JPS62163119A - Method for deciding center position of rotating body - Google Patents

Abstract

PURPOSE:To avoid accumulation of errors by deciding the original point position which stops continuously while a car is traveling prescribed distance or longer as the rotational center position of a rotating body and then varying said prescribed distance on the basis of a prescribed speed of the vehicle. CONSTITUTION:A vehicle does not travel 30m or longer in a state where the original point position of a rotary disk 1 is stopped at the right and left single rotation positions. Thus the original point position that can stop continuously while the vehicle travels 30m or more is decided as the rotational center position of the disk 1. Here the maximum speed obtained stably in a state where a steering handle is fixed at the single rotation steering position is limited to 20-30Km/h. Therefore the original point position of the disk 1 is never stopped at the right and left single rotation positions while the vehicle is traveling at a speed higher than 30Km/h. Thus the original point position which stops or passes at >=30Km/h traveling speed is equal to the rotational center position of the disk 1.

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 the steering wheel of a vehicle, particularly an automobile. The present invention relates to a center position determination method.

[Conventional technology]

Conventionally, in vehicles, especially 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. and 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°, and the electrical signals are counted to detect the rotational direction and rotational position of the nozzle.

[Problem that the invention seeks to solve]

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, There was a problem with the system malfunctioning.0-Also, in order to reduce power consumption, if a method was used to cut off the power supply to the rotational position detector after the ignition switch was turned off, the next time the ignition switch was turned on. The changes in the rotational position of the handle up to this point result in errors that accumulate.

[Failure to solve the problem]

The present invention has been made in view of the above-mentioned problems, and has a predetermined rotational angle position of a rotating body that rotates clockwise and counterclockwise in conjunction with steering of a vehicle as an origin position.
Among the origin positions that are located for each rotation of this rotating body, the origin position where the vehicle remains continuously while traveling for a predetermined determination distance or more is determined as the rotation center position of this rotating body, and
The predetermined distance can be varied using a predetermined traveling speed of the vehicle as a boundary.

[Effect]

Therefore, according to the present invention, among the origin positions that are located every other rotation of the rotary body that rotates in conjunction with steering of the steering wheel, the origin that remains continuously while the vehicle travels a determined distance corresponding to the current vehicle speed. The position can be determined as the rotation center position of the rotating body.

〔Example〕

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

In the figure, reference numeral 5 indicates an UP/DOWN switching circuit which inputs a 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 wheel steering, and 6 This is UP/D O'W
UP/DO which inputs the processed signal sent out by the switching circuit 5
A WN counter, 7 is a decoder which selects an output terminal (not shown) at a position corresponding to the count value of the counter 6, and sets the level to rLJ or "H"; This is a lamp drive circuit that changes the irradiation direction of a headlamp (not shown).

The rotational position detection sensor shown in FIG. 2 is composed of a rotating disk 1 that rotates in conjunction with the steering of an automobile steering wheel, and photointerrupters 2 to 4 each having a light emitting element and a light receiving element. , photointerrupters 2 and 3 are
They are arranged adjacent to the passing positions of the sulins Ha of the same shape, which are provided 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 a phase shift of approximately 90° in the waveform. This pulsed electric signal is UP/DOWN.
The signal is input to the N switching circuit 5. Furthermore, a slit ib for detecting the origin position is independently provided at a predetermined rotational angle position on the outer circumferential edge surface of the rotating disk 1, and passage through this slit 1b is detected by a seven-way interrupter 4. It has become. In other words, the rotational position where the slit 1b faces the 7-way interrupter 4 is set to the rotary disk 1.
This origin position is set in association with the steering wheel steering position (hereinafter, this steering position will be referred to as the steering wheel center) when the vehicle is traveling straight ahead. Tsumashi,
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 centered at the handle center. The origin position of the rotary disk 1 is detected to shift by 3600 degrees for each rotation of the handle 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 photointerrupter 4 has to detect a total of three origin positions including the rotation center. When detecting the origin position, the rHJ level is applied to one of the input terminals of the AND gate 9 in FIG. An origin position detection signal is input. The slit 1b for detecting the origin position has a slightly thicker slit shape so that the origin position can be detected over a slightly wider range of handle play υ.

On the other hand, the UP/DOWN switching circuit 5 processes the input pulsed electric signal and sends out a number of up and down signals depending on the right steering amount of the steering wheel and the left steering lid. 9. The UP/DOwN counter 6 is configured to amplify or count down its count value by the number of input up signals or down signals (i).

