JPH06221835A - Rotary angle detector - Google Patents

Abstract

PURPOSE:To provide a rotary angle detector which can positively and immediately judge the reference position of steering. CONSTITUTION:A rotator 14 with a plurality of protruding parts which rotate in step advance by a specific angle for each rotation of a rotator 15 rotating along with the rotation of a steering is provided between the second through hole 10b and second sensor 12 for detecting N position and then the third through hole 13a is provided at a position corresponding to the second through hole 10b and the second sensor 12 at a specific protruded part of the rotator 14, thus improving the accuracy for detecting the N position estimated as the inclination of electronic parts and the center value of the inclination section is output as the calculation result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation angle detecting device having a function of detecting a reference position of a steering steering angle of a vehicle.

[0002]

2. Description of the Related Art The structure of a conventional rotation angle detecting device is shown in FIG. In the figure, reference numeral 1 denotes a disk, which has a first through hole array 1a provided at a predetermined pitch and an arc-shaped second through hole 1b arranged concentrically with the through hole array 1a. , Is fixed to the rotor 2. 3 is the first through hole array 1a
Is a first sensor formed of a transmissive photointerrupter in which a light emitting element and a light receiving element are opposed to each other, and 4 is a first sensor 3 provided corresponding to the second through hole 1b. It is a second sensor having a structure similar to. The rotor 2, the first sensor 3, and the second sensor 4 are housed in a case 5, and the rotor 2 is configured to freely rotate in association with the rotation of the steering of a vehicle or the like.

Next, the mutual relationship and operation of the respective constituent elements of the above conventional example will be described. In the above conventional example, when the steering of the vehicle is operated, the rotor 2 is interlocked with it.
Rotates, the disk 1 fixed to the rotor 2 rotates,
The first sensor 3 detects the number of the through holes 1a of the disc 1. Since the through holes 1a are provided with a predetermined angular pitch in advance, the rotation angle of the steering wheel can be measured by counting the number of the through holes 1a.

Further, the through hole 1b is for detecting a reference position of the steering (the steering is in a straight state, which is referred to as N position), and the center of the opening angle of the through hole 1b coincides with the N position. ing. The left end or the right end of the arc-shaped opening of the through hole 1b is detected by the second sensor 4 and is corrected by a half of the opening angle to determine the N position.

[0005]

However, in the above-described conventional rotation angle detecting device, even when the steering wheel rotates one rotation (360 degrees) or more, the through hole 1b and the second
Since there is a state in which the relationship of the sensor 4 is exactly the same as the correct N position, the true N position cannot be immediately determined when used in a vehicle steering that normally rotates about 2.5 turns left and right. was there.

The present invention solves such a conventional problem, and the N position of the steering wheel is changed by a simple mechanism.
It is an object of the present invention to provide a rotation angle detection device that can surely and immediately determine.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a single rotation of a rotor which is rotated by rotation of a steering wheel between a second through hole for N position detection and a second sensor. Each time, a rotating body having a plurality of protrusions that rotate stepwise by a predetermined angle is provided, and a predetermined protrusion of the rotating body is provided with a second position at a position corresponding to the second sensor and the second through hole. It has a configuration in which three through holes are provided.

[0008]

According to the present invention, with the above-described structure, the rotating body having the third through hole only on the specific protrusion is arranged between the second sensor and the second through hole of the disc, thereby the steering is performed. When the rotor is rotated one rotation or more from the N position, the rotor is stepwise rotated by the rotor, and the protrusion having no through hole of the rotor is interposed between the second sensor and the second through hole of the disc.
It acts to block the optical path of the second sensor to prevent erroneous N position detection.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing the configuration of the main part of a rotation angle detecting device according to an embodiment of the present invention. As shown in the figure, this device includes a plurality of first through holes 10a arranged at a predetermined interval in the circumferential direction and a first through hole and a second through hole provided in an arc shape on a circle. Disc 1 with holes 10b
0, a first sensor 11 including a light emitting element and a light receiving element which are arranged to face each other, and which is a transmissive photointerrupter for detecting the first through hole 10a, and a second through hole 10b. A second sensor 12 having the same structure as the first sensor for detecting, and a second sensor 12 arranged between the light emitting element and the light receiving element of the second sensor 12
Projections 1 that selectively shield the detection of the through holes 10b of the
3 and the second sensor 1 is provided on one of the protrusions 13.
2 and the second through hole 10b, the rotating body 14 having the third through hole 13a at a position corresponding to the second and the second through hole 10b, and the rotating body 14 having the disc
The rotor 15 is provided with a projection or a recess for rotating a predetermined angle for each rotation of 0 and holds the disk 10 rotatably.

