JPH02216410A - Deciding method for center position of rotary body - Google Patents

Abstract

PURPOSE:To correct miscounting of a counter in a rotational position detector by deciding the original point position which the other original point positions are not detected during traveling a prescribed distance after the detection for the original point position, as a rotational center position of the rotary body. CONSTITUTION:A rotary disk 1 rotating with the interlock to a handle steering for automobile is made to position so as a handle center at the time of the straight traveling is positioned to the original point where a slit 1b is opposed to a photo-interrupter 4. The handle center is detected with a shift of the original point position by 360 deg. for every one rotation of the handle to right/left. Among this original point positions for every one rotation, when the handle steering more than 180 deg. is not operated during traveling the prescribed distance e.g. 200 meters after a detecting signal for the original point position is generated and also the next original point position is not detected, the original point position at this time is decided as the rotational center position.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is suitable for determining the center position of a rotating body that rotates in conjunction with steering wheel steering of a vehicle, etc. It is about the method.

[Conventional technology]

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

In other words, the first and second
A pulse-like electrical signal having the same waveform but with a phase shift of approximately 90° is generated in the photo ink club, and the electrical signals are counted to detect the rotational direction and rotational position of the handle.

[Problem to be solved by the invention]

However, with such conventional rotational position detectors, if the counter miscounts due to electrical noise, etc., there is no means to correct the error, and as the error accumulates, the system There was a problem that malfunctions occurred.

In addition, in order to reduce power consumption, if a method is adopted in which the power supply to the rotational position detector is cut off after the ignition switch is turned off, the rotation of the handle until the next ignition switch is turned on is Changes in position lead to errors that are accumulated.

[Means to solve the problem]

The present invention has been made to solve such problems, and has a predetermined rotational angle position of a rotating body that rotates clockwise and counterclockwise in conjunction with steering wheel steering as an origin position,
Among the origin positions that are located for each revolution of this rotating body, the origin position where no other origin position is detected until traveling a predetermined distance after detecting the origin position is determined as the rotation center position of this rotating body. It is something.

[Effect]

Therefore, according to the present invention, among the origin positions that are located every other revolution of the rotating body, the origin position where no other origin position can be detected during the period from the detection of the origin position to the time when the rotating body travels a predetermined distance is set to the origin position of the rotating body. It can be defined as the rotation center position.

(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 example of this method for determining the center position.

In the same figure, 5 is an UP/DOWN switching circuit which inputs the pulsed electric signal sent out by the rotational position detection sensor (Fig. 2) and sends out processed signals (up signal and down signal) according to the steering of the steering wheel. , 6 and 7 are this UP/
The first and second UP/DOWN counters are powered by the processed signal sent by the DOWN switching circuit 5, and 8 is an output terminal (8) located at a position corresponding to the count value counted by the counter 6.
(not shown) and set the level to “L” or “H”.
A decoder 9 is a lamp drive circuit that changes the direction of illumination of a headlamp (not shown) in accordance with the output state of the decoder 8.

The rotational position detection sensor shown in FIG. 2 is composed of a rotating disk 1 that rotates in conjunction with the steering wheel of an automobile, and photointerrupters 2 to 4 each having a light emitting element and a light receiving element. Photo interrupters 2 and 3 are
They are arranged 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 I rotates and the sulin t-1a passes through the photoinkractors 2 and 3, pulsed electrical signals having the same waveform but with a phase shift of about 90'' are generated. This pulsed electrical signal is UP/
It is designed to be input to the DOWN switching circuit 5. Further, a slit lb for detecting the origin position is independently provided at a predetermined rotational angle position on the outer peripheral edge surface of the rotating disk 1, and the passage through this slit 1b is detected by the photo ink clubter 4. It has become. That is, the rotational position where the slit 1b faces the photo ink club 4 is the origin position of the rotary 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 figure (hereinafter, this position will be referred to as the rotation center of the rotating disc), and the rotation disc 1 is located at the handle center. The origin position of the rotary disk 1 is detected to be shifted by 360' each time the handle is rotated clockwise or counterclockwise. Generally, the steering wheel of a car is rotated clockwise (hereinafter referred to as
The photo ink printer 4 can be rotated less than two times each in the right direction (defined as the right direction) and counterclockwise direction (hereinafter defined as the left direction). Therefore, the photo ink printer 4 has a total of three origins including the rotation center. The position is to be detected, and when detecting the origin position, an rHJ level origin position detection signal is input to one of the input terminals of the AND gate TO in FIG.

