Power Wheelchair Drive Controls, Part 2: Non-Proportional Even though proportional drive controls are by far considered to be the most common type of drive controls used to drive power wheelchairs, I believe it is important that we look at non-proportional controls first. Why? Because non-proportional drive controls offer the most basic and simplistic option for activation in terms of motor function, cognition, and overall experience. 7/31/2019 Keep Reading