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Rotation angle detection apparatus

By utilizing the gear linkage of the main rotating body and the auxiliary rotating body and the independent output signal of the magnetic sensor in the rotation angle detection device, the angle measurement error problem caused by complex calculations and sensitivity differences in the existing technology is solved, and accurate and simplified rotation is achieved. Angle detection.

Inactive Publication Date: 2007-10-17
PANASONIC HOLDINGS CORP
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Problems solved by technology

[0014] However, in the above-mentioned conventional rotation angle detection device 60, there is a problem that the detection of the rotation angle by the control circuit requires complicated arithmetic processing.
Furthermore, if there is a difference in sensitivity between the magnetic sensor S1 and the magnetic sensor S2, the peak values ​​of S1 and S2 shown in FIG. 6 will be different, which will cause an error in the measured angle.
Therefore, there is a problem that the sensitivities of the two magnetic sensors S1 and S2 must always be exactly the same

Method used

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Embodiment approach

[0025] 1 and 2 are diagrams illustrating a rotation angle detection device according to an embodiment of the present invention. The rotation angle detection device 10 has a main rotating body 11 having a gear 11A formed on the outer periphery thereof. A steering device (not shown) is inserted through an opening at the center of the main rotating body 11 , and the main rotating body 11 is engaged with the steering device.

[0026] The rotation angle detection device 10 further includes a first sub-rotation body 12 formed with a gear 12A, and a second sub-rotation body 13 formed with a gear 13A. Here, it is assumed that the number of teeth of the gear 12A is slightly different from the number of teeth of the gear 13A. The slight difference here means that the difference in the number of teeth is 1-3. In addition, the gears 12A and 13A mesh with the upper and lower positions of the same position of the gear 11A of the main rotating body 11 . That is, the first sub-rotation bod...

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Abstract

The present invention provides a rotation angle detection apparatus including a main rotatable body, a pair of sub rotatable bodies, and a control circuit. The sub rotatable bodies are rotated in a linked motion with the rotation of the main rotatable body and are overlapped with each other. The control circuit detects a rotation angle from a rotation of one of the sub rotatable bodies, and detects a rotation phase difference between the rotation of one sub rotatable body and the rotation of the other sub rotatable body of the pair of the sub rotatable bodies. From the two detected signals, the control circuit calculates a rotation angle of the main rotatable body.

Description

technical field [0001] The present invention relates to a rotation angle detecting device used for detecting a rotation angle of a vehicle steering device or the like. Background technique [0002] In recent years, a rotation angle detection device that detects a rotation angle of a steering device that rotates in conjunction with rotation of a steering wheel has been widely used. Rotation angle detection devices are used in the improvement of vehicle driving stability, automatic driving, and warehousing assistance when parking, etc. [0003] In such devices, detection of a rotation angle of a steering wheel that is rotated by a driver's operation of the steering wheel is very important. In particular, a device capable of detecting an absolute angle with accurate detection angle accuracy is required. [0004] Such a conventional rotation angle detection device will be described with reference to FIGS. 5 to 6 . [0005] FIG. 5 is a plan view of a conventional rotation angl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/30B62D1/00
CPCG01D5/145
Owner PANASONIC HOLDINGS CORP
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