Editing VVT-i (section)

== VVT-iE ==
[[Image:Lexus 1UR-FSE.jpg|thumb|The 1UR-FSE engine, the first to feature VVT-iE]]

'''VVT-iE''' (Variable Valve Timing - intelligent by Electric motor) is a version of Dual VVT-i that uses an electrically operated actuator to adjust and maintain intake [[camshaft]] timing.<ref>{{Cite web |url=http://lexus.jp/models/ls/performance/engine/engine.html |title=Lexus LS engine page |access-date=2009-09-29 |archive-url=https://web.archive.org/web/20090503215006/http://lexus.jp/models/ls/performance/engine/engine.html |archive-date=2009-05-03 |url-status=dead }}</ref> The exhaust camshaft timing is still controlled using a hydraulic actuator. This form of variable valve timing technology was developed initially for [[Lexus]] vehicles. This system was introduced on the ''[[Toyota UR engine|1UR-FSE]]'' engine in the 2007 [[Lexus LS|Lexus LS 460]]. The electric motor in the actuator spins together with the intake camshaft as the engine runs. To maintain camshaft timing, the actuator motor will operate at the same speed as the camshaft. To advance the camshaft timing, the actuator motor will rotate slightly faster than the camshaft speed. To retard camshaft timing, the actuator motor will rotate slightly slower than camshaft speed. The speed difference between the actuator motor and camshaft timing is used to operate a mechanism that varies the camshaft timing. The benefit of the electric actuation is enhanced response and accuracy at low engine speeds and at lower temperatures as well as a greater total range of adjustment. The combination of these factors allows more precise control, resulting in an improvement of both fuel economy, engine output and emissions performance.

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