Electronically controlled CVTs?

[Jack Patton]

How do Electronically controlled CVTs, such as the one shown in this video

https://www.youtube.com/watch?v=EDOgdL_5VWE

, work? I'm familiar with centrifugally controlled CVTs but not very much with this type of CVT

Thanks.

 

[BrianPetersen]

A suitable mechanism drives one of the cones in or out relative to the other one, on one shaft, and the one on the other shaft has a tensioning mechanism in it.

That "suitable mechanism" in this case appears to be a stepper or servo motor of some sort. In automotive applications, more commonly it's hydraulic. The electronics operate a directional valve that either pumps more fluid into the chamber behind one of the cones, or vents fluid out of that chamber.

 

[enginesrus]

Is there always slippage between the pulleys and belt during all phases of operation in a CVT?

 

[BrianPetersen]

The design intent is that there is not slip, but it's likely inevitable to be non-zero.