So I got it on the road again (MOT/TUV) and used it for a first holiday trip, which went great. (but not far :D )
Range could be up to 250km, but the current sensor is not attached yet and I haven't enabled regen yet. That will happen in the upcoming period.
Then I get a more accurate idea of the ...

So it had been quite for a long time as I did not have the time to work on it, but since a few months I'm back on it and it is almost finished.

I ended up replacing the power steering pump with an Opel one, which easy enough just works on the two wires on 12v+.
It seems to generate enough pressure ...

I also found a LinkedIn post from EV Clinic, describing a software lockout of a crashed pack of this BMW generation:

https://www.linkedin.com/posts/ev-clinic_bmw-i4-post-crash-battery-recovery-although-activity-7337592958784786432-FplZ?utm_source=share&utm_medium=member_desktop&rcm ...

It won't send CAN on it's own & it's also CAN-FD at 500/2mb - not standard CAN. You can hold wake high it seems - and it'll stay awake waiting for CAN. It'll start sending it's messages with just a counter sent to it on 0x0C0 (you'll see it in the code)


Hi, I finally got around to this project ...

That makes it quite easy to modify.

For European situation where 3 phase is much better, but with the limitation of 7.2 or 7.4kW, it is probably best to add another 3.3/3.6kW charger on a second phase. So if the limit is 16 amps AC @ 230v but a second phase is detected, it could charge on two ...

Wow this is great. I did not expect the OBC to communicate without CAN bus.

My situation is I have a European Bolt (Opel Ampera-E) which also just charges at single phase 230v 7.2kW just like in the US, but it would be great to have a three phase upgrade.
If it is just PWM as the base, it is great ...

Wouldn't it be easier to attain the rear drivetrain part from a 4wd element? Although it might not like the power?

cloudy wrote: ↑Sun Dec 08, 2024 11:55 pm iX support is now in main release of battery emulator - do still need someone with an un-crashed battery to test contactors with though!

Great!
Still without balancing right?

It won't send CAN on it's own & it's also CAN-FD at 500/2mb - not standard CAN. You can hold wake high it seems - and it'll stay awake waiting for CAN. It'll start sending it's messages with just a counter sent to it on 0x0C0 (you'll see it in the code)


I probably got the wiring right but had ...

I'm also working on Gen5 packs - have started some documentation on the dala wiki:
https://github.com/dalathegreat/Battery-Emulator/wiki/BMW-iX,-i4%E2%80%90i7-Platform

I also have a battery emulator feature branch that has basic support already. https://github.com/dalathegreat/Battery-Emulator ...

I'm not sure what sensor you are referring to. The Opel pumps don't have (or require) any external hardware to run and they stop once the "Ignition On" signal is not present anymore.


Yes, it stops automatically when needed, so there is probably a sensor in there.
The question is, are there any ...

I'm buying a second hand electric steering pump from Opel, they are easy to find.
It is the one from the wiki page: https://openinverter.org/wiki/Opel_Power_Steering_Pump

As far as I understand they all have a sensor to stop automatically as mentioned.

But when I search for the second hand pumps ...

Hi, just checking was this working before and has now stopped ?

if so normally these pumps have a 3rd wire which is wired to IGN, probably best to check that its still got the IGN 12V signal.

the vw version of this pump has been known to fail from time to time and it might just need replacing ...

You need to reverse engineer the power supply on the board, look for big caps, diodes and chips with big heat sink or on big pads. then look at datasheets.


Well, these are the times I notice I am a software engineer :shock:

But it seems that the positive and negative are not that hard.
This ...

I'm struggling with the pinout. The CAN bus was very quickly found, a twisted wire and measuring 120 Ohm.
There are enough indications of what 12v+ is, the ground perhaps also, but probably needs a wakeup / key on kind of extra signal.

I'll post some pics later

Ok thats great.
It sure would be nice to have the pinout, although it probably just requires some trying to apply 12v and what not. I don't really have a clue to start on, it will just be trying.
Hopefully I can identify the CAN wires as they are often twisted.

But yeah, I'm sure there is a pretty ...

By the way, these are the temperature sensors, two per module.
I haven't tried much other than to measure resistance over pins that weren't giving any cell voltage (so they must be sensor related) but I could measure any resistance value over any combination.
So probably something digital or ...

I will investigate. Maybe I build the BMS and try it.


In this case, being at the BMU level will be easier. I'm interested in seeing what the BMU looks like :)


Does the above answer some of your questions?

Probably not, it may require some signal level debugging.
I don't have a (usb ...

Here the full Infineon microcontroller part number

https://www.infineon.com/cms/en/product/microcontroller/32-bit-tricore-microcontroller/32-bit-tricore-aurix-tc2xx/aurix-family-tc27xt/sak-tc275tp-64f200n-dc/

Schermafbeelding 2024-04-07 204410.png

So, it seems this MCU talks to the Panasonic ...

Ok so I opened the BMU. That should give some people some more clues.

I didn't do any power up and checking for communication or anything, just opening and taking pictures.

The BMU is on a liquid cooling plate.

It turns out the main BMU PCB has an Infineon tricore mictrocontroller on there. I ...

Well, all I can say is keep up the good work.

The BMW REX might not be perfect, I think it is one of the only options around for DIYers looking for a compact range extender.
All the alternatives are much bigger engines integrated into a drivetrain.

Regarding the power steering, I have sent out some questions, if all these paths run dead (quite likely) I will go for something more simple.
I'm thinking these Opel pumps as they can be enabled very easily and very cheap.
But yeah, such a controller with GPS is nice too.


> He said he bought it ...

It also looks similar to the Ford Galaxy pump BG91-3K514-AC.

I found some info for a Ford pump here. https://www.diyelectriccar.com/threads/azure-ford-electric-steering-pump.88303/


Thanks, it looks to be the same physical pump, but the rest I'm not sure.

The pump doesn't announce itself with ...

Oh, I found a part number that I didn't find before opening this topic.

Part number A0016240, so it as an EHPS pump from a W221 Mercedes S-class.
Apparently it can also be found in a Porsche Panamera and Cayenne/Touareg (with a VW sticker on the pump)

This might give more clues to find some CAN ...

I made a seperate topic for this power steering pump. I did some CAN bus debugging, but without any further info, it is quite hard.
It probably needs to be replaced.

viewtopic.php?t=4882