Abstract: A fuel pump with an inlet through which fuel is drawn from a fuel tank and an outlet through which fuel is discharged under pressure to an operating engine of a vehicle has an inlet throttle valve actuated by the pressure of the pump outlet fuel to at least partially restrict the flow of fuel through the inlet of the fuel pump and thereby reduce the flow rate of fuel discharged from the fuel pump when the fuel pump is delivering more fuel than is being consumed by the engine. The valve is preferably received within an inlet module between the fuel tank inlet and the fuel pump inlet. Preferably, the valve is slidably received in a passage in the module and actuated by a diaphragm received in the passage and displaceable by the pressure of the pump outlet fuel in response to engine fuel demand.

Abstract: A fuel supply system for an engine powering an outboard motor is disclosed. The fuel supply system includes a first pump for delivering fuel from a fuel supply to a fuel reservoir located at the motor. Another pump delivers fuel from the reservoir to a charge former. The rate of fuel delivery into the reservoir is regulated by a valve based upon the level of the fuel within the reservoir. A flow rate sensor is provided for sensing the fuel flow rate into the reservoir. The fuel system is arranged to limit a change in sensed fuel flow rate when a position of the motor is changed, such as when the motor is trimmed.

Abstract: Electric current to a fuel pump in an engine fuel supply system is controlled so that a deviation in the number of pump rotations between a predetermined reference number of rotations of the fuel pump and an actual number of rotations thereof is within a predetermined range. When the deviation exceeds a predetermined range, it is determined that the fuel supply system is abnormal and at this time the operation of the fuel pump is limited. In this manner, the electric power consumed by the fuel pump is reduced because excess fuel is not circulated in the fuel supply system, thus accomplishing an improved reliability.

Abstract: This invention includes selecting a desired pressure for fuel injection in an internal combustion engine. The selection improves control of fuel injection by keeping the fuel in the fuel rail in a liquid state and by keeping the fuel injectors in an operating region where fuel injector fuel flow is less sensitive to changes in fuel injector pulse width.

Abstract: In a fuel pump control, until a rotational speed of an electrically-driven fuel pump rises to a predetermined speed, an electric current supplied to the fuel pump at an engine starting is increased higher than that normally supplied after engine starting thereby causing fast build-up of the fuel pressure. After the fuel pump reaches the predetermined speed, the electric current is decreased to a normal after-start current thereby suppressing a fuel pressure overshoot and resulting overrich mixture. Alternatively, a fuel pump speed is raised by the voltage control first at an engine starting operation, while switching the voltage control to the current control intermittently to detect the voltage applied to the fuel pump. When the detected voltage reaches a first predetermined voltage, the fuel pump speed is controlled exclusively by the current control.

Abstract: An electrically powered fuel pump in an electronic returnless fuel delivery system for an internal combustion engine is controlled during transient engine operating conditions. A controller senses an operating parameter to infer whether a transient engine operating condition exists. Then, the controller generates an estimate of a fuel pump correction signal based on this inference. The correction signal is generally sufficient to cause the fuel pump to respond to the transient condition, by supplying a generally correct amount of fuel, prior to the engine requiring a change in fuel quantity.

Abstract: A pressure control valve includes a downstream pressure control valve disposed between a fuel pipe and a fuel rail. An opening-closing valve can be integrally formed with the downstream pressure control valve. A relief valve can be disposed to bypass the downstream pressure control valve. The downstream pressure control valve opens or closes the fuel passage leading to the fuel rail so that fuel pressure in the fuel rail is maintained at a predetermined value. When the engine is stopped, the fuel passage is closed to decrease leakage of fuel from the fuel injector. When the fuel pump is again operated, the by-pass relief valve is opened by the pressure of fuel in the fuel pipe. Thus, fuel is supplied from an upstream side to a downstream side and fuel pressure in the fuel rail is increased rapidly for engine re-start.

Abstract: The invention is directed to a method for detecting and documenting exhaust-gas relevant malfunctions of a vehicle having an internal combustion engine. The method includes the steps of evaluating the operating state of at least one component of the internal combustion engine in a circuit arrangement to delimit faults, which are caused by improper operation of the vehicle, relative to faults based on defects of the vehicle system; and, outputting a fault announcement and storing the fault announcement in a fault memory in dependence upon the operating state of the component.

