Abstract: A supercharged diesel engine is equipped with an electronically controlled hydraulic system for variable actuation of the intake valves of the engine. The cam that controls each intake valve has an additional lobe for causing an additional opening of the intake valve, during the expansion and exhaust strokes, so as to provide an exhaust-gas recirculation directly inside the engine. The aforesaid additional lobe has its descending stretch radiused to the main lobe with a stretch corresponding to a non-zero lift of the valve in such a way that the profile of the lift of the valve has a portion corresponding to a substantially non-zero value of the lift that radiuses the descending stretch of the profile of the additional lift to the ascending stretch of the profile of the main lift.

Abstract: A valve timing control apparatus includes a partitioning portion in a driven-side rotary member for partitioning the fluid pressure chamber into an advance angle chamber and a retard angle chamber, a restricting member in the driven-side rotary member and projectable and retractable relative to a driving-side rotary member, a restricting recess in the driving-side rotary member and restricting a relative rotational phase to a predetermined range in association with projection of the restricting member therein, a locking member disposed in the driven-side rotary member and projectable and retractable relative to the driving-side rotary member, a locking recess formed in the driving-side rotary member and locking the relative rotational phase to the predetermined phase in association with projection of the locking member therein, a communication passage formed between the restricting member and the locking member, and an urging passage for feeding fluid for projecting the restricting member into the restricting

Abstract: A valve drive system (1) having a support element (2) and a switchable cam follower (3) that is linked on this support element in an articulated way is provided. The cam follower (3) is made from an outer lever (4) between whose arms (5) runs an inner lever (6), wherein at least the outer lever (4) is provided on its top side (7) with a contact surface (8) for a lifting cam, n the inner lever (6) has, on a bottom side (9) on a first end (10), a contact (11) for a gas-exchange valve and at least on the other end (12) two side walls (13) that are spaced apart and in which extend opposing boreholes (14). The side walls (13) are bridged by a tubular axle piece (15) that sits in the boreholes (14) and in whose opening (16) run two diametrically opposed coupling pistons (17).

Abstract: A switchable finger lever for a valve train of an internal combustion engine, said finger lever comprising an inner lever comprising on an underside on one end, a support for a gas exchange valve and on another end, a contact surface for a head of a support element, said inner lever being flanked by outer arms which are articulated for pivoting relative to the inner lever on a side of the one end, at least each of said outer arms comprising on an upper side, a cam contacting surface, said inner lever comprising directly next to the contact surface a coupling device for an optional connection of the outer arms to the inner lever, said coupling device comprising a cross-bore in which two coupling slides are arranged diametrically opposite each other, which coupling slides for effecting coupling engage partially in or under an entraining surface arranged on the respective outer arm ending in this region, and the at least one restoring spring being likewise arranged in the region of the another end while being cl

Abstract: The roller finger follower employs two independent lost motion arms and a coupling device that locks both arms. A coupling element allows for changing from locked to unlocked mode. Components of the coupling element include a shuttle pin with a head, a shank and a cutout on which a rod is positioned, a coil spring which surrounds the outside diameter of the shuttle pin shank, and an end cap. By positioning the spring on the shuttle pin shank, a large spring diameter and short spring height can be used which allows for compact packaging. Also, a low spring rate is required.

Abstract: An apparatus for controlling valve displacement of an internal combustion engine comprises a rocker arm having a first arm portion and a second arm portion, said rocker arm being pivotable about a pivot interposed between said first and second arm portions. The apparatus further comprises an actuation arrangement adapted to actuate said first arm portion of said rocker arm and a valve arrangement adapted to be actuated by said second arm portion of said rocker arm. A damper arrangement is pivotably connected to said first arm portion and adapted for damping movement of said rocker arm around said pivot.

Abstract: A valve train of an internal combustion engine with a camshaft (1) that has a carrier shaft (2) and a cam part (3) that is locked on rotation on the carrier shaft and is arranged displaceable in the axial direction and has at least one cam group (4a to 4c, 5a to 5c) of different elevations for variable actuation of a gas-exchange valve and a groove-shaped axial connecting link (10) with two connecting-link paths (11, 12) crossing its periphery, and with two actuation pins (13, 14) that can be coupled in the connecting-link paths for displacement of the cam part in the direction of the two connecting-link paths.

