Pedal assembly for a vehicle including a non-contact position sensor
The subject invention provides a pedal assembly ( 10, 110, 210 ) for a vehicle and a non-contact position sensor ( 22 ). The pedal assembly ( 10, 110, 210 ) includes a bracket ( 12. 112, 212 ) and a pedal arm ( 14, 114, 214 ). A pivot ( 16 ) supports the pedal arm ( 14, 114, 214 ) for pivotal movement about a pivot axis A. The pivot ( 16 ) includes a fixed element ( 18 ) and a rotatable element ( 20 ). The rotatable element ( 20 ) is rotatable relative to the fixed element ( 18 ) about the pivot axis A. The position sensor ( 22 ) is disposed on the pivot axis A. The position sensor ( 10, 110, 210 ) includes a magnetic flux sensor ( 24 ) that is supported by one of the elements ( 18, 20 ) on the pivot axis A. First ( 26 ) and second ( 28 ) magnetic poles are supported by the other of the elements ( 18, 20 ). The magnetic poles ( 26, 28 ) present opposing surfaces ( 30, 32 ) of opposite magnetic polarity. The poles ( 26, 28 ) are in spaced and parallel relationship and are on opposite sides of the pivot axis A to create substantially uniform flux density B over a predetermined distance D parallel to the surfaces ( 30, 32 ) of the magnetic poles ( 26, 28 ).
1 . A pedal assembly for a vehicle comprising:
a bracket for attachment to the vehicle;
a pedal arm;
a pivot supporting said pedal arm for pivotal movement relative to said bracket about a pivot axis and including a fixed element and a rotatable element rotatable relative to said fixed element about said pivot axis in response to the pivotal movement of said pedal arm;
a magnetic flux sensor supported by one of said elements;
first and second magnetic poles supported by the other of said elements
said flux sensor disposed between said first and second magnetic poles presenting opposing surfaces of opposite magnetic polarity;
said assembly characterized by said first and second magnetic poles disposed in spaced and parallel relationship to one another for creating substantially uniform flux density over a predetermined distance parallel to said surfaces of said magnetic poles.
2 . A pedal assembly as set forth in claim 1 wherein said opposing surfaces are straight and create substantially parallel lines of magnetic flux between said surfaces along said predetermined distance.
3 . A pedal assembly as set forth in claim 2 wherein said substantially uniform flux density is further defined as a difference in flux density of no more than 1500 Gauss throughout said predetermined distance.
4 . A pedal assembly as set forth in claim 3 wherein said substantially uniform flux density is further defined as a flux density in the range of from 2000 to 3500 Gauss throughout said predetermined distance.
5 . A pedal assembly as set forth in claim 3 wherein said flux sensor has a face that presents a straight longitudinal axis.
6 . A pedal assembly as set forth in claim 5 wherein said face is perpendicular to said opposing surfaces.
7 . A pedal assembly as set forth in claim 6 wherein each of said opposing surfaces extends a length at least equal to said space between said opposing surfaces.
8 . A pedal assembly as set forth in claim 7 wherein said flux sensor is on said pivot axis and said predetermined distance is on either side of said pivot axis.
9 . A pedal assembly as set forth in claim 8 wherein said predetermined distance is further defined as a distance at least equal to a length of said flux sensor.
10 . A pedal assembly as set forth in claim 9 wherein said first and second magnetic poles are further defined as first and second magnets.
11 . A pedal assembly as set forth in claim 10 wherein said other of said elements comprises a rotor coaxial with said pivot axis and having an inner surface radially spaced from and extending parallel to and about said pivot axis.
12 . A pedal assembly as set forth in claim 11 wherein said first and second magnets are disposed on said inner surface of said rotor.
13 . A pedal assembly as set forth in claim 12 wherein said rotor is formed from a material that is magnetizeable for facilitating magnetic lines of flux to extend from and between said magnets and through said rotor.
14 . A pedal assembly as set forth in claim 13 wherein said magnetic flux sensor is supported by said fixed element.
15 . A pedal assembly as set forth in claim 14 wherein said first and second magnetic poles are supported by said rotatable element.
16 . A pedal assembly as set forth in claim 1 wherein said pivot is disposed between said bracket and said pedal arm.
17 . A pedal assembly as set forth in claim 1 wherein said pedal assembly further comprises a guide member rotatably supported by said bracket.
18 . A pedal assembly as set forth in claim 17 wherein said pivot is disposed between said guide member and said bracket.
19 . A pedal assembly as set forth in claim 18 wherein said pedal arm is supported by said guide member for movement between fore and aft directions relative to said bracket.
20 . A pedal assembly as set forth in claim 1 wherein said pedal assembly further comprises a guide member.
21 . A pedal assembly as set forth in claim 20 wherein said pedal assembly further comprises a carrier supported by said guide member for movement in fore and aft directions relative to said bracket.
22 . A pedal assembly as set forth in claim 21 wherein said pedal arm is supported by said carrier.
23 . A pedal assembly as set forth in claim 22 wherein said pivot is disposed between said pedal arm and said carrier.
24 . A non-contact position sensor disposed on a pivot axis, said sensor comprising:
a pivot including a fixed element and a rotatable element rotatable relative to said fixed element about said pivot axis;
a magnetic flux sensor supported by one of said elements on said pivot axis;
first and second magnetic poles supported by the other of said elements and presenting opposing surfaces of opposite magnetic polarity;
said flux sensor disposed between said first and second magnetic poles;
said position sensor characterized by said first and second magnetic poles disposed in spaced and parallel relationship to one another for creating substantially uniform flux density over a predetermined distance parallel to said surfaces of said magnetic poles.
25 . A pedal assembly as set forth in claim 24 wherein said opposing surfaces are straight and create substantially parallel lines of magnetic flux between said surfaces on either side of said pivot axis.
26 . A pedal assembly as set forth in claim 25 wherein said substantially uniform flux density is further defined as a difference in flux density of no more than 1500 Gauss throughout said predetermined distance.
27 . A pedal assembly as set forth in claim 26 wherein said substantially uniform flux density is further defined as a flux density in the range of from 2000 to 3500 Gauss throughout said predetermined distance.
28 . A non-contact position sensor as set forth in claim 26 wherein said flux sensor has a face that presents a straight longitudinal axis.
29 . A non-contact position sensor as set forth in claim 28 wherein said face is perpendicular to said opposing surfaces.
30 . A non-contact position sensor as set forth in claim 29 wherein each of said opposing surfaces extends a length at least equal to a space between said opposing surfaces.
31 . A non-contact position sensor as set forth in claim 30 wherein said flux sensor is on said pivot axis and said predetermined distance is on either side of said pivot axis.
32 . A pedal assembly as set forth in claim 1 wherein said predetermined distance is further defined as a distance at least equal to a length of said flux sensor.
33 . A non-contact position sensor as set forth in claim 32 wherein said first and second magnetic poles are further defined as first and second magnets.
34 . A non-contact position sensor as set forth in claim 33 wherein said other of said elements comprises a rotor coaxial with said pivot axis and having an inner surface radially spaced from and extending parallel to and about said pivot axis.
35 . A non-contact position sensor as set forth in claim 34 wherein said first and second magnets are disposed on said inner surface of said rotor.
36 . A non-contact position sensor as set forth in claim 35 wherein said rotor is formed from a material that is magnetizeable for facilitating magnetic lines of flux to extend from and between said magnets and through said rotor.
37 . A non-contact position sensor as set forth in claim 36 wherein said magnetic flux sensor is supported by said fixed element.
38 . A non-contact position sensor as set forth in claim 37 wherein said first and second magnetic poles are supported by said rotatable element.