<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Michael,<div><br></div><div>I like the idea of the two numbers. Makes sense for the roadster as well. I'll add the protocol support (and documents) this weekend.</div><div><br></div><div>The bigger picture here is sophisticated charge control (including setting things like desired end SOC%/IdealMiles). I'll be working on creating a draft specification for this over the weekend.</div><div><br></div><div>For the Tesla Roadster, I've seen requests for:</div><div><br></div><div><ol class="MailOutline"><li>Cool down - when the car arrives at a specific location do a series of low-power range mode charges until battery temperature falls below a specified level.</li><li>More sophisticated TOU charging.</li><li>Complete-charging-by-time TOU charges (where car starts charging early enough to complete by a preset time).</li><li>Top-off - top of the charge just before I leave.</li><li>Freeloader - temporarily change to range mode for the duration of this one charge, then switch back to whatever mode we were in before when charge completes/stops (to make the most of free electrons).</li><li>Charge limit SOC% or Ideal Miles - only charge to the specified limit.</li><li>others...</li></ol></div><div><br></div><div>I suspect that these are all variants (and there could be many more) of a parametric-based system that we could implement relatively easily. We don't need to know all the variants - just follow some simple instructions.</div><div><br></div><div>P.S. I realise the Twizy can't stop/start the charge (yet - Nikki), but it can notify when these events happen (as you seem to be doing already).</div><div><br></div><div>Regards, Mark.</div><div><br><div><div><div>On 17 Apr, 2013, at 9:27 PM, Michael Balzer wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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Mark, Tom,<br>
<br>
nice to see you're including this now in the standard.<br>
<br>
Please reserve two time values (vars and fields for the protocol) to
also cover my charge time prediction for the Twizy.<br>
<br>
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%.<br>
<br>
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.<br>
<br>
The protocol should also include the desired SOC in percent so the
App does not need to query other data to interpret the value.<br>
<br>
Regards,<br>
Michael<br>
<br>
<br>
<div class="moz-cite-prefix">Am 17.04.2013 13:31, schrieb Mark
Webb-Johnson:<br>
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<div>Tom's CTP algorithm is in my Tesla Roadster, and I've just
started the first charge with it:</div>
<div><br>
</div>
<div>
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0px;">
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<div><font face="Courier New">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,<b>-1</b></font></div>
<div><font face="Courier New">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,<b>-1</b></font></div>
<div><font face="Courier New">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,<b>-1</b></font></div>
<div><font face="Courier New">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,<b>38</b></font></div>
<div><font face="Courier New">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,<b>27</b></font></div>
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<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Exciting times ahead, with alternative charge control
mechanisms.</div>
<div><br>
</div>
<div>Regards, Mark.</div>
<div><br>
</div>
<br>
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