Abstract: An fuel supplying apparatus for supplying a fuel to an internal combustion engine. The engine has a plurality of injectors for injecting fuel to the engine, a pump for supplying fuel from a fuel tank to the injectors and a fuel vapor treating device that collects fuel vapor generated in a fuel tank and treats the vapor without releasing it into the atmosphere. An electronic control unit (ECU) controls the injectors for adjusting an opening time period of the injectors depending on the running condition of the engine to control the amount of fuel to be injected from the injectors. The ECU also controls the pump for adjusting the amount of fuel to be discharged from the pump depending an the running condition of the engine to control the pressure of the fuel to be pumped to the injectors. The ECU reduces the opening time period of the injectors to reduce the amount of fuel to be injected from the injectors when the fuel vapor is supplied to the engine by the treating device.

Abstract: In a fuel supply system employing a returnless fuel pipe arrangement, a relief valve is provided at a discharge side of a fuel pump. The relief valve is opened when fuel pressure in the fuel pipe arrangement becomes no less than a system protective pressure, so as to relieve the fuel pressure to protect the system. The relief valve is also arranged to be open when the fuel pressure in the fuel pipe arrangement becomes higher than a target fuel pressure by a predetermined value or when the fuel cut is performed. Thus, the fuel pressure in the fuel pipe arrangement is lowered. Thereafter, when the fuel pressure in the fuel pipe arrangement is lowered to a pressure near the target fuel pressure, the relief valve is arranged to be closed so that the fuel pressure in the fuel pipe arrangement is held substantially at the target fuel pressure.

Abstract: A fuel pump injector for a reciprocating engine having a piston and combustion chamber. The injector comprises a housing having a driving piston slidably received therein. The driving piston is responsive to the pressure in the combustion chamber. A driving cylinder of fuel interfaces with the driving piston and holds the driving piston in place by static pressure. A second smaller diameter driven cylinder of fuel is responsive to the pressure of the driving cylinder. The driving piston statically pressurizes the driving cylinder during the engine's compression stroke. A valve releases the pressure from the driving cylinder to effect fuel injection by transferring the force on the driving piston onto the smaller diameter driven cylinder which injects the atomized fuel into the combustion chamber where it ignites.

Abstract: A high-pressure fuel injection system which has a fuel injection unit including an injector, a fuel pump for supplying a high-pressure fuel to the fuel injection unit, a motor for driving the fuel pump, a PID controller for controlling the operation of the motor, a device for measuring an actual fuel pressure in the fuel injection unit, a device for calculating a deviation of the actual fuel pressure from a predetermined desired fuel pressure and for inputting the deviation to the PID controller as an actuating signal, and a device for calculating a desired fuel injection quantity per injection from input signals indicating an engine speed, an accelerator opening, etc. A manipulated variable which is given as an output from the PID controller is supplied to the motor as an input to control the motor.

Abstract: A fuel supply system for an internal combustion engine in which an electrical fuel pump pumps fuel from a fuel tank to a fuel distributor and a pressure switch is connected to respond to the pressure of the fuel. The pressure switch is electrically connected to connect and disconnect electrical power supply to the fuel pump as a function of lower and upper threshold values of pressure of the pumped fuel. The pressure switch contain a storage chamber which stores fuel when the fuel pump is operative andwhen the pump is disconnected, the storage chamber supplies the stored fuel to the full distributor with no back flow to the fuel tank. A pressure reducing regulator is located between the pressure switch and the fuel distributor to reduce the pressure of the fuel supplied to the distributor to a value lower than the pressure of the fuel at the pressure switch.

Abstract: A dual speed fuel delivery system for an internal combustion engine in an automotive vehicle includes a fuel pump, a dropping resistor connected to the fuel pump for reducing the voltage required to drive the fuel pump, and a controller for determining an optimum transition point between one of a relatively high and low speed fuel pump operation so that a controlled amount of fuel is delivered to the engine. The controller calculates fuel pressure increase across the fuel pump, determines the minimum fuel pump voltage necessary to drive the fuel pump such that a predetermined amount of fuel is supplied to the engine and determines the current draw of the fuel pump. The controller then calculates the voltage drop across the dropping resistor and compares the resulting voltage with the minimum fuel pump voltage. The controller then selectively by-passes the dropping resistor based on this comparison.

