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Traction Control Improvements

Discussion in 'Microblogs' started by Diamondback, Jan 24, 2019.

  1. Diamondback

    Diamondback
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    The last weeks I started looking into improving the traction control logic a little bit since @fufsgfen noticed some erratic behavior with large steering angles. Turns out there was a bug in the internal math that allowed for more wheelslip than expected, which in turn delayed TC response with large steering angles.
    The issue has been found and fixed but new developments in the vehicle area made me investigate further improvements for TC to better support AWD vehicles.

    I don't want to go too much into details at this point but the results are very promising, brake and throttle control are much more immediate now and can be tuned down to incredibly small thresholds.

    Here's a little demo:

    Video - Click to Play - Direct Link
     
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  2. CaptainZoll

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    avatar.jpg
     
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  3. CrimsonCrocodile

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    Anyone else notice that is the new electric SBR4?

    Notice ultra high revs, lack of engine sound and extreme acceleration.
     
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  4. ClassicMike

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    Electric SBR4? Amazing.
     
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  5. aljowen

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    Thank goodness for that. The ESC has been tragic since the last update. Previously it felt smooth, currently it's jittery and more or less cuts all the throttle with even the slightest turn of the wheel. Yet it does a much worse job of keeping the car from sliding out. I had to update my mods with a new ESC copied from the ETK k series since the update since the previous one they had was nigh on undrivable.

    So if it's even just as good as it has been with previous updates. Then I'm super happy to hear it's coming. If it's better then I am pretty excited.
     
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  6. Diamondback

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    Huh? that's the first time I hear about any problems since an update? The issue I've been describing above have been around since forever.
     
  7. aljowen

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    Maybe something on my end then? I will try disabling all mods and see if that changes anything. I had assumed that it was going to be a case of the old esc relying on data that it shouldn't realistically have access to, and the new one being a wip using true data. Before the Italy update I hadn't questioned the esc's performance.
    --- Post updated ---
    Never mind, false alarm, I must be misremembering something. Since it does seem fine to me now, other than as you say being very slidy in the ETK k series.
    --- Post updated ---
    So I have tested with my own mods, the ESC is misbehaving in them. So I must be misremembering from that. It's entirely possible (probable) that it is my fault for not having the esc set up correctly. It might also have something to do with that delay that you spoke of causing a spiky feedback loop.

    Here is a video:


    As you can see the throttle is held at 100% a lot of the time. The clutch is automatic. This was recorded with an xbox controller.
     
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  8. SebastianJDM

    SebastianJDM
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    yeah i've been reluctant to say anything about that since i've never gone out irl and tried doing donuts with traction turned on, so... idk how realistic that is. surely it differs massively between different cars, high vs low power, strict vs loose TC, etc.

    but i'd sure hope the car doesn't rev up and down so rapidly like that irl, it seems like that would cause more damage than just letting you spin the tires...
     
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  9. Diamondback

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    Yea that car definitely needs tuning, unfortunately it's a fairly complex topic so it's not trivial to get this stuff right... (and even less so to make some generic configuration that "just works")
    I regularly spend considerable amounts of time fine tuning our own cars.
     
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  10. aljowen

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    Looks like I got some more work to do then :p

    If you know of any guides, or documentation that describes what each value does, that would be much appreciated

    Thanks :)
     
  11. Car_Genius

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    First of all, I love that it's got a high vis jacket. Second of all, will it have adjustable regen braking? and if so, how about the strongest one using the air brake spoiler when it is activated?
     
  12. fufsgfen

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    I guess you can start with this:
    http://www.mate.tue.nl/mate/pdfs/9985.pdf
    --- Post updated ---
    For anyone interested, I put these search terms in web search and there is lot of very interesting links:
    engineering electronic stability control design
     
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  13. KiloHotel

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    God you guys are awesome, keep up the painstaking but excellent work. It is truly appreciated.
     
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  14. MrAngry

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    I'm not sure if it's related, but ABS has issues after recovering from a trail-braking scenario where it does not apply full braking power after recovery. Could you please look into this? @Diamondback

     
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  15. ast5515

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    That's interesting. I've been playing this game since the first alpha and I've never experienced this. Does it happen with other vehicles as well? Any special steps to reproduce it?
     
  16. MrAngry

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    I haven't really tried it with any other vehicles, I just swing the car out of balance and make sure that ABS straightens the car out, preferably with as little steering input as possible.
     
  17. ast5515

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    Yep, I got it. I'm using a steering wheel and I always countersteer normally. Now I tried it with a keyboard and I can replicate the problem.
     
  18. Jack The Ripper 2

    Jack The Ripper 2
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    It happens a lot with me, mostly when racing some cars with ABS, this bug makes me crash quite often.
     
  19. RobertGracie

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    @Diamondback Is that an electric SBR4, when will we get that?
     
  20. CrimsonCrocodile

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