JPS60158313A - Rotation detector of rotary member - Google Patents

Abstract

PURPOSE:To detect the rotary angle and the rotary direction and to detect the state that a steering wheel is located at a specified position, by a simple constitution in which only two sensors are used. CONSTITUTION:When a steering wheel 2 is turned to the left, each cut-out part 9 and each first through hole 11 cross a first photoelectric switch 18 together. A pulse is generated at every crossing from the switch 18. When the steering wheel 2 is turned to the neutral position under the leftward turning state, a second positioning hole 14 and the first through hole 11, which is located outside the hole, cross the light axes of a second photoelectric switch 19 and the first photoelectric switches 18, respectively. Therefore, detected pulses are outputted from the first and second photoelectric switches 18 and 19. When the steering wheel 2 is turned rightward from the leftward turning, a rotor 6 is turned to the right accordingly. Meanwhile, a rotary plate 10 keeps the static state owing to the friction with a leaf spring 16 until a left side surface 6d of a recess part 6b is contacted with a projection 10a. Then the plate 10 is turned to the right.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotation detection device for a rotating member used for detecting the rotation angle, rotation direction, etc. of a rotating member such as a steering wheel of an automobile.

(Objective of the Invention) The object of the present invention is to detect the rotation angle and rotation direction of a rotating member and to detect the state in which the rotating member is at a specific rotational position by using only two shafts V. It is possible to detect the rotation of the rotary unit 4A during the Song and Qin dynasties by covering the rotation part 4 and the neck, which can be done with an extremely simple configuration.

[Summary of the invention]

The present invention provides a rotor that rotates integrally with a rotating member, and a rotating plate that is connected to the rotating member so that a predetermined margin exists in the rotational direction, and the rotor and the rotating plate are By cleverly utilizing the space between the two sensors and the pulse forming section installed in the rotor and the auxiliary pulse forming section formed on the rotary plate, the rotational member can be detected with only two sensors. It is possible to detect the rotation angle, the rotation direction, and the state in which the rotating member is at a specific rotation position.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to an automobile will be described with reference to the drawings.

In FIGS. 1 and 2, 1 is a steering shaft of an automobile, and 2 is a steering wheel, which is a rotating member fixed to the upper end of the steering shirts 1 to 1 via a spring washer 3 and a nut 4. A base member 5 has a cylindrical portion 5a into which the steering shaft 1 is inserted, and is fixed to a housing (not shown).

6 is a rotor rotatably supported around the cylindrical portion 5a;
A protrusion 6a integrally formed on the upper part is fitted into a hole 2a formed in the steering wheel 2, and this state is held by a compression coil spring 7, so that the steering wheel 2 rotates together. It is provided. Reference numeral 8 denotes an annular flange integrally formed on the outer circumferential surface of the rotor 6 so as to extend outward, and a plurality of notches 9 serving as pulse forming portions are formed along the rotation locus of the rotor 6 with a constant pitch S. (See Figure 2). Incidentally, when the steering wheel 2 is in a predetermined neutral position (a straight-ahead position of the vehicle), the rotor 6 moves the four parts 61 formed on its outer circumferential surface into the second position.
Position as shown in the figure. Reference numeral 10 denotes an annular rotary plate placed on the flange portion 8 so as to surround the solar panel 6, and a projection 10a integrally formed on the inner circumference thereof is fitted into the recess 6b of the solar panel 6. It is connected to the mouth and taro so as to follow the rotation thereof. However, in this case, the structure is such that there is a margin between the width of the recess 6b and the width Xi of the protrusion 10a, as shown in FIG. There is play in the direction of rotation by the amount of play. 11
are first holes drilled at a portion near the outer periphery of the rotary plate 10 so as to be scattered at constant bits S along the rotation locus of the notch 9.
A plurality of first through holes 12, which are auxiliary pulse forming portions, are drilled at a portion near the inner circumference of the rotary plate 10 so as to be scattered at constant bits S along the rotation locus of the notch 9. The number of second through holes 11 and 12 is the same as that of the first through holes 11, which are second auxiliary pulse forming parts. J: Sea urchins are stepped by the above-mentioned dimension corresponding to J: Sea urchins are stepped.

