I used 4 runs of one-pair shielded cable. IIRC Toyota did the same.
You could use Cat8 cable as the pairs are individually shielded and it will have a drain wire and outer braid which you can connect to one of the relevant DRN pins on the inverter. Cat7 cable has no drain wire or braid so is not suitable.
In reality, the data rate is very slow, you may find success with just twisting your own pairs and not shielding. Depends on what else is nearby.
Re: GS450H Discussion
Posted: Fri Nov 12, 2021 11:08 pm
by ggeter
One Cat8 cable for all four pairs? Would be convenient...
Re: GS450H Discussion
Posted: Fri Nov 12, 2021 11:12 pm
by arturk
ggeter wrote: ↑Fri Nov 12, 2021 11:08 pm
One Cat8 cable for all four pairs? Would be convenient...
Yes, you can use single CAT8 S/FTP cable for all 4 pars.
I used it for resolvers as well but it may be overkill.
Re: GS450H Discussion
Posted: Fri Nov 12, 2021 11:14 pm
by ggeter
The last thing I need is questioning quality of these connections because I imagine debugging would stink. Overkill for the win! Thanks.
Re: GS450H Discussion
Posted: Fri Nov 12, 2021 11:19 pm
by arturk
ggeter wrote: ↑Fri Nov 12, 2021 11:14 pm
The last thing I need is questioning quality of these connections because I imagine debugging would stink. Overkill for the win! Thanks.
My approach was the same, no regrets .
Like you said, you do not want to worry about this.
Re: GS450H Discussion
Posted: Tue Nov 16, 2021 3:24 pm
by ggeter
Regarding cooling -- what are you guys' experience with heat generation and the transmission/inverter?
* How are you cooling? One radiator for both? Multi? None? How big?
* What kinds of water pump/pumps?
* Any idea of temperatures that you're dealing with?
Damien said in a comment once that he couldn't get the transmission to get hot in the Bexus.
Your thoughts?
Re: GS450H Discussion
Posted: Tue Nov 16, 2021 4:04 pm
by Bryson
I run one 4x8” radiator with two small fans behind it for both, looping through motor then inverter, no problems with temps at all. 1 D5 pump at medium duty, maybe 50%. I stopped monitoring after a couple weeks as it just never really got too hot.
Re: GS450H Discussion
Posted: Tue Nov 16, 2021 11:11 pm
by xp677
Standard car radiator. I think I used one from a 1L Corsa because it was cheap and small.
Pierberg pump from BMW 3 series - cheap and easy to get running
Series loop, rad > inverter > transmission > reservoir > pump
Pump set to come on when anything hits 35C, fans set to come on when anything hits 45C. Can also do speed based fans, slope them off above 20mph etc.
Pierberg pump has a built in inverter (its a 3ph motor), this can be varied as well via PWM, it also has feedback via LIN I believe.
In the Lexus, inverter shutdown temperature was 125C for any IGBT.
I never found which MTH bytes were MG1 IGBT and MG2 IGBT temp, however these were present in the scan tool and the only comms with the inverter is over MTH so it must be in there.
Re: GS450H Discussion
Posted: Wed Nov 17, 2021 2:35 pm
by PatrcioEV-ATX
xp677 wrote: ↑Tue Nov 16, 2021 11:11 pm
Standard car radiator. I think I used one from a 1L Corsa because it was cheap and small.
Pierberg pump from BMW 3 series - cheap and easy to get running
Series loop, rad > inverter > transmission > reservoir > pump
Pump set to come on when anything hits 35C, fans set to come on when anything hits 45C. Can also do speed based fans, slope them off above 20mph etc.
Pierberg pump has a built in inverter (its a 3ph motor), this can be varied as well via PWM, it also has feedback via LIN I believe.
In the Lexus, inverter shutdown temperature was 125C for any IGBT.
I never found which MTH bytes were MG1 IGBT and MG2 IGBT temp, however these were present in the scan tool and the only comms with the inverter is over MTH so it must be in there.
What type of pump? I see all kinds of different ones listed for BMW and a wide range of prices. What about this one:
Also, how are turning the pump and fan on - arduino? I have an arduino receiving CAN from the VCU that does all sorts of things, so I can use the temp_inv_water data to do what you're doing.
