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Thread: How to match wideband output to {B3601}

  1. #1
    Lifetime Member mr.prick's Avatar
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    Post How to match wideband output to {B3601}

    WideBand Oxygen Sensors measure the amount of residual oxygen in the exhaust gas and convert it to Lambda value.
    Some WBO2 controllers enable you to convert the Lambda values into AFR based on user defined Stoichiometric AFR.
    Most do not but give you the expression that converts Lambda into AFR from their defined Stoichiometric AFR.
    This pre-defined expression will not exactly match the Stoich AFR value of {B3601} and is usually 14.7:1

    If using AFR for a reference it is important that the AFR value of {B3601} match the AFR output slope of the WBO2.
    If not the BEN factor multiplier will be incorrect making it unreliable for tuning the VE and MAF.

    Example #1:
    {B3601}=14.68 & {CALC.AFR_NGK} WBO2 expression of Lambda1=14.57 (V*1.4)+9
    14.57/14.68=0.99

    This is a small amount of error but there should not be any.
    Not a big deal but if {B3601} differs significantly from the AFR slope,
    BEN will be even further away from what it should be.

    Example #2:
    {B3601}=14.13 & {CALC.AFR_PLX} WBO2 expression of Lambda1=14.7 (V*2)+10
    14.13/14.7=0.96

    Here you can see BEN would remove 4% when it should not.

    To fix this either change {B3601} to match the WBO2 slope as close as possible or
    make a new expression using the slope intercept formula of y=(m*x)+b
    with the Lambda & voltage range of your WBO2 and the AFR value of {B3601}
    {B3601}*maximum Lambda=a
    {B3601}*minimum Lambda=b (intercept)
    (a-b)/voltage range=m (slope)
    x=volts from WBO2
    y=AFR

    This spreadsheet will do the work for you.
    >>>>WBO2Expressions.xls<<<<

    Input your WBO2's Lambda & Voltage range in the blue & red cells of column B then
    paste the value of {B3601} into cell B13.
    The AFR range is not necessary.
    Creating a multiplier from WBO2 Lambda and {GM.EQUIVRATIO} is another solution.
    "({Lambda}*{GM.EQUIVRATIO})"
    Last edited by mr.prick; May 31st, 2011 at 10:49 PM. Reason: Change of thread title, requested by mr.prick.
    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

  2. #2
    Lifetime Member mr.prick's Avatar
    Join Date
    Nov 2006
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    Default

    512k RoadRunner Firmware 12.14R
    FlashScan V2 Bootblock V2.07.04 Firmware V2.07.22 EFILive V7.5.7 (Build 191) V8.2.1 (Build 181)
    LC-1 WBO2

    _________________________________________________

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