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Toyota Develops New Engine Valve Mechanism
http://www.autotechtoday.com/articles/21/1/Toyota-Develops-New-Engine-Valve-Mechanism/Page1.html
By Auto Tech Today
Published on 06/12/2007
 
Toyota announced today that they have developed a new fuel-saving engine valve mechanism, Valvematic, created by combining VVT-i (Variable Valve Timing-intelligent), with a new device that continuously regulates the intake valve lift volume.

Toyota Develops New Engine Valve Mechanism
Toyota announced today that they have developed a new fuel-saving engine valve mechanism, Valvematic, created by combining VVT-i (Variable Valve Timing-intelligent), with a new device that continuously regulates the intake valve lift volume.

"While conventional engines control air intake using a throttle valve, Valvematic adjusts the volume of air taken in by continuously controlling the intake valve lift volume and timing of valve opening and closing," Toyota explained in a statement. "This ensures optimal performance based on the engine's operational condition, thus helping vehicles achieve both high fuel efficiency and dynamic performance."

Specifically, Valvematic maybe able to improve fuel efficiency by 5-10%, reduce C02 emissions by 10%, and increase overall performance. Toyota said it will "introduce Valvematic shortly, starting with a new vehicle model featuring a 2.0-liter engine."