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

[Mark Webb-Johnson]

Pretty good:

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
2013-04-17 07:29:06.768161 -0400 info  main: #71 C EV915 rx msg S 89,K,217,54,charging,standard,280,253,56,29,100,6,5,1,0,0,0,-1,156.78,17
2013-04-17 07:39:05.082637 -0400 info  main: #71 C EV915 rx msg S 92,K,219,39,charging,standard,290,261,56,39,100,8,5,1,0,0,0,-1,156.78,9
2013-04-17 07:49:03.413094 -0400 info  main: #71 C EV915 rx msg S 94,K,221,29,charging,standard,296,267,56,49,100,9,5,1,0,0,0,-1,156.78,2
2013-04-17 07:59:01.825603 -0400 info  main: #71 C EV915 rx msg S 96,K,222,25,charging,standard,301,272,56,59,100,10,5,1,0,0,0,-1,156.78,-1
2013-04-17 08:02:32.398444 -0400 info  main: #71 C EV915 rx msg S 96,K,4,0,done,standard,302,274,56,62,100,10,9,4,0,0,0,-1,156.78,-1

The original estimate, at 07:09 was 38 minutes = 07:47. Charge reached the desired mileage sometime between 07:49 and 07:59, so we were probably within 5 minutes.

Interestingly, the revised estimates during the charge were not too bad either (although that wasn't how Tom's algorithm was designed at all).

Code is now in github for any Tesla Roadster owners who wants to play. Version identifies itself as 2.3.3.

Regards, Mark.

On 17 Apr, 2013, at 7:31 PM, Mark Webb-Johnson <mark at webb-johnson.net> wrote:

> 
> 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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