JPH09318305A - Position detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position detector which enables obtaining of a highly accurate output from a sensor. SOLUTION: Hall elements 21 and 22 detect an angle of rotation of a rotor 80 utilizing magnetic fluxes of permanent magnets 15 and 16 and a photo- interrupter 90 outputs a specified signal utilizing light. As a result, there is no substantial deviation in a specified signal obtained by the photo-interrupter 90 otherwise caused by magnetic fluxes of the permanent magnets 15 and 16 and detection signals of the Hall elements 21 and 22 and a specified signal of the photo-interrupter 90 can be obtained as highly accurate outputs. This enables simple and accurate detection of troubles of the Hall elements 21 and 22 by comparing the detection signals (V1 and V2) obtained by the Hall elements 21 and 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detecting device for detecting the position of an object, and its application is, for example, operation of an accelerator pedal operated by a driver to control the traveling speed of an automobile. It is used for the accelerator pedal operation amount detection device that detects the amount.

[0002]

2. Description of the Related Art Conventionally, an accelerator pedal operation amount detecting device for detecting an operation amount of an accelerator pedal operated by a driver in order to control a traveling speed of an automobile is known as one of detecting the position of an object. is there. As an accelerator pedal operation amount detection device for detecting the operation amount of the accelerator pedal, a non-contact type accelerator pedal operation amount detection device by a magnetic detection method is known. An outline of a system including the accelerator pedal operation amount detecting device will be described with reference to FIG.

Reference numeral 100 denotes an accelerator pedal operation amount detecting device, and this accelerator pedal operation amount detecting device 100 includes:
A lever 100a that abuts a pedal rod 400 described later.
And a shaft (not shown) connected to the lever 100a, and a pair of arc-shaped permanent magnets (not shown) arranged in parallel along an arc centered on the rotation axis of the shaft.
And a Hall element (not shown) arranged between the permanent magnets.

Reference numeral 200 denotes an accelerator pedal. A rotary shaft 200a is provided at one end of the accelerator pedal 200, and the rotary shaft 200a is rotatably supported by the first support member 300. The other end of the accelerator pedal 200 is provided with an engaging portion 200b with which one end of a pedal rod 400 having a dogleg shape is engaged. Also,
A switch 500 that outputs a detection signal for detecting an idle position is provided at the other end of the pedal rod 400. The central portion of the pedal rod 400 contacts the protrusion 600a of the second support member 600,
00 is the pedal rod 40 with the protrusion 600a as the center.
The other end of 0 is rotatable in the direction away from the switch 500 and in the direction of the switch 500. That is, the pedal rod 400 moves in a direction in which the other end of the pedal rod 400 is separated from the switch 500 when the driver depresses the accelerator pedal 200.

The switch 500 is a contact type switch and outputs an idle signal for determining whether or not the accelerator pedal 200 is in a fully closed state (that is, an idle operation state). The idle signal of the switch 500 is used as a learning control base point for updating the minimum value of the linear output obtained by the hall element through a predetermined circuit. Also,
As another detection device for detecting the position of an object, there is a throttle position sensor disclosed in Japanese Unexamined Patent Publication No. Hei 5-26610, and according to this publication, a pair of opposed pairs of shafts sandwiching a rotation axis of a shaft are provided. A first detection magnet, which is made of a permanent magnet and forms a magnetic path from the facing surface of one magnet to the facing surface of the other magnet, and a pair arranged side by side along an arc centered on the rotation axis of the shaft. And a second detection magnet which is formed of an arc-shaped permanent magnet and forms a magnetic path from a side surface parallel to a surface orthogonal to the rotation axis of the shaft of one magnet to the same side surface of the other magnet. , Between the one permanent magnets forming the first detection magnet, and at a position separated from the side surface of the second detection magnet by a predetermined distance in the axial direction of the shaft,
There is known a so-called non-contact type detection device provided with first and second Hall elements that detect the direction of a magnetic field in a magnetic path formed by each magnet. In this device, the position of the object is detected by the first detection magnet and the first Hall element, and the idle operation state is detected by the second detection magnet and the second Hall element. Further, the first Hall element can obtain a linear output through a predetermined circuit, and the second Hall element can obtain an idle signal output through a predetermined circuit.

[0006]

However, in the former prior art, since the switch is arranged separately from the position detecting device, the number of parts inevitably increases. Therefore, the inventor has considered integrating the position detection device and the switch. For example, as in the latter conventional technique, the position of the target object is detected by the first detection magnet and the first hall element, and the target object is in a predetermined state by the second detection magnet and the second hall element. Although there is a method of detecting whether or not there is a problem, this method has a problem in that the magnetic fluxes of the magnets affect each other and the position cannot be accurately detected.

Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an accelerator pedal operation amount detection device which can obtain a highly accurate output from a sensor.

[0008]

[Means for Solving the Problems] In order to solve the above problems, the means described in claim 1 can be adopted. According to the means of the present invention, since the pair of magnets is fixed to the rotor and is provided so as to face the rotation axis of the rotor, the direction of the magnetic field in the formed magnetic path is the rotation axis of the rotor. Changes according to the rotation angle of. Therefore, the magnetoelectric conversion element arranged in the magnetic path of the pair of magnets generates a detection signal according to the movement of the object by detecting the magnetic field direction in this magnetic path. The rotation position signal output means detects the rotation position of the rotor and outputs a predetermined signal. That is, the magnetoelectric conversion element uses the magnetic flux of the magnet to detect the rotation angle of the rotating shaft of the rotor, and the rotational position signal output means is not affected by the magnetic flux of the magnet. Since the predetermined signal obtained by the output means does not significantly change, the detection signal of the magnetoelectric conversion element and the predetermined signal of the rotational position signal output means can be obtained as highly accurate outputs.

According to another aspect of the present invention, the rotational position signal output means includes a light emitting element for emitting light, a light receiving means for receiving light from the light emitting element, and a light emitting element and a light receiving element. It is provided with a shield plate fixed to the rotor. By blocking the light from the light emitting element with the shield plate, the rotor rotation position signal is output without affecting the magnetoelectric conversion element by the magnet. Therefore, the predetermined signal can be easily extracted.

According to the means of claim 3, the magnet is
A pair of arc-shaped magnets, which are arranged opposite to each other with the rotor rotation shaft sandwiched therebetween, and are fixed in a recess provided at the tip of the rotor rotation shaft, wherein the magnetoelectric conversion element is a pair of arc-shaped magnets. Since there are two magnetoelectric conversion elements arranged between them, 2
The detection signals obtained from the individual magnetoelectric conversion elements are substantially the same signals, and the failure of the magnetoelectric conversion elements can be easily detected simply by comparing the substantially same signals.

Further, according to the means of claim 4, since the shielding plate is formed in an arc shape around the rotation axis of the rotor and is provided on the rotor, the shield plate is accurately rotated according to the rotation of the rotation axis of the rotor. Since the predetermined signal of the signal output means can be obtained, the detection accuracy can be greatly improved. Further, since the detection signal obtained by the magnetoelectric conversion element and the predetermined signal obtained by the rotation position signal output means are obtained by the rotation of the rotation shaft of the rotor, the detection signal of the magnetoelectric conversion element and the rotation position signal output means are obtained. Accurately follows the predetermined signal of.

Further, according to the means of claim 5, the rotor, the magnet, the magnetoelectric conversion element,
By accommodating the rotational position signal output means, the number of parts can be significantly reduced and the size can be further reduced, as compared with the conventional position detecting device and switch which are separate. Further, according to the means of claim 6, since the rotational position signal output means is arranged on one surface of the printed circuit board, it is only necessary to assemble the respective members from one direction, which facilitates the assembly work.

