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Soko,<br>
<br>
sometimes values are encoded in two parts, for example a 32 bit
value may consist of a 20 bit part + a 12 bit part, with different
scaling on each part (low + high resolution).<br>
<br>
Scaling factors also can be non-intuitive, even the OBD2 standard
includes factors like 100/255. Internal values like these may be
multiples of some odd current sensor resolution.<br>
<br>
If (!) bit chunked parts represent integer and fractional parts of
the value, you may get more insight if you catch a change from
(x).999 to (x+1).000. Be aware three fractional digits may be a
rounded representation.<br>
<br>
Another option to check is the VCDS software. These systems normally
are rule based, so if you can find the rule set, you may be able to
find the value conversion scheme.<br>
<br>
Yet another option is to send crafted fake values to the VCDS to see
how they translate.<br>
<br>
Regards,<br>
Michael<br>
<br>
<br>
<div class="moz-cite-prefix">Am 18.08.20 um 09:36 schrieb Soko:<br>
</div>
<blockquote type="cite"
cite="mid:938e7b5a-35ff-c3c9-3266-64dfa5197953@soko.cc">
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<p>Morning,</p>
<p>Sorry, I reckon I've been at it for too long and did imply a
lot of things which are not obvious for someone who didn't do it
a million times already (as it feels to me :/ ). Let's do it
step by step and (hopefully) my error is somewhere in the early
steps...</p>
<p>I have OVMS (no polls active) and VCDS connected to the OBD
port via a Y cable. In OVMS I turn the canlog on so I can see
what VCDS is sending...<br>
</p>
<p>In VCDS I go into the 8C ECU and choose "Erweiterte Messwerte".
There I have a list of all values which I can activate so VCDS
polls it from the ECU. VCDS polls/refreshes those chosen values
roughly 10 times a second.</p>
<p>So I activate AmpHrs charged and discharged, and KwH charged
and discharged from the list (4 values in total). VCDS shows me
the final converted values on the screen:</p>
<p><img src="cid:part1.48A49428.B3D90140@expeedo.de" alt=""
class=""></p>
<p>OVMS logs the following on the bus:</p>
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font-family: "Courier New";"><tt><span
style="mso-fareast-font-family:Calibri;mso-fareast-theme-font:minor-latin"></span></tt></span><img
src="cid:part2.56C8F9F5.076B56C8@expeedo.de" alt="" class=""></p>
<p>As far as I understand it are the red lines the polls by VCDS
(as they are 7E5=the header of the ECU) and the green lines are
the replies. I don't understand the red "7E5 30..." line but I
reckon its just like a "Please give me the rest of the data".<br>
All 4 values are in the same PID "1E 32" (red, bold and
underlined above). And the green lines, the bold and underlined
HEX values are the actual data with the last "aa" being no part
of it.<br>
This is my procedure to get the data bytes from the
canlog-monitor lines...Maybe here is my first error somewhere?!<br>
</p>
<p>So I have 16 bytes in total to get the 4 values VCDS is showing
me:<br>
<b>00 09 de e1 ff f6 53 21 00 31 62 92 ff d0 88 04</b></p>
<p>Simplicity and the value-Ids (some internal numbers) in the
list of VCDS suggest that same order as given above. So the
first 4 bytes is AmpHrs Chrg, than AmpHrs Dischrg and so on.
This leads us to this relation:</p>
<p><img src="cid:part3.A491B004.18B9E322@expeedo.de" alt=""
class=""></p>
<p>I've also confirmed this by waiting (with ignition on) until
the last fraction of AmpHrs/kWh discharged values where changing
in VCDS to -1154,307 and -362,448 and comparing it with the
changed hex values. These hex numbers changed:<br>
<b>00 09 de e1 ff f6 53 2<u><i>0</i></u> 00 31 62 92 ff d0 88 0<u><i>3</i></u></b></p>
<p>Having said that: Not every change in the hex value changes the
display value. I have more detail data to this if needed...</p>
<p>The way they change suggests 2's complement storage. So let's
convert them into integers:</p>
<p><img src="cid:part4.91246F44.28D7D8FD@expeedo.de" alt=""
class=""></p>
<p>Now, for kWh Dischrg as an example, the factor to get from
-3110908 to -326,447 is: -3110908/-362,447=8583,07007645256.
This is a weird one as all the other factors so far have been
nice numbers!</p>
<p>If I do this for all 4 values I get these factors:</p>
<p><img src="cid:part5.3125DD5B.57AB96EC@expeedo.de" alt=""
class=""></p>
<p>This cannot be right and therefore a waited a few weeks and did
everything above again. The result was the same unfortunately:</p>
<p><img src="cid:part6.D5605CED.217A3243@expeedo.de" alt=""
class=""></p>
<p>Some other values have an offset. Like the power-efficiency on
the charger-ECU. The value=0x00 means 75% and 0x06 means 75,6%.
It's a quite clever way of using just one byte for this value!<br>
So I thought they use some offset here to. But if I take the
delta of both days I logged I get the same factors:</p>
<p><img src="cid:part7.3CE14B3F.ACD6B827@expeedo.de" alt=""
class=""></p>
<p>For AmpHrs Chrg the first value was 1177,611 and the value week
later was 1424,809 which gives the delta of 247,198.</p>
<p>So now I'm really out of ideas and thought I ask you guys. As
you can see all conversion factors are close to each other but
not exactly the same. And given that the VW engineers are quite
clever I can't accept they would use such weird factors for a
conversion.</p>
<p>If you have now another look at the one screenshot I took in my
first mail you should understand it as it is just the complete
version of the bits I did here...</p>
<p>Any ideas are highly welcome.</p>
<p>Soko<br>
</p>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
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</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
</pre>
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