Patent ID: 8078392
Filing Date: 2011-12-13
Classification: F01N,F02B,F02D,Y02T

Abstract:
1. 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.