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3rd gen HV battery smart unit(type of communication)

Discussion in 'Gen 3 Prius Technical Discussion' started by abdelellah, Oct 5, 2018.

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  1. abdelellah

    abdelellah Junior Member

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    Hi guys

    any one knows the type of communication between the battery smart unit and HV control module?
    as described by the manual it is a sort of serial communication and I'm sure it is not CAN.

    the waveform of the signals in the attached photo
    Waveform 14 (communication signal from battery smart unit to power management control ECU (HV CPU))
    Waveform 15 (CAN communication signal)
    any one can distinguish its protocol or name ,,,anything please help.



    communication wave form.jpg
     
    #1 abdelellah, Oct 5, 2018
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  2. mjoo

    mjoo Senior Member

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    That's another differential voltage signal. If it's not CAN it's probably RS-485 (what we use in our products).

    There's no communication protocol standard for RS-485 like there is for CAN. This would be proprietary.
     
    #2 mjoo, Oct 5, 2018
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  3. abdelellah

    abdelellah Junior Member

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    thanks for replay,

    is RS-485 capable of communicating through 3-4 meters long two wires?
     
    #3 abdelellah, Oct 5, 2018
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  4. mjoo

    mjoo Senior Member

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    Yes, that can easily be done by RS-485 at the highest baud rate. If I recall, 38.4Kbaud is good for around 200-500 meters. Make sure your line is terminated (120 ohm) when you patch into it.
     
    #4 mjoo, Oct 5, 2018
  5. abdelellah

    abdelellah Junior Member

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    thanks dude I will try to study the RS-485 , but i measured the resistance between the two pins of the battery smart unit and the result was a large value which i can't remember right now :unsure:
     
    #5 abdelellah, Oct 5, 2018
  6. mjoo

    mjoo Senior Member

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    The high resistance (Mohm range?) is probably circuit protection and/or active termination.

    Pixel XL ?
     
    #6 mjoo, Oct 5, 2018
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  7. PriusCamper

    PriusCamper Senior Member

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    You might want to reach out to developers for Dr. Prius/aka: priusapp.com and also Hybrid Assistant App... They've put a great number of hours into processing signals like this and may be able to help focus your efforts a bit.
     
    #7 PriusCamper, Oct 5, 2018
  8. mjoo

    mjoo Senior Member

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    If you explain what you're trying to do we might be more helpful.

    Pixel XL ?
     
    #8 mjoo, Oct 5, 2018
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  9. ChapmanF

    ChapmanF Senior Member

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    By the way, don't overlook the multiplex communication section in the Gen 3 New Car Features manual, available on techinfo, which will describe the various different networking technologies used in the car, their topologies, wire specs, limitations, etc. Seems like pretty much all the information you'd be looking for (short of actual on-the-wire protocol details; it doesn't get to that level).

    -Chap
     
    #9 ChapmanF, Oct 5, 2018
  10. abdelellah

    abdelellah Junior Member

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    They process signal for CAN layers but I need to process signal from smart ECU directly.
     
    #10 abdelellah, Oct 8, 2018
  11. abdelellah

    abdelellah Junior Member

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    I need to get HV smart unit live data, analyze it , and see how I can manipulate with the HV system.

    off-course taking care with hazards that could happen when screwing with the system.

    and I may also use the smart unit for multiple applications as measuring device.
     
    #11 abdelellah, Oct 8, 2018
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  12. PriusCamper

    PriusCamper Senior Member

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    Dr. Prius and Hybrid Assistant apps may do only CAN layer data as you say... But maybe they do more than that?

    As in you clearly get ECU smart unit live data like: temp, voltage, resistance, amps both in and out. And if you use a super fast Veepeak OBD2 the sample rate is so high, I saw it once even record a 159 amp surge on the HV's 120 amp circuit.

    What additional data beyond this are you looking for?
     
    #12 PriusCamper, Oct 8, 2018
  13. abdelellah

    abdelellah Junior Member

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    what you'r saying is correct, but I need to collect data while the smart unit is pulled out off the car and use it individually, and also get it before it goes to hybrid control unit .
     
    #13 abdelellah, Oct 8, 2018
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  14. mjoo

    mjoo Senior Member

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    The Com wires you're talking about could be sending the raw/averaged sensor values at a higher speed than CAN.

    Pixel XL ?
     
    #14 mjoo, Oct 8, 2018
  15. abdelellah

    abdelellah Junior Member

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    do you have a link for the manual that you're referring? my frustrating search ended with nothing. maybe this manual will be a starting point and will give me a clue about this type of communication.
     
    #15 abdelellah, Oct 8, 2018
  16. PriusCamper

    PriusCamper Senior Member

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    In that case I'm sure you'll want to spend $15K on the system that Nuvant makes :) Hybrid battery reconditioning|repair|rebuild tools | NuVant
     

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    #16 PriusCamper, Oct 8, 2018
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  17. abdelellah

    abdelellah Junior Member

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    it is 10 times less than the speed of CAN configuration used in Prius network as per the above picture which is 500 kbps.
     
    #17 abdelellah, Oct 8, 2018
    Last edited: Oct 8, 2018
  18. abdelellah

    abdelellah Junior Member

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    #18 abdelellah, Oct 8, 2018
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  19. PriusCamper

    PriusCamper Senior Member

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    In that case, how do I send you $100 so you can mail me one? :) Finally!!! So glad you solved all my problems!!!
     
    #19 PriusCamper, Oct 8, 2018
  20. abdelellah

    abdelellah Junior Member

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    oh man you killed every piece of my ambition when you said $100 ,, but for you I will send it for free but you will have to wait until I finish the project.;)
     
    #20 abdelellah, Oct 8, 2018
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