Abstract: The invention relates to a method for supplying a high-pressure pump (1) in a fuel injection system of an internal combustion engine with fuel, wherein for delivery and for controlling the delivered quantity a delivery pump (3) is used, wherein said delivery pump is arranged in a low-pressure circuit (2) and operated by an electric motor and by means of which, depending on the respective selected engine speed, a certain quantity of fuel is fed to the high-pressure pump (1), in which the fuel is first compressed and then fed to a fuel high-pressure accumulator (4). According to the invention, the fuel pressure on the intake side of the high-pressure pump (1) is controlled by means of a pressure control valve (5), wherein a supply of the high-pressure pump (1) with fuel for lubrication and/or cooling via the low-pressure circuit (2) and the delivery pump (3) is assured when the pressure control valve (5) is in the closed position. The invention further relates to a fuel injection system.

Abstract: Engines and methods execute a high efficiency hybrid cycle, which is implemented in a volume within an engine. The cycle includes isochoric heat addition and over-expansion of the volume within the engine, wherein the volume is reduced in a compression portion of the cycle from a first quantity to a second quantity, the volume is held substantially constant at the second quantity during a heat addition portion of the cycle, and the volume is increased in an expansion portion of the cycle to a third quantity, the third quantity being larger than the first quantity.

Abstract: A high-pressure pump has a metering valve and a valve stopper. The stopper has a regulation portion which an end surface of the valve is brought into contact with. An outer diameter of the regulation portion is equal to an outer diameter of the outer peripheral surface of the valve. A cylindrical sleeve is disposed around the regulation portion. When the end surface of the valve is in contact with the regulation portion, the sleeve covers a tapered surface of the valve.

Abstract: An internal combustion engine has a fuel pressure sensor, the measured value of which represents a fuel pressure in a fuel reservoir of the internal combustion engine. Fuel is metered from the fuel reservoir into a combustion chamber. In a predefined idle operating state (LBZ) of the internal combustion engine, a speed of the internal combustion engine is regulated so as to reach a specific idling speed. During the regulation process, a value of a manipulated variable for metering the fuel is determined, the value being required to reach the specific idling speed. Furthermore, it is concluded that the measured fuel pressure value contains an error (ERR) when the determined required value of the manipulated variable differs from a reference value (REF) predefined for the predefined idle operating state (LBZ) of the internal combustion engine by at least a given amount or factor.

Abstract: A pressure-reducing regulator for CNG fuel includes a high pressure sensor that detects fuel pressure at an inlet, a filter element that filters fuel, an orifice that provides access to a pressure reduction chamber, and a movable pintle located within the orifice, such that a flow rate of fuel through the orifice varies according to a position of the pintle within the orifice. The pressure-reducing regulator further includes a motor that moves the pintle, a low pressure sensor that detects fuel pressure at an outlet and a control unit comprising a processor. The process is configured for reading data from the high pressure sensor, data from the low pressure sensor and vehicle data from an engine, calculating a desired position of the pintle based on the sensor data and the vehicle data, and transmitting a signal to the motor for moving the pintle to the desired position.

Abstract: The fuel supply apparatus optimizes the timing of performing the fuel pressure change indication and the fuel injection timing to suppress the real fuel injection amount from being differentiated from the target fuel injection amount even at the time of the fuel pressure being changed, thereby improving fuel consumption. The ECU judges that the fuel pressure change request is generated (“YES” in Step S11), and calculates the change retarding time t1 (Step S12) when the fuel pressure is at the low pressure side, and the ECU determines that the vehicle is in the warming-up state, or that the fuel is at the high temperature. The ECU sets the change timing to avoid the timing of injecting the fuel from overlapping the changing timing of the fuel pressure with reference to the injection timing of the fuel injection control (Step S13).

Abstract: The present invention relates to a fuel metering device for a fuel injection system for internal combustion engines having a plastic housing. According to the invention, the fuel metering device includes a control valve having a valve piston which is actuated by an actuating device. Furthermore, the plastic housing can be produced by spray-coating.

