[hawk2100n]

Originally Posted by serialk11r

The initial benefit I saw was that you could use a CVT or electric motor to drive the supercharger and then be able to control engine output in a very simple and possibly responsive way. However having an electric motor controlling it is going to be complicated anyways, and a CVT probably doesn't change ratios quickly enough to have any sort of acceptable response.

The most efficient way to try to get energy back from the intake would be with an actual turbine, not a compressor run backwards, but at ~70% max efficiency + friction losses + varying performance across rev range it's hard to justify the cost.

I apologize to continue to shoot your ideas down but extracting work from the incoming air is different than throttling losses.

Newtonian physics states that work is the product of force and distance. In this case the force is the pressure over the area of the rotor that is being acted upon and the distance is that portion of the rotation, dTheta. In order for work to be extracted from the system you must have a dThetha that is non-zero. You get an easily quantifiable amount of work being performed. Now on a throttle body you have some area but it isn't being moved so there is no work being performed.

Since the piston drawing air into the system is the source of the energy and is creating the potential energy in the form of a pressure differential, it MUST be doing work on the rotor. However it is not doing work on the throttle body because the throttle body does not move. Therefore, for work to be extracted from the blower, it must be extracting work that would otherwise not be extracted from the system.