JPS62163120A - Method for detecting original point position of rotating body - Google Patents

Abstract

PURPOSE:To recognize accurately a straight drive steering state even through the steering position of a steering handle is shifted by the play degree of the handle, by setting an original point position with a wider range of angles than the play degree.f the prescribed rotational angle of a rotating body which is revolved in response to an external operation at the position of said prescribed rotational angle. CONSTITUTION:The position where a slip part 1c is turned opposite to a photointerrupter 4 is defined as the original point position of a rotary disk 1 and set in response to the handle steering position when a car is traveling straight. In other words, the position where the center of the angle width alpha of a slip part 1b is turned opposite to the photointerrupter 4 is defined as the center of the original point position of the disk 1 and this center position is set in response to the center of the handle steering position when the car is traveling straight. Here the angle width alpha of the part 1b is set larger than the play angle of the steering handle. As a result, the original point position detecting signals are produced with no interruption at the straight drive steering position of the car even though the disk 1 is oscillated by the play of the handle in a straight traveling mode.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is suitable for use in detecting the origin position of a rotating body that rotates in conjunction with the steering of a steering wheel of a vehicle, etc. The present invention relates to a method for detecting the origin position of a body.

[Conventional technology]

Conventionally, in vehicles such as automobiles, a plurality of slits are opened at equal angular intervals in a rotary disk that rotates in conjunction with steering wheel steering, and two photointerrupters are placed adjacently at the positions where the slits pass. This system performs various controls linked to the steering wheel.

In other words, the first and second
The photointerrupter generates pulsed electrical signals having the same waveform but with a phase shift of approximately 90 degrees, and the electrical signals are counted to detect the rotational direction and rotational position of the handle.

Generally, in a rotational position detector configured in this manner, a slit for detecting the origin position is provided at a predetermined rotational angle position of the rotating disk, and passage through and stopping at the slit for detecting the origin position is controlled by a third photointerrupter. It is detected using That is, an origin position detection signal is generated in the third photo-interrupter in correspondence with the straight-ahead steering position of the automobile, and a counter that counts the electrical signals sent by the first and second photo-interrupters is corrected. .

[Problem that the invention seeks to solve]

However, with such conventional rotational position detectors, the width of the slit for detecting the home position is narrow, so there is a risk that the home position detection signal will not be generated even when the vehicle is traveling straight. there were. That is, the steering wheel of an automobile has a predetermined amount of rotation angle play, and since the angular width of the origin position detection slit is narrower than this amount of play, the origin position detection signal may not be generated when the vehicle is traveling straight.

[Means to Solve the Problems J] The present invention has been made in view of the above problems. The origin position is provided at a predetermined rotational angle position of a rotating body that rotates in unison with a wider angular range than the idle violet.

[For production]

Therefore, according to the present invention, the origin position can be detected in a wider range than the play of external operation.

[Example] Hereinafter, a method for detecting the origin position of a rotating body according to the present invention will be described in detail. FIG. 1 is a schematic diagram showing an embodiment of a rotational position detector to which this origin position detection method is applied. In the figure, reference numeral 1 indicates a rotating disk that rotates in conjunction with steering of a steering wheel of an automobile, and reference numerals 2 to 4 indicate photointerrupters each having a light emitting element and a light receiving element. A plurality of rotation angle detection slits 1a having the same rectangular shape and having equal angular widths are provided on the outer circumferential edge surface of the rotating disk 1. Three adjacent pieces are connected by an arc-shaped slit portion 1b to form an origin position detection sling 1c.

Photointerrupters 2 and 3 are arranged adjacent to each other at the passage position of the rotation angle detection slit 1a, and the photointerrupters 2 and 3 have the same waveform but a phase shift of about 90 degrees as the rotating disk 1 rotates. A pulsed electrical signal is generated. Further, a photo interrupter 4 is disposed at a position where the arc-shaped slit portion 1c of the origin position detection sulin 1c passes, and this photo interrupter 4 is used to adjust the slit portion 1c as the rotating disk 1 rotates. It is designed to detect passing and stopping. That is, while the photointerrupter 4 is detecting the slit portion 1c, the origin position detection signal is generated. - In the rotational position detector configured as described above, the position where the slit portion 1c rotates and faces the photointerrupter 4 is set as the origin position of the rotating disk 1, and this origin position is the steering wheel steering position when traveling straight. It is set in association with. That is, the position where the center of the angular width α of the slit portion 1b is rotationally opposed to the 7-way interrupter 4 is set as the center of the origin position of this rotating disk 1 (the state shown in the same figure), and the center of this origin position is set as the center of the origin position of the rotating disk 1. The setting corresponds to the center of the steering wheel position at the time. The angular width α of the frit portion 1b is set to be wider than the play angle of the handle.

