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Position sensing apparatus

A sensing device and sensing technology, applied in measuring devices, using electrical devices, converting sensor output, etc., can solve problems such as difficult design and manufacture

Active Publication Date: 2015-07-01
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Also, it is difficult to design and manufacture yokes with gradually varying widths

Method used

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  • Position sensing apparatus
  • Position sensing apparatus
  • Position sensing apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0028] The position sensing device according to the first embodiment of the present invention is installed in such as figure 1 shown in the rotary drive unit. Rotary drive 80 is used to open and close a wastegate valve (not shown). In a supercharged internal combustion engine provided with a turbocharger, the wastegate valve adjusts the flow of engine exhaust gas supplied to the turbine of the turbocharger by opening and closing a bypass passage bypassing the turbine.

[0029] First, refer to figure 1 The structure of the rotary driving device 80 is described. The rotary driving device 80 includes a housing 81 , a casing 82 , a motor (hereinafter simply referred to as a motor) 85 , a rotatable body 87 , an output shaft 92 and a position sensing device 5 .

[0030] The case 81 has a motor receiving chamber and is fixed to a body of a vehicle (for example, an automobile) or to an element mounted to a body of the vehicle.

[0031] The housing 82 includes a cover portion 83 an...

no. 2 example

[0071] will refer to Figure 6 and Figure 7 A position sensing device according to a second embodiment of the present invention is described.

[0072] Such as Figure 6 and Figure 7 As shown, the first yoke 41 of the position sensing device 40 includes an intermediate portion 42 between one end portion 11 and the other end portion 13 of the first yoke 41 . When the first yoke 41 and the second yoke 15 are viewed in opposite directions, the width b3 of the intermediate portion (first intermediate portion) 42 of the first yoke 41 and the width b3 of the intermediate portion (second intermediate portion) 36 of the second yoke 15 b1 are different from each other.

[0073] Specifically, as Figure 7 As shown, the width b3 of the middle portion 42 of the first yoke 41 is greater than the width b1 of the middle portion 36 of the second yoke 15 and smaller than the width b2 of the end portions 11 , 12 of the first yoke 41 . The width b1 and the width b3 are set so that the mag...

no. 3 example

[0076] will refer to Figure 8 and Figure 9 A position sensing device according to a third embodiment of the present invention will be described.

[0077] Such as Figure 8 and Figure 9 As shown, the second yoke 46 of the position sensing device 45 includes an intermediate portion 47 between one end portion 16 and the other end portion 17 of the second yoke 46 . When the first yoke 10 and the second yoke 16 are viewed in opposite directions, the width b1 of the intermediate portion (first intermediate portion) 36 of the first yoke 10 is different from the width b1 of the intermediate portion (second intermediate portion) 47 of the second yoke 46 b4 are different from each other.

[0078] Specifically, as Figure 9 As shown, the width b4 of the middle portion 47 of the second yoke 46 is greater than the width b1 of the middle portion 35 of the first yoke 10 and smaller than the width b2 of the end portions 16 , 17 of the second yoke 46 .

[0079] According to the third ...

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Abstract

Each of a first yoke and a second yoke has an intermediate portion between one end portion and the other end portion of the yoke. When the first and second yokes are viewed in an opposing direction, a width of the intermediate portion of each yoke, which is measured in a direction perpendicular to a rotational direction, is smaller than a width of the one end portion and a width of the other end portion of the yoke and is constant along an entire extent of the intermediate portion in the rotational direction.

Description

technical field [0001] The invention relates to a position sensing device which senses the position of a sensing object. Background technique [0002] Known magnetic position sensing devices sense the position of a sensing object that moves relative to a reference element. This type of position sensing device includes two magnets, two yokes (flux conducting elements), and a magnetic flux density sensing device (magnetic flux density sensing device). The magnet and yoke form a closed magnetic circuit. The magnetic flux density sensing device is, for example, a Hall element installed inside a closed magnetic circuit. For example, the magnet and yoke are mounted to the sensing object and the magnetic flux density sensing device is mounted to the reference element. The density of the magnetic flux passing through the magnetic flux density sensing device varies in response to the position of the magnetic flux density sensing device relative to the yoke. The position sensing d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/00
CPCG01D5/145
Inventor 河野尚明山中哲尔
Owner DENSO CORP