3 ms·

Couldn't software gradually increase power to match the grip of the tires and prevent spinning? Or would that slow it down because a spinout 0-60 (not counting

by cwkoss 3y ago

Couldn't software gradually increase power to match the grip of the tires and prevent spinning? Or would that slow it down because a spinout 0-60 (not counting rollout) is faster that a "perfect throttle" 0-60?

JumpCrisscross 3y ago
> Couldn't software gradually increase power to match the grip of the tires and prevent spinning? Traction prediction is dependent on surface characteristics [1]. You need the vehicle to not only identify the surface, but also predict the vehicle-surface interface and adjust its assumptions as tyre meets road. It's worth doing. But it's noisy enough that it wouldn't be meaningful for a quoted statistic. (Disclaimer: I've only done this for aircraft on runways, and then only academically.) [1] https://www.cavs.msstate.edu/publications/docs/2018/05/15870Mason_et_al._2018_traction_wheel_sand_Terramechanics.pdf https://www.cavs.msstate.edu/publications/docs/2018/05/15870...
- FireBeyond 3y ago
  Not for take off (or not only for take off), but Audi does this on some of its high end cars (RS 7, etc.) - the vehicle is actively sensing the road, and adjusting for grip, surface, camber and problems (it can actively avoid potholes, for example).
SkyPuncher 3y ago
It can. Modern traction control will reduce power when it detects wheel slip. The problem is they choose a slightly conservative threshold, so you end up losing power. High performance almost always wants this stuff off so humans can use skill/judgment to push it to the limit.
AlotOfReading 3y ago
That works, it's called launch control. It's just not as important as it is with ICE engines if you can supply enough power to the motors. Subtracting rollout will always give a lower number though, and it's easier.
dreamcompiler 3y ago
Yes, and all Tesla cars do this.

3 ms·

Couldn't software gradually increase power to match the grip of the tires and prevent spinning? Or would that slow it down because a spinout 0-60 (not counting

by cwkoss 3y ago

JumpCrisscross 3y ago
> Couldn't software gradually increase power to match the grip of the tires and prevent spinning? Traction prediction is dependent on surface characteristics [1]. You need the vehicle to not only identify the surface, but also predict the vehicle-surface interface and adjust its assumptions as tyre meets road. It's worth doing. But it's noisy enough that it wouldn't be meaningful for a quoted statistic. (Disclaimer: I've only done this for aircraft on runways, and then only academically.) [1] https://www.cavs.msstate.edu/publications/docs/2018/05/15870Mason_et_al._2018_traction_wheel_sand_Terramechanics.pdf https://www.cavs.msstate.edu/publications/docs/2018/05/15870...
- FireBeyond 3y ago
  Not for take off (or not only for take off), but Audi does this on some of its high end cars (RS 7, etc.) - the vehicle is actively sensing the road, and adjusting for grip, surface, camber and problems (it can actively avoid potholes, for example).
SkyPuncher 3y ago
It can. Modern traction control will reduce power when it detects wheel slip. The problem is they choose a slightly conservative threshold, so you end up losing power. High performance almost always wants this stuff off so humans can use skill/judgment to push it to the limit.
AlotOfReading 3y ago
That works, it's called launch control. It's just not as important as it is with ICE engines if you can supply enough power to the motors. Subtracting rollout will always give a lower number though, and it's easier.
dreamcompiler 3y ago
Yes, and all Tesla cars do this.