Abstract: Several embodiments of induction systems having forced induction and a regulated fuel pump for delivering fuel to the charge forming device at a pressure that is related to the pressure in the induction system. In some embodiments the pressure is sensed above the level of the fuel in the fuel bowl of the charge forming device, and in others the pressure is sensed in a plenum chamber upstream of the charge forming device inlet. A check valve arrangement is also provided in the fuel line in one embodiment for preventing the backflow of fuel under conditions when the engine is stopped.

Abstract: A fuel injection system for a multi-cylinder aircraft engine in which, in order to secure the fuel supply, a pressure-measuring device is connected to the feed line leading from the fuel tank to the fuel quantity distributor, into which are installed two parallel fuel pumps and a fuel filter; this pressure-measuring device in case of a predetermined pressure drop switches on the fuel pump which previously was not in operation; in case of an excessive pressure difference at the fuel filter which is measured by pressure-measuring device upstream and downstream of the filter, an electromagnetic valve installed into a bypass line to the fuel filter is opened; the soiling degree of the fuel filter is indicated by a hydraulically actuated difference pressure-measuring device with pressure limitation.

Abstract: The vane-cell pump of a fuel injection pump for internal combustion engines has one or more adjustable throttle restrictions disposed on the intake side and/or on the compression side.By adjusting the particular throttle restriction, the slope of the characteristic curve of the course of the supply pump pressure can be influenced. In this way, it is possible to effect an increase in the slope over the entire rpm range, an increase only in the upper rpm range, or a lesser increase in slope only in the upper rpm range. The invention contemplates several embodiments which essentially cover location of the throttle restriction in the fuel injection pump.

Abstract: A fuel injection pump for self-igniting internal combustion engines is proposed in which a metering piston operates synchronously with the engine and a distributor operates synchronously with a pump piston. During the intake stroke of the pump piston the distributor delivers a metered injection quantity to a work chamber associated with the pump piston, and during the compression stroke of the pump piston the metered injection quantity is distributed through injection lines to the engine injection nozzles. The metering piston is disposed upstream of the distributor so that high pressure conditions do not deleteriously effect the fuel metering. The stroke of the metering piston is adjusted electrically and controlled by a microprocessor unit to which engine operating characteristics are supplied.

Abstract: A fuel injection system for internal combustion engines having a multiplicity of injection valves which serves to provide fuel supply is proposed. The fuel injection system includes a common, rigid fuel line, having plug nipples into which the injection valves associated with the individual cylinders of the engine can be inserted in a sealing manner. The fuel line comprises one fuel distributor line and one fuel return flow line located one above the other. Each injection valve has one inlet stub and one outlet stub disposed concentrically relative to one another, protruding into the plug nipple in such a manner that the inflow stub communicates with the fuel distributor line and the outflow stub communicates with the fuel return flow line. As a result, not only is it possible to provide simple sealing toward the outside between the injection valve and the plug nipple but also rapid assembly of the fuel injection system is assured.

Abstract: A fuel feed system adapted to maintain at a constant value the pressure difference across a fuel measuring gate disposed in a fuel feed passage and control the area of opening of the fuel measuring gate in connection with the amount of air being sucked into an internal combustion engine so as to continuously measure the fuel, the measured fuel being concentratedly injected at a positive pressure into the suction pipe. The system comprises an accelerator pump interlocked to a throttle valve for injecting fuel at a positive pressure into the suction pipe during acceleration. The accelerator pump is fed with fuel sucked up from the return pipe of a pressure regulator which feeds the fuel measuring gate with fuel at a predetermined pressure.

Abstract: A fuel injection apparatus for use in a motorized two-wheeled vehicle comprising a vehicle body, front and rear wheels mounted thereon, a side stand mounted on one side thereof, and a multi-cylinder type internal combustion engine mounted on the center portion thereof. The engine includes plural cylinders positioned laterally with respect to the body, plural fuel injection nozzles, a fuel pump, and a delivery pipe for delivering fuel supplied from the fuel pump to the plural nozzles, wherein the plural nozzles are disposed laterally in the direction of the plural cylinders and the delivery pipe is disposed laterally in the direction of the plural nozzles. The engine further includes a fuel pressure regulator coupled to one end portion of the pipe, the one end portion being on the opposite side of the side of the vehicle body having the side stand.

