Patent ID: 7146805

Claim:
A regeneration device for a diesel particulate filter which traps particulate matter contained in an exhaust gas of a diesel engine, comprising: a sensor which detects a temperature of the filter; a mechanism which raises the temperature of the exhaust gas in order to burn the particulate matter trapped in the filter; and a programmable controller programmed to: cumulatively calculate a time during which the temperature of the filter exceeds a target temperature as a first value; determine, when the filter temperature does not exceed the target temperature, whether or not the filter temperature exceeds a temperature allowing combustion of the particulate matter, which is lower than the target temperature; calculate a value obtained by multiplying the time during which the filter temperature exceeds the temperature allowing combustion of the particulate matter by a predetermined coefficient, as a second value; calculate a sum of the first value and the second value as an effective regeneration time; and control the mechanism to stop raising the exhaust gas temperature, on the basis of the effective regeneration time.