Abstract: It is described an internal combustion engine, preferably an engine that operates according to the Diesel cycle, comprising at least one engine head (1) with a valve cover (2) and at least one fuel distribution line (4), associated with the engine head (1) through at least one through aperture (8) located in the valve cover (2). The present invention further relates to an engine head (1), particularly for use in an internal combustion engine, and to a fuel distribution line (4).

Abstract: In a common rail fuel injection system, a fuel pump pressure-feeds fuel to a common rail, which accumulates the fuel at high pressure corresponding to fuel injection pressure. An electronic control unit (ECU) drives and controls a suction control valve provided in the fuel pump to regulate a pressure-feeding amount of the fuel and to perform fuel pressure feedback control. The ECU calculates a differential term of a control amount of the suction control valve based on a pressure deviation of the fuel pressure in the common rail with respect to target pressure. The ECU sets the differential term at zero when the fuel pressure is higher than the target pressure and the differential term of the control amount is a value for pressure-feeding the fuel.

Abstract: A damper for damping pressure pulsations in a liquid includes an outer tube having an inner surface defining an interior cavity, and an inner tube positioned within the interior cavity of the outer tube. The inner tube includes an outer surface such that at least one chamber is formed between the inner surface of the outer tube and the outer surface of the inner tube for containing a gas. The damper includes an exterior surface configured to be surrounded by the liquid and an interior surface configured to define a passageway through the damper for the liquid. The damper can define at least two, and in one embodiment, four separate chambers for containing a gas. The damper can be part of a fuel rail assembly and is positioned within a fuel rail configured to contain pressurized fuel.

Abstract: A fuel supply system according to the present invention includes a first delivery pipe for intake passage injection and a second delivery pipe for cylinder injection. The second delivery pipe is provided with a relief valve. A fuel discharge section of the relief valve is connected to the first delivery pipe via a relief passage.

Abstract: A fuel injector isolation system in a high pressure fuel injection system comprises an isolated fuel rail assembly. At least one cylinder has a cylinder head. A fuel injector is coupled to and in fluid communication with the fuel rail assembly, extends axially through an opening in the cylinder head, and is moveable within the opening in relation to the cylinder head.

Abstract: A fuel injector isolation system in a high pressure fuel injection system comprises an isolated fuel rail assembly. At least one cylinder has a cylinder head. A fuel injector is coupled to and in fluid communication with the fuel rail assembly, extends axially through an opening in the cylinder head, and is moveable within the opening in relation to the cylinder head.

Abstract: An apparatus, system, and method are disclosed for intermittently delivering fluid. An injector intermittently delivers a first quantity of fluid over a first time interval. In one embodiment, the injector is passively cooled. In a certain embodiment, the injector delivers the first quantity of fluid responsive to a fluid flow measurement of a flow meter. An orifice diverts the first quantity of fluid from a primary fluid supply system over a second time interval without decreasing the supply of fluid to a primary load within a flow rate range while the fluid pressure remains within a pressure range. An accumulator accumulates at the least the first quantity of fluid as a fluid charge with positive energy.

Abstract: In a fuel supply device 1 in which high-pressure fuel in the inside of a common rail 2 which accumulates the high-pressure fuel supplied from a fuel pump 6 under pressure is supplied to an internal combustion engine by fuel injection valves, and the fuel pump 6 includes a plurality of high-pressure plungers 61 to 64 whose high-pressure-fuel injection timings are shifted from each other, a portion or all of high-pressure pipes 11 to 14 which connect fuel outlet ports 6P1 to 6P4 of high-pressure plungers 61 to 64 with the common rail 2 are connected with each other by connection pipes 30 to 33 thus establishing a state in which the high-pressure fuel from substantially one high-pressure plunger is supplied using the plurality of high-pressure pipes whereby the elevation of fuel pressures in the inside of the high-pressure pipes can be suppressed.

Abstract: The invention relates to a fuel supply device pertaining to an internal combustion engine. Said fuel supply device has a regulating device comprising a first regulator, which is provided with at least one integral part and which produces, in a first mode of operation, a regulating signal for a volume flow control valve, and a second regulator that produces a regulating signal for an electromechanical pressure regulator in a second mode of operation. In the first mode of operation, an error in the fuel supply device is identified according to the integral part of the first regulator. In the second mode of operation, an error in the fuel supply device is identified according to a detected fuel pressure and the regulating signal for the electromechanical pressure regulator.

