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Thread: modified calc_pids to use W02Ben only

  1. #1
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    Default modified calc_pids to use W02Ben only

    Joecar mentioned using the WB02ben exclusively for tuning both CL and Open Loop. I am 99% sure that the way to do this is to modify the iff statement for SELBEN. I have replaced Calc.LTFTBen with Calc.W02BEN like this:

    "iff({CALC.CL}, {CALC.WO2BEN}, {CALC.WO2BEN})"

    Thought this might help someone. Can I get a few peeps to confirm this for anyone else that is looking for this info?
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  2. #2
    Joe (Moderator) joecar's Avatar
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    That's probably the simplest easiest to understand

    Another way is to go like this:
    "iff(0, {CALC.LTFTBEN}, {CALC.WO2BEN})"

    the 0 causes the iff() to always evaluate {CALC.WO2BEN},
    but this this is a little tricker if you're not a programmer (it's easy to confuse 0 and 1).

  3. #3
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    Thanks Joe!

    I also wanted to add that when you are ONLY using WO2BEN, the following should be turned off:
    {B3801} - LTFT: Disable
    {B4205} - Closed Loop Enable Temp:I set this temp to 140C so that it never enters CL
    {B4206} - Use 02 with Open Loop Commanded Fuel: Set to Disable

    Joe mentioned if you have a COS(Customn Operatin System) then also:
    {B3647} - No Cells set to Stoich (i.e. all cells not equal to EQ 1 or fi your displaying AFR, no cells set to the same thing that {B3601} is set to.
    {B3649} - Same as B3647

    The reason I think these need to be turned off is because the SELBEN factor is calculated now based on EQ*W02Lambda. Commanded EQ doesn't tell you if LTFTs are added so the correction factor would be off.

    --wanted to add that none of this is my doing(except for my opinion at the end), I just wanted to share knowledge gained from talking to JoeCar.

  4. #4
    Joe (Moderator) joecar's Avatar
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    No worries.


    Yes, correct, except B3647/B3649 stoich cells use STFT to do trimming.

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