JP2002340511A - Steering sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a compact, inexpensive steering sensor that can measure the absolute rotary angle of a steering wheel, using a single MR element. SOLUTION: The MR element has first and second magnetic flux detection elements 1 and 2 that are arranged at different angles. The first and second magnetic flux detection elements have first and second solenoid coils 3 and 4 inside as first and second magnetic flux generating means; the first magnetic flux detection element 1 outputs a third magnetic flux direction change waveform, where the magnetic flux of the permanent magnet is superposed on the magnetic flux, due to magnetic field generated by the first solenoid coil 3; the second magnetic flux detection element 2 outputs a fourth magnetic flux direction change waveform where the magnetic flux in the permanent magnet is superposed on the magnetic flux by a magnetic field generated by the second solenoid coil 4. This combination of one MR element and one permanent magnet generates absolute rotary angle information of 360 deg. and the absolute rotary angle information of the steering wheel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering angle sensor for generating a rotation angle of a steering wheel of an automobile, and a rotary connector device incorporating the steering angle sensor and incorporating the steering angle sensor.

[0002]

2. Description of the Related Art As a prior art of a steering angle sensor for generating a rotation angle of a steering wheel of an automobile, for example,
JP-A-2000-283704, JP-A-2000-2
The technique disclosed in 83705 and the like is known.

[0003] The above-mentioned prior art uses two sets of rotation angle detecting means, which are a combination of a disk-shaped magnet that rotates with the rotation of a steering wheel and an MR element (magnetic resistance element) that detects the direction of the magnetic flux of the magnet. And generates absolute rotation angle information of the steering wheel from rotation angle information of the steering wheel generated by each MR element. This rotation angle detection means can only generate rotation angle information from 0 ° to 180 ° due to its configuration. Therefore, the rotation angle information of the two sets of rotation angle detection means is combined, and This is to generate rotation angle information of the steering wheel.

Incidentally, the absolute rotation angle information of the steering wheel can always generate the rotation angle information of the steering wheel without requiring the information to be compared relatively. Therefore, for example, the key of the vehicle is inserted, and the turning angle information of the steering wheel can be obtained from the time when the power of the vehicle is turned on.
On the other hand, the relative rotation angle information is to generate relative rotation angle information of the steering wheel from information to be compared relatively. Therefore, for example, the key of the vehicle is inserted, and the rotation angle information of the steering wheel cannot be obtained from the time when the power of the vehicle is turned on. Then, when the steering wheel rotates by a predetermined amount of rotation or more, relative rotation angle information of the steering wheel can be obtained.

[0005]

In the above-mentioned prior art, as described above, two MR elements are required, which is one of the problems in reducing the size and cost of the steering angle sensor. I have. If a steering angle sensor having the same performance can be realized with one MR element, the MR element and its surrounding electronic circuits, magnets, mechanical components for transmitting the rotation of the steering wheel to the magnet, and the like can be reduced. Points can be reduced. As a result, the size of the steering angle sensor can be reduced, and the cost of parts and the manufacturing cost of the steering angle sensor can be significantly reduced. Also,
There is also an advantage that the circuit configuration and the mechanical structure are simplified, thereby reducing the failure rate of the steering angle sensor.

The present invention has been made in view of such a situation, and an object thereof is to realize a steering angle sensor capable of generating absolute rotation angle information of a steering wheel with one MR element. It is another object of the present invention to realize a steering angle sensor having a lower failure rate while enabling further miniaturization and cost reduction.

