CONTROL DEVICE FOR FLEX FUEL ENGINE

摘要

<P>PROBLEM TO BE SOLVED: To provide a control device for a flex fuel engine inhibiting a sub feedback correction quantity set through sub feedback control from becoming of a value deviating from actual circumstances of individual differences and deterioration states of an actual air-fuel ratio sensor caused by use of fuel containing alcohol. Ž<P>SOLUTION: An electronic control device 100 controls fuel injection quantity by executing main feedback control for increasing and decreasing fuel injection quantity so that feedback control value calculated by correcting output value of the air-fuel ratio sensor 55 is made coincide with a target value, and the sub feedback control for increasing and decreasing the sub feedback correction quantity based on output value of an oxygen sensor 56 so that slippage of the main feedback control gets small. The electronic control device 100 increases and corrects feedback control value by adding concentration characteristic correction quantity in a process for calculating the feedback control value when it is estimated that the fuel contains alcohol. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž