WO2003071229B1 - Rapid high resolution position sensor for auto steering - Google Patents

Rapid high resolution position sensor for auto steering

Info

Publication number
WO2003071229B1
WO2003071229B1 PCT/US2003/004059 US0304059W WO03071229B1 WO 2003071229 B1 WO2003071229 B1 WO 2003071229B1 US 0304059 W US0304059 W US 0304059W WO 03071229 B1 WO03071229 B1 WO 03071229B1
Authority
WO
WIPO (PCT)
Prior art keywords
rotational position
position sensor
original
code disk
sensing
Prior art date
Application number
PCT/US2003/004059
Other languages
French (fr)
Other versions
WO2003071229A2 (en
WO2003071229A3 (en
Inventor
Richard Alsobrooks
Jr Richard Graham
Thomas Wand
Roland Ruegenberg
Vladimir Karasik
Michael Strahan
Original Assignee
Methode Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Methode Electronics Inc filed Critical Methode Electronics Inc
Priority to KR10-2004-7012632A priority Critical patent/KR20050002825A/en
Priority to EP03742721A priority patent/EP1476722A4/en
Priority to JP2003570088A priority patent/JP2005517944A/en
Publication of WO2003071229A2 publication Critical patent/WO2003071229A2/en
Publication of WO2003071229A3 publication Critical patent/WO2003071229A3/en
Publication of WO2003071229B1 publication Critical patent/WO2003071229B1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/02—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using mechanical means
    • G01D5/04—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using mechanical means using levers; using cams; using gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D15/00—Steering not otherwise provided for
    • B62D15/02—Steering position indicators ; Steering position determination; Steering aids
    • B62D15/021—Determination of steering angle
    • B62D15/0215—Determination of steering angle by measuring on the steering column
    • B62D15/022—Determination of steering angle by measuring on the steering column on or near the connection between the steering wheel and steering column
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
    • G01D2205/20—Detecting rotary movement
    • G01D2205/26—Details of encoders or position sensors specially adapted to detect rotation beyond a full turn of 360°, e.g. multi-rotation

Abstract

A position sensor (100) for determining the angular position of a steering wheel. The shaft of the steering wheel is connected to a code disk and turn ring of the sensor so that when the steering wheel is rotated, the coded disk and turn ring are also rotated. The code disk is a flat circular disk having a series of cut-outs and is read by a photo detector which determines the angular position of the code disk. The turn ring is fitted on the outside of the code disk and rotates in a hypocycloidic circle so that for every full revolution of the code disk, the turn ring rotates through a smaller angle. The turn ring is placed over a series of Hall sensors to determine the number of revolutions of the code disk.

