Abstract: The device includes a connection tube in communication with a hole of a rail for fuel under pressure, the tube being provided with an end swelling. The device has a first threaded element fixed to the rail in a position corresponding to the hole and a second threaded element designed to engage the first threaded element. Removably set between the hole and the swelling is a seal element designed to form a seal both with the hole and with the swelling. The seal element is a body of revolution equipped with a passage along a pre-set axis, and includes two end noses designed to be inserted in the swelling and in the hole, respectively, and two tapered seal stretches.

Abstract: An engine includes a fuel delivery system having a fuel rail and fuel delivery devices, such as fuel injectors, that deliver fuel to corresponding cylinder assemblies. The use of the fuel rail and fuel injectors allows unused fuel to be purged from the engine at the end of the engine's operating cycle, thereby minimizing the creation of fuel vapor within the engine. The fuel delivery system also includes fuel rail coupling members that are constructed and arranged to secure each cylinder assembly to the fuel rail and to absorb load generated by the corresponding cylinder assembly on the fuel rail during operation. The fuel rail coupling members allow motion of the cylinder assemblies relative to the fuel rail during operation and minimize the application of potentially damaging forces on the fuel rail.

Abstract: The present invention relates to an internal combustion engine having a high pressure fuel injector (1) which is arranged in a common rail arrangement, in order to improve the accuracy over in particular a service life of a high pressure fuel injector (1), comprising at least one nozzle needle (5), which can be pressed with a pressing force against a valve seat (12), and at least one solid-state actuator (3) which acts on an actuating piston (23) and is connected directly to a rail pressure supply (7), wherein at least one hydraulic operative connection (22) between the actuating piston (23) and a differential piston (4), which is operatively connected to the nozzle needle (5), is provided in such a way that an activation of the solid-state actuator (3) acts directly on the actuating piston (23), thereby permitting a pressure increase by means of the actuating piston (23) above a rail pressure, which pressure increase, via the differential piston (4), counteracts the pressing force such that the nozzle needle

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: An internal combustion engine includes an engine housing, a common rail, and a pressurization device for the common rail which includes a plurality of intensifier pistons, and an hydraulically actuated control valve movable between a first position at which it fluidly connects a source of pressurized actuation fluid with one of said intensifier pistons but not a second one of the intensifier pistons, and a second position at which it fluidly connects the at least one fluid inlet with the second one of the intensifier pistons but not the first one of the intensifier pistons.

Abstract: A method is described for operating a fuel system during start up, the system utilizing gasoline direct injection for an internal combustion engine including a first pump and second pump, an electromechanical valve, and a check valve fluidly coupled downstream of the first pump. The fuel system further includes a fuel rail downstream of the check valve and direct fuel injectors coupled to the engine. The method includes generating a flow of fuel in the fuel system via the first pump during an engine start before ignition of the engine; actuating the valve during the fuel flow to generate a pressure wave that travels through the fuel system past the check valve; and injecting fuel via the direct fuel injectors at an increased pressure generated by the pressure wave and held in the fuel rail via the check valve.

Abstract: The invention provides a fuel supply device, which is possible to prevent undesired water entered into a fuel path from remaining therein with a simple arrangement. A fuel supply pipe for supplying fuel to each of the fuel injection valves of an engine disposed with a plurality of cylinders in a vertical direction includes a fuel path in longitudinal direction, a smaller diameter portion formed perpendicular to the fuel path and continuous with a fuel injection valve mounting hole, and a cap attached to a lower end of the fuel path. The cap is arranged so that the upper end of its protruding portion is positioned at the same or nearly same level as that in height of the smaller diameter portion. Thus, the water entered in the fuel supply pipe is exhausted through the smaller diameter portion without delay.

Abstract: The injection system (1) comprises a pump (7) designed to send fuel at high pressure to an accumulation volume, for example formed by a common rail (6), for supplying a plurality of injectors (5). The pump (7) comprises at least one pumping element (18) actuated with reciprocating motion with a compression stroke (Pi-Ps) at a sinusoidal speed (24), in synchronism with each step of fuel injection. The injection system (1) comprises at least one by-pass solenoid valve (14), which is controlled by a chopper control unit (16, 28) for modulating the delivery of the pumping element (18) by varying both the instant of start (To) and the instant of end (T1) of delivery during the compression stroke (Pi-Ps), in such a way that the delivery is synchronous with the injection phase.

