Electronic control device for a multi-fuel internal combustion engine

An electronic control device for an internal combustion engine which can use a mixed fuel prepared by mixing oxygenated compound with a petroleum refined fuel, said electronic control device comprising:

• operating condition detecting means for detecting operating conditions of said internal combustion engine;
• fundamental control data determining means for determining fundamental control data of said internal combustion engine from said operating conditions thus detected;
• refractive index detecting means for detecting a refractive index of said mixed fuel;
• oxygenated compound content calculating means for calculating an oxygenated compound content of said mixed fuel from said refractive index;
• means for determining first correction data from said oxygenated compound content thus calculated;
• first correcting means for correcting said fundamental control data by using said first correction data;
• air-fuel ratio detecting means for detecting an actual air-fuel ratio of said internal combustion engine;
• comparing means for comparing said actual air-fuel ratio and a target air-fuel ratio to obtain a difference value;
• second correcting means for correcting said calculated oxygenated compound content according to said difference value;
• distillation characteristic estimating means for estimating a representative quantity of a distillation characteristic of said petroleum refined fuel of said mixed fuel from said oxygenated compound content thus corrected and said refractive index;
• means for determining second correction data from said distillation characteristic thus estimated;
• and
• means for utilizing said second correction data to correct said fundamental control data corrected with said first correction data.