[WIP] Voltswagen T2 -76

[johu]

Am I overthinking this?

Yes

EMI won't be a concern with any of these signals. Choose whatever is easier

[ianlighting]

I can’t give you zombie advice, so feel free to disregard this as irrelevant, but I’ll share what I know works in my T2 using a different controller.

Engine / motor bay - local fuses, relays. Plus Leaf PDM, inverter, motor (obviously!).

VCU - up front. In my case it’s currently housed in the walkway between the front seats. I guess it’s possible I might move it under the dash, but it all works fine as is.

It means I’ve got quite a lot of wiring running back from the VCU to the motor area. Plus control and display stuff going forward to the dash.

I think I decided for problem solving in the final stages it would be a lot easier to have VCU up close to the buttons and pedals, than sat at the back where I couldn’t see any status leds etc.

[tom91]

I would keep the "power" feeds short. So the contactor wires, for the Zombie.

EMI issues woud be first seen on comms or analogue signals. General rules are:
1. Do not run signal or comms wires parallel with high current or voltage cables.
2. If you have issues you can try twisting supply, signal and ground together.
3. Still issues you can switch to shielded twisted wires

Have the zombie in an easy accessible place, for Wifi connectivity or needing to flash it if locked up. You can of course run it on a CAN bus interface for the web settings and flashing which removes this limitation.

So in the short, you can mount the Zombie in the engine bay without an issue.

[Cera]

Thanks a lot for the quick feedback! This helps with a lot of things.

Front part of the car is pretty much all wired now, but the harness connecting the front and rear is giving me slight headaches from trying to plan everything while simulataneously feeling like I still don't understand half of what I'll be needing

Draft of the rear electronics currently:



I still don't love the amount of wires I've to put into the harness nor the amount of relays I've to use but I can't seem to find a way to simplify this.

In the current sketch, the harness going between the rear/front of the car would include (from top to bottom):

- Precharge coil -> Zombie
- Negative contactor coil -> Zombie
- Positive contactor coil -> Zombie
- CAN2: At least IVT shunt <-> Zombie, but I'm hoping to use this with some Arduino's for a couple of other sensors and dash too.
- CAN1: Inverter <-> Zombie
- Inverter power relay -> Zombie

- Cooling relay coil -> Ignition on (I can't seem to figure out a better way of turning on the coolant pump + possible radiator fan)
- Heated rear window coil -> Dashboard switch

- Reverse light relay coil -> Gear selector R (same signal as for Zombie p53 to reverse direction)
- Brake light relay coil -> iBooster p24 "brake_sys_mon" (shared with Zombie p49 "Brake input")

- Power feed from main fuse -> Front fusebox
- Power feed from main fuse -> Front fusebox

- Turn indicator Left -> Blinker relay
- Turn indicator Right -> Blinker relay

- Tail lights -> Dash light switch

I also still need to figure out stuff like charge ports and possible heaters which would be located in the rear most likely.

... and leave a few extras in the main harness just in case I've overlooked something or want to add more later.