Abstract: The invention relates to a pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, comprising at least one cylinder (14), a piston (15) which is displaceably arranged in the cylinder (14), and a pressure valve (30) for selectively controlling the supply of fuel to the internal combustion engine, wherein the pressure valve (30) has a closure part (38, 46, 51) provided with a cavity (44, 49, 53) that opens to the outside on an end surface (43, 48, 52) facing the piston (15) of the closure part (38, 46, 51).

Abstract: The invention relates to a high-pressure pump (1), in particular for a motor vehicle, for conveying a fluid, in particular fuel, e.g. diesel fuel, comprising a drive shaft having at least one cam, at least one piston, at least one cylinder (6) for mounting the at least one cam, wherein the at least one piston is supported on the drive shaft by the at least one cam, so that a translational motion can be carried out by the at least one cam as a result of a rotary motion of the drive shaft, at least one cover cap (8), which is attached indirectly or directly to the outside of the cylinder (6), wherein one end (18) of the at least one cover cap (8) rests on a projection (16) of the remaining high-pressure pump (1) for the interlocking attachment of the end (18) of the cover cap (8) to the projection (16).

Abstract: A system for performing a medical procedure includes an articulating probe including inner and outer sleeves, and a surgical tool including a functional element positioned at a distal end of a tool shaft, the tool shaft having an articulation region. The articulating probe and the surgical tool are independently controllable.

Abstract: A supply pump includes a housing that has a tappet receiving chamber, which receives a plunger drive mechanism, and oil for lubricating respective lubricating portions of the plunger drive mechanism is temporarily retained in the tappet receiving chamber. In the housing, a communication hole opens in an inner peripheral wall surface of a tappet guide and guides the oil from a tappet upper side chamber into a tappet lower side chamber at the time of upwardly moving a tappet.

Abstract: An overhead-camshaft internal combustion engine is disclosed, in which the fuel pumps are arranged to use efficiently the space within a cylinder head assembly of the engine. The cylinder head assembly includes a cylinder head block, and the engine comprises a camshaft rotatable about a camshaft axis and having a plurality of inlet and exhaust cams for actuating associated inlet and exhaust valves of the engine, and at least one fuel pump comprising a unit pump assembly driven directly by a respective pump cam provided on the camshaft. The engine further comprises a plurality of rocker arms driven by the inlet and exhaust cams and arranged to actuate the inlet and exhaust valves. Each rocker arm is pivotable about a rocker arm axis which is substantially parallel to the camshaft axis. The or each pump assembly is mounted between the rocker arm axis and the cylinder head block.

Abstract: A fuel pump and method for draining such and for providing a lubrication fluid sump level for startup of the fuel pump are disclosed. The fuel pump may comprise a housing, a first plunger apparatus, and a camshaft rotatably mounted in the housing. The camshaft has a first end and a second end and may define a bore extending from the first end to the second end. The camshaft may include a first interface operatively connected to the first plunger apparatus.

Abstract: A tappet support member includes at least two slide surfaces and at least two press-fitting projections. The at least two slide surfaces, are planar and extend in an axial direction of a plunger. The at least two slide surfaces are substantially parallel to each other and are opposed to each other, and a shoe of a tappet is axially reciprocatably supported by the at least two slide surfaces. Each of the at least two press-fitting projections projects from a corresponding side of the tappet support member that is opposite from a corresponding one of the at least two slide surfaces, and each of the at least two press-fitting projections is press-fitted into a pump housing, which is stationary relative to the tappet.

Abstract: A method for improving startability of a of a gasoline direct injection (GDI) engine by controlling an electric continuously variable valve timing (CVVT) may include determining whether the engine is running, calculating the phase angle of the camshaft and the difference between the position of the camshaft and the optimum position of the lobe of the high pressure pump, applying a duty to the drive motor to rotate the camshaft, calculating the difference between the current position of the camshaft after rotation and the target position of the camshaft, and comparing the difference with a predetermined value. When the difference is not smaller than a predetermined value, the duty is raised and applied to the drive motor to rotate the camshaft further until the difference is reduced and smaller than the predetermined value.