Abstract: An improved fuel injection system for use with an internal combustion eng mounted in a vehicle. The fuel system has fuel, a fuel pump, a throttle position sensor for sensing the power requested, and an engine control unit. The improvement comprises a fuel pump control circuit using three distinct duty cycle modulator circuits to control fuel pump speed. One duty circuit is used on startup to bring the system to full operating pressure, a second duty circuit provides modulated pulses to the fuel pump to operate the fuel pump at the level set by the throttle position sensor and a third duty circuit operates the fuel pump at idle the third duty circuit maintaining the fuel flow at a level which prevents vapor lock and being also adapted to operate the fuel pump at the reduced level in the event of throttle position sensor failure.

Abstract: Throttle valve opening and engine rotational speed are detected to estimate intake air pressure. Fuel consumption Q is estimated from the estimated intake air pressure. Fuel pump drive voltage is calculated from estimated intake air pressure and estimated fuel consumption through a data map. This map is set in advance from data measured experimentally. By thus driving the fuel pump, it can be controlled at an earlier (i.e., advanced) relative time by taking the response time delay of the control system and the fuel pump into consideration.

Abstract: In a fuel supply system for a vehicle, provided with a fuel tank having a bottom wall having an upward convex portion dividing an interior space of the fuel tank into a first chamber and a second chamber, a discharge rate of an electric fuel pump is controlled properly to reduce power consumption and fuel consumption. A fuel level monitoring means compares an output D.sub.m of a fuel meter unit 13 representing a level of fuel in the fuel tank with a set threshold fuel level L.sub.j, i.e., a minimum fuel level that requires the operation of a jet pump which pumps fuel from the second chamber into the first chamber. A power supply control means controls power supply to the fuel pump to supply power necessary for driving the fuel pump for operation at a discharge rate equal to the sum of the fuel consumption of the engine and a minimum required flow rate necessary for maintaining the performance of the fuel supply system when D.sub.m .gtoreq.L.sub.j or for operation at a maximum discharge rate when D.sub.

Abstract: A fuel delivery system and method for providing fuel to a fuel injected engine using an engine control unit (ECU) to determine engine fuel demand and adjust fuel pump operation accordingly to supply at least as much fuel as demanded by the engine. The ECU determines a fuel pump control signal based upon fuel demand and applies the signal to a fuel pump driver that controllably drives the pump in response to the control signal. The ECU determines fuel demand by monitoring engine operation and calculates a control signal that controls the duration of time the fuel injector stays open during an upcoming intake stroke of engine operation. The pump control signal is proportional to engine fuel demand multiplied by a constant that ensures more fuel will be available for delivery to the injector than demanded by the engine. Engine fuel demand is proportional to the duration of time the injector will stay open multiplied by the engine speed.

Abstract: A bypass pressure control unit for use in bypass relation to a fuel delivery line of a pump operated fuel delivery system for an internal combustion engine. The unit includes a housing that encloses a flexible diaphragm valve for defining with the housing a first bypass outlet chamber and a second fuel inlet chamber. The housing has a fuel inlet for communicating the second chamber with the fuel delivery line. The regulating valve is a flexible diaphragm membrane biased by a spring into direct engagement with a relatively large diameter valve seat formed in the housing so that the diaphragm itself acts as a valve member. The diaphragm is movable against spring force by a given pressure of fuel in the second chamber to disengage the diaphragm from the valve seat to thereby communicate the second chamber with the bypass fuel outlet. In one embodiment, the fuel outlet is formed in the housing and has a restricted orifice downstream of the valve seat.

Abstract: A fuel supply apparatus includes a flow control valve, a housing, a movable portion, a compression coil spring and a coil constructed integrally with a fuel pump (or separately from the fuel pump). The movable portion may be made of magnetic material and attracted to the fuel downstream side against the spring force of the compression coil spring by an electromagnetic attracting force generated by an electric current supplied to the coil. A fuel drain opening can be created by aligning a first communication passage to release an excess part of the fuel passing through fuel passages back to the fuel tank through the drain passage in accordance with an engine operation condition.

