Unburned fuel amount-estimating device in engine and temperature-estimating device of exhaust emission purifier

An unburned fuel amount component-estimating device in an engine, estimating an unburned fuel amount emitted from an engine after fuel combustion based upon a basic engine exhaust gas temperature as a control target value in an engine control system for controlling an engine operating condition based upon the basic engine exhaust gas temperature, comprising:

• a predetermined map comprising a required torque value and engine rotation speed for defining a basic engine exhaust gas temperature and basic engine unburned fuel amount;
• a detector which detects exhaust gas temperature indicating a magnitude of energy generated by the fuel combustion in the engine;
• a unit which determines an operating condition difference among the basic engine exhaust gas temperature and actual engine exhaust gas temperature;
• a unit which obtains an engine unburned fuel amount correction value based upon the differential exhaust gas temperature and said predetermined map;
• a compensating unit configured to compensates for said operating condition difference amount for an unburned fuel amount due to the deviation of said basic engine unburned fuel amount;
• an estimating unit configured to estimate the unburned fuel amount of said engine based on said engine unburned fuel amount correction value and basic engine unburned fuel amount.