Abstract: An apparatus for attenuating fuel pump noise in a direct injection internal combustion engine. In one proposal, the direct injection fuel nozzle is suspended from a fuel rail in a fashion that avoids direct metal-to-metal contact between the injector and the engine block. The direct injection nozzle may also be connected to the fuel rail by a pair of spaced-apart seals which equalize the longitudinal pressure on the nozzle during operation. Enlarged diameter fuel reservoirs and/or a restricted orifice may be provided fluidly in series between the fuel pump and the direct injection nozzle in order to attenuate noise resulting from fuel pump pulsation. A clip holder and clip plate mount the fuel injector to the injector cup.

Abstract: A high-pressure fuel pump control device is capable of reducing current consumption, increasing pump durability, and promoting a rise of fuel pressure from startup. The high-pressure fuel pump control device comprises a fuel injector valve for directly injecting fuel in a common rail into a combustion chamber and a high-pressure fuel pump for feeding the fuel under pressure to the common rail. The high-pressure fuel pump comprises a pressurization chamber, a plunger for pressurizing the fuel in the pressurization chamber, a fuel passage valve disposed in the pressurization chamber, and an actuator for actuating the fuel passage valve. The control device includes a control unit for executing output control of a drive signal for the actuator to vary a discharge rate of the high-pressure fuel pump.

Abstract: A purpose of the present invention is to provide a fuel delivery pipe having a flexible absorb wall surface formed on a wall surface thereof in which a fuel introduction pipe is connected to an interior of the fuel delivery pipe body at one end thereof in a longitudinal direction in order to achieve a suppression of a transfer of a first mode of a standing wave and a second mode of the standing wave and an enhanced placement layout and inexpensive cost. The fuel delivery pipe includes the flexible absorb wall surface formed on the wall surface thereof and injection nozzles, in which fuel introduction pipe 10 is connected to one end of fuel delivery pipe body 1 of a returnless type without a circuit returning to a fuel tank and is coupled with the fuel tank through an underfloor pipe arrangement.

Abstract: A device for determining abnormality of a fuel supply system, which is capable of determining abnormality of the fuel supply system including a fuel pressure sensor more accurately. A device for determining abnormality of a fuel supply system that has a fuel pressure sensor for detecting pressure of fuel in an accumulator as detected fuel pressure calculates a predetermined normal-time fuel pressure indicative of pressure fuel in the accumulator which is to be detected when the system is normal, according to a fuel flow rate relationship parameter indicative of a relationship between an inflow fuel amount parameter indicative of an amount of fuel flowing into the accumulator and an outflow fuel amount parameter indicative of an amount of fuel flowing out of the accumulator, and determines abnormality of the fuel supply system based on a result of comparison between the detected fuel pressure and the calculated normal-time fuel pressure.

Abstract: A fuel injection system includes a fuel injector socket including a first attachment feature and a fuel injector including a second attachment feature that corresponds with the first attachment feature. The first attachment feature engages with the second attachment feature connecting the fuel injector to the fuel injector socket and preventing rotational movement of the fuel injector relative to the fuel injector socket. The corresponding attachment features not only enable simple connection and disconnection of a fuel injector to a fuel injector socket of a fuel rail, but can also be integrated into existing injector to fuel rail assembly processes and are applicable in any fuel injection system. The corresponding attachment features may be used with metal fabricated fuel rail assemblies as well as for fuel rail assemblies where the manifold supply tube and the fuel injector sockets are overmolded with a plastic material.

