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Rotation angle detection device and rotation angle correction method

A rotation angle detection and rotation angle technology, applied in the direction of measuring device, electric device, electric steering mechanism, etc., can solve problems such as difficulty, lower rotation angle detection accuracy, unsuitable for absolute rotation angle detection, etc., and achieve high resolution. The effect of improving the accuracy of rotation angle detection

Inactive Publication Date: 2009-10-21
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, since the rotation of the encoder plate and the rotation of the shaft are realized through gears, it is a little difficult to improve the detection accuracy through backlash, etc.
Moreover, since the rotation angle detection device can only be used when detecting relative rotation angles, it is not suitable for detection of absolute rotation angles.
[0006] Furthermore, in the above-mentioned rotation angle detection device, there is a problem that the detection accuracy of the rotation angle of the detected shaft is lowered due to the alignment accuracy or eccentricity of the gears, the detection error of the rotation angle detection unit, and the like.

Method used

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  • Rotation angle detection device and rotation angle correction method
  • Rotation angle detection device and rotation angle correction method
  • Rotation angle detection device and rotation angle correction method

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Experimental program
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Effect test

Embodiment approach 1

[0128] Below, use Figure 1 to Figure 7 Embodiment 1 of the present invention will be described.

[0129] figure 1 It is a basic configuration diagram showing the absolute rotation angle detection device according to Embodiment 1 of the present invention, and FIG. 2 is a diagram showing a rotation angle detection signal of the first magnetic detection element, image 3 is a diagram showing the rotation angle detection signal of the second magnetic detection element, Figure 4 It is a circuit block diagram of the absolute rotation angle detection device. Figure 5 It is a graph showing ideal values ​​and actual values ​​of the absolute rotation angles of the first and second rotating bodies, Figure 6 It is a diagram showing the rotation angle calculation output signal in the CPU and the absolute rotation angle, Figure 7 It shows the output signal diagram of the 1st and 2nd magnetic detection element.

[0130] exist figure 1 Among them, the first rotating body 101 is a...

Embodiment approach 2

[0149] use Figure 8A to Figure 14 Embodiment 2 will be described. Figure 8A , Figure 8B and Figure 8C is a basic configuration diagram of a rotation angle detection device according to Embodiment 2, Figure 9 is the circuit block diagram of the rotation angle detection device, Figure 10A , Figure 10B is a diagram showing the output signal of the first detection unit, Figure 11A , Figure 11B is a diagram showing the output signal of the third detection unit, Figure 12A , Figure 12B It is a figure which shows the output signal of the 4th detection part, and FIG. 13 is a figure which shows the rotation angle of the 3rd and 4th rotators used when detecting the rotation angle of the 1st rotator and the rotation angle of the 2nd rotator, Figure 14 This is an explanatory diagram for explaining how to prevent rotation angle detection errors from occurring.

[0150] exist Figure 8A ~ Figure 8B Among them, the input shaft 204 is fitted with the first rotating body ...

Embodiment approach 3

[0184] Next, use Figure 15 to Figure 23 Embodiment 3 of the present invention will be described. In particular, Embodiment 3 relates to a high-precision rotation angle detection device for correcting a mechanical error of a gear or an electronic error of a rotation angle detection unit, and a method for correcting the rotation angle.

[0185] Figure 15 is a configuration diagram of a rotation angle detection device according to Embodiment 3 of the present invention. A multi-pole magnetic ring 302 serving as a target is connected to the detected shaft 301 , and a first rotation angle detection unit 303 is arranged at a position facing the multi-pole magnetic ring 302 . A worm wheel 304 is connected to the detected shaft 301 , and a gear 305 meshes with the worm wheel 304 . A magnet 306 is arranged at the center of the gear 305 , and a second rotation angle detection unit 307 for detecting a rotation angle is arranged at a position facing the magnet 306 . The motor 309 is ...

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Abstract

The present invention provides a device for detecting an absolute rotation angle of a multi-turn rotation with high precision and high resolution using a target connected to a rotating shaft and magnetized with magnetic poles whose outer peripheral surface alternates in polarity. This device has: the first rotating body (101), which is connected with the input shaft, and holds the target (103) and has a gear that can rotate multiple turns, and the target (103) has magnetized Magnetic poles with alternating polarities; the second rotating body (108), which is connected to the gear of the first rotating body (101), rotates at a lower speed than the first rotating body (101), and has a magnet in the center (109); and a first detecting unit (110) and a second detecting unit (111), which detect the rotation angles of the first rotating body (101) and the second rotating body (102). The present invention can detect the absolute rotation angle with high precision and high resolution with a simple structure.

Description

technical field [0001] The present invention relates to a rotation angle detection device used in a vehicle body control system, etc., and more particularly to a rotation angle detection device for detecting an absolute rotation angle of a multi-rotatable steering wheel and a method for correcting the rotation angle. Background technique [0002] Figure 26 Indicates a conventional rotation angle detection device. The gear unit 38 is attached to a rotation shaft (not shown) whose rotation angle is to be detected by engaging a spring 39 . The gear part 38 meshes with a gear part 41 on which an encoder plate 40 magnetized with a plurality of magnetic poles is mounted on the outer peripheral end surface, and the magnetic poles provided on the encoder plate 40 move with the rotation of the rotating shaft to be detected. The number of the magnetic poles is counted by the detection element 42 provided facing the outer peripheral end surface, thereby detecting the rotation angle. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/30B62D5/04
Inventor 植平清孝御池幸司一宫礼孝笹之内清孝三户宏一
Owner PANASONIC CORP