[0007]

In order to achieve the above object, an invention according to claim 1 of the present application is directed to a permanent magnet having a substantially disc shape, which rotates in conjunction with the rotation of a steering wheel, and comprises: A first magnetic flux detecting element capable of converting a change in magnetic flux generated by rotation of the permanent magnet into a voltage signal and outputting the voltage signal as a first magnetic flux direction change waveform, and arranged at a different angle from the first magnetic flux detecting element; Convert the change in magnetic flux caused by the rotation of the permanent magnet into a voltage signal,
One MR element having a second magnetic flux detecting element that can be output as a second magnetic flux direction change waveform;
The R element converts the magnetic flux component generated by the first magnetic flux generating means disposed inside the first magnetic flux detecting element into the first magnetic flux.
And outputs a third magnetic flux direction change waveform superimposed on the second magnetic flux direction change waveform. The second magnetic flux generation means disposed inside the second magnetic flux detection element converts the magnetic flux component into the second magnetic flux direction change waveform. A configuration in which the fourth magnetic flux direction change waveform is superimposed on the direction change waveform and output as a fourth magnetic flux direction change waveform, and the first magnetic flux direction change waveform and the second magnetic flux direction change waveform are compared with each other to obtain 0 ° to A rotation angle of 180 ° is calculated, and a fifth magnetic flux direction change waveform obtained by subtracting the fourth magnetic flux direction change waveform from the third magnetic flux direction change waveform; the third magnetic flux direction change waveform; By comparing and calculating the sixth magnetic flux direction change waveform obtained by adding the magnetic flux direction change waveform to the sixth magnetic flux direction change waveform, the rotation angle is a rotation angle in a range of 0 ° to 180 ° or a rotation angle of 180 ° to 360 °. Judge whether it is the rotation angle of the, When it is determined that the rotation angle is in the range of 80 ° to 360 °, a steering angle sensor that generates 360 ° absolute rotation angle information of the steering wheel by adding a rotation angle of 180 ° to the rotation angle. It is.

A first magnetic flux direction change waveform due to a change in a magnetic flux direction of a permanent magnet is provided by an MR element having a magnetic flux generating means such as an electromagnetic coil therein and two magnetic flux detecting elements arranged at different angles. In addition to the second magnetic flux direction change waveform, it is possible to generate a third magnetic flux direction change waveform and a fourth magnetic flux direction change waveform on which a change component of the magnetic flux direction due to an electromagnetic coil or the like is superimposed. By comparing the third magnetic flux direction change waveform with the fourth magnetic flux direction change waveform, the rotation calculated by comparing the first magnetic flux direction change waveform with the second magnetic flux direction change waveform is calculated. Whether the angle is a rotation angle in the range of 0 ° to 180 °,
It is possible to determine whether the rotation angle is in the range of 180 ° to 360 °. And thereby one M
With the R element, it is possible to generate 360 ° absolute rotation angle information.

Thus, according to the steering angle sensor according to the first aspect of the present invention, it is possible to realize a steering angle sensor capable of generating absolute rotation angle information of a steering wheel with one MR element. Thus, the operation and effect of enabling further reduction in size and cost of the steering angle sensor and realizing a steering angle sensor with a lower failure rate can be obtained.

According to a second aspect of the present invention, in the first aspect, the steering angle sensor is configured to transmit a rotation of the steering wheel, a first gear mounted on the steering wheel, and the permanent magnet. And a second gear attached to the permanent magnet, wherein the first gear and the second gear are engaged to transmit the rotation of the steering wheel to the permanent magnet. This is a steering angle sensor characterized by the following.

As described above, according to the steering angle sensor according to the second aspect of the present invention, in addition to the operation and effect according to the first aspect of the present invention, the transmission mechanism of the steering wheel by the two gears is used. By transmitting the rotation to the permanent magnet and configuring the permanent magnet to rotate in conjunction with the rotation of the steering wheel, the rotation ratio between the steering wheel and the permanent magnet can be set to a predetermined rotation ratio in advance. Is obtained.

According to a third aspect of the present invention, in the second aspect, the steering angle sensor includes the first gear and the second gear.
And at least one reduction gear between the gears.

As described above, according to the steering angle sensor according to the third aspect of the present invention, in addition to the operation and effect according to the second aspect of the present invention, the first gear attached to the steering wheel can be used. , The second attached to the permanent magnet
With a configuration in which a reduction gear is interposed between the gears, the width of the rotation ratio between the settable steering wheel and the permanent magnet can be widened, and a 360 ° rotation that can be generated from the output of the MR element can be achieved. Within the range of the absolute rotation angle information,
The operation and effect that the absolute rotation angle information of the steering wheel exceeding 360 ° can be generated is obtained. Thus, it is possible to make a configuration in which the permanent magnet makes exactly one rotation within the rotation range of the steering wheel in the maximum steering range of the wheel.

