| 摘要 |
PROBLEM TO BE SOLVED: To keep a proper engine brake force at speed reduction, and simultaneously to protect the quality of a catalyst 13 at a high temperature. SOLUTION: By the command of ECU 31, the supply of a fuel is stopped when a vehicle is in a speed reduction state, and the fuel is supplied intermittently, when it is detected by a temperature sensor 15 that the temperature of the catalyst 13 is higher than a prescribed one, thus ensuring the engine brake force at speed reduction, and simultaneously restraining the deterioration of the catalyst 13 by an oxidation atmosphere. Thereby, the retention of proper engine brake force at speed reduction and the protection of the catalyst 13 at a high temperature are effected in compatibly.
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