| 摘要 |
PROBLEM TO BE SOLVED: To accurately monitor quantity of remaining fuel in a fuel tank without providing a fuel gage in relation to auxiliary fuel used for combustion assist mainly at cold start of a flex fuel engine. SOLUTION: The flex fuel engine 10 is constructed as an on-vehicle flex fuel engine mounted on a vehicle using alcohol (main fuel) and gasoline (auxiliary fuel). Only Fuel supply of the main fuel from a main fuel injector 19 is executed basically based on air fuel ratio control during engine operation after completion of warming up of the engine 10. Auxiliary fuel is forcibly supplied over a fixed period of time when the engine 10 is under idling operation condition. Absolute value of integrated value of difference of theoretical air fuel ratio and detection value of an air fuel ratio sensor 32 after execution of supply of the auxiliary fuel is calculated. Quantity of remaining fuel in the auxiliary fuel tank 21 is monitored based on the calculated absolute value. COPYRIGHT: (C)2008,JPO&INPIT
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