ABS/tire lock telemetry

William Levra-Juillet · Oct 8, 2022

Lazza said: ↑

As @Kevin I think is approaching this from the telemetry point of view, I don't think he'll mind me chiming in here as a plugin developer.

The plugin inputs you'll need, via the plugin interface:
Brake pedal position (%) (probably best to use filtered, in case it deviates from unfiltered, but might need to test which is correct in that scenario)
Rear brake bias (%)
Brake pressure (%) FL, FR, RL, RR

From a quick 2 min test, I think that's it. The game appears to automatically scale the setup brake pressure. (I thought brake pressure would scale with setup max brake percentage - but I just tested with 80% in the setup and it seems not. That makes it even easier!)

At 100% brake position, the brake pressures will match the brake bias. So if your rear brake bias is 54% (46:54), your brake pressures will read 0.46, 0.46, 0.54, 0.54. As your brake position lowers from 100%, the 'full' pressure for each wheel will scale down accordingly. So what you want to detect is when the pressure is lower than that max figure - that means ABS is kicking in. Here's a graph to illustrate:

View attachment 48031

You can see the brake pressure at various wheels is lowering from their 'full' position, scaled to the brake pedal position. Just detect that, possibly with a little 'deadzone' to avoid any rounding getting picked up, and you should be good. Up to you how you handle individual wheels vs both front or both rear (some cars won't do individual wheel ABS, though I guess most will).
Click to expand...

Thank you so much @Lazza for the clear explanations!!! That sounds almost too easy

delapecs · Jul 2, 2023

Sorry to revive the thread but the SIM3d rumble kit has already arrived.
Has anyone got any progress on this issue?
Greetings

Lazza · Jul 2, 2023

delapecs said: ↑

Sorry to revive the thread but the SIM3d rumble kit has already arrived.
Has anyone got any progress on this issue?
Greetings
Click to expand...

Since that kit uses SimHub data, you should point someone at SimHub to this thread, and possibly another I don't have a link to right now, in order to determine when the wheels are locking and slipping. If they haven't already they should be looking to calculate this themselves from existing telemetry data - if they say the data isn't available, please point them here.

raymond2_nl · Sep 22, 2023

Has anyone tried this: https://github.com/viper4gh/SimHub-Plugin-CalcLngWheelSlip?

I will play around with it coming weekend, see if it works...

Log in or Sign up

ABS/tire lock telemetry

William Levra-Juillet Registered

delapecs Registered

Lazza Registered

raymond2_nl Registered

Share This Page

Log in or Sign up

ABS/tire lock telemetry

William Levra-Juillet Registered

delapecs Registered

Lazza Registered

raymond2_nl Registered

Share This Page

Useful Searches