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 feed pump of a fuel supply system for a DME engine rotates in a normal direction to supply DME fuel in a fuel tank to a high-pressure supply pump through a low-pressure fuel supply passage. The high-pressure supply pump pressurizes the DME fuel and discharges the DME fuel therefrom. The discharged DME fuel is distributed by a high-pressure fuel supply passage and injected by a fuel injector. A first fuel recovery passage connects the high-pressure fuel supply passage to the low-pressure fuel supply passage. When the engine is operated, a first solenoid valve closes the first fuel recovery passage. When the engine is stopped, the first solenoid valve opens the first fuel recovery passage and the feed pump rotates in a reverse direction, thereby the DME fuel in the low-pressure fuel supply passage and in the high-pressure fuel supply passage is recovered into the fuel tank.

Abstract: A common rail a diesel engine includes a branching connection body firmly fixed on common rail body by friction welding. A fronting face of the branching connection body to be fixed on the common rail body by friction welding is in the shape of a cone whose center part is slightly projected and whose peripheral part is a gentle cone face.

Abstract: A startup controller calculates a fuel pressure difference across a discharge stroke of a high-pressure pump at an end of an initial discharge after cranking is started. At the injection setting, the startup controller estimates a fuel pressure increment from an injection setting to an injection start based on the fuel pressure difference. The startup controller adds the fuel pressure increment to a fuel pressure sensed at the injection setting to estimate a fuel pressure at the injection start. The startup controller determines whether to perform or to prohibit the injection based on whether the estimated fuel pressure at the injection start is equal to or higher than an injection permission fuel pressure.

Abstract: In order to improve the performance of a common rail engine and reduce the number of false alarms by the exhaust gas temperature monitoring system, the present disclosure provides a control strategy for balancing injector-to-injector fueling variations for a combustion engine having multiple combustion chambers (and cylinders), with multiple individually actuated injectors for injecting fuel into the combustion chambers, wherein at least one injector is assigned to each combustion chamber and a common rail supplies fuel to the multiple injectors.

Abstract: A fuel injector for a gas turbine engine is disclosed that includes an injector body having a bore, a fitting at an inlet end of the injector body for receiving fuel, an atomizer at an outlet end of the injector body for delivering atomized fuel to a combustor of the gas turbine engine, a fuel tube disposed within the bore of the injector body for delivering fuel from the fitting to the atomizer, the fuel tube having an inlet end portion adjacent the fitting and an outlet end portion joined to the atomizer, and structure joined to the inlet end portion of the fuel tube to compensate for thermal growth of the injector body relative to the fuel tube during engine operation.

Abstract: A fuel-injection system (1, 1?, 1?) for an internal-combustion engine (2), of the type provided with compressor mechanism (4) for making available the fuel at a high pressure to an storage volume (7), and a plurality of injectors (8, 8?) fluidically connected to the storage volume (7) for taking in the fuel from the storage volume (7) and injecting it into respective combustion chambers (12) of the engine (2). The compressor mechanism (4) advantageously generates at least two distinct delivery lines (14), which are connected to respective distinct fractions (16) of the storage volume (7).

Abstract: In order to reduce the size of a tubular rail for a high-pressure fluid, the rail is obtained from a hollow body with an external diameter and an internal diameter, and has two terminal portions, each provided with an external milling to favour gripping thereof. The millings have an external diameter such as to ensure, together with a cylindrical portion of a coaxial element, a radial strength at least equal to that of the hollow body. Made between the hollow body and each cylindrical portion is a front connection. For this purpose, the cylindrical portion has a plane front surface, whilst each terminal portion has an internal milling with an internal diameter greater than the internal diameter of the hollow body so as to house the cylindrical portion and so as to form an annular shoulder. A washer of softer material is set between the annular shoulder and the front surface.

Abstract: A fuel system for an engine is disclosed. The fuel system has a source of pressurized fuel, a plurality of fuel injectors, and a common manifold configured to distribute pressurized fuel from the source to the plurality of fuel injectors. The fuel system also has a first sensor located upstream of the common manifold, and a second sensor associated with the engine. The first sensor is configured to generate a first signal indicative of a fuel temperature. The second sensor is configured to generate a second signal indicative of a speed of the engine. The fuel system further has a controller in communication with the first and second sensors. The controller is configured to estimate a fuel temperature at each of the plurality of fuel injectors based on the first signal, the second signal, and the position of the plurality of fuel injectors along the common manifold.

