A diesel engine system, comprises a selectively actuated cylinder deactivation mechanism configured to lift and lower a valve and to deactivate actuation of the valve. A sleeve comprises a recesses. A controllable latch is movable between a latched condition to catch the latch in the recesses and an unlatched condition configured to collapse the latch from the recesses. A pushrod is coupled to the sleeve, the pushrod is configured to lift and lower the valve when the latch is in the latched condition. The pushrod is further configured to reciprocate inside the sleeve to deactivate actuation of the valve when the latch is in the unlatched condition.

A fully variable electro-hydraulic valve system, comprising a sliding sleeve (A103, B103), a spiral shaft (A102, B102), a piston (A105, B105), and a reset spring (A104, B104). The sliding sleeve (A103, B103) is fixed relative to an engine; the piston (A105, B105) abuts against a valve assembly (106); the spiral shaft (A102, B102) is axially controlled by a cam surface of a camshaft (101); and the spiral shaft (A102, B102) is provided with a spiral groove (A102D, B102D) and a blockage part (A102G, B102G). When the spiral groove (A102D, B102D) communicates with a limiting oil hole (A118, B118), a sliding sleeve cavity (Q) communicates with a low-pressure oil path of the engine for pressure relief.

A switching rocker arm constructed in accordance to one example of the present disclosure includes an outer arm, an inner arm, a latch, an inner roller and a first torsion spring. The outer arm has a pair of outer arm portions and a connecting arm extending therebetween. The connecting arm includes an outwardly extending tab. The inner arm is pivotally secured to the outer arm and has an outwardly extending protrusion. The latch is configured to selectively extend to engage the outwardly extending tab. The inner roller and bearing is configured on the inner arm. The first torsion spring is disposed between the outer arm and the inner arm. A first end is engaged to the connecting arm and is restrained from outward movement by the outer arm and restrained from inward movement by the outwardly extending tab. A second end is restrained by the outwardly extending protrusion.

A method for diagnosing a variable-lift camshaft follower of an internal combustion includes detecting a first knock using a spark knock sensor of the internal combustion engine; retarding ignition timing of the internal combustion engine after detecting the first knock such that the ignition timing is retarded sufficiently to ensure that spark knock is no longer possible; detecting a second knock using the spark knock sensor after retarding the ignition timing sufficiently to ensure that spark knock is no longer possible; determining that the variable-lift camshaft follower is not functioning as desired based on the second knock; and activating a malfunction alert based on the determining that the variable-lift camshaft follower is not functioning as desired.

A valve train assembly is provided for modifying a lift of at least one intake valve and/or exhaust valve. The valve train assembly includes at least one tappet that is housed in a rocker housing with at least one rocker lever. The at least one tappet is engaged to an actuator that is operable to change the tappet from a first configuration in which all cam lobe motion is imparted to the rocker lever for opening and closing the intake and/or exhaust valve, to a second configuration in which less than all motion of the cam lobe is transferred to the rocker lever.

Embodiments of the disclosure provide variable valve timing (VVT) mechanisms. A VVT mechanism according to the disclosure can include: a lever having a first end, a second end, and a fulcrum positioned therebetween; a length-adjustable push rod coupled to the first end of the lever and including an actuator therein; a rod valve coupled to the second end of the lever, the rod valve being configured to open and close an intake valve of an engine system based on a movement of the lever; and an engine control unit (ECU) operatively connected to the actuator of the length-adjustable push rod, wherein the ECU adjusts a length of the length-adjustable push rod based on an operating condition of the engine system. In addition or alternatively, the ECU can control an amount of cushioning fluid for the valves to affect the rate at which the intake valve opens or closes.

A hydraulic capsule for use in a rocker arm comprises a housing having an upper chamber that receives fluid and a lower chamber in fluid communication with the upper chamber, a pin disposed in the upper chamber and configured to be hydraulicly controlled to extend and/or retract, a check valve assembly disposed in the lower chamber and configured to selectively enable fluid communication between the upper chamber and the lower chamber based on the position of the pin, a plunger disposed in the lower chamber and configured to be hydraulicly controlled to move between an extended position and a retracted position, and a first spring coupled to the plunger and configured to bias the plunger in the retracted position. Particularly, in the retracted position, the plunger does not engage a valve bridge. In the extended position, the plunger is able to engage the valve bridge.

A variable valve lift apparatus may include an outer body, an inner body inserted in the outer body to move up and down in the outer body, a valve cylinder inserted in the outer body on a lower side of the inner body to have one side coupled to the inner body and the other side coupled to the valve, a latching member provided either to the outer body or to the inner body to be operated by a hydraulic pressure for coupling to the outer body and the inner body selectively, a hydraulic chamber formed between the outer body and the inner body, a latching flow passage formed in the outer body to supply the hydraulic pressure to the latching member, and an oil removal valve provided to drain a fluid.

In one embodiment, a valve train assembly includes a rocker arm having a cam end in proximity to a cam and a valve end opposite to the cam end and in proximity to one or more valves, an engine brake capsule coupled to the cam end, and a cylinder deactivation capsule coupled to the cam end. The engine brake capsule includes an actuation pin assembly, a check valve assembly, and a plunger, and is configured to switch between a retracted position and an extended position. The cylinder deactivation capsule includes an outer body, an inner body, and a latching mechanism, and is configured to switch between a latched position and an unlatched position. In this way, the valve train assembly may perform both engine brake and cylinder deactivation functionalities, for example, at the cam side of the valve train assembly.

In one embodiment, an engine brake capsule for use in a rocker arm is provided. The engine brake capsule includes a housing comprising a first chamber and a second chamber, an actuation pin assembly housed in the first chamber, a check ball assembly housed in the second chamber, a plunger pad comprising a channel extending through the plunger pad, and a latching assembly coupled to the plunger pad through the channel of the plunger pad. In particular, the plunger pad is at least partially housed in the second chamber and configured to be movable relative to the second chamber. The latching assembly is configured to be movable between a latched position to lock the plunger pad relative to the second chamber and an unlatched position to unlock the plunger pad from the second chamber.