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Thread: [CODING][ME7.2]Anyone changed AIMV in ecu ? (Wheel speed pulses per km)

  1. #1
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    [CODING][ME7.2]Anyone changed AIMV in ecu ? (Wheel speed pulses per km)

    Hello, as title say i have question if anyone changed this variable.
    Found out that AIMV in me7.2 is 24161074 but i have no idea why this number is so high. Also i have to put my number of pulses which is 468 for 17" 215/40/17 wheel in bmw e30

  2. #2
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    Where are you getting these numbers? If you got them from a binary then it sounds like you're using the wrong XDF file.
    Last edited by MotorMouth93; 06-17-2019 at 04:47 PM.

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    aimv.PNG



    According to the data sheet FNRAD is the pulse between wheel rotation translated to speed so the two items most likely will require editing in tandem IMO I attached the pages from the function sheet that outline the two items


    AIMV is calibration pulses

    fnrad1.png
    fnrad2.png
    Last edited by zarboz; 06-19-2019 at 11:17 PM.
    I like to pretend I know stuff

  4. #4
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    the OLS I have for this DME also shows that crazy value for AimV

    I think the OLS shows this in the wrong spot if you look at both Damos files it shows the Aimv as a value equaling 2670.0000134 or 0X19B7914
    I like to pretend I know stuff

  5. #5
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    Quote Originally Posted by zarboz View Post
    the OLS I have for this DME also shows that crazy value for AimV

    I think the OLS shows this in the wrong spot if you look at both Damos files it shows the Aimv as a value equaling 2670.0000134 or 0X19B7914
    Thats the problem i guess, i have the same damos files, anyone found correct address for speed pulses ??

  6. #6
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    what I am saying is the OLS is wrong the damos is probably right


    most the time it is the other way around I will see what I can figure out for you on this maybe because i am curious as well


    my mph is about 3-4 miles off and its annoying
    I like to pretend I know stuff

  7. #7
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    Quote Originally Posted by zarboz View Post
    what I am saying is the OLS is wrong the damos is probably right


    most the time it is the other way around I will see what I can figure out for you on this maybe because i am curious as well


    my mph is about 3-4 miles off and its annoying
    Oh thanks lets figure it out
    You could adjust 4-5mph by FNRAD, aftermarket wheel size ?

    -edit-
    Found something about AIMV but in ME9 ecu:
    Screenshot_20190622-164349_Chrome.jpgScreenshot_20190622-164341_Chrome.jpg
    Last edited by Kisu1337; 06-22-2019 at 10:49 AM.

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    still don't get it ... see attachement above ME9, they factor it and still shows some huge numbers T_T
    @bump

    Anyone ?

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    Quote Originally Posted by Kisu1337 View Post
    still don't get it ... see attachement above ME9, they factor it and still shows some huge numbers T_T
    @bump

    Anyone ?
    The motronic receives the signal conditioned by the trip computer with 4 impulses per revolution transmission wheel.
    This approx. complies to a frequency of 1 Hz per km/h. (Exact adjustment is performed by means of data; see
    signal conditioning AIMV).


    In the 10 ms grid a raw speed VROH is conditioned from the time difference between the two latest time entries
    delta-T = [ t(n-1) - t(n)], to which the fixed value AIMV is subject to:


    vroh w [km/h] = constant / AIMV [Imp./km] / delta-T [s]


    This value vroh w is limited into positive and negative direction by the change limitation DVFZBEG and
    stored in the RAM-cell vfzroh w.
    If delta-T becomes greater than 1 s, then vroh w is set to 0.


    With V > 0, vfzroh w is valid after 2 V-impulses.
    In the hold phase (KL 15 off) a V-acquisition is no longer performed, the V-value acquired last is preserved.


    For FGR-function vfzroh w is smoothed by a PT1-filter. The vehicle acceleration is calculated from the filtered speed
    signal.


    so AIMV is a part of a math equation and appears to be just a dividing factor


    read the screenshots I attached it breaks down the function and how it works

    - - - Updated - - -

    ALSO please refer to the FNRAD posting I have shared.... it is the calculated vehicle speed against wheel pulse


    I asked on cartechnology but why do you want to change AIMV and who told you to start looking there?



    I am curious what your end goal is

    I know you said you had an m62tu in a e30 i wanna say
    I like to pretend I know stuff

  10. #10
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    Or maybe use math from your screen shot

    if hptuner shows @ 38,721 for 19152120


    then

    38,721 / 19152120 =
    0.002021760515285


    so X * 0.002021760515285 is your factor

    (if you want your output to match the way HP tuners seems to show it)


    I could have my maths backwords but I gave it a shot
    I like to pretend I know stuff

  11. #11
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    Quote Originally Posted by zarboz View Post
    I am curious what your end goal is

    I know you said you had an m62tu in a e30 i wanna say
    DSC converts signal received from wheel magnetic ring Then sends square wave to ECU which sends to Instrument Cluster or being used in Cruise Control etc... I want to use it in e30 in which ABS output signal from sensor in rear axle shaft is square wave but with different frequency, i want to adapt my ecu to that signal

  12. #12
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    Quote Originally Posted by Kisu1337 View Post
    DSC converts signal received from wheel magnetic ring Then sends square wave to ECU which sends to Instrument Cluster or being used in Cruise Control etc... I want to use it in e30 in which ABS output signal from sensor in rear axle shaft is square wave but with different frequency, i want to adapt my ecu to that signal

    I understand more now

    I think AIMv as well as FNRAD will need to be manipulated I replied to your PM so you can inspect the function sheet for more in depth information
    I like to pretend I know stuff

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