JPH09218069A - City water meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize accurate measurement of the quantity of used city water by preventing erroneous count at the time of transition from forward rotation to reverse rotation and from reverse rotation to forward rotation. SOLUTION: A forward/reverse decision section 4 detects the rotational direction of a rotator based on the output from a rotation sensor and delivers a rotational direction detection data to an accumulating section and a delay circuit 9. The delay circuit 9 delays the rotational direction detection data such that extra pulses, produced before formation of a first synthesized pulses, in the reversed rotational direction, are offset by upcount or downcount at the accumulating section. A delay data controls a switch 3 to feed a synthesized pulse during forward rotation or reverse rotation of the rotator. Consequently, counting can be started accurately from the first synthesized pulse formed after reversal of rotational direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rotation of a rotating body that rotates according to the amount of water used, such as a photoelectric rotation angle sensor or a semiconductor sensor (Hall element, Hall IC, magnetic resistance element, magnetic diode, etc.). The present invention relates to a water meter device that counts a number and measures the amount of water used based on the count value, and particularly to a water meter device that improves measurement accuracy and reduces power consumption.

[0002]

2. Description of the Related Art The main part of a conventional water meter device is as shown in FIG. 8, which detects the rotating state of a rotating body which rotates in accordance with the amount of water used and detects a phase difference of 90 degrees from each other. Magnetic sensor 100 that outputs first and second rotation detection pulses
And a sampling voltage drive unit 102 for driving the magnetic sensor 100 with a high frequency pulse, an integrated pulse for detecting the amount of water used, and a rotation direction of the rotating body, based on each rotation detection pulse from the magnetic sensor. And a forward / reverse determination & combined pulse output unit 101 which forms rotation direction detection data indicating

The forward / reverse determination & composite pulse output unit 101
Is an inverter 113, a NAND gate 114, an AND gate 115, an OR gate 116, A as shown in FIG.
A combined pulse output section composed of an ND gate 117, an inverter 118, D flip-flops 119 and 120, and a NOA gate 121, and a pair of so-called N-shaped cross-connects so that each output is supplied to the other input terminal.
It is composed of a forward / reverse determination section composed of AND gates 122 and 123.

In the water meter device having such a configuration, the two-phase rotation detection signals from the magnetic sensor are sampled by the high frequency sampling pulse from the sampling voltage driving unit 102, respectively, and the water meter is used in accordance with the amount of water used. A first rotation detection pulse as shown in FIG. 10A and a second rotation detection pulse as shown in FIG. 10B are formed.

Specifically, in the magnetic sensor 100, when the rotating body rotates in the forward direction (during forward rotation), the time t50 to the time t5 in FIGS. 10 (a) and 10 (b).
As shown in 4, the phase is 90 degrees more than that of the first rotation detection pulse.
The second rotation detection pulse is formed after a delay of
On the contrary, when the rotating body is rotating in the opposite direction,
As shown from time t57 to time t61 in FIGS. 10A and 10B, the second rotation detection pulse is formed with the phase advanced by 90 degrees from the first rotation detection pulse.

The first rotation detection pulse formed by the magnetic sensor 100 is input to each data of the D flip-flops 119 and 120 of the forward / reverse determination & combined pulse output section 101 via the input terminal 110 shown in FIG. The NAND gate 11 is supplied to the terminal (D terminal) and passes through the inverter 113.
4 and the OR gate 116. Further, the second rotation detection pulse is supplied to the clock input terminal (CK terminal) of the D flip-flop 119 via the input terminal 111, and D is supplied via the inverter 118.
It is supplied to the CK terminal of the flip-flop 120, and the N
It is supplied to the AND gate 115 and the OR gate 116. When the main power supply is turned on when the water meter device is activated, a control circuit (CPU) (not shown) detects this and a high-level power-on pulse is sent via the input terminal 112 to the AND gate 115. , 117 and the NAND gate 123 of the forward / reverse determination unit.

Inverter 113, NAND gate 1
14 and the AND gate 115 form a reset pulse of the D flip-flop 119 based on each rotation detection pulse, and supply this to the inverting reset terminal (/ R terminal) of the D flip-flop 119. Also, the above OR
The gate 116 and the AND gate 117 form a reset pulse of the D flip-flop 120 based on each of the rotation detection pulses, and the reset pulse is generated by the D flip-flop 12.
Supply to 0 / R terminal.

As a result, during this forward rotation, as shown at time t51 to time t52 in FIG. 10C, the data pulse which becomes high level while the respective rotation detection pulses are both high level is the D flip-flop. It is supplied to the NOR gate 121 via the data output terminal (Q terminal) of the amplifier 119. In addition, time t50 to time t in FIG.
A low level data pulse as shown at 54 is passed through the Q terminal of the D flip-flop 120 to the NOR gate 1
21. The NOR gate 121 outputs the high-level data pulse shown at time t51 to time t54 in FIG. 10C based on the data pulse supplied via the Q terminals of the D flip-flops 119 and 120. A composite pulse of each rotation detection pulse, which is at a low level during the output, as shown from time t50 to time t55 in FIG. 10 (f), is formed, and this is output as an integrated pulse for integrated counting. This integrated pulse is output to the output terminal 10
It is supplied to the integrating unit via 3.

On the other hand, the inverted data from the inverted output terminal (/ Q terminal) of the D flip-flop 119 is supplied to the NAND gate 123 of the forward / reverse determination section, and the inverted data from the / Q terminal of the D flip-flop 120 is obtained. It is supplied to the NAND gate 122 of the forward / reverse determination unit. At the time of this normal rotation, the normal / reverse determination unit determines that each NAND gate 12
2, based on the inversion data supplied to 2,123.
(E) The low level rotation direction detection data as shown from time t50 to time t54 is formed, and this is output to the output terminal 10
It is supplied to the above-mentioned integrating part via 4.