Then, on the rotary plate 10 (the first through hole 11
In the row, a first positioning hole 1 serving as a first position detection pulse forming part is provided corresponding to the protrusion 10a of the rotary plate 10.
3 is bored, and in this case, the positioning hole 13 of the box 1 and the second through hole 12 inside the box 1 are constructed so as to be positioned on the same center line of the rotary plate 10. Further, in the second row of through holes 12 in the rotary plate 10, second positioning holes 14 serving as a second position detection pulse forming part are bored corresponding to the protrusions 10a, and in this case, a box is formed. 2 positioning hole 1
4 and the first through hole 11 on the outside thereof are located on the same center line of the rotary plate 10. Reference numeral 15 denotes a spring holder installed vertically on the base member 5. The center portion of a leaf spring 16 installed between both ends of the spring holder 15 is brought into elastic contact with the outer circumferential surface of the rotary plate 10.
It is meant to give power. A sensor holder 17 is also provided upright on the base member 5, and has arms 17a and 17b that face each other vertically with the flange portion 8 of 6 and the rotary plate 10 interposed therebetween. However, in this case arm 17
a and 17b are located on the center line N (see FIG. 2) passing through the centers of the rotor 6 and the four parts 6b when the steering wheel 2 is in the aforementioned neutral position. Reference numeral 18 denotes a light transmission type first photoelectric switch, which is a first sensor, and this
It consists of a light emitting diode 18a and a phototransistor 18b, which are respectively arranged in the first through hole 11. It is stepped so as to intersect the rotation locus of the first positioning hole 13. One is a second light-transmitting type photoelectric switch which is a second sensor, and this is made up of light emitting diodes 19a and 19b arranged on arms 17a and 17b, respectively, and the optical axis between them is parallel to the second photoelectric switch. Through hole 12. It is provided so as to intersect the rotation locus of the second positioning hole 171. Note that 20 is a holding ring that serves to control the rotary plate 10.

Next, the operation of the apparatus of this embodiment having the above configuration will be explained. When the steering wheel 2 is rotated to the left (in the direction of the arrow in FIG. 2), the rotor 6 is accordingly rotated to the left and the protrusion 10a of the rotating plate 10 is rotated by the right side surface 6C of the recess 6h of the rotor 6. is pressed, and the rotating plate 10 is also rotated to the left. In this case, with the right side surface 6C of the fourth part 6b and the protrusion 10a in contact with each other, the plurality of notches 9 and the first through holes 71 are configured to correspond one-to-one, so that the steering When the wheel 2 is rotated clockwise, a detection pulse is output from the photoelectric switch 1ε3 when each notch 0 and each first through hole 11 both cross the optical axis of the first photoelectric switch 18. and,
As can be understood from FIG. 2, when the steering wheel 2 is rotated to the left in the left rotation state of the steering wheel 2, the second positioning hole 14 (this positioning hole 14 is 2) and the first through hole 11 on the outside thereof correspond to the second photoelectric switch 19 and m, respectively.
Since the optical axes of the charging switches 18 of 1 are simultaneously crossed, detection pulses are emitted from both the first and second photoelectric switches 18 and 19. After this, steering wheel 2
When the rotor 6 is rotated clockwise from the left-handed state, the rotor 6 is accordingly rotated clockwise, while the rotating plate 1o is rotated in the recess 6b.
Until the left side surface 6d of the rotor 6 comes into contact with the protrusion 10 (in other words, until the rotor 6 is rotated by a certain amount), the rotor 6 is held stationary by the frictional force with the leaf spring 16 and then rotated clockwise. In this case, the first
The bit between the through hole 11 and the second through hole 12 is configured to be shifted by the above dimension, so that when the steering wheel 2 is rotated clockwise, the second through hole 7L12 corresponds to the notch 9. JruJ: I'm going to grow up. Therefore, when the steering wheel 2 is rotated clockwise, each notch 9 and each second
A detection pulse is output from the photoelectric switch 19 every time the through holes 12 of the photoelectric switch 19 are aligned and transverse the optical axis of the second photoelectric switch 19. In such a clockwise rotation state of the steering wheel 2, when the steering wheel 2 is rotated from 2]-1 to the ral position J, the first positioning hole 13 (this first positioning hole 13 ) and the second through hole 12 inside thereof correspond to the first photoelectric switch 18 and the second photoelectric switch 1, respectively.
9 simultaneously, detection pulses are output from both the first and second photoelectric switches 18 and 19.

Note that the rotary plate 10 is held in an open state until the Lj-taro is rotated by a certain amount when the steering wheel 2 is reversed from a clockwise rotation state to a counterclockwise rotation state.

For example, in Figure 3 (△), the steering wheel 2 is at the neutral position ■.