Abstract: An internal combustion engine is equipped with a variable valve control system which is operable to selectively actuate an engine valve using one of two cams of a camshaft, by sliding a rocker arm in the axial direction of a rocker-arm shaft. The system is capable of restricting the axial-direction movement of the rocker arm within a predetermined range, using a simple structure without unduly increasing the number of component parts. Position-restriction portions are formed in a rocker arm, and abut on a trigger arm to restrict sliding movement of the rocker arm within a predetermined amount, when the trigger arm is disengaged from the rocker arm.

Abstract: A variable valve system, may include a variable valve apparatus that controls opening/closing timing of an exhaust valve and an intake valve of an engine, and an oil supply device that supplies the variable valve apparatus with a pressured oil, wherein the exhaust valve and the intake valve may be opened/closed by rotation of a camshaft, and the oil supply device engaged with the camshaft may be operated by the rotation of the camshaft.

Abstract: An electro-hydraulic variable valve lift apparatus may include a valve unit housing of which a guide protrude portion is formed therein, a main piston which is slidably disposed in the valve unit housing and defines a valve adjusting oil chamber with the valve unit housing, a main spring which is disposed within the valve adjusting oil chamber and elastically supports the main piston on the guide protrude portion, a dependent piston which is slidably disposed within the valve unit housing, is guided along the guide protrude portion, reciprocates according to reciprocation of the main piston, and opens a valve, and a main oil supply portion which selectively supplies hydraulic pressure to the valve adjusting oil chamber.

Abstract: A system for varying actuation of a combustion valve in an internal combustion engine, including a control shaft pivot housing fixedly disposed on the engine, a control shaft pivotably disposed within the control shaft pivot housing and eccentrically fixed to a control shaft disc, an input rocker subassembly pivotably disposed on the control shaft disc and having a contact feature disposable as a follower against a camshaft lobe, an output cam subassembly pivotably disposed on the control shaft and engageable by the input rocker subassembly and including an output cam profile for engaging a finger follower of the engine, and a bias spring to urge the output cam subassembly toward the input rocker subassembly. In one aspect of the invention, high lift events with full duration are produced whenever the control shaft is aligned such that the input rocker pivot center and the output cam pivot center are coincidental.

Abstract: A continuously variable valve actuation (CVVA) system may include a driving cam firmly fixed to a crank shaft and rotated by a driving force of the crank shaft, a driven cam configured to rotatably contact the driving cam, wherein the driven cam is selectively pressed by the driving cam to rotate around one end thereof serving as a rotational axle and has a cam face at the other end thereof so as to press and open a valve when pressed, and a swing arm, one end of which is pivotally coupled to a stationary member and the other end of which is coupled to the one end of the driven cam to be rotated around the rotational axle of the swing arm.

Abstract: A rocker arm changeover device for an engine includes a major rocker arm to drive intake or exhaust valves. A driven rocker arm is arranged in line with the major rocker arm. A changeover pin is movable within a first pin hole and a second pin hole and to change between engagement and disengagement of the major and driven rocker arms. The first pin hole coaxially matches the second pin hole through rocking motions of the major and driven rocker arms. A first pin is movable within the first and second pin holes between a disengagement position at which the first pin is retracted into the first pin hole and an engagement position at which the first pin protrudes from the major rocker arm. A second pin is movable relative to and coaxially with the first pin within the first pin hole.

Abstract: A switchable cam follower of a valve train of a combustion engine, which has an external lever that encompasses an internal lever. The levers are pivotably moveable relative to one another at a valve-side end. The cam follower has a stop for a gas exchange valve on an underside on the valve-side end and a complementary face on the other end for a support element. The cam follower has a start face on an upper side for at least one high-lift cam. In one receptacle of the internal lever a coupling element is seated, which is displaceable longitudinally and can be brought into engagement in sections in case of coupling with a driving surface of the external lever. Also, at least one torsion is clamped between the two levers.

