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Hall Effect - Driveshaft

M

mpm

Jan 1, 1970
0
Anyone ever use a Hall Effect device on a Universal Joint (as opposed
to a drive shaft)? I need to know vehicle speed & direction, and
honestly, I probably won't engineer it this way anyway... but I told
my partner I would ask around.... I would be curious to know how
this worked, or didn't work, as I'm sure many have tried. (?)
Thanks. -mpm
 
V

Vladimir Vassilevsky

Jan 1, 1970
0
mpm said:
Anyone ever use a Hall Effect device on a Universal Joint (as opposed
to a drive shaft)? I need to know vehicle speed & direction, and
honestly, I probably won't engineer it this way anyway... but I told
my partner I would ask around.... I would be curious to know how
this worked, or didn't work, as I'm sure many have tried. (?)

I tried to do that. It works, however it is not reliable.

1. The crap gets caught between the shaft and the sensor, so the sensor
will be broken eventually.

2. There could be a big amount of mechanical play in the position of the
nocles of the U-joint, so the sensor has to mounted quite far from the
shaft.



Vladimir Vassilevsky

DSP and Mixed Signal Design Consultant

http://www.abvolt.com
 
J

John Tserkezis

Jan 1, 1970
0
mpm said:
Anyone ever use a Hall Effect device on a Universal Joint (as opposed
to a drive shaft)? I need to know vehicle speed & direction, and
honestly, I probably won't engineer it this way anyway... but I told
my partner I would ask around.... I would be curious to know how
this worked, or didn't work, as I'm sure many have tried. (?)

It was recommended to us for it to be placed towards the end of the drive
shaft that didn't move as much (gearbox end rather than the diff. end).

I wouldn't put it on the universal joint itself, you don't get good mounting
opportunities that way.

The one that I did was placed as far up the shaft as it could, but was
eventually "misplaced" by a flying blow-up rubber doll.

Don't ask.
 
M

Mick

Jan 1, 1970
0
John said:
It was recommended to us for it to be placed towards the end of the
drive shaft that didn't move as much (gearbox end rather than the diff.
end).

I wouldn't put it on the universal joint itself, you don't get good
mounting opportunities that way.

The one that I did was placed as far up the shaft as it could, but was
eventually "misplaced" by a flying blow-up rubber doll.

Don't ask.
The doll got too close to being shafted eh?
Mick C
 
J

John Tserkezis

Jan 1, 1970
0
Mick said:
The doll got too close to being shafted eh?

No, it was well and truly shafted. Wrapped around so tightly it had to be
cut off the drive shaft.
 
J

Jasen Betts

Jan 1, 1970
0
Anyone ever use a Hall Effect device on a Universal Joint (as opposed
to a drive shaft)? I need to know vehicle speed & direction, and
honestly, I probably won't engineer it this way anyway... but I told
my partner I would ask around.... I would be curious to know how
this worked, or didn't work, as I'm sure many have tried. (?)

It's knobbly enough, it should work...

speedometer encoder no good? If the speedo is mechanical perhaps a
hall effect sensor could be put inside the speedo case? (since there's
already a magnet there)

How about a hall sesnsor, or reluctor on the teeth of the crown (or
instead pinion) gear (in the diff) - you'd be less succeptible to
road debris inside the diff case.

ABS sensors are another possibility if fitted.

would monitoring the reverse lamp give accurate enough direction
information?

Bye.
Jasen
 
R

Rich Grise

Jan 1, 1970
0
It was recommended to us for it to be placed towards the end of the drive
shaft that didn't move as much (gearbox end rather than the diff. end).

I wouldn't put it on the universal joint itself, you don't get good mounting
opportunities that way.

The one that I did was placed as far up the shaft as it could, but was
eventually "misplaced" by a flying blow-up rubber doll.

Don't ask.

Don't ask, don't tell?

;-)
Rich
 
J

John Tserkezis

Jan 1, 1970
0
Don't ask, don't tell?

In a manner of speaking. :)


It was my brother-in-law's car, (well before he was officially my brother in
law anyway) and it took many, many years before I managed to get the (albeit
brief) explanation out of him.