According to the means of claim 7, claim 1
The position detecting device of any one of 1 to 6 can be used as a device for detecting the operation amount of the accelerator pedal. For this reason,
Similarly to claim 1, the magnetoelectric conversion element detects the rotation angle of the rotation axis of the rotor by utilizing the magnetic flux of the magnet, and the rotational position signal output means is not affected by the magnetic flux of the magnet. Therefore, the predetermined signal obtained by the rotational position signal output means does not significantly change, so the detection signal of the magnetoelectric conversion element and the predetermined signal of the rotational position signal output means are
It can be obtained as a highly accurate output.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, as one embodiment for detecting the position of an object of the present invention, an accelerator pedal for operating an operation amount of an accelerator pedal operated by a driver for controlling a traveling speed of an automobile. The operation amount detection device will be described. First, FIG. 1 is a cross-sectional view showing the internal configuration of the accelerator pedal operation amount detecting device of the present invention, and FIG. FIG. 3 is a schematic diagram showing a system including the accelerator pedal operation amount detecting device of the present invention in FIG. 1, and FIG. 4 is FIG.
FIG. 5 is a partial top view showing the vicinity of the hall element excluding the cover 39 and the like as seen from the direction A, and FIG. 5 is an exploded view of the accelerator pedal operation amount detection device of FIG.

As shown in FIGS. 1 to 5, the accelerator pedal operation amount detecting device of the present invention is provided with a resin-made hollow housing 1, and a resin dry bearing 3 is provided at the center of the housing 1. It is insert-molded in the housing 1. A shaft 5 (a rotating shaft in the present invention) is rotatably housed in the dry bearing 3. Further, at the lower end portion of the shaft 5 shown in FIG. 1, a roller 7b that receives the displacement amount of the accelerator pedal rod 400 shown in FIG.
The roller shaft 7a is provided on the outer periphery of the roller shaft 7a and is rotatable with respect to the roller shaft 7a.
The lever 7 is fixed to the tip of the shaft 5 by caulking.
A washer 11 is provided between the lever 7 and the shaft 5. In addition, the roller 7b is a pedal rod 400.
Are in contact.

A stepped hole 5a (a concave portion in the present invention) is formed at the center of the upper end of the shaft 5 in FIG. 1, and a rotating member 10 made of resin is provided on the outer periphery of the shaft 5, and the shaft 5 is provided. The rotor 80 is composed of the rotary member 10. As shown in FIGS. 1 and 4, in the stepped hole 5a, a pair of arc-shaped permanent magnets 15 and 16 made of a rare earth element such as Nd-Fe-B system are arranged facing each other with the shaft 5 as the center. It is set up.

The permanent magnets 15 and 16 are used for the accelerator pedal 4
A magnet for detecting a rotation angle for detecting the rotation angle of the rotor 80 which rotates according to the operation amount of 00, and is magnetized so as to form a magnetic path from one magnet surface toward the opposite magnet surface. . Further, the permanent magnets 15 and 16 are insert-molded together with the shaft 5 by the rotating member 80, and as a result, the magnets 15 and 16 are fixed to the stepped portion of the stepped hole 5 a of the shaft 5. The member 10 has an arcuate slit 10a centered on the shaft 5.
(Shielding plate in the present invention, position detection signal output means) is provided. The slit 10a is arranged between the light emitting element 90a and the light receiving element 90b of the photointerrupter 90 (position detection signal output means in the present invention) including a light emitting element 90a that emits light and a light receiving element 90b that receives the light. Then, the slit 10a blocks the light from the light emitting element 90a, and the photo interrupter outputs a predetermined signal. In addition, the rotating member 10 has a circular arc-shaped first protrusion 10 b and a second protrusion 1 with the shaft 5 as a center.
0c is provided, and the first protrusions 10b and 10c are
It projects in the direction opposite to the slit 10a, that is, in the lever 7 direction. The first and second protrusions 10b, 10
Reference numeral c is a stopper that restricts the rotation of the rotor 80 by coming into contact with a protrusion (not shown) of the housing 1.

