Abstract: An air introduction system of a fuel injection type engine, including a main passage and a fuel injector for injecting fuel into the main passage. Assist air is introduced to the surrounding of a top nozzle portion of the fuel injector so that the assist air acts on the fuel injected from the injector. A subpassage is connected to the main passage so as to supply the assist air. A main valve is disposed in the main passage and a subvalve is disposed in the subpassage. The main and subpassages are formed in a single throttle body.

Abstract: A fuel supply system for an internal combustion engine includes a fuel pump which draws fuel from a supply tank. A subsidiary fuel tank receives fuel from the supply by way of a conduit which incorporates a one way valve. The inlet of the pump is connected to a pipe which extends to adjacent the lower wall of the subsidiary tank. The subsidiary tank can be pressurized with air to force fuel towards the pump and a safety valve is fitted to the subsidiary tank to limit the pressure build up therein.

Abstract: A method and a fuel supply system for supplying fuel to a mixture-compressing internal combustion engine with externally supplied ignition. The fuel supply system includes a nozzle having a flow cross section of a nozzle-like body which discharges into the intake tube. Compressed air furnished by a compressed air source enters through this flow cross section in the intake tube at a pressure such that at the narrowest point or throat area of the nozzle the air attains sonic speed. A fuel delivery line also discharges at the narrowest point or throat area of the nozzle, and fuel metered in accordance with engine operating characteristics is carried via this fuel delivery line downstream of a fuel metering valve. The quantity of air flowing through the nozzle should be a partial flow of the aspirated air quantity; for instance, it should not be greater than the idling air quantity of the engine, so that at little expense, a continuous flow of air through the nozzle can be effected at sonic speed.

Abstract: A device for atomizing the fuel for an internal-combustion engine comprising a fuel pump, an electromagnetic fuel-injection valve connected to said fuel pump, an air-injection port adjoining the injection port of said electromagnetic fuel-injection valve, an electromagnetic air flow-controlling valve connected to said air-injection port, and an air pump for feeding air to said air flow-controlling valve, wherein said air flow-controlling valve is controlled in such a manner that the injection of air from said air-injection port takes place simultaneously with the injection of fuel from said fuel-injection valve, whereby the air pump and the driving circuit thereof are of a comparatively small size and the amount of power necessary for driving the air pump is of comparatively small.

Abstract: A method and apparatus for delivering metered quantities of liquid wherein the liquid is circulated through a chamber to fill the chamber with liquid and circulation is temporarily terminated with the chamber filled with liquid. While circulation is terminated gas under pressure is admitted to the chamber to displace liquid therefrom through a discharge port. The quantity of liquid displaced is controlled by regulating the volume of the chamber and/or by regulating the relative disposition in the chamber of the point of entry of the gas and point of discharge of the liquid.

Abstract: In an air assist device of a fuel injection type internal combustion engine, having an air assisted injector provided close to a nozzle thereof with an adapter constituting an assist air introducing portion, in which assist air introduced into the assist air introducing portion through assist air intake ports formed in the peripheral wall of the adapter is blown out of an assist air jet formed at the bottom of the adapter together with fuel so as to facilitate the atomization of fuel, the diameter of each opening of the assist air intake ports is made smaller than the diameter of an opening of the assist air jet, the assist air intake ports are provided in a plural number, so that the total opening area of the assist air intake ports can be made larger than the opening area of the assist air jet, and/or the assist air intake ports are penetrated in directions tangential to the inner wall surface of the adapter.

Abstract: A multicylinder internal combustion engine, especially a self-igniting internal combustion engine, with supply ducts leading to the cylinders which supply ducts emanate from a common fuel supply chamber with the ducts being supplied with a fuel-gas mixture. The fuel-gas mixture is present in a mist form in the supply chamber with the fuel, with a substantially identical droplet size, exhibiting a droplet diameter at which a flow characteristic is obtained for the droplets in the ducts leading to the cylinders which is respectively at least approximately identical to the flow characteristic of the gas. The fuel is fed to the common supply chamber continuously by way of an injection device with the premixed fuel-gas mixture, which is at a pressure elevated with respect to the pressure level in the supply chamber, exiting from the injection device at a speed of sound with atomization of its proportion of fuel, on account of a pressure jump at a cross section of the discharge orifice of the injection device.

