Patent ID: 7578123

Claim:
An exhaust cleaning device of a diesel engine in which a filter for catching and collecting a particulate matter within exhaust gas is arranged in an exhaust passage, and regeneration processing of the filter is performed in regeneration timing set in advance, the exhaust cleaning device comprising: an operating state detecting member for detecting an operating state of the diesel engine; an integrating member for presuming a generating amount of the particulate matter within the exhaust gas on the basis of the operating state detected by the operating state detecting member, and integrating the generating amount of the particulate matter on the basis of the is presumed generating amount of the particulate matter; a first judging member for comparing the integrating amount integrated by the integrating member and a first threshold value set in advance, and judging a regenerating period of the filter; a filter state detecting member for detecting a state of the filter; a second judging member for comparing a detecting value showing the state of the filter detected by the filter state detecting member and a second threshold value, and judging the regenerating period of the filter; a first correcting member for correcting the first threshold value on a reducing side when it is not judged as the filter regenerating period by the first judging member and it is judged as the filter regenerating period by the second judging member; a second correcting member for correcting the first threshold value on an increasing side when it is not judged as the filter regenerating period by the second judging member and it is judged as the filter regenerating period by the first judging member; and a regeneration processing member for performing regeneration processing of the filter when it is judged as the filter regenerating period in at least one of the first judging member and the second judging member.