Ffv의 에탄올 농도 학습방법

Learning method of etanol concentraion for ffv

Abstract

본 발명은 에탄올센서가 구비되지 않은 FFV에서 산소센서의 고장이 발생한 경우에도, 에탄올 농도의 학습이 가능하도록 하여 엔진의 부조화 및 시동 꺼짐을 억제하고 엔진의 운전성을 안정되게 유지할 수 있도록 하여 차량의 신뢰성을 향상시키고 나아가 차량의 상품성을 향상시킬 수 있도록 한다.
PURPOSE: A method for learning the ethanol concentration of FFV(Flexible Fuel Vehicle) is provided to monitor that the vibration of engine gets smaller than a vibration reference value while changing the recent learnt concentration of ethanol if the vibration of engine is larger than the vibration reference value. CONSTITUTION: A method for learning the ethanol concentration of FFV comprises the following steps of: determining(S20) if an oxygen sensor malfunctions; determining(S30) if the vibration of engine is larger than vibration reference value in a case where the oxygen sensor malfunctions; and monitoring(S50) if the vibration of the engine gets smaller than the vibration reference value while changing the recent learnt concentration of ethanol if the vibration of engine is larger than the vibration reference value as the result of the vibration determining step. [Reference numerals] (AA) Start; (BB) Ethanol concentration decreases; (CC,EE,S30) Engine vibration(Roughness) > Reference vibration value ?; (DD) Ethanol concentration increases; (FF) Maintain the ethanol learning value; (GG) End; (S10) Refuel?; (S20) Oxygen sensor failure?; (S51) Current ethanol learning value > Reference concentration value ?; (S60) End ethanol concentration learning

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