JPS62157510A - Method of judging center position of rotary body - Google Patents

Abstract

PURPOSE:To prevent the erroneous counting of the counter of the rotary position detector of a rotary body cooperated with the steering wheel of a car, by judg ing an origin position where the integrated value within the predetermined time of a stop time becomes max as center position of a rotary body. CONSTITUTION:Signals corresponding to a direction of rotation due to two sets of photointerruptors outputting signals different by 90 deg. from light passing through the slits provided on the rotary body cooperated with a steering wheel at an equal interval are counted by the counter 5 changed over by an increment/ decrement change-over circuit 5. This count value is compared with respective + or -one-rotation reference values N1, N2 by comparators 8, 10, 9 to control the opening of AND gates 11, 13, 12. The reference clock through an AND gate 14 opened by an origin position detection signal due to the origin position slit of the rotary body is counted for a predetermined time due to a monostable multivibrator 34 by counters 16-18 through the gates 11-13. An origin position where the integrated value becomes max is judged as the center position of the rotary body by comparators 23-25 and a decoder 26 and the counter 6 is reset by the judge output to correct erroneous counting.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rotating body suitable for use in determining the rotation center position of a rotating body that rotates in conjunction with steering wheel steering of a vehicle, etc. when the body is running straight ahead. The present invention relates to a center position determination method.

[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 adjacent to each other at the passing positions of these slits. In other words, in conjunction with steering wheel steering, the first and second photointerrupters are provided with a pulse-like signal having the same waveform but approximately 90 degrees out of phase. An electrical signal is generated and the electrical signal is counted to detect the rotational direction and rotational position of the nozzle.

[Problem that the invention seeks to solve]

However, according to such conventional rotational position detectors, when the counter miscounts due to electrical noise, etc., the means to correct the error is There was a problem that the system would malfunction when Changes in the rotational position of the handle up to this point result in errors that are accumulated.

[Failure to solve the problem]

The present invention has been made in view of these problems, and the origin position is a predetermined rotational angle position of a rotary body that rotates clockwise and counterclockwise in conjunction with external operation, and each rotation of this rotary body is The origin position residence times of the rotating body are integrated within a predetermined time, and the origin position where the integrated value is the maximum is determined as the center position of the rotation of the rotating body in the clockwise and counterclockwise directions.

[Effect]

Therefore, according to the present invention, among the origin positions located every other revolution of the rotating body, the origin position with the maximum accumulated value of residence time can be determined as the rotation center position of the rotating body.

[Example] Hereinafter, a method for determining the center position of a rotating body according to the present invention will be described in detail. FIG. 1 is a block diagram showing an embodiment of this center position determination method.

In the figure, reference numeral 5 denotes an UP/DOWN switching circuit which receives a pulsed electric signal sent from the rotational position detection sensor (Fig. 2) and sends out processed signals (up signal and down signal) according to steering wheel steering; 6 is an UP/r)O which inputs the processed signal sent out from this UP/DOWN switching circuit 5.
WN counter 〇The rotational position detection sensor shown in Fig. 2 includes a rotating disk 1 that rotates in conjunction with the steering wheel,
The photointerrupter 2 is composed of photointerrupters 2 to 4 each having a light emitting element and a light receiving element.
and 3 are disposed adjacent to the passage positions of slits 1a of the same shape opened at equal angular intervals on the outer peripheral edge surface of the rotating disk 1. Then, as the rotating disk 1 rotates and passes through the slit 1a, the photointerrupters 2 and 3 generate pulsed electrical signals with the same waveform but with a phase shift of approximately 90 degrees. , this pulsed electrical signal is input to the UP/D OWN switching circuit 5. In addition, at a predetermined rotational angle position on the outer peripheral edge surface of the rotating disk 1, a slit 1 for detecting the origin position is installed independently.
A photointerrupter 4 detects passage through the slit 1b. In other words, the rotational position where the rotating disc 1b faces the photointerrupter 4 is the origin position of the rotating disk 1, and this origin position is the steering wheel steering position when traveling straight (hereinafter, this steering position will be referred to as the steering wheel center). It is set in association with. In other words, at the handle center, the rotating disc 1 is located at the origin position as shown in the same figure (hereinafter, this position is referred to as the rotation center of the rotating disc), and the handle is centered at the handle center. The origin position of the rotary disk 1 is detected to be shifted by 360° for each rotation in the clockwise and counterclockwise directions. In general, the steering wheel of an automobile can be rotated less than two turns each clockwise (hereinafter referred to as rightward direction) and counterclockwise (hereinafter referred to as leftward direction) around the center of the steering wheel. Therefore, the 7-way interrupter 4 has to detect a total of three origin positions including the rotation center, and when detecting this origin position, one of the input terminals of the AND gate 14 in FIG.
A level origin position detection signal is input.

