Abstract: An adapting mechanism for controlling the speed of a variable speed fuel pump in a returnless fuel delivery system includes a demand sensor, feedforward fuel pump values, adaptive adjustments corresponding to the feedforward values, a pump controller which controls the speed of the fuel pump, a timer, a steady demand indicator, a flow error accumulator, and an adjustor. The system chooses a feedforward value which corresponds to the engine's fuel demand and combines it with the corresponding adaptive adjustment to drive the fuel pump. The system monitors the average flow error over a time interval throughout which the fuel demand is substantially steady and modifies the adaptive adjustments to reduce any error offsets beyond a predetermined acceptable level.

Abstract: A power device for driving an auxiliary equipment for an internal combustion engine capable of driving both a fuel injection unit and a valve without specifically providing a adjusting valve when the engine includes no battery acting as a power supply. A generator driven by the internal combustion engine is provided therein with a generating coil for driving the auxiliary equipment which is common to both a pump motor and an actuator. A driving power feed circuit is arranged for feeding driving power to the pump motor and actuator from the generating coil for driving the auxiliary equipment which acts as a power supply. The driving power feed circuit includes a pump driving switch for switching a driving current of the pump motor, an actuator driving switch for switching a driving current of the actuator, and a switch control unit for turning on the pump driving switch and actuator driving switch at duty ratios different from each other, respectively.

Abstract: A motor-vehicle engine system has an internal-combustion four-cycle engine having a fuel-supply manifold and operable at variable speed with a fuel requirement dependent on speed, a substantially closed but vented fuel tank holding a supply of gasoline, a fuel pump having an input connected to the tank and an output, and a fuel-feed line connected between the fuel-pump output and the fuel-supply manifold. A controller connected to the engine and to the pump operates the fuel pump at a throughput rate equal to between 5% and 40%, preferably 10% to 30%, more than the instantaneous fuel requirements of the engine. A return line connected to the fuel tank is provided with an overpressure valve that opens and returns to the tank fuel in the manifold that is in excess of the engine's instantaneous requirements and thereby maintains a predetermined constant pressure in the fuel-supply manifold.

Abstract: A basic discharge QK Of a fuel pump is determined based on an engine load and an engine rotational speed, and further a correction amount QG for correcting the basic discharge QK based on comparison of an actual fuel pressure PT with a target pressure Po is learnt for every driving conditions. Then, the basic discharge QK is corrected with the correction amount QG, whereas in a transient condition, the basic discharge QK is corrected with a transient correction amount QT set on the basis of a variation rate .DELTA.PT Of the fuel pressure PT. Thus, it is possible to ensure that an amount of fuel required by an engine is surely supplied without excess fuel supply from the fuel pump.

Abstract: A method of operating a fuel system having a fuel pump (15) to supply fuel to a fuel metering apparatus (23) operable to provide metered quantities of fuel for injection to an engine, and an electronic controller (22) responsive to a plurality of input signals to determine the engine fuel demand and to control the activation of the fuel metering apparatus ( 23 ) to deliver a quantity of fuel to meet said fuel demand. The method comprising maintaining a fuel supply to said fuel metering apparatus (23) within predetermined fuel pressure or fuel level parameters, and cyclically operating said fuel pump-to maintain said fuel supply within said parameters. Further providing a signal from the sensor (18) to an electronic controller (23) indicative of the pressure of the fuel supply at the fuel metering apparatus (23) as one of said input signals to be processed by the electronic controller (23) in the control of the fuel metering apparatus (22).

Abstract: A pump module that controls and varies the pressure of a fluid within a hydraulic system. The module includes a housing which has an inlet port, an outlet port and a return port. The inlet port is typically coupled to a pump. The return port is typically connected to a fluid reservoir. The outlet port is typically connected to a working device such as the fuel injector of an internal combustion engine. The module contains a spring loaded variable volume accumulator which maintains the fluid pressure at the outlet of the module. The module also has a three-way valve that provides fluid communication between the inlet port and the outlet port when in a first position, and fluid communication between the inlet port and the return port when in a second position. The module further includes a pressure transducer that senses the fluid pressure at the outlet port and provides a corresponding pressure feedback signal to an electronic controller.

