DISPOSITIF ELECTRONIQUE DE COMMANDE, NOTAMMENT POUR SYSTEME A COMBUSTIBLE D'UN MOTEUR A COMBUSTION INTERNE

CE DISPOSITIF DE COMMANDE D'UN ACTIONNEUR 10 A ELECTRO-AIMANT COMPREND UN TRANSISTOR 14 DANS UN CIRCUIT SERIE AVEC UNE RESISTANCE 15 ET L'ENROULEMENT DE L'ELECTRO-AIMANT. UN CIRCUIT D'EXCITATION 19 FOURNIT DES IMPULSIONS DE COMMUTATION AU TRANSISTOR 14 A TRAVERS UNE PORTE ET 20. UN CIRCUIT DE COMMANDE 24 FOURNIT UN SIGNAL DE COMMANDE 22 AU CIRCUIT 19 AINSI QU'UN SIGNAL DE DECLENCHEMENT 23 A UN CIRCUIT MONOSTABLE 21 QUI FOURNIT UN SIGNAL D'AUTORISATION A LA PORTE ET. LE CIRCUIT 24 RECOIT UN SIGNAL DE REACTION 16 DE LA RESISTANCE 15. TANT QUE CE SIGNAL 16 RESTE DANS DES LIMITES PREDETERMINEES LES SIGNAUX 22 ET 23 SONT FOURNIS. SI LE SIGNAL 16 SORT DESDITES LIMITES, AU MOINS LE SIGNAL 23 DE DECLENCHEMENT EST ARRETE ET LE TRANSISTOR 14 N'EST PLUS COMMUTE APRES LA PERIODE DU CIRCUIT MONOSTABLE 21. An electronic control system for a solenoid based actuator for a fuel system of an engine includes a switchable transistor connected in a series circuit with a current sensing resistor and the solenoid of the actuator. A power circuit supplies switching pulses to the transistor through an AND gate. A control circuit supplies a control signal to the power circuit and also a trigger signal to a monostable circuit. The monostable circuit supplies an enable signal to the AND gate. The control circuit receives a feedback signal from the sensing resistor and as long as this lies within prescribed limits the control circuit will supply the control signal and the trigger signal. If the feedback signal lies outside the prescribed limits at least the trigger signal will be halted so that after the time period of the monostable circuit has lapsed the transistor will receive no further switching pulses. A fuse is connected in series with the solenoid which will blow in the event that the solenoid remains energized for longer than a prescribed time.