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 compression-release brake system for operating an exhaust valve of an engine during an engine braking operation. The compression-release brake system comprises a self-contained compression brake control module (CBCM) operatively coupled to the exhaust valve for controlling a lift and a phase angle thereof. The CBCM includes a casing defining an actuator cavity, a actuation piston disposed outside the casing so as to define an actuation piston cavity between the casing and the actuation piston, and a check valve provided between the actuation piston cavity and a compression brake actuator disposed in the actuator cavity. The actuation piston reciprocates relative to the casing. The compression brake actuator includes an actuator element and a biasing spring. The actuator element selectively engages the check valve when deactivated so as to unlock the actuation piston cavity and disengages from the check valve when activated so as to lock the actuation piston cavity.

A compression-release engine brake for opening an exhaust valve at an end of a compression stroke for performing braking function includes: an exhaust rocker arm, a valve bridge that is connected to a pair of exhaust valves, and of which a pair of rotation preventers protruded outward are formed the valve bridge, a socket module includes a housing in which a first space where the engine brake oil flows in and a second space where the engine brake oil is exhausted and a reset valve is disposed are formed, and the socket module whose length become longer relatively according to the inflow of the engine brake oil, and a reset guide module selectively pushing the reset valve to exhaust the engine brake oil inside the housing.

A valve actuation system comprises a valve actuation motion source configured to provide a main valve actuation motion and an auxiliary valve actuation motion for actuating at least one engine valve via a valve actuation load path. A lost motion subtracting mechanism is arranged in the valve actuation load path and configured, in a first default operating state, to convey at least the main valve actuation motion and configured, in a first activated state, to lose the main valve actuation motion and the auxiliary valve actuation motion. Additionally, a lost motion adding mechanism configured, in a second default operating state, to lose the auxiliary valve actuation motion and configured, in a second activated state, to convey the auxiliary valve actuation motion, wherein the lost motion adding mechanism is in series with the lost motion subtracting mechanism in the valve actuation load path at least during the second activated state.

A compression release type engine brake includes an exhaust rocker arm including a roller which is mounted at one end portion thereof, and the exhaust rocker arm rotating around a rocker arm shaft by the rotation of the exhaust cam, a valve bridge disposed on the other end portion of the exhaust rocker arm and connected to an exhaust valve, a brake module mounted between the exhaust rocker arm and the valve bridge, contacting with the roller and the brake cam lobe according to inflow of selectively supplied operation oil to open the exhaust valve by the exhaust cam, and the brake module including a reset valve closing operation oil inside therein, and a reset piston slidably mounted on the second end portion of the exhaust rocker arm and protruding out of the second end portion of the exhaust rocker arm according to the supply of reset oil to push the reset valve to expel the operation oil in the brake module outwards.

A system for controlling actuation of an engine valve comprises a pivot and a torsion spring having first and second legs operatively connected to the pivot. A lever arm is adjustably affixed to and extending away from the pivot, and is further rotatable about a pivot axis of the pivot between a retracted position and an extended position and vice versa relative to a motion conveying component. Furthermore, a housing is provided having a pivot bore formed therein with the pivot rotatably disposed in the pivot bore. The housing further comprises a first and second openings intersecting with the pivot bore such that the first and second legs extend out of the first opening and the lever arm extends out of the second opening. When a first force is applied by the motion conveying component to the lever arm, such first force maintains the lever arm in the extended position.

A valve actuation system comprises a valve actuation motion source configured to provide a main valve actuation motion and an auxiliary valve actuation motion for actuating at least one engine valve via a valve actuation load path. A lost motion subtracting mechanism is arranged in a pre-rocker arm valve train component and configured, in a first default operating state, to convey at least the main valve actuation motion and configured, in a first activated state, to lose the main valve actuation motion and the auxiliary valve actuation motion. Additionally, a lost motion adding mechanism is arranged in a valve bridge and configured, in a second default operating state, to lose the auxiliary valve actuation motion and configured, in a second activated state, to convey the auxiliary valve actuation motion, wherein the lost motion adding mechanism is in series with the lost motion subtracting mechanism in the valve actuation load path.

A modular exhaust valve rocker arm assembly system comprising first and second rocker arm assemblies configured to each selectively receive a hydraulic lash adjustment assembly or a mechanical lash adjustment assembly. A main lifter assembly operably associated with the first and second rocker arm assemblies. An added motion lifter assembly operably associated with the first rocker arm assembly and configured to selectively provide one of an early lift profile and an extended lift profile, which can comprise at least one of an engine braking feature, a late intake valve closing (LIVC) feature, and an early exhaust valve opening (EEVO) feature. The main lifter can be configured as a fixed lifter or as a deactivating lifter for cylinder deactivation (CDA) configured to selectively move to a deactivated state configured to absorb motion of a normal lift profile cam into lost motion.

An operating method for a driver assistance system, in particular a cruise control system of a motor vehicle. The operating method comprises determining at least one operationally relevant road property of a road on an impending route of the motor vehicle, wherein the operationally relevant road property affects operation of an internal combustion engine of the motor vehicle. The operating method comprises determining a driving recommendation in accordance with the operationally relevant road property on the impending route of the motor vehicle. The operating method comprises setting the variable valve gear in accordance with the driving recommendation determined.

A valve actuation system for an internal combustion engine The valve actuation system (S) for an internal combustion engine comprises: ⋅a rocker (6) pivotably mounted around a pivot axis (A6), comprising: ⋅a driven end portion (62) for cooperating with a rotating cam including a main bump and at least one smaller auxiliary bump; ⋅an actuating end portion (63) including a piston (8) for opening at least one valve of the engine following the cooperation of the driven end portion (62) with a bump of the cam, the piston (8) being slidably mounted relative to the rocker (6) between a extended position allowing said piston (8) to open said valve when the driven end portion (62) contacts the auxiliary bump, and a retracted position preventing said piston (8) to open said valve when the driven end portion (62) contacts the auxiliary bump; ⋅a fluid circuit for causing the piston (8) to move from its retracted position to its extended position; ⋅a reset circuit comprising a reset valve (99) rotatably mounted relative to the rocker (6), between an inactive position, and an active position in which the reset valve (99) causes the fluid to be drained out of the fluid circuit to allow the piston (8) to move towards its retracted position; ⋅a lever (7) pivotably mounted around a pivot axis (A6), the lever (7) having a driven end portion (72) adapted to cooperate with a rotating reset cam including a bump, and an actuating end portion (73) for rotating the reset valve (99) from its inactive position towards its active position following the cooperation of the lever driven end portion (72) with the bump of the reset cam; ⋅rotational coupling means (75, 95) between the lever (7) and the reset valve (99), said rotational coupling means having a transmission ratio greater than 1.