Abstract: The invention pertains to a fuel injection device operating according to the solid state energy storage principle, whereby a piston element mounted in a pump cylinder of an electromagnetic reciprocating pump, displaces quantities of the fuel to be injected during a virtually resistanceless acceleration phase during which the piston element stores kinetic energy, before the ejection in the pump area. The displacement is stopped suddenly with the means for interrupting the displacement, so that a pressure impulse is generated in the fuel contained in a closed pressure chamber by direct transfer of the stored kinetic energy of the piston element to the fuel in the pressure chamber. The pressure impulse for the ejection of fuel is used by an injection device, whereby the means for interrupting the displacement and producing the pressure impulse are arranged outside the leading liquid-tight contact area between piston element and piston cylinder of the reciprocating pump.

Abstract: A system for controlling an electric fuel pump housing a DC motor therein for an internal combustion engine using a gasoline-alcohol blend fuel. A switchover line is preestablished with respect to alcohol concentration in the fuel and operating condition of the engine such as an engine load, an engine speed or both the engine load and engine speed. If the detected condition exceeds the switchover line in a high engine load, a relay is energized so that battery voltage is supplied to the motor through a line bypassing a resistor provided at an initial power supply line. Voltage and hence current applied to the motor is thus increased to raise pump speed higher. Although the system construction is simple and low-cost, sufficient fuel can be supplied at the high engine load.

Abstract: In a low pressure continuous flow fuel injection system for an internal combustion engine, an electric fuel pump (18) is energized with a variable duty cycle to vary the pumped volume output of the pump according to engine fuel requirements. The duty cycle is varied to energize the pump to pump substantially only the amount of fuel required by the engine, such that at idle or low engine speed, the pump is energized a lower percentage of the time than at high engine speed. Fuel flow through the fuel injector (12) is continuous, but energization of the pump is not, such that the pump is not pumping at full capacity when unneeded. An electric idle air control valve (54) is also energized with a variable duty cycle to vary the amount of bypass idle air supplied to the intake manifold (10).

Abstract: A surface array of electrically actuated pulsed microscopic fuel jets arranged on the interior surface of a mixing chamber injects fuel into air to form a combustible air-fuel mixture. The jets are solid state units with no moving parts, which can be actuated individually or in groups, and the volume of fuel injected per each jet's firing pulse can be varied by changing the characteristics of the electrical actuating pulse. Having no moving parts and being electrically activated, the jets are intrinsically suited to direct computer control. By providing a large number of such jets and a means of their direct electronic control via negative feedback, fine control of the operating parameters of the combustion engine and a high degree of redundancy to compensate for the failure of individual jets is made possible. The lack of moving parts and the absence of a high pressure fuel supply system provide significant advantages in performance, cost, reliability, and safety over the prior art in fuel injection.

Abstract: An engine fuel injection system is provided, wherein pumping maximum possible fuel required by the engine and by-passing excess fuel not used by the engine are eliminated, the speed of the variable speed electric fuel pump for the system being controlled so as to pump only the quantity of fuel required to operate the engine under certain sensed engine and/or ambient operating conditions, such control being provided by a fuel pressure sensor/electronic pump motor speed control.

Abstract: A fuel delivery system for an internal combustion engine that includes a fuel supply, an electric-motor pump for feeding fuel under pressure from the supply to an engine, and electronic control circuitry for applying electrical power to the pump. The control circuitry includes a pressure sensitive switch coupled to the pump and responsive to pump outlet pressure for switching between conductive and non-conductive switch conditions at a preselected pump outlet pressure. A pulse width modulation amplifier is coupled to the switch for applying pulsed d.c. energy to the pump at a first average voltage level when the pressure switch is in one condition, and at a second lesser but non-zero level when the pressure switch is in the other condition. In this way, electrical power is applied to the pump motor at a reduced level when pump outlet pressure exceeds the threshold level of the pressure switch.

