[Ovmsdev] CTP: Charge Time Predictor or Chocolate Tea Pot?

[Michael Balzer]

Mark, Tom,

nice to see you're including this now in the standard.

Please reserve two time values (vars and fields for the protocol) to 
also cover my charge time prediction for the Twizy.

I've got two times on the Twizy because I calculate the estimation for 
both a desired SOC (set by the user via the "CA" command) and for 100%.

I think this should be OK for all vehicles, as many drivers do partial 
charges intentionally. If a desired SOC cannot yet be set, the 
estimation could use 80% as a default, as this is normally the end SOC 
for fast charging.

The protocol should also include the desired SOC in percent so the App 
does not need to query other data to interpret the value.

Regards,
Michael


Am 17.04.2013 13:31, schrieb Mark Webb-Johnson:
>
> Tom's CTP algorithm is in my Tesla Roadster, and I've just started the 
> first charge with it:
>
>     2013-04-17 06:59:39.975150 -0400 info  main: #71 C EV915 rx msg S
>     79,K,3,0,prepare,standard,246,222,56,0,100,0,7,13,0,0,0,-1,156.78,*-1*
>     2013-04-17 07:04:32.207360 -0400 info  main: #71 C EV915 rx msg S
>     79,K,220,0,charging,standard,246,222,56,0,100,0,5,1,0,0,0,-1,156.78,*-1*
>     2013-04-17 07:04:32.208899 -0400 info  main: #71 C EV915 rx msg S
>     79,K,220,0,charging,standard,248,224,56,0,100,0,5,1,0,0,0,-1,156.78,*-1*
>     2013-04-17 07:09:10.003015 -0400 info  main: #71 C EV915 rx msg S
>     82,K,218,56,charging,standard,258,232,56,9,100,2,5,1,0,0,0,-1,156.78,*38*
>     2013-04-17 07:19:08.396430 -0400 info  main: #71 C EV915 rx msg S
>     86,K,218,56,charging,standard,269,243,56,19,100,4,5,1,0,0,0,-1,156.78,*27*
>
>
> Prediction is the last column: 38 minutes given 56 amps @ 220 volts, 
> 24 - 27 celcius ambient, with about 80km (50 miles) to put into the pack.
>
> Exciting times ahead, with alternative charge control mechanisms.
>
> Regards, Mark.
>
>
>
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-- 
Michael Balzer * Paradestr. 8 * D-42107 Wuppertal
Fon 0202 / 272 2201 * Handy 0176 / 206 989 26

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