Abstract: A valve train for an internal combustion engine may include a cam shaft and a cam follower. The valve train may also include a first cam arranged on the cam shaft for conjoined rotation, and a second cam for conjoined rotation, arranged on the cam shaft axially adjacent to the first cam. The cam follower may be axially adjustable between a first position, in which the cam follower is drive-connected to the first cam, and a second position, in which the cam follower is drive-connected to the second cam. The cam follower may also include a mechanical adjustment device interacting with the cam shaft for axially adjusting the cam follower between the first position and the second position.

Abstract: A valve train for an internal combustion engine may include a cam shaft and a cam follower. The valve train may also include a first cam arranged on the cam shaft for conjoined rotation. The valve train may further include a second cam arranged on the cam shaft for conjoined rotation and axially adjacent to the first cam. The cam follower may be axially adjustable between a first position, in which the cam follower is drive-connected to the first cam, and a second position, in which the cam follower is drive-connected to the second cam. The cam follower may include a mechanical adjustment device interacting with the cam shaft for axially adjusting the cam follower between the first position and the second position.

Abstract: This exhaust cam shaft (2) is provided with a shaft part (5) and cam parts (6 to 13) provided on the outer circumference of the shaft part (5). The shaft part (5) has holes (16, 17, 19) opened at predetermined positions on the outer circumferential surface of the shaft part (5). The holes (16, 17, 19) are formed so as to be gradually tapered from an outside of the shaft part (5) toward a center of the shaft part (5) in a radial direction.

Abstract: Disclosed is a control device for a multi-cylinder engine having a combustion chamber (19) to which an intake port (16) and an exhaust port (17) are connected. The control device comprises: an intake-side variable valve operating mechanism (71) for controlling a lift timing of two intake valves (21a, 21b) of the intake port (16); an exhaust-side variable valve operating mechanism (72) for controlling a lift timing of an exhaust valve (22a); and an exhaust-side valve operating mechanism (73) for driving an exhaust valve (22b) at a fixed timing. The control device is operable, when executing cylinder deactivation in a low engine load and low engine speed operating range, to cause the exhaust-side variable valve operating mechanism (72) to open the exhaust valve (22a) during downward movement of a piston (14) in a cylinder (18) being subjected to the cylinder deactivation.

Abstract: A collapsible valve bridge actuation system that is configured to alter the lift of poppet valves in a reciprocating piston machine cylinder. The system has a rocker arm configured to be actuated by a cam lobe, and a collapsible valve bridge device that is functionally attached to the rocker arm. The device has a deactivation assembly that contains lock pins within a housing and springs. Also, the device is configured to remain rigid, partially collapse, or fully collapse. The extent of collapse is a function of the strength of the springs.

Abstract: A sliding cam system for a variable valve train. The sliding cam system includes a camshaft, a cam carrier, a cam follower, and a first actuator. A first cam of the cam carrier and a second cam of the cam carrier are arranged offset with respect to one another along a longitudinal axis of the camshaft. The first cam comprises a base circle region and a valve lift region with a limiting section which adjoins the base circle region of the first cam. The second cam has a base circle region and a valve lift region with a limiting section which adjoins the base circle region of the second cam. The limiting section of the first cam and the limiting section of the second cam are of identical configuration and are arranged at an identical circumferential position about the longitudinal axis of the camshaft.

Abstract: Methods and devices are provided for locking and unlocking a phase control apparatus. In one example, a phase control apparatus is provided with a locking plate including a drive wheel, a pin recess, and a ramped channel opening into the pin recess and a housing coupled to the locking plate. The phase control apparatus also includes a vane rotor including a vane and positioned in a hydraulic chamber of the housing and a locking pin positioned within a bore of the vane and movable into a locked position where the locking pin engages with the pin recess.

Abstract: A durable system for controlling variable valve actuation of an engine valve corresponding to a cylinder of an automobile engine. The system includes first and second crowned cams having first and second lift profiles and a rocker arm assembly. The rocker assembly includes a first arm having an end connected to said engine valve, having a high impact roller following the first crowned cam operating the engine valves according to a first lift profile. The rocker arm assembly also includes a second arm having durable slider pads riding on the second crowned cam to operate said engine valve according to a second lift profile. A latch secures the second arm relative to the first arm when in a latched position causing the valve to operate according to a second lift profile. The valve operates according to a first lift profile when the latch is not in the latched position.

Abstract: A method and apparatus for diagnosing an engine system are provided. An apparatus for diagnosing an engine system including a continuous variable valve duration (CVVD) apparatus according to an exemplary embodiment of the present invention may include: an accelerator pedal position detector configured for detecting a position of an accelerator pedal; a brake pedal position detector configured for detecting a position of a brake pedal; a vehicle speed detector configured for detecting a speed of a vehicle; an intake pressure detector configured for detecting an intake pressure; and a controller configured for determining whether a fuel cut condition is satisfied and determining whether the CVVD apparatus is in a failure state when the fuel cut condition is satisfied.

Abstract: Methods and systems are provided for cylinder valves of an internal combustion engine. In one example, a valve assembly may include a poppet valve and a valve spring. The valve spring includes a plurality of legs adapted to engage with an annular groove of the valve spring in order to couple the valve spring to the poppet valve.