According to a fourth aspect of the present invention, in the first or second aspect, the steering angle sensor calculates absolute rotation angle information of the steering wheel based on a reference rotation position of the steering wheel stored in advance. A steering angle sensor comprising means for calculating and generating the steering angle.

As described above, according to the steering angle sensor according to the fourth aspect of the present invention, in addition to the operation and effect according to the second aspect of the present invention, the reference rotation position of the steering wheel is set in advance. By having a means for calculating and calculating the absolute rotation angle information of the steering wheel from the reference rotation position and the 360 ° absolute rotation angle information generated from the output of the MR element,
The operation and effect that the absolute rotation angle information of the steering wheel exceeding 0 ° can be generated is obtained.

[0016] The invention described in claim 5 of the present application is the first to fifth aspects of the present invention.
A steering connector incorporating a steering angle sensor according to any one of the preceding claims, wherein the rotary connector device incorporates a steering angle sensor.

According to a rotary connector device with a built-in steering angle sensor according to a fifth aspect of the present invention, in the rotary connector device with a built-in rudder angle sensor, any one of the aforementioned first to fourth aspects of the present invention. The operation and effect according to the invention can be obtained.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a configuration of an MR element provided in a steering angle sensor according to the present invention.

The MR element comprises a first magnetic flux detecting element 1
And a second magnetic flux detecting element 2. The two magnetic flux detecting elements are arranged at different angles, and as shown, the angle is about 45 °. When a permanent magnet (not shown) rotates on the magnetic flux direction detection surface of the MR element in conjunction with the rotation of the steering wheel, the magnetic flux direction W on the magnetic flux direction detection surface of the MR element changes. The first magnetic flux detecting element 1 and the second magnetic flux detecting element 2 detect the change in the magnetic flux direction W, convert the change into an electric signal, and output the electric signal. Here, V1 indicates the output voltage of the first magnetic flux detection element 1, and V2 indicates the output voltage of the second magnetic flux detection element 2.

Further, the first magnetic flux detecting element 1 has a built-in first electromagnetic coil 3 as a magnetic flux generating means, and the second magnetic flux detecting element 2 has a second electromagnetic coil as a magnetic flux generating means. 4 built-in. When the first electromagnetic coil 3 and the second electromagnetic coil 4 are energized, the first electromagnetic coil 3 generates a magnetic flux in the direction of the arrow indicated by reference numeral B1, and the second electromagnetic coil 4 , Code B2
A magnetic flux is generated in the direction of the arrow shown by. Note that Vv indicates the power supply voltage of the first magnetic flux detecting element 1 and the second magnetic flux detecting element 2.

FIG. 2 is a graph showing a first magnetic flux direction change waveform and a second magnetic flux direction change waveform output by the MR element provided in the steering angle sensor according to the present invention.

Since the first magnetic flux detecting element 1 and the second magnetic flux detecting element 2 are arranged at different angles, they output voltage signals having waveforms having different phases. here,
Assuming that the voltage waveform of the first magnetic flux direction change waveform output by the first magnetic flux detection element 1 is Vsin and the voltage waveform of the second magnetic flux direction change waveform output by the second magnetic flux detection element 2 is Vcos, Vsin And the voltage waveform of Vcos is shown in FIG.
The voltage waveform shown in FIG. In the graph shown in the figure, the vertical axis indicates the output voltage of the magnetic flux detecting element, and the horizontal axis indicates the angle α in the magnetic flux direction. Since the first magnetic flux detecting element 1 and the second magnetic flux detecting element 2 are arranged with a 45 ° angle shift, the output voltage waveforms of Vsin and Vcos have a 45 ° phase shift. . Further, the waveforms of Vsin and Vcos from 0 ° to 180 °, and 1
The waveforms of Vsin and Vcos from 80 ° to 360 ° are the same.

