Hi Charile,
Quote:
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Originally Posted by phoebeisis
. . . I'll paraphrase as "why does the Prius 2-a heavier, faster , bigger car-get better mpg than the Prius 1."
Do you have the relevant #s posted in any single place:
1)Weight
2) 0-60 1/4 mile
3)Claimed hp for ICE
4)Claimed HP for electrical motors
5)Total max storage capacity in watt hr for the 2 vehicles.
6) How much the batteries can be drained? 70%
7) Max "regen" energy pre 5 minutes.The Prius 2 manual says 200 watt-Hr per 5 minutes is the most it can display.I'n not sure that is the actual max it can regen, but maybe it is.
Have you been able to figure out how much of the Prius's 1 or 2 regen braking is actually from real "hitting the brake pedal braking", as opposed to the Prius's computer deciding to add subtle braking when the driver rolls off the gas, but doesn't hit the brake pedal??
I would be willing to bet that Toyota added more of this "unasked for braking" to the Prius 2. How else could they supply the extra electrical energy that the Prius 2 must use?
. . .
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Last week, Ken posted some URLs that I added to the Prius FAQ that describe many of the differences and improvements for the NHW20 over the NHW11. Take a look at those URLs and then ask your questions. But I'll give you a hint:
- more efficient transaxle --> replaced bushings with bearings on one gear. Furthermore, the higher voltage, lower current minimizes I(2)R losses in MG1/MG2
- more regenerative braking --> regeneration stays on longer and mechanical braking is held off longer
- improved coefficient of drag --> better high speed performance. This includes limited 'belly pan' panels
- ICE coolant thermos --> quicker warm-up by using previously stored coolant minimized energy lost during the warm-up
There may be more changes but these are the ones that come to mind quickly.
Bob Wilson