JPH056850B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method for determining the center position of a rotating body that is suitable for determining the rotational center position of a rotating body that rotates in conjunction with steering wheel operation of a vehicle or the like. [Prior Art] Conventionally, in vehicles, especially automobiles, a plurality of slits are formed at equal angular intervals on a rotary disk that rotates in conjunction with steering wheel operation, and two photo interrupters are installed at the positions where the slits pass. They are placed adjacent to each other and perform various controls linked to steering wheel operation. That is, in conjunction with the steering wheel operation, pulsed electrical signals having the same waveform but with a phase difference of about 90° are generated in the first and second photointerrupters,
By counting these electrical signals, the rotational direction and rotational position of the handle are detected. [Problems to be Solved by the Invention] However, with such a conventional rotational position detector, when the counter miscounts due to electrical noise, etc., there is no means to correct the error. There was a problem that the system malfunctioned due to the accumulation of errors. [Means for Solving the Problems] The present invention has been made in view of the above problems, and is based on a predetermined rotational angle position of a rotating body that rotates clockwise and counterclockwise in conjunction with external operations. The origin position is the position rotationally opposite to the angular position, and for each origin position that is located every rotation of this rotating body, the time during which the rotating body is located at the origin position (origin position residence time) or the origin position The frequency at which the rotating body passes (origin position passing frequency) is integrated, and the origin position where the integration result is the maximum within a predetermined time is determined as the rotation center position of the rotating body in the clockwise and counterclockwise directions. In addition, with respect to the operating period of the direction indicating means accompanying the direction change operation around the rotation center of the rotating body, the home position residence time or the home position passing frequency is not added to the integration result. [Operation] Therefore, according to the present invention, the cumulative value of the residence time and passing frequency during the period excluding the period in which a turn signal is generated within a predetermined time among the origin positions located every other revolution of the rotating body. The origin position where is maximum is
It is 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 a steering wheel operation interlocking system to which this center position determination method is applied. In the figure, reference numeral 5 denotes an UP/DOWN switching circuit which inputs the pulsed electric signal sent out by the rotational position detection sensor (Fig. 2) and sends out a processed signal (up signal and down signal) according to the steering wheel operation; 6 is this
This is an UP/DOWN counter that receives as input the processed signal sent out by the UP/DOWN switching circuit 5. The rotational position detection sensor shown in FIG. 2 is composed of a rotating disk 1 that rotates in conjunction with steering wheel steering, and photo interrupters 2 to 4 each having a light emitting element and a light receiving element. 2 and 3 are arranged adjacent to the passage positions of the slits 1a of the same shape, which are opened at equal angular intervals on the outer peripheral edge surface of the rotary disk 1. Then, as the rotating disk 1 rotates and passes through the slit 1a, a pulsed electrical signal having the same waveform but with a phase shift of approximately 90° is generated in the photointerrupters 2 and 3. electric signal
It is designed to be input to the UP/DOWN switching circuit 5. Furthermore, a slit 1b for detecting the origin position is independently provided at a predetermined rotation angle position on the outer peripheral edge surface of the rotating disk 1, and a photo interrupter 4 arranged at a reference angle position passes through this slit 1b. It is now possible to detect That is, the position where the slit 1b at a predetermined rotation angle position rotates and faces the photo interrupter 4 at the reference angle position is the origin position of the rotating disk 1, and this origin position is the steering wheel operation position (hereinafter referred to as
This steering position is set in association with the handle center. In other words, at the handle center, the rotating disk 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 disk), and the handle centering on the handle center. The origin position of the rotating disk 1 is detected to be shifted by 360 degrees for each rotation in the clockwise and counterclockwise directions. in general,
The steering wheel of an automobile can be turned clockwise (hereinafter referred to as rightward direction) and counterclockwise (hereinafter referred to as leftward direction) around the center of the steering wheel by less than two turns each. The photo interrupter 4 detects a total of three origin positions including the rotation center.
When detecting this origin position, an "H" level origin position detection signal is input to the input terminal 14a of the AND gate 14 in FIG. On the other hand, the UP/DOWN switching circuit 5 processes the input pulsed electrical signals and outputs up signals and down signals to its output terminals 5a and 5b according to the amount of right and left turning of the steering wheel. The UP/DOWN counter 6 is designed to up-count or down-count its count value by the number of input UP or DOWN signals. That is, the count value of the UP/DOWN counter 6 is set to zero when the rotating disk 1 is at the rotation center position, and by turning the steering wheel to the right, the count value increases sequentially, and by turning the steering wheel to the left, the count value increases. The count value is gradually decreasing. Then, the UP/DOWN counter 6 transfers the count value to the decoder 7 and comparator 8.
~10, and decoder 7
selects an output terminal (not shown) at a position corresponding to the input count value, sets the level to "L" or "H", and outputs an external device that operates in conjunction with the steering wheel, such as a cornering lamp system, etc. control. 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.
It compares the count value inputted through the UP/DOWN counter 6 and sets its output level to "H" level. That is, the comparator 8 is set with a count value N _{1 corresponding to a steering position of 180 degrees to the right (+ direction) centering on the hand center as the + direction reference value, and the comparator 10 is set with a count value N 1} corresponding to a steering position of 180 degrees to the right (+ direction) centering on the hand center. The count value corresponding to the steering position of 180° leftward (-direction)
_N2 is set as the negative direction reference value. The comparator 9 is set with the above N ₁ and N ₂ as center reference values, and the comparator 9 is
When the count value input via the UP/DOWN counter 6 is greater than or equal to N ₂ and less than N ₁ , that is, when the input count value is N, if N ₂ <N < N ₁ , the output terminal The level of 9a is set to be the "H" level. Also, comparator 8
When the input count value N is N≧N ₁ , the level of the output terminal 8a is set to “H” level, and the comparator 10 sets the input count value N to the “H” level.
When ≦N ₂ , the level of the output terminal 10a is set to “H”
It is becoming more and more level. The "H" level output signals sent out from the comparators 8 to 10 are input to one ends of the AND gates 11 to 13.
The output of the AND gate 14 is input to the other end of the gate 3. The AND gate 14 has three input terminals, and the input terminal 14a has the second
An origin position detection signal is inputted via the photo interrupter 4 shown in the figure, and a clock signal sent from a reference clock generator 15 is inputted to the input terminal 14b. Then, a turn signal is inputted to the remaining input terminal 14c via a turn signal generation circuit 36. The turn signal generation circuit 36 includes a flasher unit 36a, a turn signal switch 36b that is operated when the vehicle changes direction, right and left direction indicator lights 36c and 36d, and an NPN transistor T _r1 .
and T _r2 , a capacitor C ₁ , diodes D ₁ to _{D 3} and resistors R ₁ to R ₅ , and the voltage generated at the connection point between the collector of the transistor T _r2 and the resistor R ₅ is applied to the input terminal of the AND gate 14. 14c. That is, when the turn signal switch 36b is operated when turning the car to the right, the direction indicator light 36c starts blinking, the transistor T _r1 turns on and off, and the on and off of the transistor T _r1 causes the capacitor C ₁ to turn on and off. As the charging level increases, the transistor T _r2 is turned on, and the signal voltage input to the input terminal 14c of the AND gate 14 is inverted from the "H" level to the "L" level. In other words, this "L" level signal voltage is the turn signal generated by the turn signal generation circuit 36, and this turn signal is used when turning the turn signal switch 36b to the left.
It is generated in the same way as above when you operate . On the other hand, the outputs of AND gates 11 to 13 are input to counters 16 to 18,
The count value of each counter is taken into the latch circuits 20 to 22 at the rising edge of the 1 shot signal sent out by the monostable multivibrator 19, and the count value taken into the latch circuits 20 to 22 is input to the predetermined value of the comparators 23 to 25. It is designed to be input to the input terminal of. 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 from the latch circuit 20 is input to the non-inverting input terminals of the comparators 23 and 25, and the count value sent out from the latch circuit 21 is The count value β is the comparator 2
The count value γ sent out from the latch circuit 22 is input to the inverting input terminals of the comparators 24 and 25. and,
The outputs of the comparators 23 to 25 are input to input terminals 26a to 26c of a decoder 26, and the decoder 26 has input terminals 26a to 26c.
A predetermined terminal among the output terminals 26d to 26i is selected based on a combination of signals inputted to the terminal, and the output level of the selected terminal is set to the "H" level. Table 1 shows the truth table of the decoder 26.

