JP2002340618A - Turning angle detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the turning angle of rotary bodies by simple calculation processing without causing a large error in a turning angle detecting device for a multiply rotatable steering wheel used for a car body control system of automobile. SOLUTION: A magnet 5 is incorporated into the second rotary body 3 connected so as to rotate at a speed lower than that of the first rotary body 1, and a first detecting means 14 is arranged just under the magnet 5. A magnet is incorporated into the third rotary body 6 connected so as to rotate at a speed faster than the first rotary body 1, and a second detecting means 15 is arranged just under the magnet. When the first rotary body 1 rotates, the second rotary body 3 and the third rotary body 6 rotate, and the magnets incorporated into the respective rotary bodies rotate. The direction of magnetic force penetrating through the detecting means 14 and 15 changes, and output changes. The output is calculated by an arithmetic circuit part 16, and a turning angle of the multiply rotatable first rotary body 1 is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting the rotation angle of a multi-turn handle used in a vehicle body control system of an automobile.

[0002]

2. Description of the Related Art Conventionally, as in the case of a steering wheel for an automobile, such as a steering wheel for a car,
2. Description of the Related Art As a rotation angle detection device that detects the rotation angle of a rotator that rotates more than finitely, one disclosed in Japanese Patent Application Laid-Open No. 11-500828 is known. In this device, the rotation angle is detected from the angle between two rotating bodies having a phase difference.

[0003]

However, in the above-described device, when the angles of the two gears are shifted from each other due to rattling of the gears, a large measurement error may occur particularly at the start of operation of the device. In addition, calculating the rotation angle required complicated calculation processing.

An object of the present invention is to solve this problem, and to provide a rotation angle detecting device capable of detecting the rotation angle of a rotating body which makes multiple rotations without generating a large error and with a simple calculation process. It is intended for.

[0005]

According to a first aspect of the present invention, there is provided a first rotating body having a multi-rotatable gear,
A second rotator meshed with the gear and rotating at a lower speed than the first rotator; and first detection means for detecting a rotation angle of the second rotator, wherein the first detection means The rotation angle of the first rotator is detected, and the rotation angle of the rotator capable of multi-rotation can be calculated without a large error.

According to a second aspect of the present invention, in the first aspect, the third rotating body meshes with the gear of the first rotating body and rotates at a higher speed than the first rotating body. And second detection means for detecting the rotation angle of the third rotating body are added, and the rotation angle of the first rotating body is detected by the first and second detection means. And has an effect that high-resolution detection can be performed.

According to a third aspect of the present invention, in the second aspect, the first detecting means and the second detecting means are magnetic detecting elements. This has the effect that the angle can be detected without contact.

According to a fourth aspect of the present invention, in the second or third aspect, the detection angle signal detected by the first detection means and the second detection means is subjected to serial signal processing. It is characterized by having an arithmetic circuit section, and has an effect that an angle can be calculated inside the device and communication can be made to the outside.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a perspective view showing a rotation angle detecting device according to Embodiment 1 of the present invention, FIG. 2 is an enlarged view of a second rotating body and a magnetic sensing element portion in FIG.
FIG. 3 is a block diagram showing the relationship between the first detecting means, the second detecting means, and the arithmetic circuit unit. 1 to 3,
1 is a first rotating body, 2 is a gear on the outer circumference of the first rotating body 1, 3 is a second rotating body, 4 is a gear of the second rotating body 3, 5 is a second rotating body 3 Built in the center of the
A magnet that rotates together with the second rotating body 3, 6 is a third rotating body, 7 is a gear on the outer periphery of the third rotating body 6, 8 is incorporated in a central portion of the third rotating body 6, A magnet 9 that rotates together with the third rotating body 6, and a rotating body 9 that connects the first rotating body 1 and the second rotating body 3, has a coaxial outer peripheral gear 10 and a lower inner gear 11. . Reference numeral 12 denotes a rotating body that is concentric with the first rotating body 1 and has a gear 13.