Abstract: The fuel pump driving structure includes a camshaft and a pump cam member. The camshaft is rotatably supported at an end by a cylinder head. The pump cam member has a fitting hole into which the end of the camshaft is press fitted, and is operatively coupled to a high-pressure fuel pump. The pump cam member includes a pump cam section and a first contact section. The pump cam section has a first lift portion operating the high-pressure fuel pump, and a base circular portion that does not operate the high-pressure fuel pump. The first contact section is in a position offset from a position of the first lift portion with respect to a circumferential direction and contacting a portion of the camshaft in an axial direction at a position radially outward of an external circumferential surface of the one end of the camshaft.

Abstract: A method of assembling a fuel pump on an engine is disclosed. The method includes a timing pin installed between a pump flange of the fuel pump and a flywheel housing of the engine. The pump flange is moved towards the flywheel housing. The timing pin is further removed which is installed between the pump flange and the flywheel housing of the engine. Further, the pump flange is abutted with the flywheel housing of the engine.

Abstract: A tappet support member includes at least two slide surfaces and at least two press-fitting projections. The at least two slide surfaces, are planar and extend in an axial direction of a plunger. The at least two slide surfaces are substantially parallel to each other and are opposed to each other, and a shoe of a tappet is axially reciprocatably supported by the at least two slide surfaces. Each of the at least two press-fitting projections projects from a corresponding side of the tappet support member that is opposite from a corresponding one of the at least two slide surfaces, and each of the at least two press-fitting projections is press-fitted into a pump housing, which is stationary relative to the tappet.

Abstract: In control executed by a fuel supply apparatus having a delivery passage that delivers fuel to a fuel injection valve, a fuel pump that pumps the fuel from a fuel tank to the delivery passage, and a check valve that allows the fuel to flow out of the delivery passage into the fuel tank, that opens when a first fuel pressure on the delivery passage is higher than a second fuel pressure on the fuel tank by at least a set pressure, when the first fuel pressure is lower than a lower limit pressure being higher than the set pressure in a case where fuel injection is to be stopped, the fuel pump is controlled so that the first fuel pressure rises to or above the lower limit pressure, and after the first fuel pressure has reached or exceeded the lower limit pressure, the abnormality diagnosis is executed on the check valve.

Abstract: A timing transmission mechanism (T2) in an engine is formed of a chain transmission system (C) that is formed from a drive sprocket (20) mounted on a crankshaft (4), a driven sprocket (25) mounted on a pump input shaft (24) of a high pressure fuel pump (P), and a chain (22) wound around the drive sprocket (20) and the driven sprocket (25); and a gear transmission system (G) that is formed from a drive gear (26) mounted on the pump input shaft (24) coaxially with the driven sprocket (25) and a driven gear (27) mounted on a camshaft (13b) and meshing with the drive gear (26). This enables a timing transmission mechanism to be provided that can increase the degree of freedom in layout of the high pressure fuel pump without causing any increase in the number of components, the weight, or the backlash.

Abstract: An example lubricant supply device for an auxiliary machine of an engine includes a cam formed at one end of a cam shaft rotatably supported by a cylinder head. The lubricant supply device further includes a housing, for storing the auxiliary machine, attached to an attaching surface formed at an end of the cylinder head. The housing may hold a driven member driven by the cam. The lubricant supply device may further include a lubricant hole formed on the attaching surface through which lubricant is supplied from a lubricant passage formed in the cylinder head to the cam storage space. The lubricant supply device may further include a metal gasket positioned between the attaching surface and the housing to seal the cam storage space and outside. The metal gasket has a hole for communicating with the lubricant hole and a slit communicating between the hole and the cam storage space.