Re: GS450H Discussion
Posted: Wed Nov 17, 2021 4:43 pm
by konstantin8818
PatrcioEV-ATX wrote: ↑Wed Nov 17, 2021 2:35 pm
What type of pump? I see all kinds of different ones listed for BMW and a wide range of prices. What about this one:
PatrcioEV-ATX wrote: ↑Wed Nov 17, 2021 2:35 pm
What type of pump? I see all kinds of different ones listed for BMW and a wide range of prices. What about this one:
PatrcioEV-ATX wrote: ↑Wed Nov 17, 2021 2:35 pm
What type of pump? I see all kinds of different ones listed for BMW and a wide range of prices. What about this one:
What type of pump? I see all kinds of different ones listed for BMW and a wide range of prices. What about this one:
Also, how are turning the pump and fan on - arduino? I have an arduino receiving CAN from the VCU that does all sorts of things, so I can use the temp_inv_water data to do what you're doing.
This pump, I got mine for £22. Best to get one which has a plug included
I cut the outlets off and welded on some threaded pieces which will hold some regular hose barbs.
I don't run a VCU, I designed my own controller which has enough IO to handle all cooling functions as well as everything else powertrain related. You could make up a controller and use CAN or something, yes.
I run a separate loop for the cabin heating which uses another pump and a GM heater.
Fans and everything all temperature and speed based and come on automatically.
Re: GS450H Discussion
Posted: Thu Nov 18, 2021 4:55 pm
by Uppertown
An alternative for those that can't weld is to get a BMW hose with the quick connects on, cut the hose crimp and underneath is a fairly standard hose barb. You can fit a hose straight to the pump but they tend to get pushed off the soft humps.
Re: GS450H Discussion
Posted: Tue Nov 23, 2021 1:25 pm
by Gigas
Does anyone know what the next steps should be - I want to verify everything before I get a new inverter. I checked and recheck the wires - and I'm building a new harness from a stock one - just to verify. I just don't seem to be getting anything from the inverter to the VCU
Re: GS450H Discussion
Posted: Tue Nov 23, 2021 6:59 pm
by PatrcioEV-ATX
Gigas wrote: ↑Tue Nov 23, 2021 1:25 pm
Does anyone know what the next steps should be - I want to verify everything before I get a new inverter. I checked and recheck the wires - and I'm building a new harness from a stock one - just to verify. I just don't seem to be getting anything from the inverter to the VCU
Screenshot_20211122-084553_2.png
Not sure what else to suggest. You're clearly not getting good communication between the VCU and inverter. If you're sure the connections between the inverter and VCU are correct, you've got a common ground with the inverter, etc... then it should work. I do think it's interesting that in the screenshot it says "MTH Valid: Yes". To me, that implies some communication. But I stress I AM AN AMATUER AT BEST!
What version of the software are you using and have you altered it in any way?
These are the only grounds I see - they are all connected if thats what you mean by a common ground
ground 3.JPG (19.69 KiB) Viewed 5967 times
Re: GS450H Discussion
Posted: Tue Nov 23, 2021 10:05 pm
by PatrcioEV-ATX
Gigas wrote: ↑Tue Nov 23, 2021 8:58 pm
These are the only grounds I see - they are all connected if thats what you mean by a common ground
ground 3.JPG
Yes. Same on my setup. Grounded to the same place as the VCU grounds and 12v supply. Sorry.. I don't have anything else to offer.
Re: GS450H Discussion
Posted: Wed Nov 24, 2021 12:14 am
by xp677
PatrcioEV-ATX wrote: ↑Tue Nov 23, 2021 6:59 pm
I do think it's interesting that in the screenshot it says "MTH Valid: Yes".
This was just from checksum output. It didn't account for zero checksums. I later edited this line to ensure the checksum is greater than zero, otherwise an empty packet would show as valid.
PatrcioEV-ATX wrote: ↑Tue Nov 09, 2021 5:28 pm
@Bryson / @arturk - How are your cars running? Any updates for the rest of us?
Hello Folks,
I have promised update video on may project and here it is.
It is available on my channel but posting it here for you convenience
Artur
Fantastic, thank you! Couple of questions:
What kind of range are you seeing on your 48kwh pack?
Any idea final weight of your build?
What size cables are you using for main battery lines?
Re: GS450H Discussion
Posted: Mon Nov 29, 2021 4:07 am
by arturk
PatrcioEV-ATX wrote: ↑Mon Nov 29, 2021 3:36 am
Fantastic, thank you! Couple of questions:
What kind of range are you seeing on your 48kwh pack?
Any idea final weight of your build?
What size cables are you using for main battery lines?
I am getting just over 100 miles comfortably, and up to 120 on a good day. This is using around 80% of capacity.
The weight is very close 4000 lbs.
I am using Gauge 2 cables from the battery.
. 