Abstract: A common rail fuel injection system having a low-pressure region from which a high-pressure fuel pump acts on fuel with high pressure and delivers it to a high-pressure fuel accumulator from which fuel is supplied to injectors that inject the highly pressurized fuel into the combustion chamber of an internal combustion engine in which the high-pressure pump, the high-pressure fuel accumulator, and the injectors are associated with a high-pump, pressure region. In order to avoid undesirable delays in the starting of the internal combustion engine, a check valve device is connected between the low-pressure region and the high-pressure region so that when a negative pressure is generated in the high-pressure region, fuel flows from the low-pressure region into the high-pressure region.

Abstract: A fuel injection system (1) with at least one fuel injector (1a) and a heatable adapter (1b), which is connected to a fuel rail (1c) and to the fuel injector (1a) of the fuel injection system (1); a thermoswitch (2) is provided in the fuel rail (1c), which is connected with an external door contact switch (3) and with the heatable adapter (1b). The thermoswitch (2) includes a thermosensor, so that a reliable cold start is ensured by the fact that, when a previously specified fuel temperature is fallen below, the thermoswitch (2) switches over and causes fuel (8) to be heated.

Abstract: The invention relates to a device for supplying fuel under high pressure in which the fuel is put under high pressure by a transfer pump, characterized by the fact that it comprises two identical transfer pumps (3, 4), powered by a control means, controlling the fuel feed rate of the two pumps, the latter supplying the same common rail (2).

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: A fuel injection device (fuel supply system) of a common rail type fuel injection system for an engine includes a pressure sensor disposed in a fuel inlet of an injector for measuring a fuel pressure at a position where the sensor is disposed and an ECU for sensing various kinds of pressure fluctuations associated with the injection including a pressure leak due to an injection operation of the injector and waving characteristics due to actual injection thereof based on sensor outputs from the pressure sensor. The ECU serially obtains the sensor outputs from the pressure sensor at intervals of 20 ?sec.

Abstract: An accumulator fuel injection apparatus is provided in which average pressure in the common rail can be detected by an extremely simple and inexpensive means with increased accuracy to be used as a control signal for controlling fuel injection. A pressure detection room is formed at an end part of the accumulation chamber such that the pressure detection room is connected to the accumulation chamber of the common rail, an orifice is provided between the pressure detection room and the accumulation chamber of the common rail to communicate the pressure detection room with the accumulation chamber by a throttled sectional area, and a common rail pressure sensor for detecting fuel pressure in the accumulation chamber is attached to an end of the common rail to face the pressure detection room.

Abstract: A fuel pressure sensor diagnosing device for diagnosing a fuel pressure sensor for detecting pressure in a common rail in which a high-pressure fuel to be supplied to an engine is accumulated, the device comprising: fuel temperature detection means for detecting fuel temperature; and failure determination means, provided with the fuel temperature detection means for detecting fuel temperature via subsequent to stopping of the engine, for obtaining a resting and stabilization time between when the pressure in the common rail drops and when the pressure stabilizes on the basis of this detected fuel temperature, detecting a stabilized fuel pressure via the fuel pressure sensor subsequent to lapse of the resting and stabilization time, and determining a failure of the fuel pressure sensor when the detected stabilized fuel pressure exceeds a predetermined upper limit threshold value or is less than a predetermined lower limit threshold value.

Abstract: A fuel injection system for an internal combustion system includes an Engine Management System (EMS), a fuel feed pump, a return line, a high-pressure pump, supplying fuel under pressure to a common rail, a hydraulically operated valve forming an outlet chamber connected to the common rail and a control chamber, the valve being designed such that, in its closed position, the valve prevents the flow out of the outlet chamber, and an electrically operated pilot valve. A nozzle with a resilient member that biases the nozzle towards closing is connected to the outlet of the hydraulically operated valve in such a way that pressure at the outlet of the hydraulically operated valve tends to overcome the force of the resilient member and open the nozzle. An electrically operated spill valve is connected between the outlet of the hydraulically operated valve and the return line.