On the other hand, the UP/DOWN switching circuit 5 processes the input pulsed electrical signals and outputs up signals and down signals according to the right and left steering amounts of the steering wheel through its output terminals 5a and 5b. 9
, UP/DOWN counter 6 is configured to up-count or down-count its count value by the number of input up signals or down signals. That is, the count value in the U P/D OWN counter 6 is set to zero when the rotating disk is at the rotation center position, and as the steering wheel is turned to the right, the count value increases sequentially. The count value decreases sequentially by left steering. And UP/
DOWN counter 6 sends its count value to decoder 7 and comparators 8 to 10, and decoder T selects an output terminal (not shown) at a position corresponding to the input count value, The level is set to [LJ or rHJ] to control external equipment such as a cornering lamp system that operates in conjunction with steering wheel steering.

On the other hand, the comparators 8 to 10 are each set with a comparison reference value corresponding to a count value corresponding to a predetermined steering position of the steering wheel, and the comparison reference value and the input value are inputted via the U P/D OWN counter 6. The output level is set as the rHJ level.

That is, the comparator 8 is set with a count value N1 corresponding to a steering position of 180 degrees to the right (+ direction) centering on the steering wheel center as a +1 rotation reference value, and the comparator 10 is set with a count value N1 corresponding to a steering position of 180 degrees to the right (+ direction) centering on the steering wheel center. A count value N2 corresponding to a steering position 180° leftward (one direction) from the center is set as the 11th rotation reference value. Then, the comparator 9 is set with the above Nl and N2 as center reference values, and the comparator 9 is set as the center reference value.
When the count value inputted via the D OWN counter 6 is greater than or equal to N2 and less than or equal to Nl, that is, when the inputted count value is N, if N2<N<Nl, the level of the output terminal 9a is changed. The level is set to "H". In addition, the comparator 8 has an input count value N of
N≧N When N0, the level of the output terminal 8a is set to "H" level, and the comparator 10 receives the input count value N.
However, when N≦N2, the level of the output terminal 10a is set to “H”.
' level.

The "H" level output signals sent from the comparators 8 to 10 are input to one end of the AND gates 11 to 13, and the output signals of the AND gates 11 to 13 are input to the The output of the gate 14 is input. An origin position detection signal is input to one input end of the AND gate 14 via the above-mentioned circuit and the photo ink converter 4 shown in FIG.
A clock signal sent from the reference clock generator 15 is input to the other end.

The outputs of AND gates 11 to 13 are output to counters 16 to 18.
The count value in each counter is input to the latch circuit 20 to 9 at the rising edge of the 1-shot signal sent by the astable multivibrator 19.
22. The count values taken into the latch circuits 20-22 are inputted to predetermined input terminals of the comparators 23-25. That is, if the count values taken into the latch circuits 20, 21 and 22 are α, β and γ, respectively, then the count value α sent out by the latch circuit 20 is input to the non-inverting input terminals of the comparators 23 and 25,
The count value β sent out by the latch circuit 22 is input to the inverting input terminal of the comparator 23 and the non-inverting input terminal of the comparator 24, and the count value γ sent out by the latch circuit 22 is input to the inverting input terminal of the comparators 24 and 25. It is entered at the end. And comparator 23
The outputs of ~25 are input terminals 26a~26e of the decoder 26.
The decoder 26 selects a predetermined terminal from among the output terminals 26d to 26i based on the combination of signals input to the input terminals 260 to 26c, and adjusts the output level of that terminal. is designated as rHJ level. Table 1 shows the truth table of the decoder 26. In other words, the "H" level and The selection positions of the output terminals 9 and 26d are determined as shown in Table 1.
The signals sent from ~261 are Nantes gates 27~32.
It is designed to be entered at one end of the . The output of the AND gate 13 is branched and inputted to the other ends of the Nante gates 27 and 28, and the output of the AND gate 12 is branched and inputted to the other ends of the Nante gates 29 and 32. , the output of the AND gate 11 is branched and inputted to the other ends of the Nant gates 30 and 31. Then, the outputs of the Nant gates 21 to 32 are input to the monostable multivibrator 33, and the monostable multivibrator 33 operates at the rising edge of the input signal. A reset signal is sent to return the count value of the counter to zero. Further, the reset signal sent out by the multivibrator 33 is branched and inputted to the latch circuits 20-22, and the latch data in the latch circuits 20-22 is reset.