When the photoelectric switches 18 and 1 are rotated clockwise from to point T1 and then rotated counterclockwise after this point 1
The output state of the detection pulse from 9 is also shown in Figure 3 (B).
In this example, each photoelectric switch 18 and the steering wheel 2 are rotated counterclockwise from the point 1°' when the steering wheel 2 is in the neutral position to l+,'f point T's, and then rotated clockwise after this point -I''1. Each output state of the detection pulse from No. 19 is shown in () for reference.
>, in (B), ]-2, T'2 indicates the time point when the steering wheel 2 passes through the neutral position.

In summary, according to this embodiment, the direction of rotation of the steering wheel 2 can be detected depending on which of the photoelectric switch 18 and the second photoelectric switch 19 outputs a detection pulse, and the direction of rotation of the steering wheel 2 can be detected depending on the number of detection pulses. The rotation angle of the wheel 2 can be detected, and it can also be detected whether the steering wheel 2 is in the neutral position based on the state in which detection pulses are output from both the photoelectric switches 18 and 19.

FIG. 4 shows an example of a processing circuit for output signals from the apparatus having the above configuration, and FIG. 5 shows signal waveforms of various parts in such a processing circuit, which will be explained below.

In FIG. 4, 21 is a buffer amplifier that receives the output of the first photoelectric switch 18, and 22 is this buffer amplifier 2.
1 (output from the collector of the transistor 21a)], 23 is a buffer amplifier that receives the output of the second photoelectric switch 19, and 24 is the output from this buffer amplifier 23 (the output from the transistor 23a). This is an inverter that inverts the output from the collector.Furthermore, 25 is a clock terminal GK.

Reset terminal [(, rising trigger type up/down counter equipped with up/down switching terminal U/D and output terminals 01 to Q1, 26 to 29 are also rising trigger type and set input priority type R-S A flip-flop, 20 is a delay circuit, 31 to 33 are AND circuits, and 34 to 39 are OR circuits.Furthermore, 40G; Turn reflex 1 does not indicate that wheel 2 is being rotated counterclockwise.
~ Output terminal of signal SL, 42 is steering wheel 2
Indicates that the is being rotated clockwise - turn lie 1 ~ signal SR
The output terminal 43+-□43□ indicates the rotation angle of the steering wheel 2, and is the output terminal of the angle quantity IΩ SA.

However, there is only one town like this! The operation of the circuit is roughly as follows. That is, in FIG. 5, the steering wheel 2 is rotated to the left from time To when it is in the neutral position to time T2, then rotated to the right from time T2 to time T6, and then rotated to the left after this time T6. Points a to h in FIG. 4 and the output terminal 40.
41.42°431 and '432.433 signal waveforms are shown. At time To when the steering wheel 2 is in the neutral position, each phototransistor 18 in the first photoelectric switch 18 and the second photoelectric switch 19
b and 19b are turned on and transistors 1 to 21a and 23
a is turned on and the collector potentials of these drop to the ground level, resulting in a corresponding to the output terminals of the inverters 22 and 24.

A high level signal is output at both points. For this reason, AN
A neutral signal SN consisting of a high level signal is output from the D circuit 31 and the output terminal 40.
When the steering wheel 2 is in the 21-1 position as shown in FIG. 9. After this, when the steering wheel 2 is rotated to the left, only the first photoelectric switch 18 outputs a detection pulse as shown in the previous example. In other words, only the phototransistor 18b is turned on and off. At time T1, photo1 to transistor 19b are held in the OFF state, and at time T1
When the phototransistor 18b is turned on again at , the output at point a is again inverted to a high level signal, and at this time T1, the output at point b is maintained at low level 63''3.For this reason, AND circuit 31 and output pi1 child 4
At the same time, the output of the neutral signal @SN from point A is stopped, and the R-S flip-flop 26 is connected to the high level signal from point a as J:, and the output terminals Q
In turn, a turn reflex signal SL consisting of a high level signal is outputted from the output 9'ai-'f-41. At the same time, the signal SL sends R-, S to the turn reflex 1.
The flip-flop 28 is turned on and a high level signal is output to both points c and e, and the high level signal from the 0 point is switched up/down via the OR circuit 39.
The up/down counter 25 received by the at child U/D is switched to the up/down 1~state. Therefore, the up/down counter 25 performs an OR operation from point a to its clock terminal GK.
The count-up is started in synchronization with the rise of the high-level signal (signal at point h) inputted through the circuit 3/'4 and the delay circuit 3o, and the steering wheel 2 is rotated counterclockwise to perform such count-up operation. is repeated during the specified period, and the angular amount signal S^ corresponding to the result is sent to the output terminals 01 to QTl, and furthermore to the output terminals 431 to 431.
Output from 43Tl. -h, when the steering wheel 2 is reversed to the clockwise rotation state at time T2, only the second photoelectric switch 19 outputs a detection pulse;
In other words, when only the transistor 19b is turned on and off, the phototransistor 18b is kept in the off state, and at the subsequent time point 1-3, when the phototransistor 191) is turned on, b The output at point is now inverted to a high level signal, and at this point 1-3, a
The output of the point is held at a low level signal. Therefore, the state in which the output of the echo 1 to ral signals SN is stopped continues, and the R-S flip-flop 26 is reset to 1 by the high level signal from point b, and the turn left signal S
The output of L is stopped, and the output of R-8 flip-flop 2 is stopped.
7 is set by the high level signal from point b, and the turn right signal SR consisting of the high level signal @J: is outputted from the hit output terminal Q and hence the output terminal 42.

