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Neil, I have explained this to you before on this forum. Any hydraulic hybrid does not by design need to be limited to IC primary power. Since the primary (fuel tank, electric or liquid fuel) is not relevant to the increased efficiency of the HH in recovering and reapplying recovered energy, then you should try to investigate and understand the capabilities of a HH.
The mild hybrid is called launch assist, but even in a launch assist design you can still use P&G techniques at constant speeds (beyond launch assist and beyond any electric drive to date). The belief that a direct drive all electric vehicle can recover any significant proportion of regenerative forces is also not true from an engineering perspective. No way you can generate enough electricity in any direct drive electric car at low speeds, because you can not spin the motor high enough to recover the energy. I have heard claims of 50% recovery efficiency by you and others here, but have never seen any evidence to confirm that claim.
I have also posted documentation (on this forum) that shows 33% for electric hybrids and 78% for HH designs. That documentation was avaialble from the EPA's paper in the collaberation with Ford, the University of Michigan and other manufacturers,
that was headed by Charles Gray ending in 2006.
Bottom line is in any electric powered vehicle, regardless of the configuration you could add hydraulic energy recovery and improve efficiency. It's not a matter of your preferred design or my preferred design. They are not mutually exclusive.
regards
Mech
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