Abstract: A fluid pump is disclosed. The fluid pump may comprise a housing, a tapered bearing, a drive shaft, a first fluid chamber, and a second fluid chamber. The housing defines a bore. The tapered bearing is received within the bore of the housing. The drive shaft is received within the tapered bearing. The first fluid chamber is defined between the housing and the drive shaft on a first side of the tapered bearing. The second fluid chamber is defined between the housing and the drive shaft on a second side of the tapered bearing. The second fluid chamber is separated from the first fluid chamber by the tapered bearing. The housing includes a fluid passage fluidly coupling the first fluid chamber and the second fluid chamber.

Abstract: An internal combustion engine has a fuel supply system which has a fuel pump driving mechanism that limits the relative motion between a part of the mechanism contacting a plunger of the pump and the plunger.

Abstract: There is provided a high pressure fuel pump control system for an internal combustion engine which enables fuel pressure control with high precision without being restricted by the number of cylinders of the internal combustion engine or the number of phase sensor signals and the number of cam noses which vertically drives a plunger of a high pressure fuel pump even when a camshaft phase varies by a variable valve timing mechanism by using the high pressure fuel pump with a solenoid valve. The control system has a means which changes an effective stroke by driving the solenoid valve in the high pressure fuel pump, and has a means which changes the drive timing of the high pressure fuel pump based on a cylinder recognition value of the internal combustion engine with the cam angle detecting means as an origin.

Abstract: A lubrication system for a fuel pump of an engine, may include at least one oil supply hole formed radially in a journal of a camshaft, an oil channel formed in a cam cap rotatably connected to the journal of the camshaft and selectively communicating with the at least one oil supply hole, a nozzle formed in the cam cap and being in fluid connection with the oil channel to inject oil to a contact portion between a pump-driving cam of the camshaft and an operational member of the fuel pump driven by the pump-driving cam, and a fluid communication control member selectively connecting the oil channel and the at least one oil supply hole in accordance with rotation of the camshaft.

Abstract: A fuel pump lubrication apparatus for lubricating a fuel pump including a tappet and the fuel pump operating the tappet, may have a cylinder head including an oil gallery wherein a camshaft is disposed, an oil supply line communicated to the oil gallery, a lubrication cam cap slidably encompassing the camshaft, and a cam cap oil hole formed in the lubrication cam cap and ejecting oil received from the oil supply line to a contacting portion between the pump cam and a plunger of the fuel pump.

Abstract: A piston pump, especially for supplying high-pressure fuel to a direct-injection internal combustion engine, including a pump housing (2) and a drive shaft (3a to 3i) for actuating one or several pump plungers (5) which are radially oriented relative to the drive shaft in the pump housing. The drive shaft is rotatably mounted on one or several bearings (11, 31, 49) extending between a shaft inlet (15) of the pump housing and a rear housing wall (20) located opposite the shaft inlet. One bearing (11) extends between an internal surface (17) of a hollow cylindrical section (10) of the drive shaft and an external surface (18) of a journal (19) that runs from the rear housing wall into the hollow cylindrical section.

Abstract: In a conventional high-pressure fuel pump, the interference fit part between a plunger and a retainer comes loose with time due to environmental factors and this reduces the clearance between the retainer and a tappet more than necessity, resulting in increase in the contact face pressure between the plunger and a cylinder when a side force acts on the plunger, which causes seizure between the plunger and the cylinder. In this invention, a protrusion protruding toward the tappet is provided around the through-hole for press-fitting the plunger, the through-hole provided in the center portion of the retainer. Since the clearance between the retainer and the tappet can sufficiently be kept even if the joint between the retainer and the plunger comes loose, the seizure between the plunger and the cylinder and the breakage of the plunger are less likely to occur even if the side force acts on the retainer.

Abstract: A control system of an internal combustion engine changing an operating timing of a valve in an internal combustion engine where a valve drive cam (13) and a pump drive cam (150) are both provided on a valve camshaft (1) is provided. That control system has a device inhibiting the operating timing from being returned in a direction reverse to the direction of the target operating timing during change of the operating timing. Further, in the control system, the relative rotational phases of the valve drive cam and the pump drive cam are set considering utilization of the composite reaction torque of the valve operation drive reaction torque and the fuel pump drive reaction torque acting on the valve camshaft for changing the operating timing in the direction of the target operating timing.

