At 10:55 AM 21/04/2011, you wrote:
On 21/04/2011, at 8:29 AM, Mike Borgelt wrote:
Battery pack life will be the key to the economics.
Improvements in recent decades has come in the detail control of
charge/discharge.
Discharge is controlled by the electronics tapering off power output
available near bottom end of power available before incurring
declining recharge cycles (42% charge in NiM)(battery design for
150,000 recharge cycles), and tapering charge up toward the top (80%
of capacity).
At the bottom end hybrids have a turtle symbol light up to advise
the driver, at the top end 'overcharge' is possible in short bursts
(in park mode, stomp on brakes and throttle pedals concurrently),
where the driver knowingly dips into battery life by going closer to
100% charge for the benefit of maxing out available power.
My NHW-11 now at 11 years is coming up to 270,000 km on the original battery.
Two problems with that:
1) you are using 38% of the capacity of the pack so the energy/kg is
38% of the quoted battery capability which probably rules it out for
aviation use and probably pure electric cars also.
2) Nobody is talking of using the NiMH system for aviation.
I had a ride in a Prius over a year ago. Wonderful engineering tour
de force. Gets 5l/100km when driven gently. Drove a 2010 Corolla in
NZ in March. Got 6.5Kl/100km city and country.
Put the low friction tyres on it , underbody pan and cheap and crappy
interior from the Prius and it should be easy to get 6l/100km or
better. So you are paying twice the price for something that's going
to save you 1l/100km.
Hybrid cars are a marketing gimmick aimed at those who can't do
maths. Toyota's marketing department did a really good job in
identifying a large demographic there.
Mike
Borgelt Instruments - manufacturers of quality soaring instruments since 1978
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
email: [email protected]
website: www.borgeltinstruments.com
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