The integrating unit operates at time t5 in FIG. 10 (f).
2, the integrated pulse is counted at the rising edge of the integrated pulse as shown at time t58 and time t61, and when the low level rotation direction detection data is supplied, the integrated pulse is set to 0. , 1, 2, 3
When the high-level rotation direction detection data is supplied, the integrated pulse is incremented by 1 as shown in 0, -1, -2, -3, etc.
It is designed to count down each pulse. For this reason, the above-mentioned accumulating section is shown in FIG.
As shown at time t52, the integrated pulse is counted up.

Since the count value of the integrating unit is a value indicating the number of rotations of the rotating body that rotates in accordance with the amount of water used, the amount of water used by the user can be measured by detecting the count value. it can.

Next, when the rotating body shifts from rotating in the forward direction to rotating in the reverse direction (during reverse rotation), the rotating body moves as shown in FIG.
After a predetermined stop state shown from 0 (a) to (f) from time t54 to time t57, the reverse rotation is performed. When the rotating body rotates in the opposite direction, in the magnetic sensor 100, from time t57 of FIGS. 10 (a) and 10 (b).
As shown at time t61, each rotation pulse is formed in such a manner that the phase of the second rotation detection pulse advances by 90 degrees with respect to the phase of the first rotation detection pulse.

Therefore, at the time of this reverse rotation, FIG.
High-level rotation direction detection data as shown after time t60 in (e) is supplied to the integration unit, and the integration pulse is down-counted at the rising edge as shown at time t61 in FIG. Thereby, the amount of water used by the user can be detected as described above.

Next, the rotating body is performing reverse rotation,
A time chart when shifting from the reverse rotation to the normal rotation is as shown in FIG.

That is, at the time of this reverse rotation, the time t70 in the magnetic sensor 100 shown in FIGS.
As shown at time t75, the phase of the second rotation detection pulse is advanced by 90 degrees from the phase of the first rotation detection pulse, and the phase is supplied to the forward / reverse determination unit 101. As a result, the low-level data pulse shown at time t70 to time t75 in FIG. 11C is output through the Q terminal of the D flip-flop 119, and the above-mentioned first data pulse is output through the Q terminal of the D flip-flop 120. A data pulse is output as shown from time t72 to time t73 in FIG. 11D in which the first rotation detection pulse is at the high level and the second rotation detection pulse is at the high level while it is at the low level. Then, in the NOR gate 121, an integrated pulse as shown in FIG. 11 (f), which becomes low level while the output from the Q terminal of the D flip-flop 120 becomes high level, is formed and supplied to the integrating section. To be done. In addition, at the time of this reverse rotation, the forward / reverse determination unit shown in FIG.
High level rotation direction detection data as shown from time t70 to time t75 is formed and supplied to the integrating unit via the NAND gate 122 and the output terminal 104.

When the high-level rotation direction detection data is supplied, the integrating section down-counts the integrating pulse at the rising edge shown at time t73 in FIG. 11 (f). As a result, the amount of water used by the user can be measured as described above.

[0017]

However, in the conventional water meter device, the first rotation detection pulse is high at the transition from the forward rotation to the reverse rotation and at the transition from the reverse rotation to the forward rotation. There was a problem that false counts occurred when the level was reached.

Specifically, the integrating section is shown in FIG.
As shown from time t50 to time t54, the integrated pulse is up-counted in the normal rotation based on the low-level rotation direction detection data. However, when the reverse rotation is performed from the normal rotation through the stop state, The phase of the first rotation detection pulse is 9 times faster than that of the second rotation detection pulse.
Since each rotation detection pulse is formed with a delay of 0 degree, the rotation is shifted to the reverse rotation and the rotation direction detection data changes from the low level to the high level.
Between time t57 and time t60 of FIG.
As shown from 58 to time t60, the first integrated pulse at the time of reverse rotation is formed. For this reason, the first integrated pulse at the time of the reverse rotation is up-counted by the low level rotation direction detection data even during the reverse rotation. That is, the first integrated pulse that should be down-counted is up-counted, and an erroneous count occurs here.

Similarly, the accumulating unit down-counts the accumulating pulse at the time of reverse rotation by the high level rotation direction detection data as shown from time t70 to time t75 in FIG. 11 (e). When the rotation changes from the rotation to the normal rotation through the stopped state, each rotation detection pulse is formed in such a manner that the phase of the first rotation detection pulse leads the phase of the second rotation detection pulse by 90 degrees as described above. Therefore, during normal rotation, the rotation direction detection data changes from the high level to the low level between time t78 and time t81 in FIG. 11E, and time t79 in FIG.
~ As shown at time t81, the first integrated pulse at the time of forward rotation is formed. Therefore, the first integrated pulse at the time of the forward rotation is down-counted by the high-level rotation direction detection data even during the forward rotation.
That is, the first integrated pulse that should be up-counted is down-counted, which also causes erroneous counting. If such an erroneous count occurs, it hinders accurate measurement of water usage.

On the other hand, in the conventional water meter device, in order to cope with the high speed rotation of the rotating body in the use of a large amount of water, the sampling voltage generator 102 shown in FIG. Therefore, there is a problem that the power consumption is increased and the life of the battery provided in the water meter device is shortened.

The present invention has been made in view of the above problems, and the first rotation detection pulse is generated at the transition from the forward rotation to the reverse rotation and at the transition from the reverse rotation to the forward rotation. It is an object of the present invention to provide a water meter device capable of preventing an erroneous count that occurs at a high level, enabling accurate measurement of water consumption, and reducing power consumption.

[0022]

In order to solve the above-mentioned problems, a water meter device according to the present invention has two phases which are different in phase from each other according to the rotation of a rotating body which rotates according to the amount of water used. Rotation detection means for outputting rotation detection information, pulse generation means for generating forward rotation pulse and reverse rotation pulse from this rotation detection information, and rotation of the rotating body based on the rotation detection information from the rotation detection means. A rotation direction detecting unit that detects a direction and outputs the rotation direction detection information is provided. Along with this, a forward rotation pulse or a reverse rotation pulse is input based on this rotation direction detection information, and up / down counting is performed according to this forward rotation pulse or reverse rotation pulse, and this count value is used for tap water. When the rotation direction of the rotating body starts reversing, the integrating means for outputting as the measurement result of the amount and the same number of dummy forward rotation pulses and reverse rotation pulses based on the forward rotation pulse, the reverse rotation pulse and the rotation direction detection information. And dummy pulse forming means for forming an hour pulse and supplying it to the integrating means.

