<p>System for controlling the carburetion of an internal combustion engine comprising the following activities: a) starting the engine; b) determining the factor ?? using any known method; c)measuring the ionization current cio; d) modifying - from outside - the factor ? by a predefined amount equivalent to ?? bringing it to the value ?1=??+ ??; e) repeating the measurement of the ionization current ci1; f) calculating the value of the difference of the ionization current A?ci1 equivalent to cio - Ci1; g) repeating operations d. and e. until the difference between the last value of the ionization current ?,? and the second last value cin-1 is smaller than ?ci; where ?ci is a predefined value which is assumed to have no influence with respect to the carburetion.</p>