That is, the count value in the UP/DOWN counter 6 is determined to be zero when the rotating disk is at the rotation center position, and when the steering wheel is turned to the right, the count value is sequentially increased, and when the steering wheel is turned to the left, the count value is increased. pThe count value is set to decrease sequentially. And this UP
The count value sent out by the /D OWN counter 6 is input to the decoder T, and by the operation of the lamp drive circuit 8 based on the output state of the decoder 7, the irradiation direction of the headlight is controlled in conjunction with steering wheel steering. It has become so.

On the other hand, a distance signal is input to the other input end of the AND gate 9 via a variable judgment distance circuit 10. That is, the judgment distance variable circuit 10 is NPN
A vehicle speed determination circuit 11 consisting of a transistor Trz, a diode)'Dl, a capacitor Ct, a comparator CP1, and resistors R1 to R7, and a frequency divider 12. ANDGATE 13 and 14. Inverter 15 and or gate 16
A signal sent out as the car travels, for example, a vehicle speed signal sent out from a vehicle speed sensor (not shown) is input as a distance pulse after waveform shaping to its input terminal 1Oa. It looks like this. This distance pulse is input to one end of the AND gate 14 via the frequency divider 12, and is also input to one end of the AND gate 13 and the vehicle speed determination circuit 11.

The period of the distance pulse input to the vehicle speed determination circuit 11 becomes shorter as the vehicle speed increases.
The switching speed of i is increased to generate a potential in the capacitor C1 according to the vehicle speed, and the potential generated in the capacitor C1 is input to the non-inverting input terminal of the comparator CP1. And the controller CP
A predetermined voltage vl determined by the voltage division ratio of resistors R6 and R7 is set at the inverting input terminal of I as a comparison reference voltage.
The output of this comparator CP1 is input to the other end of the AND gate 14 via the inverter 15, and is also input to the other end of the AND gate 13. The outputs of AND gates 13 and 14 are input to AND gate 16, and the output of OR gate 16 is input to AND gate 9 as a distance signal.

Therefore, when the distance signal input to the AND gate 9 is generated during the origin position detection signal, the AND gate 9
A set signal is sent to the S input of the R-87 lip-flop circuit 18 when the distance signal input to the divider IT overflows.

Note that the origin position detection signal input to the AND gate 9 is branched and input to the reset terminals of the frequency dividers 12 and 17 and the R input of the flip-flop circuit 18, and the fall of the signal is reset with a small edge. It takes a while. Then, the Q output of the flip-flop circuit 18 is r
The counter 6 is reset when it reaches the HJ level.

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 and 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, UP/
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 are cases where you can get it. If such a deviated count value is input to the decoder 7, a problem arises in that the variable operation of the illumination direction of the headlamp, which is controlled using the decoder 7, is deviated 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 illumination direction of the headlight in conjunction with the steering wheel steering without any trouble.

In other words, it is no exaggeration to say that most of the roads that cars travel on are straight roads, and cars do not travel long distances with one rotation of the steering wheel.

According to the inventor's research based on an actual vehicle, there are cases where the vehicle travels for a relatively long time with the steering wheel turned once on a U-turn road, etc., but the distance traveled was less than 30 meters. It is impossible to travel for more than 30 m with the origin position of the rotating disc 1 stopped at one rotation position in the right and left directions, and therefore the origin position at which it can stay continuously while traveling for more than 30 m is the same. This is the rotation center position of the rotating disk.

Now, let's consider the speed that a car can achieve with the steering wheel fixed in the straight-ahead steering position and the one-turn steering position.The speed that can be achieved with the steering wheel fixed in the one-turn steering position depends on the performance of the car and tires. It is clear that the limit will naturally increase and the speed will be lower than that which can be achieved in the straight steering position. According to the inventor's research based on an actual vehicle, the maximum speed that can be stably achieved with the steering wheel fixed in the one-turn steering position is 20 to 30 km/h, and therefore, the speed at which the vehicle is running at a speed exceeding 301 an/h is The origin position of the rotating disk 1 does not stay at one rotation position in the right or left direction, and the origin position where the rotating disk 1 stops or passes while running at a speed exceeding 301 an/h becomes the rotation center position of the rotating disk. The origin position detected when running at a speed of 3301 an/h or less includes both the right and left direction one rotation position and the rotation center position, and the origin position is within 30 m of these origin positions.
The origin position where the vehicle continues to stay while traveling is the rotation center position. Therefore, for running conditions exceeding 30 kIn/h, the origin position detected above that speed is taken as the rotation center position, and 30 kIn/h! For driving conditions below I/h, if the origin position where the rotation center remains continuously while traveling for 30 m or more is set as the rotation center position, the true rotation center position can be determined in all speed ranges, and based on this determination result. Based on this, it is considered that the counter 6 can be corrected appropriately.

