I agree that the Leaf's guessometer is rather useless and confusing. The
wild readings need to be dampened, in the same way that the reading
coming from an ice fuel-tank is dampened as to not display the sloshing
going on. Tesla's range estimator is better.
But once the noob driver's anxist is over, there still may be a use for
the 2 different colored indicators.
If on a trip conditions changed (cold weather, a lot of demanding
driving, etc.) or a minor hardware problem that you want to keep an eye
on (BMS acting-up/not balancing as well, pack heater insufficient,
etc.). The 2 indicator idea should be a 'newbie' mode for the learning
driver, and be able to change modes for either when the driver is
experienced or the plugin's hardware is working OK.
{brucedp.150m.com}
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On Mon, Feb 18, 2013, at 08:28 AM, Martin WINLOW wrote:
> Yes, I like that idea. Perhaps you could have 2 different coloured
> needles on the same gauge - one for 'ideal' and the other for 'like now'.
>
> Let's not forget though, that most EVers are going to use the EV for
> doing the same trip every day and once they find out they can drive it
> without any range concerns, the whole range anxiety thing goes out the
> window.
>
> For the long distance trip though, ultimately, once a thorough charging
> infrastructure is in place, your in-car display will show your route
> overlaid with options as to when/where to charge, reminding you, no
> doubt, when things start to get a bit marginal. Again, range anxiety is
> not an issue.
>
> MW
>
>
> On 18 Feb 2013, at 13:52, Ed Blackmond wrote:
>
> > On Mon, 18 Feb 2013, Lawrence Winiarski wrote:
> >> I personally think the whole "estimated range" is a recipe for disaster.
> >> Trying to make it idiot-proof isn't going to work. There are too many
> >> variables that can affect range (headwinds, traffic, speed, hills,
> >> temperature). Idiots don't know that an "estimate" is an "estimate".
> >> When you want to make something idiot proof, you need to think about what
> >> George Carlin said:
> >>
> >>
> >> "Think of how stupid the average person is and then realize 50% of
> >> them are even stupider than that."
> >>
> >> So here's a possible answer. Set your range estimation software to the
> >> absolute worst case scenario reasonably possible. So instead of
> >> Estimated range, you say "estimated range" and
> >> "guaranteed range". Now, I personally think that might not be the worst
> >> thing in the world. You exceed your guaranteed range and you are
> >> responsible. Meanwhile
> >> you can use an estimated range for when you want to push the limits,
> >> knowing that you may very well have drive very very conservatively and you
> >> are on your own.
> >
> > I agree that a single estimated range number is useless. There are two
> > numbers that are important: how far can I go driving exactly as I'm
> > driving now, and how far can I go driving under ideal conditions. The how
> > I'm driving now number will vary wildly as you drive. It will go way down
> > when accelerating hard up a steep hill and go way up coasting down hill.
> > The ideal number will be much more stable.
> >
> > The way to present this information is with a graph or gauge. The how am
> > I doing now needle on the gauge would vary from a low of zero to a high of
> > the ideal needle. The ideal needle would vary from the vehicle's maximum
> > range to zero. Under most driving conditions, the ideal needle would be
> > monotonically decreasing. When stopped, the how I'm driving now needle
> > could change to an average over some period of time.
> >
> > This type of instrumentation would be clear to anybody. In less than five
> > minutes of driving people would begin to develop techniques to keep the
> > now needle as close as possible to the ideal needle. You would also know
> > what is possible. If the ideal needle indicated 25 miles and you needed
> > to go 50 miles you would know you had to recharge before attempting the
> > trip. If the now needle showed 10 miles, but the ideal needle showed 50,
> > then a little adjustment to driving style would make the trip possible
> > without a recharge.
> >
> > As long as the range indicators present only one number they will be
> > almost useless. Present the driver with the information needed to make
> > driving decisions in the clearest possible way without any extraneous
> > information. But don't leave out crucial information.
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