Regulator mechanism for fuel injection apparatus

Claim 1

A regulator mechanism for a fuel injection apparatus supplying fuel to an internal combustion engine having an air intake tube provided with an arbitrarily operable butterfly valve, said fuel injection apparatus being of the type that has (a) an air sensor disposed in said air intake tube in series with said butterfly valve and displaceable by the air flow in said intake tube to an extent proportionate to the throughgoing air quantities, (b) a fuel metering and distributor valve including a control plunger connected to said air sensor to be displaced thereby for the metering of fuel quantities in proportion to the air quantities passing through said intake tube, (c) means for applying a normally constant return force to said air sensor, said return force opposiing the force of air flow exerted on said air sensor, said return force being exerted by pressurized fuel, said means incuding a chamber containing said pressurized fuel, comprising A. a conduit communicating with said chamber for discharging pressurized fuel from said chamber, B. a flat seat valve controlling the flow passage section of said conduit, said flat seat valve having 1. a stationary flat valve seat, 2. a relatively small movable membrane cooperating with said valve seat to vary the flow passage section thereof for throttling to a greater or lesser extent the discharge of pressurized fuel from said chamber through said conduit, C. means for applying the fuel pressure in said conduit to one side of said relatively small membrane, D. a relatively large membrane spaced from said relatively small membrane, E. rigid means connecting the two membranes to one another for transmitting forces from one membrane to the other, F. means for applying the air pressure prevailing in said intake tube upstream of said sensor to one side of said relatively large membrane, G. means for applying the air pressure prevailing in said intake tube downstream of said sensor to the other side of said relatively large membrane and H. a spring urging said relatively small membrane into a closed position towards said valve seat.