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BMW Valvetronic Variable Valve Lift

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Published on Feb 1, 2012

BWM Valvetronic Electronic Valve Lift

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Valvetronic engines use a combination of hardware and programing to abolish the need for a regular throttle mechanism.

Valvetronic varies the lift of the intake valves. Based on signals formerly taken mechanically from the accelerator pedal position sensor, the stepper motor changes the phase of the eccentric cam, modifying the action of the intake valves.This system has a conventional intake cam, but it also uses a secondary eccentric shaft with a series of levers and cam followers, activated by an electronic stepper motor.

The Valvetronic engine replaces the function of the throttle body by using infinitely variable intake valve lift. Valvetronic has its own computer housed in a separate unit away from the engine management system, networked through CAN network with the digital engine management system incorporating a 40-megahertz, 32 or 64 bit computer.

Valvetronic reduces maintenance costs, lowers exhaust emissions, improves cold start behavior, and provides a smoother running engine. It also does not need specific fuel grades or fuel qualities because of its fine atomization of fuel.

Because Valvetronic allows the engine to breathe ...

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