In a message dated 01/21/2000 10:57:47 AM Pacific Standard Time,
> A number of cars use accelerometers, but NOT for axial deceleration
> generally. They are for lateral acceleration - i.e. cornering. The ABS
> operates slightly differently when cornering than when going straight (more
> braking on the inside wheels I think, but I could be way off base on that.
> Don't remember the specifics). Anyway, my guess based on my limited
> measurements experience is that accelerometers (or at least reasonably
> ones) are just too noisy to be used very well for axial deceleration.
As far as I know no ABS system uses accelerometers. the wheel speed sensor
uses a toothed wheel and some type of pickup (magnetic is the most common) A
magentic sensor generates a sine wave and the signal goes to an analog to
digital converter (typicaly a Schmit trigger) this A to D converter may be in
the control unit on in the sensor. The control unit is just looking at the
frequency of each wheel and calculates G force from changes in frequency of
Accelerometers are used in yaw control systems, my company car has one. I do
have one question, your comment about noisy? The sensor in my car is solid
state and as such is stone silent. How do the ones in your experience work?