Abstract: A fuel pressure regulator for a no-return fuel system for an automotive engine with fuel injectors having a housing with a flexible diaphragm between first and second chambers. The second chamber has a fuel inlet receiving fuel from a fuel pump with a spring biased valve therein to admit fuel to the second chamber and an outlet to supply fuel to the engine. The second chamber is in continuous communication with the engine to accumulate any fuel expansion that may occur during engine deceleration or when the engine is turned off due to heating the fuel. The first chamber continuously communicates with the engine air intake manifold so that fuel is supplied to the engine fuel injectors at a substantially constant pressure drop across the injectors. An over-pressure relief by-pass valve responsive to pressure at said fuel inlet will by-pass fuel to a reservoir when pressure in said second chamber opens said spring biased valve.

Abstract: A vapor separating unit for a fuel system and having particular application to a fuel system for a marine engine. The vapor separating unit includes a closed tank having a fuel inlet through which fuel is fed to the tank by a diaphragm pump. The liquid level in the tank is controlled by a float-operated valve. An electric pump is located within the vapor separating tank and has an inlet disposed in the tank and an outlet connected to a fuel rail assembly of the engine. Excess fuel from the fuel rail assembly is conducted back to the upper end of the vapor separator tank. A vapor venting mechanism is incorporated in the tank to vent vapor from the tank.

Abstract: A feedforward control system for an electrically operated fuel injection pump for an internal combustion engine includes a controller for determining required fuel pressure and flow rate to be delivered by the pump and for using the determined fuel pressure and flow rate to determine a variable operating voltage for the pump. The variable operating voltage may be delivered as a pulsewidth modulated voltage, with the system being used to operate the pump in an open loop fashion.

Abstract: A fuel pump manifold for a no-return fuel system for an automotive engine. The manifold has inlet and outlet passages with a check valve which opens when fuel is supplied to the engine and closes to prevent reverse flow of fuel when the outlet pressure is greater than the inlet pressure and a vent valve between the outlet and inlet and in parallel with the check valve which is normally closed and opens when the outlet pressure exceeds the inlet pressure by at least a predetermined minimum value which is usually the desired minimum pressure of fuel supplied to the operating engine when idling. Preferably, a normally closed pressure relief valve also communicates with the outlet to relieve overpressure of the outlet fuel supplied to the engine.

Abstract: A non-return fuel distribution system or deadheaded fuel distribution system for an internal combustion engine having one or more fuel injectors mounted on a fuel rail on the engine, has a fuel pressure transducer mounted on the fuel rail to sense the fuel pressure in the rail and generate an electrical signal representing such pressure. The electrical signal is combined in a controller to operate an electrically operated variable pressure fuel pump to generate and maintain the fuel pressure necessary to operate the electrically operated fuel injectors in their linear operating pulse range.

Abstract: A control system is described for the electric fuel pump of an internal combustion engine, with a sensor for the speed of a shaft of the engine and with a logic circuit for providing a shut off signal for the pump, depending on the speed detected, where the signal of a further sensor (14) for the speed is supplied to the a logic circuit (16, 17), and where shut off then takes place only when both speed signals deviate from a specified range. In this way, it is ensured that the vehicle remains drivable if one of the two sensors (13) or (14) fails.

Abstract: A fuel delivery arrangement for a fuel injected engine 12 has a single fuel line 16 extending from an in-tank fuel pump 14 to a fuel rail 18. Included within the fuel line 16 is a check valve 24 which allows fuel flow from the tank to the fuel rail but which prevents return flow while allowing any trapped fuel between the fuel rail and the check valve to expand to reduce pressure.

Abstract: A fuel delivery system for an internal combustion engine that includes a fuel supply, an electric motor pump for feeding fuel under pressure from the supply to the engine, a pressure sensitive switch operatively coupled to the pump and having a first contact movably responsive to fuel pressure and a second contact opposed to said first contact, and a PWM amplifier responsive to the pressure sensitive switch for applying electrical power to said pump. The second switch contact is mounted on a bimetallic spring responsive to fuel temperature for altering operating characteristics of the switch, and thereby altering fuel pressure characteristics of said system as a function of fuel temperature.

