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Thread: What PID to scan commanded afr & injector duty cycle for e78

  1. #21
    Joe (Moderator) joecar's Avatar
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    Does E38.AFRATIO_DMA work (by any chance)...?

    I pm'd Tech Support to see what they say.

  2. #22
    Lifetime Member wesam's Avatar
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    I tried E38.AFRATIO_DMA it is working with E38 but it is not workingwith E78
    EFILive Tuner

  3. #23
    Lifetime Member wesam's Avatar
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    Any updates ?
    EFILive Tuner

  4. #24
    Joe (Moderator) joecar's Avatar
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    Not yet.

  5. #25
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by wesam View Post
    I'm on V7 build 211 and V8 build 203
    Its showing wrong numbers when logging
    check this log
    Attachment 13912
    E78.AFRATIO_DMA shows 9.06 throughout the log... what is the stoich AFR set to in the tune file (can you post the tune file...?)...?

  6. #26
    EFILive Developer Site Admin Blacky's Avatar
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    Have you tried logging SAE.LAMBDA?
    Regards
    Paul
    Before asking for help, please read this.

  7. #27
    Lifetime Member wesam's Avatar
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    No i did not
    but i need to log the commanded afr to make sure the pe is engaged because E78 is different than E38 it depends on load in some tables for pe enable
    i don't want to risck this engine because its FI
    EFILive Tuner

  8. #28
    EFILive Developer Site Admin Blacky's Avatar
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    SAE.Lambda can be used to obtain the commanded AFR. You have to apply a calculation involving the stoichiometric value of the fuel being used to get the actual AFR.
    What I was asking was, does that PID actually return correct Lambda values or does it too flatline like the AFR PID?

    It is called Lambda, but I think the value it returns is actually EQRatio. Here's the SAE definition for that PID, it is extremely confusing.
    Fuel systems that utilize conventional oxygen sensor shall display the commanded open loop F/A equivalence ratio (also known as lambda) while the fuel control system is in open loop. EQ_RAT shall indicate 1.000 while in closed-loop fuel. Fuel systems that utilize wide-range oxygen sensors shall display the commanded F/A equivalence ratio (lambda) in both open-loop and closed-loop operation.
    NOTE:
    - A/F Equivalence Ratio (AFR) = Stoichiometric A/F Ratio) / (Actual A/F Ratio); > 1 is rich, < 1 is lean.
    - Lambda (λ) = (Actual A/F Ratio) / (Stoichiometric A/F Ratio); > 1 is lean, < 1 is rich.
    - Lambda is the inverse of A/F equivalence ratio.
    - F/A Equivalence Ratio (FAR) = (Stoichiometric F/A Ratio) / (Actual F/A Ratio); > 1 is lean, < 1 is rich.
    - Lambda is the same as F/A equivalence ratio.

    To obtain the actual A/F ratio being commanded, multiply the stoichiometric A/F ratio by the inverse of the equivalence ratio (lambda). For example, for gasoline, stoichiometric is a ratio of 14.64:1. If the fuel control system was commanding an 0.95 LAMBDA, the commanded A/F ratio to the engine would be 14.64 * 0.95 = 13.9 A/F.
    I think what that is trying to say is that the value returned by the PID SAE.LAMBDA is what EFILive calls EQRatio (and because of that, this PID is now called SAE.EQ_RAT in the V8 scan tool software).
    What EFILive calls EQRatio is the simple inverse of what EFILive calls Lambda.


    Regards
    Paul
    Before asking for help, please read this.

  9. #29
    Joe (Moderator) joecar's Avatar
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    wesam,

    if the pid SAE.LAMBDA works then I can edit your calc_pids.txt to create a BEN pid...

    post a log containing SAE.LAMBDA and your wideband.

  10. #30
    Joe (Moderator) joecar's Avatar
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    wesam,

    note that you can log all the EXT.WO2xxx pids for free (costs no pid channels)...

    for your calc pid I would like to use EXT.WO2LAM1, so please log this in addition to SAE.LAMBDA (I'll figure out if it is Lambda or equivalence ratio by looking at it).

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