Valve actuation system for providing valve actuation motions for late/early intake valve closing and internal EGR

A valve actuation system for actuating at least one intake engine valve, the valve actuation system comprising:

• a first motion transfer mechanism operatively connected to a first valve actuation motion source and to the at least one intake engine valve, wherein the first valve actuation motion source provides at least an early intake valve closing (EIVC) valve actuation motion;
• a second motion transfer mechanism operatively connected to a second valve actuation motion source, wherein the second valve actuation motion source is configured to provide at least a main valve actuation motion and an internal exhaust gas recirculation (IEGR) valve actuation motion;
• and
• a selectable coupling mechanism disposed between the first motion transfer mechanism and the second motion transfer mechanism,
• wherein, when the selectable coupling mechanism is operated in a first state, the EIVC valve actuation motion provided by the first valve actuation motion source is conveyed to the at least one intake engine valve via the first motion transfer mechanism and,
• wherein, when the selectable coupling mechanism is operated in a second state, at least a portion of the EIVC valve actuation motion is conveyed to the at least one intake engine valve via the first motion transfer mechanism, and the main valve actuation motion and the IEGR valve actuation motion are conveyed to the at least one intake engine valve via the second motion transfer mechanism, the coupling mechanism and the first motion transfer mechanism.