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James seems to lack a lot of knowledge about hydraulic accumualtors and their application in a hybrid vehicles. Try studying the UPS hydraulic hybrid trucks which have been on the road for years.
When you have acquired some knowledge and understanding the size of the UPS accumulators, in relation to the gross weight of the trucks (26,000 lbs), you will be better informed to make judgements about the amount of weight and space necessary, especially in a car weighing less than 10% of that amount. The weight penalty issue is non existant.
Plenty of accumulators available today, with operating pressures of 3000 PSI which is what is used in many commercial applications right now, with no further development necessary. The catastrophic failure issue has been resolved long ago. If you want to get into the state of the art in accumulators, look at the America's cup racing sailboats, where cost is no issue, with accumulators operating at 12,000 PSI.
You dodged the issue about failures costing lives. Keep picking apart that which you have not researched, the result will be your points have no merit.
As far as size and weight, to quote one of the EPA heads of the research in 2006, Charles Gray, "I can hold a 500 HP hydraulic motor in my hand." Another quote by the same Engineer who was very familiar with the state of the technology, 7 years ago.
"The hydraulic hybrid will be as important to the auto industry, as was the assembly line."
They produced an 80 MPG test mule that weighed 3800 pounds, the same as a Ford Taurus of the same age.
7 years ago.
While YOU may choose to not believe facts, that is an internal issue. On a forum dedicated to improving mileage in any and every vehicle on the planet, the hydraulic hybrid has a place and if you go back to that same time frame andread all the predictions about the drastci improvements in battery technology predicted by research organizations that were heavily funded, those same predictions have proven to be very optomistic.
The same 2006 paper predicted that powertrain improvements alone would result in an 80% improvement in fuel economy. Not sure what you are trying to say when you state something about the accumulator design not being produced, when they are available off the shelf from several well known manufacturers. Used ones are available on ebay today.
regards
Mech
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