Patent ID: 7854113
Filing Date: 2010-12-21
Classification: F01N

Abstract:
1. A catalyst temperature estimation device, comprising: a catalytic converter carrying a catalyst disposed in an exhaust passage of an engine for converting exhaust gases to less harmful substances; an adsorbed unburnt-fuel-component quantity calculation element for calculating the amount of an unburnt fuel component adsorbed on the catalyst in a fuel cut period of the engine based on a number of all adsorption sites, which is determined depending on an activated state of the catalytic converter capable of adsorbing the unburnt fuel component; an exhaust O an oxidation reaction heat calculation element for calculating reaction heat produced when the adsorbed unburnt fuel component in the amount calculated by the adsorbed unburnt-fuel-component quantity calculation element reacts with O a catalyst temperature estimation element for estimating the temperature of the catalyst in the fuel cut period, on the basis of the reaction heat calculated by the oxidation reaction heat calculation element.