Abstract: A fuel supply system for an engine having no fuel return pipe is disclosed. In steps target fuel is set according to an engine operating state. Thereafter, a target current value to be supplied to the motor of a fuel pump according to the target fuel pressure is obtained. In the succeeding step, an actual motor current is detected and, then, the target current value and the detcted current are compared. Thereafter, the supply current is controlled by feedback based upon the difference obtained by comparison between the target current value and the detected current value to eliminate the difference.

Abstract: A fuel delivery system for delivering fuel from a fuel tank to an internal combustion engine includes a fuel pump disposed within the tank and an accumulator communicating between the fuel pump and the engine for storing a volume of fuel under pressure. The system also includes a fuel pump control means for controlling the output of fuel flow from the fuel pump. The control means selectively causes the fuel pump output flow to either supply fuel to both the engine and the accumulator or bypass fuel at a lower pressure while fuel is supplied by the accumulator alone, thereby reducing the average power demand of the pump.

Abstract: In a fuel supply system of an internal combustion engine, an actual fuel pressure Pf is measured by a differential pressure sensor and the actual fuel pressure Pf is averaged in a different degree to determine two kinds of values Pfs and Pft. The value Pfs is used to control the fuel pressure, while the value Pft is used to correct a pulse width. Then, a correction value Vfpci is determined according to the load applied to the engine and used in a feedback control to adjust a fuel discharge pressure of a fuel pump.

Abstract: A fuel cut-off operation is delayed until a predetermined delay time period elapses after a fuel cut-off condition is satisfied. During the delay period, the voltage for driving a fuel pump is gradually dropped to decrease the rotation speed of the fuel pump gradually. Thus, the discharge pressure of the fuel pump is low and hence the rise of a fuel pressure immediately after the fuel cut-off operation starts can be prevented. After the fuel cut-off condition, updating of a fuel pressure feedback correction amount is prohibited until the fuel cut-off operation terminates. In this manner, a feedback control immediately after the fuel cut-off operation terminates is executed by using the feedback correction amount used immediately before the fuel cut-off condition to prevent the drop of the fuel pressure immediately after the fuel cut-off operation terminates. Thus, the fuel pressure can be maintained at a target fuel pressure.

Abstract: A fuel injection system for an engine having a combustion chamber, the injection system having at least one fuel injector with a hydraulically operated actuator for amplifying the pressure of fuel injected from the injector into the combustion chamber, the hydraulic actuator communicating with a hydraulic pulse pump having a slide piston displaced by the pressure of compression and combustion gases within the combustion chamber, the fuel pressure having an amplified pressure profile paralleling the developed pressure profile of gases compressed and combusted in the combustion chamber.

Abstract: In one embodiment of the present invention, a "returnless" fuel system for a motor vehicle is disclosed. A "series-pass" fuel pressure regulator in the system provides fuel of a regulated pressure to a fuel rail comprising at least one fuel injector. A "bypass" fuel pressure regulator provides fuel with a regulated pressure to the series pass regulator. An in-line fuel filter is located downstream from the bypass regulator, such that only the fuel which reaches the series-pass regulator is filtered. A check valve is located downstream from the bypass regulator as well, to prevent fuel pressure bleed-down through the fuel pump and the bypass regulator. A pressure relief valve is coupled to allow fuel with a pressure above a predetermined value to flow around the check valve.

Abstract: A fuel delivery system for an internal combustion engine that includes an electric-motor fuel pump and an electronic control circuit for applying electrical power to the pump motor from a source of d.c. potential. The electronic control circuit is responsive to voltage level at the source of d.c. potential for automatically boosting electrical power applied to the pump motor when voltage available at the source decreases to a preselected level. In the preferred embodiments, the pump motor is a d.c. motor, and the electronic control circuit takes the form of a d.c.-to-d.c. convertor having a transformer and a rectifier circuit coupling the transformer to the motor. Power switches apply alternating current to the transformer when voltage available at the d.c. power source is inadequate, thereby increasing or boosting power applied to the motor through the rectifier circuit.