Abstract: Methods and systems are provided for fuel systems including a gaseous fuel. Fuel rail over-pressure may be addressed by temporarily closing a fuel tank valve of the gaseous fuel and initiating diagnostics routines to determine if a pressure regulator is degraded. If the pressure regulator is degraded, one or more fuel system components may be adjusted to enable fuel rail pressure control.

Abstract: The invention relates to a method for the open-loop control and the closed-loop control of an internal combustion engine (1), the rail pressure (pCR) being controlled in a closed loop mode in the normal operating state and an emergency operation mode being activated once a defective rail pressure sensor (9) is detected, in which emergency operation the rail pressure (pCR) is controlled in an open loop mode. The invention is characterized in that in the emergency operation mode, the rail pressure (pCR) is gradually increased until a passive pressure relief valve (11) is activated which redirects fuel from the rail (6) to the fuel tank (2) when it is open.

Abstract: A fuel pressure varies according to whether a fuel pressure sensor and a high-pressure pump have a malfunction or not. In view of this, a first threshold Perr1 is defined for determining whether the fuel pressure sensor has a malfunction and a second threshold Perr2 is defined for determining whether the high-pressure pump has a malfunction. The second threshold Perr2 is greater than the first threshold Perr1. By comparing a detection value of the fuel pressure sensor with the first and the second threshold, a malfunction in the fuel pressure sensor and a malfunction in the high-pressure pump are distinguished from each other. A first fail-safe control or a second fail-safe control is executed according to a portion having a malfunction.

Abstract: The invention relates to a control and regulation method for an internal combustion engine having a common rail system, wherein a rail pressure is regulated in normal operation in that a first actual rail pressure is determined via a first filter from the rail pressure, an offset is calculated from a target rail pressure and the first actual rail pressure, a variable is calculated via a pressure regulator from the offset and a PWM signal having a first PWM frequency (f1) for activation of a control process is determined in dependence on the variable.

Abstract: Based on a detection signal of a fuel pressure sensor provided in a first fuel injector, an ECU determines whether a fuel pressure in a first fuel injector is increased over a specified amount when a second fuel injector provided with no fuel pressure sensor terminates a fuel injection. When the ECU determines that the fuel pressure in the first fuel injector is increased over a specified amount, it is diagnosed that the second fuel injector does not have a malfunction of continuous injection.

Abstract: A system and method for operating a fuel system that supplies fuel to a plurality of injectors in an internal combustion engine via a first pump and a second pump with a bypass circuit returning fuel from between the first and second pumps to a fuel tank, the pumps connected in series, is provided. The bypass circuit increases its restriction to increase injection pressure during selected conditions.

Abstract: A method for regulating a fuel injection system of an internal combustion engine, wherein the fuel injection system includes a high-pressure pump which is associated with a quantity control valve having a solenoid valve electromagnetically operable by a coil for supplying fuel, the quantity control valve regulating the fuel quantity pumped by the high pressure pump and the coil of the solenoid valve being energized according to a setpoint current value in order to close the valve for supplying fuel to the high-pressure pump; when the solenoid valve closes, the setpoint current value is reduced from a first current setpoint value to a second current setpoint value so that an emission of audible noise generated when the solenoid valve closes during operation of the internal combustion engine is at least partially reduced.

Abstract: The invention relates to a machine tool having working field illumination disposed in a housing, having an illumination mechanism and a transparent element which allows the light from the illumination mechanism to be led out toward the working field. A light beam can be deflected between the illumination mechanism and the transparent element. According to the invention, the transparent element forms a region of the housing.

Abstract: Methods and systems for detecting leakage of a liquid fuel into a gas fuel rail of a dual-fuel system for an internal combustion engine are disclosed. The methods and systems include sending an injection signal from a controller to a fuel injector and subsequently injecting gas fuel and liquid fuel into a cylinder for combustion. A pressure in the gas rail detects the pressure in the gas rail over a pre-determined time period after the injection event. A controller measures pressure fluctuations in the gas rail over a pre-determined time period after the injection event. If the pressure in the gas rail fluctuates by more than the pre-determined amount, the controller is programmed to take at least one mitigating action to prevent or limit damage to the engine.