Abstract: A lubrication apparatus of a fuel pump driven by a fuel pump drive cam, which lubricates a tappet moving reciprocally at an interior circumference of a fuel pump adaptor and the fuel pump operating the tappet, may include a fuel pump adaptor lubrication passage formed in the fuel pump adaptor and communicating with an oil gallery formed inside a cylinder head so as to supply oil in the fuel pump adaptor.

Abstract: A fuel pumping system comprises a high pressure pump having a drive input, a drive gear driven for rotation, in use, by the drive input, an idler gear driven by the drive gear, and an output gear driven by the idler gear, wherein the output gear is arranged to drive a rotor of an electrical generator and the idler gear is arranged to drive a rotor of a low pressure pump.

Abstract: A lubrication apparatus of a fuel pump, which lubricates a tappet and a fuel pump drive cam of the fuel pump, may include a cylinder head having an oil gallery formed therein and a camshaft disposed therethrough, wherein the fuel pump is coupled to the cylinder head, and a penetrating passage penetrating the cylinder head and connected to the oil gallery to supply oil from the oil gallery to the inside of a fuel pump adaptor connected to the fuel pump.

Abstract: A lubrication apparatus of a fuel pump driven by a fuel pump drive cam, which lubricates a tappet moving reciprocally at an interior circumference of a fuel pump adaptor and the fuel pump operating the tappet, may include a cylinder head provided with a camshaft, an oil supplying passage formed in the camshaft as a hollow type so as to take oil to the interior of the camshaft, at least an oil branch passage formed to a cam lobe of the fuel pump drive cam so as to be communicated with the oil supplying passage, and a circular groove formed at the interior circumference of the fuel pump adaptor and corresponding to an injection direction of the oil supplied from the at least an oil branch passage.

Abstract: A high pressure pumping apparatus for of an internal combustion engine includes a pump barrel having a bore with a central axis, and a two-part pumping plunger provided in the bore of the barrel. The two-part plunger includes first and second pumping plunger parts that are separate from one another and arranged substantially coaxial with the central axis of the barrel's bore. A first distal end portion of the first pumping plunger part abuts a first distal end portion of the second pumping plunger part, and a second distal end portion of the first pumping plunger part in part defines a pumping chamber. The high pressure pumping apparatus includes and a tappet assembly that is operably coupled to the second distal end portion of the second pumping plunger part for operably engaging a rotating camshaft, which causes the first and second plunger parts to move in reciprocal motion.

Abstract: A timing transmission mechanism (T2) in an engine is formed of a chain transmission system (C) that is formed from a drive sprocket (20) mounted on a crankshaft (4), a driven sprocket (25) mounted on a pump input shaft (24) of a high pressure fuel pump (P), and a chain (22) wound around the drive sprocket (20) and the driven sprocket (25); and a gear transmission system (G) that is formed from a drive gear (26) mounted on the pump input shaft (24) coaxially with the driven sprocket (25) and a driven gear (27) mounted on a camshaft (13b) and meshing with the drive gear (26). This enables a timing transmission mechanism to be provided that can increase the degree of freedom in layout of the high pressure fuel pump without causing any increase in the number of components, the weight, or the backlash.

Abstract: An engine control system comprises a camshaft, a cam phaser module, a pressure sensor, and an engine control module. The camshaft is operably coupled to a crankshaft of an engine. Rotation of the camshaft operates a fuel pump in driving communication with a cam of the camshaft. The cam phaser module provides hydraulic pressure to change a rotational position of the cam about the camshaft. The pressure sensor determines a cam phaser pressure signal based on a pressure of fluid in the cam phaser module. The engine control module diagnoses a condition of the fuel pump based on the cam phaser pressure signal.