The gear 4 of the second rotating body 3 is composed of the gear 13 of the rotating body 12 and the gears 11 and 10 of the rotating body 9 in the first rotating body 1.
When the first rotating body 1 rotates, the second rotating body 3 rotates at a reduced speed at a speed ratio based on the ratio of the number of teeth of the gears 2, 10, 11, 13, and 4. Third rotating body 6
The gear 7 of the first rotating body 1 is a gear 10 on the outer circumference of the rotating body 9.
When the first rotating body 1 rotates, the third rotating body 6 rotates at a speed ratio according to the ratio of the number of teeth of the gears 2, 10, and 7.

A first detecting means 14 is disposed at a distance directly below the magnet 5 incorporated in the second rotating body 3, and has a magnet detecting element therein. Reference numeral 15 denotes a second detecting means which is disposed at a distance directly below the magnet 8 incorporated in the third rotating body 6, and has a magnetic detecting element therein. An arithmetic circuit 16 is connected to the first detecting means 14 and the second detecting means 15, and calculates a rotation angle from a respective output by a microcomputer (not shown) and outputs the result.
FIG. 4 is a diagram showing an example of a change in angle converted from the output of the first detecting means 14 and the second detecting means 15 when the first rotating body 1 rotates.

Next, a description will be given of a method of detecting the rotation angle of the rotating body with the above configuration. When the first rotating body 1 rotates, the first rotating body 1 rotates the rotating body 9 by the gear 2 on the outer periphery and the gear 10 on the outer periphery of the rotating body 9. The number of teeth of the gear 2 is a, the number of teeth of the gear 10 is b, the gear 11
, The number of teeth of the gear 13 is d, the number of teeth of the gear 4 is e,
Assuming that the number of teeth of the gear 7 is f, the rotating body 9 is the first rotating body 1
Rotates at a / b times the speed of The rotating body 9 rotates the rotating body 12, and the rotating body 12 is c / d with respect to the rotating body 9.
Spin at twice the speed. Next, the rotating body 12 is the second rotating body 3
Is rotated, and the second rotating body 3 is d /
Rotate at e times faster.

In view of the number of rotations, the first rotating body 1
Makes one rotation, the second rotating body 3 becomes (a / b) * (c /
d) rotate by * (d / e) = ((a * c) / (b * e)). Next, the rotating body 9 rotates the third rotating body 6, and the third rotating body 6
Of the rotating body 6 rotates at a speed of b / f times the rotating body 9. In terms of the number of rotations, when the first rotating body 1 makes one rotation, the second rotating body 3 rotates (a / b) * (b / f) = (a / f). At this time, the number of gear teeth a, b, c, d,
By appropriately selecting e and f, the second rotating body 3
Rotates at a sufficiently lower speed than the first rotator 1, and the third rotator 6 rotates at a sufficiently higher speed than the first rotator 1.

Since the first detecting means 14 is disposed immediately below the magnet 5 incorporated in the second rotating body 3, when the second rotating body 3 rotates, it penetrates the first detecting means 14. The direction of the magnetic force changes, and the output changes. Similarly, when the third rotating body 6 rotates, the second detecting means 15 also detects the detecting means 1.
The magnetic force passing through 5 changes, and the output changes. Furthermore, the first
The output of the first detection unit 14 and the second detection unit 15 are combined by the A / D converter of the microcomputer of the arithmetic circuit unit 16 so that the rotation of the first rotating body 1 from the initial position can be determined. From the output of the first detecting means 14, low-resolution angle detection of whether the rotation angle is
High-resolution angle detection of the rotation angle of the first rotating body 1 is performed in the second
Is calculated from the output of the detection means 15.