Abstract: In a method for controlling a fuel injection system (10) of an internal combustion engine, wherein the fuel injection system (10) comprises a manifold (24) and a high-pressure pump (20) and a fuel dosing unit (16) is associated with the high-pressure pump (20), wherein the fuel dosing unit (16) controls the amount of fuel delivered, an amount of fuel required for the operation of the internal combustion engine is determined as a function of a correction factor, which is based on a fuel pressure at the inlet of the high-pressure pump (20) and/or on a vapor pressure of the fuel to be delivered.

Abstract: An electro-valve for discharging a common rail while maintaining a minimum pressure, comprising an electro-magnetic coil inside which is arranged a movable plunger, controlling the displacements of a movable axis engaging a ball valve, said movable plunger being urged in the closing position of the ball valve by a spring housed inside a bearing cap, wherein a bottom wall of the bearing cap surrounds an external surface of the movable plunger, wherein a clearance between the external surface of the plunger and an internal wall of the bearing cap is filled with a film of fuel, the opening movement of the plunger causing the fuel to flow from a room situated on top of the plunger to a bore in which the axis is arranged, wherein a sleeve of a controlled thickness is arranged around the plunger within the clearance to set the thickness of said film of fuel.

Abstract: The disclosure provides a control device of a spark-ignition gasoline engine. When an operating state of an engine body is within a low engine speed range, a controller controls a fuel pressure variable mechanism so that a fuel pressure is higher within a high engine load range compared to a low engine load range, the controller operates, within the high engine load range, a fuel injection valve to perform a fuel injection at least at a timing that is more retarded than an injection timing of a fuel within the low engine load range and is within a retard period from a late stage of a compression stroke to an early stage of an expansion stroke, and the controller operates, within the high engine load range, an ignition plug to ignite at a timing within the retard period and further after the fuel injection.

Abstract: A fuel management system for an engine having a common fuel rail. The fuel management system includes means to regulate air supply and fuel supply. A control unit is provided to determine a maximum allowable fuel mass flow supplied from the fuel rail, based on the air supply and a predetermined air-fuel ratio for the operating parameters of the engine. The control unit calculates an allowable upper limit of rail pressure based on the determined maximum allowable fuel mass flow. The control unit regulates the fuel supply based on the determined allowable upper limit of the rail pressure.

Abstract: To provide a fluid pressure regulation apparatus and a fuel supply apparatus which are compact in arrangement and simple in construction, a pressure regulator includes a housing, a pressure adjustment member constituted by a partition wall forming together with the housing a pressure adjustment member held in communication with a fluid introduction opening and having the pressure adjustment chamber brought into communication with a fluid discharge opening in response to the pressure of fluid in the pressure adjustment chamber. The pressure regulator is capable of adjusting the fluid pressure in the pressure adjustment chamber to a preliminarily set pressure, and has one surface side thereof forming an area of a pressure receiving range receiving the fluid pressure, the area being variably set and the set pressure being varied in response to the area of the pressure receiving range.

Abstract: Methods and systems are provided for varying fuel injection pressure in a gaseous-fueled vehicle. A mechanical pressure regulator may be modified to regulate the pressure of gaseous fuel to varying pressures based on electronic pressure feedback and engine operating conditions. In one example, a regulating pressure in a low pressure chamber of a pressure regulator may be varied by controllably flowing gaseous fuel into or out of a reference chamber of the pressure regulator, and the gaseous fuel exhausted from the reference chamber may be directed to the engine for combustion.