However, in reality, even when driving at speeds exceeding 30 km/h, it is possible to turn the steering wheel once at - moment, and in such a case, there is a risk of misjudgment of the rotation center position. be. However, this embodiment is configured so that there is no risk of such a misjudgment, and the reference voltage Vl in FIG. The dividing ratio including the dividers 12 and 17 is set to a value corresponding to a running distance of 30 m, and the dividing ratio of the dividing unit 17 alone is set to a value corresponding to a running distance of 5 m.

Assume that the vehicle speed is now 301 an/h or less. At this time, since a voltage exceeding the reference voltage Vl is not input to the non-inverting input terminal of the comparator CPt, the output of the comparator CPl does not go to the "H" level, and the AND gate 13 is in the reset state and the AND gate 14 is in the set state. Become. Therefore, the distance pulse directly input to the AND gate 13 does not pass through this AND gate 13.
The long-cycle distance pulse sent out after being frequency-divided by the divider 12 passes through the AND gate 14.Then, this distance pulse passes through the OR gate 16 and becomes a distance signal, which is input to the AND gate 9. . On the other hand, an origin position detection signal of the rHJ level is inputted to one end of the AND gate 9 at the rotation center position and one rotation position in the right and left directions of the rotary disk 1, and during the generation period of this origin position detection signal, the AND gate A distance signal passes through 9. Then, when a distance signal equivalent to 30 m or more is input to the branching unit 1γ as a distance pulse, this branching unit 17 overflows.
A set signal is sent and the flip-flop circuit 18 is placed in a set state. In addition to this, flip-flop circuit 1
An rHJ level output signal is sent from the Q output of 8, and the counter 6 is reset. Here, 30
The period during which a distance signal equivalent to m or more is input is 30+! When the vehicle travels straight ahead for 30 m or more at a speed of 1/h or less, the counter 6 is appropriately corrected at the rotation angle position of the rotating disk 1 at this time, that is, at the true rotation center position. Then, in the reset operation of the counter 6, the fall of the origin position detection signal which is branched and inputted to the R input of the flip-flop circuit 18 is canceled at the transition, and thereafter the counter 6 is reset by the rising signal sent from the UP/DOWN switching circuit 5. Signals and down signals will be counted. on the other hand,
Assuming a special case in which the vehicle travels with the steering wheel positioned at the one-turn steering position, the vehicle will not travel for more than 30 meters under such conditions, and therefore the distance signal input to the frequency divider 17 will overflow. Before this, the origin position detection signal falls, and when this signal falls, the frequency dividers 10 and 12 are reset. The counter 6 is not reset when the thumb rotary disk 1 rotates once in the right and left directions, but is reset only when the origin position remains at the rotation center position.

On the other hand, when the vehicle speed is in a fast running state of 30k111/h or more, the reference voltage V is applied to the non-inverting input terminal of the comparator CPI.
Since a voltage exceeding 1 is input, the output of the comparator CP1 becomes "H" level, and this time the AND gate 13 becomes set state and the AND gate 14 becomes reset state. Therefore, only the distance pulse directly input to the AND gate 13 passes through the AND gate 13 and is input to the OR gate 16. Then, this distance pulse passes through the OR gate 16 and becomes a distance signal, and the AND gate 9
sent to. By the way, since the vehicle speed is 301 an/h or more, the origin position detection signal inputted to the AND gate 9 is basically generated only at the rotation center position of the rotating disk. However, in reality, as mentioned above, even if the vehicle is traveling at a speed of 30 km/h or more, it is possible to turn the steering wheel once if the moment is -. An origin position detection signal may be generated. However, the origin position detection signal generated in such a state is instantaneous, and the travel distance is less than 5 meters. In other words, even if the origin position detection signal is generated at one rotation position in the right and left directions, only a small amount of the distance signal passes through the AND gate 9, and the origin position detection signal is generated before the frequency divider 17 overflows. Fall down. The frequency divider 17 is set to over 70 - υ every time a distance signal equivalent to 5 m or more is input in terms of travel distance, and before a distance signal equivalent to 5 m or more is input. It is reset when the origin position detection signal falls. On the other hand, it is clear that the distance traveled in a straight line at a running speed of 30 Ian/h or higher is 5 m or more, and the time divider 17 sends out a set signal to reset the counter 6. However, in this embodiment, as shown in FIG. 3, the distance for determining the rotation center position is varied with respect to the traveling speed.
If it is less than aa/h, the judgment distance is 30m, and 3
To 0! If the speed is 1/h or more, the determination distance is set to 5 m. By doing this, even if the steering wheel is rotated once while driving at speeds exceeding 301 an/h, the true rotation center position can be determined without fail. 6 can be reset appropriately. Therefore, even if counter 6 makes a miscount, 30kIl
/h or less, when you drive straight for more than 30m, the 30
At 1an/h or more, the count value is properly corrected when the plate has moved straight ahead by 5mm or more, and even if the counter 6 makes a miscount thereafter, the correction is made appropriately at the true rotation center position of the rotating disk. , it becomes possible to control the direction of illumination of the headlight in conjunction with steering wheel steering without any trouble.

