JPS58176552A - Detector for measuring number of revolution of rotating body - Google Patents

Abstract

PURPOSE:To detect the number of revolution of a rotating body surely by providing a part for absorbing light and a part for reflecting the same alternately on said body, and providing a detection part disposed with photodetector concentrically around a light emitting element. CONSTITUTION:Reflecting materials 1 are adhered at a specified interval to a rotating body A having no reflectivity and photodetector 3 are disposed concentrically around a light emitting element 2 so as to face oppositely to the reflection material. The light emitting from the element 2 is reflected by the material A and is detected with the photodetector 3. The number of revolution is detected with the photodetector, and further the direction where the body A causes a change in angle is measured in responding that which detector 3 detects the reflected light. The number of revolution is thus detected surely even if the body A causes oscillation, strain, uneven rotation, inclination, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an improved device for measuring and detecting the rotational speed of a rotating body, and its purpose is to detect constant detection of the rotating body due to vibration, distortion, two-turn unevenness, or inclination. It has been improved so that it can reliably detect the rotational speed even if it cannot be obtained.

Hereinafter, referring to the drawings, A is a rotating body and K is a rotating body that does not reflect light. Reflective objects 1 are pasted at regular intervals. B is the rotation speed measurement detection section with a light emitting element (light source) 2 in the center.
is provided, and the light receiving elements 3 are provided concentrically around this. Figure 91 shows the case where the rotating body A is parallel to the substrate, and the light emitting element 2
The emitted light is reflected by the reflector 1, enters the photodetector 3, and is sensed. Figures 2 and 3 show a state in which when the rotating body is tilted and the angle changes, light is detected only by the light receiving element 2, and the light is received on a concentric circle around the light emitting element 2. By arranging the elements 3 and measuring the number of revolutions of the rotating body A, it is possible to determine in which direction the rotating body has angularly shifted based on which light-receiving element 3 has sensed it. As a method, the light-emitting element 2 is arranged in four directions, for example, with the light-receiving element 3 as the center.
When two light emitting elements are provided, the angle change can be determined by sequentially shifting the light emitting period of the light emitting elements 2 and separating the frequencies by a bandpass filter Fs=Fa.

Next, Figure 94 shows a specific example for using the above device, where C is the body, 4 is the display window, 5 is the pilot lamp, and 6 is the device body.
is a start switch, 7 is a detection section, 811t mode switch, and S is a display window.

Next, Figure 5 shows the distance of a car from 0 to 400m or from 0 to 1100m.
This shows the case of lap time measurement of K/l (Fig. 5), which uses 10~27 electrical parts to achieve the function. In the figure, 10 is the basic clock generation. The frequency divider circuit, together with the crystal oscillator 11, oscillates an extremely accurate time period.These 10 basic clock generation frequency divider circuits generate a 17100 second clock, which provides the precision required for lap time measurement. O~1100K/
Pulse signal t-t with a period of 0.36 m1 to check whether the speed reaches 1100 K/HK in H mode.
'tt is occurring.

Reference numeral 12 denotes a gate circuit, which serves as a lap time counting circuit and a display driving circuit only when a pulse signal having a period of 1/100 seconds generated by the basic clock generation frequency dividing circuit 10 is measured using a control signal from the timing circuit 21. It controls the transmission to 13.

The rack time counting and display driving circuit No. 13 is composed of a 4-digit lO base counting circuit and a driving circuit for driving the numeric display device 22.

1411t Tire - This is a pulse generation circuit that corresponds to the distance of the circumference, and generates the number of pulses corresponding to the outer circumference of the tire set by the digital switch (for example, 20G pulse when the outer circumference of the tire is 200 cm). , which is configured to operate only once when the tire rotates once according to the input from the tire rotation detection sensor.

Additionally, 15 zero detection circuits are included in the pulse generation circuit corresponding to 14 tire-circumference distances. This is a circuit that detects zero in the counting circuit, and this zero detection circuit 15 has a time period of 0.36 m generated by the basic clock generation divider circuit 10.
The ninth indispensable step is to check whether the vehicle speed of the measuring vehicle has reached xoo Km/H based on the pulses generated by the pulse generation circuit for determination in the 18 O to Zoo Km/H mode. It is a constituent element. This 0~tooK
The detection principle of m/H mode will be described later.

