| 摘要 |
In a fuel cut period, an adsorbed CO quantity calculation section calculates the amount CATco of CO adsorbed on a catalyst, and an exhaust O<SUB>2 </SUB>quantity calculation section calculates the amount GASo<SUB>2 </SUB>of O<SUB>2 </SUB>in exhaust gases. CO oxidation reaction heat DeltaH<SUB>r </SUB>produced when the calculated amount CATco of absorbed CO reacts with the calculated amount GASo<SUB>2 </SUB>of O<SUB>2 </SUB>in the exhaust gases is calculated by a DeltaH<SUB>r </SUB>calculation section, and used in estimation of the temperature of the catalyst.
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