A rocker arm assembly that includes an electromagnetic latch assembly with a latch pin and an actuator operative to actuate the latch pin between a first position and a second position. The actuator includes an electromagnet powered through a coil circuit. The rocker arm assembly further includes a switch in a switch circuit. The coil circuit and the switch circuit are connected in parallel. Moving the latch pin between the first position and the second position opens and closes the switch. In an alternate embodiment, relative motion of two rocker arms opens and closes the switch. The rocker arm assembly allows OBD information to be obtained without making electrical connections to the rocker arm assembly other than ones provided to power the electromagnet.

A hydraulic fluid control valve (HFCV) configured to recirculate an exiting hydraulic fluid from a first hydraulic actuation chamber to a second hydraulic actuation chamber is provided. The HFCV includes a selectively movable spool having an outer annulus configured to receive and deliver the exiting hydraulic fluid to one or both of either a sump or one of the first or second hydraulic actuation chambers.

A check valve part includes: a valve seat hole into which hydraulic oil flows; a valve seat formed around the valve seat hole; a lateral hole formed to have an axis intersecting an axis of the valve seat hole; and a valve body provided so as to be separated from the valve seat or abutted against the valve seat. The valve timing adjustment device further includes a back pressure oil passage that communicates a space opposite to the valve seat with respect to the valve body with the lateral hole.

An internal combustion engine includes an electro-hydraulic system for variable actuation of intake valves where each cylinder has two intake valves, associated with two intake conduits. A first conduit is generates within the cylinder a tumble motion of airflow introduced therein, when the intake valve associated thereto is at least partially opened. The second intake conduit generates within the cylinder a swirl motion of airflow introduced therein when the second intake valve is at least partially opened. A controller of controls one or more control valves to open only one of the intake valves of each cylinder in a condition of reduced engine operation, below a predetermined load and/or a predetermined speed of the engine, and to always open both intake valves in the remaining conditions of engine operation. The first intake valve is the only valve to be opened in the reduced engine operation condition.

A hydraulic capsule can comprise a hollow capsule body for setting the location of a plunger, a latch set alignable with a latch groove, and a latch-setting insert. The plunger can be configured to push the latch set towards the latch-setting insert. A lost motion spring can be incorporated into the hydraulic capsule, or the lost motion spring can be installed in capsule bore where the hydraulic capsule is mounted. Either a hydraulic capsule or an electromagnetic capsule or a drop in assembly can be installed in a capsule mount in a rocker arm to form a type III cam-actuated rocker arm. The rocker arm can comprise a cam side arm and a valve side arm. The rocker arm can be configured to balance a moment of inertia of the deactivation components. Twisting forces on the cam can be counteracted.

The invention relates to a variable valve train for switching an outlet valve of an internal combustion engine to an engine braking mode. The variable valve train has a camshaft with a first cam, which is designed as a normal operation cam, and a second cam, which is designed as an engine braking cam. A first rocking lever has a first stroke device which is designed for selectively making or breaking a first operative connection between the first cam and the outlet valve by means of the first rocking lever. A second rocking lever has a second stroke device which is designed for selectively making or breaking a second operative connection between the second cam and the outlet valve by means of the second rocking lever. A valve device selectively connects the first stroke device or the second stroke device to a fluid feed line.

A hydraulic fluid control valve (HFCV) configured to recirculate an exiting hydraulic fluid from a first hydraulic actuation chamber to a second hydraulic actuation chamber is provided. The HFCV includes a selectively movable spool having an outer annulus configured to receive and deliver the exiting hydraulic fluid to one or both of either a sump or one of the first or second hydraulic actuation chambers.

An actuator control system suitable for providing single wire control of electromagnetic latch assemblies providing for cylinder deactivation or variable valve actuation in a valvetrain system. The system is adapted to control electromagnetic latch assemblies that require DC current in a first direction for latching and DC current in a reverse of the first direction for unlatching. The actuator control system includes an inverting DC/DC converter and switching elements. In some embodiments, the inverting DC/DC converter uses capacitors to store energy that drives the inverted current. In some embodiments, the inverting DC/DC converter serves a plurality of distinct groups of the electromagnets.

The disclosure relates to a preassembled module of a variable-lift valve train for an internal combustion engine. The module includes an electric linear actuator that lies on a top side of a base plate of the module. A slide plate, movable by the electric linear actuator by means of a linear guide, also lies on the top side of the base plate. A retaining wall extends under a bottom side of the base plate and has two actuation fingers. A free end of each actuation finger includes a contact surface for moving a coupling slide of a switchable rocker arm. In a region of an outer transverse side of the slide plate, a contact wall arranged in front of the electric linear actuator extends upward. The contact wall contacts an actuation pin of the electric linear actuator to move the slide plate in a longitudinal direction.

An electromagnetic actuator having at least one electromagnetic actuator unit, the actuator unit comprising a coil and a plunger, which plunger is axially movable relative to the coil via energization of the coil, and the actuator unit being arranged in a housing. In order to achieve a particularly simple design, the plunger is arranged approximately coaxially with the coil according to the invention.