Here is a thought. Do you drive an ICE this way? Always looking at how many
mile to empty? For most people my guess is no, older cars don't even have that
option. The old gas gauges weren't even linear moving less when full and more
as it empty's so the last half tank you go fewer miles than the first half. I
believe since EV's originally went less than a 100 miles it was like having a 2
or 3 gallon tank and so we became hyper-aware of our range and what affected
it. I venture to say most people don't even know the mileage their ICE vehicle
gets. This is probably true with Tesla owners who never owned an EV before.
Fortunately, Tesla tells you your average usage and changes your range based on
current consumption. The navigation computer is very accurate as well so it
plans where you need to stop and if you go too fast to make it then it tells
you to slow down to make your destination.
Personally, I would like a real meter that tells you Ah, volts and current in
the vehicle instead of a mile or % range indicator. Any one who built their own
vehicle knows that you can get a better picture of your range with this sort of
data than the other way but I suppose most people don't want to think or have
anything too complicated so they tried to mimic what people were used to.....
My favorite TV sit-com line was in ALF when Willie asked him how his flying
saucer worked Alf said, I don't know, I just get in it and go....... That's
most drivers.
On Tuesday, December 21, 2021, 01:46:43 AM CST, Cor van de Water via EV
<ev@lists.evdl.org> wrote:
NOT straight forward. Humans are strange animals.
One moment I may be puttering along at 55 MPH on the freeway and
suddenly remember that I need to do something before an appointment
and start driving 80 which has my consumption doubled, so the range
estimation has to correct excessively.
Another time, after I drove 80 before charging, I may set out with a
full charge only indicating 70 miles range but now I am no longer in a
hurry and again putter along at 55MPH so after driving 20 miles I
arrive with an estimated range that is *higher* than when I left on
that trip...
The range estimation is really simply a guess as to what your car can
do for you if you continue with the same parameters as you were doing
in the recent past.
I am sure that some vehicle know how to fudge the differences between
sudden drive changes and instead adapt slower or faster, but there is
no point in an EV indicating a 100 mile range trying to maintain that
illusion while I start driving it hard, it simply needs to adapt to
the new consumption as soon as possible or I will get stranded when my
driving style consumes all battery charge within 50 miles but the car
only catches up slowly and keeps pretending that I still have most of
the 100 miles range estimation while I am burning through the charge
at double the rate...
BTW, the straight estimation based on only the recent (as in the last
few minutes) consumption is also the reason that some EVs lose 10
miles of range estimation as soon as you set out and accelerate to
freeway speeds. You suddenly need to burn an extra amount of energy
that should have carried you an extra mile, so the increased
consumption at the beginning of your trip to achieve the needed
*kinetic* energy level (A.K.A. speed) is causing this drop in range
estimation. At the end of your trip, if you can anticipate and use
mostly regen braking, you get a large amount of this energy back and
your range estimation will increase again...
Cor.
On Mon, Dec 20, 2021 at 9:13 PM Peri Hartman via EV <ev@lists.evdl.org> wrote:
>
> I'm wondering why none of the EVs seem to have good range estimation. I
> think there is a very simple solution to providing reasonably accurate
> range. Maybe some of the manufacturers are doing what I'm about to
> describe, but I've never seen any discussion of such.
>
> Obviously, if the car has no knowledge of where you are going, all it
> can do is use past behavior and throw out a number. I'm really not
> interested in a range estimate based on my average, I'm interested in an
> estimate for the trip I'm about to take. What if you were to tell it
> where you are going and what route ? Then, it would potentially know
> every hill and stop light. With your past driving behavior, it should be
> able to come up with a very close estimation of how many kWh that trip
> will take.
>
> Google maps has all that info. Maybe local wind info is available, too.
> I understand privacy issues, but most people already have google
> location turned on and have their cell phones with them while moving
> about. Google already knows everything. So, could the car's software
> incorporate google maps to get the info I mentioned above ? Seems like a
> straight forward technology.
>
> Peri
>
> << Annoyed by leaf blowers ? https://quietcleanseattle.org/ >>
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