Claims

AMENDED CLAIMS[received by the International Bureau on 10 November 2003 (10.11.03) ; claims 7 and 15 are amended and claims 34 and 35 are added ; remaining claims unchanged. (7 pages)]
1. (Original) A rotational position sensor for sensing a rotational position of a rotating object, the rotational position comprising: a hub; a code disk attached to the hub; a housing for holding the hub and the code disk; wherein said code disk includes markings arranged around its circumference, the markings forming a unique pattern over a predetermined portion of the circumference, said unique pattern identifying a unique rotational position.
2. (Original) The rotational position sensor' for sensing a rotational position of a rotating object of claim 1, the rotational position further comprising: a PC board having a photodetector; and a light source that shines a light past the markings onto the pliotodetector, the pliotodetector reading the light and dark images to identify the rotational position of the code disk.
3. (Original) The rotational position sensor for sensing a rotational position of a rotating object of claim 2, wherein: the code disk is made of a metal material and the markings around its circumference are formed of cut-outs.
4. (Original) The rotational position sensor for sensing a rotational position of a rotating object of claim 2, wherein: the PC board is a flexible ribbon cable hav g a main panel and sensor panel, a microprocessor being located on the main panel and the photo detector being located on the sensor panel.
22
5. (Original) The rotational position sensor for sensing a rotational position of a rotating object of claim 2, wherein: the markings comprise equally sized bits that form the unique pattern; and the photodetector reads more than the number of bits necessary to identify the unique rotation position so that it is able to read several rotational positions simultaneously.
6. (Original) The rotational position sensor ;for sensing a rotational position of a rotating object of claim 2, wherein: the photodetector is a charge coupling device.
7. (Amended) The rotational position sensor for sensing a rotational position of a rotating object of claim 2, wherein: the photodetector reads the code disk at timed intervals, and the light source is timed to flash simultaneously with the reading of the photodetector.
8. (Original) The rotational position sensor for sensing a rotational position of a rotating object of claim 2, wherein: the PC board includes a plurality of sensors for detemiining the number of revolutions of the pode disk.
9. (Original) The rotational position sensor for sensing a rotational position of a rotating object of claim 8, wherein: the plurality of sensors are Hall sensors.
10. (Original) The rotational position sensor for sensing a rotational position of a rotating object of claim 9, wherein: each revolution of the code disk has more than one signal combination provided by the Hall sensors to provide a more accurate count of the code disk revolution.
11. (Original) The rotational position sensor for sensing a rotational position of a rotating object of claim 2, wherein: the markings comprise equally sized bits that form the unique pattern; and each bit comprises a plurality of pixels, the plurality of pixels being more than the number of pixels necessary to define each bit so that the photo detector is able to oversample each bit to more reliably identify it.
12. (Original) The rotational position sensor for sensing a rotational position of a rotating object of claim 1, the rotational position further comprising: a turn ring; and a plurality of sensors; wherein the turn ring cooperates with a plurality of sensors for determining the number of revolutions of the code disk.
13. (Original) The rotational position sensor for sensing a rotational position of a rotating object of claim 12, wherein: the turn ring has gear teeth that mesh with gear teeth on the housing of the position sensor.
14. (Original) The rotational position sensor for sensing a rotational position of a rotating object of claim 12, wherein: the turn ring has a magnet on its circumference that travels over the plurality of sensors, energizing specific sensors depending on the number of revolutions of the code disk.
15. (Amended) A rotational position sensor comprising; a housing containing a hub including a generally circular shaped disk having a first ledge and a second ledge, a code disk including a generally circular shaped disk rigidly fixed to the first ledge of the hub, and a turn ring on the code disk having gear teeth that engage gear teeth on the housing.
24
16. (Original) The rotational position sensor of claim 15, further comprising; a PC board including a photodetector that reads the rotational position of the code disk and a plurality of sensors that determine whether the code disk undergoes any revolutions.
17. (Original) The rotational position sensor of claim 16, wherein; the code disk contains markings arranged around its circumference forming a unique pattern over a pre eterniined portion of the circumference, said unique pattern identifying a specific rotational position, and the photodetector reading the markings to identify the unique rotational position of the code disk.
18. (Original) The rotational position sensor of claim 17, further comprising; a light source that shines a light through the markings in the code disk onto the photodetector.
19. (Original) The rotational position sensor of claim 18, wherein; the markings are formed of cut-outs in the code disk.
20. (Original) The rotational position sensor of claim 17, wherein; the markings comprise equally sized bits that form the unique pattern, each bit comprising a plurahty bf pixels, the plurality of pixels being more than the number of pixels necessary to define each bit so that the photo detector is able to oversample each bit to more reliably identify it.
21. (Original) The rotational position sensor of claim 16, wherein; the turn ring has a magnet on its circumference that travels over the plurality of sensors, energizing specific sensors depending on the number of revolutions of the code disk.
