[Ovmsdev] OBD extended diag session

[Michael Balzer]

Soko,

integrating the 12V DC converter with the main charger can be
convenient, as the 12V battery also will need to be charged from the
main battery. But it doesn't look like it's done that way on the eUp.

I guess the charger only provides these additional calculations when
another unit requested them. As the other unit goes offline, the charger
stops providing after some timeout. You'll need to know which unit talks
in what way to the charger -- but the gateway won't let you see that. I
think you'll need to get access to the unfiltered bus to see what's
actually going on.

Or maybe the VCDS continues displaying these values? Then you can log &
mimic what that does.

Regards,
Michael


Am 18.08.20 um 12:00 schrieb Soko:
>
> Hi Michael,
>
> Just to make sure: I'm talking about charging the main battery, not
> the 12V battery. But I didn't check the status of the 12V battery. But
> it would be weird to happen 2 times during a charging process exactly
> after 20 mins.
> What I did is to log a complete main battery charge. Results/Details
> see here:
> https://www.goingelectric.de/forum/viewtopic.php?p=1327718#p1327718
>
> To your 2nd email:
> Yes, the values are for the DC converter of the main battery, not the
> one for the 12V battery. All values are from this ECU:
> https://www.goingelectric.de/wiki/VW-e-up-OBD2-SGC6
>
> Soko
>
> On 18.08.2020 11:54, Michael Balzer wrote:
>> Soko,
>>
>> was the charger actually working, i.e. charge in progress? If not,
>> maybe it goes asleep as soon as the 12V aux battery is topped off,
>> and another ignition state change simply reactivates the topping off
>> cycle.
>>
>> Regards,
>> Michael
>>
>>
>> Am 16.08.20 um 16:28 schrieb Soko:
>>> Hi guys,
>>>
>>> Question for the CAN and ECU experts:
>>>
>>> I am logging into the battery charger ECU on my eUp via the extended
>>> diag session code. Otherwise I get 7F as reply.
>>>
>>> I am interested in the power efficiency (pe) and power loss (pl) values.
>>>
>>> It seems though as they have another timeout than the ext diag
>>> session as I am polling it every 5 seconds. So ext diag is "always on".
>>>
>>> But after 20 minutes during charging the values change from the
>>> realistic ones to pe=100% and pl=0. To get the real values back I
>>> have to unlock the car and turn the ignition. Then I can turn off
>>> and lock the car again.
>>>
>>> Now to the question: Is this behaviour somehow known from other
>>> vehicles as well or can it be an error in my code not sending the
>>> ext diag msg correctly?
>>>
>>> Although when I dont send it at all I dont get even a value for pe
>>> and pl, just the 7F error msg.
>>>
>>> So do you think it is possible to get those values for longer than
>>> 20 mins without having to turn the ignition? Or am I out of luck
>>> here as it seems to be some VW specific thing...
>>>
>>> thx
>>> Soko
>>>
>>> _______________________________________________
>>> OvmsDev mailing list
>>> OvmsDev at lists.openvehicles.com
>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>
>> -- 
>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>>
>> _______________________________________________
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>
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-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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