Therefore, by comparing and calculating the two magnetic flux direction change waveforms having different phases, the absolute rotation angle information of the steering wheel that can be generated is 0 ° to 1 °.
Up to 80 °. As can be seen from the graph in FIG.
The absolute rotation angle information of the steering wheel that can be generated by comparing and calculating two magnetic flux direction change waveforms having different phases is 0 ° to 180 ° at 360 ° per rotation.
This is because the rotation angle of 180 ° to 360 ° becomes the same rotation angle information and cannot be distinguished.

FIG. 3 is a graph showing a third magnetic flux direction change waveform and a fourth magnetic flux direction change waveform output by the MR element provided in the steering angle sensor according to the present invention.

As described above, the first magnetic flux detecting element 1 has the first electromagnetic coil 3 as first magnetic flux generating means inside, and the second magnetic flux detecting element 2
A second electromagnetic coil 4 as a second magnetic flux generating means therein
have. By energizing the first electromagnetic coil 3 and the second electromagnetic coil 4, the first magnetic flux detecting element 1 and the second magnetic flux detecting element 2 have electromagnets inside. And thereby, the first
Output the third magnetic flux direction change waveform in which the magnetic flux of the permanent magnet and the magnetic flux generated by the magnetic field generated by the first electromagnetic coil 3 are superimposed. A fourth magnetic flux direction change waveform in which the magnetic flux of the magnet and the magnetic flux generated by the magnetic field generated by the second electromagnetic coil 4 are superimposed is output.

Here, assuming that the voltage waveform of the third magnetic flux direction change waveform is ΔVsin and the voltage waveform of the fourth magnetic flux direction change waveform is ΔVcos, the voltage waveforms of ΔVsin and ΔVcos are shown in the graph of FIG. It becomes a voltage waveform. As described above, ΔVsin is a magnetic flux B1 (FIG. 1) in a direction that is a fixed reference with respect to the direction W (FIG. 1) of the magnetic flux changed by the rotation of the permanent magnet due to the magnetic field generated by the first electromagnetic coil 3. ) Is superimposed. Also, ΔVco
Similarly, s is a magnetic flux B2 (FIG. 1) in a fixed reference direction with respect to the direction W of the magnetic flux changed by the rotation of the permanent magnet due to the magnetic field generated by the second electromagnetic coil 4.
Are superimposed on each other.

The magnetic fluxes B1 and B generated by energizing the first electromagnetic coil 3 and the second electromagnetic coil 4
2 is a very small magnetic flux level as compared with the magnetic flux W generated by the permanent magnet. Therefore, the voltage waveforms of ΔVsin and ΔVcos shown in FIG. 3 are voltage waveforms obtained by amplifying only the superimposed component by the electromagnetic coil.

As described above, the first magnetic coil 3 and the second magnetic coil 4 built in the first magnetic flux detecting element 1 and the second magnetic flux detecting element 2 serve as a reference in a certain direction. It is possible to obtain voltage waveforms of ΔVsin and ΔVcos in which the magnetic flux directions are superimposed. Then, based on the voltage waveforms of ΔVsin and ΔVcos, one MR element provided in the steering angle sensor according to the invention of the present application shows that
The process of generating the absolute rotation angle information of 0 ° will be described below.

FIG. 4 shows a fifth magnetic flux direction change waveform obtained by subtracting the voltage waveform of ΔVcos from the voltage waveform of ΔVsin and ΔVsin.
13 is a graph showing a sixth magnetic flux direction change waveform obtained by adding the voltage waveform of ΔVcos to the voltage waveform of FIG.

