Continuous variable valve timing

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Continuous variable valve timing (CVVT) is an automotive technology that allows the intake and/or exhaust valve timing to be varied during engine operation, except there are no discrete stages for affected components.

[edit] Implementations

Alfa Romeo - Double continuous variable valve timing. CVVT is used on inlet and exhaust valves.
BMW - Double VANOS.
BMW/PSA Peugeot Citroën - Continuous variable valve timing (CVVT)
Chrysler - dual Variable Valve Timing (dual VVT). Used on Chryslers 'world engine'.
Daihatsu - Dynamic variable valve timing (DVVT)
General Motors - Continuous variable valve timing (CVVT)
Honda - The i-VTEC system uses VTC (Variable Timing Control) to provide continuous timing variation of the intake camshaft on DOHC i-VTEC engines.
Hyundai - Continuous variable valve timing (CVVT) - debuted in the 2.0 L Beta I4 in 2005 in the Hyundai Elantra and Kia Spectra, also present in 2006 Accent and Tiburon.
MG Rover - Variable Valve Control (VVC)
Nissan - Continuous Variable Valve Timing Control System (CVTCS). The ECU adjusts the engine's timing continuously to prevent detonation/pinging and optimize gas mileage.
Toyota - Variable Valve Timing with intelligence (VVT-i), Variable Valve Timing with Lift and Intelligence (VVTL-i).
Volvo - Continuous variable valve timing (CVVT)