In the water meter device according to the present invention having such a configuration, the dummy pulse forming means is
When the rotation direction of the rotating body shifts from the forward direction to the reverse direction or from the reverse direction to the forward direction, the same number of dummy forward rotation pulses based on the forward rotation pulse, the reverse rotation pulse and the rotational direction detection information. And a pulse for reverse rotation is formed and supplied to the integrating means. The accumulating means also counts the dummy pulse, but at this time, the count value is adjusted by the dummy pulse so as to count up or down from the first pulse formed in the rotational direction after the transition. To do. As a result, counting can be accurately started from the first pulse formed during the rotation in the rotation direction after the transition. Therefore, the integration process of the integration information performed by the integration means can be made accurate, and the amount of water used can be accurately measured.

Next, the water meter device according to the present invention includes rotation detecting means for outputting two-phase rotation detection information having mutually different phases according to the rotation of the rotating body that rotates according to the amount of water used, Sampling pulse supply means for supplying the rotation detection means with a sampling pulse for generating the rotation detection information, and pulse generation means for generating a forward rotation time pulse and a reverse rotation time pulse from the rotation detection information are provided. Further, based on the rotation detection information from the rotation detection means, the rotation direction detection means that detects the rotation direction of the rotating body and outputs the rotation direction detection information, and the normal rotation based on the rotation direction detection information. A pulse or a reverse rotation pulse is input, an up / down count is performed according to the forward rotation pulse or the reverse rotation pulse, and an integration unit that outputs this count value as a measurement result of the water usage amount is provided. At the same time, when the rotation direction of the rotating body starts to reverse, the same number of dummy forward rotation pulses and reverse rotation pulses are formed based on the forward rotation pulses, the reverse rotation pulses, and the rotation direction detection information. A dummy pulse forming means to be supplied to the integrating means, a cycle detecting means for detecting a cycle of rotation detection information from the rotation detecting means, and a cycle of the rotation detection information detected by the cycle detecting means is a predetermined reference cycle. In the case of the following, instead of the forward rotation pulse or the reverse rotation pulse, the rotation detection information from the rotation detection means is supplied to the integration means, and the sampling pulse is reduced so as to reduce the frequency of the sampling pulse. The control means for controlling the supply means is provided.

With this configuration, when the cycle of the rotation detection information is equal to or less than the reference cycle, the rotation detection information that can be counted in accordance with the rotation of the rotating body is selected and integrated. , And the frequency of the sampling pulse can be switched to be reduced. Therefore, as compared with the case where a high-frequency sampling pulse is constantly supplied as the sampling pulse of each rotation detection signal from the rotation detecting means, it is possible to significantly reduce power consumption. It is possible to extend the life of the battery provided in the.

Next, in addition to the above configuration, the water meter device according to the present invention detects the presence or absence of a change in the other rotation detection information from the rotation detection means during the predetermined period of one rotation detection information. When there is no such change, it has an information change detecting means for supplying the forward rotation pulse or the reverse rotation pulse to the integrating means.

As a result, for example, even when an external impact is applied to the water meter device and the first rotation detection information currently selected by the second switching means becomes inaccurate, It is possible to switch to the correct forward rotation pulse or the reverse rotation pulse and supply it to the integrating means. Therefore, the integration process performed by the integration means can be made more accurate, and more accurate measurement of the amount of water used can be made possible.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of a water meter device according to the present invention will be described in detail with reference to the drawings.

First, the water meter device according to the first embodiment of the present invention has a first phase difference of 90 degrees from each other according to the number of rotations of the rotating body that rotates according to the amount of tap water used. A rotation sensor that outputs a second rotation detection pulse, a forward / reverse determination & combined pulse output unit that outputs an integrated pulse and rotation direction detection data according to each rotation detection pulse from the rotation sensor, A control for controlling the operation of the integrating unit for detecting the usage amount of the tap water by integrating the integrating pulse according to the rotation direction detection data from the reverse determination & composite pulse output unit, and the operation of the entire water meter device. Circuit (CPU)
It is composed of

As the rotation sensor, for example, a photoelectric rotation angle sensor or a semiconductor sensor (Hall element, Hall IC,
(A magnetic resistance element, a magnetic diode, etc.) are used to output the first and second rotation detection pulses having the phase difference of 90 degrees. For convenience of description, when the rotating body is rotating in the forward direction (during forward rotation), the second rotation detection phase is delayed by 90 degrees with respect to the phase of the first rotation detection pulse. When a pulse is formed and the rotating body is rotating in the reverse direction (during reverse rotation),
It is assumed that the second rotation detection pulse having a phase advanced by 90 degrees with respect to the phase of the first rotation detection pulse is formed.

The forward / reverse determination & composite pulse output section is shown in FIG.
As shown in, only when the rotating body rotates in the forward direction, the forward rotation pulse output unit 1 that outputs a composite pulse of each rotation detection pulse from the rotation sensor, and only when the rotating body rotates in the reverse direction, A reverse rotation pulse output unit 2 that outputs a composite pulse of each rotation detection pulse from the rotation sensor, a selector 3 that switches the composite pulses from the pulse output units 1 and 2 and supplies the integrated pulse to the integration unit, The rotation direction of the rotating body is detected based on each rotation detection pulse, and the selector 3 is switched and controlled according to the detection result.
The forward / reverse determination unit 4 supplies the detection result as rotation direction detection data to the integration unit.

Specifically, the forward / reverse determination & combined pulse output section is composed of a logic gate as shown in FIG. That is, the input terminal 6 to which the second rotation detection pulse is supplied has an input terminal of the NAND gate 16, input terminals of the OR gates 17 and 18, a clock input terminal (CK terminal) of the D flip-flop 24, and an inverter. Clock input terminal (CK
Terminals) are connected respectively. Further, the input terminal 5 to which the first rotation detection pulse is supplied is supplied via an inverter 15 to an input terminal of the NAND gate 16, input terminals of the OR gates 17 and 18, and D flip-flops 24. , 25 data input terminals (D terminals) are respectively connected.