On the other hand, the UP/DOWN switching circuit 5 processes the input pulsed electric signal and sends out a number of amplifier signals and down signals corresponding to the amount of right and left steering of the steering wheel. The IIP/DOWN counters 6 and 7 are configured to amplify or down-count their count values by the number of input A-knob signals or down signals. That is, the count value in the UP/DOWN counter 6 is set to zero when the rotating disk is at the rotation center, and as the steering wheel is turned to the right, the count value increases sequentially.
The count value decreases sequentially by left steering. Then, the count value sent by the tlP100WN counter 6 is input to the decoder 8, and by the operation of the lamp drive circuit 9 based on the output state of the decoder 8, the irradiation direction of the front lamp is controlled in conjunction with steering wheel steering. It looks like this. In addition, it goes without saying that the UP/DOWN counter 7 also sequentially increases the count value by turning the steering wheel to the right, and decreases the count value by turning the steering wheel to the left. When the current reaches the rHJ level, the count value in this carantuff is reset and returns to zero.

On the other hand, the Q-bar output of the RS flip-flop circuit 11 is input to the input terminal on the other side of the AND gate 10, and the output of the AND gate 10 is set to the S input of this flip-flop circuit 11. It is designed to be input as a signal.

The Q output of the flip-flop circuit 11 is input to one end of AND gates 12 and 13, and a pulse signal (distance signal) corresponding to the distance traveled is input to the other end of the AND gate 13. It looks like this. Further, the origin position detection signal input to the AND gate 10 is branched and input to the other end of the AND gate 12, and the output of the AND gate 12 is input to the enable terminal of the comparator 15. It looks like this.

Then, the comparator 15 connects rH to this enable terminal.
When a J level signal is input, the current count value of the UP/DOWN counter 7 is fetched and compared with the reference comparison count value N0=0, and the fetched count value is the reference comparison count value N0. =0, a reset signal is sent to the frequency divider 16. The frequency divider 16 includes an AND gate 13
A distance signal passing through is inputted, and every time this distance signal is inputted as a travel distance of 200 m or more, it overflows and sends a load signal to the UP/DOWN counter 6. And UP/DO
When this load signal is input, the WN counter 6 takes in the count value of the UP/DOWN counter 7 at that time and rewrites the count value. That is, the count value in the UP/DOWN counter is transferred to the UP/DOWN counter 6, and the count value of the counter 6 is rewritten to the transferred count value. Note that the reset signal sent from the comparator 15 and the load signal sent from the frequency divider 16 are branched and input to an OR gate 17, and the output of the OR gate 17 is input to the R terminal of the flip-flop circuit 11. It has become so.

Next, the operation of the device configured in this way will be explained. That is, it is assumed that the gold-plated vehicle is traveling straight ahead and that the rotary disk 1, which rotates in conjunction with the steering wheel, is at the rotation center position as shown in FIG. At this time, TIP/
The count value in the DOWN counter 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 the ignition switch is turned off. There may be cases where there is. If such a deviated count value is input to the decoder 8, a problem arises in that the variable operation of the illumination direction of the headlamp, which is controlled using the decoder 8, is deviated in accordance with the count value. However, in this embodiment, since the correction operation as described below is quickly performed, the direction of illumination of the headlight can be controlled in conjunction with the steering wheel steering without any problem.

In other words, it is no exaggeration to say that most of the roads that cars travel are straight, and cars do not travel long distances with the steering wheel turned once. In other words, even if the origin position detection signal is generated at one rotation steering position of the steering wheel, the generation period is short, and the steering wheel returns to the vicinity of the steering wheel center after traveling a short distance. In the inventor's research based on an actual vehicle, although the vehicle may be driven by turning the steering wheel once on a U-turn road or the like, the distance traveled until the steering wheel is returned to the vicinity of the steering wheel center is less than 200 meters. In other words, after the origin position detection signal is generated at the one-turn steering position, the steering wheel is always steered by a rotation angle of 280" or more until the vehicle travels 200 m. Therefore, after the origin position detection signal is generated, If the steering wheel is not turned more than 1806 times before the vehicle travels 200 meters, it is safe to determine that the origin position at that time is the rotation center position.