In addition, in this example, the determination distance at 30 to 11/h or less and the determination distance at 30 km/h or more were set to 5 m, but the determination distance is not necessarily limited to such values. It goes without saying that the distance may be set to any value as long as there is no risk of the vehicle being traveled in a state in which the vehicle is turned on. In addition, in this example, the boundary speed at which the determination distance is varied is set at 30 km/h, but any speed can be set as long as it is normal driving and there is no risk of driving with the steering wheel rotated once. Needless to say, the boundary speed may be set to a certain value, and for example, this boundary speed may be set at a plurality of locations and the determination distance in each speed range may be varied.

In addition, 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 described, but this is not limited to the cornering lamp system. - It may be used to correct a counter in another external system that is controlled in conjunction with steering wheel steering. Also,
Needless to say, it is possible to determine the rotation center of a rotating body that rotates in conjunction with steering wheel steering, and various controls on the vehicle can be performed based on this determined rotation center, which is extremely useful. expensive.

〔Effect of the invention〕

As explained above, according to the method for determining the rotation center position of a rotating body according to the present invention, the predetermined rotation angle position of the rotating body that rotates clockwise and counterclockwise in conjunction with steering of the vehicle is set as the origin position, Among the origin positions that are located for each rotation of this rotary body, the origin position where the vehicle remains continuously while traveling for a predetermined determination distance or more is determined as the rotation center position of this rotary body, and the predetermined determination distance is Since the predetermined running speed of the vehicle is variable as a boundary, the vehicle continues to travel for a distance longer than the determination distance corresponding to the current vehicle speed among the origin positions located every other rotation of the rotating body that rotates in conjunction with steering wheel steering. The origin position at which the vehicle stops can be determined as the rotation center position of the rotating body, and by appropriately setting the predetermined speed and predetermined judgment distance, the straight steering position of the vehicle can be made to correspond to the rotation center position of the rotating body. Since it is possible to make an accurate determination, it is possible to correct, for example, a miscount of a counter in a rotational position detecting device at the time of determining the straight steering position.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing an embodiment of the method for determining the center position of a rotating body according to the present invention, FIG. 2 is a schematic configuration diagram showing a rotational position detection sensor used in this method for determining the center position, and FIG. It is a graph showing a change in determination distance with respect to traveling speed. 1...Rotating disk, 1b...Slit for detecting origin position, 2-4...Photo interrupter, 5...
UP/DOWN switching circuit, 6...UP/DOWN counter, 9, 13.14" -* *AND gate, 1
0... Judgment distance variable circuit, 11... Vehicle speed judgment circuit, 12,1γ... Frequency divider, i6m**a OR gate, 19---RSS flip floral circuit.

Claims (1)

[Claims] A rotating body that rotates clockwise and counterclockwise in conjunction with steering of a vehicle, and an origin position that detects the origin position of this rotating body every rotation, with a predetermined rotation angle position of this rotating body being the origin position. a detection means, and an origin position at which the vehicle remains continuously while the vehicle travels for a predetermined determination distance or more among the origin positions located for each rotation of the rotary body, is detected by rotating the rotary body in clockwise and counterclockwise directions. 1. A method for determining a center position of a rotating body, comprising: center position determining means for determining a center position, and a predetermined determination distance in the center position determining means is varied with a predetermined traveling speed of the vehicle as a boundary.