The output terminal of the OR gate 17 is connected to the input terminal of the OR gate 19 via the inverter 20 and the OR terminal.
They are connected to the input terminals of the gate 21, respectively. Also,
The output end of the OR gate 19 is connected to the input end of the AND gate 22, and the output end of the OR gate 21 is connected to the input end of the AND gate 23.

As will be described later, when the main power supply of the water meter device is turned on, a high-level power-on pulse is formed in the CPU, and this power-on pulse is input to the input terminal 10. It is being supplied. The input terminal 10 is connected to the input terminals of the AND gates 22 and 23 and the forward / reverse determination section 4
Of the NAND gates 30 and 31 forming the
Each of them is connected to the input terminal of the ND gate 31.

In the AND gate 22, a reset pulse of the D flip-flop 24 is formed, and its output terminal is connected to the inverting reset terminal (/ R terminal) of the D flip-flop 24. There is. Further, the reset pulse of the D flip-flop 25 is formed in the AND gate 23, and its output terminal is the D flip-flop 2
5 is connected to the inverting reset terminal (/ R terminal).

The output terminal (Q terminal) of the D flip-flop 24 is connected to the selector 3 via the inverter 28.
Of the NAND gate 27 and the input terminal of the NAND gate 27. The output terminal (Q terminal) of the D flip-flop 25 is connected to the input terminal of the selector 3 and the input terminal of the NAND gate 27 via an inverter 29, and the output terminal of the NAND gate 27 is The OR gates 19 and 21 are connected to the respective input terminals.

The inverting output terminal (/ Q terminal) of the D flip-flop 24 is connected to the input terminal of the NAND gate 31, and the inverting output terminal (/ Q terminal) of the D flip-flop 25 is the NAND. It is connected to the input end of the gate 30.

In the NAND gate 30, rotation direction detection data indicating the rotation direction of the rotating body is formed, and its output end is rotated direction detection data.
The output terminal 8 of the NAND gate 31 is connected to the output terminal 8 of the NAND gate 31 via the delay circuit 9. The output terminal of the NAND gate 31 is connected to the input terminal of the NAND gate 30. The output terminal of the selector 3 is connected to the output terminal 7 of the integrated pulse, whereby the forward / reverse determination & combined pulse output section is configured.

Next, the operation of the water meter device according to the first embodiment having such a configuration will be described.

First, when the main power supply of the water meter device is turned on, the CPU detects it and forms a high-level power-on pulse. Then, this power-on pulse is passed through the input terminal 10 shown in FIG. 2 to the NAN of each of the AND gates 22 and 23 and the forward / reverse determination section 4.
Supply to the D gate 31.

On the other hand, when the main power supply is turned on, the rotation sensor starts detecting the rotation of the rotating body. When the rotating body is rotating in the forward direction, the rotation sensor measures time t in FIG. 3A according to the rotation of the rotating body.
The first rotation detection pulse as shown at 1 to time t4 and the first rotation detection pulse as shown at time t1 to time t4 of FIG. 2 rotation detection pulses are formed, and the first rotation detection pulse is supplied to the input terminal 5 and the second rotation detection pulse is supplied to the input terminal 6.

As described above, the input terminal 5 to which the first rotation detection pulse is supplied, the input terminal of the NAND gate 16 via the inverter 15, the OR gate 17,
18 input terminals, the D flip-flops 24, 25
Are connected to the respective D terminals. In addition, the second
Input terminal 6 to which the rotation detection pulse of
It is connected to the input terminal of the gate 16, each input terminal of the OR gates 17 and 18, the CK terminal of the D flip-flop 24, and the CK terminal of the D flip-flop 25 via the inverter 26.

Therefore, the output from the / Q terminal of the D flip-flop 24 is output at the timing when the second rotation detection pulse changes from the low level to the high level while the first rotation detection pulse is at the high level. From the high level to the low level, the output from the / Q terminal of the D flip-flop 24 changes from the low level at the timing when the second rotation detection pulse is at the high level and the first rotation detection pulse becomes the low level. High level. That is, a high-level composite pulse is obtained from the / Q terminal of the D flip-flop 24 only during the normal rotation.

The output from the / Q terminal of the D flip-flop 25 goes high at the timing when the second rotation detection pulse changes from high level to low level while the first rotation detection pulse is at high level. From the level to the low level, and when the second detection pulse is at the low level, the output from the / Q terminal of the D flip-flop 24 is changed from the low level to the high level at the timing when the first rotation detection pulse becomes the low level. It becomes a level. That is, a high-level composite pulse is obtained from the / Q terminal of the D flip-flop 25 only when the rotating body is in the reverse rotation state.

The / R of the D flip-flop 24 is
The output from the AND gate 22 is supplied to the terminal. Therefore, the D flip-flop 2
Reference numeral 4 denotes a timing at which the second rotation detection pulse changes from a high level to a low level when the first rotation detection pulse is in a high level, and the second rotation detection pulse changes from a low level to a high level. Each is reset at the timing when it changes to the level. Similarly, the / R terminal of the D flip-flop 25 has an AN
The output from the D gate 23 is supplied. Therefore, the D flip-flop 25 is reset at the timing when the second rotation detection pulse changes from the low level to the high level when the first rotation detection pulse is in the high level, and When the first rotation detection pulse is in the low level, the second rotation detection pulse is reset at the timing when the second rotation detection pulse changes from the high level to the low level.

Next, when the first rotation detection pulse is in the high level state, the forward / reverse determination section 4 carries out the NAND gate at the timing when the second rotation detection pulse changes from the low level to the high level. Timing at which low level rotation direction detection data is output via 30 and the second rotation detection pulse changes from high level to low level when the first rotation detection pulse is in a high level state. Then, high-level rotation direction detection data is output via the NAND gate 30. The low level rotation direction detection data indicates that the rotating body is rotating in the positive direction, and the high level rotation direction detection data indicates that the rotating body is rotating in the reverse direction. As shown. Each rotational direction detection data is supplied to the integrating section via the output terminal 8 and the selector 3 via the delay circuit 9.