Abstract: An engine includes a fuel rail and fuel delivery devices, such as fuel injectors, that deliver fuel to corresponding cylinder assemblies. The use of the fuel rail and fuel injectors allows unused fuel to be purged from the engine at the end of the engine's operating cycle, thereby minimizing the creation of fuel vapor within the engine. The fuel rail is assembled from modular fluid conduit adaptors and fluid conduits. With such modularity, a custom fuel rail can be assembled for any size engine. The use of the fluid conduit adaptors and fluid conduits allows motion of the cylinder assemblies relative to the fuel rail during operation to minimize the application of potentially damaging forces on the fuel rail.

Abstract: A fuel injection apparatus having a plurality of high pressure fuel injection pumps for supplying fuel to a common rail, of which amounts of fuel discharge can be controlled by a fuel supply amount adjusting device of simple and reliable construction. The fuel supply amount adjusting device is provided to fuel feed passages for feeding fuel to the plunger rooms. The adjusting device includes a spool valve device for varying opening area of each of passages for introducing fuel into each of the plunger rooms by sliding a spool fitted slidably in a spool valve case, a spool drive device for sliding the spool, and a controller for controlling the spool drive device so that the spool is slid to a position at which the opening area coincide with area required depending on engine operating conditions.

Abstract: In a fuel supply apparatus for an engine, which is provided with a relief valve for returning fuel in a fuel pipe into a fuel tank when a fuel pressure exceeds a threshold, and also feedback controls a discharge amount of a fuel pump so that the fuel pressure detected by a pressure sensor approaches a target pressure, when the pressure sensor is failed, a duty of a PWM signal for the fuel pump is fixedly maintained at a predetermined value, and fuel injection pulse width is calculated on the assumption that the fuel pressure is held at the threshold.

Abstract: A method and apparatus for attenuating fuel pump noise in a direct injection internal combustion engine. In one proposal, the direct injection fuel nozzle is suspended from a fuel rail in a fashion that avoids direct metal-to-metal contact between the injector and the engine block. The direct injection nozzle may also be connected to the fuel rail by a pair of spaced-apart seals which equalize the longitudinal pressure on the nozzle during operation. Enlarged diameter fuel reservoirs and/or a restricted orifice may be provided fluidly in series between the fuel pump and the direct injection nozzle in order to attenuate noise resulting from fuel pump pulsation.

Abstract: An engine for a vehicle, which is configured to enable a combustion stroke to occur in a plurality of cylinders substantially simultaneously, comprises a fuel pipe coupled to a fuel supply source for storing a fuel, a plurality of fuel injectors which are attached to the fuel pipe to respectively correspond to the plurality of cylinders and are configured to inject the fuel to their associated cylinders, and a damper chamber which is provided at the fuel pipe and has an inner space connected to an inner space of the fuel pipe.

Abstract: A small-diameter circular column portion having a diameter slightly smaller than that of a small-diameter hole (press-fitting hole) of an inside-outside communication hole is formed at a press-fitting end portion of a bush. A narrow annular clearance is formed between the small-diameter circular column portion and the small-diameter hole when the bush is press-fitted. Even if a press-fitting burr is produced at the press-fitting end portion during manufacturing of a common rail, the press-fitting burr is confined in the depth of the annular clearance. Even when fuel flows through the inside-outside communication hole during engine operation, movement of the fuel and the fuel flow acting on the press-fitting burr are limited in the depth of the annular clearance, inhibiting the press-fitting burr from dropping out or flowing out. Thus, a highly reliable common rail can be provided at low cost.

Abstract: A connection arrangement for a tube is provided. The invention connection arrangement comprises a device configured to communicate fluid from an inlet to an outlet wherein the device includes at least one fitting having a plurality of protrusions extending therefrom. The connection arrangement further includes a polymer coated tube comprising aluminum material coupled with the fitting of the device, and the tube is configured to communicate matter with the device. The tube has an outer surface, an inner surface, at least one open end, a center passageway, a longitudinal axis extending through the center passageway, and a polymer coating. When mated together, the protrusions of the fitting create a tight seal and connection between the fitting and the tube.

