Michael, It takes a higher current for a motor to push a given vehicle up a hill than on the level thus there is more loss due to inefficiencies. The lower current on the level has lower losses so usually a flat run uses less battery energy than a hilly one. In my Gizmo the difference isn't really that much like it might be with an ICE.
On Wed, Nov 20, 2013 at 4:35 PM, Michael Ross <[email protected]> wrote: > Cor, this is really a theoretical topic. Why should a level ride be easier > than a hilly ride if it is a circuit? > > I disagree about regen saving anything except when used for braking, then > you are trading waste heat for some charging.. If you use regen to slow > down on hills you are causing an inefficiency. > > If you are on a hill that is too steep for safe coasting and brakes must be > used, then regen is better than heating your brake rotors. > > If you take all this out of the thought experiment, then hilly and level > are equal. > > > On Wed, Nov 20, 2013 at 7:22 PM, Cor van de Water <[email protected]> wrote: > >> Michael, >> How often do you encounter a steep road that is completely straight in >> the mountains? All the roads in the surrounding mountains that I know >> have sharp turns, for which you will *definitely* want to slow down. So >> except if you are in roller-coaster country, having regen will save at >> least part of the energy from the downhill run when you need to slow >> down for the next turn... >> >> BTW, it may be that the information is skewed due to the redefinition of >> electric vehicle by some manufacturers. I have noticed that my Prius can >> get better mileage going over a large hill than when doing a steady >> speed in flat terrain. This is probably similar to the "Pulse and glide" >> hypermiling technique. This has of course nothing to do with pure >> electrics, but since GM calls their plug-in hybrid an EV, that may be >> where the confusion comes from... >> >> Regards, >> >> Cor van de Water >> Chief Scientist >> Proxim Wireless Corporation http://www.proxim.com >> Email: [email protected] Private: http://www.cvandewater.info >> Skype: cor_van_de_water Tel: +1 408 383 7626 >> >> >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] On >> Behalf Of Michael Ross >> Sent: Wednesday, November 20, 2013 3:51 PM >> To: Electric Vehicle Discussion List >> Subject: Re: [EVDL] EVLN: Kia Soul EV goes global and aims >> for120-miledrivingrange >> >> I am not talking about regenerating. The net change in gravitational >> energy is zero on a round trip. I am talking comparing level to hilly, >> and >> that is all. Drive around the circuit, go steady on the level course, >> only >> brake at the end,; on the hilly course, coast down hills so you don't >> waste >> on regenerating (there is inefficiency if you regen, but if you just >> reduce >> power or coast that is fine). There is no difference between level and >> hilly - except - if you hit higher speeds going downhill you have more >> wind >> resistance. Change in SOC ought to be the same either way. >> >> I am not sure why you want to regen on the downhills... that will queer >> the >> deal. Regen for braking that is what is for. >> >> >> >> >> >> >> On Wed, Nov 20, 2013 at 6:17 PM, rayfellow <[email protected]> wrote: >> >> > What I've heard is that amount of energy captured going down hill >> (regen) >> > results in power to the wheel of about 30%. There's power lost at >> each >> > step >> > along the way - generating electricity, storage, release and then >> power to >> > the motor. The net result is 30%. >> > >> > >> > >> > >> > >> > >> > -- >> > View this message in context: >> > >> http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-Kia-So >> ul-EV-goes-global-and-aims-for-120-mile-driving-range-tp4666302p4666339. >> html >> > Sent from the Electric Vehicle Discussion List mailing list archive at >> > Nabble.com. >> > _______________________________________________ >> > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> > http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> > For EV drag racing discussion, please use NEDRA ( >> > http://groups.yahoo.com/group/NEDRA) >> > >> > >> >> >> -- >> Put this question to yourself: should I use everyone else to attain >> happiness, or should I help others gain happiness? >> *Dalai Lama * >> >> Tell me what it is you plan to do >> WIth your one wild and precious life? >> Mary Oliver, "The summer day." >> >> To invent, you need a good imagination and a pile of junk. >> Thomas A. >> Edison<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> >> >> A public-opinion poll is no substitute for thought. >> *Warren Buffet* >> >> Michael E. Ross >> (919) 550-2430 Land >> (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google >> Phone >> (919) 631-1451 Cell >> (919) 513-0418 Desk >> >> [email protected] >> <[email protected]> >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: >> <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131120/e78a >> f08a/attachment.htm> >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> For EV drag racing discussion, please use NEDRA >> (http://groups.yahoo.com/group/NEDRA) >> >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> For EV drag racing discussion, please use NEDRA ( >> http://groups.yahoo.com/group/NEDRA) >> >> > > > -- > Put this question to yourself: should I use everyone else to attain > happiness, or should I help others gain happiness? > *Dalai Lama * > > Tell me what it is you plan to do > WIth your one wild and precious life? > Mary Oliver, "The summer day." > > To invent, you need a good imagination and a pile of junk. > Thomas A. > Edison<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> > > A public-opinion poll is no substitute for thought. > *Warren Buffet* > > Michael E. Ross > (919) 550-2430 Land > (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone > (919) 631-1451 Cell > (919) 513-0418 Desk > > [email protected] > <[email protected]> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131120/59062773/attachment.htm> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > -- David D. Nelson http://evalbum.com/1328 http://www.levforum.com _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