Rotating member 10 of housing 1 and rotor 80
A spring 9 is provided between and. The hook 9a of the spring 9 is engaged with the first protrusion 10b of the rotary member 10, and the hook 9b is locked to the bottom of the housing 1. The spring 9 includes a lever 7 and a rotor 8 that rotate according to the amount of operation of the accelerator pedal 200.
0 is urged toward the closing direction of the accelerator pedal 200.

Next, between the permanent magnets 15 and 16, 2
Individual Hall elements 21 and 22 are arranged, and the Hall elements 21 and 22 are provided back to back between the permanent magnets 15 and 16 in the stepped hole 5a of the shaft 5. The Hall elements 21 and 22 are made of a case 2 made of a non-magnetic conductive material.
Covered with 0, the printed circuit board 30 is mounted together with the case 20, the photo interrupter 90, and the circuit elements 23 and 24. The printed circuit board 30 is provided with four mounting holes 30a, and the mounting projecting portion 1a of the housing 1 is penetrated through the mounting hole 30a, and the mounting projecting portion 1a is caulked by heat, so that the printed circuit board 30 is mounted on the housing. It is fixed at 1. In addition, 29 is the Hall element 2
A collar made of resin for accommodating 1 and 22 is soldered and fixed to the printed board 30 by the collar 29. The collar 29 is the hall element 2
It is for positioning the printed circuit boards 30 of Nos. 1 and 22.

The Hall elements 21 and 22 are color 2
Since the Hall elements 21 and 22 are positioned on the printed circuit board 30 via the housing 9, the housing 1, the printed circuit board 30, and the collar 29 are at the same level by sensing the magnetic field orthogonal to the shaft 5 of the rotor 80. In order to obtain the detection signal, as described above, each Hall element 21, 22
Are disposed in the hollow portions of the permanent magnets 15 and 16 in parallel with the surface of the rotor 80 along the shaft 5 and symmetrically with respect to the shaft 5.

Further, a rubber packing 38 is provided in the opening 1b of the housing 1, and a cover 39 made of a magnetic material is further provided on the rubber packing 38 so that the peripheral edge of the opening 1b of the housing 1 is heat-crimped. Each part is fixed. Further, the upper surface of the printed circuit board 30 is filled or coated with a moistureproof material 40 such as a Humi-seal to protect the printed circuit board 30 and the like sealed by the rubber packing 38 from moisture. Also, as shown in FIG.
On the outside of the housing 1, a mating side mounting portion 1c in which a bush 41 is embedded is formed at a symmetrical position with respect to the shaft 5 of the rotor 80.

In the accelerator pedal operation amount detecting device of this embodiment having the above-mentioned structure, the accelerator pedal 20
By operating 0, the lever 7 is driven via the pedal rod 400, and this drive causes the rotor 80 to rotate. Then, with this rotation, the permanent magnets 15 and 16
However, since it rotates around the Hall elements 21 and 22, the magnetic field direction with respect to the magnetically sensitive surfaces of the Hall elements 21 and 22 changes.

As a result, the output VH from the Hall elements 21 and 22 changes as shown in the following equation: VH = VA.sin θ As shown in FIG. 6, the rotor 80 rotates from −40 ° to + 80 °. In the meantime, it continuously changes on the sine wave from -VA to + VA.

The range in which the detection signals are actually detected by the Hall elements 21 and 22 is −35 ° to +4.
5 ゜. Further, in the accelerator pedal operation amount detection device of the present embodiment, by operating the accelerator pedal 200, the lever 7 is driven via the pedal rod 400, and this drive causes the rotor 80 to rotate. Then, along with this rotation, the slit 10a of the rotating member 10 also rotates, and the slit 10a blocking the light from the light emitting element 90a of the photo interrupter 90 is released, and the light from the light emitting element 90a is transmitted to the light receiving element. To be done. The output of the photo interrupter 90 changes from the Hi signal to the Lo signal. This photo interrupter 90
Outputs a Hi signal when the accelerator pedal 200 is fully closed (that is, the vehicle is in an idle operation state). Further, the photo interrupter 90 switches from the Hi signal to the Lo signal at the position where the rotation angle of the rotor 80 is −30 °.