As shown in FIG. 1, the selector 3 is supplied with the selected terminal 3a to which the composite pulse from the forward rotation pulse output unit 1 is supplied and the composite pulse from the reverse rotation pulse output unit 2. Selected terminal 3b and each selected terminal 3
and a selection terminal 3c for selecting one of the combined pulses supplied to a and 3b. When low level rotation direction detection data is supplied through the delay circuit 9, the selection terminal 3c is switched to the selected terminal 3a side and the composite pulse from the forward rotation pulse output section 1 is switched. Is selected and high-level rotation direction detection data is supplied via the delay circuit 9, the selection terminal 3c is switched to the selected terminal 3b side to output from the reverse rotation pulse output section 2. Select synthetic pulse.

Each composite pulse selected by the selector 3 is supplied to the integrating section via the output terminal 7 as an integrating pulse. As described above, rotation direction detection data is supplied to the integrating section together with the combined pulse. When the low-level rotation direction detection data is supplied, the integrating unit recognizes that the composite pulse currently supplied is a composite pulse at the time of forward rotation, and the composite pulse is set to 0 at the rising edge. , 1, 2, 3, ... And so on. Further, when the high-level rotation direction detection data is supplied, the integrating unit recognizes that the composite pulse currently supplied is a composite pulse at the time of reverse rotation, and outputs the composite pulse as a rising edge. 0, -1, and-
Down count like 2, -3 ... This count value is a value that indicates the number of rotations of the rotating body that rotates according to the amount of water used by the user. Therefore, the amount of water used by the user can be measured by detecting the count value obtained by the integrating unit.

Specifically, when the rotating body rotates in the forward direction, the forward / reverse determination & combined pulse output section shown in FIG.
A first rotation detection pulse as shown from time t1 to time t4 in FIG. 3A is supplied via the input terminal 5, and
A second rotation detection pulse whose phase is delayed by 90 degrees with respect to the first rotation detection pulse is supplied via the input terminal 6 from time t1 to time t4 in FIG. 3B. As a result, the D flip-flop 24 shown in FIG.
As shown from time t2 to time t3 in (c), when both the rotation detection pulses are at the high level, a combined pulse that is at the low level is formed. This synthesized pulse is inverted by the inverter 28 via the Q terminal of the D flip-flop 24 and supplied to the input terminal 3a of the selector 3.

On the other hand, during the normal rotation, low level rotation direction detection data as shown from time t1 to time t4 in FIG. 3 (e) is output through the NAND gate 30 of the forward / reverse determination unit 4. To be done. Then, the low-level rotation direction detection data is supplied to the integrating unit and the selector 3 via the output terminal 8.

When the low-level rotation direction detection data is supplied, the selector 3 switches the selection terminal 3c to the selected terminal 3a side. As a result, the pulse output unit 1 selects a composite pulse that is formed only during normal rotation, as shown at time t1 to time t4 in FIG.
This combined pulse is supplied to the integrating section via the output terminal 7 as an integrating pulse.

As described above, during this forward rotation, low level rotation direction detection data is supplied to the integrating section.
For this reason, the integration unit performs up-counting on the rising edge of the integration pulse as shown at time t3 in FIG. 3G based on the rotation direction detection data.

Here, when the rotating body shifts from the normal rotation to the reverse rotation, time t1 to time t in FIGS. 3 (a) and 3 (b).
From the forward rotation shown in FIG. 4, from time t4 in FIGS.
After the stop state shown at time t8, reverse rotation shown from time t8 to time t12 in FIGS. As described above, when the rotation direction of the rotating body shifts from the forward rotation to the reverse rotation, the first rotation detection pulse is generated as shown from time t8 to time t12 in FIGS. 3 (a) and 3 (b). The second rotation detection pulse having a phase advanced by 90 degrees from the phase of 1 is formed. Therefore, when the rotating body shifts from the forward rotation to the reverse rotation, the time t in FIG.
When the first rotation detection pulse is at the high level as shown at 4 to time t8, the first rotation detection pulse at the time of reverse rotation shown at time t8 to time t11 in FIG. Before the integrated pulse is formed, two integrated pulses are formed in the stop state as shown at time t6 to time t7 and time t8 to time t11 in the same figure (g). Therefore, when the second rotation detection pulse falls during the stop state as shown at time t6 in FIG. 3B, the low level is switched to the high level as shown at time t6 in FIG. 3E. When the integrated pulses are counted in the integrating section by the rotating direction detection data, the time t of FIG.
Since the two integrated pulses at 6 and time t8 are up-counted, erroneous counting will occur.

From the above, in the water meter device, the delay circuit 9 performs the time from time t6 to time t7 in FIG. 3 (f) with respect to the rotation direction detection data shown in FIG. 3 (e). The delay processing is performed for a minute, and this is supplied to the selector 3 as a switching control pulse. The delay time applied to this rotation direction detection data is in the middle of the timing of each rising edge of the integrated pulse shown at time t6 and the integrated pulse shown at time t8 in FIG. The switching control pulse is set to rise from the low level to the high level at the timing shown as time t7 in FIG. 3 (f).

As a result, if, for example, the integrating pulse at time t3 in FIG. 3 (g) is counted up to +1 in the integrating unit, the integrating pulse at time t6 is counted up to +2, but at time t8. The integrated pulse shown by is counted down to +1 and the integrated pulse shown at time t12 which is the first integrated pulse after the reverse rotation shift is counted down from 0. That is, the integration unit counts the two integration pulses during the stop period formed at the time t6 and the time t8 so as to be zero. Therefore, it is possible to cancel the counting of the two integrated pulses during the stop period and accurately count down from 0 the integrated pulse shown at time t12 which is the first integrated pulse after the reverse rotation transition.

