Abstract: A fuel injection system for an internal combustion engine and a method of controlling fuel injection according to which a predetermined fuel quantity is delivered from a high-pressure pump to the internal combustion engine, first and second return flow quantity are returned through first and second relief ducts, the second relief duct including a control throttle having a constant cross-section, and an electronic control unit controls flow delivery in accordance with characteristic values including those of the internal combustion engine, the pump, and a quantity measuring device for measuring the second return flow, and in accordance with the predetermined fuel delivery quantity also used as a characteristic value.

Abstract: A fuel injection nozzle 10 having a nozzle body 12 to which is attached a banjo-type inlet stud 16, by means of heat shrinking. After the shrink fit attachment, a blind passage 20, 22 in the delivery tube portion 134 of the inlet is drilled through to penetrate the nozzle body and form a leak-tight fuel delivery path. A locating plate 106 is supported by a bore 96 in the cylinder head 80 adjacent the nozzle and orients the nozzle into a preselected orientation. In one nozzle embodiment 70, the tip 76 is sealed against the cylinder head socket 84 by a frustoconical copper annular seal member 82 that is preferentially loaded toward the inner seal diameter. The nozzle cap 14 forms a spring chamber in which a spring subassembly 42 including upper and lower spring seats 48, 46, a spring 44, and stem 186 and pedestal 84 piloting the spring, cooperate to permit independent setting of the valve lift off stop limit F and the spring preload B.

Abstract: A fuel injection rate control apparatus for a V-engine, formed so that the rational speed of the engine can be prevented from varying when the engine is inclined forward or backward, even if a commonly mass-produced inexpensive governer is used. This control apparatus has a fuel injection pump (1) provided with a governer (2) and mounted on one side portion of a cylinder block, a governer-free fuel injection pump (1') mounted on the other side portion of the cylinder block, and a link mechanism consisting of a connecting shaft (4.sub.1) provided in front of the two fuel injection pumps so that the connecting shaft can be turned freely so as to transmit the movement of a rack rod (3) of the governer-carrying fuel injection pump (1) to a rack rod (3) of the other fuel injection pump (1'), a pair of levers (4.sub.2-1, 4.sub.2-2) fixed to both sides of the connecting shaft so as to project in the opposite directions, and a pair of links (4.sub.3) connecting these levers and two rack rods together.

Abstract: A fuel injection pump for internal combustion engines, in which both a shift of the injection onset to early during cold starting or when the engine is not yet up to operating temperature can quickly become operative, and a fuel injection quantity adaptation device is operative unaffected by the control criteria for the cold-starting shift to early. To this end, a work chamber of an injection adjuster is acted upon separately by the feed pressure of a fuel feed pump prevailing upstream of a temperature-dependently unlockable pressure maintenance valve, and the pressure-controlled interior of a fuel injection pump supplying the adaptation device is connected to the outlet side of the pressure maintenance valve.

Abstract: A fuel-vapor purge and air-fuel ratio control system controls the amount of fuel vapor to be purged under an engine vacuum into a carburetor of an automotive engine from a charcoal canister and also controls the air-fuel ratio of an air-fuel mixture to be supplied to the carburetor. The fuel vapor is purged form the charcoal canister by applying the engine vacuum to the charcoal canister only when the air-fuel ratio is controlled. The applied engine vacuum may be regulated to control the amount of purged fuel vapor to change in proportion to the amount of air drawn by the engine, or the amount of purged fuel vapor may be increased to an upper limit when the air-fuel ratio is in a normal air-fuel ratio control region, and the amount of purged fuel vapor may be reduced to a lower limit when the air-fuel ratio is outside the normal air-fuel ratio control region.

Abstract: Fuel injection arrangements having pneumatically driven injection pumps utilize the fluctuating crankcase pressure whereby the injection time point is fixed by the system. The injection time point can be fixed so as to depart from the course of the pressure in the crankcase if the crankcase pressure is applied to the injection pump via an opening controlled by the piston and if the pressure drop is directed to the combustion chamber via a relief opening. However, it has been shown that this kind of control produces considerable problems with respect to fast-running two-stroke engines. Accordingly, it is a feature of the invention to provide a check valve in the connection between the relief opening and the injection pump and to position this check valve so that it opens in the flow direction toward the combustion chamber.

