Control apparatus for alcohol engine

Claim 1

A control apparatus for an alcohol engine of a vehicle having a fuel tank containing a fuel mixture of an alcohol and gasoline, the apparatus comprising: pump means for supplying the fuel from said fuel tank to said engine; alcohol concentration sensing means for outputting a detection signal corresponding to an alcohol concentration of the fuel mixture; alcohol concentration calculating means responsive to said detection signal for calculating said alcohol concentration; computing means responsive to said alcohol concentration for computing an optimum condition to operate said pump means; and driving means responsive to said optimum condition for driving said pump means; said pump means includes at least a first fuel pump and a second fuel pump, said driving means includes a first driver for driving said first fuel pump and a second driver for driving said second fuel pump, and said computing means includes judging means for judging a first pump driving condition to drive said first fuel pump through said first driver when the alcohol concentration is smaller than a reference concentration and for judging a second pump driving condition to drive both of the first and second fuel pumps through said first and second driver, respectively, when the alcohol concentration is larger than a reference concentration.