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Toyota unveils variable valve lift concept

Toyota has developed a variable valve lift mechanism by combining VVT-i (Variable Valve Timing-intelligent), which continuously controls intake valve opening/closing timing, with a new mechanism that continuously controls the intake valve lift volume.

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

In the case of a new 2.0-litre engine developed by Toyota, Valvematic improves fuel efficiency by 5 to 10 per cent depending on driving conditions, reduces CO2 emissions, boosts output by at least 10 per cent and enhances acceleration responsiveness. Toyota plans to introduce Valvematic shortly, starting with a new vehicle model featuring a 2.0-litre engine.

Toyota has said that it plans to completely revamp its gasoline engine and transmission lineup by 2010.

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