Abstract: A fuel pump set includes a cam shaft with a cam; a bridge contacting the cam shaft; a head cover attaching the bridge to the cam shaft; and a fuel pump, disposed in the bridge and operable by the cam. The bridge may include two supports, each contacting the cam shaft. One support may have a supporting face, with a shape corresponding to the shape of the cam shaft, with the cam shaft disposed therein. The two supports together may define a shape that widens downward. One support may narrow downward. The set may also include a rod extending from the fuel pump to the cam, reciprocated by the cam. The bridge may include a sealing face supported by the head cover, a groove for preventing rotation of the fuel pump, and/or a breather. The head cover may include an opening in which the fuel pump is disposed.

Abstract: An engine control system comprises a camshaft, a cam phaser module, a pressure sensor, and an engine control module. The camshaft is operably coupled to a crankshaft of an engine. Rotation of the camshaft operates a fuel pump in driving communication with a cam of the camshaft. The cam phaser module provides hydraulic pressure to change a rotational position of the cam about the camshaft. The pressure sensor determines a cam phaser pressure signal based on a pressure of fluid in the cam phaser module. The engine control module diagnoses a condition of the fuel pump based on the cam phaser pressure signal.

Abstract: A motorcycle mounted with a V-shaped engine in which a front bank and a rear bank are disposed like a V-shape and a fuel pump for fuel injection is mounted. The fuel pump is driven by a camshaft of a cylinder head, and mounted on the upside of the cylinder head. The fuel pump is fitted is the cylinder head of the front bank at the back of a head pipe. A fuel chamber is provided between the fuel pump an the injectors, the fuel chamber is disposed lengthways in the vertical direction in the V-bank space K, and a lower end part is disposed facing the sides of the injectors, and connection to the injectors by fuel pipes extending from the lower end part substantially horizontally. With this configuration, the fuel pump does not obstruct other components in the motorcycle, and is protected without a special cover.

Abstract: A fuel-pump-driving device (20) drives a plunger (31) of a fuel pump (30) to perform a reciprocating motion to supply fuel to an internal combustion engine. The fuel-pump-driving device (20) comprises a cam (27) that drives the plunger (31) according to the rotation of a fuel-pump-driving sprocket (26). The fuel-pump-driving sprocket (26) meshes with a chain (7A) which travels between a crank sprocket (3) and a valve-driving sprocket (5A) of the engine. Since the fuel-pump-driving sprocket (26) can be located in a position detached from the valve-driving sprocket (5A), the fuel-pump-driving device (20) has greater freedom of layout and the fuel pump (30) exhibits a better performance than in a case where the plunger (31) is driven by a cam that is fixed directly to the cam shaft (5) of the valve-driving sprocket (5A).

Abstract: A control device for a high-pressure fuel pump for an internal combustion engine having a solenoid valve installed as a suction valve in a fuel charging passage to a pressurized chamber. A pump suction pressure generated in the pressurized chamber in the charging stroke is exerted on the solenoid valve in a valve opening direction. The solenoid valve is closed at OFF state of an electric driving signal and opened at ON state of the electric driving signal, so that a discharging rate of the high-pressure fuel pump of variable discharge rate type is controlled by an opening and closing control of the solenoid valve.

Abstract: A high-pressure fuel pump of an internal combustion engine has a fuel injection valve provided on a cylinder. The high-pressure fuel pump is for pumping fuel to the fuel injection valve, and has a pressure chamber, a plunger for pressurizing the fuel in the pressure chamber, a fuel valve provided in the pressure chamber, and an actuator for operating the fuel valve. A control device has means for calculating the drive signal of the actuator so as to realize the variable discharge of the high-pressure fuel pump. The end timing of the drive signal is limited or restricted so that an attraction force of a solenoid coil is not maintained at the bottom dead center of the plunger in case that the required discharge to the fuel pump is less than the total discharge.

Abstract: In a gearwheel mechanism for driving a secondary unit such as a fuel pump driven via the gear wheel mechanism by a primary unit, a driven gear mounted on the secondary unit is provided with a positioning element including sections covering teeth areas of the driven gear so that those sections cannot be engaged with a driving gear of the primary unit during mounting of the secondary unit, and in a pump having a gear provided with such a positioning element as wells as an internal combustion engine including a pump with a gear provided with a positioning element.

