Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-20-2002, 07:16 PM
Registered User
 
Join Date: Apr 2002
Posts: 3,469
Hall Effect Sensor- how does it work?

In my University Physics II class (Electricity and magnetism) we are studying magnetism currently, and the instructor started to go over the "hall effect." I know that mercedes have a hall effect sensor on the back of the spedometer to regulate the cruise control. So I asked him after class if he knew how it worked or anything and he didnt. I was wondering if anyone here thats Electrically inclined knows how it works. He said if I bring in a spedometer he can figure it out, but I want to know, then I can share to the class that we are studying things that actually relate to real everyday life and maybe I can get some bonus points.

I have a spedometer from a w123 1982 300d that I took apart, so I can post pictures or anything anyone needs to help me explain. Thanks, Austin
__________________
No Benzes in the stable at the moment, but itching for one again.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold
etc.
Reply With Quote
  #2  
Old 10-20-2002, 07:33 PM
M D Nugent
Guest
 
Posts: n/a
I believe the Hall effect happens inside the transmission. A rotor (with three arms, I think) on the output shaft spins near a pickup coil which generates a signal for the speedometer (in 560 SL/SEL/SECs, anyway).

All you see on the back of the speedo is four male electrical connectors (12v+, ground, signal FROM the trans, and signal TO the cruise control).

Another device that uses the same principle is the Pertronix ignition (which replaces mechanical points). A rotor with small magnets along the periphery replaces the stock rotor, and each time a magnet goes by the pickup, a small electrical current is created.

Think of the Hall effect in these applications as a small pulsed example of the phenomenon that makes a generator generate DC current.

M D "Doc" Nugent
Reply With Quote
  #3  
Old 10-22-2002, 01:44 AM
Registered User
 
Join Date: Apr 2002
Posts: 3,469
pic

pic
Attached Thumbnails
Hall Effect Sensor- how does it work?-mvc-002f.jpg  
__________________
No Benzes in the stable at the moment, but itching for one again.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold
etc.
Reply With Quote
  #4  
Old 10-22-2002, 01:45 AM
Registered User
 
Join Date: Apr 2002
Posts: 3,469
2

the black part is the hall effect sensor, and the bronze piece is for the speedometer cable.
Attached Thumbnails
Hall Effect Sensor- how does it work?-mvc-002f.jpg  
__________________
No Benzes in the stable at the moment, but itching for one again.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold
etc.
Reply With Quote
  #5  
Old 10-22-2002, 01:49 AM
Registered User
 
Join Date: Apr 2002
Posts: 3,469
hall effect

hall
Attached Thumbnails
Hall Effect Sensor- how does it work?-mvc-008f.jpg  
__________________
No Benzes in the stable at the moment, but itching for one again.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold
etc.
Reply With Quote
  #6  
Old 10-22-2002, 01:49 AM
Registered User
 
Join Date: Apr 2002
Posts: 3,469
hall

hall
Attached Thumbnails
Hall Effect Sensor- how does it work?-mvc-007f.jpg  
__________________
No Benzes in the stable at the moment, but itching for one again.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold
etc.
Reply With Quote
  #7  
Old 10-22-2002, 01:50 AM
Registered User
 
Join Date: Apr 2002
Posts: 3,469
close up

close up of the hall effect sensor, the bronze colored tab goes into and rides on the circular disc which is turned by the spedometer cable, then it has some coils on the inside. maybe this will clear up what I am talking about. Thanks for your help.
Attached Thumbnails
Hall Effect Sensor- how does it work?-mvc-006f.jpg  
__________________
No Benzes in the stable at the moment, but itching for one again.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold
etc.
Reply With Quote
  #8  
Old 10-22-2002, 05:08 AM
190dee's Avatar
Registered User
 
Join Date: Dec 2001
Location: Finland
Posts: 160
I gave you a fiver!

Damn! Good thread, omegabenz! I really like when people actually share stuff like this on the forums.

Hope you figured out about the hall effect...Now it's my turn
__________________
'87 MBenz 190E 2,3 8vlv
Reply With Quote
  #9  
Old 10-22-2002, 06:22 AM
David C Klasse's Avatar
CheFrac is Back!
 
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
I believe Hall effect sensors are also used in EXPRESS (ie "One-Touch Up/Dn) Windows.
__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
Reply With Quote
  #10  
Old 10-22-2002, 06:26 PM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The W201 (190E) uses a hall effect but the pictures that are posted are on an INDUCTIVE style pick-up.
Hall effect is an on/off signal needing a voltage supply while the inductive(pictured) supplies A/C voltage.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 06:42 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page