出典:Wiktionary
出典:『Wiktionary』 (2024/06/30 22:07 UTC 版)
variable valve timing (countable and uncountable, plural variable valve timings)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/08 14:10 UTC 版)
In internal combustion engines, variable valve timing (VVT), also known as Variable valve actuation (VVA), is a generalised term used to describe any mechanism or method that can alter the shape or timing of a valve lift event within an internal combustion engine. VVT allows the lift, duration or timing (in various combinations) of the intake and/or exhaust valves to be changed while the engine is in operation. Two-stroke engines use a power valve system to get similar results to VVT. There are many ways in which this can be achieved, ranging from mechanical devices to electro-hydraulic and camless systems.