Patent ID: 7765965

Claim:
A variable valve actuation system for an engine comprising at least: a valve; an actuator; a first modifier mechanism, said first modifier mechanism comprises a first modifier control; a second modifier mechanism, said second modifier mechanism comprises a second modifier control; said actuator moves in synchronization to the engine and provides displacements of substantially constant profile to said first modifier mechanism, said first modifier mechanism receives said displacements of substantially constant profile, modifies them controllably, according the state of said first modifier control, into secondary displacements and provides said secondary displacements to said second modifier mechanism, said second modifier mechanism receives said secondary displacements from said first modifier mechanism, modifies said secondary displacements controllably, according the state of said second modifier control, into final displacements and provides said final displacements to said valve, the one of said modifier mechanisms can provide displacements of substantially different lift than the lift of the displacements it receives while the other one of said modifier mechanisms can provide displacements of substantially different duration than the duration of the displacements it receives.