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Angle measurement system

A technology of angle measurement and absolute angle, which is applied in the direction of measuring devices, conversion sensor output, instruments, etc., and can solve problems such as hindering configuration and low efficiency

Inactive Publication Date: 2014-05-07
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the inventors have realized, in many applications it is inefficient to mount the GMR sensor at the end of the shaft on the axis of rotation of the shaft due to space constraints.
For example, in a vehicle, the end of the steering shaft typically has a knuckle assembly attached to it, and there is no practical way to mount a GMR sensor on the axis of rotation of the steering shaft because the knuckle assembly blocks this configuration

Method used

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Embodiment Construction

[0021] The claimed subject matter is now described with reference to the drawings, wherein like numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of claimed subject matter. It may be evident, however, that claimed subject matter may be practiced without these specific details.

[0022] Aspects of the disclosure relate to techniques for measuring the angular position of a rotational axis. As will be described in more detail below, some angle measurement systems of the present disclosure include at least two magnets that cooperate to rotate at different rates according to a predetermined relationship (eg, a predetermined gear ratio). One or more often fixed angular sensors measure the directionality of the resultant magnetic field at different positions for a particular angular axis position. Based on the directionality of the ma...

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Abstract

Some aspects of the present disclosure relate to techniques for measuring an angular position of a rotating shaft. As will be described in greater detail below, some angle measurement systems of the present disclosure include at least two magnets that cooperatively rotate at different rates according to a predetermined relationship (e.g., a predetermined gear ratio). Two or more magnetic field sensing elements, which are often stationary, measure the directionality of the resultant magnetic field at different positions for a particular angular shaft position. Based on the directionality measured by the magnetic field sensing elements, the techniques can determine an absolute angular position of the rotating shaft, which can be greater than three-hundred and sixty degrees.

Description

technical field [0001] The present invention relates to angle measurement. Background technique [0002] Magnetic sensing devices such as giant magnetoresistance (GMR) sensors can be used in a variety of applications. For example, GMR sensors are often used to sense the angular position of a rotating shaft. In this application, a permanent magnet (sometimes called a "pill") may be mounted at the end of the steering shaft and centered on the shaft's axis of rotation. The GMR elements or resistors, typically connected to form one or more bridges, may also be positioned so as to be centered on the axis of rotation along with the resulting output signal generated by the GMR resistors indicative of the angular position of the axis of rotation. However, as the inventors have appreciated, in many applications it is inefficient to mount the GMR sensor at the end of the shaft on the axis of rotation of the shaft due to space constraints. For example, in a vehicle, the end of the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/30
CPCG01B7/30G01D5/145G01D2205/26G01D2205/28
Inventor J·W·斯特林
Owner INFINEON TECH AG