Abstract: A fuel injection device for continuously injecting the mixture of fuel and air into the cylinders of an internal combustion engine has an intake pipe, an arbitrarily adjustable throttle flap, and a venturi in the intake pipe at a point upstream of the throttle flap. An air channel branches off from the narrowest point of the venturi and a main fuel metering arrangement supplies fuel to the mixing chamber portion of the channel substantially as a function of the air pressure at the venturi. A suction line is connected to receive the air and fuel from the mixing chamber in the channel and an idling fuel metering arrangement supplies fuel under constant pressure to the line during idling. A fuel delivery pump is connected to receive the air and fuel mixture in the line and to supply the mixture to the points of injection associated with the several cylinders of the engine.

Abstract: A nozzle is disclosed for the air injection of fuel into the combustion chamber of a diesel engine cylinder. The nozzle includes a piston reciprocably mounted in the nozzle body to define therein a premixing chamber to be placed in and out of communication with the combustion chamber via spray holes at the tip of the nozzle body. Slidably fitted at one end in an axial bore in the piston, a needle valve is sprung to normally close the spray holes with its other end. Toward the end of the compression stroke of the piston, the mixture of fuel and air trapped in the premixing chamber acts on the needle valve to cause same to open the spray holes against the bias of the spring and thus is injected into the combustion chamber. The spring serves to cause the needle valve to firmly close the spray holes immediately upon full injection of the fuel-air mixture.

Abstract: A fuel injection apparatus for externally ignited internal combustion gas engines is proposed. The fuel injection apparatus comprises an intake pipe in which an air flow meter and a throttle valve are provided. The fuel quantity injected into the intake pipe via an injection valve is controlled by the air flow meter. To prepare the combustible mixture of injected fuel and air, a preparation air line branches off from the intake pipe between the air flow meter and the throttle valve. This preparation air line discharges into the injection valve. A throttle is provided in the preparation air line. A full-load air line discharges into the preparation air line between the throttle and injection valve. A shut-off valve is provided in the full-load air line, said shut-off valve being completely open at least during the full-load operation of the combustion engine, allowing additional air flow into the preparation air line, which air is drawn from the intake pipe upstream of the air flow meter.

Abstract: An electromagnetically controlled fuel injection system which includes a mechanism for sensing a plurality of operating conditions of a combustion engine and for generating a plurality of electric signals corresponding to the conditions, an electrical control unit receiving the first electric signals to thereby generate a second electric signal in response thereto, an electromagnetically controlled fuel injection valve mechanism controlled by the second signal from the electrical control unit and having a fuel injection port formed therein and an electromechanically controlled air supply valve mechanism provided with an air supply port around the fuel injection port of the fuel injection valve and controlled by the second signal from the electric control unit.

Abstract: For the injection of premixed fuel and air into a diesel engine cylinder, a nozzle assembly has a piston reciprocably mounted in a nozzle body to define a premixing chamber therein. Fuel and air are delivered into this premixing chamber through respective ports which are simultaneously covered and uncovered by the piston. Extending through the premixing chamber, a stepped plunger has one end slidably fitted in a bore in the piston to define a pressure chamber therein for exerting a decreasing air pressure on the plunger and has the other end arranged for movement out of and back into the nozzle body for spraying the fuel-air mixture from the premixing chamber through spray holes formed therein. During the stroke of the piston to compress the fuel-air mixture trapped in the premixing chamber, the compressed mixture acts on the step of the plunger to hold same retracted in the nozzle body against the decreasing air pressure in the pressure chamber.

