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BMW xdrive transfercase control with SM4

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  • BMW xdrive transfercase control with SM4

    I'm going to use 4wd transfercase from BMW X5 '08 in my car (BMW E30). It has a electric motor that tightens the clutch pack that transfers power to front wheels. Rear wheel drive goes "straight through".

    Elecric motor has a hall sensor to "count the position of motor". I would like to control it with tc slip % and tps. Can I do this with autronic or do I need to make somekind of box in between ?

    I would need to turn it clockwise for let's say 10 hall pulses and then when conditions are not met turn it back 10 pulses to return to normal position.

    Sorry for the poor starting info, but I'm having hard time describing what I want. Please ask for more details.

  • #2
    Do you have any wiring diagrams?
    Are there speed sensors on the front and rear transmission shafts, or are there only wheel sensors?
    If there are only wheel sensors are they magnetic or 2 wire Hall or 3 wire Hall types?

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    • #3
      Originally posted by Ian View Post
      Do you have any wiring diagrams?
      Are there speed sensors on the front and rear transmission shafts, or are there only wheel sensors?
      If there are only wheel sensors are they magnetic or 2 wire Hall or 3 wire Hall types?
      Here's the wiring diagram:



      I do have a hall sensor in the rear diff and that's wired up to sm4 and I will have one in the front driveshaft too. That's how I can use the tc slip % in the control. That's not really the problem I hope. The real problem is to drive the VTG actuator and counting the hall sensor inputs. I have no idea how that could be done... (can it be done ?)

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