Abstract: A four-stroke internal combustion engine, having a brake controller by which pressure is built up in the exhaust system and/or at least one exhaust valve is additionally opened is provided. A hydraulic valve clearance compensation element is incorporated in at least one transmission element between the camshaft and at least one intake and exhaust valve and has at least one piston (3), a cylinder housing part (2) that interacts with the piston (3), a return spring (16) disposed therebetween, a check valve (4), and an actuatable locking device is provided which limits the movement of the piston (3) relative to the cylinder housing part (2) and/or limits the movement of the cylinder housing part (2) relative to an exterior housing (1) connected to one of the transmission elements or relative to a transmission element at least in one direction of movement, and the piston (3) is supported on a stop element (5) connected to the exterior housing (1) or the transmission element.

Abstract: In a variable valve apparatus, a second connector has a fifth side surface located below a fourth side surface and further away from a second side surface than is the fourth side surface, so that a width in a direction along a rocker shaft is narrower in a lower portion adjacent to an inlet valve than in an upper portion adjacent a slipper surface. A guide surface is provided in a lower portion of the fourth side surface and includes an arc that is shorter than a semicircle, and coaxial and equal in radius with an engaging hole. Thus, even when a connecting pin is advanced in a state of a through-hole and the engaging hole not being in precise alignment, the forward end of the connecting pin is guided through the guide surface into the engaging hole. An extended period can therefore be secured for advancing the connecting pin, to improve the certainty of connection.

Abstract: Provided is a valve operating apparatus for an internal combustion engine that, with respect to a configuration including urging means that urges a transfer member that transfers an acting force of a cam to a valve, can facilitate manufacture of a support portion of the urging means and suppress an increase in the mass of the internal combustion engine. A first rocker arm is provided that is interposed between a main cam and a valve and that transfers an acting force of the main cam to the valve. A lost motion mechanism is provided that urges the first rocker arm in one direction. A holding member is provided that holds the lost motion mechanism. The lost motion mechanism is attached to a spark plug tube through the holding member.

Abstract: An anti-rotation device (1) for a coupling piston (2) in a switchable component (3) of a valve train of an internal combustion engine is provided, with the component (3) including two parts (4, 5) that are movable relative to each other.

Abstract: An early intake valve closing (EIVC) and variable valve timing (VVT) assembly and method are provided for an internal combustion engine. The method includes operating an intake valve to open and close an intake port and allow intake gas to enter a cylinder of the internal combustion engine containing a piston, where the timing of the closing of the intake valve occurs at or before bottom dead center (BDC) of the compression stroke of the piston. The method further includes selectively extending duration of the opening of the intake port by an amount that delays closing timing of the intake valve until after BDC of the piston compression stroke. An assembly for EIVC and VVT includes a cylinder head including an intake valve and intake port and a rotatably mounted camshaft including an intake lobe operatively connected to the intake valve to periodically move the valve into the first and second positions.

Abstract: A valve train for an internal combustion engine includes a camshaft, a valve-operating cam for operating an engine valve, and a link mechanism for swinging the valve-operating cam. The valve train also includes a holder member operable to turn around the camshaft, and a drive mechanism operable to turn the holder member for varying positions of the link mechanism. The drive mechanism includes a ball screw provided perpendicularly to the camshaft, a slider threadably engaged with the ball screw, an arm member swingably attached to the slider, and a connecting bolt having one end secured to an arm-connecting portion of the arm member, and the other end secured to the holder member. In such movable valve train for an internal combustion engine, the holder member and the drive mechanism are connected to each other with a small and lightweight configuration, requiring a minimal number of parts.

Abstract: A valve plate cover/lead frame unit of a lifter oil manifold assembly used in cylinder deactivation systems to direct engine oil to valve lifters including a body including a pattern of passages that in cooperation with a pattern of passages included in the valve plate form oil galleries for distributing the engine oil, an electrical connector and an electrical lead frame terminating the electrical connector integrated into the body, and a plurality of connector terminals incorporated into the body, wherein the electrical lead frame electrically connects each of the connector terminals with the electrical connector.

Abstract: A reciprocating lever for a valve train assembly is provided, including a receiving portion and at least one retaining feature. The receiving portion is for selectively receiving a member that is actuated by the reciprocating lever. An actuation direction is also included and is defined by an actuation axis, wherein the reciprocating lever selectively actuates the member. The at least one retaining feature is located at the receiving portion of the reciprocating lever. The at least one retaining feature is configured to selectively engage with and limit relative movement of the member with respect to the reciprocating lever along the actuation axis.