Next, the mutual relationship and operation of each component of the above embodiment will be described with reference to FIG. FIG. 2A shows the relative position of each sensor and each through hole of the disk in the rotation angle detecting device in the straight traveling state of the vehicle, that is, in the reference state where the steering is not turned (N position). In this state, the center of the opening angle of the second through hole 10b for detecting the N position of the disk 10, the second sensor 12, and the protrusion 1 of the rotating body 14 are formed.
The third through hole 13a provided in the No. 3 is aligned in the direction perpendicular to the paper surface. Therefore, the second sensor 12 can detect the second through hole 10b of the disk 10 through the third through hole 13a.

When the steering wheel is rotated counterclockwise in this state from this state, the rotating pair 14 does not rotate because both ends of the protrusion 13 are in contact with the outer peripheral portion of the rotor 15,
Only the rotor 15 and the disk 10 rotate in conjunction with the steering, and the second sensor 12 detects the right end portion of the second through hole 10b of the disk 10. By correcting the angle detected by the first sensor 11 of the first through hole 10a at this time by the opening angle of the second through hole 10b, N
The position can be determined. When the steering wheel is further turned counterclockwise, the rotor 15 is rotated in synchronization with the steering operation.
As shown in (b), the projection 13 of the rotor 14 contacts the wall 15a provided on the rotor 15, and the rotor 14 starts rotating.

In this case, since the recess 15b is provided along the wall 15a of the rotor 15, the protrusion 13 of the rotor 14 rotates while engaging with the recess 15b (see FIG. 2 (c)). Further rotate the steering wheel to
When rotated 360 degrees from the reference state of (a), FIG.
It becomes the state of. In this state, the rotating body 14 is shown in FIG.
Since it rotates exactly 90 degrees from the state of
The protrusion 13 not provided with the third through hole 13a is interposed between the second sensor 12 and the disk 10, and the second sensor 12 is connected to the second through hole 1 of the disk 10.
0b cannot be detected. That is, erroneous N position detection is prevented.

As described above, according to this embodiment, the N position can be detected only when the rotating body 14 is in the state shown in FIG. 2A, and the steering wheel makes one to three revolutions from this state. In the state (the tire is in a broken state), the N position signal is not erroneously detected. Therefore, even if the sensor is started from the steering turned state (for example, the state of FIG. 2D), the first signal generated by the second sensor 12 is the N position detection correction signal. Since the judgment can be made, the N position can be immediately known.

[0015]

As is apparent from the above-described embodiment, the present invention is provided with a rotating body which is stepwise rotated by the rotation of the rotor,
Since the sensor is selectively operated through the through hole provided in the protrusion provided on the rotating body, there is an effect that the N position can be definitely detected even when the steering wheel rotates one or more times. Further, since the rotating body is driven by the recessed portion provided in the rotor, it is possible to provide a rotation angle detecting device that is reliable in operation and has a simple structure.

[Brief description of drawings]

FIG. 1A is a schematic side sectional view showing a configuration of a main part of a rotation angle detection device according to an embodiment of the present invention, and FIG. 1B is a schematic plan view showing the configuration.

FIG. 2A to FIG. 2D are schematic plan views for explaining a relative positional relationship between main parts associated with steering rotation in the same device.

FIG. 3A is a schematic side sectional view showing a configuration of a main part of a conventional rotation angle detection device. FIG. 3B is a schematic plan view showing the configuration.

[Explanation of symbols]

 10 disk 10a 1st penetration hole 10b 2nd penetration hole 11 1st sensor 12 2nd sensor 13 projection part 13a 3rd penetration hole 14 Rotating body 15 Rotor

Claims (1)

[Claims] 1. A disk having a plurality of first through holes arranged at a predetermined interval in a circumferential direction and second through holes arranged in an arc shape, and a first light emitting element and a light receiving element. First sensor for detecting the through hole of the second sensor, a second sensor for detecting the second through hole, and the second sensor disposed between the light emitting element and the light receiving element of the second sensor. A plurality of protrusions for selectively blocking the detection of the second through-hole by the sensor, and one of the protrusions has a second position at a position corresponding to the second sensor and the second through-hole. Rotation angle including a rotating body having three through holes, and a rotor provided with a member for rotating the rotating body by a predetermined angle for one rotation of the disk and holding the disk rotatably Detection device.