Abstract: According to the present invention, a fuel supply apparatus includes a fuel pump, a delivery pipe to distribute the fuel to each injector of the engine by receiving fuel supply by the fuel pump, a pressure sensor to detect the fuel pressure supplied to the delivery pipe, and a check valve disposed in the fuel discharge pipe of the fuel pump to prevent counterflow of the fuel from the delivery pipe. The amount of fuel discharged from the fuel pump is controlled to maintain the fuel pressure in the delivery pipe at a set value during fuel injection. At the stop of the engine, the amount of fuel discharged from the fuel pump is substantially reduced to zero, and the pressure of the fuel from the fuel pump is gradually reduced. After the pressure of the fuel discharged from the fuel pump reaches a predetermined value, the fuel pump stops. In this way the internal pressure of the delivery pipe is prevented from excessively rising without exterior parts such as a relief valve disposed outside of the fuel pump.

Abstract: A fuel pump apparatus disposed within a fuel tank which may be employed in automotive vehicles is disclosed. The fuel pump apparatus includes a fuel pump, a filter, and a conductive member. The fuel pump is disposed within a conductive pump housing. The filter includes a filter element and a conductive filter casing. The filter element removes particles contained in fuel which is discharged from the fuel pump and returned to the fuel tank. The conductive member electrically connects between the pump housing and the filter casing for dissipating electrostatic charges generated by the friction between the filter element and the fuel passing through the filter element.

Abstract: A fuel injection system includes a vane-type fuel pump. The fuel pump has a first bypass passage with a first pressure relief valve for relieving pressurized fuel from a discharge passage downstream of a check valve to the discharge passage upstream of the check valve so that excess pressure in the discharge passage downstream of the check valve can be relieved to the discharge pressure upstream of the check valve. Therefore, fuel leakage through a fuel injection valve can be prevented for avoiding possibility of formation of overrich mixture even upon hot start condition.

Abstract: A combination check and vent valve assembly for an automotive engine fuel system. The valve assembly has a fuel passage through a housing with an inlet communicating with a fuel pump outlet and an outlet to supply fuel to the engine. A check valve is disposed within the fuel passage which is normally closed when the fuel pump is not operating, and will open when the inlet fuel pressure exceeds the outlet fuel pressure. A normally closed vent valve is disposed within the fuel passage upstream of the check valve and serves as a moveable seat for the check valve, which will open when the valve assembly outlet fuel pressure is greater by a predetermined value than the fuel pump outlet pressure to bleed fuel through the passage and to the pump to reduce the outlet fuel pressure to a predetermined minimum pressure.

Abstract: A liquid propane fuel storage and delivery system for a vehicle engine with a fluid handling component module removably top-mounted on an appropriate vehicle-mounted pressurized liquid propane fuel storage tank.

Abstract: A valve in a fuel pressure regulator prevents liquid fuel from being emitted exteriorly of the regulator housing and onto heated engine components. In the preferred embodiment, the valve allows gaseous flow into a chamber of the regulator when the pressure within the chamber is lower than the pressure of gases exterior of the regulator but prevents gaseous flow from within the chamber to the exterior of the housing. In other embodiment an air-bleed passage is provided in the valve to allow gaseous flow from within the chamber to the exterior of the regulator.

Abstract: In a fuel supply system for an internal combustion engine, significant parameters such as fuel pressure and fuel flow rate are determined continuously from measured variables with the aid of an observer. These variables which have been determined are used to achieve fuel delivery performed with regard to a requirement, the control operations being carried out as a function of requirements of the internal combustion engine by the control unit itself.

Abstract: An engine control system that is configured to be attached to the intake port or intake manifold of a reciprocating engine. The system can be designed to allow installation as original equipment or as a retrofit unit. In either case, the system provides the engine with a dual ignition and electronically controlled fuel-injection. The system includes a master control unit (MCU) that utilizes a firmware operated microprocessor. The MCU is connected to a plurality of sensors that sense critical system parameters that determine the engine settings. All system parameters are user-controlled by three system command switches that are located on a control display unit (CDU). The CDU is attached to the MCU by an electrical cable and is positioned on the vehicle to provide easy accessibility.