Abstract: An accumulator fuel injection system has fuel pressure pulsation in a common rail caused by fuel injection suppressed in an extremely simple way with a low cost system and without using an electronic control device and so on. The accumulator fuel injection system supplies high pressure fuel accumulated in an accumulating room of the common rail through high pressure fuel outlets provided equally spaced along the longitudinal direction of the common rail to a fuel injection valve of each cylinder at predetermined injection timing. The distance from an end of the accumulating room, from where a pressure wave generated therein is reflected, to a high pressure fuel outlet adjacent to the end (L1 or L2) is determined in a range of (N+0.25) times to (N+0.375) times the pitch length L of the equally spaced high pressure fuel outlets each corresponding to each cylinder, N being a nonnegative integer.

Abstract: A tubular body sealing mechanism which can easily make a hermetic seal.

Abstract: Often there is a limited fuel injector spatial envelope above and within a cylinder head for a fuel injector. In order to fit a fuel injector with a direct control needle valve and a capability of injecting fuel at a rail pressure and an intensified pressure into the limited fuel injector spatial envelope, the present disclosure includes a fuel injection system in which a pressure intensifier and nozzle outlets of a fuel injector are fluidly connected to a source of fuel via an intensifier line and an injector line, respectively. The flow of fuel to the pressure intensifier is controlled via a valve attached to the source of fuel.

Abstract: A fuel control method and system is provided for delivering fuel to an engine that employs an engine controller that is configured to the fuel injection quantity delivered to the engine. The engine controller is configured to: calculate a fuel injection quantity based on at least one operating condition of an engine; calculate an estimated fuel pressure value of the high pressure fuel that will be acting on a fuel injection valve when the prescribed fuel injection timing is reached at a prescribed calculation time occurring before the prescribed fuel injection timing; correct the fuel injection quantity that was previously calculated to a corrected fuel injection quantity based on the estimated fuel pressure value that will exist at the prescribed fuel injection timing; and open the fuel injection valve at the prescribed fuel injection timing to discharge a quantity of fuel equal to the corrected fuel injection quantity.

Abstract: A fuel pressure control device has a feedback control section for setting a feedback control amount (F/B control amount) in accordance with a deviation between target fuel pressure and actual fuel pressure and a feedforward control section for setting a feedforward control amount (F/F control amount) in accordance with a required fuel injection amount and engine rotation speed. When an engine operation state is an off-idling condition, F/F-F/B combination control for validating the F/F control amount and for setting a control amount of a high-pressure pump by adding the F/F control amount to the F/B control amount is performed. When the engine operation state changes from the off-idling condition to an idling condition, control is switched to F/B single control for invalidating the F/F control amount and for using only the F/B control amount.

Abstract: A fuel supply system for supplying an internal combustion engine with fuel comprises an electric fuel pump arranged with a fuel tank. A fuel line leading to the internal combustion engine is connected with the fuel pump. A return line returning fuel toward the fuel pump is connected with the fuel line. Further, a shunt is connected with the fuel line via which a sucking jet pump arranged in the fuel tank is operated. The fuel supply system comprises a pressure control system that opens or closes the connection of the shunt to the fuel line at a first pressure and opens or closes the connection of the return line with the fuel line at a second pressure. When the pressure increases, the shunt and the return line are opened by the pressure control system, and when the pressure drops, they are closed.

Abstract: A juncture and method for changing direction of fuel flow in a high pressure fuel injection system such as a common rail and/or a fuel pump, the juncture comprising a body, a first passage formed in the body having a first diameter and a longitudinal axis extending therethrough, the first passage including a groove positioned along a portion of the longitudinal axis, and a second passage formed in the body having a second diameter, a central axis extending therethrough, and an opening, the opening of the second passage being provided in the groove of the first passage to allow fluidic communication between the second passage and the first passage so that stresses at the juncture caused by high pressure fuel changing direction of flow is reduced. The juncture is made from a bottom poured ingot cast alloy steel.

Abstract: Wire harness mounting structure for fuel distributor pipe comprises at least one pair of first and second guide claws provided on an outer periphery of the fuel distributor pipe with having a space along the longitudinal axis thereof, the first guide claw has a first wire harness support groove opened to one side, and the second guide claw has a second wire harness support groove opened to opposite side, the wire harness extending from the female type connector is inserted and retained in the first and second wire harness support grooves of the first and second guide claws, respectively, whereby additional mounting members for assembling is not required, and the assembling operation can be performed readily.

