Quote:
Originally Posted by IndyIan
So I assume it uses inflatable or flexible tanks stretch to store the energy? Seems like a good idea I guess. Sort of like the wind up toy cars but uses hydraulics to wind the "spring". Good idea for a purely mechanical system as I guess hydraulic pumps are more efficient than pneumatic pumps?
Ian
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According to this 48 page PDF -
Hydraulic Hybrids : EPA Hybrid Truck Initiative
it uses hydraulic accumulators.
Though the paper doesn't explicitly say, based on the picture on page 15, I'd guess - bladder type, (nitrogen?) gas charge hydraulic accumulators.