Abstract: A method for the self-learning of the variation of a nominal functioning feature of a high pressure pump in an internal combustion engine, which pump feeds fuel to a common rail and is controlled by a solenoid valve depending on an objective pressure inside the common rail and by using the nominal functioning feature which provides a delivery of fuel; in cut-off conditions of the engine, the method includes determining the value of the pressure leaks due to blow-by in the common rail; measuring the real pressure of the fuel inside the common rail; actuating the high pressure pump by controlling the solenoid valve with a predetermined closing angle; measuring the real pressure of the fuel inside the common rail again; determining a pressure deviation between the real pressure and an expected pressure of the fuel, and correcting the nominal functioning feature according to this deviation.

Abstract: A pressure-regulating valve for regulating the pressure in a high-pressure fuel accumulator of an internal combustion engine, in particular in common-rail injection systems, with a valve piston (3) which is guided in an axially displaceable manner in a bore (1), is acted upon in the opening direction by the compressive force of a spring (2) and, when a magnet coil (4) is energized, undergoes an axial displacement in the direction of a first valve seat (5) counter to the compressive force of the spring (2) and counter to the pressure prevailing in the high-pressure fuel accumulator, wherein the valve piston acts on a valve-sealing element (6) which interacts with the valve seat (5).

Abstract: A valve device for controlling or metering a fluid includes a housing, a flow duct formed in the housing, and a valve body arranged in the flow duct. The valve body has a sealing section which, when the valve device is closed, rests on a sealing seat on the housing. The sealing section and sealing seat together form a sealing region. When the valve device is closed, a decay chamber is defined immediately upstream of the sealing region in the flow duct. The decay chamber is bounded by a baffle wall that is tilted with respect to the normal to the sealing region at an angle of at most 15° in the flow direction to 60° counter to the flow direction.

Abstract: The fuel injection apparatus for the internal combustion engine includes: a fuel injector having a leading end portion that has an internal space in which fuel is accumulated and an injection port for injecting fuel; and an adsorbent disposed in the internal space, the adsorbent being capable of selectively adsorbing an alcohol component in a blended fuel of gasoline and alcohol. In this fuel injection apparatus, it is determined whether or not a fuel pressure is higher than a predetermined low fuel pressure when a request is issued for bringing an internal combustion engine to a stop. If it is determined that the fuel pressure is higher than the low fuel pressure, the fuel pressure is kept at the low fuel pressure for a predetermined period of time before the internal combustion engine is brought to a stop.

Abstract: A fuel-pressure waveform detector has a detect-waveform obtaining unit for obtaining a multi-stage injection pressure waveform by means of a fuel-pressure sensor while performing a multi-stage fuel injection during one combustion cycle. A model waveform memory stores a reference model pressure waveform of when a single fuel injection is performed. A waveform extracting unit extracts a pressure waveform due to the subject fuel injection by subtracting the reference model pressure waveform from the multi-stage injection pressure waveform. A correction unit corrects the reference model pressure waveform in such a manner that its attenuation degree becomes larger as a fuel injection period of the subject fuel injection is longer.

Abstract: A system and method cleans a fuel pump pressure control function valve having (i) an orifice linking a first region (e.g., a high pressure region) and a second region (e.g., a low pressure region) and (ii) a closing member biased to close the orifice when fuel pressure in the first region is below a threshold pressure. Cleaning the valve may include increasing the pressure in the first region to an overpressure condition, thereby causing the closing member to be moved to open the orifice such that a rapid flow of fuel occurs from the first region to the second region. A pressure control function valve can therefore be conveniently cleaned without requiring engine disassembly or adding additional physical elements. The fuel pump pressure control function valve may be part of safety or check valve of a fuel pump.

Abstract: A fuel injection system for an internal combustion engine has a fuel distributor (2), in the interior space (4) of which is formed a high-pressure accumulator, wherein transverse bores (6) open into the interior space (4). The transverse bores (6) are connected by connecting pipes (8a, 8b) to pressure lines (10) for the supply and discharge of fuel. A high-pressure sensor (30) is arranged at the face-side end of the fuel distributor (2), which high-pressure sensor (30) is connected by a measurement bore (30c) to the interior space (4), and a permanent magnet ring is arranged at that face-side end of the interior space (4) which is assigned to the high-pressure sensor (3).