Furthermore, the monostable multipipe rake 34 is activated when the one-shot signal sent out by the monostable multivibrator 19 falls at the 9th edge, and the one-shot signal sent out by the multivibrator 34 is outputted from the counter 16 to 1
This is a reset signal that returns the count value at 8 to zero. Furthermore, the monostable multi-pipe rake 19 is activated at the 9th edge of the rising time of the outgoing timer signal which is sent out by the timer circuit 35 and continues to be at the rH level for a predetermined period of time, and sends out one shot to the latch circuits 20 to 22. The signal is repeatedly sent out at predetermined time intervals.

Next, we will explain the operation of the device configured as described above.In other words, when the car is traveling straight ahead, the rotating disc 1, which rotates in conjunction with the steering wheel, is rotated as shown in Fig. 2. It is assumed that the motor is at the rotation center position. At this time, UP/
The count value in the DOWN counter 6 should actually be zero, but the count may deviate from zero due to electrical noise as mentioned above or rotation of the steering wheel after turning on the ignition switch. It may be possible if the value is the same. 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 the external device in conjunction with the steering wheel steering without any trouble.

That is, the count value in the UP/DPWN counter 6 is input to the decoder T, and at the same time it is input to the comparator 8.
-10 are also input and compared with each reference value in comparators 8-10. Tsumashi, UP
/DOWN counter 6 count value N is N≧Nl
When , comparator 8 outputs its output terminals 8 & 9.
When N≦N2, the comparator 10 sends out a signal at the firHj level from its output terminal 10.

Also, when N2(N(Nl), the comparator 9 sends out a signal at the output terminal 9a!1lrHJ level, and depending on the output state of the comparators 8-10, the
Any one of 3 becomes the set state.

On the other hand, the AND gate 14 passes the clock signal sent from the reference clock generator 15 during the generation period of the input origin position detection signal, and
send to the other end. The clock signal sent to the other end of the AND gates 11 to 13 is applied to the AND gates (11 to 1
3) and is sent to the subsequent counter. In other words, the origin position 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 If the deviation of the count value is less than ±180° in terms of the steering angle, when the origin position detection signal is generated at the rotation center position, the counter 6
The output of comparator 9 is r based on the count value at
Becomes HJ. Furthermore, when the origin position detection signal is generated at one rotation position in the clockwise direction, the output of the comparator 8 becomes rH based on the current value in the counter 6, and when it occurs at the one rotation position in the left direction, the output of the comparator 10 is It becomes rHJ. Therefore, while the origin position detection signal is being generated at the rotation center position, the counter 17 counts the clock signal of the reference clock generator 15, and while the origin position detection signal is being generated at the rightward one rotation position, The counter 16 counts the clock signals. Furthermore, while the origin position detection signal is being generated at the one rotation position in the left direction, the counter 18 counts the clock signal. In other words, each of the counters 16 to 18 replaces the time during which the origin position 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 integrates it. do. And each counter 16~
The count value at 1B is taken into the start circuits 20 to 22 by the one-shot signal of the monostable multivibrator 19, which operates at the falling edge of the outgoing timer signal sent out by the timer circuit 35. On the other hand, the counters 16 to 18 after the count value has been taken in are reset by the 1-shot signal of the monostable multivibrator 34 that operates at the falling edge of the 1-shot signal sent out by the monostable multivibrator 19, and The 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 latch 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, it is traveling in a straight line. Therefore, the cumulative time for the origin position detection signal to be sent at the rotation center position of the rotating disk is Direction 1
It is longer than the rotation position and the leftward one rotation position.