Abstract: A diaphragm pressure regulator is proposed which serves to regulate a fluid pressure in a system having fluid flowing through it, and in particular to relate the fuel pressure in a fuel injection system. The diaphragm pressure regulator includes a valve diaphragm, which cooperates with a valve seat. The valve diaphragm separates a spring chamber having a system pressure spring from a system pressure chamber, into which the valve seat, which is axially displaceable and is supported in an axial bearing point, protrudes and which communicates with the fluid to be regulated. The end of the valve seat remote from the valve diaphragm is embodied as a valve plate and protrudes into a collection chamber, in which it opens a sealing seat toward a return flow line to a greater or lesser extent. A closing pressure spring engages the valve plate and urges the valve seat in the direction of the valve diaphragm.

Abstract: A single point fuel injection system for an internal combustion engine including a throttle body having first and second air intake throats corresponding to first and second intake manifold planes of the engine, the air flow through each throat being controlled by throttle plates positioned within each throat. The throttle body further includes a fuel accumulating bowl which is integrally formed with the throttle body, the bowl being enclosed by a diaphragm and cover member. Within the enclosure of the fuel bowl are positioned a pair of injectors which are adapted to inject pulsed portions of fuel through a sonic nozzle and into the air intake throat of the throttle body. The injection of pulses of fuel into the throat is timed in accordance with the sensing of the crankshaft reaching a position of 15.degree. before top dead center to enhance the distribution of fuel charge from cylinder to cylinder.

Abstract: A fuel system particularly useful with diesel fuel. The fuel is picked up through a fuel strainer system and pumped through a supply line to the engine. Excess fuel is returned to the fuel tank through a fuel return line. Since any water in the fuel separates from diesel fuel and settles in the bottom of the tank, the water must at times be removed. By extending the fuel return tube to the bottom of the tank a syphon tube is provided which can be connected to a pump to pump out the water. If the water in the bottom of the tank freezes, a bypass valve in the upper portion of the fuel return line, but within the tank, operates so that returned fuel may still be discharged in the tank. Two flexible bypass valve arrangements are shown, both using variations of a duckbill valve to provide a closed valve when syphoning or pumping of the water takes place.

Abstract: A fuel system for a mixture-compressing, spark-ignited four cycle internal combustion engine with charge stratification of the type wherein a major portion of the charge is introduced into a main combustion chamber as a lean fuel-air mixture by a main mixture forming system such as a carburetor and wherein the remainder of the charge is introduced into an auxiliary combustion chamber joined to the main combustion chamber via a firing channel by an auxiliary combustion chamber injection pump and injection nozzle is improved by the provision of only a single fuel feed pump which is connected to the fuel tank and supplies fuel from the tank directly to the injection pump at a first pressure and supplies fuel to the main mixture forming system via a pressure reducing valve at a second pressure that is lower than the first pressure.

Abstract: A pressure regulator for use in a fuel supply system such as might be found in a vehicle where fuel from a fuel tank is conveyed by a fuel pump to a carburetor is disclosed. The pressure regulator maintains the fuel pressure at the fuel pump outlet at a preferred level relative to atmospheric pressure and includes a regulator housing with a fuel inlet coupled to the fuel pump outlet and a fuel outlet coupled to the fuel system upstream of the fuel pump.

Abstract: A fuel pressure regulator for use in a fuel injection system for an internal combustion engine has a housing defining therein a fuel passage having upstream and downstream ends connected to a main fuel supply conduit and a fuel return pipeline, respectively. The fuel supply conduit is connected with fuel injectors at points upstream of the fuel pressure regulator. A first valve is provided in the fuel passage at a point downstream of a restriction also provided in the fuel passage. A fuel chamber is provided in the fuel passage between the restriction and the first valve. The first valve is opened when the fuel pressure in the fuel chamber exceeds a first predetermined pressure level to allow the fuel to flow from the fuel chamber to the return pipeline. A bypass fuel passage bypasses the restriction and has its downstream end connected to the fuel chamber.

Abstract: A distributor type fuel injection pump which includes a relief passage having one end thereof opening in the pump working chamber and the other end communicating with a zone under a lower pressure. Said relief passage is so arranged as to be permanently kept closed by a valve means which is actuated by a valve actuating means for actuating said valve means in response to a fuel supply pressure varying as a function of the engine rotational speed, except in a predetermined low engine speed range, to obtain a decreased injection rate during idling so as to increase the injection period. Thus, the rate of combustion of the engine is reduced to minimize the combustion noise.