Abstract: A common-rail fuel injection system includes an injector, a flow damper, a common rail having a rail main body, a piston upstream side supply passage, a piston upstream side orifice disposed in the upstream side supply passage to reduce its cross-sectional area, a piston downstream side supply passage, and a piston downstream side orifice disposed in the downstream side supply passage to reduce its cross-sectional area. The damper includes a valve body having a fuel passage, one end of which communicating with the main body and the other end of which communicating with the injector, and a piston slidably held in the fuel passage. Fuel flows from a pressure accumulating chamber in the main body into the piston through the upstream side supply passage, and flows from the piston into the injector through the downstream side supply passage.

Abstract: A fuel feed apparatus is provided for supplying high-pressure fuel to a common rail of an accumulator fuel injection system. The accumulator fuel injection system includes an injector for injecting high-pressure fuel accumulated in the common rail into a combustion chamber of an internal combustion engine. The fuel feed apparatus includes a high-pressure pump for press-feeding fuel to the common rail, and a feed pump for pumping fuel from a fuel tank to the high-pressure pump. A fuel filter is provided downstream of the feed pump for filtering fuel pumped from the feed pump. A return passage is provided for returning fuel from a downstream of the feed pump to an upstream of the feed pump. A return flow control unit is provided for controlling fuel retuning through the return passage.

Abstract: A fuel injection controller calculates a fuel pressure-feeding start angle of a fuel pump as a valve opening start angle of a metering valve, which regulates a discharge amount, by adding a base angle and a feedback correction value. The base angle is calculated in accordance with a command injection amount and target fuel pressure based on a basic map. The feedback correction value is calculated based on differential pressure between sensed fuel pressure and the target fuel pressure. If an abnormality is caused in either one of two metering valves, the base angle is calculated based on an abnormal period map instead of the basic map. Thus, controllability of the fuel pressure is maintained high even when the abnormality is caused in a part of multiple pressure-feeding systems including multiple plungers of the fuel pump.

Abstract: A fluid apparatus, which is provided for supplying fluid into an internal combustion engine, includes an upstream pump, which is electrically driven, having an outlet port. The fluid apparatus further includes a downstream pump, which is electrically driven, having an inlet port that is connected with the outlet port in series. The fluid apparatus further includes an open-close unit. The open-close unit communicates a fluid passage through which the upstream pump supplies fluid to the internal combustion engine when the downstream pomp stops. The open-close unit blocks the fluid passage when the downstream pomp operates.

Abstract: A fuel control system for an engine is disclosed. The fuel control system may have a source of pressurized fuel and at least one injector configured to receive and inject the pressurized fuel. The fuel system may also have a sensor configured to generate a signal indicative of an actual fuel pressure at the at least one injector, and a controller in communication with the sensor. The controller may be configured to determine a desired fuel pressure at the at least one injector, and compare the signal to the desired fuel pressure. The controller may also be configured to initiate a leak detection sequence in response to the comparison.

Abstract: A fuel system for an engine is disclosed. The fuel system has a first source configured to pressurized fuel to a first pressure, and a second source configured to pressurized fuel to a second pressure. The fuel system also has a fuel injector configured to receive fuel at the first pressure and the second pressure, and a valve disposed between the fuel injector and the first and second sources. The valve is configured to modify the pressure of fuel from the first source based on a pressure of fuel from the second source.

Abstract: The invention relates to an internal combustion engine comprising a high-pressure accumulator injection system wherein the swept volume and the pressure are regulated by means of a volume flow control valve (VCV) and a pressure control valve (PCV). The inventive method consists in checking, during the overrun condition of the internal combustion engine, whether predetermined release conditions for carrying out the diagnosis are fulfilled, and in the event of a positive result, the control valve (VCV) is closed for a predetermined period of time (t1). During said period (t1), values relating to fuel pressure (FUP) are detected by means of the pressure sensor (21) and compared with a predetermined threshold value (FUP-SW), the control valve (VCV) being deemed faultless if said fuel pressure (FUP) values are sufficiently often below the threshold value (FUP_SW) during the cited period of time (t1).