Abstract: A fluid accumulator arrangement suitable for use with a compression ignition internal-combustion engine comprising a first storage volume, a second storage volume, and valve means fluidly connected between the first storage volume and the second storage volume. In one embodiment, the valve means is a three-way control valve wherein, in a first position, the first storage volume communicates with the second storage volume, in a second position the first storage volume is isolated from the second storage volume and, in a third position, one of the first or second storage volumes communicates with a low pressure drain. The arrangement may also include control means to operate the valve means in accordance with predetermined control strategies.

Abstract: A fuel injection system of an internal combustion engine includes a first and a second fuel pump, a leakage-prone volume flow regulating valve arranged in a fuel line between the first and the second fuel pump, and a control unit configured to actuate the first fuel pump as a function of a position of the leakage-prone volume flow regulating valve, such that the leakage-prone volume flow regulating valve serves as the sole actuating element for pressure regulation in the fuel injection system. An associated pressure regulating method is also disclosed.

Abstract: An anomaly in a high-pressure fuel system of an internal combustion engine is diagnosed early on and with high precision, and, further, the anomaly site is identified.

Abstract: The present invention provides a fuel gas supply system of a gas engine capable of supplying to a fuel gas supply unit a fuel gas of constant pressure which fluctuates little. In a fuel gas supply system, a high-pressure tank and a gas injector are connected to each other by a supply passage, and an electromagnetic pressure regulating valve is provided on the supply passage. The electromagnetic pressure regulating valve is configured to regulate the pressure of the gas, flowing through the supply passage, to pressure corresponding to a current supplied to the electromagnetic pressure regulating valve. The gas pressure downstream of the electromagnetic pressure regulating valve is detected by a low-pressure-side pressure sensor. A controller is electrically connected to the electromagnetic pressure regulating valve.

Abstract: To reliably detect, without adding new parts, injection abnormality not only when fuel injection is not performed but also including fuel injection in a state where the injection quantity has fallen abnormally low. In a state where a flow rate control valve is controlled in a closed loop, a pressure control valve is controlled in an open loop and an indicated injection quantity of fuel that should be injected from fuel injection valves arithmetically calculated by predetermined arithmetic processing on the basis of the operating state of an engine exceeds zero, when it has been determined that the difference between a minimum fuel through-flow rate in the flow rate control valve determined by a predetermined map from an engine speed Ne and the indicated injection quantity and a fuel through-flow rate decided in closed loop control of the flow rate control valve is larger than a predetermined threshold value K, it is determined there is injection abnormality.

Abstract: In a method for adapting the performance of a fuel prefeed pump of a motor vehicle which has a common rail injection system and an internal combustion engine, after the ignition is switched on and before the internal combustion engine is started, adaptation values are determined and stored which are assigned to the fuel prefeed pump and describe its individual performance. After the internal combustion engine is started, the stored adaptation values are taken into consideration during the determining of an actuating signal for the prefeed pump.

Abstract: A fuel pressure regulation system for a motor vehicle includes a fuel pressure regulator in communication with an electronic control device (ECU). The regulated pressure of the fuel pressure regulator can be varied by applying electrical signals from the ECU. According to one embodiment, a length of a spring is adjusted to vary the regulated fuel pressure. According to another embodiment, a viscosity of a fluid is adjusted to vary the pressure.

Abstract: A method and apparatus for controlling a fuel pump assembly comprising a plurality of pump elements, each pump element comprising a cam-driven plunger to perform at least one pumping event per engine revolution and a control valve. Each pumping event corresponds to an associated cam lobe of the associated cam. The method comprises, for each pumping event of each pump element, controlling the control valve of said pump element in response to an output control signal derived from at least one previous pumping event. Fuel pressure is measured within a rail volume and compared with a demanded rail pressure value to derive a rail pressure error. A proportional term and an integral term for the rail pressure error are derived and combined to derive the output control signal. Monitoring of the integral term for each pumping event provides a means for identifying and diagnosing a fault condition.