Abstract: The invention relates to a distribution and control valve in a fuel injection engine pump especially for a large multi-cylinder diesel engine, in which the fuel is injected into the cylinder by mdans of two or more injection valves (A;B). The pump includes a pump cylinder (1) and, inside thereof in a pump chamber (2), a reciprocatingly movable piston member (4), which is arranged through its movement to feed fuel via distribution ducts to the injection valves of the cylinder in question. The pump cylinder (1) is provided with an extra chamber (11) connected to the pump chamber (2), to which extra chamber there is tightly adapted a long-shaped valve member (12) following the movements of the piston member in the axial direction thereof, and inside the valve member (12) there is a fuel duct (13) connected to the pump chamber (2). The feed ducts (16;5a,5b) of the separate valves are connected to the extra chamber (11) in the axial direction of the valve member (12) to different points distant from each other.

Abstract: A fuel-injection pump for diesel-engine injection system, comprising at least one cylinder-piston unit with an associated intake valve for the introduction of fuel delivered by an electrical supply pump, and a delivery duct. Electronic means are provided for modulating the electrical supply pump to vary the pressure of the fuel taken in by the cylinder-piston unit and consequently the bottom dead center position of the piston and hence the length of its pumping stroke.

Abstract: A fuel delivery system for automotive engine and like applications comprises a canister for positioning within a fuel tank so as to be surrounded by fuel in the tank. An electric-motor fuel pump has an inlet and an outlet for feeding fuel under pressure from the tank to the engine. Excess fuel is returned from the engine to the canister. A fuel level sensor includes a pressure sensor positioned at a lower portion of the canister and responsive to head pressure within the canister and within the surrounding tank for providing an electrical signal as a function of a difference between such pressures. An indicator is responsive to such electrical signal for displaying tank fuel level to an operator.

Abstract: A fuel delivery system for internal combustion engines in which an electric-motor fuel pump supplies fuel under pressure from a tank to a fuel injector carried by the engine, and excess fuel is returned by a pressure regulator from the engine to the supply tank. A restriction is positioned in the fuel return line to restrict flow of return fuel therethrough, and thereby create a back-pressure of fuel in the return line. A pressure sensor is coupled to the return line between the pressure regulator and the restriction and drives the fuel pump as an inverse function of fuel pressure in the return line, and thus as a direct function of fuel demand at the engine.

Abstract: In the embodiment described in the specification, a fuel injection system has a device for proportioning and distributing fuel to the individual cylinders of an internal combustion engine. The proportioning and distribution device has a distribution rotor driven in proportion to the speed of the engine. The distribution rotor is formed with high-pressure channels which communicate with a high-pressure chamber of a pressure pump for selective connection to the fuel injection lines leading to the cylinders of the engine. To control the termination of fuel injection in each cylinder, the distribution rotor has a control valve for connecting the high-pressure channels with the atmosphere. The control valve includes a sealing member actuable by a roller tappet which is mounted in a transverse bore of the distribution rotor. The roller tappet cooperates with a lifting ring surrounding the distribution rotor having camlike projections which are displaceable in the peripheral direction in the rotor housing.

Abstract: An ignition signal distributing circuit for a multicyclinder engine in accordance with the present invention comprises a delay circuit which delays an output signal of a crank angle sensor or a cranking switch signal for the duration until the first output signal of the crank angle sensor is completed in the early stage of the time immediately after a starting of power supplying, and thereby an output of an error ignition signal can be prevented which is caused by that the crank angle sensor outputs a detection signal when power supplying is started.

Abstract: A fuel-injection pump comprises a pump cylinder, a pump plunger formed with a first relief duct opening into a working space and also opening radially at a first outlet opening into a relief space, and a drive for periodically rotating and axially reciprocating the plunger. An annular slide on the plunger can cover the first outlet opening so that a speed controller can axially shift the slide and thereby vary the venting of the working space into the relief space. An annular groove formed in the cylinder opens inward toward the plunger and a second outlet opening from the first relief duct also opens at the groove. A second relief duct formed in the plunger and opening at a respective second outlet opens at the groove and the second outlet openings are relatively spaced such that during a partial stroke of the pump plunger they communicate with each other via the groove.

