[Ovmsdev] Tesla Ideal vs Rated Range

[Tom Saxton]

Ideal miles is a terrible name because it implies something very different
from what it is.

Tesla was forced to come with a new name because the EPA changed how they
evaluate vehicles, giving less optimistic numbers for gas mileage as well as
electric efficiency and range. So Tesla called the new numbers the much more
descriptive "rated range miles", while still using the "ideal range miles"
as their estimate of what the range would be under the old EPA scheme.

   Tom

From:  Mark Webb-Johnson <mark at webb-johnson.net>
Reply-To:  OVMS Developers <ovmsdev at lists.teslaclub.hk>
Date:  Wednesday, January 22, 2014 at 5:43 PM
To:  OVMS Developers <ovmsdev at lists.teslaclub.hk>
Subject:  Re: [Ovmsdev] Ampera Range

OK, I can understand the confusion.

Perhaps that is why Tesla changed it to 'rated range' in Model S?

Regards, Mark.

On 23 Jan, 2014, at 12:55 am, Tom Saxton <tom at idleloop.com> wrote:

> "Ideal Range" as used by the Roadster doesn't mean "under ideal conditions".
> Under ideal conditions, the Roadster can go 347 miles.
> 
> Ideal range is defined by the EPA rating of the car's range, 244 miles,
> multiplied by current pack energy estimate divided by nominal pack capacity.
> The Volt's EPA rated electric range is 35 miles, although you could scale that
> up to 40 miles to account for the change in EPA testing since the Roadster
> number was set.
> 
>    Tom
> 
> From: Denis KRAUTH <denis.krauth at gmail.com>
> Reply-To: OVMS Developers <ovmsdev at lists.teslaclub.hk>
> Date: Tuesday, January 21, 2014 at 10:28 PM
> To: OVMS Developers <ovmsdev at lists.teslaclub.hk>
> Subject: Re: [Ovmsdev] Ampera Range
> 
> Hi,
>  
> Yes, I agree. If we can not read the actual range estimation of the car from
> the bus, then we should use 50 miles (80 km) as ideal range.
> Estimated range could be something below that, using a multiplyer.
>  
> What we could do to get a better estimate, is to use the temperature, as we
> have the value from the car.
> It should require a little testing, but we could find out a relation between
> temperature (both ext. and battery temp.) and the range.
>  
> Denis.
>  
> De : ovmsdev-bounces at lists.teslaclub.hk
> [mailto:ovmsdev-bounces at lists.teslaclub.hk] De la part de Paul Churchley
> Envoyé : mercredi 22 janvier 2014 02:36
> À : OVMS Developers
> Objet : Re: [Ovmsdev] Ampera Range
>  
> In my experience the range from 100% in ideal conditions rarely exceeds 50
> miles. It does occasionally and many have done well over that but for the vast
> majority, for the vast majority of the time, an ideal conditions range is 50
> miles.
>  
> We have the SOC% so can we not simply use that to adjust the ideal range?
>  
> My normal range varies from about 45 miles to about 30 miles depending on
> temp, speed etc so can we just adjust the ideal range by say, 4/5 to give
> typical range?
>  
> I realise that these are not scientific ways to estimate range but perhaps
> that is about as good as we can expect for now? We can adjust these
> multipliers once we have had a chance to test it out.
>  
> Could we use parameters to set a personal 100% ideal range and 100% typical
> range? The module could then provide a personal range based on our personal
> parameters and as we get better (or worse!) as EV driving so we could then
> adjust our personal preferences and tune our own personal range.
>  
>  
> 
> On 22 January 2014 01:24, Mark Webb-Johnson <mark at webb-johnson.net> wrote:
>  
> Seems to be a hard-coded constant:
>  
>> va_drive_distance_bat_max = MiFromKm(35);    // initial Battery distance in
>> km
>  
> I think we could be a bit 'smarter' with this - particularly given the 'ideal'
> and 'estimated' range indicators we have.
>  
> Any ideas?
>  
> Regards, Mark.
>  
> On 22 Jan, 2014, at 12:17 am, Steve Gadd <ste_gadd at hotmail.com> wrote:
> 
> 
> That's odd because i've just noticed that in the past few days - the range now
> being displayed on my Volt, which used to be as you described, is now quite
> acurate?
> 
> Steve.
> 
>   
> 
> 
> Date: Sat, 18 Jan 2014 08:58:56 +0000
> From: paul at churchley.org
> To: ovmsdev at lists.teslaclub.hk
> Subject: [Ovmsdev] Ampera Range
> 
> Just a bit of feedback regarding the range displayed on the phone app for the
> Ampera.
>  
> A full charge currently displays a range of about 22 miles. This is probably a
> bit over half the real range and well below the estimated range on the car
> dash.
>  
> 
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