Therefore, even if the rotary disk 1 swings due to play in the steering wheel while driving straight, the photo interrupter 4 always faces the slit portion 1b, and the origin position detection signal will not be interrupted at the straight steering position of the vehicle. Occurs continuously.

FIG. 2 is a block diagram showing one embodiment of a steering wheel steering interlocking system using the rotational position detector configured as described above. The configuration and operation of this steering wheel steering interlocking system will be explained below, and the features of this rotational position detector will be explained from a European perspective.

That is, in FIG. 2, reference numeral 5 indicates an UP/DOWN circuit which inputs the pulsed electrical signals sent out by the photointerrupters 2 and 3 of the rotational position detector and sends out processed signals (up signal and down signal) according to the steering wheel steering. Switching circuit, 6 (7) UP/DOWN counter which inputs the processed signal sent out by the UP/DOWN switching circuit 5, 7 has an output terminal (not shown) at a position corresponding to the count value of this counter 6. This is a decoder that selects the level rLJ6 or "H" to control external equipment such as a cornering lamp system that operates in conjunction with steering wheel steering.

The UP/DOWN switching circuit 5 processes the input pulsed electrical signal and turns the steering wheel clockwise (hereinafter referred to as rightward).
The number of up signals and down signals corresponding to the amount of steering to the U
The P/DOWN counter 6 counts up or down its count value by the number of input up signals or down signals. That is, the center of the origin position where the rotating disc 1 is located when traveling straight is the center of the rotation center of this rotating disc, and the UP/ The count value in the DOWN counter 6 is set to zero, and by steering the steering wheel to the right, the count value increases sequentially, and by steering the steering wheel to the left, the count value sequentially decreases. The UP10OWN output counter 6 sends the count value to the decoder 7 and comparators 8-10.

Each of the comparators 8 to 10 is set with a comparison reference value corresponding to a count value corresponding to a predetermined steering position of the steering wheel, and this comparison reference value and the UP/DOWN counter 6 are set.
The count values inputted through the two are compared, and the output level thereof is set as the rHJ level. That is,
Comparator 8 indicates the straight steering position of the steering wheel (hereinafter referred to as
180 based on the center of the steering wheel (referred to as the handle center)
Count value N0 corresponding to the steering position in the right direction (+ direction)
is set as the +1 rotation reference value, and the comparator 10 contains 180 rotations based on the center of the handle center.
Count value N corresponding to the steering position in the left direction (one direction)
2 is set as the 11th rotation reference value. The comparator 9 is set with N1 and N2 as center reference values, and the comparator 9 is set when the count value input via the UP/DOWN counter 6 is greater than or equal to N2 and less than N1, that is, the input count value. When N is N, if N2<N<N, the level of the output terminal 9a is set to the "■(" level. Also, the comparator 8 is configured so that the input count value N is N When ≧N0, the level of the output terminal 8a is set to “H” level, and the comparator 10 inputs the count value N when N≦N,
When A, the level of the output terminal 1Oa is set to [j level. The "H" level output signals sent out from the comparators 8 to 10 are input to one end of the AND gates 11 to 13, and the other ends of the AND gates 11 to 13 are connected to the AND gate 14. The output of is now input.

Incidentally, the origin position detection signal sent from the photo-interrupter 4 of the rotational position detector shown in FIG. 1 is generated every time the steering wheel rotates to the right or left about the center of the steering wheel. Generally, the steering wheel of an automobile can be rotated less than two times in the right and left directions around the center of the steering wheel, so the photo interrupter 4 detects a total of three origin positions including the rotation center. , sends out the origin position detection signal. That is, when this origin position detection signal is sent out, an "H" level origin detection signal is input to one of the input terminals of the AND gate 14 in FIG. 2, and when this origin detection signal is input, A clock signal sent from the reference clock generator 15 passes through an AND gate 14 and is input to AND gates 11-13.