The photo interrupter 90 switches the Hi signal to the Lo signal at the Hall element 21,
Reference numeral 22 serves as a learning base point for updating the minimum value of the linear output obtained through the circuit elements 23 and 24. That is,
The accelerator pedal 200 is stepped on, and the accelerator pedal 200 returns to the fully closed position again. However, due to contact loss between the accelerator pedal 200 and the accelerator rod 400, between the accelerator rod 400 and the rotor 80, etc. If the hiss exceeds the predetermined range, the detection signals of the Hall elements 21 and 22 may be used as they are if the hiss is within a predetermined range even if the hiss occurs. Then, the detection signals of the Hall elements 21 and 22 are corrected.

Next, the sensor circuits for operating the Hall elements 21 and 22 which obtain such output characteristics to take out the detection signal are mounted on the printed circuit board 30 and the circuit pattern formed on the printed circuit board 30. Circuit element 2
3, 24, and a circuit 70 for taking out a signal from the photo interrupter 90, as shown in FIG.

As shown in FIG. 7, the sensor circuit 5 for the hall element 21 is provided on the printed circuit board 30 as a sensor circuit.
0 and the sensor circuit 60 for the Hall element 22 are formed independently of each other, and two terminals 24 among the five terminals 24 (only one terminal 24 can be seen in FIG. 1) are the sensor circuits. Of the remaining three terminals 24, two terminals 24c and 24d are used as detection signal output terminals from 50 and 60, and two terminals 24c and 24d are power supply terminals, that is, a terminal for power supply voltage (Vcc) supply and a ground (G).
In addition, one terminal 24e is used as an idle signal output terminal from the circuit 70 for taking out a signal from the photo interrupter 90.

Then, a power supply line from the terminals 24c and 24d which are terminals for power supply, that is, Vc
The c line and the Gnd line are divided into two before being connected to the circuit elements on the printed circuit board 30, and the sensor circuits 50 and 60 are individually supplied with power.
In FIG. 7, the capacitor C1 is a capacitor for removing noise on the power supply line.

Next, the sensor circuits 50 and 60 respectively
It is configured as follows. That is, first, the Hall element 2
The first sensor circuit 50 includes a temperature-sensitive resistor R1 having positive temperature characteristics and resistors R2 to R6.
Temperature compensating circuit 5 for generating reference voltage V11 for driving
1. Comprising an operational amplifier OP1 and a resistor R7, the Hall element 2 based on the reference voltage V11 from the temperature compensation circuit 51.
1, a driving circuit 52 for driving a constant current, an operational amplifier OP2,
It consists of OP3 and resistors R8 to R10, and the Hall element 2
1. A buffer circuit 53 that passes each output terminal voltage of 1, an operational amplifier OP4, a transistor TR1, and resistors R11 to R11.
R17 and each output terminal voltage that has passed through the buffer circuit 53 is composed of a differential amplifier circuit 54, an operational amplifier OP5 and resistors R18 and R19, and resistors R18 and R1.
A reference voltage generating circuit for increasing the amplified output potential of the differential amplifier circuit 54 by a reference voltage V12 obtained by dividing the power supply voltage Vcc by 9, and a capacitor C2 and resistors R20, R.
A filter circuit 56 configured to output the amplified output from the differential amplifier circuit 54 to the outside as a detection signal V1 (voltage across the load resistor RL1) representing the rotation angle of the rotor 80 (the operation amount of the accelerator pedal 200). It is configured.