Next, when the rotating body shifts from reverse rotation to forward rotation, time t21 to time t in FIGS. 4 (a) and 4 (b).
The normal rotation shown at 26 is shifted to the normal rotation shown at time t30 to time t35 through the stopped state shown at time t26 to time t30. When the rotation direction of the rotating body is changed from the reverse rotation to the normal rotation, as shown in FIGS.
As shown from time t30 to time t35, a second rotation detection pulse having a phase delayed by 90 degrees from the phase of the first rotation detection pulse is formed. Therefore, when the first rotating detection pulse is at the high level as shown from time t26 to time t30 in FIG. 4A when the rotating body shifts from the reverse rotation to the forward rotation, each rotation detection is performed. Due to the phase difference between the pulses, the time t28 to the time t29 in the same figure (g) in the above stop state is formed before the first integrated pulse at the time of normal rotation shown after the time t34 in the same figure (g) is formed.
And, as shown from time t30 to time t33, two integrated pulses are formed. Therefore, when the second rotation detection pulse rises during the stop state as shown at time t28 in FIG. 4 (b), the high level is switched to the low level as shown at time t28 in FIG. 4 (e). When the integrated pulses are counted in the integrating unit by the rotation direction detection data, the state shown in FIG.
Since the two integrated pulses at time t28 and time t30 are down-counted, an erroneous count will occur.

From the above, in the water meter device, the delay circuit 9 causes the rotation direction detection data shown in FIG.
Of the delay time, and the delay control pulse is supplied to the selector 3 as a switching control pulse. The delay time applied to this rotation direction detection data is intermediate between the timings of the rising edges of the integrated pulse shown at time t28 and the integrated pulse shown at time t30 in FIG. It is timing t29 in FIG. 4 (f).
The switching control pulse is set to fall from the high level to the low level at the timing shown in FIG.

As a result, if the integration pulse at the time t24 in FIG. 4 (g) is down-counted to -1 in the integration unit, the integration pulse at the time t28 is down-counted to -2. The integrated pulse at time t30 is counted up to -1, and the integrated pulse at time t34, which is the first integrated pulse after the reverse rotation transition, is counted up from 0. That is,
The integrating unit counts the two integrated pulses during the stop period formed at the time t28 and the time t30 so as to be zero. Therefore, it is possible to cancel the counting of the two integrated pulses during the stop period and accurately count up from 0 the integrated pulse shown at time t34 which is the first integrated pulse after the reverse rotation.

As is clear from the above description, in the water meter device according to the first embodiment, when the rotating body shifts from the forward rotation to the reverse rotation, and when the reverse rotation changes to the forward rotation. Even if the first detection pulse is at the high level, counting can be started accurately from the first integrated pulse formed according to the rotation state after the transition.
Therefore, the counting operation performed by the integrating unit can be made accurate, and the amount of water used can be accurately measured.

Next, a water meter device according to a second embodiment of the present invention will be described. In addition, in the description of the water meter device according to the second embodiment, the same reference numerals are given to the portions showing the same operations as those of the water meter device according to the above-described first embodiment, and the detailed description thereof will be given. Omit it.

In the water meter device according to the second embodiment, the forward / reverse determination & combined pulse output section of the water meter device according to the first embodiment described above is used as the forward / reverse determination & as shown in FIG. In addition to having the combined pulse output section 35, it also has a cycle measuring section 36, a selector 39, and a sensor sampling control section 37.

As shown in FIG. 5, the period measuring unit 36 measures the interval from the fall of the first rotation detection pulse supplied from the magnetic sensor 41 through the input terminal 5 to the fall of the next pulse. A counter 45 that counts (cycle) with a clock of a predetermined frequency, a decoder 46 that decodes the count value from the counter 45 at each falling edge of the first rotation detection pulse, and a reference for the first rotation detection pulse. The reference value generator 48 in which the reference count value corresponding to the cycle is stored is compared with the count value from the counter 45 and the reference count value from the reference value generator 48, and the comparison result is used as the switching control data. It is composed of a comparator 47 which is supplied to the selector 39.

In the water meter device according to the second embodiment having such a configuration, the first and second rotation detection pulses from the rotation sensor are supplied to the forward / reverse determination & combined pulse output section 35. It Further, the first rotation detection pulse is supplied to the counter 45 of the cycle measuring unit 36, the decoder 46, and the selected terminal 39 a of the selector 39.

The forward / reverse determination & synthetic pulse output section 35 is
As described in the first embodiment, the integrated pulse is formed and supplied to the selected terminal 39b of the selector 39, and the rotation direction detection data indicating the rotation direction of the rotating body of the rotation sensor is obtained. It is formed and is supplied to the integrating unit via the output terminal 8.

In the cycle measuring section 36, when the first rotation detection pulse is supplied, the counter 45 measures the interval (cycle) from the fall of the first rotation detection pulse to the fall of the next pulse. It counts with the clock of a predetermined frequency, and supplies this count value to the decoder 46. The decoder 46 decodes the count value from the counter 45 at each falling edge of the first rotation detection pulse,
This is supplied to the comparator 47. In addition to the decode output, the comparator 47 includes a reference value generator 4
The reference count value corresponding to the average period of the first rotation detection pulse is supplied from 8. Therefore, the comparator 47 compares the count value from the counter 45 with the reference count value from the reference value generating unit 48, supplies the comparison result to the sensor sampling control unit 37, and also uses the selector as switching control data. 39.

The first rotation detection pulse is supplied to the selected terminal 39a of the selector 39 via the input terminal 5, and the selected terminal 39b is described in the first embodiment. The integrated pulse is supplied from the forward / reverse determination & combined pulse output unit 35. The selector 39 is
According to the switching control data supplied from the comparator 47, the selection terminal 39c selects any pulse supplied to the selected terminal 39a or the selected terminal 39b, and outputs it as an integrated pulse. Further, the sensor sampling control unit 37 forms sensor sampling control data for controlling the drive frequency of the rotation sensor according to the comparison output from the comparator 47, and outputs this to the rotation sensor via the output terminal 49. Supply.

