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You're accusing Mark of using "strawman tactics"? Sorry, man, but that's a classic case of the pot calling the kettle black.
Let's examine your original points:
1. You claim only 50% of energy can be recaptured because only two wheels are driven and regen braking only occurs via driven wheels. This is false in a couple of ways. First of all, all cars are not 2-wheel-drive, some are AWD, and any car could be so if the designers chose to make it that way. Also, except when coasting downhill, the car received all it's kinetic energy from the driven wheels - and that energy can just as easily be recovered through those wheels. That may not be true in the case of panic stops, where additional retarding force can be gained by braking all 4 wheels, but if all your stops are panic stops you've got problems way beyond energy efficiency. The average stop made by the average person under average circumstances uses a degree of retardation that can easily be achieved with just two wheels. I also reject your claim that the car would spin without rear wheel braking "in many situations". If you drive like Mario Andretti, yes that may be true. If you drive like an average person and the road isn't covered with snow or ice, the car's not going to spin with just front (or just rear) braking.
By the way, I think your argument may have been based on the assumption that during braking, a hybrid/electric car will be braked by regen on the drive wheels and by friction on the non-drive wheels. I can't claim to know the details of how hybrid/EV braking systems work but that is certainly not how they *have* to work. If the friction brakes are being applied at the same time as regen when it's not necessary for stability or max retardation, that's just bad design and not something inherent.
Point 2: regen braking does not work at low speeds. True as stated, but you left out the facts that don't support your argument, which are that "low speed" is about 5 MPH and kinetic energy goes as the square of speed. When stopping from say 40 MPH, the energy recovered while decelerating from 40 to 5 is many many times greater than the amount that cannot be recovered while going from 5 to zero.
_______________________________________
Eric Law
Current collection:
'12 Audi A4 quattro (self-tuned)
'14 Audi A6 quattro (also self-tuned)
Gone but not forgotten:
'72 99, '77 99 (became a turbo, twice)
'80 900T 5-door, '81 900T, '86 900S (became a turbo), '86 900 SPG
'86 9000, '97 9000 Aero
A bunch of Audis, '69 Firebird, '64 Toyota Corona (first car, cost $35 and worth every penny)
Be alert... America needs more lerts!
Posts in this Thread:
- On board the UK's first fast-charge electric bus, JohnA , Wed, 13 Jun 2012 19:31:04
- Tesla Model S: 'If Apple Made A Car, This Would Be It', JohnA , Sat, 23 Jun 2012 07:17:05
- Won't work. Steering wheel is on wrong side, Used to be Chaz, Fri, 15 Jun 2012 12:43:03
- Foreign Policy Mag photoessay on electrics, JohnA , Thu, 14 Jun 2012 06:39:11
- Neil Young - e-car tinkerer, JohnA , Thu, 14 Jun 2012 12:28:20
- Show me the batteries, JerseySaab , Thu, 14 Jun 2012 07:02:30
- I got yer batteries, No Snaab, Thu, 14 Jun 2012 17:02:34
- don't be a Luddite!, JohnA , Thu, 14 Jun 2012 07:10:11
- I like electric motors, batteries are the problem, JerseySaab , Thu, 14 Jun 2012 07:44:25
- don't be so gullible, JerseySaab , Thu, 14 Jun 2012 07:18:47
- Don't be so narrowminded, ELaw , Thu, 14 Jun 2012 07:45:08
- Re: don't be so gullible, Steve T., Thu, 14 Jun 2012 07:43:49
- EV vs hybrid, Snowmobile , Thu, 14 Jun 2012 07:41:59
- The one thing I don't get:, ELaw , Thu, 14 Jun 2012 08:02:58
- Re: The one thing I don't get:, Snowmobile , Thu, 14 Jun 2012 08:14:58
- Regenerative braking is grossly over-rated, Reality, Thu, 14 Jun 2012 10:03:09
- Very poor math....what about efficiency?, Mark from Toronto, Thu, 14 Jun 2012 12:40:28
- Re: Very poor math....what about efficiency?, Snowmobile , Thu, 14 Jun 2012 13:12:17
- More like 20-30% efficient, Reality, Thu, 14 Jun 2012 13:12:08
- at WOT only!, Siegfried, Thu, 14 Jun 2012 14:57:27
- and within a certain (and limited) RPM range, Siegfried, Thu, 14 Jun 2012 15:07:49
- conversion is quite efficient....., Mark from Toronto, Thu, 14 Jun 2012 15:48:29
- Re: conversion is quite efficient....., Reality, Thu, 14 Jun 2012 19:38:28
- Re: conversion is quite efficient....., Mark from Toronto, Thu, 14 Jun 2012 21:12:09
- Strawman tactic, Reality, Fri, 15 Jun 2012 03:46:58
- Think this out please...., Mark from Toronto, Fri, 15 Jun 2012 08:54:56
- Re: Strawman tactic, ELaw , Fri, 15 Jun 2012 07:00:41
- Strawman tactic vs Triple Strawman tactic, Snowmobile , Fri, 15 Jun 2012 06:27:37
- Say what??, ELaw , Fri, 15 Jun 2012 05:13:20 <-- Viewing This Message
- apples and oranges, Siegfried, Thu, 14 Jun 2012 17:35:26
- Very good points..., Snowmobile , Thu, 14 Jun 2012 12:13:10
- Fuel consumption during idling, Kristjan , Thu, 14 Jun 2012 13:00:43
- corrected..., Snowmobile , Thu, 14 Jun 2012 12:44:11
- bah, I made the error, not you!, Snowmobile , Thu, 14 Jun 2012 12:21:49
- Correct but biased..., ELaw , Thu, 14 Jun 2012 11:43:40
- Yes, hybrids can be practical, JerseySaab , Thu, 14 Jun 2012 07:49:41
- eAAM, Snowmobile , Thu, 14 Jun 2012 08:03:07
- Re: eAAM, Mark from Toronto, Thu, 14 Jun 2012 21:16:30
- Turbo!, ELaw , Fri, 15 Jun 2012 06:06:04
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