Abstract: A sealing collar is provided on a body in which the body has a cylindrical wall on which a hole emerges and a fluid situated in the body is able to escape through the hole. The sealing collar includes a fixing band entirely surrounding the cylindrical wall. The fixing band has a sealing portion to sealedly obturate the hole and a means for closing and tightening the fixing band. The fixing band is provided with at least one claw extending in the direction of the cylindrical wall so that on closing and tightening of the fixing band around the cylindrical wall, the hole is sealedly obturated and the claw is pressed against the cylindrical wall and contributes to immobilizing the sealing collar on the body.

Abstract: A valve lift device for a combustion engine, a camshaft (5), a first unit (16) with a first contact device (9) in contact with a guide surface on the camshaft (5), a motion-transmitting mechanism converting the lifting movement of the unit (16) to a lift of at least one valve (3) of the combustion engine. An adjusting device (20-22) allows linear movements of the first unit (16) and hence of the first contact device (9) in a plane which is perpendicular to the camshaft's rotational axis (5a) between at least a first position of contact (9a1) with the guide surface (6) and a second position of contact (9a2) with the guide surface (6).

Abstract: An internal combustion engine is described having a valve mechanism that comprises two cams 120,122 mounted coaxially and a summation lever 124 having cam followers 126, 127 in contact with both cams so as to move in proportion to the instantaneous sum of the lifts of the respective cams. A control spring 128 is provided to maintain contact between one cam profile and its respective follower(s), and a valve actuating rocker 114 having a stationary pivot and rotatably connected to the summation lever serves to open the engine valve 110 in dependence upon the movement of the summation lever, so as to enable the valve timing, valve lift and valve event duration to be adjusted by varying the phases of the two cams.

Abstract: Systems and methods for controlling air flow in an engine including a turbocharger are provided. One example method includes adjusting valve operation for a turbocharged engine. The method may improve scavenging and reduce exhaust blow down interference.

Abstract: A valve lift mechanism may include a housing member and a plunger. The housing member may define a first annular wall including a first oil passage. An inner circumference of the first annular wall may define a first continuous region along an axial extent corresponding to the first oil passage from a first location on the inner circumference and circumferentially offset from the first oil passage to a second location on the inner circumference. The plunger may be located within the housing member within the first annular wall. The plunger may define a second annular wall including a series of apertures axially aligned with the first oil passage and separated from one another by an outer circumferential region of the second annular wall. The outer circumferential region may abut the first continuous region of the first annular wall to inhibit oil flow past the outer circumferential region.

Abstract: A split-cycle engine includes a crankshaft rotatable about a crankshaft axis. A compression piston is slidably received within a compression cylinder and operatively connected to the crankshaft such that the compression piston reciprocates through intake and compression strokes during a single rotation of the crankshaft. An expansion piston is slidably received within an expansion cylinder and operatively connected to the crankshaft such that the expansion piston reciprocates through expansion and exhaust strokes during a single rotation of the crankshaft. A crossover passage interconnects the expansion and compression cylinders. The crossover passage includes crossover compression (XovrC) and crossover expansion (XovrE) valves defining a pressure chamber therebetween. At least one of the XovrC and XovrE valves is a balanced valve.

Abstract: A V-type internal combustion engine having a variable valve train for keeping the height of the internal combustion engine low. Disclosed is a V-type internal combustion engine with a variable valve train that uses an actuator to vary the phase/lift amount of camshafts. The actuator is mounted on head covers for each of a plurality of cylinder blocks arranged in a V-shape. The actuator is attached to a lateral surface positioned opposite the offset direction of the head covers. In an embodiment, the actuator is attached to a lateral surface of the head covers and positioned close to the inside of the V banks.

Abstract: A plurality of reference signals output from a controller which computes an operation amount of an electric actuator is subjected to the logical operation, and the power supply to a drive circuit for the electric actuator is shut off based on an output by the logical operation.

Abstract: A process for starting a direct-injecting internal-combustion engine is disclosed. The process includes triggering a separate drive for adjusting the camshaft for causing an angular position change between the crankshaft and the camshaft until the separate drive rotates the crankshaft such that a working medium is compressed by a piston in a cylinder of the internal-combustion engine. The position of the pistons of the internal-combustion engine is determined by using position determining devices to identify the cylinder of the internal-combustion engine in which the working medium is compressed. Fuel is injected into the cylinder in which the working medium is compressed when the cylinder is in a proximity of an upper dead center to start the internal-combustion engine.