Therefore, if the deviation of the current value in the counter 6 is less than +180 in terms of the steering angle and in normal driving conditions, the count value β taken into the latch circuit 21 will inevitably be the maximum. Tsumashi, decoder 26
is determined by the magnitude relationship of the count values α, β, and γ in the latch circuits 20, 21, and 22.
Alternatively, an "H" level signal is transmitted from 261. In such a state, if the AND gate 12 passes the clock signal sent from the reference clock generator 15, the other input terminals of the Nandt gates 29 and 32 will become rH.
J level, the input signal input to the monostable multivibrator 33 falls at 9, a reset signal is input to the UP/DOWN counter 6, and the count value becomes zero. Finally, the U P/D OWN counter 6 is reset 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. UP/DOW when the rotating disk 1 is truly located at the rotation center position
Since the N counter 6 is reset, the UP/DOWN counter 6 can be appropriately corrected. Note that the reset signal sent by the monostable multivibrator 33 is transmitted to the latch circuit 2.
0 to 22 are also input to reset the latch operations in these latch circuits and prepare for the next data acquisition operation. Although the explanation has been made on the assumption that there is a certain angle, the count value in the UP/DOWN counter 6 can be corrected without any problem even if the angle is greater than +180°.

For example, assume that the deviation of the count value in the UP/r)OWN counter 6 is +180 or more, for example, +360 in terms of the steering angle. At this time, UP/DO
The count value N sent by the WN counter 6 is greater than or equal to N1 at the rotation center position of the rotating disk and at the one rotation position in the right direction, and is N2 (N (Nl) at the one rotation position in the left direction.
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 rHJ 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 "H" level, and the clock signal passing through the AND gate 12 is integrated and counted by the counter 17. While the automobile is running, most of the above-mentioned movements are straight ahead, and therefore the origin position detection signal is sent out at the rotation center position for the longest time. The counter 16 counts including the transmission time of the origin position detection signal at one rotation position in the right direction, but the count value includes an extremely small one rotation position component in the right direction. There is no problem in determining the point in time when the clock signal is inputted via the vehicle as the point in time when the vehicle is traveling straight ahead. That is, latch circuits 20, 21 and 2
α incorporated into 2.

By comparing the count values .beta. and .gamma. using comparators 23 to 25, it is determined that .alpha. is the maximum, and a signal of 1) rHJ level is sent to the output terminals 269 and 26h of the decoder 26. When the clock signal is sent out through the AND gate 11, that is, when the rotating disk 1 is truly located at the rotation center position among the three origin positions, the other input of the NAND gates 30 and 31 is When the end reaches the "H" level, 9, the UP/DOWN counter 6 will be reset and its count value will be properly corrected. Similarly, when the angle is -180 or more, when the count value γ in the latch circuit 22 is the maximum and the rotating disk 1 is truly located at the rotation center, the UP/DOWN counter 6 is K so that the count value can be corrected appropriately.

In this embodiment, the U P/D OWN counter 6 is reset by determining the straight-ahead steering position of the vehicle, but the U P/D OWN counter 6 is not limited to determining the straight-ahead steering position of the vehicle, and may be linked to external operations. Needless to say, the rotation center of a rotating body can be determined by comparing the residence time of the origin position, and various controls can be performed based on this determined rotation center. Extremely high.

〔Effect of the invention〕

As explained above, according to the method for determining the center position of a rotating body according to the present invention, a predetermined rotation angle position of the rotating body that rotates clockwise and counterclockwise in conjunction with an external operation is set as the origin position, and one The origin position residence time for each rotation is accumulated within a predetermined time, and the origin position with the maximum accumulated value is determined as the rotation center position of this rotating body in the clockwise and counterclockwise directions. Among the origin positions located every other rotation of the body, the position with the maximum dwell time can be determined as the rotation center position of the rotating body.For example, this rotating body can be rotated in conjunction with the steering wheel of a car, etc. In this case, it is possible to determine the straight-ahead steering position, and it is possible to correct the miscount of the counter in the rotational position detecting device at the time of determining the straight-ahead steering position.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a method for determining the center position of a rotating body according to the present invention, and FIG. 2 is a schematic diagram showing a rotational position detection sensor used in this method for determining the center position. 1...Rotating disk, 1b...Slit for detecting origin position, 2 to 4 fists...Photo interrupter, 6---
- UP/DOWN counter, 16-18...Counter, 20-22, φ...Latch times L23-25...
・Comparator, 26... Working ・Decoder, 35...
timer circuit.

Claims (1)

[Claims] A rotating body that rotates clockwise and counterclockwise in conjunction with an external operation, and an origin position detection means that detects the origin position of the rotating body every rotation, with a predetermined rotation angle position of this rotating body being the origin position. and integrating each of the home position residence times for each rotation of the rotary body within a predetermined time, and determining the home position where the cumulative value is the maximum as the center position of rotation of the rotary body in the clockwise and counterclockwise directions. A method for determining the center position of a rotating body, characterized in that the center position of a rotating body is determined.