Abstract: A single fuel pump for a fuel delivery system supplies fuel from the fuel tank to a reservoir and also supplies fuel from the reservoir to the engine. The fuel pump has a single impeller having outer vanes and inner vanes radially inward from the outer vanes. The vanes are aligned with outer and inner channels in the pump housing, respectively, so that fuel may be pumped from the fuel tank into the reservoir. Fuel from the reservoir is then pumped to the engine.

Abstract: A fuel supplying apparatus controls fuel pressure according to engine operating conditions to prevent blow-through of injected fuel into the exhaust system and hyper-vaporization of fuel. When the engine is being started and the fuel temperature is high, or when the engine has just started and the fuel temperature is high, a target fuel pressure is determined according to the fuel temperature. When a predetermined time has elapsed following the starting of the engine, or when the fuel temperature is not high (even if the predetermined time has not elapsed), it is determined whether fuel vapor is being purged from a canister into an intake pipe. The canister traps fuel vapor from a fuel tank. If the fuel purging is being performed, the apparatus determines whether the current engine operation is in a low-load region. If the fuel purging is being performed and the engine operation is in the low-load region, the apparatus computes a target fuel pressure according to the fuel purging conditions.

Abstract: An assembly for feeding fuel from a supply tank to an internal combustion engine, with a fuel feed pump which is driven in rotation by an electric drive motor arranged together with the feed pump in a common housing. For the pump-side axial mounting of the rotor of the drive motor, there is provided, between the rotor and an intermediate housing of the feed pump, a hydrodynamic bearing which is formed by recesses in the end faces of the rotor and/or intermediate housing, these end faces being located opposite and essentially parallel to one another so as to form an annular gap.

Abstract: A fuel delivery system is disclosed in which fuel pressure at a fuel rail is controlled by controlling electrical power applied to an electric fuel pump. The fuel pressure is controlled to maintain the minimum value required to meet two constraints. The first constraint is the quantity of desired fuel to be delivered by the injectors at wide-open throttle as a function of engine speed. The second constraint is to provide enough pressure to meet fuel requirements as the available fuel injector on-time decreases with increasing engine speed.

Abstract: A high pressure fuel system includes a combination bypass and safety pressure release valve across the high pressure fuel pump. The combination valve allows the feed pump to directly provide fuel to the system before the high pressure pump reaches full output pressure. The valve also releases overpressure in the system when the high pressure pump is deadheaded. The combination valve includes a check ball which allows fuel to flow from its input to its output when the pressure is greater at its input than at its output.

Abstract: A fuel supply system for an engine comprises a fuel pump for supplying fuel to fuel injectors, a pump controller which increases the fuel delivery flow rate from the fuel pump during hot restarting or high load running of the engine and a pressure regulator disposed in a fuel supply passage between the fuel pump and the injectors for adjusting the fuel supply pressure at which fuel is supplied to the injectors. The pressure regulator adjusts the fuel supply pressure according to an excess fuel flow rate of fuel returned to the fuel tank from the pressure regulator to a low-pressure side control pressure region over a first excess fuel flow rate range and to a high-pressure side control pressure region over a second excess fuel flow rate range.

Abstract: In a pump control circuit, if a battery voltage declines to a voltage level lower than that required to insure a constant voltage, a low-voltage detection circuit outputs a low voltage detection signal. In the case of the decline in the battery voltage, an NOR circuit outputs the conversion signal from an internal logic section, and a pump control signal bypassing the internal logic section, giving priority to the latter signal. A motor drive circuit turns FET ON and OFF in accordance with the output signal of the NOR circuit. According to ON/OFF of the FET, the intermittent control of the current from the battery to the pump drive motor is performed.

Abstract: A fuel injection system for engines and, in particular, internal combustion engines used on marine vessels, is disclosed including a fuel injection system having a supply port for receiving fuel at a rate in excess of the controlled rate, an injection port for discharging fuel into the engine at the controlled rate and a return port for conducting fuel in excess of that discharged from the injection port from the injection system. The fuel injection system also includes a pump having an inlet directly connected by a first conduit to a return port and an outlet directly connected by a second conduit to the supply port, a third conduit system for conducting fuel from the supply tank into the first conduit at a first location between the return port and the inlet, and a pressure regulating system for maintaining the pressure at the return port at a predetermined substantially constant super-atmospheric pressure.