The fifth magnetic flux direction change waveform ΔVsin− is obtained by subtracting the voltage waveform ΔVcos from the voltage waveform ΔVsin.
The voltage waveform of ΔVcos is such that the angle α in the magnetic flux direction is 0 ° to 16 °.
Until the vicinity of 0 °, the region having a positive voltage value changes, and from around 160 ° to approximately 340 °, the region of a negative voltage value changes.
In the range up to °, a graph of a voltage waveform changes again in a region having a positive voltage value. On the other hand, a voltage waveform of ΔVsin + ΔVcos as a sixth magnetic flux direction change waveform obtained by adding the voltage waveform of ΔVsin and the voltage waveform of ΔVcos has a region having a positive voltage value and a region having a negative voltage value as shown in the drawing. It becomes a graph of a voltage waveform that changes alternately. Then, the voltage waveform of L1 shown in FIG. 5 is generated from the voltage waveform of ΔVsin−ΔVcos, and the voltage waveform of L2 shown in FIG. 6 is generated from the voltage waveform of ΔVsin + ΔVcos.

FIG. 5 is a graph showing a voltage waveform L1 generated from the voltage waveform of ΔVsin−ΔVcos. The voltage waveform L1 is obtained by performing arithmetic processing on the voltage waveform of ΔVsin−ΔVcos shown in FIG. 4, converting all positive voltage values to a constant negative voltage value with a voltage value of 0 V as a boundary, and converting all negative voltage values to a constant value. Is a voltage waveform converted into a positive voltage value.

FIG. 6 is a graph showing a voltage waveform L2 generated from the voltage waveform of ΔVsin + ΔVcos. The voltage waveform L2 is the same as the voltage waveform L1, and ΔVsin shown in FIG.
This is a voltage waveform obtained by performing arithmetic processing on a voltage waveform of + ΔVcos, converting all positive voltage values to a constant positive voltage value with a voltage value of 0 V as a boundary, and converting all negative voltage values to a constant negative voltage value. .

FIG. 7 shows a voltage waveform L3 generated from the voltage waveform L1 and the voltage waveform L2. Voltage waveform L
In FIG. 1, the point of voltage change is that the angle α in the magnetic flux direction is 16
A point near 0 ° and a point where the angle α in the magnetic flux direction is near 340 °. On the other hand, in the voltage waveform L2, the voltage value at the point where the angle α in the magnetic flux direction is around 160 ° is a negative voltage value, and the voltage value at the point where the angle α in the magnetic flux direction is around 340 ° is a positive voltage value. It is. That is, in a range of 0 ° to 360 °, a voltage waveform L1 having two voltage change points having an interval of about 180 ° and a voltage waveform L2 having different voltage polarities at the two voltage change points are calculated by an arithmetic process. The voltage waveform L3 can be generated.

The voltage waveform L3 has an angle α in the magnetic flux direction of 0 °.
It has a constant positive voltage value in the region of 180 ° to 180 °, and has a constant negative voltage value in the region of 180 ° to 360 ° in the magnetic flux direction. That is, it is possible to determine from the voltage waveform L3 whether the angle α in the magnetic flux direction is in the range of 0 ° to 180 ° or in the range of 180 ° to 360 °. Therefore, Vsin and Vc
It is possible to generate 360 ° absolute rotation angle information from the absolute rotation angle information from 0 ° to 180 ° based on the voltage waveform of os and the voltage waveform L3.

FIG. 8 is a graph showing the relationship between the voltage waveforms of Vsin and Vcos.
5 is a graph showing a relationship between absolute rotation angle information from ° to 180 ° and an angle α in a magnetic flux direction. Thus, 0 °
The absolute rotation angle (vertical axis of the graph) that can be generated by calculating from the voltage waveforms of Vsin and Vcos with respect to the angle α in the magnetic flux direction (horizontal axis of the graph) of up to 360 ° is 0 to 180 °. Therefore, the graph when the angle α of the magnetic flux direction is 0 ° to 180 ° and the graph when the angle α is 180 ° to 360 ° are the same graph.

Therefore, when the angle α in the magnetic flux direction is an angle between 180 ° and 360 °, that is, when the voltage value of the voltage waveform L3 is minus, The absolute rotation angle information from 0 ° to 180 ° based on the voltage waveforms of Vsin and Vcos shown in FIG.
By adding 80 °, 360 ° shown in FIG. 9 is obtained.
Can be generated.

