1) Engine technology 2) Mechanical power control
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https://www.crosswordclues.com/clue/variator
A variator is a device that can change its parameters, or can change parameters of other devices. Often a variator is a mechanical power transmission device that can change its gear ratio continuously (rather than in steps). ...
Found on
http://en.wikipedia.org/wiki/Variator
[variable valve timing] Variable valve timing (VVT) is a system for varying the valve opening of an internal combustion engine. This allows the engine to deliver high power, but also to work tractably and efficiently at low power. There are many systems for VVT, which involve changing either the relative timing, duration or opening of the e...
Found on
http://en.wikipedia.org/wiki/Variator_(variable_valve_timing)
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