〔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, the predetermined rotational angular position of the rotating body that rotates clockwise and counterclockwise in conjunction with an external operation is a position rotationally opposite to the reference angular position. The origin position is defined as the origin position, and for each origin position that is located every rotation of this rotating body, the time that the rotating body is located at that origin position (origin position residence time) or the frequency that the rotating body passes through that origin position ( The origin position passing frequency) is integrated, and the origin position where the integration result is the maximum within a predetermined time is determined as the rotation center position of the rotating body in the clockwise and counterclockwise directions. Regarding the operating period of the direction indicating means that accompanies the direction change operation centered at Among the positions, the origin position at which the cumulative value of the dwell time and passing frequency during a period excluding the turn signal generation period within a predetermined time is the maximum is determined as the rotation center position of the rotating body. When the wheel is rotated in conjunction with the steering wheel of a car, etc., there are also special driving cases where the vehicle is stopped for a long time with the steering wheel rotated once and the turn signal raised while waiting for an oncoming vehicle or pedestrian to pass. Including this, it becomes possible to quickly and accurately determine the straight-ahead steering position, and it becomes 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 the drawing]

FIG. 1 is a block configuration diagram showing an embodiment of a steering wheel steering interlocking system to which the method for determining the center position of a position body according to the present invention is applied, and FIG. 2 is a schematic configuration diagram showing a rotational position detection sensor used in this system. 3 are diagrams for explaining the neutral position estimation method disclosed in the prior art (Japanese Unexamined Patent Publication No. 17012/1983). 1...Rotating disk, 1b...Slit for detecting origin position, 2-4...Photo interrupter, 6...
UP/DOWN counter, 14...and gate,
15...Reference clock generator, 16-18...Counter, 20-22...Latch circuit, 23-25
... Comparator, 26 ... Decoder, 35 ...
Timer circuit, 36...Turn signal generation circuit, 36
c...Right direction indicator lamp, 36d...Left direction indicator lamp.

Claims (1)

[Claims] 1. A rotating body that rotates clockwise and counterclockwise in conjunction with an external operation, and a position where a predetermined rotational angular position of this rotating body rotationally opposes a reference angular position is the origin position, and this rotation For each origin position where the body is located every revolution,
The time during which the rotating body is located at the origin position or the frequency at which the rotating body passes through the origin position is integrated, and the integration result indicates the maximum origin position within a predetermined time in the clockwise and counterclockwise directions of the rotating body. and a center position determination means for determining the rotation center position in the clockwise direction, and the direction indicating means operation period accompanying the direction change operation centered on the rotation center of the rotating body is determined by the time during which the rotating body is located at the origin position. Alternatively, a method for determining the center position of a rotating body, characterized in that the frequency of passing through the origin position is not added to the integrated result.