I have ... another actual physics question for discussion!
(copy/paste from my question on AC forums...)
Its regarding the Electronic Brake Bias Controller we have available; The fact is I really just want to play around and experiment with it, but the way its implemented by Kunos is really confusing me and seems illogical, and would be glad of any assistance which helps explain what the logic is.
Here is an example of the controller for those who haven't seen it:
[CONTROLLER_0]
INPUT=LOAD_SPREAD_LF
COMBINATOR=ADD
LUT=(|0.4=0.70|0.5=0.65|0.6=0.70|)
FILTER=0.99
UP_LIMIT=1
DOWN_LIMIT=0.0
My first thought was to implement some sort of system that matches the braking bias to the front/rear load proportionally (disregarding any other factors for the time being, tyre grip, lateral loads, brake temps etc.), then tune it from there.
As a starting point I went with a LUT a bit like this below, thinking the values on the left is the front axle load spread (% of the load on the front axle), and the value on the right the Front Brake Bias:
0.0=0.00
0.5=0.50
1.0=1.00
This in theory would mean the braking bias always matches the load, so say in a typical braking zone, the front load would be 70%, so brake bias would also be at 70% - but in practice this was heavily locking the rears, and I'm not entirely sure why.
The best results I could achieve were by upping the brake bias by 20%, so even a 50% load spread resulted in a 70% brake bias and so on. This gave pretty even braking over both axles throughout the braking zone. So the LUT looked like this:
0.0=0.20
0.5=0.70
0.80=1.00
But the way Kunos is implementing it is more like this (not actual values, same format though):
0.4=0.70
0.5=0.65
0.6=0.70
And I just don't understand the logic - at 0.5 load (that being equal load between front and rear), the brake bias is 65%, thats fine. At 0.6 load (so the front is loaded up more than the rear, ie more grip), the brake bias is 70% front, again that makes sense.
What confuses me is when the load is 0.4 (so the rear is more loaded), the brake bias is again 70%, which makes no sense to me?!
Also, when using EBB, does this completely disregard whatever brake bias is set either in the cockpit or setup? From my testing it seems so.
I'm guessing I'm missing some crucial bit of information or understanding. If anyone can shed some light on the proper way to utilise this function, I'd appreciate the help!