FIG. 10 shows a schematic configuration of a steering angle sensor according to the present invention. The steering angle sensor is configured to transmit a rotation of a steering wheel (not shown) to a first gear 12 attached to a steering shaft 11.
And a second gear 14 attached to the permanent magnet 13. In this embodiment, the first gear 1
The second and second gears 14 are engaged via a reduction gear 16 so as to transmit the rotation of the steering wheel to the permanent magnet 13. Further, from the ratio of the number of teeth between the first gear 12 and the reduction gear 16 and the ratio of the number of teeth between the second gear 14 and the reduction gear 16, the permanent rotation range of the steering wheel at the maximum steering angle width of the wheel is determined. The configuration is such that the magnet 13 rotates exactly 360 °. Then, the arithmetic processing unit 17 connected to the MR element 15 performs the arithmetic processing for generating the above-described 360 ° absolute rotation angle information.

As described above, the steering angle sensor shown in the present embodiment has a configuration capable of generating 360 ° absolute rotation angle information by a combination of one permanent magnet 13 and one MR element 15. The rotation of the steering wheel is transmitted to the permanent magnet 13 via the reduction gear 16. Also, since the permanent magnet 13 is configured to rotate exactly 360 ° in the rotation range of the steering wheel at the maximum steering angle width of the wheel, one permanent magnet 13 and one permanent magnet 13 are rotated.
In combination with the two MR elements 15, a steering angle sensor capable of generating absolute rotation angle information of the steering wheel exceeding 360 ° can be configured. This makes it possible to further reduce the size and cost of the steering angle sensor, and at the same time, one permanent magnet 13 and one MR
The simple configuration of the element 15 makes it possible to realize a steering angle sensor with a lower failure rate.

As another embodiment, the present invention has a combination of one permanent magnet 13 and one MR element 15 as described above, and uses the reference rotational position of the steering wheel stored in advance as a reference to adjust the steering wheel. One having means for calculating and generating absolute rotation angle information may be used.

This is because one permanent magnet 13 and one MR
In addition to the configuration capable of generating 360 ° absolute rotation angle information in combination with the element 15, calculating and generating the absolute rotation angle information of the steering wheel based on the reference rotation position of the steering wheel stored in advance. Thus, it is possible to generate absolute rotation angle information exceeding 360 °. This gives 3
A steering angle sensor capable of generating absolute rotation angle information of a steering wheel exceeding 60 ° can be configured, and the operation effect of the present invention can be obtained in the steering angle sensor.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the invention described in the claims, which are also included in the scope of the present invention. Needless to say,

[0042]

According to the present invention, a steering angle sensor capable of generating absolute rotation angle information of a steering wheel with one MR element is realized, and the steering angle sensor can be further reduced in size and cost. In addition, a steering angle sensor having a lower failure rate can be realized.

[Brief description of the drawings]

FIG. 1 schematically shows a configuration of an MR element provided in a steering angle sensor according to the present invention.

FIG. 2 is a graph showing a first magnetic flux direction change waveform and a second magnetic flux direction change waveform output by an MR element provided in the steering angle sensor according to the present invention.

FIG. 3 is a graph showing a third magnetic flux direction change waveform and a fourth magnetic flux direction change waveform output by an MR element provided in the steering angle sensor according to the present invention.

FIG. 4 is a graph showing a sixth magnetic flux direction change waveform obtained by adding a fifth magnetic flux direction change waveform obtained by subtracting a ΔVcos voltage waveform from a ΔVsin voltage waveform, a ΔVsin voltage waveform, and a ΔVcos voltage waveform; It is.

FIG. 5 is a graph showing a voltage waveform L1 generated from a voltage waveform of ΔVsin−ΔVcos.

FIG. 6 is a graph showing a voltage waveform L2 generated from a voltage waveform of ΔVsin + ΔVcos.

FIG. 7 shows a voltage waveform L3 generated from the voltage waveform L1 and the voltage waveform L2.

