Continuous variable valve timing

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Continuous variable valve timing (CVVT) or VVT with some manufacturers is an automotive technology that allows the intake and/or exhaust valve timing to be continuously varied during engine operation throughout the RPM range. There are no discrete stages for affected components, as in the VTEC-style system which operates after the threshold RPM.

[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 Chrysler GEMA "World" engine.
  • Daihatsu - Dynamic variable valve timing (DVVT)
  • Ford - Variable valve timing (VVT)
  • General Motors - Variable valve timing (VVT) provides continuous variable valve timing.
  • Geely - Continuous variable valve timing (CVVT)
  • Kia - 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. On the VTEC-E engines, an SOHC 3 valve, an oil pressure actuated solenoid activated when certain conditions are met and the second of the two intake valves opens and closes with the first.
  • Hyundai - Continuous variable valve timing (CVVT) - provides continuous variable valve timing on Intake, Fuel System and Exhaust all independently controlled
  • Mazda - S-VT - The ECU calculates intake timing and actuates an oil control valve to modulate oil pressure.
  • Mitsubishi - MIVEC system for the 4B1 engine family - intake and exhaust cam timing is continuously and independently controlled
  • 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.
  • Porsche - VarioCam and VarioCam Plus.
  • PROTON - Cam Profile Switching (CPS).
  • Toyota - Variable Valve Timing with intelligence (VVT-i), Variable Valve Timing with Lift and Intelligence (VVTL-i).
  • Volvo - Continuous variable valve timing (CVVT)

[edit] External links


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