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Post 7 first attached illustration, accumulator is listed at 97% pump at 91-92%. In the same documents it was recognized that the pump, which was running at prop shaft speed, was the weakest part of the design, a bent axis type (variable displacement) that dated back 70 years. My design is in wheel turning at 30% of the prop shaft, where efficiencies approach the accumulators posted 97%, with much lower flow rates and pump-motor shaft speeds.
On the highway at higher rpms above 3k, the bent axis pump-motor efficiency declines rapidly, down to 75%, an issue that does not exist in in wheel drives where 1000 rpm exceeds 80 mph.
In the real world, with todays technology 95% maybe slightly high, especially under conditions like stop and go congestion where fliud reversion and velocity are practically non issues. Even then you are talking about the level of efficiency of a manual transmission and a parts count about 30% lower for the powertrain as a whole (hundreds fewer parts), and the alternative has no regeneration capability whatsoever.
regards
mech
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