FIG. 8: 0 ° to 180 ° according to voltage waveforms of Vsin and Vcos
6 is a graph showing the relationship between the absolute rotation angle information up to and the angle α in the magnetic flux direction.

FIG. 9 is a graph showing a relationship between 360 ° absolute rotation angle information and an angle α of a magnetic flux direction.

FIG. 10 shows a schematic configuration of a steering angle sensor according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st magnetic flux detection element 2 2nd magnetic flux detection element 3 1st electromagnetic coil 4 2nd electromagnetic coil 11 Steering shaft 12 1st gear 13 Permanent magnet 14 2nd gear 15 MR element 16 Reduction gear 17 Calculation Processing unit W Magnetic flux direction α Angle of magnetic flux direction B1 Magnetic flux direction generated by first electromagnetic coil B2 Magnetic flux direction generated by second electromagnetic coil

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takeshi Ishimasa 5-2931, Urago-cho, Yokosuka City, Kanagawa Prefecture Bosch Brake System Co., Ltd. F-term (reference) 2F063 AA36 BA08 BB03 BC04 BD16 CA34 CA40 DA01 DB07 DC03 DD02 DD03 DD08 EA03 GA29 GA52 GA58 KA05 LA02 LA03 LA11 LA22 LA23 ZA01 2F077 AA49 DD05 JJ01 JJ06 JJ09 JJ23 TT06 TT21 TT52 3D033 CA17 CA29

Claims (5)

[Claims] 1. A permanent magnet having a substantially disk shape, which rotates in conjunction with rotation of a steering wheel, and converts a change in magnetic flux generated by the rotation of the permanent magnet into a voltage signal to generate a first magnetic flux direction. A first magnetic flux detecting element that can be output as a change waveform; and a first magnetic flux detecting element that is arranged at a different angle from the first magnetic flux detecting element, converts a change in magnetic flux generated by rotation of the permanent magnet into a voltage signal, and converts the change into a second magnetic flux direction. One MR element having a second magnetic flux detecting element capable of outputting a change waveform, wherein the MR element is a magnetic flux component generated by first magnetic flux generating means disposed inside the first magnetic flux detecting element. Is superimposed on the first magnetic flux direction change waveform and is output as a third magnetic flux direction change waveform, and is output by a second magnetic flux generation means disposed inside the second magnetic flux detection element. A configuration in which the flux component is superimposed on the second magnetic flux direction change waveform and is output as a fourth magnetic flux direction change waveform, wherein the first magnetic flux direction change waveform and the second magnetic flux direction change waveform are By performing a comparison operation, a rotation angle of 0 ° to 180 ° is calculated, and a fifth magnetic flux direction change waveform obtained by subtracting the fourth magnetic flux direction change waveform from the third magnetic flux direction change waveform;
And the sixth magnetic flux direction change waveform obtained by adding the fourth magnetic flux direction change waveform to the fourth magnetic flux direction change waveform, the rotation angle is a rotation angle in a range of 0 ° to 180 °. Or a rotation angle in the range of 180 ° to 360 °, and when it is determined that the rotation angle is in the range of 180 ° to 360 °, the rotation angle is set to 180 °.
A steering angle sensor that generates 360 ° absolute rotation angle information of the steering wheel by adding the rotation angles of the steering wheel. 2. The steering angle sensor according to claim 1,
A first gear attached to the steering wheel and a second gear attached to the permanent magnet so as to transmit rotation of the steering wheel;
And the second gear is engaged to transmit the rotation of the steering wheel to the permanent magnet. 3. The steering angle sensor according to claim 2,
A steering angle sensor comprising a configuration in which at least one or more reduction gears are provided between the first gear and the second gear. 4. The steering angle sensor according to claim 2,
A steering angle sensor comprising means for calculating and generating absolute rotation angle information of the steering wheel based on a reference rotation position of the steering wheel stored in advance. 5. A rotary connector device incorporating a steering angle sensor, comprising the steering angle sensor according to any one of claims 1 to 4.