Can anyone tell me how pedelec sensor in PAS bicycles work? While doing a literature review I found out about pedelec sensors (while googling some sensor to find torque applied by the rider). Is anyone who has used it willing to share the mechanism and can you briefly explain the mechanism?
From my experience working with electric bikes, most of what I saw were sensors that were mounted on the crank which measure your biking cadence. A sensor would be fixed around the bottom bracket, and then a ring of magnets would spin with the crank, 'tripping' the sensor every time a magnet passed.

They're called hall effect sensors and should be easy to integrate into your design as buying just the PAS sensor is relatively inexpensive.

You can find a Wikipedia page that covers Pedelec sensors here.