Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Tuning the TC
08-30-2007, 11:33 PM,
#35
 
cotharyus Wrote:Now I suppose the next question is this - does VDrift's ABS work individually on all four wheels, or if one wheel locks up does it back off on all four corners at the same time?

VDrift's ABS works individually on all four wheels. When the tire starts slipping more than is optimal, the brake pressure to the wheel is set to zero; when the tire is slipping less than is optimal, the brake pressure is reset to the driver commanded value. The ABS was written by me and wasn't originally part of vamos, so I know a lot about it.

I'm not sure why you guys are worried about the ABS -- are you just concerned because the wheels don't get to the point that they skid until you're moving slowly? Because that's desired behavior -- a perfect ABS system shouldn't ever lock up the wheels. At lower speeds this happens because the VDrift ABS controller can't modulate the brake pressure fast enough to avoid it (the wheels lock up too quickly).

The purpose of the ABS (and TCS, in the opposite direction) is to keep the tire applying its maximum force. When the wheel locks up it's applying very little force relative to its maximum, and it takes a while for the wheel to spin back up to the speed it needs to be at to apply maximum force, so having it lock up is bad. I can get into more detail about this if anyone's interested.
Reply


Messages In This Thread
Tuning the TC - by xTs - 08-23-2007, 12:55 PM
[No subject] - by cotharyus - 08-23-2007, 01:31 PM
[No subject] - by xTs - 08-23-2007, 02:51 PM
[No subject] - by cotharyus - 08-23-2007, 07:56 PM
[No subject] - by joevenzon_phpbb2_import3 - 08-23-2007, 08:02 PM
[No subject] - by cotharyus - 08-23-2007, 08:12 PM
[No subject] - by joevenzon_phpbb2_import3 - 08-24-2007, 12:33 AM
[No subject] - by xTs - 08-24-2007, 04:16 AM
[No subject] - by xTs - 08-26-2007, 12:58 PM
[No subject] - by cotharyus - 08-26-2007, 09:22 PM
[No subject] - by xTs - 08-27-2007, 03:11 AM
[No subject] - by cotharyus - 08-27-2007, 01:42 PM
[No subject] - by joevenzon_phpbb2_import3 - 08-27-2007, 11:46 PM
[No subject] - by cotharyus - 08-28-2007, 09:25 AM
[No subject] - by joevenzon_phpbb2_import3 - 08-28-2007, 10:56 PM
[No subject] - by xTs - 08-29-2007, 03:26 AM
[No subject] - by cotharyus - 08-29-2007, 07:52 AM
[No subject] - by kidrock - 08-29-2007, 02:37 PM
[No subject] - by xTs - 08-29-2007, 05:47 PM
[No subject] - by kidrock - 08-29-2007, 05:52 PM
[No subject] - by joevenzon_phpbb2_import3 - 08-29-2007, 10:00 PM
[No subject] - by kidrock - 08-30-2007, 12:20 AM
[No subject] - by xTs - 08-30-2007, 03:12 AM
[No subject] - by cotharyus - 08-30-2007, 08:35 AM
[No subject] - by kidrock - 08-30-2007, 09:23 AM
[No subject] - by cotharyus - 08-30-2007, 10:51 AM
[No subject] - by kidrock - 08-30-2007, 10:54 AM
[No subject] - by xTs - 08-30-2007, 11:15 AM
[No subject] - by kidrock - 08-30-2007, 11:20 AM
[No subject] - by xTs - 08-30-2007, 01:06 PM
[No subject] - by kidrock - 08-30-2007, 04:12 PM
[No subject] - by xTs - 08-30-2007, 04:21 PM
[No subject] - by kidrock - 08-30-2007, 06:42 PM
[No subject] - by cotharyus - 08-30-2007, 09:21 PM
[No subject] - by joevenzon_phpbb2_import3 - 08-30-2007, 11:33 PM
[No subject] - by xTs - 08-31-2007, 03:22 AM
[No subject] - by cotharyus - 08-31-2007, 07:50 AM
[No subject] - by kidrock - 08-31-2007, 08:25 AM
[No subject] - by xTs - 08-31-2007, 11:16 AM
[No subject] - by kidrock - 08-31-2007, 11:19 AM
[No subject] - by cotharyus - 08-31-2007, 12:14 PM
[No subject] - by xTs - 08-31-2007, 01:50 PM
[No subject] - by cotharyus - 08-31-2007, 08:25 PM
[No subject] - by joevenzon_phpbb2_import3 - 09-01-2007, 12:54 AM
[No subject] - by xTs - 09-01-2007, 05:37 AM
[No subject] - by cotharyus - 09-01-2007, 08:30 AM
[No subject] - by joevenzon_phpbb2_import3 - 09-01-2007, 10:09 AM
[No subject] - by xTs - 09-01-2007, 10:31 AM

Forum Jump:


Users browsing this thread: 1 Guest(s)