Abstract: There is provided a control apparatus for a cylinder injection internal combustion engine which suppresses fuel pulsation caused by cam phase deviation and thereby prevents internal combustion engine exhaust deterioration, so that the reliability of a high-pressure fuel system using a high-pressure fuel pump is improved. The control apparatus for a cylinder injection internal combustion engine includes a high-pressure fuel pump that raises the pressure of fuel and discharges the fuel to a fuel rail, and a fuel pressure sensor that detects a pressure of fuel stored in the fuel rail. The control apparatus controls the high-pressure fuel pump based on the fuel pressure detected by the fuel pressure sensor.

Abstract: A radial piston pump with a roller tappet in which the service life of the tappet is increased by delivering fuel to the contact faces between the tappet and the roller by way of a hydraulic connection between the tappet chamber and the engine chamber.

Abstract: A fuel pump drive system is provided. A system for an engine driven by an engine crankshaft may include a first variable cam device including a first hydraulic actuator, and a second variable cam device including a second hydraulic actuator. The system may further include an intermediate power transfer mechanism coupled between the first variable cam device and the second variable cam device upstream, in a direction of power flow from the engine crankshaft, of the first hydraulic actuator and the second hydraulic actuator. The system may further include an auxiliary device coupled to and driven by the intermediate power transfer mechanism. In this way, because the auxiliary device is driven via the intermediate power transfer mechanism and thus derives its power from upstream of the hydraulic actuator of the variable cam device, the actuator can be adjusted without having to overcome resistance torque of the auxiliary device.

Abstract: The invention relates to a high pressure fuel pump for a fuel injection system of an internal combustion engine, having a pump housing in which is formed a working space, into which fuel can be supplied from a low pressure region of the radial piston pump, the working space being delimited by a pump piston which can be driven, in order to pressurize the fuel, by an external drive, in particular by a camshaft of an internal combustion engine, wherein in order to meter the fuel quantity supplied to the working space, a throttle device having a variable throttle action is arranged on or in the pump housing.

Abstract: The invention relates to a high-pressure pump, especially for delivering fuel for a common rail fuel injection system. The pump includes at least one cam drive having a feeler element which can be set moving in direction of a stroke axis by a cam geometry introduced into the camshaft, the stroke movement being transmittable to a plunger unit. The plunger unit and the feeler element are impinged upon with a force by a compression spring element in the direction of the cam geometry and the plunger unit has at least one contact surface which adjoins the compression spring element. The at least one contact surface and/or the surface of the compression spring element adjoining the same has a friction-reduced surface coating to bring about a torsion decoupling of the compression spring element.

Abstract: The invention provides for operation of camshafts, particularly for an injection pump for diesel. A camshaft rotates around a longitudinal axis of a camshaft. The camshaft has at least one cam being in cooperation with a pressure roller driven in a lifting manner. The pressure roller rotates on the peripheral surface of the cam. The upward stroke of the pressure roller is a working stroke during which the pressure roller moves away from the longitudinal axis of the camshaft. During a return stroke the pressure roller moves toward the longitudinal axis of the camshaft. The peripheral surface of the cam has a return stroke section and a working stroke section. The peripheral surface of the return stoke section has a greater friction value than the working stroke section. Thus an operation of camshafts for an injection pump for diesel is provided, securing a rotation of the pressure roller around the circumference of the cam within the whole speed range of the camshaft.

Abstract: The invention relates to a tappet assembly for a high-pressure pump, especially for the prose of fuel supply, and to a high-pressure pump including such a tappet assembly. The tappet assembly has a hollow cylindrical tappet base into which a roller support is inserted in the direction of the longitudinal axis of the tappet base. A roller is rotatably received in the roller support. The roller support is arranged at a right angle to the rotational axis of the roller with little or no play in the tappet base and in the direction of the rotational axis of the roller with larger play than at a right angle to the rotational axis of the roller in the tappet base.