Mileage counting circuit and 40000 ts reaching detection circuit 1
6 consists of a counting circuit that integrates and counts the pulses generated in the pulse generating circuit corresponding to the number of 14 tire-to-station distances, and a circuit that detects whether the number has reached 40000511. is sent to the timing circuit 21. By inputting this timing circuit 21Fi mode switch 24, this mode switch 24 changes the time period of the clock of the pulse signal sent from the basic clock generation divider circuit 1 to the pulse generation circuit 14 corresponding to the distance of the tire circumference. /H When the lap time measurement mode is set, the time period of the clock to be sent is 0.36 ms, or an integral multiple or fraction thereof, or an approximate value thereof is generated and sent. This mode switch 2
When 4 is in the 0-400m lap time measurement mode trap, the pulses with a short time period of 0.36 m are selected and sent.

When this mode switch 24 is in 0~xooKm/H lap time measurement mode, O~100Km/H
Judgment pulse generation circuit 18 in lap time measurement mode
Based on the pulses output from the zero detection circuit 15 and the output from the zero detection circuit 15, it is determined whether 100 Km/H&C has been reached, and the time counting gate circuit 13 is controlled. Also, when this mode switch 24 is in the 0-400m lap time measurement mode, the mileage counting circuit input to this timing circuit 21 and the 40000. In response to the signal from the aI reaching detection circuit 16, the time counting gate circuit 12t-controls. Also, start switch 24
When m is input, the lap time counting circuit 13 . Pulse generating circuit 14 corresponding to the number of tire-circumference distances. and mileage counting circuit 16
All the counting circuits in the time counting gate circuit 12 are reset and the gates of the time counting gate circuit 12 are prepared for counting. The pulse generated by the determination pulse generation circuit 18 in the 0 to xooKm/H9 time measurement mode is sent to the timing circuit 21, and the gate circuit 12 is activated by this pulse. That is, after the start switch 24m is input, when the tire begins to rotate and the first reflection detection (rotation detection) is confirmed, the gate circuit 12 is opened and time measurement is performed.

In the photoelectric switch for tire rotation detection, the pulses generated by the light emitter oscillator and drive circuit 13 are power amplified by the drive circuit, and the pulses are amplified by the drive circuit and a plurality of light emitting diodes etc.
,...26 lights are driven and emit light as light energy.

Further, 25 is an optical sensor), and the weak electrical signal received by the optical sensor 2s and converted into an electrical signal is sent to the input signal amplification and waveform shaping 19, where it is reflected by a reflector on the tire. The light that passes through this circuit appears as a pulse signal. The tire rotation pulse obtained here is sent to the judgment pulse generation circuit 11 in the 0=100Km/H lap time measurement mode, and its output is further input to the distance pulse generation command pulse generation circuit 1T, which generates the distance pulse. The pulses generated by the command pulse generation circuit 17 are sent to the pulse generation circuits 14 corresponding to the number of distances around the tire, and pulses corresponding to the distance between the tires and the circumference are generated.

Next, Figure 6 shows the detection of the speed of a car too Km/H. When a tortoise with wheels moves, the diameter R of the wheel is given, and the wheel rotates once. It is well known that the vehicle speed V can be measured by measuring the time period K.

When converting too Km/H to speed per second, it becomes like a fist...(
1) The above constant is for 1 second at a speed of 100 Km/H! 77
It means moving at a speed of 77 am.

Calculating the time required for the above formula 111 to travel a distance of fi1m+, we get: ・ ・ ・ ・ ・ (2) This formula 121 is moving at a speed of 1oo Km/h5
time, the time required to travel a distance of 1 am is 0.000
It shows that it is 36 seconds.

Attachment 6 shows a configuration that utilizes the above relationship to detect a vehicle speed of 10 Km/H, and its temporal timing chart is shown in the attached sheet.

In Fig. 6 for 100 Km/H detection, the outer circumference of the tire is set using the digital switch 28 (for example, 2385I).
is set, and the pulse generated by the distance pulse generation command pulse generation circuit 32 is a pulse that presets the data of the digital switch 28 to the data preset type subtraction counting circuit 28. After the preset operation is completed, the preset pulse is input to the data preset type subtraction counting circuit.
Subtraction counting is performed using clock pulses with a special cycle of 36 ms. Then, the count contents of the subtraction counting circuit 2s are inputted to the zero detection circuit 30, and it is checked whether the subtraction counting circuit 29 has become zero. Then, the output of the zero detection circuit 30 is O~too Km/Hm
-The determination circuit 33 determines whether 100 Km/HK has been reached in conjunction with the output pulse from the H mode pulse generation circuit 31, resets the start holding circuit 34, closes the lap time counting gate circuit, and It is configured to end time measurement.

