Regeneration controller for exhaust purification apparatus of internal combustion engine

A regeneration controller for an exhaust purification apparatus that is arranged in an exhaust system of an internal combustion engine, wherein the regeneration controller burns particulate matter in the exhaust purification apparatus by intermittently adding fuel to the exhaust system or by intermittently increasing the amount of fuel added to the exhaust system, the regeneration controller comprising:

• an exhaust temperature detector for detecting exhaust temperature at a location downstream from the exhaust purification apparatus;
• a stop timing determination section for determining a timing for stopping the fuel addition to the exhaust system or the increase of fuel addition to the exhaust system based on the exhaust temperature detected by the exhaust temperature detector and an elapsed time of the fuel addition to the exhaust system or the increase of fuel addition to the exhaust system;
• and
• a start timing determination section for determining a timing for starting the fuel addition to the exhaust system or the increase of fuel addition to the exhaust system based on the exhaust temperature detected by the exhaust temperature detector and an elapsed time in which there is no fuel addition to the exhaust system or in which there is no increase of fuel addition to the exhaust system.