🚀 go-pugleaf

In article <31487@hydra.gatech.EDU> gt0297a@prism.gatech.EDU (Tim Drury) writes:
>is there an accurate, *cheap* method of measuring vehicle speed without
>measuring off the front or rear wheels?  this is to be used in a proto-
>type traction control system on a race car.  the speed of the rear
>wheels will be compared with the true vehicle speed to determine if
>traction is lost.  since the front wheels will rotate at differing speeds
>in turns they can't be used.
>is there an easy way to use infrared doppler or something like it?
>
>-tim drury
>gt0297a@hydra.gatech.edu

Actually, in a turn, all four wheels should be rotating at different speeds if y
you are using a differential in the rear.   I think most traction control system
s monitor all four wheels, and only perform corrections when the difference is
(in wheel speeds) greater than possible without wheelslip (spin or lockup).
   Jonathan R. Lusky                   University of Texas at Austin
   lusky@ccwf.cc.utexas.edu          Society of Automotive Engineers
   (512) 471-5399              Chairman, Natural Gas Vehicle Project
   ETC 1.204F                        IRC Admin, minnie.cc.utexas.edu