JPH06199263A - Measuring device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a measuring device capable of accurately detecting the start of rotation of a measurement target and performing measurement. [Structure] Different spokes 3 of the front wheel 2 are provided with a first magnet 4 having a strong magnetic force and a second magnet 2 having a weaker magnetic force than the first magnet 4.
4 and 4 are mounted on the same rotary orbit. A transmitter 9 is fixed to the vehicle body outside the rotational orbits of both magnets 4, and the transmitter 9 detects the magnetism of the magnets 4 and 5 and transmits different pulse signals depending on the strength of the magnetism. A receiver 11 is mounted above the transmitter 9. When the front wheel 2 rotates in the direction of arrow R when the bicycle 1 moves forward, the first magnet 4 and the second magnet 5 pass through the inside of the transmitter 9 in this order, and the transmitter 9 responds to strong magnetism. The pulse signals are output in the order of the high voltage pulse → the low voltage pulse corresponding to the weak magnetism, and by receiving the pulse signals in this order, it is detected that the front wheel 2 has rotated in the arrow R direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device for measuring the number of revolutions of a bicycle wheel or the like.

[0002]

2. Description of the Related Art As a conventional measuring device, a device called a cycle computer is known. This cycle computer is composed of keys for inputting the circumference of a bicycle wheel and a target speed, a rotation detection device for detecting the rotation of the wheel, and the like. This rotation detection device includes a magnet mounted on a spoke of a front wheel, a magnetic detection unit fixed to a vehicle body side and located outside a rotation track of the magnet, and a transmitter for wirelessly transmitting a magnetic detection signal from the magnetic detection unit. , And a receiver or the like that receives a signal from this transmitter.

Then, as the bicycle rotates, the front wheels rotate, and when the magnets attached to the spokes pass through the inside of the magnetism detecting portion, the magnetism detecting portion detects the magnetism and the transmitter detects the magnetism. The pulse signal is wirelessly transmitted in synchronization with. Then, the receiver receives the pulse signal, detects the start of the bicycle, counts the passage of the magnet thereafter, calculates the integrated distance by the "total count number x circumference", and "3600 / count cycle x The speed (hour speed) is calculated by "circumference", and the calculated integrated distance and speed are displayed on the display unit provided on the receiver side.

[0004]

As described above, in the conventional cycle computer, it is considered that the bicycle has started running when the pulse signal transmitted from the transmitter side is received by the receiver. Then, the passage of the magnet is counted thereafter. However, for example, by vibrating the vehicle body back and forth before starting traveling, the wheels slightly rotate in the front-rear direction without making one rotation, and the magnets move in the same direction. Then, the magnet may reciprocate inside the magnetic detection unit to detect magnetism, and a plurality of pulse signals may be output even before traveling is started. As a result, the number of counts increases even if the vehicle has not started traveling, and an error occurs in the integrated distance, and the speed is displayed.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a measuring device capable of accurately detecting the start of rotation of a measurement target and performing measurement. It is a thing.

[0006]

In order to solve the above-mentioned problems, the present invention provides a signal output means for outputting at least two kinds of signals at different timings according to the rotation of a measuring object, and the signal output means. The detection means for detecting the start of rotation of the measurement target in a predetermined direction based on the signal output from the detection means, and the signal output after the start of rotation of the measurement target in the predetermined direction is detected by the detection means. And a measurement processing unit that executes a predetermined measurement process based on a signal from the unit.

[0007]

In the above structure, when two kinds of signals are output from the signal output means along with the rotation of the measuring object, the detecting means rotates the measuring object in a predetermined direction based on the two kinds of output signals. To detect. That is, for example, if one signal is output first and the other signal is output next is the predetermined rotation direction, if both signals are output in this order, rotation in the predetermined direction is possible. Yes, and in the opposite case, it can be regarded as reverse rotation. Therefore, by outputting the signals in the above order, the detection unit detects that the measurement target has started to rotate in the predetermined rotation direction. Then, when the detection means detects the start of rotation of the measurement target in the predetermined direction, thereafter, the measurement processing means executes the measurement processing based on the signal output from the signal processing means.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. That is, FIG. 1 is a side view of a bicycle to which the first embodiment of the present invention is applied, in which spokes 3 of different front wheels 2 provided on the bicycle 1 are separated from each other by an appropriate interval in the rotation direction. The strong first magnet 4 and the second magnet 24 having a weaker magnetic force than the first magnet 4 are mounted on the same rotation path. On the other hand, a transmitter 9 is fixed to the outside of the orbits of the magnets 4 on the hawk-frame 8 of the bicycle 1, and the transmitter 9 has a detector for detecting the magnetism of the magnets 4 and 5. A transmission unit or the like that transmits different pulse signals according to the strength of the detected magnetism each time the magnetism is detected is provided.

