[Main General Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos Re: Must have been a bummer when ABS was introduced. Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by CrNiFe [Email] (#408) [Profile/Gallery] (more from CrNiFe) on Tue, 21 Feb 2006 12:57:50 In Reply to: Must have been a bummer when ABS was introduced., Jimbo, Tue, 21 Feb 2006 10:58:23 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

The skid marks, as you indirectly point out, are a sign that the wheels have locked up and that the tire are no longer rotating, hence the big black marks on the road.

ABS definitely complicates the analysis, but nonetheless, skid marks can give you a lower bound for the speed analysis and the distance the brakes were fully applied - you can still lock up, between pulses and with enough effort.

With ECS, traction control or ESP, it will be even more complicated - but we may eventually get information on yaw pitch and roll rates that are used to deploy the secondary air bags.

The newer models of CDR record the following in GM vehicles, which can be interpreted by the Vetronix software:

Pre-Crash Graph

· Vehicle speed (MPH) 5 seconds before algorithm enable.

· Engine speed (RPM) 5 seconds before algorithm enable.

· Percent throttle 5 seconds before algorithm enable.

· Brake switch circuit status (On/Off) 5 seconds before algorithm enable.

Data Summary Information

· Driver’s seat belt status (Buckled/Unbuckled).

· SIR warning lamp status (On/Off).

· Time from algorithm enable to deployment command (msec).

· And more…

Crash Pulse Graph: SDM Recorded Velocity Change

· Plots change in forward velocity (MPH) versus time for 150 msec after algorithm enable.

There is a lot of other information on the Vehicle ECU, especially on commercial tractor units, which can tell the position of the clutch, the gear selected, and so on.

I checked my list for 2005 vehicles supported, but SAAB wasn't on it.

Cheers,
CrNiFe
Toronto

• So-called "black boxes" in Saabs? For real?, turrbo , Mon, 20 Feb 2006 12:39:13
  • Re: So-called "black boxes" in Saabs? For real?, CrNiFe , Tue, 21 Feb 2006 09:37:20
    • Must have been a bummer when ABS was introduced., Jimbo, Tue, 21 Feb 2006 10:58:23
      • Re: Must have been a bummer when ABS was introduced., CrNiFe , Tue, 21 Feb 2006 12:57:50 <-- Viewing This Message
  • Re: So-called "black boxes" in Saabs? For real?, buck, Mon, 20 Feb 2006 16:24:52
    • Re: So-called "black boxes" in Saabs? For real?, saw, Mon, 20 Feb 2006 17:31:09
      • you're right - more info on Vertronix, turbosaab , Mon, 20 Feb 2006 17:44:16
        • Pretty creepy, turrbo , Mon, 20 Feb 2006 17:59:31
          • Re: Pretty creepy, carob, Tue, 21 Feb 2006 13:10:52
  • Calif privacy laws......., Mike Lynch , Mon, 20 Feb 2006 16:08:20
  • Absolutely. In fact, SAAB was one of the first, turbosaab , Mon, 20 Feb 2006 13:14:12
    • Re: Absolutely. In fact, SAAB was one of the first, AeroInCO, Mon, 20 Feb 2006 15:46:48
      • I read an advertisement for a "Black Box Smoker", Jimbo, Tue, 21 Feb 2006 07:04:50

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