Abstract: The device comprises substantially an integral connection block for connection to an air manifold and to an engine wall; in said block there is provided a plurality of pairs of main air feed holes, one hole of each pair being controlled by a throttle valve; in the block there is also provided a series of supplementary idling air ducts the passage of which is controlled by a solenoid modulating valve housed in a suitable seat in the block. On the block there is also provided a series of seats for the injectors, and a pair of ducts for feeding fuel to the injectors and for its recirculation. Finally, on the block there are provided further seats for a fuel pressure regulator and for a pneumatic actuator arranged to control said throttle valves by way of a transmission.

Abstract: A solenoid is affixed to a bracket having a base complementary in configuration to a portion of the housing of a diesel engine fuel pump governor that is spaced from the governor's run/stop member; the bracket is mounted on the governor housing by two bolts that also serve to join two halves of the governor housing. A lever mounted on the run/stop member of the governor is connected, by a connecting rod and swivel connection, to the solenoid plunger, so that plunger movement responsive to energization of the solenoid rotates the run/stop member to a RUN position; on de-energization of the solenoid its spring drives the run/stop member to a STOP position. A support rod affixed to the center of the bracket and mounted to the governor housing by a cover mounting bolt braces the bracket against engine vibration.

Abstract: A throttle body adapted to be mounted between an intake pipe and an intake manifold, the throttle body comprising an upstream body connected to the intake pipe and formed with a substantially horizontal suction passage; a downstream body connected to the intake manifold and formed with a downwardly inclined throttle bore, the throttle bore continuously extending from the suction passage on a downstream side thereof; a throttle valve rotatably mounted in the throttle bore of the downstream body; and a fuel injector mounted to the upstream body in such a manner as to inject fuel toward the throttle valve; wherein the fuel injected from the fuel injector collides with the throttle valve to be atomized and distributed in the downstream body, and is supplied to the intake manifold.

Abstract: A governor for fuel injection pumps, said governor having two or three cooperating levers used to move a fuel injection quantity control slide. A regulating spring and the idling spring engage the drag lever. A start spring is disposed between the drag lever and the start lever, the start spring is opposed by the force of a flyweight assembly which is speed-dependent. When starting the combustion engine, the start lever, which is connected to the drag lever via a pivot pin, is in an initial position corresponding to a setting of the quantity control slide, which setting is smaller than the full injection quantity. When starting, the quantity control slide is displaced through a first control range to deliver a greater quantity of fuel, up to the full load injection quantities. Thereupon, when instituting a decrease, further displacement of the flyweight assembly results in the quantity control slide being displaced through a second control range in the direction of smaller quantities of fuel.

Abstract: For supplying fuel from a fuel tank to an internal combustion engine by a fuel supply pump, a fuel delivery pressure of the fuel supply pump is regulated by a pressure regulating valve so as to maintain the difference between the fuel delivery pressure of the pump and an inner pressure of an intake manifold of the engine at a prescribed constant value, and the delivery volume of fuel from the pump is controlled in response to the fuel delivery pressure so as to minimize the amount of surplus fuel produced by the pressure regulating operation of the pressure regulating valve.

Abstract: A fuel pumping apparatus of the rotary distributor type includes an accumulator volume into which fuel can be spilled to terminate delivery of fuel by the apparatus. The accumulator is defined by a movable member in the form of a sleeve which is slidable on an extension of the distributor member and has a closed end. The extension defines a seating with which can be engaged by a valve element defined by the sleeve. The extension and sleeve define an annular space connected to the pumping chamber of the apparatus and mechanical means is provided to effect initial movement of the sleeve against the action of a spring to lift the valve element from the seating to allow fuel flow into the accumulator volume.

Abstract: A fuel pump driving apparatus for a vehicle, comprising a fuel pump, a blocking oscillator, including a transistor and a bias circuit therefor, for driving the fuel pump, and a control circuit for controlling an oscillating operation of the blocking oscillator. The control circuit drives the blocking oscillator upon reception of an ignition pulse generated from an ignition coil in accordance with rotation of an engine. The control circuit is constituted by a silicon controlled rectifier whose input side is series-connected to a bias circuit of the blocking oscillator, and circuit means, connected to the gate of the silicon controlled rectifier and including a Zener diode, for voltage-dividing the ignition pulse. The bias circuit for the transistor of the blocking oscillator is designed to set a current which is flowed therethrough when the transistor is OFF to be lower than a holding current of the silicon controlled rectifier.