Posted by Bob M on April 21, 2009 at 12:41:55 from (151.190.254.108):
In Reply to: 50mpg from brakes? posted by CWL on April 21, 2009 at 11:08:15:
That idea's been floating around for many years. (I recall my dad telling about analyzing it when he was in engineering school shortly after WWII...)
Unfortunately the concept has a bunch of problems:
1 - Complexity. You need accumulators, valving, motors, piping and controls (= added cost and weight)
2 - Control - Being able to continuously modulate braking and acceleration is a key to safe driving. Hydraulics and compressed air do not lend themselves easily to this - particularly the brake modulation part.
3 - Efficiency. Unless a way is devised to adiabatically compress/expand gases - ie. without heat transfer - in an accumulator or compressed air receiver, total system efficiency (ie. % of braking energy stored vs % of energy returned back to the wheels) for hydraulic accumulator and compressed air systems is somewhat disappointing.
4 - ALL regenerative braking systems are effective only during continuous stop-go driving. Driving at steady speed (cruising the interstate or even just running over to the next town) regenerative braking schemes REDUCE fuel mileage on account of the extra weight that is carried.
Bottom line is with current technology the small engine + battery hybrid represents the most economical regenerative braking solution for automobiles. And it's not likely to change anytime soon.
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