A catalyst overheat prevention apparatus has a temperature obtaining portion that estimates a convergence temperature of a catalyst provided in the exhaust system of an internal combustion engine and the present temperature of the catalyst. The catalyst overheat prevention apparatus also has a fuel increment calculation portion, a comparison portion, a correction portion, and a fuel increment setting portion, which are used to execute OT fuel increase control when the convergence temperature and present catalyst temperature obtained by the temperature obtaining portion are equal to or higher than an OT determination temperature. The catalyst overheat prevention apparatus also has a present temperature correction portion that corrects the present catalyst temperature to be equal to the OT determination temperature when the present catalyst temperature is equal to or higher than the OT determination temperature and the convergence temperature is equal to the OT determination temperature.

Claims

10 · 2 independent · depth 3

10 granted claims

›1.independentA catalyst overheat prevention apparatus comprising:nan electronic control unit;the electronic control unit configured to estimate a convergence tempe…+7

›2.↳ 1The catalyst overheat prevention apparatus according to claim 1, wherein the electronic control unit corrects the estimated catalyst temperature to be…d2

›3.↳ 1The catalyst overheat prevention apparatus according to claim 1, wherein the electronic control unit corrects the estimated catalyst temperature to be…d2

›4.↳ 1The catalyst overheat prevention apparatus according to claim 1, wherein the electronic control unit corrects the estimated catalyst temperature to be…d2

›5.↳ 1The catalyst overheat prevention apparatus according to claim 1, wherein the electronic control unit calculates a control amount for the control based…d2

›6.↳ 1The catalyst overheat prevention apparatus according to claim 1, wherein the electronic control unit estimates the catalyst temperature based on the c…d2

›7.↳ 1The catalyst overheat prevention apparatus according to claim 1, wherein:nthe control for preventing overheating of the catalyst is OT fuel increase c…d2+1

›9.independentA catalyst overheat prevention control method comprising:nestimating a convergence temperature on which a temperature of a catalyst provided in an exh…+1

Classifications

7 codes

IPC · International Patent Classification

Section F — Mechanical engineering; lighting; heating; weapons

F01N11/00

USPC · US Patent Classification

60/27760/28560/32060/29960/27460/298

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2.7 y

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Examiner

Thomas Denion

art unit 3748 · TC 3700

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20120014410 A1	19 Jan 2012

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