The
Valvetronic system replaces the function of the butterfly throttle
valve in the engine by using an infinitely variable intake valve with
fully adjustable timing and lift.
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The
system has a conventional valve camshaft, but it also uses a secondary
eccentric shaft with a series of levers and roller followers, all
activated by a stepper motor.
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Based
on signals from the accelerator pedal and the engine sensors, the
stepper motor changes the phase of the eccentric shaft, modifying the
opening and closing profile of the intake valves.
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If the finger follower push
deeper, the intake valves will have a higher lift, and vice-versa.
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