Not necessarily ATS-V related, but could be
GM patent application for a supercharger. Shown is a pushrod V8 but could be a V6, etc. Note that the compressor wheel can be driven either by the crankshaft (via gears, chain/sprocket, or belts) OR by an electric motor. If done by the latter, the PCM would be controlling the compressor's motor and thus the amount of boost independent of engine RPM and mostly independent of compressor vane geometry. No worries about no low-end or high-end boost deficiencies.
I just love FI.
'05 CTS-V, Maggie, Kooks, Hotchkis, Ground Control, Corsa, B&M, DSS/Hendrix, Full 3M Clear Bra, Autovation, V Headrests, CTS Console, STS-V 55w Fogs, Black Vette FRCs, Specter Werkes, Katech LS9 Clutch, SS Brake Lines, Heavymetals U-Turn Fuel Line Eliminator, Momo Combat Evo Shift Knob, Wldwhl Clear Sidemarkers, Linea Corse LC855 Wheels or OEM wheels w/'06-'07 Center Caps, plus a couple more. 472 RWHP/411 RWTQ (Mustang Dyno).