Device for regulating a fuel injection pump for an internal combustion engine as a function of the depression prevailing in the induction pipe

Claim 1

DEVICE FOR REGULATING A FUEL INJECTION PUMP FOR AN INTERNAL COMBUSTION ENGINE, SAID DEVICE COMPRISING A WALL DEFINING THE INDUCTION PIPE OF THE ENGING, A FIRST CHAMBER, A FLEXIBLE DIAPHRAGM PARTLY DEFINING THE CHAMBER AND OPERATIVELY CONNECTED TO AN ELEMENT OF THE INJECTION PUMP CONTROLLING THE FLOW OF FUEL FROM THE LATTER SO THAT MOVEMENT OF THE DIAPHRAGM VARIES THE FUEL FLOW, THE SAID WALL DEFINING INDUCTION PIPE INCLUDING A WALL PORTION DEFINING A VENTURI HAVING A NECK PORTION, AN AIR ENTRY REGULATING THROTTLE LOCATED IN THE NECK PORTION, A FIRST APERTURE IN THAT PART OF SAID WALL PORTION DEFINING SAID NECK PORTION OF THE VENTURI, A SECOND APERTURE IN SAID WALL IN A POSITION DOWNSTREAM OF THE VENTURI RELATIVE TO THE FLUID FLOW THROUGH THE INDUCTION PIPE, AND MEAN PUTTING THE CHAMBER IN COMMUNICATING WITH SIMULTANEOUSLY THE FIRST APERTURE AND THE SECOND APERTURE, THE POSITION OF THE FIRST APERTURE BEING SUCH THAT THE FIRST APERTURE IS WHOOLY ON THE DOWNSTREAM SIDE OF THE THROTTLE IN THE IDLE SPEED POSITION OF THE THROTTLE WHEAREAS A PART OF THE FIRST APERTURE IS ON THE UPSTREAM SIDE OF THE THROTTLE WHEN THE THROTTLE OCCUPIES A POSITION CORRESPONDING TO THE BEGINNING OF AN ACCELERATION OF THE ENGINE AND WHOLLY EXPOSED OF THE SUCTION PREVAILING IN SAID NECK PORTION IN THE FULLY OPEN POSITION OF THE THROTTLE.