Abstract: A low-pressure delivery pipe provided with intake manifold injectors, a fuel pressure regulator, a high-pressure fuel pump, a high-pressure delivery pipe provided with in-cylinder injectors, and an electromagnetic relief valve are connected in series at the downstream of a low-pressure fuel pump that discharges a fuel within a fuel tank at a prescribed pressure. Since the low-pressure delivery pipe is arranged downstream of the low-pressure fuel pump, the fuel pressure within the low-pressure delivery pipe is lowered upon stop of vehicle operation, in response to stop of the low-pressure fuel pump. The fuel pressure within the high-pressure delivery pipe is also lowered in response to stop of the low-pressure fuel pump, by opening the electromagnetic relief valve upon stop of vehicle operation. Thus, oil tightness of the injectors during the stop of vehicle operation is ensured.

Abstract: An improved fuel rail for delivering fuel to a fuel injector for an internal combustion engine is provided that reduces the weight of the fuel injection system, greatly reduces manufacturing costs by eliminating expensive manufacturing methods, such as brazing, high heat welding, post plating, blow molding, and extrusion, and enhances low-cost, low-energy methods for attachment of fuel system components to the fuel rail. The improved fuel rail includes an tubular body defining a fluid chamber and having an inlet through which fuel enters the fluid chamber and a fuel injector port in fluid communication with the fluid chamber. The port is configured to receive the fuel injector. The tubular body is formed as a laminate having an inner metallic layer and an outer polymeric layer. The inner metallic layer may comprise aluminum and the outer polymeric layer may comprise nylon. Plastic or metal components can be attached to the laminated tubular body while providing a fluid tight, pressurized joint.

Abstract: The high-pressure pump (7) comprises a number of pumping elements (18) actuated in reciprocating motion through corresponding suction and delivery strokes. Each pumping element (18) is provided with a corresponding intake valve (25), in communication with an intake pipe (10), supplied by a low-pressure pump (9). Arranged on the intake pipe (10) is a shut-off valve (27) controlled in a choppered way in synchronism with an initial part (32; 32?) of the suction stroke of each pumping element (18).

Abstract: A fuel supply apparatus suppresses bubble generation of fuel in a delivery pipe and fuel leakage while suppressing power consumption. The fuel supply apparatus includes a fuel supply controller which is provided with a state determining unit that determines at least one of bubble generation of fuel in the delivery pipe and fuel leakage from a fuel injection valve to which fuel is supplied via the delivery pipe, and a fuel pressure controlling unit that activates a fuel feeding unit when the bubble generation is expected and activates a fuel pressure decreasing unit when the fuel leakage is expected. The fuel supply controller intermittently activates during the suspension of the operation of internal combustion engine using a timer, to adjust fuel pressure in the delivery pipe.

Abstract: A fuel pressure control device has a feedback control section for setting a feedback control amount (F/B control amount) in accordance with a deviation between target fuel pressure and actual fuel pressure and a feedforward control section for setting a feedforward control amount (F/F control amount) in accordance with a required fuel injection amount and engine rotation speed. When an engine operation state is an off-idling condition, F/F-F/B combination control for validating the F/F control amount and for setting a control amount of a high-pressure pump by adding the F/F control amount to the F/B control amount is performed. When the engine operation state changes from the off-idling condition to an idling condition, control is switched to F/B single control for invalidating the F/F control amount and for using only the F/B control amount.

Abstract: Embodiments include a fuel rail and method for making the fuel rail. Embodiments of the fuel rail include an elongate tubular body with a wall defining a lumen, the elongate tubular body formed with a thermoset composite material, and a pressure port having a lumen in fluid communication with the lumen of the elongate tubular body.

Abstract: A fuel-injection system (1, 1?, 1?, 1??) for an internal-combustion engine (2), of the type provided with compressor mechanism (4) for making available the fuel at a high pressure to an storage volume (7), and a plurality of injectors (8, 8?, 8??) fluidically connected to the storage volume (7) for taking in the fuel from the storage volume (7) and injecting it into respective combustion chambers (12) of the engine (2). The storage volume (7) is advantageously split into a plurality of distinct elementary storage volumes (9, 9?, 9a, 9b) fluidically connected to one another.

Abstract: A first fuel discharge path and a first return pipe that collectively discharge the amount of flow of fuel flowing out of the piston control chamber of a pressure intensifier built in an injector and the amount of flow of fuel flowing out of the nozzle back pressure chamber of a fuel injection nozzle (including the amount of flow of leak fuel) to a fuel tank and a second fuel discharge path and a second return pipe that discharge only the amount of flow of return fuel flowing out of the solenoid valve chamber of a solenoid valve are mounted separately from and independently of each other in terms of pipe line. With this measure, pressure in the solenoid valve chamber can be controlled to a value lower than the limit of resistance to pressure of an O-ring.