Abstract: An injector includes a boosting mechanism and a nozzle. The boosting mechanism boosts fuel, and the nozzle injects and supplies the fuel boosted by the boosting mechanism. The boosting mechanism includes a tubular piston and a column piston. The tubular piston has a bore, which extends through the tubular piston in a direction of a longitudinal axis of the tubular piston. The column piston is loosely received by the tubular piston and has an end portion, which projects from the tubular piston, and which is engaged with the tubular piston. The tubular piston is slidably received by a first cylinder. The end portion of the column piston is slidably received by a second cylinder, which is provided generally coaxially to the first cylinder, and which has a diameter different from that of the first cylinder.

Abstract: A fuel injection system having a high-pressure side which includes at least one high-pressure reservoir, in which fuel is stored at injection pressure, and at least one injector communicating with the high-pressure reservoir for fuel injection at a cylinder of the engine. The fuel injection system moreover has a low-pressure side which communicates at least indirectly with a fuel tank. The high-pressure side has a communication with the low-pressure side, which communication is controlled as a function of the fuel temperature in the high-pressure side and at a high fuel temperature is at least substantially closed, so that the high-pressure side is disconnected from the low-pressure side, and that is open at a low fuel temperature.

Abstract: The invention relates to a device for damping liquid pressure waves in conduits and containers that conduct and/or store liquids, in particular in conduits and containers of injection systems in motor vehicles. To convert vibrational energy into thermal energy, at least one reflection surface for reflecting at least some of the liquid pressure waves is provided in the container or in the conduit in a region that is separate from the remainder of the container or the conduit.

Abstract: A fuel injection apparatus for engines is provided, with which occurrence of cavitation erosion on constituent parts of the high pressure fuel pump and fuel feed line to the pump in the apparatus is suppressed and high durability is attained even in the case of a high pressure fuel pump increased largely in capacity. Each of high pressure fuel pumps to supply high pressure fuel to a common rail comprises an electromagnetic valve which is controlled by a controller such that fuel is discharged from the plunger room by closing the electromagnetic valve in the up stroke of the plunger until the plunger reaches its top dead center, the electromagnetic valve is kept closed for some period in the down stroke of the plunger, then the electromagnetic valve is opened to allow the plunger room to be communicated with a fuel feed/spill passage.

Abstract: A fuel injection apparatus with which energy for driving the high pressure fuel pumps of the apparatus by proper operation of the high pressure fuel pumps in order to reduce waste energy, and a method of operating an engine equipped with the apparatus, are provided. The apparatus is provided with a controller which allows some of the plurality of high pressure fuel pumps to be made inoperative in discharging fuel to the common rail by controlling the electromagnetic valves of said some of the pumps so that the plunger rooms of said some of the pumps are communicated to a fuel feed line for feeding fuel to the plurality of the pumps when the engine is operated with small/medium fuel injection quantity of smaller than a certain quantity.

Abstract: A high volume high pressure common rail pump for a fuel system includes pairs of pump head assemblies in phase with each other but oriented in opposition to one another about a rotating cam shaft. Pump pistons in the pump head assemblies simultaneously undergo pumping strokes via a shared two lobe cam of the rotating cam shaft. The pump may include two pairs of pump head assemblies, and each head assembly may include two pump pistons. The cam shaft includes two cams sufficiently out of phase with one another that the cam shaft always has a positive torque even when the cam lobes are symmetrical. In addition, because the pumping is done simultaneously on opposite sides of the cam shaft, the forces on the cam shaft are balanced and its support bearings experience less wear and tear.

Abstract: An internal combustion engine includes an injection system that is configured as a high-pressure accumulator system in which the number of parts is small and the injection system can be easily assembled. The connecting fittings for the connection of the high-pressure lines are laterally offset with respect to the appertaining injection valves and in that the absolute magnitude of said offset is identical for all injection valves of a row of cylinders of the internal combustion engine.

Abstract: An accumulator fuel injection apparatus is provided in which average pressure in the common rail can be detected by an extremely simple and inexpensive means with increased accuracy to be used as a control signal for controlling fuel injection. A pressure detection room is formed at an end part of the accumulation chamber such that the pressure detection room is connected to the accumulation chamber of the common rail, an orifice is provided between the pressure detection room and the accumulation chamber of the common rail to communicate the pressure detection room with the accumulation chamber by a throttled sectional area, and a common rail pressure sensor for detecting fuel pressure in the accumulation chamber is attached to an end of the common rail to face the pressure detection room.