Abstract: An electrohydraulic device, particularly an electric fuel pump for motor vehicle comprises a housing, a hydraulic connecting pipe and at least one electrical connecting plug for hydraulic medium and current supply respectively, a hydraulic conduit and a current cable extending to the housing, and a plug head. The hydraulic conduit and the current cable are connected with the plug head. The plug head is fitted over the connecting pipe and the connecting plug so as to establish hydraulic and electrical connection between the hydraulic conduit and the connecting pipe on the one hand and the current cable and the connecting pipe on the other hand.

Abstract: A pump control apparatus is disclosed which is of a small size, quietly operates and has a small number of signal output lines without loosing the fuel pump stopping function upon engine stall. This control apparatus of the invention includes a computer 5 which provides a signal output line 9 with an off-signal that is equal to the potential of a body 7 of a vehicle upon engine stop, and which provides the signal output line 9 with a drive signal that is higher in potential than the off-signal upon engine operation. This control apparatus further includes an FET 12 which is connected in series with a power supply line 8 and a fuel pump 4 and which, when receiving the drive signal, changes the terminal voltage of the fuel pump 4 in accordance with the input drive signal, and when receiving a voltage corresponding to the off-signal, stops the fuel pump 4.

Abstract: A fuel pump control circuit includes an SCR for controlling, after turning on of an ignition switch, power supply from a power source to a fuel pump circuit for driving a fuel pump (this SCR being turned on by a gate current supplied from the power source through a first conduction path), a timer circuit for shunting the gate current, which flows into the first conduction path, to a second conduction path when a predetermined time elapses after turning on of the ignition switch, and a current limiting resistor inserted in the first conduction path.

Abstract: A controller for a vehicle fuel pump electric motor is connected to one or more vehicle sensors for sensing fuel flow demand and pulse width modulating the motor to control the speed. A fuel demand sensor and a triangle generator are connected to a summing controller for generating a pulse width modulated control signal to a driver. The driver has a pair of outputs for generating a pair of complementary pulse width modulated switch signals to a pair of switches whereby the switches are switched on and off alternately. One of the switches is connected in series between a power supply and the motor armature and the other switch is connected across the armature. A crash sensor, such as an inertia switch, is connected to the summing controller for terminating pulse width modulation in the event of a crash. The switch connected across the armature can be turned on to short circuit the armature and quickly stop the motor in the event of a crash.

Abstract: A fuel injection equipment including a fuel injector for injecting fuel into a fuel injected space of an internal combustion engine and a fuel pump is disclosed. A generator which is driven by the internal combustion engine and has characteristics of being increased in output voltage or output current with an increase in engine rotation speed is used as any one of an injector driving power supply for feeding the fuel injector with an exciting current through an injector trigger circuit and a fuel pump driving power supply. Use of the generator as the power supply permits the fuel injection equipment to be controlled without requiring a complicated control circuit.

Abstract: The proposed fuel injection system for gasoline engines eliminates or reduces the excessive fuel by-pass of current systems by use of an engine driven fuel pump or by modulating fuel pump speed and fuel delivery so as to be directly proportional to engine speed.

Abstract: A fuel consumption measuring device is provided with a flow meter which is mounted on a fuel feeding passage extending from a fuel tank to an engine, wherein a return fuel which is not consumed by the engine is returned to a passage in the downstream of the flow meter through a return passage so as to measure a fuel consumption in the engine by the flow meter. The fuel feeding passage is provided with a pressure reducing valve for maintaining a confluence of the fuel feeding passage and the return passage at atmospheric pressure. Therefore, the fuel consumption measuring device has high measuring accuracy and high security, and is suitable for a vehicle.

Abstract: A fuel pressure regulator with a flexible diaphragm defining in part first and second chambers in a housing and moving a ball valve in the first chamber to open and closed positions to regulate pressure of fuel discharged from the first chamber through an outlet having a seat on which the ball is received when the valve is closed. A cage carried by the diaphragm cooperates with a carrier member or disc fixed to the ball to provide a lost motion coupling between the diaphragm and the ball valve. This coupling permits movement within predetermined limits of the diaphragm generally axially, radially and pivotally relative to the ball while it remains on its seat and upon further generally axial movement of the diaphragm opens and partially closes the ball valve to regulate and maintain substantially constant the pressure of fuel discharged from the chamber over substantially the full range of the rate at which the fuel is discharged.