The clock signals passing through the AND gates 11 to 13 are input to counters 16 to 18, and the count value of each counter is equal to the rising edge of the one-shot signal sent by the astable multivibrator 19. The count value is taken into the latch circuits 20 to 22 at the edge, and the count value taken into the latch circuits 20 to 22 is sent to the comparator 2.
It is designed to be input to predetermined input terminals 3 to 25. That is, if the count values taken into the latch circuits 20, 21 and 22 are α, β, and γ, respectively,
The count value α sent out by the latch circuit 20 is input into the non-inverting input terminals of the comparators 23 and 25, and the count value β sent out by the latch circuit 21 is input into the inverting input terminal of the comparator 23 and the non-inverting input terminal of the comparator 24. The count value γ sent out by the latch circuit 22 is
is input to the inverting input terminals of comparators 24 and 25. And comparators 23 to 25
The outputs of the decoder 26 are inputted to the input terminals 26a to 26e of the decoder 26, and the decoder 26
A predetermined terminal among the output terminals 26d to 26i is selected based on the combination of signals inputted to a to 26c, and the output level of that terminal is set to the "H" level. Table 1 shows the truth table of the decoder 26.

In Table 1, according to the magnitude relationship of the count values α, β, and γ taken into the latch circuits 20, 21 and 22,
The selected positions of the output terminals at the "H" level are determined as shown in Table 1, and the output terminals 26d to 2
The signal sent from 6i is input to one end of Nantes gates 27-32. The output of the AND gate 13 is branched and inputted to the other ends of the Nant gates 27 and 28.
The output of the AND gate 12 is branched to the other ends of Nand gates 9 and 32 and input thereto, and the output of the AND gate 11 is branched and input to the other ends of the Nant gates 30 and 31. Then, the outputs of the NAND game) 27 to 32 are input to the monostable multivibrator 33, and the monostable multivibrator 33 operates at the edge of the falling edge of the input signal, and the UP/DOWN output is input to the monostable multivibrator 33. A reset signal is sent to return the count value at this counter to zero. Furthermore, the reset signal sent out by the multivibrator 33 is branched and input to the latch circuits 20 to 22.
The latch data in the latch circuits 20 to 22 is reset.

The monostable multivibrator 34 is activated at the falling edge of the one-shot signal sent by the monostable multivibrator 19, and the one-shot signal sent from the multivibrator 34 is activated by the falling edge of the one-shot signal sent out by the monostable multivibrator 19.
This is a reset signal that returns the count value at 8 to zero. Furthermore, the monostable multivibrator 19 operates at the 9th edge of the falling edge of the outgoing timer signal sent out by the timer circuit 35 and continues for a predetermined period of time to reach the II (j level), and sends out one shot to the latch circuits 20 to 22. The signal is repeatedly sent out at predetermined time intervals.

Next, the operation of the device configured in this way will be explained. That is, it is assumed that the automobile is now traveling straight ahead, and that the rotating disk 1, which rotates in conjunction with the steering wheel, is located at the center of the rotation center as shown in FIG. At this time, U.P.
The count value at /DOWN Kawanta 6 should actually be zero, but the count value may deviate from zero due to electrical noise as mentioned above or rotation of the steering wheel after turning on the ignition switch. You can get it if you have it. When such a deviated count value is input to the decoder 7, a problem arises in that an external device controlled using the decoder 7 performs a deviated operation in accordance with the count value. However, in this embodiment, since the correction operation as described below is quickly performed, it becomes possible to control external equipment in conjunction with the -handle steering without any trouble.