Abstract: A fuel supply apparatus of an internal combustion engine is provided which can discharge air bubbles or air from within fuel supply paths while increasing pressure within a common rail up to a predetermined pressure level before a start of the internal combustion engine, can reduce a period of time of cranking from when an ignition switch is switched on and which can reduce noise that occurs when the air bubbles or air are being discharged. The fuel supply apparatus is provided with a flow rate control valve that adjusts a flow rate of fuel supplied to the common rail and a pressure control valve that reduces the pressure within the common rail.

Abstract: In one embodiment, a common rail fuel system for an engine of a vehicle, such as a locomotive, comprises a higher-pressure fuel sub-system and a lower-pressure fuel sub-system, wherein a pressure limiting valve, is in fluid communication with to the higher-pressure fuel sub-system to relieve excess pressure. In a condition where pressure of the higher-pressure fuel sub-system is below a desired and expected threshold, it is possible that the pressure limiting valve is open. An example method is provided to close the pressure limiting valve and determine if opening of the pressure limiting valve is the cause of the pressure being below the threshold or if a leak is present in the common rail fuel system. In this manner, unnecessary disabling of the engine is avoided and, if a leak is present, the leaking sub-system is identified.

Abstract: A fuel pump for a direct-injection system provided with a common rail comprises a pumping chamber defined in a main body. A piston is mounted in a sliding manner inside the pumping chamber to cyclically vary volume of the pumping chamber. A suction channel is connected to the pumping chamber and regulated by a suction valve. A delivery channel is connected to the pumping chamber and regulated by a delivery valve. A flow-rate-adjustment device is mechanically coupled to the suction valve to keep, when necessary, the suction valve substantially open during pumping of the piston and includes a control rod that is coupled to the suction valve and an electromagnetic actuator that acts on the control rod and has a one-way hydraulic brake that is integral to and substantially slows movement of the control rod.

Abstract: A liquefied petroleum gas (LPG) fuel assembly may include a fuel rail and a flow control mechanism. The fuel rail may have an inlet in communication with a pressurized LPG fuel source, an injection passageway in communication with the inlet and a fuel injector that provides fuel to a combustion chamber of an engine, and an outlet in communication with the fuel injection passageway. The flow control mechanism may be in communication with the outlet of the fuel rail and a LPG fuel tank and may be operable in first and second modes. The second mode may provide a greater flow restriction than the first mode to control a fuel flow from the outlet of the fuel rail to the fuel tank.

Abstract: A fuel pressure regulating system for an internal combustion engine has a pressure accumulator which is used to store fuel under pressure and to feed the combustion chambers of the internal combustion engine by fuel-supplying injectors, a high-pressure pump which supplies a fuel mass flux to the pressure accumulator, a first valve via which the fuel can be guided out of the pressure accumulator, and a second valve for restricting the fuel mass flux. The system is provided with a first control loop having the first valve as an actuator for regulating the pressure in the pressure accumulator, and a second control loop having the second valve as an actuator for regulating the pressure in the pressure accumulator, and the two control loops are embodied as cascade regulators, the first control loop being a master regulator and the second control loop being a follower regulator.

Abstract: A high pressure fuel pump control system for an internal combustion engine includes a fuel injection valve provided in a fuel common rail and a high pressure fuel pump for feeding fuel by pressure to the fuel injection valve. The high pressure fuel pump includes a pressurized chamber, a plunger for pressurizing fuel in the pressurized chamber, a discharge valve provided in a discharge passage, an intake valve provided in an intake passage, and an actuator for operating the intake valve. The control system includes a means for calculating a drive signal for the actuator to make a discharge amount or pressure of the high pressure fuel pump variable. The means reduces pressure in the common rail by opening the discharge valve to return the fuel in the fuel common rail to the pressurized chamber when a requirement for reducing the pressure in the fuel common rail is made.

Abstract: The temperature of the fuel is raised without consuming the fuel in a fuel injection apparatus for an internal combustion engine. The fuel injection apparatus for the internal combustion engine comprises judging means which judges whether or not a fuel cut state, in which supply of fuel to the internal combustion engine is temporarily stopped during deceleration of a vehicle, is given; and discharge means which discharges the fuel by means of a motive power applied from a rotary shaft of the internal combustion engine; the fuel injection apparatus for the internal combustion engine further comprising increasing means which increases work of the discharge means when it is judged by the judging means that the fuel cut state is given as compared with when it is not judged by the judging means that the fuel cut state is given.

Abstract: It is possible to perform a failure diagnosis of a pressure sensor with a simple structure without installing a dedicated circuit for the failure diagnosis. In a common rail type fuel injection control apparatus, a pressure control valve 12 is provided in a fuel return path from a common rail 1, and a rail pressure detected by a pressure sensor 11 can be controlled to match a target rail pressure through drive control of the pressure control valve 12 by an electronic control unit 4. The target rail pressure is calculated based on operational information of an engine 3. In the common rail type fuel injection control apparatus, learning processing is performed, in which a correction coefficient Cv is stored and updated as a learning value to correct energization characteristics of a median product of the pressure control valves 12 that are stored in the electronic control unit 4. At the same time, it is determined whether the learning value of the correction coefficient Cv is within a predetermined range.

Abstract: The fuel supplied apparatus disclosed is capable of optimizing the timing of performing the fuel pressure change indication and the fuel injection timing to suppress the real fuel injection amount from being differentiated from the target fuel injection amount even at the time of the fuel pressure being changed, thereby making it possible to accomplish the improvement of the fuel consumption. The ECU judges whether or not the fuel pressure change request is generated (Step S11). The ECU judges that the fuel pressure change request is generated (“YES” in Step S11), and calculates the change retarding time t1 (Step S12) when the fuel pressure is at the low pressure side, and the ECU determines that the vehicle is in the warming-up state, or that the fuel is at the high temperature. The ECU sets the change timing to avoid the timing of injecting the fuel from overlapping the changing timing of the fuel pressure with reference to the injection timing of the fuel injection control (Step S13).

Abstract: Provided is a fuel supply control device that performs power supply control of a shut-off valve including a first valve body that is disposed at a fuel supply path ranging from a gaseous fuel tank to a regulator and is opened in advance during power supply, and a second valve body that is opened due to a decrease in a differential pressure between upstream and downstream after the first valve body is opened, and fuel injection control. The fuel supply control device includes a control unit that sets a delay time from an initiation time of power supply to the shut-off valve to an initiation time of fuel injection in correspondence with a first fuel pressure upstream of the shut-off valve and a second fuel pressure downstream of the regulator, and initiates fuel injection after the delay time has passed after the initiation of the power supply to the shut-off valve.

Abstract: On aspect according to the present invention includes a fuel supply system including a backflow preventing device provided in a fuel supply path communicating between a fuel pump and a fuel injecting valve device of an engine. The backflow preventing device can prevent backflow of the fuel from the fuel injecting valve device, so that a pressure of the fuel between the backflow preventing device and the fuel injecting valve device can maintained after stopping the fuel pump.

Abstract: By driving a fuel pump suitably to an amount of fuel according to an amount of fuel consumed by an engine and by monitoring an actual motor speed of the fuel pump, F/B control is carried out according to a target motor speed and the actual motor speed of the fuel pump. Meanwhile, by learning and storing a duty value comparable to a deviation between the target and actual motor speeds, duty driving of the fuel pump is corrected to suit an engine condition. It thus becomes possible to provide a fuel pump control apparatus of an engine capable of promoting power saving by suppressing a wasteful energy loss including a current consumption and making an internal circuit of an ECU simpler by enhancing fuel supply accuracy.

Abstract: In a method and a device for the volume flow control of an injection system, a seat valve (3) is used for the volume flow control. For this purpose, the influence of the pressure present upstream of the seat valve (3) is taken into consideration in the volume flow control.