Fuel injection apparatus

Claim 1

In a fuel injection system for mixture-compressing, externally ignited internal combustion engines having an air induction tube into which continuous injection is maintained, the system including: an air flow rate member and an arbitrarily actuatable throttle valve mounted in the air induction tube in series in the direction of air flow; a fuel metering and distributing valve assembly including a control slide serving as a movable member of the fuel metering and distributing valve assembly; a fuel tank, a fuel supply line connected to the fuel tank and the fuel metering and distributing valve assembly through which fuel is delivered from the fuel tank to the fuel metering and distributing valve assembly; at least one pressure control valve connected to the fuel metering and distributing valve assembly for controlling the fluid pressure exerted against the control slide; a plurality of fuel injection nozzles; and an equal plurality of fuel injection lines connected to the fuel metering and distributing valve assembly downstream of the control slide and to a respective one of the fuel injection nozzles, said control slide being displaceable against the fluid pressure controlled by said at least one pressure control valve by the air flow rate member in accordance with the quantity of air flowing in the air induction tube, the displacement of the control slide resulting in a quantity of fuel being apportioned to the fuel injection valves by the fuel metering and distributing valve assembly which is proportional to the air quantity flowing in the air induction tube, the improvement comprising: a spring connected to the air flow rate member; a filling valve connected to the fuel tank, said filling valve including a movable valve member and means providing a return force; means defining a throttle point connected between the filling valve and the fuel tank; and a plurality of scavenging lines connected to a respective one of the fuel injection lines and to the filling valve, wherein: (i) the control slide is actuated when the engine is turned off by said spring in the direction of opening of the fuel metering and distributing valve assembly; (ii) the scavenging lines are controlled by the filling valve in such a manner that the movable valve member thereof opens each scavenging line toward the fuel tank via the throttle point when the engine is turned off; and (iii) the movable valve member of the filling valve is displaced, with a delay, against the return force in the closing direction of the filling valve by means of the pressure of the fuel being supplied when the engine is started, thereby interrupting the connection of the scavenging lines to the fuel tank.