If only, in their focus groups, they had asked the question: would you rather have an accurate remaining-kwh meter or an fairly inaccurate remaining-miles meter?
Peri -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of Lee Hart via EV Sent: 09 May, 2014 8:21 AM To: Willie2; Electric Vehicle Discussion List Subject: Re: [EVDL] Miles Remaining Willie2 via EV wrote: > The Leaf instrumentation is complete crap. The Leaf is a wonderful car. I've driven one! But it's designed for Mr. and Mrs. Nontechnical, who think all that 'lectrical stuff has something to do with watting vaults to store currants at 'ome. Focus groups said they want a miles-to-go gauge. So marketing says, "Give them a miles-to-go gauge". The engineers probably said, "We can't really do that." So we'll make it just like the gas gauge in a normal ICE car -- wildly inaccurate. > Tesla instrumentation is pretty good. Both pale in comparison to a > simple TBS type amp-hour counter. An amphour counter (or better, a KWH counter) is pretty close to an honest "gas gauge", that accurately tells you how much fuel is in the tank. It's then up to the driver to estimate how far he can go on that amount of fuel. Some people can do it -- others can't. How often have you heard someone say, "I'm almost out of gas -- I'd better drive faster to get to a gas station before it runs out!" For years, I've thought that someone should make a fuzzy-logic fuel gauge. (Fuzzy logic is a serious discipline, despite the funny name). It would tell you how many KWH are left in the battery. It estimates this by watching each charge/discharge cycle, and learning how many KWH it can deliver before the battery is "dead". -- Results! Why man, I have gotten a lot of results. I know several thousand things that won't work. -- Thomas A. Edison -- Lee Hart's EV projects are at http://www.sunrise-ev.com/LeesEVs.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)