Abstract: An object of the invention is to provide a fuel injector delivery pipe which does not require a tool for holding an upper part and lower part together, and thereby eliminate the process of attaching and removing the tool, and increases the efficiency of the operation. Furthermore, in order to achieve this object, the fuel injector delivery pipe comprises an upper part 2 with an inverted substantially U-shaped vertical cross-section in the longitudinal direction formed with a top wall 2a and two side walls 2b, 2b, and also comprises a lower part 3 with a substantially U-shaped vertical cross-section in the longitudinal direction with a bottom wall 3a and two side walls 3b, 3b. Locking parts 5, 10 are formed in both side walls 2b, 2b of the upper part 2 and in both side walls 3b, 3b of the lower part 3 respectively for locking together the walls, and the locking parts 5, 10 are locked together to temporarily lock the upper part 2 and the lower part 3 together while the parts are integrated by brazing.

Abstract: A bush incorporated in a common rail is formed with a smallest diameter orifice having a small inner diameter and an adjacent orifice having an inner diameter larger than that of the smallest diameter orifice on an inner peripheral face of the bush. A press-fitted portion, which is press-fitted into an inside-outside communication hole, and a non-press-fitted portion, which has a smaller outer diameter than the press-fitted portion, are formed on an outer peripheral face of the bush. The smallest diameter orifice and the press-fitted portion are deviated from each other in an axial direction of the bush to prevent an overlap in a radial direction of the bush. Thus, even if the bush is tightly press-fitted into the inside-outside communication hole, decrease of the inner diameter of the smallest diameter orifice can be averted.

Abstract: A fuel supplying apparatus of an internal combustion engine includes a first fuel supply system, a second fuel supply system, and a pulsation propagation suppressing unit. The first fuel supply system pressurizes a fuel by a low-pressure pump, and supplies the fuel pressurized by the low-pressure pump to a first fuel injection mechanism. The second fuel supply system is branched from the first fuel supply system, further pressurizes the fuel, pressurized by the low-pressure pump, by a high-pressure pump that is driven according to an operating state of the internal combustion engine, and supplies the fuel pressurized by the high-pressure pump to a second fuel injection mechanism. The pulsation propagation suppressing unit is provided in at least one of the first fuel supply system and the second fuel supply system, and suppresses propagation of a pulsation generated in the high-pressure pump to the first fuel injection mechanism.

Abstract: A ring-shaped connecting portion is formed on a seat surface side of a pipe connector. The connecting portion is tapered so that thickness thereof gradually reduces toward a tip end thereof. A protrusion is formed on the tip end of the connecting portion. A ring-shaped groove is formed on a flat outer peripheral surface of a common rail. By fitting the protrusion into the groove, the connector can be positioned to a predetermined position of the common rail. In this structure, current can be concentrated to the protrusion and current density can be increased. As a result, sufficient bonding strength can be attained.

Abstract: A vibration-reducing structure for a fuel pipe includes a fuel hose, and a pulsation damper. Fuel is supplied to an engine installed in a vehicle through the fuel hose. The pulsation damper is disposed on the fuel hose at a predetermined position. The pulsation damper suppresses pulsations of fuel. The fuel hose is fixed to a vehicle body at the predetermined position.

Abstract: A method for operating a fuel metering system of a motor vehicle is provided, in which fuel is delivered by at least one supply pump to at least one high pressure area, the fuel being injected by at least one fuel injector from the high pressure area directly into at least one combustion chamber, at least one sensor detecting the pressure in the high pressure area, and at least one pressure regulating element being provided for adjusting the pressure in the high pressure area.

Abstract: In a common rail operating method and system, an arrangement for controlling the rail pressure is provided with a rail pressure controller including a current control circuit for controlling a suction throttle valve operating current (i) which valve is arranged in the fuel supply line to a high pressure pump supplying high pressure fuel to the common rail. The suction valve operating current control circuit includes a preliminary control value generator which serves also as an emergency control signal generator for the control of the suction valve if an error occurs in the system at least to permit an orderly engine shutdown procedure.

