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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: inductive speed sensor .. how they work?
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Wed, 22 October 2003 13:24
 
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Where did you get the speed sensor in the first picture? Did you get any information on it at all?
The bobbin with the wire wound around it is just inductor(derrr  ) and when the magnets sweep past it the inductor creates a voltage(nothing special)!
One thing that might be an issue using that speed sensor in the picture is the calibration is going to be out of wack because of the gearing! Can that speedo be calibrated somehow?
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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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Re: inductive speed sensor .. how they work?
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Wed, 22 October 2003 23:37
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yeah the speedo can easily be calibrated
and the speedo sender is from a gt4
cool1 since u have a gt4(well half of one) maybe you could trace them for me 
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Location:
PNG
Registered:
June 2002
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Re: inductive speed sensor .. how they work?
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Thu, 23 October 2003 02:35
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Craig
For my cruise control and for the speed sensor for the ecu I have a magnet on the tailshaft (on the yoke actually) with a pickup attached to the extension housing of the gearbox. (puts out a 5volt ragged square wave) It has been there for 4 years now and has given no trouble at all. I have also attached these to a landcruiser and a Camira over the years with great success.
If you don't like this, make a visit to your local assessories supplier - as VDO do a great electronic speedo that comes with a box that connect to the gearbox drive. This can be done a number of was depending on application - directly into the box or with a short cable. Yo may be able to by the 'box' and stuff. Not sure how much but as the whole speedo costs about $400 the bits and pieces will be less. On the topic of the speedo - it is great - self calibrating and looks good.
Craig
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: inductive speed sensor .. how they work?
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Thu, 23 October 2003 06:40
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| Oz_Craig wrote on Thu, 23 October 2003 09:37 |
yeah the speedo can easily be calibrated
and the speedo sender is from a gt4
cool1 since u have a gt4(well half of one) maybe you could trace them for me
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The gear box from my half cut is now gone  The speed sensor was a bit different to the one in your picture, but I will have a look in the GT4 manual for you!
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Location:
Perth
Registered:
September 2002
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Re: inductive speed sensor .. how they work?
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Thu, 23 October 2003 07:47
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at a quick guess, one of those wires will be the inductive sensor
i know my cressida has one built into the back of the speedo.
pulses 4 times for every rotation of the cable.
tho i dunno if you car will have it, i think only cars with computer controlled auto's and/or cruise control options had them.
one will prolly be an earth, but the other ??!?!?!
drop an analogue multimetre across 2 wires, and spin the gear.
try this will all the wires, this will tell you which ones are the inductive sensor
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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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Location:
adelaide
Registered:
August 2003
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Re: inductive speed sensor .. how they work?
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Thu, 23 October 2003 12:04
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This may not be of any use to you but.... on my toyota powered clubman style car I use an electronic speedo/trip meter etc made for use on bicyles ( yes the pedal type!! ) ... they are very tricky little units and some read up to 200kph I think from memory. Mine has about 4 or 5 functions/read-outs and cost about $39.
I put the small magnet on the tailshaft with a similar weight on the opposite side, and then put the sensor next to it. It is calibrated manually from the tyre size and diff ratio.
reagrds kevin.
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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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Re: inductive speed sensor .. how they work?
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Thu, 23 October 2003 12:06
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ok just got the multimeter out
between blue wire/ brown dot and red wire there is a resistance of 11.0
nothing between any of the others
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Location:
Perth
Registered:
September 2002
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Re: inductive speed sensor .. how they work?
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Thu, 23 October 2003 13:18
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| Oz_Craig wrote on Thu, 23 October 2003 20:06 |
ok just got the multimeter out
between blue wire/ brown dot and red wire there is a resistance of 11.0
nothing between any of the others
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and when u turn it?
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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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Re: inductive speed sensor .. how they work?
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Thu, 23 October 2003 13:41
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doesnt appear to change but maybe i cant turn it fast enuff
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Location:
Perth
Registered:
September 2002
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Re: inductive speed sensor .. how they work?
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Thu, 23 October 2003 14:07
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nah, if it will deflect, it will be non-conductive for 85 degrees rotation, conductive for 5, non-conductive for another 85, conductive for 5, etc etc, upto 360 degrees rotation
(or it could be the opposite)
you will really need an analogue multimetre for this, its easier to see the deflection of a needle, than see a digit change
have you tried it will all 3 possible combinations?
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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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Re: inductive speed sensor .. how they work?
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Fri, 24 October 2003 00:48
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| Cressida Supra wrote on Fri, 24 October 2003 00:07 |
nah, if it will deflect, it will be non-conductive for 85 degrees rotation, conductive for 5, non-conductive for another 85, conductive for 5, etc etc, upto 360 degrees rotation
(or it could be the opposite)
you will really need an analogue multimetre for this, its easier to see the deflection of a needle, than see a digit change
have you tried it will all 3 possible combinations?
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as i turn it it seems to go up or down .01 each way with a range of about 8, mainly stays on 10.90
what ya saying makes sence but dont seem to be working on this model
dont have a analoge multimeter anymore 
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Location:
Perth
Registered:
September 2002
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Re: inductive speed sensor .. how they work?
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Fri, 24 October 2003 01:44
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oh well, its out of my league now, back to shanes help
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Location:
sydney
Registered:
March 2003
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Location:
Montrose, VIC
Registered:
May 2002
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Re: inductive speed sensor .. how they work?
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Fri, 24 October 2003 02:40
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I daresay that sensor *probably* has a hall effect sensor in it (I've never pulled on apart though!) which will output a square wave rather than a sine - this MAY not be a problem, however. What you really need to do is get ahold of a CRO and have a look at exactly what comes out of the sender, then fire off an email to Silicon Chip mag and see if they can help you 
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: inductive speed sensor .. how they work?
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Fri, 24 October 2003 03:31
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Or send the sensor to someone and let them figure it out!
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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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Re: inductive speed sensor .. how they work?
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Fri, 24 October 2003 03:42
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Mr Shin i think you are right, i was looking a autometers range and they work on a halleffect device
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Location:
Menai area of Sydney
Registered:
June 2003
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Re: inductive speed sensor .. how they work?
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Fri, 24 October 2003 04:24
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To check which wires are the sensor, change the multimeter to the lowest range of DC volts you can - not resistance. The resistance seems to be about 11ohms but it's the voltage output you are after.
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Location:
ACT
Registered:
July 2002
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Re: inductive speed sensor .. how they work?
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Fri, 24 October 2003 07:22
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Yeah the 3 wire sensors are basically a magnetic sensor with an op amp build in to turn the wave from an AC signal into a DC square wave output (or hall effect output is there common name).
Can you pull your sensor apart and look inside it. If can could take a clear photo of it I could help.
I assume none of the wires is grounded? Check by measuring the resistance of the wires to the case of the sensor. If you get a short then this will be your ground wire.
Now there should be some resistance between the other 2 wires, to be honest I would expect around 2K ohms but yours doesn't seem to follow the Toyota sensors I have used.
You will need 12V on one wire and the other will be your signal - I would apply 12V to one of the wires through a 100K resistor and measure the output to see if this works. If it doesn't switch them around and try again. Of course I have assumed you have worked out which is the ground wire, if you haven't then there are a few more tries in order. If you can't work it out you can send it to me and i'll do it for you.
Now if you can work it out and get it going send me the schematic of the Speedo and I'll give you the adjustments you need to make to meet its input requirements. This will need to be changed because they are setup for the magnetic input. Should only be a matter of changing a few resistor values.
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inductive speed sensor .. how they work?