Thus, according to the cycle of the first rotation detection pulse, the first rotation detection pulse or the forward / reverse determination &
The integrated pulse from the combined pulse output unit 35 can be supplied to the integrated unit, and the rotation sensor can be driven by the drive pulse having the optimum frequency.

That is, the integrated pulse formed by the forward / reverse determination & combined pulse output section 35 is as shown in FIG.
As shown in (b) and (g), it is not formed when the overlapping portion of the first and second rotation detection pulses is not detected. Therefore, when the rotating body rotates at high speed, each rotation from the rotation sensor is It is necessary to set the sampling frequency of the detection signal to a high frequency, but when the rotating body is rotating at a low speed, it is possible to sufficiently follow the rotation speed of the rotating body even if the sampling frequency is set to a low frequency.

Therefore, in the water meter device according to the second embodiment, the period measuring unit 36 detects the period of the first rotation detection pulse. Then, when the cycle of the first rotation detection pulse is equal to or shorter than the predetermined cycle,
The selector 39 is switched and controlled so that the integrated pulse supplied to the integrating unit is switched to the first rotation detection pulse, and the sampling pulse of the rotation detection signal from the rotation sensor is controlled to a low frequency by the sensor sampling control unit 37. .

As a result, the sampling pulse of the rotation detection signal can have a low frequency. Therefore, the high-frequency sampling pulse for high-speed rotation is supplied to the constant rotation sensor when the rotating body rotates at a high speed. Power consumption can be significantly reduced as compared with the case where the power is supplied. Therefore, it is possible to extend the life of the battery provided in the water meter device.

In this case, the comparison output from the comparator 47 is supplied to the CPU, and when the comparison output in which the sampling pulse of the rotation detection signal has a low frequency is supplied to the CPU, the forward / reverse rotation is performed. The power supplied to the determination & combined pulse output unit 35 may be controlled to be turned off. Alternatively, during normal rotation, the forward / reverse determination & composite pulse output unit 35 controls the reverse rotation pulse output unit 2 to a stopped state, and during reverse rotation, the normal / reverse determination & composite pulse output unit 35.
The normal rotation pulse output unit 1 may be controlled to be in a stopped state. Thus, when the first rotation detection pulse is selected as the integrated pulse, it is possible to stop the wasteful power supply to the forward / reverse determination & combined pulse output unit 35 and the like, and further the water meter device. Power consumption can be reduced.

Next, a water meter device according to the third embodiment of the present invention will be described. Note that, also in the description of the water meter device according to the third embodiment, the same reference numerals are given to the portions showing the same operations as those of the water meter devices according to the above-described first and second embodiments, and Detailed description is omitted.

As shown in FIG. 6, the water meter device according to the third embodiment has a configuration in which a signal change presence / absence determining unit 38 is added to the water meter device according to the second embodiment described above. Has become.

The signal change presence / absence determining unit 38 is composed of logic gates as shown in FIG. 7, and the input terminal 51 to which the first rotation detecting pulse is supplied is the inverter 5
4 is connected to the clock input terminal (CK terminal) of the D flip-flop 58 and the input terminal of the reset control circuit 60. Further, the input terminal 52 to which the second rotation detection pulse is supplied is connected to the CK terminal of the D flip-flop 56 and also connected to the CK terminal of the D flip-flop 57 via the inverter 55. Each data input terminal (D
Terminal) is connected to the power supply voltage (VDD), and each inverted data output terminal (/ Q terminal) is connected to the input terminal of the AND gate 59. The output terminal of the reset control circuit 60 is connected to the inverting reset terminal (/ R terminal) of each D flip-flop. The D terminal of the D flip-flop 58 is connected to the output terminal of the AND gate 59, and the / R terminal is
When the main power supply of the water meter device is turned on, it is connected to the input terminal 53 to which a high-level power-on pulse is supplied, and the / Q terminal is supplied to the switching control data output terminal 61. ing.

In the water meter device according to the third embodiment having such a configuration, the signal rotation presence / absence determining section 38 shown in FIG. 7 is supplied with the first rotation detection pulse via the input terminal 51. Then, the second rotation detection pulse is supplied through the input terminal 52, and the power-on pulse from the CPU which becomes high level when the main power supply is turned on is supplied through the input terminal 53.

The first rotation detection pulse is supplied to the reset control circuit 60 via the inverter 54 and the CK terminal of the D flip-flop 58.
The second rotation detection pulse is supplied to the CK terminal of the D flip-flop 56 and the inverter 55.
Is supplied to the CK terminal of the D flip-flop 57 via. A power supply voltage is supplied to the D terminal of each of the D flip-flops, and the inverting reset terminal (/ R terminal) is
Reset control data is supplied from the reset control circuit 60.

The D flip-flop 56 detects the rising edge of the second rotation detection pulse and supplies the inverted output to the AND gate 59 via the / Q terminal at this detection timing. Further, the D flip-flop 57 has a second
The falling edge of the rotation detection pulse is detected and the inverted output is supplied to the AND gate 59 via the / Q terminal at this detection timing. The reset control circuit 60 is
The falling edge of the first rotation detection pulse is detected, and one reset pulse is supplied to each D flip-flop 56, 57 at this detection timing.

The AND gate 59 detects the presence / absence of change in the second rotation detection pulse based on the inverted outputs from the D flip-flops 56 and 57 (each / Q).
Output match detection), and supplies the detection data to the D terminal of the D flip-flop 58. As described above, the first rotation detection pulse is supplied via the CK terminal inverter 54 of the D flip-flop. Therefore, the D flip-flop 58 is read with the detection data indicating whether or not the second rotation detection pulse has changed each time the first rotation detection pulse falls, and the detection data is used as the switching control data. Is supplied to the selector 39 shown in FIG. 6 via the / Q terminal and the output terminal 61. The selector 39 switches and outputs the first rotation detection pulse or the integrated pulse from the forward / reverse determination & composite pulse output unit 35 according to the switching control data.