Abstract: In an internal combustion engine valve drive train switching arrangement with a switching unit, the switching unit has at least one actuating unit with at least two switching members and at least one switching device for actuating the two switching members independently in an at least partial chronological offset, so as to perform a first switching process based on a first signal and then a second switching process, independently of an electronic evaluation.

Abstract: An internal combustion engine with a bottom camshaft (1) and an electrohydraulic variable-lift valve actuation of a modular construction type is provided. The hydraulic unit (6) is assembled separately from the internal combustion engine and installed in or on the crankcase (10).

Abstract: In an internal combustion engine valve drive train switching arrangement with a switching unit, the switching unit includes at least two control structure arranged at adjacent ends of at least two switching devices of the actuating units and an actuating unit cooperating with at least one control track formed by the switching devices of the actuating unit.

Abstract: A method to start an internal combustion engine having a variable event valvetrain is provided. The method includes increasing the speed of said internal combustion engine during a start from a stopped position after a request to start said internal combustion engine. The method may further include increasing an intake valve lift amount, of at least a cylinder during said start while said internal combustion engine speed is increasing. The method may further include only enabling fuel flow to said cylinder when said intake valve lift amount reaches a predetermined level.

Abstract: A valve drive system of internal combustion engine which operates at a high compression ratio cycle, which is provided with an intake cam 52a and intake cam 52b for operating intake valves 7a, 7b and a variable valve timing device 70 which can offset the operating timings of the intake valves 7a, 7b by the intake cam 52a and the operating timings of the intake valves 7a, 7b by the intake cam 52b from each other. The intake cam 52a and intake cam 52b include circular parts and cam noses. At least one of the cam nose of the intake cam 52a and cam nose of the intake cam 52b has a concentric circular part which is formed in a circular shape concentric with the circular part.

Abstract: A variable tappet may include an outer tappet body, an inner tappet body that is slidably disposed within the outer tappet body and selectively connected with the outer tappet body, a lost motion elastic member that is disposed within the outer tappet body and elastically supports the outer tappet body, and a connecting unit that is slidably disposed within the inner tappet body and selectively connects the outer tappet body and the inner tappet body.

Abstract: A method and control module includes a control hold duty cycle module generating a control hold duty cycle signal and a voltage correction module generating a voltage correction signal. The control module also includes a correction module generating a corrected proportional correction signal based on a proportional correction signal and the voltage correction signal, and generating a corrected integral correction signal based on an integral correction signal and the voltage correction signal. The control module also includes a force determination module controlling a duty cycle to a phaser operator based upon the control hold signal, the corrected proportional correction signal and the corrected integral correction signal.

Abstract: A camshaft assembly may include a shaft and a lobe member fixed for rotation with the shaft. The lobe member may include a lobe extending radially outward from a base circle. The lobe may include a valve closing profile defined between a peak of the lobe and an ending point of the lobe on the base circle. The valve closing profile may define a closing flank and a closing ramp extending from an end of the closing flank to the ending point. The closing ramp may have a radial extent from the base circle at the end of the closing flank that is less than ten percent of the radial extent of the peak from the base circle and may have a first angular extent of at least ten degrees. A second angular extent defined between the peak and the ending point may be at least eighty degrees.

Abstract: A rocker arm may include a valve engagement region, a lift mechanism engagement region, a pivot region, and a body portion. The valve engagement region may be located at a first longitudinal end of the rocker arm and on a first side of the rocker arm. The lift mechanism engagement region may be located at a second longitudinal end of the rocker arm. The pivot region may be located between the valve engagement region and the lift mechanism engagement region and may define a rotational axis for the rocker arm. The body portion may extend longitudinally between and couple the valve engagement region, the pivot region and the lift mechanism engagement region to one another. The body portion may define first and second ribs on a second side of the rocker arm that extend longitudinally between the valve engagement region and the lift mechanism engagement region.

Abstract: In a turbo-charged gasoline engine the opening profile of each intake valve, defined by the opening and closing moments and by the lift, or by the opening stroke of the intake valve, is varied according to the engine operating conditions, so as to reduce or completely eliminate the intervention of a “waste-gate” valve and ensure that in each engine operating condition each cylinder processes only the quantity of air necessary for optimal combustion, with an air/gasoline dosage value close to the stoichiometric ratio.