Abstract: A returnless fuel delivery control system is disclosed which regulates fuel rail pressure at the level needed for precise control of fuel mass flow to fuel injectors at both normal and elevated engine temperatures. This regulation is accomplished by precisely controlling the speed of the fuel pump motor as a function of the projected fuel demand based on engine RPM and injector pulse width. The projection is modified as a function of differential pressure error. The differential pressure error responds to a fuel temperature strategy which increases the target differential pressure as a function of fuel temperature.

Abstract: A control apparatus for an alcohol engine of a vehicle, the engine having an auxiliary equipment and using a fuel containing alcohol, comprising: an alcohol concentration sensor for outputting a detection signal corresponding to an alcohol concentration of the fuel; alcohol concentration calculating means responsive to said detection signal for calculating said alcohol concentration; determining means responsive to said alcohol concentration for computing an optimum condition to operate the auxiliary equipment; and driving means responsive to said optimum condition for driving the auxiliary equipment.

Abstract: An apparatus comprising a fuel pump, an internal combustion engine having an oil pressure and including an engine block and a crankshaft rotatably supported by the engine block, the apparatus further comprising structure for providing a first electrical signal while the engine is running, a starter selectively operable to rotate the crankshaft, structure for providing a second electrical signal while the starter rotates the crankshaft, and structure for causing the fuel pump to supply fuel to the internal combustion engine only while at least one of the first and second signals is present and without regard to the oil pressure of the internal combustion engine.

Abstract: A fuel delivery system for an internal combustion engine that includes a fuel supply with a pump responsive to application of electrical power for supplying fuel under pressure. A fuel injector is coupled to the supply for controlled delivery of fuel from the supply to the engine. A check valve is positioned in the fuel line that connects the pump outlet to the injector to prevent reverse flow of fuel from the injector to the pump when the pump is shut down. A sensor is coupled to the fuel line between the check valve and the pump outlet for providing an electrical signal as a function of fuel pressure at the pump outlet, and electronic control circuitry applies electrical power to the pump as a function of such pressure signal.

Abstract: The fuel supply system of an internal combustion engine delivers liquid fuel to electrically operated fuel injectors by means of an electric pump whose output pressure is regulated by control electronics which receives as feedback from a pressure sensor connected into a fuel delivery passage serving the injectors a signal representing the pressure differential between manifold absolute pressure (MAP) and absolute pumped fuel pressure. The pressure sensor has a movable wall that divides its interior into an intake manifold pressure sensing chamber space communicated to the engine intake manifold and a fuel pressure sensing chamber space communicated to the fuel delivery line to the injectors. A magnet is mounted on a central region of the movable wall to transmit a signal to a Hall-effect sensor mounted within the intake manifold pressure sensing chamber space. The feedback pressure signal is derived from the Hall-effect sensor sensing the position of the magnet, and hence that of the movable wall.

Abstract: A two-cycle internal combustion engine includes two opposed pistons reciprocatable within a cylinder, between which an air-fuel mixture is injected and ignited. One of the pistons, a compression piston, is connected to a rotatable flywheel for storing energy from reciprocation of the compression piston during the adiabatic expansion stroke. The other piston, a power piston, is attached to a pump piston which operates in a hydraulic pump to displace a hydrostatic fluid at a constant reaction pressure but at a variable stroke. Work is removed from this engine through the hydrostatic fluid, which can be fed to a hydrostatic drive unit. The flywheel is not connected to the primary load, but is used principally to drive the compression piston upward during the compression stroke of the engine. During the compression stroke, the air-fuel mixture is compressed and ignited to a pressure determined by the hydraulic reaction pressure in the hydraulic pump.

Abstract: A control apparatus for an electric fuel pump of a motor vehicle having an internal combustion engine which receives operating fuel from the motor operated fuel pump includes a dc-dc converter connected between a power source and the fuel pump. The dc-dc converter provides power for driving the fuel pump and is responsive to a voltage demand signal for setting the voltage level of the power. In one embodiment of the invention, a voltage demand signal generator, which generates the voltage demand signal, is a zener diode for generating a fixed voltage level for the power independent of the voltage level of the storage battery. In a second embodiment, the voltage demand signal generator is a portion of an engine control circuit for generating a varying voltage level for the power which is dependent on the operating conditions of the internal combustion engine.