Specifically, for example, the selector 3 is currently used.
The first rotation detection pulse is selected by 9,
If an external impact is applied to the water meter device in this state, the first rotation detection pulse may not be accurately formed. In this case, the change of the second rotation detection pulse does not appear during one cycle of the first rotation detection pulse. Therefore, the signal change presence / absence determining unit 3
Reference numeral 8 denotes the forward / reverse determination & synthesis from the currently selected first rotation detection pulse when a change in the second rotation detection pulse is not detected during one cycle of the first rotation detection pulse. The selector 39 is switched and controlled so as to forcibly switch to the integrated pulse from the pulse output unit 35.
As a result, the accurate cumulative pulse can be supplied to the integrating unit in place of the inaccurate first rotation detection pulse, so that erroneous counting in the integrating unit can be prevented and the counting operation can be made accurate. You can

In the description of each of the above embodiments, the forward / reverse determination & combined pulse output section 35 has the logic gate configuration shown in FIG. 2, and the signal change presence / absence determination section 38 has the logic gate configuration shown in FIG. However, this is only an example, and as long as the configuration performs the same operation as described above, other various modifications according to the design etc. are possible within the scope not departing from the technical idea of the present invention. Of course, it is possible.

[0081]

The water meter device according to the present invention, when the first rotation detection pulse is at a high level at the transition from the forward rotation to the reverse rotation and at the transition from the reverse rotation to the forward rotation, respectively. It is possible to prevent erroneous counting that occurs. Therefore, it is possible to accurately measure the amount of water used by the user.

Further, when the rotating body rotates at a low speed, the pulse to be integrated can be switched from the composite pulse to the first rotation detection pulse (or the second rotation detection pulse), so that the power consumption is reduced. Therefore, the life of the battery provided in the water meter device can be extended.

Furthermore, when an external shock or the like is applied to the water meter device and the pulse currently being integrated is inaccurate, the pulse to be integrated is set to the other accurate synthetic pulse or the like. Since it is possible to switch, it is possible to prevent an erroneous count and to accurately measure the water consumption of the user through a more accurate counting operation.

[Brief description of drawings]

FIG. 1 is a block diagram of a forward / reverse determination & combined pulse output unit provided in a water meter device according to a first embodiment of the present invention.

FIG. 2 is a logic circuit diagram showing a configuration of the forward / reverse determination & combined pulse output unit.

FIG. 3 is a time chart for explaining the operation of the water meter device according to the first embodiment at the time of forward rotation.

FIG. 4 is a time chart for explaining an operation during reverse rotation of the water meter device according to the first embodiment.

FIG. 5 is a block diagram of a water meter device according to a second embodiment of the present invention.

FIG. 6 is a block diagram of a water meter device according to a third embodiment of the present invention.

FIG. 7 is a logic circuit diagram showing a configuration of a signal change presence / absence determination unit provided in the water meter device according to the third embodiment.

FIG. 8 is a block diagram of a conventional water meter device.

FIG. 9 is a logic circuit diagram showing a configuration of a forward / reverse determination & combined pulse output unit provided in a conventional water meter device.

FIG. 10 is a time chart for explaining the operation of the conventional water meter device during normal rotation.

FIG. 11 is a time chart for explaining the operation of the conventional water meter device during reverse rotation.

[Explanation of symbols]

1 Forward rotation pulse output section 2 Reverse rotation pulse output section 3 Selector 4 Forward / reverse determination section 5 Input terminal for the first rotation detection pulse 6 Input terminal for the second rotation detection pulse 7 Integrated pulse output terminal 8 Rotation direction Detection data output terminal

Claims (3)

[Claims] 1. A rotation detection means for outputting rotation detection information of two phases having different phases according to the rotation of a rotating body that rotates according to the amount of water used, and a normal rotation pulse and Pulse generation means for generating a reverse rotation pulse; rotation direction detection means for detecting the rotation direction of the rotating body based on the rotation detection information from the rotation detection means and outputting this rotation direction detection information; A forward rotation pulse or reverse rotation pulse is input based on direction detection information, up / down counting is performed according to this forward rotation pulse or reverse rotation pulse, and this count value is output as the measurement result of the water consumption. When the rotating means of the rotating means starts reversing, the same number of dummy forward rotation pulses and reverse rotation rotation pulses and reverse rotation rotation pulses and reverse rotation rotation pulses are detected based on the rotation direction detection information. Water meter apparatus; and a dummy pulse forming means to form a time pulse supplied to the integrating means. 2. A rotation detection unit for outputting rotation detection information of two phases having different phases according to the rotation of a rotating body that rotates according to the amount of water used, and the rotation detection for the rotation detection unit. Sampling pulse supply means for supplying a sampling pulse for generating information, pulse generation means for generating a forward rotation time pulse and a reverse rotation time pulse from the rotation detection information, and based on the rotation detection information from the rotation detection means A rotation direction detecting means for detecting the rotation direction of the rotating body and outputting the rotation direction detection information, and a forward rotation time pulse or a reverse rotation time pulse based on the rotation direction detection information. Alternatively, the up / down count is performed according to the reverse rotation pulse, and the integrating means for outputting this count value as the measurement result of the water usage amount and the rotation direction of the rotating body are When the rotation is started, dummy pulse forming means for forming the same number of dummy forward rotation pulses and reverse rotation pulses based on the forward rotation pulses, the reverse rotation pulses and the rotation direction detection information and supplying the dummy means with the dummy pulse forming means, When the cycle detection means for detecting the cycle of the rotation detection information from the rotation detection means, and the cycle of the rotation detection information detected by the cycle detection means is less than or equal to a predetermined reference cycle, the normal rotation pulse Alternatively, instead of the reverse rotation pulse, the rotation detection information from the rotation detection means is supplied to the integration means, and the control means controls the sampling pulse supply means so as to reduce the frequency of the sampling pulse. Characteristic water meter device. 3. The presence / absence of a change in the other rotation detection information from the rotation detection means during a predetermined period of one rotation detection information is detected, and when there is no change, the forward rotation pulse or the reverse rotation pulse is detected. 3. The water meter device according to claim 2, further comprising information change detecting means for supplying an hour pulse to the integrating means.