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'searching for speedometer sensor'
1996\12\14@023642 by Mohamad Shalan

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Hello,
I am looking for a sensor that can be attached to the wheel or to the
speedometeter wire that can convert the speed into electrical signal
to be used with electronic taximeter. Pls if u have any info. let me know

urs,
shalan

1996\12\14@111455 by Dr. Craig Hollabaugh

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Mohamad Shalan <spam_OUTsharTakeThisOuTspamSHAMS.EUN.EG>
I am looking for a sensor that can be attached to the wheel or to the
speedometeter wire that can convert the speed into electrical signal
to be used with electronic taximeter. Pls if u have any info. let me know



Look  in the digikey cat for hall effect sensors.

1996\12\14@183312 by Brian Lane

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On Sat, 14 Dec 1996 10:57:12 -0500, you wrote:

> Mohamad Shalan <.....sharKILLspamspam@spam@SHAMS.EUN.EG>
>I am looking for a sensor that can be attached to the wheel or to the
>speedometeter wire that can convert the speed into electrical signal
>to be used with electronic taximeter. Pls if u have any info. let me know
>
>Look  in the digikey cat for hall effect sensors.

 This is one solution, but he would have to build the sensors
himself. A better on is a speedometer transducer. I have one that I
got with a prototype Intertial Dynomometer, but I don't know the
manufacturer. You attach it to the transmission in place of the
speedometer cable, and attach the cable to the transducer. 2 wires
come from the transducer and carry a pulse related to the speed (needs
to be calibrated in sotware for the car -- gear ratio, tire size,
etc).

 Search/check some of the automotive engineering sites. If the SAE
has a homepage that might be a starting point.

 Brian

---
 Nexus Computing        nexusspamKILLspameskimo.com        http://www.eskimo.com/~nexus

1996\12\14@211721 by Brooke

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Brian Lane wrote:
>
> On Sat, 14 Dec 1996 10:57:12 -0500, you wrote:
>
> > Mohamad Shalan <.....sharKILLspamspam.....SHAMS.EUN.EG>
> >I am looking for a sensor that can be attached to the wheel or to the
> >speedometeter wire that can convert the speed into electrical signal
> >to be used with electronic taximeter.

Mohamad:

At my local auto parts store they sell after market "cruse control"
systems.  These include a magnet which is tied to the drive shaft
(or in the case of a front wheel drive car - a half shaft) using
a long plastic tie wrap.  Also in the kit is an inductive pickup that
mounts to a metal strap using a 1/4" bolt.  The strap can be attached
using a couple of sheet metal screws.  The output is a pulse once per
turn of the shaft.  Needs to be calibrated.

Have Fun,

Brooke

1996\12\14@215950 by Bruce Bowling

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> On Sat, 14 Dec 1996 10:57:12 -0500, you wrote:
>
> > Mohamad Shalan <EraseMEsharspam_OUTspamTakeThisOuTSHAMS.EUN.EG>
> >I am looking for a sensor that can be attached to the wheel or to the
> >speedometeter wire that can convert the speed into electrical signal
> >to be used with electronic taximeter. Pls if u have any info. let me =
> know
> >
> >Look  in the digikey cat for hall effect sensors.
>

Jaguar uses a transducer which puts out 4 pulses per revolution.
You can find one on any 82 and up XJ6 and XJS.

- Bruce

--
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                Bruce A. Bowling
                Staff Scientist
  Thomas Jefferson National Accelerator Facility
   12000 Jefferson Ave - Newport News, VA 23602
                (804) 249-7240
bowlingspamspam_OUTcebaf.gov  http://devserve.cebaf.gov/~bowling
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1996\12\15@225318 by Lee Jones

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>>> I am looking for a sensor that can be attached to the wheel or to the
>>> speedometeter wire that can convert the speed into electrical signal
>>> to be used with electronic taximeter.

> A better on is a speedometer transducer. I have one that I
> got with a prototype Intertial Dynomometer, but I don't know the
> manufacturer. You attach it to the transmission in place of the
> speedometer cable, and attach the cable to the transducer. 2 wires
> come from the transducer and carry a pulse related to the speed (needs
> to be calibrated in sotware for the car -- gear ratio, tire size, etc).

I thought calibration was the job of the variable gear in the
speedometer pickoff inside the transmission.  By changing the
gear on the transmission output shaft (hard to get at) or the
gear on the speedo cable pickup (easy to do), you adjusted for
variations in rear axle gear ratio and tire size.  I know this
is how American cars up through the mid-70s worked.

I think that all speedometers/odometers expect a standard rate.
As I vaguely recall (it was a long time ago), it was 1000 RPM
at 60MPH -- please correct me if I'm wrong.  Without this, each
speedometer/odometer would have to be adjusted for the vehicle
it was installed in.  This was not an easy task when built of
mechanical assemblies using springs & magnets.  Even now with
electronic dashboards, doing this on a production line would
take too much time (i.e. be too costly).

> Search/check some of the automotive engineering sites. If the SAE
> has a homepage that might be a starting point.

Pointers to automotive technical specifications or an SAE site
would be appreciated.
                                               Lee Jones

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1996\12\16@094727 by Arvid Jedlicka

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At 07:52 PM 12/15/96 -0800, you wrote:
>I think that all speedometers/odometers expect a standard rate.
>As I vaguely recall (it was a long time ago), it was 1000 RPM
>at 60MPH -- please correct me if I'm wrong.

I also believe the 1000 revolutions per mile (note the suttle
difference between your definition and mine) was a standard.

Arvid

1996\12\16@161414 by Bruce Bowling

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> I also believe the 1000 revolutions per mile (note the suttle
> difference between your definition and mine) was a standard.
>
> Arvid
>
Yes, this is true. On many speedometer faces, one can
see this number (1000, or 1K) imprinted on it. Other
less common numbers are 980 and 1050.

- bruce


--
-----------------------------------------------------
<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
-----------------------------------------------------
                Bruce A. Bowling
                Staff Scientist
  Thomas Jefferson National Accelerator Facility
   12000 Jefferson Ave - Newport News, VA 23602
                (804) 249-7240
KILLspambowlingKILLspamspamcebaf.gov  http://devserve.cebaf.gov/~bowling
-----------------------------------------------------
<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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