A receiver 11 is mounted on the handle portion 10 of the bicycle 1 above the transmitter 9. The receiver 1
1 has an outer case 12 as shown in FIG. 2, and a key group 13 and a liquid crystal display 14 are provided on the upper surface of the outer case 12. It should be noted that the liquid crystal display 14 has a current time, a traveling start time, and a running start time depending on a mode set by operating a key provided in the key group 13.
The traveling end time, traveling total time, traveling distance, traveling speed, average speed, maximum speed, etc. are displayed.

FIG. 3 is a block circuit diagram showing the internal structure of the receiver 11. The wheel speed sensor 15 receives the pulse signal transmitted from the transmitter 9 and sends the signal to the microcomputer 16. . Further, a power supply circuit 18 is connected to the microcomputer 16 and a key input unit 1 for inputting operation information of the key group 13
7, alarm circuit 19, crystal oscillator circuit 20, pulse meter 2
1. The cadence detection sensor 22 is connected. Then, the microcomputer 16 uses the wheel rotation speed sensor 1
5, the necessary arithmetic processing is performed based on the information stored in the ROM and the information from the key input unit 17, etc.
The entire receiver 11 is controlled together with the liquid crystal display 14. The microcomputer 16 also has a stopwatch function for timing the running time.

RAM 1 of the microcomputer 16
6A is provided with a register group having the format shown in FIG. That is, the current time register a stores the current time based on the clock output from the oscillation circuit 20, and the tire size register b stores the tire size of the front wheel 2 previously input by operating one of the keys of the key group 13. Is memorized. The traveling alarm speed register c, the pulse alarm number register d, and the traveling alarm distance register e store the speed, distance and pulse for operating the alarm circuit 19, and the lap data register f stores three sets of lap distance and lap time. And are remembered. The running data register g stores running time, running distance, maximum speed, and average speed, and the exercise score X register h stores a value indicating the amount of exercise.

Next, the operation of this embodiment having the above configuration will be described with reference to the flow chart shown in FIG. That is, the receiver 11 starts the operation according to this flowchart by operating the power switch provided in the key group 13, and first, the received signal processing (S
Execute 1). By this received signal processing, one of the front wheels 2
Two types of pulse signals transmitted from the transmitter 9 for each rotation are received by the receiver 11 side.

Next, a signal level detection process (S2) is executed to detect the rotation direction of the front wheel 2 based on the two types of pulse signals received in S1. That is, in order for the bicycle 1 to move forward, the front wheels 2 need to rotate in the arrow R direction as shown in FIG. When the front wheel 2 normally rotates in the direction of arrow R, the first magnet 4 and the second magnet 5 pass through the inside of the transmitter 9 in this order. Therefore, pulse signals are output from the transmitter 9 in the order of high voltage pulse corresponding to strong magnetism → low voltage pulse corresponding to weak magnetism, and by receiving the pulse signals in this order, the front wheel 2 causes the arrow R to move. It is possible to detect the rotation in the direction.

When the front wheels 2 rotate in the opposite direction or reciprocally rotate, for example, by vibrating the vehicle body back and forth before starting traveling, the first magnet 4 or the second magnet 4 is placed inside the transmitter 9.
Only the magnet 5 reciprocates, or the second magnet 5 → the first magnet 4
There is a possibility of passing in the order of. In such a case, only one type of pulse signal is continuously received, or in the reverse order to the above. Therefore, it is possible to detect whether or not the front wheel 2 appropriately rotates in the R direction depending on whether or not the high voltage pulse is received in the order of the low voltage pulse described above.

Further, in S3 subsequent to S2, a count number process is executed to count the number of received high voltage pulses and low voltage pulses within a certain time period, and then the next count number judgment (S4). Then, it is determined whether the number of counts within this fixed time is larger or smaller than a predetermined value. That is, in the above-described signal level detection processing (S2), it is detected that the front wheels 2 have rotated in the rotation direction (R direction) required for traveling of the bicycle 1 based on the received two types of pulse signals, and this count number In the determination, it is determined whether or not the front wheels 2 are in the rotating state, that is, whether or not the bicycle 1 is in the traveling state, based on the number of pulses in a predetermined time.

As a result of the determination in S4, if the number of pulses received within a certain time is less than the predetermined value, even if the front wheel 2 is rotating in the R direction, the rotation is not continuous, Bicycle 1 is not running. Therefore, the stop process (S5) is performed, and the pre-stopwatch for starting the traveling from the start point and measuring the traveling time and other measuring functions are in the stopped state. Then, when the number of pulses received within a certain time exceeds a predetermined number, start processing is performed to start the stopwatch and other measurement functions, and the running time is measured by this, and the "total count number x circumference" is added. Calculate the distance, or use "3600
The speed is calculated by "/ count cycle x circumference". The start start time at this start time is stored in the start time register SZ in the RAM 16A.

After that, depending on the judgment result of S4, S4
When the bicycle 1 is temporarily stopped by repeating the loop of → S5 → S4 or the loop of S4 → S6 → S4 (S5). In addition,
The stop time at this stop time is similarly stored in the stop time register SS. When the vehicle starts traveling again, the measurement function starts (S6), so that the predetermined measurement is performed only when the vehicle is actually traveling. The measurement results are stored in the running data register g and the like in the RAM 16A, respectively, and various data based on the measurement results are also stored in the registers.

