Topic summary
Valvematic
Extracted from the Wikipedia article VVT-i.
Valvematic
The Valvematic system offers continuous adjustment to valve lift and timing and improves fuel efficiency by controlling the fuel/air intake using valve control rather than conventional throttle plate control. The technology made its first appearance in 2007 with the 3ZR-FAE engine in the Noah and later in early-2009 in the Avensis. This system is simpler in design compared to Valvetronic and VVEL, allowing the cylinder head to remain at a similar height.