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Same Strawman tactic
Posted by Reality (more from Reality) on Fri, 15 Jun 2012 06:26:22
In Reply to: Say what??, ELaw , Fri, 15 Jun 2012 05:13:20
1. Go back and read my post again. I gave 3 reasons that combined to result in recoverable kinetic energy being 50% or less; don't accuse me of stating 2 wheels out of 4 therefore 50%. If you are dumb enough to think it's a matter of 2/4 = 50%, don't attribute it to me; you have your own silliness to deal with. My estimate is that in a typical car, about 70% of the braking is done by front wheels. However, that 30% of kinetic energy made unavailable by rear wheels goes a long way towards helping the other two reasons that I gave in pushing available kinetic energy below 50% (only 20% left for the other two factors to do).

2. Do you have reading comprehension problems? I specified the context of "when going down hill" when talking about the risk of vehicle spinning if braked from the front wheels only. Why did you remove that context, and accuse me of suggesting high risk of vehicle spinning under all circumstances? Do you have reading comprehension problems or are you just engaging in pointless strawman tactic? BTW, driving in the hills is one of the situations where regenerative braking is especially helpful (predicable and gradual braking pattern), and one that Mark cited for his driving environment. Yet at the same time, down hill braking is where rear brake participation is important in maintaining vehicle stability.

Almost none of the electric cars or hybrids on the market today electrically drive all 4 wheels. You'd incur drive additional train loss all the time anyway if all 4 wheels are driven; it's not entirely clear that design would recover more energy (remember the rear wheels only contribute about 30% of braking) than wasted energy in drive train loss all the time.






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