Further, the sensor circuit 60 for the hall element 22
Is a temperature sensitive resistor R31 and resistors R32 to R36 having positive temperature characteristics, like the sensor circuit 50 for the hall element 21.
And a temperature compensation circuit 6 for generating a reference voltage V21.
1. A drive circuit 62 including an operational amplifier OP11 and a resistor R37 for driving the Hall element 22 with a constant current based on a reference voltage V21, operational amplifiers OP12 and OP13 and a resistor R.
A buffer circuit 63 including 38 to R40, an operational amplifier OP14, a transistor TR11, and resistors R41 to R4.
7 and a differential amplifier circuit 64, an operational amplifier OP15 and resistors R48 and R49 to generate a reference voltage V22 to increase the amplified output potential of the differential amplifier circuit 64, and a capacitor C12. And resistor R5
0 and R51, and the amplified output from the differential amplifier circuit 64 is a detection signal V2 (the voltage across the load resistor RL2) representing the rotation angle of the rotor 80 (the operation amount of the accelerator pedal 200)
Is constituted by a filter circuit 66 that outputs the signal to the outside.

As a result, the sensor circuits 50 and 60 output the detection signals V1 and V2 corresponding to the rotation angle of the rotor 80 as shown by the solid line in FIG. 8, and the detection signals V1 and V2 are output. From this, the rotation angle of the rotor 80 (the operation amount of the accelerator pedal 200) can be known. In addition,
The characteristics of the detection signals V1 and V2 shown by the solid lines in FIG. 8 are that the rotation angle of the rotor 80 is 0 degree (when the accelerator pedal 200 is fully closed,
That is, it is an output characteristic when the magnetic sensitive surfaces of the Hall elements 21 and 22 are offset by -35 degrees with respect to the magnetic field direction in the idle state), and can be described by the following equation.

V1, V2 = K.sin (.theta.-35) + VM That is, in the present embodiment, by having such a configuration,
Of the sine wave signals shown in FIG. 6 output by the Hall elements 21 and 22, signals in regions that change as linearly as possible can be output as the detection signals V1 and V2. In the above equation, K is the sensor circuit 50, 60.
Is a constant corresponding to the amplification characteristic of the reference voltage, and VM is an offset voltage (V12, V2
2).

Further, according to FIG. 8, with respect to the idle signal of the photo interrupter 90, when the rotation angle of the rotor 80 is 5 degrees, the Hi signal is switched to the Lo signal, and as described above, the Hall elements 21 and 22 are turned on. Circuit elements 23, 2
4 is used as a base point for learning for updating the minimum value of the linear output obtained. In the housing 1, two hall elements 21 and 22 and two sensor circuits 50 that respectively operate the hall elements 21 and 22 to output a detection signal,
60, a photo interrupter 90, and a circuit 70 that operates the photo interrupter 90 to output a predetermined signal, and incorporates two detection signals V1 and V2 corresponding to the rotation angle of the rotor 80 and a predetermined signal (Hi or Li). ) Is output. The detection signals V1 and V2 are substantially the same signal.

Therefore, according to the accelerator pedal operation amount detecting device of this embodiment, the permanent magnets 15 and 16 are connected to the rotor 80.
Is fixed to the shaft 5 of the rotor 80, and a magnetic path orthogonal to the shaft 5 of the rotor 80 is formed. Therefore, the magnetic field direction in the formed magnetic path is the shaft 5 of the rotor 80. Changes according to the rotation angle of. Therefore, the two Hall elements 21 and 22 in which the magnets 15 and 16 are formed generate the detection signals corresponding to the operation amount of the accelerator pedal 200 by detecting the magnetic field direction in this magnetic path. The photo interrupter 90 includes a light emitting element 90a that emits light and a light receiving element 90b that receives the light from the light emitting element 90a.
The idle signal Hi is output by blocking the light from the light emitting element 90a by the slit 10a that rotates together with the rotor 80. That is, the hall elements 21, 22
Uses the magnetic flux of the permanent magnets 15 and 16 to detect the rotation angle of the rotor 80, and the photo interrupter 90 uses light to output a predetermined signal. Since the predetermined signal obtained by the interrupter 90 does not significantly change, the detection signals of the Hall elements 21 and 22 and the predetermined signal of the photo interrupter 90 can be obtained as highly accurate outputs, and each hole By comparing the detection signals V1 and V2 obtained by the elements 21 and 22, the Hall element 2
1 and 22 failure detection can be performed easily and accurately,
Moreover, since the photo interrupter 90 is not affected by the magnetic flux of the permanent magnets 15 and 16, it is possible to bring the Hall elements 21 and 22 and the photo interrupter 90 close to each other.
The accelerator pedal operation amount detection device can be made compact.