22. (Original) The rotational position sensor of claim 21 , wherein; the second ledge drives the rotation of the turn ring in a hypocycloidic path around the gear teeth in the housing.
25
23. (Original) The rotational position sensor of claim 22, wherein; the housing includes a cover and a base; and the gear teeth in the housing are on the cover.
24. (Original) The rotational position sensor of claim 22, wherein; the housing includes a cover and a base; and the gear teeth in the housing are on the base.
25. (Original) A position sensor for sensing the rotational position of a steering wheel comprising; a housing, a hub, a code disk, a turn ring and a PC board; wherein the housing holds said hub, code disk, turn ring and PC board therein; wherein the code disk is fixed to the hub and includes markings arranged around its circumference, the markings forming a unique pattern over a predetermined portion of the circumference, said unique pattern identifying a specific rotational position.
26. (Original) The position sensor for sensing the rotational position of steering wheel of claim 25, wherein; the nun ring is placed on the bub, the turn ring having gear teeth on its inner diameter that mesh with gear teeth on the housing of the position sensor.
27. (Original) The position sensor for detemiining the rotational position of steering wheel of claim 26, wherein; the PC board includes a photodetector and a plurality of sensors, the markings comprising equally sized bits that form the unique pattern the photodetector reading the bit sequence of the code disk to determine the rotational position of the code disk, and the plurahty of sensors responding to a magnet on the turn ring to determine whether the code disk rotates more than 360 degrees.
26
28. (Original) The position sensor for sensing the rotational position of steering wheel of claim 27, wherein; the PC board is made of a flexible ribbon cable that can be configured into different shapes.
29. (Original) The position sensor for determining the rotational position of steering wheel of claim 27, further including; a light emitting diode (LED) attached to the PC board, the LED shining a light through the markings of the code disk onto the photodetector.
30. (Original) The position sensor for detennming the rotational position of steering wheel of claim 29, wherein; the photodetector continuously reads the code disk at timed intervals, and the LED is timed to flash simultaneously with the reading of the photodetector.
31. (Original) The position sensor for determining the rotational position of steering wheel of claim 27, wherein; the photodetector reads more than a predetermined number of bits so that it is able to read several continuous rotational positions simultaneously, ensuring the accuracy of the readings by confirming they form a series.
32. (Original) The position sensor for determining the rotational position of steering wheel of claim 25, wherein; the markings are formed of cut-outs.
33. (Original) The position sensor for determining the rotational position of steering wheel of claim 32, wherein; the markings comprise equally sized bits that form the unique pattern; and each bit comprises a plurahty of pixels, the plurality of pixels being more than the number of pixels necessary to define each bit so that the photo detector is able to oversample each bit to more reliably identify it.
27
34. (New) A rotational position sensor comprising: a housing holding a hub, a code disk and a turn ring, wherein the code disk is rigidly fixed to the hub so as to have the same rotational axis thereof and including markings thereon to identify its rotational position; wherein the turn ring is placed around the hub and is rotatable relative thereto, the turn ring having a rotational axis different from that of the hub, and wherein the turn ring indicates whether the code disk has undergone a full revolution; and wherein the rate of rotation of the turn rmg and the hub are different.
35. (New) The rotational position sensor of claim 34 wherein the turn ring has gear teeth that mesh with gear teeth on the housing, such that when the hub rotates relative to the housing, the rate of rotation of the turn ring being slower than the hub.
28
PCT/US2003/004059 2002-02-15 2003-02-12 Rapid high resolution position sensor for auto steering WO2003071229A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR10-2004-7012632A KR20050002825A (en) 2002-02-15 2003-02-12 Rapid high resolution position sensor for auto steering
EP03742721A EP1476722A4 (en) 2002-02-15 2003-02-12 Rapid high resolution position sensor for auto steering
JP2003570088A JP2005517944A (en) 2002-02-15 2003-02-12 A fast and high-resolution position detector for automotive steering systems.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/075,562 2002-02-15
US10/075,562 US6844541B2 (en) 2002-02-15 2002-02-15 Rapid high resolution position sensor for auto steering

Publications (3)

Publication Number Publication Date
WO2003071229A2 WO2003071229A2 (en) 2003-08-28
WO2003071229A3 WO2003071229A3 (en) 2003-11-06
WO2003071229B1 true WO2003071229B1 (en) 2003-12-31

Family

ID=27752673

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/004059 WO2003071229A2 (en) 2002-02-15 2003-02-12 Rapid high resolution position sensor for auto steering

Country Status (5)

Country Link
US (2) US6844541B2 (en)
EP (1) EP1476722A4 (en)
JP (1) JP2005517944A (en)
KR (1) KR20050002825A (en)
WO (1) WO2003071229A2 (en)

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Also Published As

Publication number Publication date
WO2003071229A2 (en) 2003-08-28
US6956198B2 (en) 2005-10-18
US20040173734A1 (en) 2004-09-09
EP1476722A2 (en) 2004-11-17
EP1476722A4 (en) 2007-04-25
WO2003071229A3 (en) 2003-11-06
JP2005517944A (en) 2005-06-16
US6844541B2 (en) 2005-01-18
KR20050002825A (en) 2005-01-10
US20040206895A1 (en) 2004-10-21

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