Abstract: An improvement is disclosed for an engine valve system with variable lift and duration of the type that includes two cams mounted coaxially, a summation rocker coupled to cam followers in contact with both cams and movable in proportion to the instantaneous sum of the lifts of the respective cams, and a valve actuating rocker pivotably coupled to the summation rocker and serving to open an engine valve in dependence upon the movement of the summation rocker. In the invention, at least one of the couplings of the summation rocker with the cam followers and with the valve actuating rocker incorporates an adjustable eccentric which is rotatable to enable the clearance within the valve system to be set.

Abstract: A two mode valve lifter for Diesel engines which varies the compression ratio between higher for cold starting and other selected operating conditions, and lower for warmed-up running. This is accomplished during engine starting and selected other conditions by causing the intake valve to close early (near bottom center), providing for example, up to three ratios additional compression. The invention incorporates a conventional valve lifter packaged within a sleeve, the sleeve being moved by the engine cam. In its conventional operating mode, the sleeve is rigidly attached to the lifter and the cam moves the assembly to lift the valve in the ordinary manner. When the sleeve is not attached, partial lost motion occurs, causing the valve to open later and close earlier. In the modified mode and as needed, optional damping can be introduced to allow the valve to open and close gradually and quietly.

Abstract: A variable valve actuation system is disclosed. In one form a rocker is disclosed coupled with a valve stem at one end and a cam follower at the other end. The rocker is operable to pivot about a fixed axis. The cam follower is operable to be pivotally coupled with the rocker at one end of the cam follower. The cam follower includes a lower roller and an upper roller at its other end, each operable to engage cam lobes on separate cam shafts. In one form the cam follower includes a lower roller operable to follow a cam lobe on a lower cam shaft and an upper roller operable to follow a cam lobe on an upper cam shaft. The upper cam shaft and the lower cam shaft can have variable lobes. A spring can be used to bias the cam follower on the rocker.

Abstract: The present invention relates to a variable tappet, and the variable tappet may include an inner tappet body of which a latching member connecting hole is formed thereto, a protrude portion formed to the latching member connecting hole, an outer tappet body which is disposed around the inner tappet body and slidable to the inner tappet body and a latching member which is disposed to the outer tappet body and selectively connected to the latching member connecting hole.

Abstract: In a dual intake valve arrangement for an internal combustion engine, a variable valve lift system controls two intake valves for one or more engine cylinders. In each cylinder, one of the intake valves includes an associated two-step actuation device, and the other includes an associated valve deactivation device. To improve in-cylinder air flow turbulence, one valve may be operated in a high-lift or low-lift state while the other valve may be deactivated.

Abstract: A valve spring device is provided with a first coil spring and a second coil spring combined in series with each other. The inside diameter (coil inside diameter) of the second coil spring is greater than the outside diameter (coil outside diameter) of the first coil spring. A part of the first coil spring including an end portion along an axis is inserted into the second coil spring, thereby forming a combined spring. The end portion of the first coil spring and an end portion of the second coil spring are connected to each other by a connecting member. The first and second coil springs are compressed along the axis as they are located in series between a cylinder head and a retainer. A shaft of a valve is passed within the coil springs.

Abstract: A valve train control device, for use in a reciprocating piston internal combustion engine having a camshaft with a primary cam lobe, is provided herein and generally includes a primary cam follower positioned in an operational path between the primary cam lobe and a corresponding valve with the primary cam follower being constructed to follow the primary cam lobe while an auxiliary motion transfer device, responsive to at least one engine parameter, may be coupled to the primary cam follower to shift the primary cam follower relative to the primary cam lobe during at least a portion of the camshaft rotation to alter one or more valve operating parameters relative to a set of valve parameters defined by the primary cam lobe profile interacting with an unshifted primary cam follower.

Abstract: In an internal combustion engine valve drive switching device with a switching unit, the switching unit includes an implementation unit for implementing a first switching process based on at least one signal and thereafter, to implement a second switching process independently of an electronic evaluation.

Abstract: In an internal combustion engine valve drive train switching device, at least one safety device is provided for preventing an unscheduled switching of a valve train switching unit.