Abstract: An arrangement in a fuel injection system for controlling the fuel injection includes a body part having a space, through which the fuel to be injected during operation flows, and a fuel inlet opening and an outlet opening opening into the space. A piston is arranged movably inside the space, the piston having a channel arranged therein for creating a flow connection between the fuel inlet opening and the outlet opening, whereby the piston divides the space into a first part connected with the inlet opening and a second part connected with the outlet opening. A spring creates a force acting on the piston in a direction opposite to that of the main fuel flow. The piston and the body part are formed so that when the piston is in the end adjacent the fuel inlet opening it delimits a third space, the volume of which depends on the mutual positions of the piston and the body part.

Abstract: A common rail fuel injection apparatus (1) for a multi-bank, diesel locomotive engine (10). A common rail (20,22) is disposed proximate each bank (20,22) of cylinders (12) of the engine to provide high pressure fuel (30) to a fuel flow control apparatus (14) associated with each respective cylinder. A plurality of high-pressure fuel pumps (34) provides high-pressure fuel to at least one of the common rails. A fluid cross connection (38) is provided to convey high pressure fuel between the two common rails, thereby providing for the continued delivery of fuel to all cylinders in the event of a failure of one of the high pressure pumps. The high-pressure pumps are motivated by fuel lobes (64) located on camshaft sections (50a, 50b, 50c) adjoined at a gear driven end 58 of the camshaft (50).

Abstract: The injection system has a pump for supplying high-pressure fuel to a storage volume for supplying a number of injectors. The pump has at least one reciprocating pumping element performing a compression stroke synchronously with each fuel injection. The injection system has at least one control device for controlling the amount of fuel supplied by the pump to the storage volume, and which is controlled by a chopper control unit to modulate the fuel volume introduced into the compression chamber during the intake stroke (Ps-Pi). The delivery start instant of the pumping element during the compression stroke being unequivocally defined by the fuel volume introduced.

Abstract: An apparatus, system, and method of damping pressure pulsations and attenuating noise transmission in a fuel supply system. The apparatus includes a first end in fluid communication with a fuel supply line, a second end in fluid communication with a manifold, and a body that couples in fluid communication the first and second ends. The first end is adapted to receive fuel from a pump. The second end is adapted to supply the fuel to a plurality of nozzles in individual fluid communication with the manifold. And the body includes a tube that is arranged in a helix around a central axis.

Abstract: Immediately before fuel pressure is increased by a pressure-increase mechanism, a pressure-increase control valve of each cylinder is opened in timing that does not overlap the timing of opening of an injection control valve, and the period of time for which the pressure-increase control valves is opened is gradually increased. As a result, it is possible to prevent the quantity of fuel consumed by the pressure-increase mechanism from rapidly increasing when the increase of fuel pressure is started.

Abstract: When an engine operation is stopped, a bypass passage returning fuel in a fuel supply passage into a fuel tank is opened to return a part of the fuel in the fuel supply passage, and a fuel pressure in the fuel supply passage is lowered to a predetermined fuel pressure higher than the atmospheric pressure, to be regulated.

Abstract: Engineers have come to learn that a fuel injection system with a variety of capabilities to produce a variety of injection strategies can better perform and reduce emissions at all engine operation conditions than a fuel injection system limited in its control over injection timing, number, quantity and rate shapes. According to the present invention, in order to increase the variability of available injection strategies, a fuel injection system includes at least one fuel injector fluidly connectable to at least a first common rail and a second common rail. By fluidly connecting the fuel injector to the first common rail, fuel can be injected at a first pressure. By fluidly connecting the fuel injector to the second common rail, fuel can be injected at a second pressure that is independent of the first pressure.

Abstract: A common-rail fuel injection system includes a common rail, an injector, a control device and a pressure sensor. The common rail stores the high-pressure fuel. The injector injects the fuel stored in the common rail. The control device obtains an injection quantity from the injector in accordance with an operating state so as to control and on-off valve of the injector based on the injection quantity. The common-rail pressure sensor detects a common-rail pressure of the fuel stored in the common rail. The control device includes correction means for, obtaining a pressure drop quantity of the common rail pressure upon establishment of a predetermined learning condition, obtaining a leakage quantity change of the injector, and correcting the injection quantity based on the leakage quantity change.

Abstract: A device and a method for determining pressure fluctuations in a fuel supply system provide two signal filters to enable determining as much information about pressure fluctuations as possible with minimal sensor use. A sensor signal which is characteristic of a pressure in the area of a fuel injector is filtered using the two filters, which have filter characteristics that differ from one another.