Abstract: An improved fuel injection control apparatus, in which a reference pressure is provided to a pressure regulator, for simplifying the fuel supply system by preventing the fuel quantity injected from injection valves into an engine from being influenced by variations in the air intake pressure. A pressure regulating device disposed in a fuel supply pipe between a fuel pump and the fuel injection valve regulates the pressure of fuel supplied from the fuel pump to the fuel injection valve so that the pressure is proportional to the predetermined pressure, without returning fuel from the injection valve to the fuel tank. An intake pressure detecting device detects the pressure in the intake pipe, and a fuel injection quantity correcting device corrects the fuel injection quantity according to deviations of the fuel pressure regulated by the pressure regulating device from a proper value due to the differential pressure between the pre-determined pressure of the pressure regulating means and the intake pressure.

Abstract: A fuel delivery system for an internal combustion engine that includes a fuel pump responsive to application of electrical power for delivering fuel under pressure to the engine. A pressure sensor supplies a pressure signal as a function of fuel pump output pressure. Electrical circuitry is responsive to the pressure signal for applying electrical power to the pump. A temperature sensor is operatively coupled to the circuitry for automatically varying the pump power signal to increase fuel pump output pressure when temperature at the temperature sensor exceeds preselected threshold temperature.

Abstract: A fuel injection device for internal combustion engines has an injection nozzle to which fuel is supplied by means of a pressure device comprising a fuel-accelerating pump and a fuel-retarding device which, when activated, convert the kinetic energy of the accelerated fuel abruptly to a pressure shock wave which causes the fuel to be sprayed through the injection nozzle. According to the invention, an intermittently operated fuel-accelerating pump is used. This pump and the preferably electrically operated retarding device are preferably controlled by a common control device. As a result, the injection device can be operated with very little, optimally utilized energy and can inject fuel in a precisely controllable manner very quickly and when decoupled from the motorized operations.

Abstract: A fuel supply manifold in a returnless fuel system for supplying fuel to an internal combustion engine has a fuel rail with a first end having a first opening and a second end having a second opening. A one piece end plug, which fits into the first opening to provide closure thereof, has a fuel hose connector with a fuel inlet therethrough to pass fuel to the fuel rail and a fuel temperature sensor in close proximity to the fuel inlet. The one piece end plug also has an electrical connector casing for receiving an electrical connector to conduct the fuel temperature signal to a remote location for processing. A flange on the end plug attaches to the fuel rail with a pair of bolts, and a core with O-rings thereon extends from the flange for locating and sealing the end plug to the fuel rail. The second end is capped so that fuel may not flow therethrough.

Abstract: A description is given of a method for filling the fuel supply system in an internal combustion engine, in which the fuel pump is activated by the control unit. If the control unit recognizes, as a function of measured variables, that filling with fuel should take place, it activates the fuel pump in a manner such that a sufficient filling of fuel is already obtained before the internal combustion engine starts. If, on the other hand, the control unit recognizes a normal start, the customary method for controlling the electric fuel pump is executed. The time control of the electric fuel pump is changed over to normal activation also as a function of recognized termination conditions.

Abstract: A fuel pressure regulator for an internal combustion engine fuel delivery system that includes a flexible diaphragm carried within a housing to define first and second chambers on opposed sides of the diaphragm. The first of the housing chambers includes an inlet for connection to a source of fuel under pressure, an outlet for connection to the fuel rail and fuel injectors or other fuel delivery mechanism at the engine, and a valve associated with the inlet and movable responsive to the diaphragm between open and closed positions to control flow of fuel through the first chamber to the engine. A bimetallic element is disposed within the housing coupled to the valve and responsive to temperature of fuel in the housing for positioning the valve in the open position when temperature of fuel in the first chamber reaches a preselected level.

Abstract: Fuel pressure in a deadheaded fuel rail is regulated by an eddy current clutch that forms part of the mechanism that mechanically couples the engine crankshaft with a fuel pump which delivers pressurized fuel to the rail. An electric control that receives several inputs, including engine speed and fuel rail pressure, controls the degree of coupling that is provided by the clutch so that the pressure is regulated even though the engine speed and fuel demand change during normal engine operation.