PK in the 1100K/H detection timing chart
is a tire rotation pulse, which is obtained by passing the rotation of the tire through a necessary electronic circuit using a photoelectric switch, etc., and shaping the waveform. And n PI is a pulse generated by the PI to a circuit such as a monostable multivibrator 69, and this pulse is a pulse created to judge whether the speed has reached loo Km/H or more. be. PI is a data preset signal to the data preset type subtraction counting circuit 28, which is generated by a monostable multivibrator. After presetting the data preset type subtraction counting circuit 2 @ with data set at Pl,
Subtraction counting is started at the 0.36 mm clock pulse of P4. In the explanatory diagram of Fig. 7, when tl is calculated using the above-mentioned calculation method, that is, 1oo Km/H, it takes KO,36ms to advance lam, so (#setting data) X O,36(ml ) =t @
* @ @ @ (31.tFi 100 per hour
The speed UK in Km/H means the time required for the tire to rotate once when the outer circumference is the set data. In other words, when the time for one rotation of the tire is longer than t, too
When the speed is less than Km/H and equal to t, too
If the stains are caused by driving at 4m/h,
This means that the speed is over too Km/H. That is, in the above state, if the data preset type subtraction counting circuit 2 is at zero at the time of the judgment pulse pm, the speed is 1/hr.
If the speed is less than 0 GKm/H, or the same timing is not zero, it means that the vehicle is traveling at a Q speed of more than 0 GKm/H. The zero detection output on the timing chart is written so that the output is output when it is zero.

As described above, a determination pulse Ps is provided to detect the speed of lOffKm/H, a preset signal Ps that does not overlap with that Pm is generated, and a special difference lock F= of 0.36 ms is used to detect the speed. can be determined. Also, if this method is used, 100K m/H
In addition, various speeds can be easily detected by calculating the clock P4. Also, if the outer circumference of the data setting digital switch is set to a value twice the actual outer circumference, a speed of 50 Km/H can be easily detected. Also, by using the same method, that is, by setting a double value, the entire lap time from 0 to 200 m can be easily measured.

[Brief explanation of the drawing]

Drawing Box 1, Figure 9 to Figure 3 are explanatory diagrams of the relationship between the rotating body and the rotational speed measuring and detecting section, Figure 4 is a perspective view of the instrument, and Figure 5. FIG. 6 shows a wiring diagram, and FIG. 7 shows an explanatory diagram. A...Rotating body B...Rotation speed measurement detection section C1/apparatus Patent applicant Ike 1) Yasuo

Claims (1)

[Claims] Ex) A reflective light type in which a rotating body is provided with light absorbing parts and reflective parts alternately at equal intervals, and the detecting part has light receiving elements arranged concentrically around a light emitting element. Or, conversely, if the light-emitting element is placed on a concentric circle around the light-receiving element, the rotating body vibrates. A rotational speed measuring and detecting device for a rotating body, characterized in that it can be used for periodic inspection to measure the rotational speed of a rotating body even when the rotating body is strained or tilted.゛(2) A reflective light type in which a rotating body is provided with light absorption parts and reflection parts alternately spaced apart, and ゛A light receiving element is provided in a concentric circle around the light emitting element in the detection part, or Or conversely, the light-emitting elements are placed on a concentric circle around the light-receiving element, and the rotating body vibrates. This device is capable of measuring and detecting the rotational speed of a rotating body even in the case of distortion or inclination. Count display drive circuit, tire
Circumference distance pulse generation circuit, cello detection circuit, θ~110
Pulse circuit for judgment in 0K/H mode. Combining distance pulse generation command circuit, necessary signals, amplification waveform shaping electrical parts, 0 to 400 m1 or O to 10
A device for measuring and detecting the number of rotating bodies that has a structure that allows constant 0 Km/H lap time m1. (3) A reflective light type in which a rotating body is provided with light absorption parts and light reflection parts alternately at equal intervals, and the detection part is provided with a light receiving element in a concentric circle with the light emitting element in the center, or vice versa. A rotational speed measuring and detecting device for a rotating body, characterized in that a light-emitting element is provided on a concentric circle around a light-receiving element, and the rotational speed of the rotating body can be measured and detected even when the rotating body is vibrated, strained, or tilted. And a digital switch, a data preset type subtraction counting circuit, -1! 'B detection circuit,
It has a configuration that can detect speeds of 100 Km/H by combining electric components such as a pulse generation circuit for 0" to 1100 K/H, a distance pulse generation command pulse generation circuit 1 judgment circuit, and a start holding circuit. Rotating body rotation speed measurement detection device.