In this embodiment, the two magnets of the first and second magnets 4 and 5 are attached to the spokes 3, but by attaching a plurality of magnets having different magnetic forces to the spokes 3, the front wheel The detection accuracy of the rotation direction of 2 can be further improved.

FIG. 6 shows a second embodiment of the present invention. As shown in FIG. 6A, the front wheel magnets 23 are attached to the spokes 3 of the front wheel 2, and the front wheel is attached to the hawk phase 8. The front wheel side transmitter 24 is provided outside the rotation track of the side magnet 23.
Is fixed. On the other hand, as shown in (B), a pedal-side magnet 26 having a magnetic force different from that of the front-wheel-side magnet 23 is attached to the pedal 25, and the body frame 27 is provided inside the rotation path of the pedal-side magnet 26. The pedal side transmitter 28 is fixed.

In this embodiment, when the pedal 25 is rotated, the pedal-side magnet 26 passes outside the pedal-side transmitter 28 to detect magnetism, and the pedal-side transmitter 28 outputs a pulse signal. Further, the rear wheels are driven by the rotation of the pedal 25, and the front wheels 2 are driven as the rear wheels are driven.
When is rotated, the front wheel side magnet 23 passes inside the front wheel side transmitter 24 to detect magnetism, and the front wheel side transmitter 24 outputs a pulse signal.

At this time, when the pedal 25 is idled without traveling, the pulse signal is transmitted only from the pedal side transmitter 28, and the pulse signal is not output from the front wheel side transmitter 24. Further, when the air pressure of the front wheels 2 is checked, when the front wheels 2 are simply idled, the pulse signal is output only from the front wheel side transmitter 24, and the pulse signal is not output from the pedal side transmitter 28. Therefore, when pulse signals are output from both the pedal-side transmitter 28 and the front-wheel-side transmitter 24 at timings according to the gear ratio,
It can be determined that the running has started, and after the running is determined, the same measurement as in the first embodiment is performed.

[0022]

As described above, according to the present invention, at least two kinds of signals are output at different timings according to the rotation of the measuring object, and the rotation start of the measuring object in the predetermined direction is detected based on this signal, A predetermined measurement process is executed after this rotation start is detected. Therefore, the rotation start of the measurement target can be accurately detected and the measurement after the rotation start can be performed without being affected by the movement of the measurement target before the rotation start in the predetermined direction.

[Brief description of drawings]

FIG. 1 is a side view of a bicycle to which an embodiment of the present invention is applied.

FIG. 2 is a plan view of a receiver.

FIG. 3 is a block diagram showing a configuration of a receiver.

FIG. 4 is a diagram showing a register group provided in a RAM.

FIG. 5 is an operation flowchart of the present embodiment.

FIG. 6 is a diagram showing an arrangement state of a magnet and a transmitter according to another embodiment of the present invention.

[Explanation of symbols]

 1 Bicycle 2 Front Wheel 4 First Magnet 5 Second Magnet 9 Transmitter 11 Receiver 14 Liquid Crystal Display 15 Wheel Rotation Speed Sensor 16 Microcomputer 23 Front Wheel Side Magnet 24 Front Wheel Side Transmitter 25 Pedal Side Magnet 26 Pedal Side Transmitter

Claims (6)

[Claims] 1. A signal output means for outputting at least two kinds of signals at different timings according to the rotation of a measurement target, and a rotation of the measurement target in a predetermined direction based on the signal output from the signal output means. A detection means for detecting the start, and a measurement processing means for executing a predetermined measurement processing based on a signal from the signal output means after the rotation start of the measurement target in the predetermined direction is detected by the detection means, A measuring device having: 2. The signal output means includes two magnets having different magnetic forces and mounted at appropriate intervals in the rotation direction of the measurement target, and the two magnets arranged at a predetermined position. The measuring device according to claim 1, comprising an output device that senses a magnetic force and outputs the signal. 3. The measuring object is a wheel of a bicycle,
4. The two magnets are attached to the wheels, and the output device is attached to a bicycle body.
The measuring device described. 4. The signal output means outputs a first signal in synchronization with rotation of the measurement target, and a first signal output means in synchronization with rotation of a driving body that drives the measurement target. 2. The measuring device according to claim 1, further comprising a second signal output unit that outputs two signals. 5. The first and second output means are provided with magnets having different magnetic forces mounted on the measurement target and the driving body, respectively, and magnetic forces of the respective magnets arranged at predetermined positions. The measuring device according to claim 4, comprising an output device that senses and outputs the signal. 6. The measurement target is a bicycle wheel, the driving body is a bicycle pedal, the magnet is attached to the wheel and the pedal, and the output device is attached to the bicycle body. 6. The method according to claim 5, wherein
The measuring device described.