Now, the flip-flop circuit 11 and the frequency divider 16 are in the initial set state, and the rotation center position of the rotating disk is
That is, it is assumed that the origin position detection signal is generated at the straight-ahead steering position. At this time, an "H" level origin position detection signal is input to the AND gate 410 and the AND gate 12. At the other end of the AND gate 10, a flip-flop rg
Since the Q bar output of the J path If, that is, the rHJ level signal has already been input, the origin position detection signal input to one end passes through the AND gate 10, resets the UP/DOWN counter 7, and also outputs the flip-flop The pull circuit 11 is brought into a set state. As a result, UP/DOWN
The count value in the counter 7 becomes zero, and the flip-flop circuit 11 sets the levels of its Q output and Q bar output to rHJ and rLJ. flip-flop circuit 1
When the Q bar output of 1 is inverted to "L" level, the gate of AND gate IO is closed, but its Q output is rH
By changing to the J level, the gates of AND gate 12 and AND gate E3 are opened. Therefore, the distance signal passes through the AND gate 13 and begins to be input to the frequency divider 16, and at the same time, the origin position detection signal passes through the AND gate 12. The comparator 15 is activated by the origin position detection signal passing through the AND gate 12, and the UP/DO
The current count value of the WN counter 7 is taken in and compared with the standard comparison count value N0. At this time, the count value of the counter 7 has already become zero due to the origin position detection signal inputted through the AND gate 10, so it matches the reference comparison count value N0=0. Therefore, the comparator 15 does not send a reset signal to the frequency divider 16,
The frequency divider 16 continues to divide the input distance signal. This frequency dividing operation in the frequency divider 16 continues not only during the period when the origin position detection signal is generated at the rotation center position, but also during the period when the origin position detection signal is no longer generated. That is, even if the vehicle is traveling straight at -i, it is actually performing fine steering, and therefore the origin position detection signal may or may not be generated around the rotation center. Needless to say, when the origin position detection signal is generated, as a result of the comparison operation performed in the comparator 15 as described above, the reset signal is not sent to the frequency divider 16. When the origin position detection signal is no longer generated, the comparison operation itself in the comparator 15 is not performed, so that no reset signal is sent to the frequency divider 16.

In other words, after the origin position detection signal is generated at the rotation center position, the origin position detection signal is not generated (even if this occurs, the frequency dividing operation in the frequency divider 16 continues. When traveling for more than 200 m in this state, an overflow of the input distance signal occurs in the frequency divider 16, and a load signal is sent to the UP/DOWN counter 6.
receives this load signal and starts the UP/DOWN counter 7.
The current count value of is taken in and the count value is rewritten. That is, if the rotating disk 1 is at the rotation center position at this point, the karst value in the IP/DOWN counter 7 is zero, and this count value is transferred and the count value in the UP/DOWN counter 6 becomes zero. Become. Also, at this time, if the rotating disk 1 is not at the rotation center position and is rotating (within ±1 rotation), the IMF
/DOWN counter 7 performs accurate counting using the rotation center position as a zero reference, and this count value is transferred to counter 6. In other words, UP/
Even if the DOWN counter 6 makes a miscount, the UP/DOWN counter 6 receives an accurate count value based on the rotation center position, and appropriate correction is performed. The load signal sent from the frequency divider 16 is input to the R terminal of the flip-flop circuit 11 via the OR gate 17, and the flip-flop circuit 11 is reset to prepare for generation of the next origin position detection signal.

Incidentally, the above operation has been described with respect to the operation after the origin position detection signal is generated at the straight-ahead steering position, but while the automobile is running, the origin position detection signal is also generated at the one-turn steering position. Now, flip-flop circuit 11
It is also assumed that the frequency divider 16 is in the initial cent state and the origin position detection signal is generated at the one-turn steering position. At this time, the origin position detection signal at the rHJ level is input to the AND gates 10 and 12 in the same manner as described above, and the count value at the UP/DOWN carantuff becomes zero, and the distance signal begins to be input to the frequency divider 16. .