Abstract: A vehicle includes a direct-start engine and a fuel rail with a threshold fuel pressure, a transmission having a threshold fluid pressure, and a fuel delivery system. The system has a controller, a motor having a shaft, and an integrated pump assembly including a high-pressure (HP) fuel pump and a low-pressure (LP) fluid pump each connected to the shaft. Threshold pressures are maintained during the predetermined engine state, which includes an engine idling and an engine cranking state. A method for providing stop-and-go functionality in a vehicle having a direct-start engine includes detecting a current engine state, rotating a motor shaft to energize a secondary HP fuel pump at a first threshold pressure during engine cranking, and rotating the shaft to energize an LP fluid pump at a second threshold pressure during engine idling and engine cranking. The secondary pumps can also be used when primary pumps are temporarily inoperable.

Abstract: A fuel injector assembly for an emissions-based EMD 710 locomotive dieselengine. The fuel injector assembly includes a needle slidably positioned within a bore of a valve body of the injector assembly, where fuel pressure introduced into a bore chamber causes the needle to open a spray tip. A spring mounted within the bore forces the needle to close the spray tip when the fuel is not being applied. The spring is a dead coil spring including inactive coils where at least portions of the coils at both ends of the spring are in intimate contact with each other so as to reduce spring wear during operation of the assembly. Because the dead coil spring has reduced wear, the VOP set point of the fuel injector assembly can be reduced, which reduces NOx emissions.

Abstract: In a fuel-pumping system in an internal combustion engine, a mechanical fuel pump roller actuator is slidably disposed to ride on a dedicated tri-lobate camshaft lobe. In prior art camshaft lobes for this purpose, a portion of the lift profile over a certain angle of camshaft rotation imparts a constant velocity, and hence zero acceleration and zero jerk, to the roller actuator. It has been found that such areas of zero acceleration give rise to undesirably high contact stress between the lobe and the roller actuator. In a method in accordance with the present invention, a reference radius of curvature of a reference camshaft lobe lift profile is adjusted such that, between regions of minimum lift and maximum lift, there are no regions imparting zero acceleration to the actuator and maximum contact stress is reduced.

Abstract: The present invention reduces exhaust emissions at startup, provides improved fuel pressure control performance in a low-load region, and detects high-pressure fuel system abnormalities. Disclosed is a high-pressure fuel system control device which includes a high-pressure pump for pressurizing fuel and discharging the pressurized fuel to a fuel rail, an injector for injecting the fuel stored in the fuel rail, and a fuel pressure sensor for measuring the pressure of the fuel stored in the fuel rail, and controls the high-pressure pump and the injector in accordance with an output generated from the fuel pressure sensor.

Abstract: A fuel pump for a direct injection internal combustion engine having a body with a valve seat. The valve includes a valve head and the valve is movably mounted to the body between an open position and a closed position. In its open position, the valve head is spaced from the valve seat white in its closed position, the valve head abuts against the valve seat and closes the valve. An electric coil upon energization moves the valve to an open position and, conversely, upon deenergization allows the valve to move to a closed position. A control circuit controls the energization of the coil to reduce the pump noise during operation of the engine, especially at low speeds.

Abstract: A fuel pump set includes a cam shaft with a cam; a bridge contacting the cam shaft; a head cover attaching the bridge to the cam shaft; and a fuel pump, disposed in the bridge and operable by the cam. The bridge may include two supports, each contacting the cam shaft. One support may have a supporting face, with a shape corresponding to the shape of the cam shaft, with the cam shaft disposed therein. The two supports together may define a shape that widens downward. One support may narrow downward. The set may also include a rod extending from the fuel pump to the cam, reciprocated by the cam. The bridge may include a sealing face supported by the head cover, a groove for preventing rotation of the fuel pump, and/or a breather. The head cover may include an opening in which the fuel pump is disposed.

Abstract: A fuel pump for an automotive application includes two separate pumping chambers within each of which a piston is reciprocated in order to pump fuel to an engine for the automobile. The dual cylinder arrangement increases the output capacity of the fuel pump.