This failure detection will be described in more detail. As a failure of the accelerator pedal operation amount detection device,
Mechanical failure due to a defect in the sensor structure and electrical failure due to disconnection, short circuit in the sensor circuits 50 and 60, failure of the Hall elements 21 and 22 and circuit elements 23 and 24, etc. For failures, the failure rate can be brought close to 0 by setting a high safety rate. However, it is impossible to reduce the failure rate to 0 because the failure of the electrical system is caused by defective parts such as Hall elements 21 and 22 and circuit elements 23 and 24 and defective soldering. Due to a defect or the like, the sensor circuits 21 and 22 may output a detection signal as indicated by a dotted line in FIG. 8 that is difficult to diagnose. However, in the accelerator pedal operation amount detection device of the present invention, two detection signals are detected. Since it is configured to output V1 and V2, it is possible to reliably detect the failure of the accelerator pedal operation amount detection device by comparing the detection signals V1 and V2.

The permanent magnets 15 and 16 are connected to the rotor 80.
Of the rotor 80, the Hall elements 21 and 22 are fixed to the stepped hole 5a provided at the tip of the shaft 5 of the rotor 80, and the hall elements 21 and 22 are fixed to the permanent magnets 15 and 16.
Since it is arranged between the two hall elements 21, 22,
The detection signals V1 and V2 obtained from the above are substantially the same signals, and the failure of the hall elements 21 and 22 can be detected extremely easily only by comparing the substantially same signals.

Since the slit 10a is formed in the rotor 80 and has an arc shape centering on the shaft 5 of the rotor 80, a predetermined signal of the photo interrupter 90 can be accurately obtained according to the rotation of the shaft 5 of the rotor 80. Therefore, the detection accuracy can be significantly improved. Also,
By rotating the shaft 5 of the rotor 80, the detection signals V1 and V2 obtained from the two Hall elements 21 and 22 and the predetermined signal obtained from the photo interrupter 90 are obtained, so that the two Hall elements 21 and 22 are obtained. Detection signal V
1, V2 and the predetermined signals of the Hall elements 21, 22 follow accurately.

Further, by accommodating the rotor 80, the permanent magnets 15 and 16, the Hall elements 21 and 22, the photo interrupter 90, and the slit 10a in the housing 1 of the accelerator pedal operation amount detecting device, the conventional accelerator pedal is obtained. Compared to a case where the manipulated variable detection device and the switch are separate, the number of parts can be significantly reduced, and the size can be further reduced.

Further, only one surface of the printed board 30 is
Each Hall element 21, 22 and photo interrupter 90
Sensor circuits 50 and 60 for processing the detection signals V1 and V2 obtained by
2. Since the photo interrupter 90 is arranged, it is only necessary to assemble the respective members from one direction, which facilitates the assembling work. To put it a little more, printed circuit board 3
Since the Hall elements 21 and 22 and the photo interrupter 90 are arranged on one surface of the rotor 0, the permanent magnets 15 and 16 and the slit 1 are formed on the rotor 80 facing the printed circuit board 30.
0a can be arranged side by side, and they can be integrated, and each Hall element 21, 22 and photo interrupter 90
By mounting each signal processing circuit on the soldering surface, the soldering work can be performed only on one surface, so that the assembling work becomes extremely easy.

