VW electric coolant heater

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golfdubcrazy
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VW electric coolant heater

Post by golfdubcrazy »

HI,

Does anyone have the LIN control signals for the VW / Audi GTE Etron coolant heater.
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muehlpower
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Re: VW electric coolant heater

Post by muehlpower »

I got it working and posted my results in the VW A/C Compressor tread.

https://openinverter.org/forum/viewtopi ... 604#p26604
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Re: VW electric coolant heater

Post by golfdubcrazy »

Thanks @muehlpower sorry i miss that message. i will add it to the wiki :)
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Re: VW electric coolant heater

Post by arber333 »

I found the correct cable for HV is 3Q0971475 or 5Q0971475. The point is to use the side with a single indent, the other side i intend to cut and fit solar connectors.

LV connector looks like it is Webasto 1J0973714 8P type? Anyone has more data?
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Re: VW electric coolant heater

Post by arber333 »

muehlpower wrote: Sat Jan 22, 2022 7:39 pm I got it working and posted my results in the VW A/C Compressor tread.

https://openinverter.org/forum/viewtopi ... 604#p26604
I put basic data to Wiki under heaters.
https://openinverter.org/wiki/Heaters

Also i found a video explanation about LIN bus
https://www.csselectronics.com/pages/li ... tro-basics

Is there a way to sense temperature from LIN bus? I would like to read LIN bus for temperature and reduce power at 50deg and shutoff power for 55deg.
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Re: VW electric coolant heater

Post by arber333 »

muehlpower wrote: Sat Jan 22, 2022 7:39 pm I got it working and posted my results in the VW A/C Compressor tread.
@muehlpower
Can you post here what speed and period did you use with your LIN protocol for the VW heater?
I have tried to get LIN data from the heater but i couldnt get response from it. I am using Microchip LIN Serial Analyzer.

It is true i havent yet connected heater to HV because i need to connect water hoses and pump to have a cooled system.
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Re: VW electric coolant heater

Post by m.art.y »

Hi, does anybody know if this heater works above 400v? ~425-430V would be ideal 😊
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Re: VW electric coolant heater

Post by muehlpower »

m.art.y wrote: Sat Jun 17, 2023 8:04 pm Hi, does anybody know if this heater works above 400v? ~425-430V would be ideal 😊
This is the manufacturer. On the picture it looks a bit different than the VW part, but the voltage is given as 450V
http://datasheets.dbk-worldwide.com/EN/ ... er_eng.pdf
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Re: VW electric coolant heater

Post by m.art.y »

muehlpower wrote: Sun Jun 18, 2023 2:02 pm This is the manufacturer. On the picture it looks a bit different than the VW part, but the voltage is given as 450V
http://datasheets.dbk-worldwide.com/EN/ ... er_eng.pdf
Thanks, there are no part numbers listed anywhere. Would this heater from VW e-UP/e-Golf would be from the same family and work with the same code? Thanks again 😊
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Re: VW electric coolant heater

Post by muehlpower »

The Eberspächer heater is installed in my e-Golf. The LV plug is 8 pin. Pin 1 = Red/White, Pin 2 = Brown, Pin 4 = Violet/Yellow, Pin 5 = Green/Violet, Pin 7 = Black/Green. The rest is unoccupied.

The connector appears to be the same as the DBK, but the pinout is definitely different.
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Re: VW electric coolant heater

Post by m.art.y »

muehlpower wrote: Tue Jul 04, 2023 2:52 pm The Eberspächer heater is installed in my e-Golf. The LV plug is 8 pin. Pin 1 = Red/White, Pin 2 = Brown, Pin 4 = Violet/Yellow, Pin 5 = Green/Violet, Pin 7 = Black/Green. The rest is unoccupied.

