Measuring vibration in a rotating element

• US 8,664,948 B2
• Filed: 04/08/2010
• Issued: 03/04/2014
• Est. Priority Date: 04/08/2009
• Status: Expired due to Fees

• Current Assignee: Commissariat a L'Energie Atomique (French Alternative Energies and Atomic Energy Commission)
• Original Assignee: Commissariat a L'Energie Atomique (French Alternative Energies and Atomic Energy Commission)
• Inventors: Le Goff, Alexis, Blanpain, Roland
• Primary Examiner(s): LEDYNH, BOT L
• Application Number:
  US13/263,267
• Publication Number:
  US 20120098528A1
• Time in Patent Office: 1,426 Days
• Field of Search: 324/207.25
• US Class Current: 324/207.25
• CPC Class Codes: B60C 23/06 Signalling devices actuated by deformation of the tyre , e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle
• CPC Class Codes: B60C 23/068 by monitoring chassis to tyre distance
• CPC Class Codes: B60G 17/019 characterised by the type of sensor or the arrangement thereof B60G17/01941 takes precedence
• CPC Class Codes: B60G 2400/0514 Wheel angle detection
• CPC Class Codes: B60G 2400/0516 Angular position of a suspension element
• CPC Class Codes: B60G 2400/208 of wheel rotation
• CPC Class Codes: B60G 2401/17 Magnetic/Electromagnetic
• CPC Class Codes: G01B 7/14 for measuring distance or clearance between spaced objects or spaced apertures G01B7/30 takes precedence

Abstract

A system for measuring a variation in a distance of an axis of rotation of an object relative to a point in a plane perpendicular to this axis comprises at least two sensors for measuring a value representing an angular position of said object about said axis, at least a first of said sensors, whose position is fixed relative to said point, comprising a magnetometer suitable for measuring the magnetic field generated by said object whose magnetization varies around its circumference; and means for determining said variation of distance on the basis of a variation in an angular deviation between said sensors relative to the axis, from one revolution of said object to the next.

Claims

1. A system for measuring a variation of the distance of a rotation axis of an object with respect to a point in a plane perpendicular to this axis, comprising:

at least two sensors capable of measuring information representative of an angular position of said object around said axis, each sensor having a fixed position with respect to said point and comprising a magnetometer capable of measuring the magnetic field emitted by said object which has a variable magnetization over its circumference; and

means for determining said variation of the distance based on a variation of the angular distance between said sensors with respect to the axis, from one revolution to another of said object, said means exploiting a time shift between extrema in the responses of the two sensors.

2. The system of claim 1, wherein said means detect, in a response signal of said sensors, at least one extremum in the magnetic signature for each revolution of said object.

3. The system of claim 1, wherein the two sensors are not aligned with said point.

4. The system of claim 2, wherein said means estimate the time interval between the occurrence of said extremum in the respective responses of said sensors, and deduce said angular distance variation therefrom.

5. The system of claim 1, applied to a measurement of the vertical lift of a motor vehicle wheel.

6. A system for measuring a variation of the distance between a rotation axis of an object with respect to a point in a plane perpendicular to this axis, comprising the steps of:

measuring first information representative of an angular position of said object around said axis by means of a first sensor, of fixed position with respect to said point, comprising a magnetometer capable of measuring the magnetic field emitted by said object which has a variable magnetization over its circumference;

measuring second information representative of an angular position of said object around said axis by means of a second sensor having a fixed position with respect to said point and comprising a magnetometer capable of measuring the magnetic field emitted by said object;

estimating a variation of the angular distance between said sensors with respect to the axis, from one revolution to another of said object by exploiting a time shift between extrema in the responses of the two sensors; and

deducing therefrom a variation of said distance.