Abstract: Method of and apparatus for preparation of a combustible mixture of different mixing ration for a main combustion chamber and for a subsidiary combustion chamber for an internal combustion engine. In such apparatus there are a main suction channel terminating into the main combustion chamber and a subsidiary suction channel terminating into the subsidiary combustion chamber, both combustion chambers being separated from their suction channels by suction valves. The fuel is injected via an injection nozzle into the suction tract of the engine and the formed combustible mixture is sucked into the main combustion space of the engine. Simultaneously a part of the fuel is taken away from the injected fuel jet by a stream of sucked-in air, forming a combustible mixture which is sucked into the subsidiary combustion chamber of the combustion engine.

Abstract: Apparatus for continuously injecting fuel into the intake pipe of an internal combustion engine. The apparatus has an air channel branching off from the intake pipe at a point ahead of an adjustable throttle flap; a fuel metering device supplying fuel to the air channel in dependence upon engine load; and a fuel delivery pump arranged to receive a fuel-air mixture from the air channel through a narrowed constriction. The fuel delivery pump is constructed to convey fuel mixed with air even under conditions of maximum engine load. The fuel metering device has fuel exit openings which are directed toward the narrow constriction of the air channel forming the fuel delivery pump inlet.

Abstract: An engine is equipped with a fuel injector in an intake passageway immediately upstream of an intake valve. Air introduced from the intake passageway upstream of a throttle valve is ejected toward a clearance between the valve head of the intake valve and a valve seat, when the intake valve is opened. The ejected air stream strikes against the sprayed fuel injected from the fuel injector to improve the atomization of injected fuel and to form homogeneous air-fuel mixture to be inducted into the combustion chamber of the engine.

Abstract: A fuel supplying device for use in fuel injection type internal combustion engine. The device has a fuel metering device operatively connected to an air valve device disposed in the air horn upstream of a throttle valve, fuel supplying means adapted to supply the fuel at a constant supplying pressure to the fuel metering device, a constant differential pressure valve arranged to maintain a predetermined differential pressure across the fuel metering device, and an injector for discharging the metered fuel into the air horn in the vicinity of the throttle valve. The constant differential pressure valve includes a diaphragm type valve arranged to sense and amplify differential pressure across the fuel metering device, and a variable orifice type flow control device arranged to charge flow resistance of the metered fuel.

Abstract: A carburettor for air and liquid fuel under pressure for internal combustion engines has an air/fuel mixing chamber for mixing a controlled flow of air with gasoline and optionally methanol also. The fuel is disintegrated in the mixing chamber into fine droplets by impinging on a solid surface and/or on a stream of air. The mixture is passed into a vaporizer connected to the intake manifold of the engine. A rotary sleeve valve allows or prevents additional air to be added to the mixture in the vaporizer to optimize the air/fuel ratio.

Abstract: A fuel-air mixture supply system comprising a Venturi portion formed on the inner surface of a cylindrical suction system having a throttle valve therein, at least one fuel injection port provided in the Venturi portion and open into the suction system, an atomizing chamber located adjacently to the fuel injection port in a co-axial manner to the fuel injection port and having a nozzle to make the atomizing chamber communicate with the fuel injection port, a fuel injection valve connected to the cylindrical suction system to inject the fuel into the atomizing chamber at a predetermined pressure and an air bleed passage making the portion above the throttle valve in the suction system communicate with the atomizing chamber. The fuel injected into the atomizing chamber from the fuel injection valve is atomized by the air drawn into the chamber from the suction system through the air bleed passage.

Abstract: A method and apparatus for the preparation and control of an air-fuel mixture in which compressed air is divided into two streams, one of which is at a pressure taking into account engine load and existing atmospheric conditions and serves for supplying and sucking fuel and its preliminary atomization, the second stream serving for successive atomizations of fuel and correction of discharge while preventing secondary coagulation. The mixture is fed to the engine intake manifold, where it is further mixed with air sucked by the engine.