It started after he made changes in the drive train ratio as well as wheel
sizes that threw the existing speedo so far out it was useless. He
commissioned me to build a digital speedo, so I did, with a magnet on the
drive shaft (which is where all this started).

And that's where it stood, till about six months later where he said it
"stopped working".

A little casual observation noted the metal arm the pickup sensor was on,
was mangled beyond recognition, the cable was pulled apart, and of course, the
pickup was no longer near the magnet anyway.

It didn't look like it bottomed out anywhere (the likely problem), so I was
at a loss as to what could do this type of damage. So I asked.

A bit of vague non-descript running over a plastic bag resulted.

Yeah, I didn't believe that either, and it was obvious he was trying to hide
something. I stopped caring about what did the damage, and instead was now
more interested in why he was being so evasive.

Fast forward many years, where after repeated questioning, the subject
eventually let up: In an attempt to reduce noise coming in around the
gearstick cavity, he stuffed (his words) "a rubber doll" in the hole.
Said "rubber doll" came loose, fell down, wrapped around the driveshaft,
flapping around killing the magnetic pickup, where it left him stranded by the
side of the road till he cut it loose with a knife.

To this day, he still hasn't been clear on the _exact_ nature of the type of
"rubber doll", other than it used to belong to his brother. Of course...

And we still rib him about it every so often. :)
 
M

Michael A. Terrell

Jan 1, 1970
0
John said:
To this day, he still hasn't been clear on the _exact_ nature of the type of
"rubber doll", other than it used to belong to his brother. Of course...


Maybe his brother was "Bud Bundy"?


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
J

John Tserkezis

Jan 1, 1970
0
Maybe his brother was "Bud Bundy"?

Unlikely, I know his brother quite well. Ultimately we may never find out.
He's being quite evasive about it still, and even immediately afterwards, he
said he hadn't removed all of the "rubber doll", and pieces of it were still
wrapping around the drive shaft a little later.
Since then, he claims to have completely removed it eventually. It is not
known if he kept any pieces for keepsakes. (we "ask" but he claims not to).
 
M

Michael A. Terrell

Jan 1, 1970
0
John said:
Unlikely, I know his brother quite well. Ultimately we may never find out.
He's being quite evasive about it still, and even immediately afterwards, he
said he hadn't removed all of the "rubber doll", and pieces of it were still
wrapping around the drive shaft a little later.
Since then, he claims to have completely removed it eventually. It is not
known if he kept any pieces for keepsakes. (we "ask" but he claims not to).


It was a reference to the old Fox TV show, "Married, with Children"

<http://www.google.com/search?source...YA:2006-31,GWYA:en&q=Bud+Bundy+blowup+-arrest>


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
J

John Tserkezis

Jan 1, 1970
0
Michael said:
It was a reference to the old Fox TV show, "Married, with Children"

I know, I used to watch it when it was on years ago.

I don't recall either of the brothers mentioning the name "Isis". :)

Though, it would have been creepy if they did...
 
M

Michael A. Terrell

Jan 1, 1970
0
John said:
I know, I used to watch it when it was on years ago.

I don't recall either of the brothers mentioning the name "Isis". :)

Though, it would have been creepy if they did...



Maybe that's the reason he didn't want to tell you what really
happened? ;-)


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
M

mpm

Jan 1, 1970
0
Maybe that's the reason he didn't want to tell you what really
happened? ;-)

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

So basically what I'm hearing is if I engineer a magnet on the
driveshaft, we have to make sure to mention in the User's Manual not
to stuff rubber dolls down holes in the gear shift mechanism.....

Oh, and that Bud Bundy can't ride as a passenger in the cab.

-mpm
 
M

Michael A. Terrell

Jan 1, 1970
0
mpm said:
So basically what I'm hearing is if I engineer a magnet on the
driveshaft, we have to make sure to mention in the User's Manual not
to stuff rubber dolls down holes in the gear shift mechanism.....


Imagine the kind of customers you'd get if you suggest that they DO
stuff blowup dolls in the holes. ;-)

Oh, and that Bud Bundy can't ride as a passenger in the cab.


I thought Bud was still in jail?


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
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