Fuel injection apparatus

Claim 1

In a fuel injection apparatus for the continuous injection of fuel into the suction tube of an internal combustion engine, said suction tube containing an arbitrarily operable butterfly valve, said apparatus being of the known type that has (a) an air sensor disposed in said suction tube spaced from said butterfly valve, said air sensor being deflected by the flow of intake air as a function of the intake air quantities, (b) chamber means containing liquid, (c) means for pressurizing said liquid, (d) means for transmitting the force of said pressurized liquid to said air sensor, said force constituting a return force affecting said air sensor and opposing the deflecting force of the air flow, said return force being independent from the deflected position of said air sensor, (e) a fuel metering and distributor valve having a movable valve member operatively connected to said air sensor to be displaced thereby to an extent proportionate to the deflection of said air sensor for maintaining constant the fuel-to-air ratio for any given return force, (f) a pressure control valve varying, as a function of its position, the pressure of said liquid in said chamber means for altering said return force, the improvement comprising A. an electromagnet incorporated in said pressure control valve, said electromagnet including a solenoid, B. circuit means for applying to said solenoid a current having an intensity characterizing at least one engine parameter and C. means responsive to the electromagnetic force of said solenoid for varying the position of said pressure control valve.