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A regeneration control method for regenerating a continuously regenerating diesel particulate filter device capable of regenerating a filter by efficiently removing PM while suppressing the deterioration of fuel consumption and preventing a drivability from being deteriorated, wherein the clogged-st

A regeneration control method for regenerating a continuously regenerating diesel particulate filter device capable of regenerating a filter by efficiently removing PM while suppressing the deterioration of fuel consumption and preventing a drivability from being deteriorated, wherein the clogged-state of the filter is judged in three or more phases of the clogged-state and, when the clogged-state of the filter reaches a specified phase, a specified regenerating mode operation set in correspondence with the reached phase is performed.

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1. A regeneration control method for regenerating a filter in a continuously regenerating-type diesel particulate filter device, for capturing particulate matters in exhaust gas from an engine and oxidizing and removing the captured particulate matters, comprising:determining a state of clogging of

1. A regeneration control method for regenerating a filter in a continuously regenerating-type diesel particulate filter device, for capturing particulate matters in exhaust gas from an engine and oxidizing and removing the captured particulate matters, comprising:determining a state of clogging of the filter at three classified stages of clogging of the filter; performing no regeneration-mode operation when the state of clogging of the filter is at a first state of clogging; when the state of clogging of the filter is at a second state of clogging, performing a first regeneration-mode operation only when an index temperature for regeneration control is not greater than or equal to a prescribed first judgment temperature; and when the state of clogging of the filter is at a third stage of clogging, performing a second regeneration-mode control accompanying a first exhaust-temperature heating up control without a post-injection when the index temperature for regeneration control is lower than a prescribed second judgment temperature, while performing a second regeneration-mode control accompanying a second exhaust-temperature heating-up control with a post-injection when the index temperature for regeneration control is greater than or equal to the prescribed second judgment temperature. 2. The regeneration control method of claim 1, wherein said continuously regenerating diesel particulate filter device is a continuously regenerating diesel particulate filter device having a catalyst carried by said filter.3. The regeneration control method of claim 1, wherein said continuously regenerating diesel particulate filter device is a continuously regenerating diesel particulate filter device provided with an oxidation catalyst on the upstream side of said filter.4. The regeneration control method of claim 1, wherein said continuously regenerating diesel particulate filter device is a continuously regenerating diesel particulate filter device having a catalyst carried by said filter and at the same time provided with an oxidation catalyst on the upstream side of said filter.