In the present embodiment, the photo interrupter 90 is used to output the idle signal, but the present invention is not limited to this, and a capacitance type switch or the like may be used. The photo interrupter 90 of the present embodiment is used as a learning base point for updating the minimum value of the linear output. In addition to the learning control contents, the accelerator pedal 200 is in the fully closed position (0 ° to 5 ° in FIG. 8). Region), when the output of the photo interrupter 90 is Hi, the linear outputs V1 and V2 of the Hall elements 21 and 22 shown in FIG.
Learning control for updating the fully-closed output voltage may be performed.

[Brief description of drawings]

FIG. 1 is a sectional view showing an internal configuration of an accelerator pedal operation amount detection device of the present invention.

FIG. 2 is a top view showing the periphery of a printed circuit board with a part of a cover 39 seen from the direction A in FIG.

FIG. 3 is a schematic diagram showing a system including an accelerator pedal operation amount detection device of the present invention.

FIG. 4 is a partial top view showing the vicinity of a hall element, excluding a cover 39 and the like as viewed from the direction A in FIG.

5 is an exploded view of the accelerator pedal operation amount detection device of FIG. 1. FIG.

6 is a diagram showing the output signal characteristics of the Hall elements 21 and 22 and the output signal characteristics of the photo interrupter 90. FIG.

FIG. 7 is an electric circuit diagram showing configurations of sensor circuits 50, 60 and a circuit 70.

8 is a diagram showing a detection signal characteristic obtained by the sensor output circuit of FIG. 6 and a signal output characteristic obtained by the circuit 70. FIG.

FIG. 9 is a schematic diagram showing a system including a conventional accelerator pedal operation amount detection device.

[Explanation of symbols]

 5 Shaft (Rotation axis) 10a Slit (Rotation position signal output means) 15, 16 Permanent magnets 21 and 22 Magnetoelectric conversion element (Hall element) 80 Rotor 90 Photo interrupter (Rotation position signal output means)

Claims (7)

[Claims] 1. A rotor that rotates according to the movement of an object, a pair of magnets that are fixed to the rotor and that face each other, and a rotor that is provided in a magnetic path formed by these magnets. A magnetoelectric conversion element for detecting a magnetic field direction in a magnetic path; and a rotational position signal output means for detecting a rotational position of the rotor and outputting a predetermined signal without using a magnetic flux of the magnet. A position detecting device characterized by the above. 2. The position detecting device according to claim 1, wherein the rotational position signal output means includes a light emitting element for generating light, a light receiving element for receiving light from the light emitting element, the light emitting element and the light receiving element. It is provided between the element and
A position detecting device comprising a shield plate fixed to the rotor, and outputting a rotational position signal of the rotor by blocking the light from the light emitting element by the shield plate. 3. The position detecting device according to claim 1, wherein the magnets are arranged so as to face each other with the rotation shaft of the rotor interposed therebetween, and are fixed in a recess provided at the tip of the rotation shaft of the rotor. A pair of arc-shaped magnets, wherein the magnetoelectric conversion element is two magnetoelectric conversion elements arranged between the pair of arc-shaped magnets. 4. The position detecting device according to claim 2, wherein the shielding plate is formed in an arc shape around a rotation axis of the rotor and is provided on the rotor. 5. The position detection device according to claim 1, further comprising a housing that houses the rotor, the magnet, the magnetoelectric conversion element, and the rotational position signal output means. 6. The position detection device according to claim 3, wherein a signal processing circuit that processes the detection signals obtained by the two magnetoelectric conversion elements and the rotational position signal output means and outputs the signals to the outside is provided on the printed circuit board. A position detecting device provided, wherein each of the magnetoelectric conversion elements and the rotational position signal output means are arranged on one surface of the printed board. 7. The position detecting device according to claim 1, wherein the object is an accelerator pedal, and the object is an accelerator pedal operation amount detecting device.