> Il giorno 27 feb 2017, alle ore 4:22 PM, ROBERT via EV <[email protected]> ha > scritto: > > I noticed a series of e-mails on regen and smart cruise control. These two > topic are closely related. I have been looking at implementing regen on an > AC motor controller. I found that designing an AC motor controller in simple > comparison to selecting the best regen implementation. There are two typical > methods for regen. If you release the accelerator then start regen. If you > depress the brake then start regen. Tesla and Nissan use the first method.
Tesla uses a different method; you must partially depress the throttle pedal to coast (zero power and zero regen). Regenerative braking gets progressively stronger as you lighten up off the pedal. It does full regen when your foot is off the pedal. > Some other companies use the brake depress method. The main advantages of > the release accelerator method is fewer components and it is simpler. The > disadvantage is with cruise control and down hill and then up hill. For in > town cruise control, it works OK. The brake depress method solves the down > hill/up hill problem; however, you do not get as much regen capacity because > at some point the mechanical brake must be enabled. Added to the > complication is the sequence of firing or not firing of the IGBTs. There are > numer > ous technical articles is the SAE journals and electrical journals proposing > IGBT firing sequences that produce better regen. All manufactures are trying > to extend the range of their vehicles. At present, improvements in inverter > and component design provide less than a percent or two of efficiency > improvement. Regen is a hot topic because a good regen implementation could > add 10 plus percent in range. At present, recoverable energy from regen in > 20 - 30 %. A smart system that could use GPS data, road map data, traffic > light data and AI programming could recover a huge amount of energy. If you > check current technical literature, you find that car manufacturers are > working on this type of system. I am interested in is what current EV do? > Is fully charging a battery not allowed so that regen can always happen? In a Tesla, it isn’t prevented. > Is regen modified when the brake paddle is depressed? In a Tesla, it isn’t modified when the brake pedal is pressed. It is purely with the throttle pedal. > Under what situations is regen disabled? Regan is disabled, or the max regen amount is limited, when the battery is fully charged or cold. > Do all EV have a regen disabled light? All EV’s don’t. > Do all EV have a regen d > isable switch? No - the Tesla does not have a switch to disable regen. Hybrids, like the Prius also do not have the ability. corbin > Which EVs only use release of accelerator method? Does regen adaptive based > on similar trips? The questions are numerous. > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20170228/15bbb0e2/attachment.htm> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at 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 Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
