METHOD FOR DETERMINING THE ALCOHOL CONTENT OF A NEW FUEL MIXTURE IN AN INTERNAL COMBUSTION ENGINE OF A VEHICLE, AND DEVICE FOR IMPLEMENTING SAID METHOD

摘要

The invention relates to a method for determining the alcohol content of a fuel mixture in an internal combustion engine of a vehicle that can be successively supplied with two types of fuel of predefined composition, at least one of which contains a mixture of gasoline and alcohol, according to which, after the introduction of a volume of a new fuel into a tank of the vehicle previously containing a volume of an old fuel mixture, the first moment to be determined is determined. from which the new fuel mixture arrives from the tank to the first injector (i). After this first moment, from the first period of stabilized operation of the engine sufficiently long for this purpose, the direction of a possible variation of the combustion richness with respect to a previously measured richness is determined. We deduce the type of new fuel introduced, and, crossing this information with the volumes of old and new fuel in the tank respectively, the alcohol content of the new mixture.