Abstract: A supercharged diesel engine having at least one charged air conduit for distributing charged air and having a first chamber for conveying the charged air. Air inlet openings of the cylinder head are connected to the first chamber in a gastight manner. The charged air conduit has at least one second chamber, which is separate from the first chamber and has a removable lid. The fuel reservoir is secured in the second chamber, which is provided with a first passage allowing the high pressure fuel line and the fuel reservoir to communicate with one another. The second chamber has at least one second passage, facing the cylinder head, allowing the fuel injection lines and fuel connections on the cylinder head to communicate with one another. With the lid in place, the second chamber encloses the fuel reservoir, the fuel injection lines and the fuel connections such that in the event of leakage at any of them, leaking fuel flows into the second chamber.

Abstract: A fuel injection apparatus having a plurality of high pressure fuel injection pumps for supplying fuel to a common rail, of which amounts of fuel discharge can be controlled by a fuel supply amount adjusting device of simple and reliable construction. The fuel supply amount adjusting device is provided to fuel feed passages for feeding fuel to the plunger rooms, the adjusting device comprising a spool valve device for varying opening area of each of passages for introducing fuel into each of the plunger rooms by sliding a spool fitted slidably in a spool valve case, a spool drive device for sliding the spool, and a controller for controlling the spool drive device so that the spool is slid to a position at which the opening area coincide with area required depending on engine operating conditions.

Abstract: A common rail supplementary atomizer of this invention, when used on a piston internal combustion engine, equipped with a common rail fuel injection system, improves slurry atomization, following injection, by expansion of gases, previously dissolved in the water phase of the slurry. This gas expansion separates the several fuel particles in each slurry droplet formed first during fuel injection. The thusly separated fuel particles subsequently burn more rapidly and completely, due to this fuel particle separation improving air access to the fuel. Apparatus is described for dissolving atomizing gas into the water phase of the slurry, in a contactor chamber at a pressure greater than the pressure prevailing in the engine cylinder volume, at the time of slurry injection.

Abstract: A fuel-injection system for an engine has a plurality of fuel-system components, including a pump, a fuel injector, and a plurality of fuel-system components connecting the pump to the fuel injector. A portion of the fuel-injection system from the pump to the fuel injector may include a first joint mating a first pair of the fuel-system components, a second joint mating a second pair of the fuel-system components, and a third joint mating a third pair of the fuel-system components. Each of the first joint, the second joint, and the third joint may include a curved surface and a corresponding seat that are mated to one another and that provide a substantially fluid-tight seal and allow variation in the angular relationship between the associated pair of fuel-system components.

Abstract: A method for detecting the opening of a passive pressure control valve, which conducts fuel from a common rail system back to a fuel tank, in which the rail pressure (pCR) is automatically controlled by calculating a correcting variable for acting on the controlled system from a rail pressure control deviation via a pressure controller, and in which, starting from a steady-state rail pressure in normal operation, a load reduction is detected when the rail pressure exceeds a first limit. Opening of the pressure control valve is detected after the first limit is exceeded if a steady-state operating state is subsequently detected again, and if a characteristic of the closed-loop control system deviates significantly from a reference value.

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: A fuel rail assembly includes a fuel injector socket having a cylindrical end for receiving an injector and a boxed end for orienting and positioning the injector relative to the engine cylinder. A boxed shape end cap is fitted over the boxed end of the socket thereby supporting the socket. Planar saddle members are disposed on each side of the end cap and radiused edges are fitted to the cylindrical surface of the fuel distribution tube. A jump tube communicates fuel from the fuel distribution tube to the fuel injector socket. A bracket defines a sole plate for the assembly, for attachment to an engine head, and includes a generally planar surface for locating against the planar surface of the saddle members. Components of the fuel rail assembly are first assembled loosely on a fixture, then joined together as the fuel rail assembly.