| good long while. the biggest problems are the same as with the compound turbo setups in WWII (where the turbine torque was combined with the engine torque to drive the wheels/prop directly) The issue is that if you obstruct the exhaust with a turbine then you need positive pressure on the intake to keep it running. If you want to have the turbine engaged full time (even at part throttle) to drive the motor in alternator mode then your compressor is not receiving any torque to compress the intake charge. The key challenges are reducing losses in the gearing (up to 160k rpm turbine shaft vs ~3000rpm motor/alternator shaft) and losses in the torque vectoring between the electric system and the compressor (you need to constantly variate the torque split between the two systems). the obvious choice would be a clutch system, but there are significant losses there also. it's a really complex system but someone will get it right eventually, the technology already exists.
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