Abstract: A solenoid operated valve controls the pressure of fuel supplied to a fuel injector. The fuel pressure is determined in accordance with the engine operating conditions. A driver is provided for operating the solenoid operated valve for setting the fuel pressure. The fuel pressure is increased as the load on the engine increases.

Abstract: This invention relates to a novel device for compressing and injecting gaseous fuel from a variable pressure gaseous fuel supply into a fuel receiving apparatus. More particularly, this invention relates to an intensifier-injector which compresses and injects gaseous fuel from a variable pressure source into the cylinder of a positive displacement engine. An intensifier-injector for gaseous fuels in internal combustion engines comprising means which utilizes the compressed gas from the chamber of the internal combustion engine or compressed fluid or gas from an external compressor to drive an intensifier means which raises the pressure of fuel gas supplied to the internal combustion engine for rapid late-cycle injection into the cylinder of the internal combustion engine.

Abstract: An apparatus for delivery of fuel from a storage tank to an internal combustion engine of a motor vehicle includes a pot-shaped container secured in the storage tank and a pump for delivery fluid from the storage tank into the container. An electric motor drives the pump. A second pump driven by the same electric motor delivers fluid from the container to the internal combustion engine. The second pump is located with the electric motor in a common housing. A pumping chamber is formed at an outer side of the bottom of the container, and the first mentioned pump has a delivery member located in the pumping chamber and driven by this electric motor.

Abstract: The motor drive circuit has an instrumentation amplifier with a programmable gain set by selectively blowing fuses during initial circuit calibration. The quasi-sawtooth waveform of a relaxation oscillator is compared with the amplified and conditioned signal produced by a pressure responsive Wheatstone bridge circuit. The result of this comparison is a drive signal which controls the pump motor speed. Radio frequency interference is minimized by storing the motor drive current in a capacitor located near the motor. Further interference is minimized by a reactive matching circuit which combines with the motor impedance to result in a purely resistive load.

Abstract: A fuel supply system comprising a main tank for storing a fuel; a subtank provided in the main tank for storing a part of the fuel; a first communication line for communicating the main tank to the subtank; a first pump provided in the first communication line for supplying the fuel from the main tank through the first communication line to the subtank; a first mechanism provided downstream of the first pump in the first communication line for limiting an amount of the fuel to be supplied from the first pump to the subtank and maintaining a level of the fuel to be stored in the subtank; a second communication line for communicating the subtank to an engine; a second pump provided in the second communication line for supplying the fuel from the subtank through the second communication line to the engine; a fuel return pipe for returning an uncomsumed part of the fuel from the engine to the subtank; and a second mechanism for regulating an amount of the fuel to be supplied from the second pump to the engine acc

Abstract: A fuel delivery system for an internal combustion engine that includes a fuel supply with a fuel pump responsive to application of electrical power for supplying fuel under pressure to fuel injectors mounted on the engine. A pressure sensor is coupled to the pump/injector fuel delivery line for measuring fuel delivery pressure. A second sensor is positioned within the fuel tank and is responsive to fuel alcohol concentration. The pump motor is energized by a pulsed d.c. signal having a duty cycle that varies as a combined function of the pressure and alcohol-concentration sensor output signals so as to maintain constant fuel pressure at the injectors while automatically compensating quantity of fuel delivered by the injectors for differing fuel alcohol concentrations.

Abstract: An in-tank fuel module adapted to be mounted within a fuel tank of predetermined vertical dimension through a circular opening in an upper wall of the tank. The module includes a canister having a one-piece hollow cylindrical external wall of blow-molded plastic construction and of diameter to fit through the tank wall opening. Circumferential convolutions that extend around the wall form axially resilient bellows in the canister wall, and a fuel inlet is disposed at the lower portion of the canister. A cover is fastened to the upper edge of the canister, and is dimension to close the opening in the tank top wall with the canister extending vertically through the tank. The canister is axially dimensioned with respect to the vertical dimension of the tank so that the bellows in the canister sidewall are axially compressed and resiliently hold the lower portion of the canister against the bottom wall of the tank.

