VERFAHREN UND VORRICHTUNG ZUM STEUERN VON GLÜHSTIFTEN IN EINEM DIESELMOTOR, INSBESONDERE FÜR MOTORFAHRZEUGE

The method comprises the steps of : - driving in an on-off manner in a period of time an electronic switch (M) in series with a respective glow plug (GP) between the terminals of a d. c. voltage supply (B); - sensing the glow plug voltage (V) and the glow plug current (I); - generating analogue sense signals (AS1, As2) representative of the time integral of the glow plug voltage (V) and current (I); - generating analogue reference signals (R1, R2) corresponding to the digital values of corresponding control words (W1, W2); - comparing the sense signals (AS1, AS2) to the respective reference signals (R1, R2) and modifying the corresponding control words (W1, W2) so as to minimize the difference between the sense signals (AS1, AS2) and the reference signals (R1, R2); and - calculating the average values of the sensed voltage (V) and current (I) on the basis of the values of said control words (W1, W2) at the beginning and at the end of the "on" time of the electronic switch (M).