Multiple-kind fuel engine fuel injection control device

Abstract

[PROBLEM] To provide a multiple-kind fuel engine fuel injection control device which includes a plurality of maps for determining a basic fuel injection time corresponding to a state of an engine and changes over the map corresponding to alcohol concentration. [Means for Resolution] A fuel injection control device used in a multiple-kind fuel engine 1 is configured to include: a memory region 26 which stores a plurality of fuel injection control maps 30 in which a state of an engine 1 and a basic fuel injection time Ti are made to correspond to each other in response to the concentration of alcohol contained in the fuel; an O2 sensor 15 which is arranged in an exhaust pipe 4 and detects the oxygen concentration in an exhaust gas; a basic fuel injection time determination part 22 which determines the basic fuel injection time Ti using the currently selected fuel injection control map 30 of the concentration of alcohol; a correction coefficient determination part 24 which determines an air-fuel ratio correction coefficient Ko2 for correcting the basic fuel injection time Ti such that an air-fuel ratio of the engine 1 becomes a target air-fuel ratio in response to a detection value of the o2 sensor 15; a fuel injection quantity determination part 25 which determines a fuel injection quantity based on the basic fuel injection time Ti and the air-fuel ratio correction coefficient KO2; and a map changeover part 21 which selects the fuel injection control map 30 of the concentration of alcohol close to the concentration of alcohol of the fuel based on the air-fuel ratio correction coefficient Ko2.

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