| 摘要 |
PROBLEM TO BE SOLVED: To provide an engine capable of sufficiently heating a sensor element to prevent a crack of the sensor element by performing feedback control after a temperature of an air-fuel ratio sensor is increased to a target temperature by using a heater included in the air-fuel ratio sensor itself at a start of the engine. SOLUTION: The engine 2 feedback-controls output rotation according to a detection value of the air-fuel ratio sensor 5. In the engine 2, a cooling water temperature detection means 29 is connected to a control means 6. At the start, the warming energization of the heater 4 included in the air-fuel ration sensor 5 is performed for a predetermined time. When the cooling water temperature is lower than the target temperature even after the heating energization, the heating energization of the heater 4 of the air-fuel ration sensor 5 is performed to make the cooling water temperature reach the target temperature. When the cooling water temperature reaches the target temperature, the heater 4 of the air-fuel ration sensor 5 is controlled so as to be applied with rated energization. COPYRIGHT: (C)2009,JPO&INPIT
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