Catalyst temperature estimation device
First Claim
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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,an exhaust O2 quantity calculation element for calculating the amount of O2 in the exhaust gases in the fuel cut period,an oxidation reaction heat calculation element for calculating reaction heat produced when the absorbed unburnt fuel component in the amount calculated by the adsorbed unburnt-fuel-component quantity calculation element reacts with O2 in the exhaust gases in the amount calculated by the exhaust O2 quantity calculation element, anda 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.
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Abstract
In a fuel cut period, an adsorbed CO quantity calculation section calculates the amount CATco of CO adsorbed on a catalyst, and an exhaust O2 quantity calculation section calculates the amount GASo2 of O2 in exhaust gases. CO oxidation reaction heat ΔHr produced when the calculated amount CATco of absorbed CO reacts with the calculated amount GASo2 of O2 in the exhaust gases is calculated by a ΔHr calculation section, and used in estimation of the temperature of the catalyst.
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8 Claims
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1. A catalyst temperature estimation device, comprising:
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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, an exhaust O2 quantity calculation element for calculating the amount of O2 in the exhaust gases in the fuel cut period, an oxidation reaction heat calculation element for calculating reaction heat produced when the absorbed unburnt fuel component in the amount calculated by the adsorbed unburnt-fuel-component quantity calculation element reacts with O2 in the exhaust gases in the amount calculated by the exhaust O2 quantity calculation element, and 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification