Abstract: A high pressure pump draws fluid from a fluid inlet into a compression chamber through an inlet chamber. The high pressure pump has a fluid chamber that communicates with the fluid inlet via the inlet chamber. The high pressure pump includes a plunger and a cylinder. The plunger draws fluid from the inlet chamber into the compression chamber when the plunger moves in a drawing direction. The plunger is capable of pressurizing fluid in the compression chamber when the plunger moves in a pressurizing direction. The cylinder movably supports the plunger therein. When the plunger moves in the drawing direction, fluid in the inlet chamber is drawn into the compression chamber, so that fluid flows from the fluid chamber into the inlet chamber.

Abstract: Disclosed is a fuel supplying device of an internal combustion engine, comprising a low-pressure circuit, a high-pressure pump coupled to the low-pressure circuit and conveys fuel into a fuel reservoir, a volume flow control valve assigned to the high-pressure pump, an electromechanical pressure regulator connected to the fuel reservoir and the low-pressure circuit and can direct fuel from the fuel reservoir into the low-pressure circuit, a regulating mechanism which generates an actuation signal for the volume flow control valve by a first controller in a first mode which generating an actuation signal for the electromechanical pressure regulator with the aid of a second controller in a second mode. The mode of the fuel supplying mechanism is switched in accordance with a fuel pressure error value resulting from a detected fuel pressure and a predefined fuel pressure. The mode can additionally be switched according to the throughput of the high-pressure pump.

Abstract: In a fuel injection system of an internal combustion engine that includes, but is not limited to injectors (I1-I4), each of which is adapted to deliver a predetermined amount of pressurized fuel to a combustion chamber of a respective cylinder (C1-C4) of the engine, a high-pressure accumulator volume common to the injectors (I1-I4) and arranged to maintain the fuel at high-pressure, a pressure sensor for measuring fuel pressure in the accumulator volume, a metering unit for adjusting the fuel pressure in the accumulator volume as a function of the measured pressure, so as to maintain a predetermined target injection pressure set-point dependent on the engine operating point by returning excess fuel to a fuel tank; and an electronic control unit arranged for controlling fuel injection timing and quantity by operating injectors control valves, the operating pressure is controlled by triggering retarded injections (INJpost) of a predetermined quantity of fuel to the combustion chamber of the cylinders (C1-C4) of

Abstract: In one embodiment, the high-pressure pump (8) for providing a pressurized supply of fuel in an engine furnished with a common rail type fuel injection apparatus is provided with two actuators (88, 89). Of these actuators (88, 89), one (88) is stopped and the operation for providing a pressurized supply of fuel is performed from only the other actuator (89), so that the timing at which the load torque that acts on the crankshaft of the engine becomes a local maximum and the timing at which the load torque that acts on the driveshaft of the high-pressure pump (8) becomes a local minimum are made to coincide with one another.

Abstract: An ECU estimates a variation amount of fuel which is actually suctioned by a fuel pump based on a fuel pressure in a common rail. Even though the fuel pressure in the common rail deviates from a target fuel pressure, when the estimated variation amount of fuel is substantially zero, an energization quantity to a solenoid of a flow control valve is compulsorily reduced.

Abstract: A fuel supply device (30) for an engine (1) pressurizes the fuel drawn up from a fuel tank (31) by the low-pressure fuel pump (32) and stores it in a delivery pipe (34), and injects the fuel stored in the delivery pipe (34) from an injector (35). The fuel supply device (30) includes a return passageway (50) connecting the delivery pipe (34) and the fuel tank (31), and a relief valve (51) that is provided on the return passageway (50) and that is capable of being switched between an open state for connecting the delivery pipe (34) and the fuel tank (31) in communication and a closed state for shutting off the delivery pipe (34) and the fuel tank (31) from each other in communication. An ECU (60) switches the relief valve (51) to the open state and operates the low-pressure fuel pump (32), if a predetermined stop condition for stopping the engine (1) is satisfied.

Abstract: A method and system for controlling an internal combustion engine is provide. The engine has a fuel-supply device, a low-pressure circuit and a high-pressure pump, to which a control valve for a volumetric flow is allocated is provided. Said pump is coupled on the inlet side to the low-pressure circuit and transports fuel to a fuel accumulator. An estimated value of the drive torque of the high-pressure pump is determined in accordance with the fuel pressure in the fuel accumulator. A loss torque is determined in accordance with the estimated value for the drive torque of the high-pressure pump and additional loss-torque fractions, which are dependent on a motor speed and additional operating variables. A target torque is determined in accordance with the loss torque and an actuating signal for controlling an actuator of the internal combustion engine is generated from the target torque.

Abstract: An internal combustion engine includes a cylinder head having a plurality of intake ports; throttle devices including a plurality of respective intake passages equipped with throttle valves therein; a plurality of fuel injection valves for injecting fuel into the corresponding intake passages; a fuel pipe adapted to supply fuel to the fuel injection valves; and a pulsation damper connected to the fuel pipe to damp fuel pressure pulsation. In the engine, a connection pipe coupled to the pulsation damper is formed between a plurality of branch portions with respect a longitudinal direction of the fuel pipe, adapted to deliver fuel from the fuel pipe to the fuel injection valves and the connection pipe is disposed to at least partially overlap the fuel injection valve as viewed from the longitudinal direction of the fuel pipe.

Abstract: A fuel injector for a work machine is disclosed. The fuel injector has nozzle member having at least one orifice and a needle valve element having a tip end. The needle valve element is axially movable to selectively allow and block fuel flow through the at least one orifice with the tip end. The fuel injector also has at least one supply passageway in communication with the tip end of the needle valve and a variable restrictive device disposed within the at least one supply passageway.

Abstract: The invention relates to a fuel injection system for a multi-cylinder internal combustion engine having a first high-pressure accumulator and having a second high-pressure accumulator. The fuel injection system also has a high-pressure pump, wherein the first and the second high-pressure accumulators have a number of ports for injector supply lines corresponding to the number of cylinders of the internal combustion engine. A damping volume for damping pressure pulsations between the high-pressure accumulators and the high-pressure pump is integrated into one of the high-pressure accumulators.

Abstract: A fuel injector for an internal combustion engine, the fuel injector comprising an injector body, a fuel supply passage defined in the injector body, the fuel supply passage containing fuel under high pressure in use of the injector, a pressure sensor for measuring the pressure of fuel in the passage in use, wherein the pressure sensor is situated within the injector body and is separated from fuel in the passage in use, and a method of fuel injection, comprising constructing an hydraulic behaviour profile by fuel pressure measurement, using the hydraulic behaviour profile to predict fuel pressure that will prevail in a fuel injector during an injection event, and supplying a control signal to the fuel injector to control the amount of fuel injected during the injection event in accordance with the predicted fuel pressure. By predicting the fuel pressure that will prevail during an injection event, the fuel delivered during the injection event can be accurately controlled.

Abstract: A fuel rail assembly of an internal combustion engine includes an axially extending non-round fuel conduit and at least one axially extending stiffening feature integral with said conduit. Integration of the stiffening features in the conduit enables reduction or elimination of the objectionable frequency noise radiated by the fuel rail assembly. By aligning the stiffening features axially relative to the conduit, panels having a relatively small surface area are formed and, thus, the noise radiating surface area is significantly reduced. The axial orientation of the added stiffening features allows the length of the stiffening features to be relatively large, which increases the stiffening effects to provide increased resistance to flexing, thus, reducing the noise radiated by the fuel system of the internal combustion engine.

Abstract: A fuel injection system having a high-pressure accumulator, in which fuel may be stored at high pressure, at least one fuel injector via which the fuel located in the high-pressure accumulator may be injected into the combustion chamber of an internal combustion engine being connectable to the high-pressure accumulator. A high-pressure pump draws in fuel out of a leak fuel area, compresses it, and supplies it to the high-pressure accumulator, so that a high fuel pressure is built up therein during operation of the high-pressure pump. A return line having a regulating valve is implemented between the leak fuel area and the high-pressure accumulator, the regulating valve allowing a fuel flow from the leak fuel area into the high-pressure accumulator when the high-pressure pump is shut down.

Abstract: The invention relates to a fuel injection system for internal combustion engines, having a high-pressure accumulator which has a cavity under system pressure. Provided to the high-pressure accumulator is a pressure control valve that can be actuated electromagnetically. The cavity can be connected by the latter to a low-pressure side of the high-pressure accumulator. Arranged between the cavity and the low-pressure side of the high-pressure accumulator is a check valve which enables the high-pressure accumulator to be filled from the low-pressure side to the system pressure side.

Abstract: There is disclosed a fuel property detector for detecting a property of fuel injected by a fuel injector into a cylinder of an internal combustion engine. The fuel property detector includes an injection commander, a change detector, and a fuel property determiner. The injection commander commands the fuel injector to perform a fuel injection for fuel property detection into the cylinder of the engine. The change detector detects a change in the rotational speed of the engine which is caused by the fuel injection for fuel property detection. The fuel property determiner determines the property of the fuel based on the change in the rotational speed of the engine detected by the change detector.

Abstract: A method for operating an internal combustion engine having a fuel pump with a drive shaft is provided, the fuel pump conveying fuel into at least one fuel-collection line, the fuel being subsequently conveyed to at least one combustion chamber via at least one fuel-injection device. In the method, a quantity of the fuel conveyed by the fuel pump into the fuel-collection line is set by means of a valve device. The valve device is configured to selectively connect a discharge side of the fuel pump to a low-pressure region of the fuel pump (during deactivation phase), and selectively disconnect the discharge side from the low-pressure region (during supply phase). In supplying the quantity of fuel, a supply rate, defined as the number of supply phases of the fuel pump per rotation of the drive shaft, is determined as a function of at least one operating parameter of the internal combustion engine.

Abstract: An economical method for controlling a lift pump operating as part of a direct injection fuel system is described. According to the method, the lift pump is operated at efficient operating conditions and then stopped until additional fuel is requested.

Abstract: A fuel system has a source of fuel coupled to a plurality of fuel injectors via a fuel rail. The system is operable to determining a critical on-time for a selected one of the injectors by disabling fuel flow from the source of fuel to the fuel rail, periodically sampling fuel rail pressure, activating the selected injector for an on-time duration while inhibiting injection by remaining ones of the injectors, determining from the fuel rail pressure samples a pressure drop resulting from activation of the selected injector for the on-time duration, processing the pressure drop to determine whether or not the selected injector injected fuel, and repeatedly modifying the on-time duration followed by executing the sampling, activating, determining and processing steps until a critical on-time is determined that corresponds to a minimum on-time duration to which the selected fuel injector is responsive to inject a discernable amount of fuel.

Abstract: A fuel supply method and circuit including at least one flow-rate regulating valve is provided at a return pipe for returning excess return fuel from a combustion chamber side. During the combustion operation, the fuel from the supply pipe is supplied to a fuel injection nozzle with the return pipe closed or restricted to a predetermined opening degree and the back pressure of the return pipe raised by at least one flow-rate regulating valve. The fuel is supplied to the fuel injection nozzle as being pressurized by the return back pressure, so that the fuel injection nozzle supplies to the combustion chamber the fuel that has been heated to a high-temperature. The return fuel is circulated from the return pipe directly through the supply pipe, and mixed in a sub-tank with low-temperature fuel from a fuel tank. The mixed fuel is supplied to the fuel injection nozzle.

Abstract: An injected fuel pressure boosting device provided with a large diameter piston, a medium diameter piston, and a small diameter piston. A high pressure chamber filled at high pressure at all times is formed at the outer end of the medium diameter pistons, while a pressure boosting chamber is formed at the outer end of the small diameter piston. A pressure control chamber is formed on the end face of the large diameter piston on the small diameter piston side. When high pressure fuel is supplied to the pressure control chamber, the large diameter piston moves to the medium diameter piston side, that is, the pressure boosting preparation position. At this time, the leaked fuel outflow port is closed by the end face of the large diameter piston.

Abstract: A fuel supply system for an accumulator fuel injection system designed to inject fuel, as stored in an accumulator, into an internal combustion engine through a fuel injector The fuel supply system includes a feed pump working to pump the fuel out of a fuel tank and a fuel filter disposed between the feed pump and a high-pressure pump working to deliver the fuel to the accumulator. The fuel supply system also includes a return path and a control valve. When the pressure of the fuel between the fuel filter and the flow rate control valve exceeds a first set pressure, the control valve opens the return path to return the fuel from downstream to upstream of the feed pump to keep the pressure of fuel supplied to the flow rate control valve below the first set pressure, thereby controlling the flow rate of the fuel passing through the fuel filter.

Abstract: A fuel supply system for delivering fuel to, for example, a common rail of a diesel engine fuel injection system. The fuel supply system includes a priming pump, a feed pump, a fuel filter disposed downstream of the feed pump, a return path, and a return valve. When the pressure of the fuel between the feed pump and the fuel filter exceeds a first set pressure, the return valve is placed in a first open position to open the return path to return the fuel from downstream to upstream of the feed pump. When the pressure of the fuel, as fed by the priming pump, exceeds a second set pressure, the return valve is placed in a second open position to open the return path to direct the fuel, as fed by the priming pump, to upstream of the fuel filter to prime the fuel filter directly.

Abstract: A control method for an internal combustion engine with at least one pressure accumulator in which fuel is stored under pressure, in order to supply pressurized fuel to at least one injection valve, and at least two high-pressure pumps which are connected to the at least one pressure accumulator in such a way that they can supply fuel to this at least one pressure accumulator either jointly or separately, with, if at least one condition is fulfilled, the high-pressure pumps being operated in a special operating mode in which only one of the high-pressure pumps supplies fuel to the at least one pressure accumulator, and with the high-pressure pumps being otherwise operated in a normal operating mode in which the at least two high-pressure pumps jointly supply fuel to the at least one pressure accumulator.

Abstract: In a method, a computer program and a control unit for operating an internal combustion engine having an injection system, e.g., for a motor vehicle, in the injection system fuel is conveyed into a fuel accumulator by a metering unit and a high-pressure pump. The pressure in the fuel accumulator is recorded and controlled by control of the metering unit with the aid of the control unit. In order to consider also possible manufacturing tolerances of individual metering units in the control of the pressure in the fuel accumulator of such a system, which is already known as such, and thereby make the control more precise, an individual characteristic curve is provided for the actually used metering unit be ascertained and taken into account in the pressure regulation.

Abstract: A fuel injection system for an internal combustion engine comprises a plurality of pumps arranged to supply respective flows of pressurized fuel to a common accumulator volume that supplies the pressurized fuel in turn to a plurality of fuel injectors. An engine control unit controls the flow rate of pressurized fuel into the accumulator volume in response to engine load. The flow rate of pressurized fuel from at least one pump of the plurality is dependent upon engine speed; whereas at least one other pump of the plurality comprises a fuel output control responsive to the engine control unit enabling the flow rate of pressurized fuel from that pump to be varied independently of engine speed. In this way, the engine control unit controls the aggregate flow rate of pressurized fuel from the pumps into the accumulator volume, while controlling only one of the pumps. This reduces the cost of control apparatus and allows greater freedom of pump selection and flow circuit design.

Abstract: A starting system is provided for delivering pressurized fuel to an engine to start the engine without a starter. The starting system includes an accumulator for storing pressurized fuel during engine operation and engine shut-down. During engine start-up, the accumulator delivers the stored pressurized fuel to the engine to start the engine. The accumulator is in fluid communication with a low pressure fuel reservoir and the engine. The accumulator includes an accumulator housing defining an accumulator cavity and including an accumulator piston and spring assembly, which is moveable longitudinally within the accumulator cavity. An electronic control module (ECM) is in electronic control with the starting system and the engine. The ECM is operable to activate the accumulator, forcing pressurized fuel stored within the accumulator into a high-pressure fuel line for injection into the engine, to generate at least one starting combustion event to start the engine without a starter.

Abstract: An economical method for controlling a lift pump operating as part of a direct injection fuel system is described. According to the method, at least two distinct operating modes are provided.

Abstract: In an injector for an accumulator injection system comprising an injector having an injector housing with an injection nozzle and an actuator for operating the injection nozzle arranged in a fuel-filled pressure space of the injector housing wherein the actuator includes a piezoelectric element disposed between an actuator head and an actuator the base with a fuel-tight casing at least partially surrounding the actuator head and the actuator base, the casing is engaged in a sealing fashion by a first annular element with the actuator base and by a second annular element with the actuator head.

Abstract: According to the present invention, a fuel injection apparatus includes a high-pressure passage, a low-pressure passage, an actuator, a first and a second piston, a displacement amplifying chamber, a fuel injection mechanism, and a fuel supplier. The high-pressure passage is configured to be filled with high-pressure fuel. The low-pressure passage is configured to be filled with low-pressure fuel. The first piston is configured to be displaced by the actuator. The displacement amplifying chamber communicates with the low-pressure passage and works to amplify and transmit to the second piston a displacement of the first piston by means of the low-pressure fuel therein. The fuel injection mechanism is configured to inject the high-pressure fuel into a cylinder of an internal combustion engine in response to the displacement of the second piston. The fuel supplier works to supply the high-pressure fuel from the high-pressure passage through pressure reduction directly to the low-pressure passage.

Abstract: A damping assembly for use with a fuel rail. The damping assembly includes a damper configured to be positioned substantially within the fuel rail. The damper includes a wall and defines a longitudinal axis. A portion of the wall is moveable toward the longitudinal axis from a first position to a second position. The damping assembly also includes an insert positioned substantially within the damper and including a body having a surface. The surface is spaced apart from the moveable portion of the wall when the moveable portion is in the first position.

Abstract: The invention relates to a novel energy accumulator for a load step switch for rapid, continuous switching between various winding tappings. Said energy accumulator comprises a lifting carriage and a jumping carriage, which follow the movement of the jumping carriage in a jumping manner. Both of the carriages are guided along three parallel guiding rods. The lifting carriage and the jumping carriage comprise, respectively, three linear roller bearings which respectively surround one of the three guiding rods.

Abstract: A common-rail fuel injection system is equipped with a common-rail, a fuel pump 11, and an injector. The fuel pump has a plurality of fuel pumping systems. A pressure sensor is provided at a fuel inlet of the injector. When the fuel pump supplies fuel to each of the fuel pumping systems, an ECU detects a variation in fuel pressure in a fuel passage between the fuel pump and the injector. Based on the detected fuel pressure variation, the ECU computes a pumping characteristic with respect to each of the fuel pumping systems.

Abstract: A system and method for metering fuel is provided which includes a fuel supply line and a metering valve in fluid connection with the fuel supply line to control a flow of fuel through the fuel supply line. The valve is movable into a closed position to block a primary flow of fuel and create a leakage fuel flow in the fuel supply line downstream of the metering valve. The system also includes a venturi apparatus fluidly coupled to the fuel supply line upstream of the metering valve. The venturi apparatus is further coupled to the fuel supply line downstream of the metering valve to direct the leakage fuel flow out of the fuel supply line.

Abstract: A fuel pressure sensor is provided to each fuel injector respectively and is disposed in a fuel passage between the accumulator and a fuel injection port of the fuel injector in such a manner as to be close to a fuel injection port relative to the accumulator. Output values of a plurality of fuel pressure sensors are acquired, and an average of the output values is computed. The output values are corrected in such a manner as to agree with the average.

Abstract: A controller, in electrical communication with the one or more of the injectors and a high-pressure fuel pump, generates a first signal responsive to which the valve in the injector opens or closes and a second signal responsive to which the high-pressure fuel pump increases or decreases the pressure level in the fuel accumulator. The system may also include one or more sensors for detecting a temperature of air in an air manifold, a pressure within the air manifold and a barometric pressure. The controller is programmed to estimate an in-cylinder gas density using data received from the sensors. The controller accesses a database having data representative of one or predetermined in-cylinder gas densities that are associated with one or more predetermined fuel injection parameters. The controller then generates one or more commands indicative of the fuel injection parameters that are associated with a predetermined in-cylinder gas density.

Abstract: It is an object of the present invention to inhibit production of vapor within fuel when an engine is at a high temperature and to inhibit change of amount of the fuel injected from an injector. A fuel supply apparatus according to the present invention includes vapor production determining means (3) for determining whether or not the vapor of the fuel is producible, and control means (ECU) for operating a passage resistance adjusting means (47) of a pressure adjusting mechanism (40) to cause increase of the pressure of the fuel supplied to an injector (5) insomuch as the production of the vapor is inhibited when the vapor production determining means (3) has determined a vapor producible condition.

Abstract: The invention relates to an internal combustion engine comprising a fuel supplying device. Said fuel supplying device comprises a low-pressure circuit provided with a low-pressure pump and a high-pressure pump that is coupled to the low-pressure circuit on the input side and transports fuel into a fuel accumulator. A fuel transporting flow of the low-pressure pump is corrected according to an actual and a previously pre-determined nominal value of the fuel pressure in the fuel accumulator.

Abstract: A fuel injection controller used for a fuel injection device that pumps high-pressure fuel to an accumulator and distributes the high-pressure fuel accumulated in the accumulator to injectors mounted in respective cylinders of an internal combustion engine calculates an input quantity and an output quantity of the fuel to and from the accumulator and monitors fuel pressure in the accumulator with a pressure sensor attached to the accumulator. The fuel injection controller has a determination device that determines whether there is a deviation between a sensing value Pcob1 of the pressure sensor and a corresponding value assumed from data Qpf applied to balance computation of the fuel input/output quantities and a storage part that stores the corresponding value Pcf2 based on the data Qpf applied to the balance computation and the sensing value Pcob1 of the pressure sensor and that enables subsequent reading out of the stored values.

Abstract: A fuel injection start timing is determined based on the engine revolution or the engine load, and a common rail pressure is detected simultaneous to this fuel injection start timing. The fuel injection duration is then calculated based on the detected value of the common rail pressure. By doing this, it is possible to obtain a fuel injection duration that is suited for the common rail pressure at the actual fuel injection start time, resulting in an appropriate injection amount.

Abstract: In an apparatus, a shift quantity calculating unit tentatively shifts a reference fuel spray characteristic to an obtained actual fuel spray characteristic in a phase direction and in a magnitude offset direction while monitoring a distance between the reference fuel spray characteristic and the obtained actual fuel spray characteristic therebetween. The shift quantity calculating unit calculates a shift quantity between the reference fuel spray characteristic and the obtained actual fuel spray characteristic in the phase direction when the monitored distance is minimized. A phase correcting unit shifts the reference fuel spray characteristic by the calculated shift quantity in the phase direction to thereby correct the reference fuel spray characteristic.

Abstract: In an injection system having a device for metering fuel into an exhaust system of a Diesel engine, and a method for controlling the injection of fuel into the exhaust system, wherein the injection system has a high-pressure pump which feeds fuel to an accumulator under high pressure and injectors which inject fuel from the accumulator into the combustion chambers of the internal combustion engine, a fuel spray nozzle arranged in the exhaust system is in communication with the injection system via a fuel metering unit including a control valve and a metering valve and a pressure regulating valve is arranged between the control valve and the metering valve for controlling the pressure of the fuel being metered by the metering valve for injection into the exhaust system via the spray nozzle.

Abstract: The injection system comprises a pump designed to send fuel at high pressure to an accumulation volume, for example formed by a common rail, for supplying a plurality of injectors. The pump comprises at least one pumping element actuated with reciprocating motion with a compression stroke at a sinusoidal speed, in synchronism with each step of fuel injection. The injection system comprises at least one by-pass solenoid valve, which is controlled by a chopper control unit for modulating the delivery of the pumping element by varying both the instant of start and the instant of end of delivery during the compression stroke, in such a way that the delivery is synchronous with the injection phase.

Abstract: A method for detecting a preinjection in an internal combustion engine with a common-rail system, including individual accumulators, in which an individual accumulator pressure distribution is detected in a measurement interval and is used to determine an injection end of the main injection, in which a virtual injection start of the main injection is computed by a mathematical function as a function of the injection end, and in which the virtual injection start is set as the actual injection start of the main injection. With the preinjection activated, an actual injection delay for the main injection is determined as a function of the actual injection start, an injection delay deviation of a set injection delay from the actual injection delay is computed, and the injection delay deviation is used to determine whether a preinjection has occurred.

Abstract: A system is provided for controlling at least one fuel delivery characteristic during a combustion event within an engine. The system includes an accumulator having a variable volume, where the accumulator is configured to hold fuel at a variable pressure based on the variable volume. The system further includes a combustion chamber coupled to the accumulator. The variable volume is varied during the combustion event such that at least one fuel delivery characteristic of the fuel delivered from the accumulator into the combustion chamber is varied during the combustion event. A method and computer readable media are also provided for controlling at least one fuel delivery characteristic during a combustion event within an engine.

Abstract: An injection system for an internal combustion engine has at least one injector (18) which is coupled hydraulically to a fuel accumulator (16), a prefeed pump (12) for feeding fuel from a fuel tank (10), a high pressure pump (14) which is arranged downstream behind the prefeed pump (12) for feeding the fuel into the fuel accumulator (16), and a line (42) which branches off downstream of the prefeed pump (12) and upstream of the high pressure pump (14) and is coupled hydraulically to an exhaust section injector (47), by way of which fuel can be injected into an exhaust section of the internal combustion engine.

Abstract: A fuel supply apparatus for an engine in which calculation of a manipulated variable of a fuel pump in response to a deviation between a fuel pressure detected by a fuel pressure sensor and a target value is carried out, is configured in a manner such that when the fuel pressure sensor is failed, a change in the fuel pressure is estimated based on a required fuel flow amount of an engine, a discharge amount of the fuel pump and a fuel pressure detected immediately before the fuel pressure sensor is failed, so that deciding of the manipulated variable of the fuel pump is made, based on the estimation value. A method of controlling the fuel supply apparatus to realize the controlling of the fuel pump based on the manipulated variable is also disclosed.

Abstract: Actuating mechanism for hydraulically driven pump-injectors for internal combustion engines specifically for diesels, which in order to reduce dimensions of pump-injector body, comprises pressure intensifier with several power pistons and a pumping plunger.

Abstract: A fuel system for an internal combustion engine includes at least one first fuel pump and a pressure region into which the fuel pump pumps and which communicates with an elastic volume reservoir. The elastic volume reservoir has a characteristic pressure/volume curve, which is defined by at least two points. It is proposed that a first point is defined by a first volume at a first pressure that is somewhat greater than a vapor pressure of the fuel at ambient temperature, and that a second point is defined by a second volume and a second pressure in the pressure region that corresponds to a maximum pressure; the difference between the first and second volumes corresponds at least approximately and at least to a value by which the volume of the fuel in the pressure region decreases upon cooling down from a maximum temperature to ambient temperature.

Abstract: A fuel injection system (10) having an accumulator (24) includes an accumulator fill valve assembly (20) that regulates pressure within the accumulator (24) for operation of injection events other than the main injection. A restriction (128) in an inlet conduit and a stepped surface in a spool valve (112) provide a pressure amplifier across the accumulator valve.

Abstract: A fuel system for use in a combustion chamber of a compression ignition internal combustion engine comprises a pump arrangement having a pump chamber for fluid and a piston which is movable outwardly from the combustion chamber in response to pressure generated within the combustion chamber as a result of combustion so as to pressurise fluid within the pump chamber. The system also includes a control valve assembly for controlling the supply of fluid that is pressurised within the pump chamber to an accumulator volume.