Therefore, the output of the AND circuit 32, that is, the output at point e, is inverted to a low level signal, and at this time, the turn line 1-
The signal SR is input to the set input terminal S of the R-S flip-flop 29, and the R-S flip-flop 29 inputs the R-S flip-flop 1 to the reset input terminal R.
Since the high level signal from 28 is input, the reset state is maintained. Therefore, the output of the AND circuit 33, that is, the output of one point, is also held at a low level signal, and as a result, the up/down switching terminal U/ of the up/down counter 25
A 1-level signal is input to D, and this is converted to the count 1 to state by 12J.

Therefore, every time a high level signal is output to point b in response to clockwise rotation of the steering wheel 2, the up/down counter 25 receives the high level signal via the OR circuit 34 and the delay circuit 30 to the clock terminal GK and counts down. The angle amount signals S from the output terminals 01 to Q□ are sequentially decreased. Then, when the clockwise rotation of the 7-ring wheel 2 continues and it reaches the 21-tral position at time T4, 8N +) circuit 31 as before.
When the neutralization signal DSN is outputted from the neutral signal Q3N, and the up/down counter 25 is reset by the rising edge of the neutral signal Q3N, the R-S flip-flops 27 and 28, which had been in the set state until then, are also reset (R
-S flip-flop 26 and two (already in reset state). Therefore, 2]-1-ral beliefll'3
When SN is output, the angle b'1 signal SA is always zero. After this, when the steering wheel 2 is further rotated to the right, the output at point b is again inverted to a high level signal at time T5, and the output at point a is maintained at a low level signal at time T5. Therefore, 21-1~ral signal SN
When the output of 1- is stopped, the R-S flip-flop 27 is turned on and the turn right signal SR is outputted again. At the same time, the R-S flip-flop 29 is turned on by the signal SR to the turn line 1, and high level signals are output to both points d and f, and the up/down counter 25 is activated by the high level signal from one point. Switched to up count state. Therefore, the up/down counter 25 starts counting up in response to the output of a high level signal at point 1) as the steering wheel 2 rotates clockwise, causing the angle amount signal SAG from the output terminals 01 to QTI to gradually increase. .

Thereafter, at time T6, the steering wheel 2 is reversed again to the counterclockwise rotation state, and when a high level signal is output to point a at time Ty after I'', the R-8 flip-flop 27 is reset to 1. Turnrai 1-Signal S
R has stopped outputting! - When the signal is pressed, the flip-flop 26 is turned on and the turn left signal SL is output. Therefore, the output of the AND circuit 33, that is, the output of one point, is inverted to a low level signal, and at this time, the turn left signal SL is input to the C input terminal S of the R-S flip-flop 28, but the IRS The flip-flop 28 has an R-S input terminal R to its reset (to
Since the high level signal from the flip-flop 29 is input, the state is held in the reset 1 state.

Therefore, as a result, the outputs of points e and 1 are both held at low level signals, and the up/down counter 25 is switched to the down count 1 state, and the up/down counter 25 is switched to the down count 2 state.
5 is 1!1' for the left rotation of the steering wheel 2.
+: When a high level signal is output to a, the angle tα
The product signal is gradually decreased to S8. From now on, depending on the rotation status of the steno ring wheel 2,
, LJJ Coco -1 -Ral signal SN 'Turn reflex i -Shin -turned ES L + turn signal SR and angle quantity SR are selectively output.