Here, assuming that the rotation speed of the second rotation body 3 is 0.2 rotations and the rotation speed of the third rotation body 6 is 4 rotations when the first rotation body 1 makes one rotation, FIG. Is obtained. In this case, the rotation angle of the first rotating body 1 can be detected up to 5 rotations. From this relationship, the rotation angle of the first rotator 1 is roughly detected from the output of the first detection means 14 by an A / D converter of a microcomputer in the arithmetic circuit section 16, and the second angle is calculated for the precise angle in the vicinity thereof. And is transmitted as a serial signal outside the apparatus.

In the above-described embodiment, the first
Describes the case where the second rotator 3 and the third rotator 6 are connected to the rotator 1, but the case where only the second rotator is connected to the first rotator 1. Is a rotation angle detecting device according to claim 1, which can detect a multi-rotation low-resolution rotation angle of the first rotating body 1. Further, when the number of teeth a, b, c, d, and e is appropriately set so that the rotation speed of the second rotating body 3 is rotated faster than that of the first rotating body 1, high resolution from the initial position can be obtained. The rotation angle can be detected.

Although the magnet is incorporated in the rotating body and the magnetic detecting element is used as the detecting means, a resistance sensor, a capacitance sensor, an optical sensor, an inductive sensor, or the like may be used as the detecting means. Further, a code may be provided on the rotating body and read.

Further, a first rotating body 1 and a second rotating body 3,
If the number of rotating bodies connecting the third rotating body 6 can be connected so that one of them rotates faster than the first rotating body 1 and the other rotates at a lower speed than the first rotating body 1, the number of the rotating bodies is larger than that of the above-described embodiment. More or less.

Further, the information which can be compared with the output of the detecting means 14 and the absolute angle of the first rotating body 1 is stored in the arithmetic circuit 16 in advance.
By preparing more than points, the absolute angle can be detected. In addition, if one or more pieces of information that can compare the outputs of the detecting means 14 and 15 with the absolute angle of the first rotating body 1 are prepared, it is possible to detect the absolute angle with higher resolution.

[0021]

As described above, according to the present invention, it is possible to realize a rotation angle detecting device capable of detecting the rotation angle of a rotating body that makes multiple rotations without generating a large error and with a simple calculation process. The advantageous effect described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rotation angle detection device according to a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the main part.

FIG. 3 is a block diagram showing a relationship among a first detection unit, a second detection unit, and an arithmetic circuit unit in the apparatus.

FIG. 4 is a waveform chart showing an example of an angle-converted change in the output of a first detection unit and a second detection unit in the apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st rotating body 2 Gear of outer periphery of 1st rotating body 3 2nd rotating body 4 Gear of outer circumference of 2nd rotating body 5 Magnet 6 3rd rotating body 7 Gear of outer circumference of 3rd rotating body Reference Signs List 8 Magnet 9 Rotating body 10 Gear on outer circumference of rotating body 11 Gear inside inner circumference of rotating body 12 Rotating body 13 Gear on outer circumference of rotating body 14 First detecting means 15 Second detecting means 16 Arithmetic circuit unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Susumu Nishimoto, Inventor 1006 Kazuma Kadoma, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd. (72) Inventor Toshihiro Nomura 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] A first rotating body having a multi-rotatable gear; a second rotating body meshed with the gear and rotating at a lower speed than the first rotating body; A rotation angle detection device, comprising: first detection means for detecting a rotation angle, wherein the first detection means detects a rotation angle of the first rotating body. 2. A third rotating body that meshes with a gear of the first rotating body and rotates at a higher speed than the first rotating body, and a second detection that detects a rotation angle of the third rotating body. 2. The rotation angle detecting device according to claim 1, further comprising means for detecting a rotation angle of the first rotating body by the first and second detection means. 3. The rotation angle detecting device according to claim 2, wherein said first detecting means and said second detecting means are magnetic detecting elements. 4. The rotation according to claim 2, further comprising an arithmetic circuit unit that performs serial signal processing on the detected angle signal detected by the first detection unit and the second detection unit. Angle detector.