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Old 18th Apr 2011, 05:25
  #73 (permalink)  
Cacophonix
 
Join Date: May 2009
Location: United Kingdom
Age: 57
Posts: 211
That they would work to mitigate the energy required from the engine is obvious. If you slowed a car from, say 70mph to stop and put the energy into a reservoir and then accelerated to say 60mph before that energy was expended, (allowing for losses) you would only need to use the engine from 60mph back to 70mph and then a little power to maintain cruise. All the gas usually used from zero to 60mph would be saved.
The addition of the Kers system (plus storage/reservoir system - battery, flywheel or whatever) adds weight to the car and that weight takes energy (namely gas) to accelerate over the lifetime of driving the car.

This factor, coupled with energy storage (reservoir) and other inefficiencies means that that not all energy recouped can be put back into the system and therefore as you imply (allowing for losses) the system is not perfectly efficient so you don't get the one for one trade off implied by your last statement but I guess you didn't mean to say "all the gas".

Kers systems on road cars and buses have resulted in fuel savings of up to about 30% but the systems can be complicated and also add servicing costs etc.

Caco

Edited to say that those inefficiencies you noted have been the bane of all over unity machine visionaries since the day we started to look at machines.

Last edited by Cacophonix; 18th Apr 2011 at 06:52.
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