[Ovmsdev] OBD extended diag session

[Soko]

Yeah, I've also thought about VCDS but when I used it during charging it 
was just for a couple of minutes and the ignition was on all the time as 
I was getting a hole bunch of data and values from it...

So another fork of the whole e-Up via OBD project I should investigate. 
It doesn't get boring for sure :D

On 18.08.2020 12:41, Michael Balzer wrote:
> 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
>>>
>>> _______________________________________________
>>> OvmsDev mailing list
>>> OvmsDev at lists.openvehicles.com
>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>>
>> _______________________________________________
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>
> -- 
> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>
> _______________________________________________
> OvmsDev mailing list
> OvmsDev at lists.openvehicles.com
> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
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