electric heater is conducted in the engine stopping status. Disclosed is an exhaust emission control device in which adopted as a filter body 7 for capturing particulates is a heat-regenerative particulate filter 10 with electric heater, the captured particulates being burned by heating of the electric heater 9 to forcedly regenerate the particulate filter 10 . A control unit 37 responsible for a series of control operations with respect to the forced regeneration of the particulate filter 10 is constructed such that the forced regeneration in an engine stopping status is conduced only when the voltage of the battery 34 is higher than a stipulated value, and is temporarily interrupted when engine starting operation is conducted during the forced regeneration in the engine stopping status.

1 . An exhaust emission control device wherein employed is a heat-regenerative particulate filter comprising a filter body for capturing particulates and an electric heater, the captured particulates being burned by heating through the electric heater for forced regeneration of the particulate filter, comprising a control unit responsible for a series of control operations for forced regeneration of the particulate filter being constructed such that the forced regeneration in an engine stopping status is conducted only when voltage of a battery is higher than a stipulated value, and is temporarily interrupted when the engine starting operation is conducted in the engine stopping status.