That is, the count value in the UP/DOWN counter 6 is input to the decoder 7 and simultaneously input to the comparator 8.
-10 are also input, and are compared with each reference value in comparators 8-10. Tsumashi, UP
/DOWN Count value N in Kawanta 6 is N≧N1
When , the comparator 8 sends out all rHJ level signals from its output terminal 8a, and when N≦N2, the comparator 10 sends out an "H" level signal from its output terminal 10a. Also, when N2<N<N, the comparator 9 sends out an "H" level signal from its output terminal 9a, and depending on the output state of the comparators 8 to 10, one of the AND gates 11 to 13 is set. becomes. On the other hand, the AND gate 14 passes the clock signal sent from the reference clock generator 15 and sends it to the other ends of the AND gates 11 to 13 during the generation period of the input origin detection signal. The clock signal sent to the other end of the AND gates 11 to 13 passes through an AND gate (one of 11 to 13) that is already set according to the count value in the counter 6, and is sent to the subsequent counter. It will be done. In other words, the origin detection signal input to the AND gate 14 is generated at the rotation center position of the rotating disk and at the position of one rotation in the left and right direction around this rotation center position, and the origin detection signal is generated at the rotation center position of the rotating disk and one rotation position in the left and right direction around this rotation center position. If the steering angle is less than ±180, the output of the comparator 9 becomes "H" based on the count value of the counter 6 when the origin detection signal is generated at the center position of one revolution. Furthermore, when the origin detection signal is generated at one rotation position in the right direction, the output of the comparator 8 is rHJ based on the count value of the counter 6, and when it is generated at one rotation position in the left direction, the output of the comparator 10 is rI ( Therefore, while the origin detection signal is generated at the rotation center position, the counter 17 counts the clock signal of the reference clock generator 15, and the origin detection signal is generated at the rightward one rotation position. The counter 16 counts the clock signals while the counter 16 is running.
While the origin detection signal is being generated at the rotational position, the counter 18 counts the clock signal. The knob υ and each of the counters 16 to 18 replace the time during which the origin detection signal is generated at each rotational position, that is, the origin position residence time at three locations on the rotating disk 1, with the count value of the clock signal and integrate it. do. The count values of each counter 16 to 18 are calculated by the timer circuit 3.
The falling edge of the transmitting timer signal sent by 5 is captured by the 1-shot signal of the monostable multivibrator 19 operating at 9 edges into the shratch circuits 20-22.

On the other hand, the counter 16 after the count value is taken in
~18 is 1 sent out by the monostable multivibrator 19
The monostable multivibrator 34, which operates at the falling edge of the shot signal, is reset by the one-shot signal,
The count value returns to zero and prepares for counting the next input clock signal. That is, the counters 16 to 18 count the clock signals input within a predetermined time determined by the period of the outgoing timer signal sent out by the timer circuit 35, and the latch circuits 20 to 22 count the clock signals input within this predetermined time. The count value will now be input.

Therefore, the count values (α, β and γ) taken into the launch circuits 20, 21 and 22 are transferred to the comparator 23.
~25. In general, it is no exaggeration to say that most of the time when a car is running is in a straight line, and for this reason, the cumulative time for the origin detection signal to be generated at the rotation center position of the rotating disk is It is longer than the rotation position and the leftward one rotation position. Furthermore, in this embodiment, since the angular width α of the origin position detection ring 1c of the rotating disk 1 is set to be wider than the play angle of the steering wheel, the steering wheel is Even if the rotation is within the play angle range, the origin detection signal will continue to be generated, and the cumulative time for the origin detection signal to be generated at the rotation center position of the rotating disk is the same as the one rotation position in the right and left directions. It will definitely be longer. Therefore, if the deviation of the count value in the counter 6 is less than 180 degrees in terms of the steering angle of the steering wheel and in normal driving conditions, the count value β taken into the latch circuit 21 will inevitably be the maximum. In other words, the decoder 26
Count values α, β and γ at 0.21 and 22
Depending on the magnitude relationship, an "H" level signal is sent from the output terminal 26f or 26i. In such a state, when the AND gate 12 passes the clock signal sent by the reference clock generator 15, the other input terminals of the Nandt gates 29 and 32 become "H" level, and the clock signal is input to the monostable multivibrator 33. The input signal falls, a reset signal is input to the UP/DOWN counter 6, and its count value becomes zero.

In other words, the U P/D OWN counter 6 is reset at the time when the clock signal is input to the counter 17 that performs the maximum count within a predetermined period of time via the AND gate 12. Since the UP/DOWN counter 6 is reset when the rotary disk 1 is located at the center position, the UP10OWN counter 6 can be appropriately corrected.

The reset signal sent by the monostable multivibrator 33 is also input to the latch circuits 20 to 22 to reset the latch operations in these latch circuits and prepare for the next data acquisition operation.

The above explanation was based on the assumption that the deviation of the count value in UP/DOWN Kakunta 6 is less than +180 in terms of steering angle, but even if it is more than +180, the count value in UP/DOWN Kakunta 6 cannot be corrected. is carried out without any problems.