Abstract: In one embodiment, a method is provided. The method includes receiving a signal representative of an engine vibration transmitted via a knock sensor, wherein the knock sensor is disposed in an engine. The method additionally includes deriving a valve wear measurement during operation of the engine based on the signal. The method further includes communicating the valve wear measure.

Abstract: The setting unit sets a first target valve-opening timing to be set when a load of the internal-combustion engine is within a first range which is a predetermined range later than both a second target valve-opening timing to be set when the load is within a second range in which the load is lower than the first range, and a third target valve-opening timing to be set when the load is within a third range in which the load is higher than the first range.

Abstract: A cam phaser is disclosed including a stator, a rotor positioned in the stator and including a locking pin, and a locking cover including a receiving element for receiving the locking pin. A cover plate is arranged on an opposite side of the stator from the locking cover. A check valve plate is positioned between the stator and one of the locking cover or the cover plate and including a plurality of valve elements. A plurality of fastener openings are defined in each of the stator, the locking cover, and the check valve plate. Fasteners extend through the fastener openings. In one embodiment, a radial clearance is defined between the fastener openings in the check valve plate and the fasteners. In one embodiment, at least one axially extending boss is formed around at least one fastener opening of the fastener openings formed in the check valve plate.

Abstract: A valve drive for an internal combustion engine may include a camshaft, at least one cam follower, and at least one adjusting device. The camshaft may include at least one cam group including a first cam and a second cam. The at least one adjusting device may include a first adjustable engagement element configured to contact a first guide and a second adjustable engagement element configured to contact a second guide of a slotted guide The at least one adjusting device may further include a stop arrangement axially shiftable relative to a rocker lever shaft. The stop arrangement may include a first stop region and a second stop region. At least one of the first engagement element and the second engagement element may be adjustable via the first stop region and the second stop region, respectively, when the stop arrangement is shifted along the rocker lever shaft.

Abstract: An acting force transmission device for use with a valve mechanism of an engine includes an acting force transmission member that transmits an acting force to a valve to open/close the valve. A support shaft is provided in the acting force transmission member. An annular roller is directly mounted on an outer periphery of the support shaft. The roller is adapted to rotate when subjected to a cam force exerted by a cam and is adapted to transmit the cam force to the acting force transmission member as the acting force. A ratio d/D of an inner diameter d to an outer diameter D of the annular roller is not less than 0.7.

Abstract: An internal combustion engine includes: a crankcase that supports a crankshaft rotatably about a rotational axis; a cylinder block connected with the crankcase and including at least one pair of cylinders that sandwich a valve chamber therebetween in an axial direction of the crankshaft, the valve chamber housing therein a valve actuating mechanism that connects a camshaft to the crankshaft; a detected member disposed between crank pins corresponding to the pair of cylinders, the detected member rotating integrally with the crankshaft; and a detection sensor disposed to face a trajectory of the detected member and generating a pulse signal in accordance with movement of the detected member. Accordingly, the internal combustion engine can avoid displacement of a nearby part and enlargement of the crankcase as much as possible, while allowing the detected member to be increased in size.

Abstract: A variable valve gear for an internal combustion engine of a motor vehicle has a cam carrier which is arranged on a camshaft in a manner which prevents relative rotation and allows axial movement between a first axial position and a second axial position and has a first cam and a second cam. The first cam is designed for a normal mode of the internal combustion engine, in which the first cam keeps a first exhaust valve open in the exhaust stroke. The second cam is designed for an engine braking mode of the internal combustion engine, in which the second cam initially keeps the first exhaust valve closed in the compression stroke and/or in the exhaust stroke and opens the first exhaust valve before reaching a top dead center of a piston movement.

Abstract: In a valve timing control system, a control command unit includes: a first stage setting block and a next stage setting block. The first stage setting block sets a retard holding command value as a control command value to introduce hydraulic fluid to each retard operation chamber under a state where a rotation phase is locked, to start applying an operation pressure more than or equal to an unlock pressure to a lock component. The next stage setting block sets an advance holding command value as a control command value to introduce hydraulic fluid to each advance operation chamber, after setting the retard holding command value, to maintain the applying of the operation pressure more than or equal to the unlock pressure to the lock component.

Abstract: A head assembly for an internal combustion engine includes an electromagnetic valve actuation system. The head has an intake or exhaust passage defined therein. A valve is disposed in the passage and is operable to selectively open and close the passage. The head has a cooling passage defined therein for passage of a cooling fluid. An electromagnetic actuator has a piston in mechanical communication with the valve and a coil in fluid communication with the cooling passage. The electromagnetic actuator is operable to move the valve between a closed and an open position.

Abstract: A valvetrain for an engine includes a pair of valves that are disposed in a spaced apart relation to one another, and in which each of the valves has an elongated valve stem. The valvetrain further includes a valve bridge that is coupled to the pair of valves. The valve bridge is configured to define a pair of receptacles to at least partly receive the pair of valve stems therein. The valve bridge further defines a central recess that is located midway between the pair of receptacles and disposed in a co-planar relationship with the pair of receptacles.