Exhaust cleaning device of internal combustion engine

An exhaust cleaning device of an internal combustion engine comprising:

• a particulate filter disposed in an exhaust duct of the internal combustion engine;
• temperature increase means for increasing the temperature of the particulate filter;
• operational state detection means for detecting an operational state of the internal combustion engine;
• temperature detection means for detecting the temperature of the particulate filter;
• particulates accumulation amount estimate means for estimating a particulates accumulation amount on the particulate filter;
• regeneration control means for operating the temperature increase means to increase the temperature of the particulate filter to approximately a predetermined target temperature, so that accumulated particulates are burned and removed when the output of the particulates accumulation amount estimate means exceeds a predetermined value;
• and
• correction means for correcting an operational amount of the temperature increase means by the regeneration control means, the correction means comprising:
• feedback correction means for correcting the operational amount of the temperature increase means with feedback, so that the output of the temperature detection means becomes approximately the predetermined target temperature;
• model setting means for expressing a time lag in the variation of temperature with respect to the variation of the operational amount of the temperature increase means by a transfer function;
• temperature estimate means for estimating a temperature on which the time lag is reflected on the basis of the output of the operational state detection means, the operational amount of the temperature increase means, and the transfer function set by the model setting means;
• and
• learning correction means for correcting the operational amount of the temperature increase means on the basis of the deviation between the output of the temperature estimate means and the output of the temperature detection means, so that a temperature estimated value coincides with a detection value, and for storing a correction amount as a learning correction amount.