Nissan Introduces New Engine Valve Control Technology - Variable Valve Event & Lift (VVEL)

March 30, 2007 Over the last century of automobile development, we have seen an enormous range of valve actuation technologies, ranging from pushrod, through single then double overhead camshafts, then a range of more recent technologies to enable variable cam timing. Nissan has now announced a new method of valve actuation that delivers a balance of responsiveness and power, fuel efficiency and low emissions. The system combines Nissan’s new Variable Valve Event and Lift (VVEL) and continuous valve timing control (C-VTC) technologies to deliver significantly enhanced performance. A rocker arm and two types of links close the intake-valves by transferring the rotational movement of a drive shaft with an eccentric cam to the output cam. The movement of the output cam can be varied by rotating the control shaft within the DC motor and changing the fulcrums of the links. This makes a continuous adjustment of the valve lift possible. The advanced technologies will be made available initially through the Infiniti G37 coupe, scheduled to be unveiled at the upcoming New York International Auto Show next week. Nissan plans to install the VVEL system, which contributes up to a 10% reduction in carbon-dioxide emissions, on its products worldwide starting from FY07 under the Nissan Green Program 2010.

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