A valve actuation system comprises a valve actuation motion source configured to provide main and auxiliary valve actuation motions for actuating at least one engine valve via a valve actuation load path. A lost motion subtracting mechanism is arranged in a valve bridge 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 rocker arm 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 parallel with the lost motion subtracting mechanism in the valve actuation load path at least during the second activated state.

An electromagnetic valve actuator and method of control thereof. The electromagnetic valve actuator is for at least one valve of an internal combustion engine, the electromagnetic valve actuator comprising: a rotor; a stator for rotating the rotor; output means for actuating the valve in dependence on rotation of the rotor; mechanical energy storage means arranged to store energy in dependence on rotation of the rotor and release the energy to assist rotation of the rotor and phase varying means for varying a phase between the mechanical energy storage means and the output means.

An electromagnetic valve actuator and method of control thereof. The electromagnetic valve actuator is for at least one valve of an internal combustion engine, the electromagnetic valve actuator comprising: a rotor; a stator for rotating the rotor; output means for actuating the valve in dependence on rotation of the rotor; mechanical energy storage means arranged to store energy in dependence on rotation of the rotor and release the energy to assist rotation of the rotor and phase varying means for varying a phase between the mechanical energy storage means and the output means.

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 valve timing controller includes: a driving-side rotation member rotatable around a rotation axis and rotating in synchronization with a crankshaft of an internal combustion engine; a driven-side rotation member rotatable around the rotation axis and rotating integrally with a camshaft of the engine; a phase regulating mechanism setting a relative rotation phase of the driving-side and driven-side rotation members by an electric motor; a detection unit detecting the relative rotation phase; a stop control portion displacing the relative rotation phase by controlling the electric motor to stop the engine after the relative rotation phase reaches a stop phase; and a correction control portion displacing the relative rotation phase in a direction closer to the stop phase by controlling the electric motor, when the relative rotation phase is displaced beyond a set amount from the stop phase, in a state where the engine is stopped by the stop control portion.

A valve timing controller includes: a driving-side rotation member rotatable around a rotation axis and rotating in synchronization with a crankshaft of an internal combustion engine; a driven-side rotation member rotatable around the rotation axis and rotating integrally with a camshaft of the engine; a phase regulating mechanism setting a relative rotation phase of the driving-side and driven-side rotation members by an electric motor; a detection unit detecting the relative rotation phase; a stop control portion displacing the relative rotation phase by controlling the electric motor to stop the engine after the relative rotation phase reaches a stop phase; and a correction control portion displacing the relative rotation phase in a direction closer to the stop phase by controlling the electric motor, when the relative rotation phase is displaced beyond a set amount from the stop phase, in a state where the engine is stopped by the stop control portion.

An electromagnetic valve actuator (100) and method of control thereof. The electromagnetic valve actuator is for at least one valve (300) of an internal combustion engine (40), the electromagnetic valve actuator comprising: a rotor (102); a stator (101) for rotating the rotor; output means (104, 106) for actuating the valve in dependence on rotation of the rotor; mechanical energy storage means (108, 110, 116, 118) arranged to store energy in dependence on rotation of the rotor and release the energy to assist rotation of the rotor; and phase varying means (400) for varying a phase between the mechanical energy storage means and the output means.

An electromagnetic valve actuator (100) and method of control thereof. The electromagnetic valve actuator is for at least one valve (300) of an internal combustion engine (40), the electromagnetic valve actuator comprising: a rotor (102); a stator (101) for rotating the rotor; output means (104, 106) for actuating the valve in dependence on rotation of the rotor; mechanical energy storage means (108, 110, 116, 118) arranged to store energy in dependence on rotation of the rotor and release the energy to assist rotation of the rotor; and phase varying means (400) for varying a phase between the mechanical energy storage means and the output means.

A valve timing controller includes: a driving-side rotation member synchronously rotating with respect to a crankshaft of an internal combustion engine; a driven-side rotation member disposed coaxially with a rotation axis of the driving-side rotation member, and rotating integrally with a camshaft of the engine; a phase setting mechanism setting a relative rotation phase between the driving-side and driven-side rotation members; a brushless motor driving the phase setting mechanism; a control portion controlling the brushless motor by electrifying an inverter having three sets of arm portions having high-side and low-side switching elements connected to each other in series between a first power supply line and a second power supply line connected to a potential lower than a potential of the first power supply line; and a command information acquisition section acquiring holding command information indicating a command for holding a rotor of the brushless motor in a non-rotating state.

A valve timing controller includes: a driving-side rotation member rotatable around a rotation axis and rotating in synchronization with a crankshaft of an internal combustion engine; a driven-side rotation member rotatable around the rotation axis and rotating integrally with a camshaft of the engine; a phase regulating mechanism setting a relative rotation phase of the driving-side and driven-side rotation members by an electric motor; a detection unit detecting the relative rotation phase; a stop control portion displacing the relative rotation phase by controlling the electric motor to stop the engine after the relative rotation phase reaches a stop phase; and a correction control portion displacing the relative rotation phase in a direction closer to the stop phase by controlling the electric motor, when the relative rotation phase is displaced beyond a set amount from the stop phase, in a state where the engine is stopped by the stop control portion.