For example, now, in tJP/DOWN Kawanta 6, the deviation of 1 Kawant value is +180 or more in terms of Nordru steering angle,
For example, let's say you rarely get +360". At this time, UP/D
The count value N sent by the OWN counter 6 is N0 at the rotation center position of the rotating disk and the one rotation position in the right direction.
As above, if the position is one rotation in the left direction, N, <N<N
, becomes. Therefore, the rotation center position and the right direction 1
At the rotational position, when the output of the comparator 8 is at the "H" level, the clock signal passing through the AND gate 11 is integrated and counted by the counter 16. Also,
At one rotation position in the left direction, the output of the comparator 9 becomes rl (J level 9, and the clock signal passing through the AND gate 12 is integrated and counted by the counter 17. While the car is running, as described above, Since most of the time is straight travel, the time for the origin detection signal to be generated is the longest at the rotation center position.Tsumashi and Kawanta 16 count including the generation time for the origin detection signal at the rightward one rotation position. However, the one rotation position component in the right direction included in the count value is extremely small, and there is no problem in determining the point in time when the clock signal is input to the counter 16 via the AND gate 11 as the point in time when the latch is running straight. By comparing the count values α, β, and γ taken into the circuits 20, 21, and 22 using the comparators 23 to 25, it is determined that α is the maximum, and the output terminals 26g and 26h of the decoder 26
A signal at rHJ level is sent out. Then, at the time when the clock signal is sent out through the AND gate 11, that is, when the rotating disk 1 is positioned at the rotation center position among the three origin positions, the other input terminal of the Nand gates 30 and 31 is turned on. rHJ level, UP/DOWN force Kunta 6
is relit, and its count value is appropriately corrected.

Similarly, when the deviation of the count value in the UP/DOWN counter 6 is -180 or more in terms of the steering angle of the steering wheel, the count value γ in the latch circuit 22 becomes maximum, and the rotating disk moves to the center of rotation. When the position is reached, the count value of the UP/DOWN counter 6 is appropriately corrected.

As explained above, in this embodiment, the rotating disk 1
Since the angular width of the slit 1c for detecting the origin position is made wider than the play angle of the steering wheel, even if the steering wheel is not located exactly at the center of its steering position while driving straight, that is, within the range of the play angle. Even if the motor rotates at 100 degrees, the origin detection signal is reliably input to the AND gate 14, and the UP/DOWN counter 6 can be accurately corrected based on this origin detection signal.

In this embodiment, a slit 1e for detecting the origin position of the rotating disk IK is provided, but a mirror surface having the same shape as this slit is used to reflect the light from the light emitting element and receive it at the light receiving element. It may also be configured. Further, the slit 1C for detecting the origin position is the same as that of this embodiment. The handle is not limited to this shape, but may have any shape as long as the play angle of the handle is a wide slit. Further, although the origin position is detected using a photointerrupter such as a light emitting element and a light receiving element, a magnetic sensor using a Hall element or the like may also be used.

〔Effect of the invention〕

As explained above, according to the method for detecting the origin position of a rotating body according to the present invention, since the origin position is provided at a predetermined rotational angle position of the rotating body that rotates in conjunction with an external operation, the origin position has a wider angular range than the amount of play. The origin position can be detected over a wider range than the play caused by external operation. For example, when this rotating body is rotated in conjunction with the steering wheel of a car, etc., it is possible to detect the position of the origin even if the steering position of the steering wheel deviates due to the amount of play. too,
It becomes possible to accurately recognize the straight-ahead steering state.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a rotational position detector to which the method for detecting the origin position of a rotating body according to the present invention is applied;
The figure is a block diagram showing one embodiment of a steering wheel steering interlocking system using this rotational position detector. 1... Rotating disk, 2-4... Photo interrupter, 1a... Rotation angle detection slit, 1b.
...Circular slit section, 1c ...Slit for detecting the origin position. Figure 1

Claims (1)

[Claims] A rotating body that rotates in conjunction with an external operation with a play of a predetermined rotational angle is provided, and an origin position having a wider angular range than the amount of play is provided at a predetermined rotational angle position of the rotating body, and the passage of the origin position and A method for detecting an origin position of a rotating body, characterized by detecting a stationary state.