At this time, the comparator 15 takes in the count value of the counter 7 and compares it with the standard comparison count value N0, but since the count value of the counter 7 is already zero at this point, it matches the standard comparison value N0=O, and the minute The frequency unit 16 continues to perform the frequency dividing operation without being reset. However, as described above, the travel distance from the steering position of one rotation of the steering wheel to the time when the steering wheel returns to the vicinity of the steering wheel center is less than 200 m. Therefore, the origin position detection signal generated at the rotation center position is input to the AND gate 12 until the vehicle travels 200 m, and the comparator 15 performs the comparison operation again at the time when this origin position detection signal is generated. . At this time, the counter 7 taken into the comparator 5
The count value is a count value for one rotation with the one-turn steering position as a zero reference, and does not match the reference comparison count value N,=O. Therefore, the comparator 15 sends out an "H" level signal at this point and resets the frequency divider 16. Here, the timing of the reset signal input to the frequency divider 16 is from when the distance signal begins to be input to the frequency divider 16 until the vehicle travels 200 m. Therefore, the frequency divider 16 is reset without waiting for the overflow of the distance signal, and the UP/DOWN counter 6 is not sent a load (No. 8). In other words, the count value in the counter 7 at this time is This is the count value when one rotation position in the right or left direction is determined as a temporary rotation center position, and the count value in the UP/DOWN counter 6 is not corrected using this count value.

Then, the reset signal sent out by the comparator 15 is passed through the OR gate 17 to the R of the flip-flop circuit-11.
The signal is also input to the terminal, and the flip-flop circuit 11 is reset to prepare for generation of the next origin position detection signal.

As explained above, according to the device according to this embodiment, the UP
/DOWN counter 7 counts each origin position as a temporary rotation center position, but UP/DO
The count value transferred to the WN counter 6 is the count value corresponding to the true rotation center position, and accurate and appropriate correction is performed using this count value, and the headlights are illuminated in conjunction with steering wheel steering. The direction can be controlled without any problem. In addition, after the origin position detection signal is generated at the -1st rotation center position, even if the steering wheel is subsequently steered (within ±11 rotations), the correction in the UP/DOWN counter 6 will be performed appropriately, and the Even in this case, the correction of the headlamp irradiation direction variable operation is reliably performed.

In this embodiment, the frequency dividing ratio of the frequency divider 16 is set to 200 m in terms of travel distance, but it is not necessarily limited to 200 m. Needless to say, it may be set to any value as long as it is longer than the time.

Furthermore, in this embodiment, the correction operation of the counter in a so-called cornering lamp system that changes the illumination direction of the headlight in conjunction with steering wheel steering has been explained. The counter in the system may be corrected.

In addition, this is not limited to counter correction,
It is possible to determine the rotation center of a rotating body that rotates in conjunction with an external operation, and various controls can be performed based on the determined rotation center, which has extremely high utility value.

〔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 steering wheel steering is set as the origin position, and one of the rotating bodies Among the origin positions that are located for each rotation, the origin position where no other origin position is detected until traveling a predetermined distance after the origin position is detected is determined as the rotation center position of this rotating body. Among the origin positions located every other revolution, the origin position where no other origin position can be detected until the vehicle travels a predetermined distance after the origin position is detected can be determined as the rotation center position of the rotating body, for example. When this rotating body is rotated in conjunction with the steering wheel of a car, etc., it becomes possible to accurately determine its straight steering position, and at the time of determining this straight steering position, a miscount of the counter in the rotational position detector is detected. It becomes possible to correct.

[Brief explanation of the drawing]

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. ■...Rotating disk, 1b...Slit for detecting origin position, 2-4...Photo interrupter, 67...UP
/DOWN Counter, 11--・R37 Resopflosub circuit, 15... Comparator, 16... Frequency divider. Patent applicant: Koito Manufacturing Co., Ltd.

Claims (1)

[Claims] A rotating body that rotates clockwise and counterclockwise in conjunction with steering wheel steering, and an origin position detection means that detects the origin position of this rotating body every rotation, with a predetermined rotation angle position of this rotating body being an origin position. Among the origin positions that are located for each revolution of the rotating body, the origin positions where no other origin position is detected until traveling a predetermined distance after the detection of the origin position are determined in the clockwise and counterclockwise directions of the rotating body. A method for determining the center position of a rotating body, characterized in that the determination is made as a rotation center position in a direction.