In FIG. 5, [τ, 1 indicates the delay time of the Takunobu circuit 30, and similarly, the value at the bottom indicates the value obtained by converting the angular quantity signal SA into a decimal number. ]-toral signal SN
and angular quantity signal SA, for example (by changing the damping force of a stain absorber, the rolling of a car when traveling on a curve is suppressed) to improve steering stability and riding comfort. It is also possible to obtain 0 by canceling the turn signal switch, for example, based on the turn left signal SLI turn right 1 to signal SR, and 8 signals @Ss, St, SR,
It is possible to use S^ to control various operations of a car.

In the above embodiment, the flange portion 8 is provided with a notch 9 as a pulse forming portion, but instead of this, the flange portion 8 may be formed of transparent 4II material, and such a flange portion 8 may be formed. A Nijakoze 1 substance is formed into a predetermined pattern by printing or other means, and the non-formed part of the pattern applied to the flange part 8 is made into a translucent pulse forming part. It may also be used as a configuration. Further, in the above embodiment, the first photoelectric switch 18 and the second photoelectric switch 19 as the first and second sensors were constructed as light-transmitting type, but the first and second sensors 1'' It is also possible to form the photoelectric switch with a nine-way type photoelectric switch, and in this case, the configuration described below may be used. That is, a light reflecting section serving as a pulse forming section is provided in the rotor 6 with the notch 9 of the flange section 8 filled in the rotor 6, and the entire rotary plate 10 is placed in a state where light reflection is reduced. forming the arm 17b
The structure is such that first and second light-reflecting photoelectric switches are installed in the switch.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be applied not only to the detection of the rotation of a steering wheel of an automobile but also to the detection of rotation of other materials. The invention may be modified and implemented as appropriate without departing from the above.

(Invention Glue” Song Dynasty) The present invention (J Twins 1: Yu 2 Ming,
Only two sensors, the first and second sensors, are used. A certain state can be detected 41,
Moreover, it is possible to make the pulse signal generation circuit using two sensors contactless, which improves durability and reliability. This eliminates the possibility of noise generation.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal side view of the whole, Fig. 2 is a plan view of the main part, Fig. 3 is a time chart showing signal generation timing, and Fig. 3 is a time chart showing signal generation timing. FIG. 4 is a signal processing circuit diagram, and FIG. 5 is a time chart 1--1 to 'C showing waveforms of various parts in FIG. In the figure, 1 is a steering wheel (rotating member), 6 is a rotor, 9 is missing a beam (pulse forming part), 10 is a rotating plate, 1
1 is a first through hole (first auxiliary pulse forming part), 12f;
L second through hole (second auxiliary pulse forming part), 13 is the first
positioning hole (first position detection pulse forming part), 14
is the second positioning hole (second position detection pulse forming part)
, 1B is the 10th photoelectric switch (first sensor 4j-), 1
9 indicates the second photoelectric switch (second sensor → J) J0 Applicant Toyota Motor Corporation stock trial Tokai Rika Denki Seisakusho (:・,', jl-:, i, ρ Agent Patent attorney Tsuyoshi Sato t!I-′-翰), ;i,
, Figure 1 Figure 2 M Continuation of page 1 @ Inventor Kazumi Kono @ Inventor Hibino -Nari Tokai Rika Denki Seisakusho Co., Ltd., 1 Noda, Oaza Toyota, Oguchi-cho, Niwa-gun, Aichi Prefecture

Claims (1)

[Claims] 1. A rotor that rotates integrally with the rotating member, a plurality of pulse forming units that are dotted on the rotor at a constant pitch along its rotation locus, and A rotary plate is connected to the pulse generator so as to have a predetermined margin in the direction of rotation thereof, and on this rotary plate, there are two rows of people dotted at a constant pitch on the rotation locus of the pulse forming section, and each other. The pitch between the first and second auxiliary pulse forming portions is increased by the amount of free space of the rotating plate of the whole rotor.
and a first auxiliary pulse forming section that is provided corresponding to the second auxiliary pulse forming section and generates a pulsed signal every time the corresponding auxiliary pulse forming section and the pulse forming section are aligned and facing each other. and a second pulse generator, and (
When the rotary member is in a predetermined position, the pulse forming portion is opposed to each other within the margin of the rotary plate, and the first and second sensors both generate a pulse-like signal. A rotation detecting device u0 of a rotating portion i Δ, characterized by comprising first and second position detecting pulse forming portions acting on the