POMPE D'INJECTION DE CARBURANT

A.POMPE D'INJECTION DE CARBURANT.B.POMPE CARACTERISEE EN CE QUE L'ORGANE D'ETRANGLEMENT 22 EST SUSCEPTIBLE D'ETRE REGLE PAR LA PRESSION DANS UNE CHAMBRE DE COMMANDE 25, LAQUELLE EST SUSCEPTIBLE D'ETRE RACCORDEE A UNE SOURCE DE PRESSION 20, 43 PAR L'INTERMEDIAIRE D'UNE INSTALLATION DE COMMANDE DE LA PRESSION 44, 45 QUI EST ELLE-MEME SUSCEPTIBLE D'ETRE COMMANDEE EN FONCTION DE LA VITESSE DE ROTATION PAR UN APPAREIL ELECTRONIQUE DE COMMANDE 19.C.L'INVENTION S'APPLIQUE NOTAMMENT AUX MOTEURS DIESEL. A fuel injection pump is proposed, based on a fuel injection pump of a known type, which has an adjusting member for determining the injection duration and is provided with a throttle device for determining the effective supply stroke of the pump piston. In accordance with the invention it is proposed that the position of the throttle device be varied by means of a pressure control device, which is controllable by signals of an rpm-dependent electronic control unit. The position of the adjusting member determining the duration of injection remains as constant as possible, while the throttle device adjusts the flowthrough cross section of a connecting line leading from the pump work chamber to a fuel withdrawal chamber in accordance with rpm. Thus it is possible, in particular given the small injection quantities required during idling, to effect a uniformly small injection quantity per unit of time during a relatively long injection duration; this results in a substantial reduction in noise.