ABS
David Kraft
dkraft at mindspring.com
Wed Jan 29 16:25:23 GMT 1997
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My Grand Cherokee has toothed wheels, with a proximity sensor(like the
vw, and every other ABS I have seen.)
It is interesting that I have had it axle deep in soft silt clay, and
the ABS wouldn't malfunction. It is a pretty neat experience having some
smidgen of control on super slick mud...
The shop manual says that the ABS stops functioning below 3 mph, which
I can verify from a hard brake on dry pavement from 30 mph.
Because the beast is so heavy, the wheels will lock up when the ABS
stops compensating in the last 2 feet or so, and you get a nice chirp
from two or three of the wheels.
I can't think of a reason to hack it, except to turn it into positive
traction control.
Regards,
D.
Jens Stobernack wrote:
>
> On Wed, 29 Jan 1997, Mike Turner wrote:
>
> >
> > I was one of the people affected by the server glitch and never
received any
> > replies (maybe there were none.....), so I'm going to ask again....
> > >>>I know this is an EFI group but ...... What type of sensor does
Bosch ABS
> > use for rotation? Hall effect? Proximity? Something else? Does
anyone know
> > what the minimum speed for ABS to be engaged is? Has anyone hacked
> > one of these?<<<
> >
>
> I can only speak from VW experience. There is a toothed wheel
> on the brake hub of each wheel. It spins with the wheel. An inductive
> pickup sensor seats mm from the wheel, connected to a static part of
> the car. I think the ABS is always on. Even at slow speeds on ice you
> can engage it.
>
> Hope this helps,
> Jens
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<DT>My Grand Cherokee has toothed wheels, with a proximity sensor(like
the vw, and every other ABS I have seen.)</DT>
<DT>It is interesting that I have had it axle deep in soft silt clay,
and the ABS wouldn't malfunction. It is a pretty neat experience having
some smidgen of control on super slick mud...</DT>
<DT>The shop manual says that the ABS stops functioning below 3 mph, which
I can verify from a hard brake on dry pavement from 30 mph.</DT>
<DT>Because the beast is so heavy, the wheels will lock up when the ABS
stops compensating in the last 2 feet or so, and you get a nice chirp from
two or three of the wheels.</DT>
<DT> </DT>
<DT>I can't think of a reason to hack it, except to turn it into positive
traction control.</DT>
<DT> </DT>
<DT> </DT>
<DT> </DT>
<DT>Regards, </DT>
<DT>D.</DT>
<DT> </DT>
<DT> </DT>
<DT> </DT>
<DT>Jens Stobernack wrote:<BR>
> <BR>
> On Wed, 29 Jan 1997, Mike Turner wrote:<BR>
> <BR>
> ><BR>
> > I was one of the people affected by the server glitch and never
received any<BR>
> > replies (maybe there were none.....), so I'm going to ask again....<BR>
> > >>>I know this is an EFI group but ...... What type
of sensor does Bosch ABS<BR>
> > use for rotation? Hall effect? Proximity? Something else? Does
anyone know<BR>
> > what the minimum speed for ABS to be engaged is? Has anyone hacked<BR>
> > one of these?<<<<BR>
> ><BR>
> <BR>
> I can only speak from
VW experience. There is a toothed wheel<BR>
> on the brake hub of each wheel. It spins with the wheel. An inductive<BR>
> pickup sensor seats mm from the wheel, connected to a static part
of<BR>
> the car. I think the ABS is always on. Even at slow speeds on ice
you<BR>
> can engage it.<BR>
> <BR>
> Hope this helps,<BR>
> Jens<BR>
</DT>
</BODY>
</HTML>
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