Abstract: A fuel injection system having a novel electromagnetic-actuated fuel pump in which four pumping elements, equally-spaced around a camshaft are mounted such that a pair of opposed pumping elements alternate to deliver pressure to a high pressure common rail with a second pair of pumping elements. In one embodiment of the invention the pumping elements are mechanically actuated, in another they are electronically actuated. The high pressure common rail is adapted to reduce surges in the fuel pressure from the pump up to levels of 20,000 psi. The common rail has a relief valve for controlling the maximum pressure in the common rail chamber. The electromagnetic injection nozzle has a needle valve that is closed by pressure in a balancing chamber having a reduced pressure level less than that of the pressure required to open the valve.

Abstract: An electric motor driven fuel pump for a motor vehicle includes a tubular metal housing, a pump in the housing at an inlet end thereof, an electric motor in the housing adjacent the pump, a plastic end cap in the housing near a discharge end thereof, and a plastic RFI module in the housing over the end cap. Brushes for the motor are disposed in brush passages in the end cap and connected to brass terminal studs press fitted into the open ends of the brush passages. The plastic RFI module completely shrouds the terminal studs on the end cap to minimize corrosion and contamination and has a pair of flat metal contact plates embedded therein. An edge of the tubular housing is crimped over the outside diameter of the RFI module and overlaps the metal contact plates so that the plates reinforce the RFI module against forces urging dislodgment of the RFI module and the end cap from the tubular housing.

Abstract: In a fuel supply control system for an internal combustion engine, a voltage value to be applied to a fuel pump is controlled depending on a monitored alcohol concentration contained in a fuel to allow the fuel pump to supply a controlled amount of the fuel which is determined based on the monitored alcohol concentration contained in the fuel.

Abstract: A control apparatus for a fuel injector has a microcomputer which calculates a basic pulse width of pulses to be applied to a fuel injector. When the voltage of a battery which powers a fuel pump and the fuel temperature fall below levels which cause the discharge pressure of the fuel pump to drop below a prescribed pressure, the microcomputer corrects the basic pulse width by lengthening it to compensate for the drop in fuel pressure. Pulses having the corrected pulse width are applied to the fuel injector.

Abstract: A fuel delivery system for internal combustion engines in which an electric-motor fuel pump supplies fuel under pressure to a fuel injector carried by the engine. An engine air intake manifold is likewise carried by the engine and supplied with combustion air. A pressure sensor is responsive to a pressure differential between the fuel injector and air manifold for controlling a pulse-width modulated drive signal applied to the fuel pump motor.

Abstract: The invention is directed to a control circuit for controlling the speed of an electric fuel pump for an internal combustion engine having fuel injection and includes a speed limit-value comparator for controlling the speed or delivery rate of the fuel pump to a value below the minimum speed or delivery rate for a speed of the engine above a specific predetermined limit speed which is impermissibly high. The minimum speed or minimum delivery rate is then the delivery rate which is required for at least building up the system pressure in the fuel injection system.

Abstract: The pump of the invention has application as a fuel pump for delivering fuel over a range of flow rates to an internal combustion engine. The pump may however be employed in many other applications, such as chemical applications, medical applications and hydraulic applications for example, particularyly where fine control of the fluid flow rate and a fast response from the pump to flow rate change requirements is necessary.

Abstract: There is disclosed an electronic dual-fuel injection system for an internal combustion engine having a cylinder block with driving cylinders. The system has an intake manifold which is connected to the driving cylinders to feed fuel mixtures to the cylinders and an air supply assembly including a shuttle-valve body connected to the manifold for feeding air into it. A high grade fuel supply assembly, which includes an injector mounted on the output section of the air supply assembly, serves for feeding high grade fuel to the manifold. A similar but low grade fuel assembly, which includes a plurality of injectors each of which is mounted on the manifold, serves for feeding low grade fuel to one of the driving cylinders. The injection system also includes a computer, connected to the two fuel supply assemblies, and temperature sensors connected to the computer and to the cylinder block to measure its temperature.