The connector appears to be the same as the DBK, but the pinout is definitely different.
Hi, I have a DBK and Ebersprächer heaters side by side here and the pin locations and pin count is the same - both have 5 pins on the LV connector. Did your DBK only had 3 pins or the rest are not used?
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Re: VW electric coolant heater

Post by muehlpower »

VAG DBK heater Pin1 = 12V, Pin2 = GND, Pin4 = LIN
VAG AC Kompressor Pin2 = LIN, Pin5 = GND, Pin8 = 12V (same connector, different pins)

Eberspächer heater Pin 1 = Red/White, Pin 2 = Brown, Pin 4 = Violet/Yellow, (Pin 5 = Green/Violet, Pin 7 = Black/Green)

Pin2 = Brown = GND -> OK
Pin1 = Red/White = 12V -> probably
Pin4 = Violet/Yellow = LIN -> possible

my DBK also has 5 pins, only 3 are occupied.
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Re: VW electric coolant heater

Post by tom91 »

muehlpower, thank you for all your work on this.

Seeing the spec of the heater being upto 5/7kW. The LIN control message only has on byte for power level request, this means we can only request 2.5kW. Has anyone been able to get more out of the heater then the 2.5kW.

Is it possible that Byte one contains more then just the on off bit to allow "boosting" of the power.
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Re: VW electric coolant heater

Post by golfdubcrazy »

tom91 wrote: Fri Mar 15, 2024 11:45 am muehlpower, thank you for all your work on this.

Seeing the spec of the heater being upto 5/7kW. The LIN control message only has on byte for power level request, this means we can only request 2.5kW. Has anyone been able to get more out of the heater then the 2.5kW.

Is it possible that Byte one contains more then just the on off bit to allow "boosting" of the power.
Hi Tom,

i think there has been an error in the wiki. meuhlpowers post says "Byte 0 is power. 13 for 770W, 26 for 1540W"

this equates to 60w per bit. so value of 100 would equal 6kw.

when i decoded the can messages from the receive side it was in amps. value of 100 = 25amps at 350v = 8.75kw

so you should be able to get full output from this. i will try run a test this weekend to confirm.

Best Regards
Mayur
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Re: VW electric coolant heater

Post by tom91 »

I updated this yesterday, power is in % 0-100, any value above it shuts down. I updated the Wiki.
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Re: VW electric coolant heater

Post by golfdubcrazy »

I'm confused. have you sent an output of 100% to your heater and only got an output of 2.5kw ? if so can i ask what voltage you where running the heater at ? as it does have a recommended power range.
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Re: VW electric coolant heater

Post by tom91 »

golfdubcrazy wrote: Wed Mar 20, 2024 10:59 pm I'm confused. have you sent an output of 100%
Before the wiki said it was a power request in Watts and not %.

The requested 100% resulted in 13.5A draw at +/-365V or 5kW draw. So this is good and is as per expectation.

Also confirmed the heater self regulates if it gets too hot, the test setup was not bled properly. I did not create it I just made the software to run it.
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Re: VW electric coolant heater

Post by golfdubcrazy »

i pulled these from the LDF files on the site.

looks like there an extra value we can transmit which is ramp rate in a unit of watts per second.


PTCe_01: 28, HCP4_uC2_1, 4 {
TME_NV_PTC_soll, 0;
TME_NV_PTC_ein, 8;
TME_NV_PTC_Rampe, 9;
}
PTCs_01: 48, PTC1, 8 {
NV_PTC_I_ist, 0;
NV_PTC_P_ist, 8;
NV_PTC_Status, 16;
NV_PTC_Status_PTC, 17;
NV_PTC_Status_UBatt, 19;
PTC_ResponseError, 21;
NV_PTC_TimeOut_Fehler, 22;
NV_PTC_HW, 24;
NV_PTC_SW, 28;
NV_PTC_UBatt, 32;
NV_PTC_Temp_PCB, 40;
}
PTCs_02: 49, PTC1, 8 {
NV_PTC_EOL_Seriennummer, 0;
NV_PTC_EOL_Wochentag, 32;
NV_PTC_EOL_Woche, 40;
NV_PTC_EOL_Jahr, 48;
}


TME_NV_PTC_ein_encoding {
logical_value, 0, "Aus";
logical_value, 1, "Ein";
}
TME_NV_PTC_Rampe_encoding {
physical_value, 0, 7, 50, 0, "Unit_WattPerSecon";
}
TME_NV_PTC_soll_encoding {
logical_value, 254, "Init";
logical_value, 255, "Fehler";
physical_value, 0, 253, 10, 0, "Unit_Watt";
}
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