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Angular position measuring device

A technology for measuring equipment and angular position, which is applied in the field of magnetic sensors and can solve the problems of unusable equipment and sensor correlation.

Inactive Publication Date: 2014-05-07
CONTINENTAL AUTOMOTIVE FRANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this does not solve the problems associated with the sensor itself
[0024] In practice, the result is that figure 2 The prior art angular position measuring devices described in are usually only used in a reduced angular range, typically between 0 and 179.8°, which renders them unusable for the need to determine Certain cases of angular positions in the range between and above 180°

Method used

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Embodiment Construction

[0041] Therefore, the present invention relies on Figure 3a The principle shown in is as follows: intentionally create a double offset in the assembly of an angular position measuring device 20 using a sensor 10 based on the reluctance bridge already described; and control the offset while are not subject to the offset. Therefore, the double offset is decomposed into:

[0042] - on the one hand, the first offset Exc_R between the magnetic sensor 10 and the axis 14 of the moving magnetic element 12 (which in this exemplary embodiment is annular); and

[0043] On the other hand, the second offset Exc_A between the moving magnetic element 12 and its axis of rotation 30 .

[0044] More specifically, refer to Figure 3b , the offset value used to define each offset type in the above two offset types is decomposed into: offset distance, which is Distance_R (distance_R) for the first offset Exc_R and second offset Exc_A respectively R) and Distance_A (distance_A); and an offset ...

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Abstract

The invention relates to an angular position measuring device (20) including a magnetic sensor (10) cooperating with a moving magnetic element (12), the sensor including at least one first (R1-R4) and one second (R5-R8) group of magnetoresistive elements each configured as a Wheatstone bridge, suitable for supplying a first and a second measurement signal (Sin, Cos) respectively proportional to the sine and the cosine of twice the angular position (alpha) of the moving magnetic element, and a processing unit supplying a response corresponding to the angular position from the first and second measurement signals, characterized in that the sensor is deliberately offset relative to an axis (14) of the moving magnetic element and in that the latter is deliberately offset relative to its rotation axis (30), by offset values that are deliberately selected so that the angular measurement range extends beyond 180°.

Description

technical field [0001] The invention relates to the field of measuring angular positions of moving elements using magnetic sensors, in particular sensors based on techniques for measuring magnetic fields using magnetoresistive elements. [0002] More specifically, the present invention relates to an angular position measuring device comprising a magnetic sensor cooperating with a moving magnetic element whose rotation angle is to be measured, said magnetic sensor comprising at least one first reluctance element sets and a second set of magneto-resistive elements, each set of magneto-resistive elements configured as a Wheatstone bridge adapted to provide first and second measurement signals, which are respectively connected to the a sine and a cosine proportional to twice the angular position of the moving magnetic element; and a processing unit that provides a response corresponding to the angular position of the moving magnetic element based on the first and second measuremen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/14
CPCG01D5/145G01D2205/73
Inventor Y·蒙特尔E·瑟维尔
Owner CONTINENTAL AUTOMOTIVE FRANCE