KR20210017922A - Sensor and control method thereof - Google Patents

Abstract

According to one embodiment, a meter reading device can comprise: a rotating plate; a magnet disposed on one surface of the rotating plate; a first reed switch and a second reed switch; and a control unit for generating a state conversion value on the basis of the state of a pulse signal generated as a result of the interaction between the first and second reed switches and the magnet, and then determining the rotating direction of the rotating plate on the basis of the generated state conversion value.

Description

TECHNICAL FIELD [Sensor and control method thereof]

The present invention relates to a meter reader and a control method of a meter reader, and more particularly, to a technology for controlling a meter reader and a detector that accurately detects the rotation direction of a rotating plate using pulse values generated by a plurality of reed switches. .

Industrial development using machines makes people's lives very convenient. As one of them, electricity, tap water, gas, and the like are supplied to each household, making family life convenient and comfortable.

In this way, as electricity, tap water, and gas are supplied to each home, the user must pay the cost according to the amount of use. At this time, various meters that record the amount of use, for example, relays, water meters, gas meters, etc. It is installed and used for each household or for a certain unit of furniture.

Typically, integrated watt-hour meters are widely used to detect power used in homes as well as industries in real time and to accumulate the amount of power used. And the like, and the number of rotations of the disk rotating according to the amount of current used can be mechanically counted and displayed as an accumulated power amount.

A general meter for use in wireless meter reading (OMR) by improving a meter with such a mechanical structure, when using 1Kwh, a magnet is installed on a part of the display rotating plate of the metering display device that rotates 1, and is displayed with a reed switch. It is designed to electronically measure power consumption by generating a pulse signal according to the number of rotations of the rotating plate and counting it by Micom.

In general, a reed switch, as shown in FIG. 1, has a built-in'S' pole 20 of a magnet at the lower end of a meter reader case 10 including a reed switch formed in a'c' shape, and the reed switch case 10 ) At the top, it is formed in a vacuum state or by inserting magnetic leads from both sides of a gas-sealed glass tube.

In the normal state, the N-pole and S-pole magnets 20 in the reed switch are in a bonded state (conducting state). When the magnetic flux between 20) is blocked, the terminals of the S-pole and N-pole contacts in the reed switch 30 are opened by their own elastic force, and are converted into a non-conductive state.

However, in the case of a meter reader including a reed switch according to the prior art, since only one reed switch 30 is configured as a path through which current can flow, the operation of the mechanical device and the system is stopped when the corresponding reed switch fails. There was a problem that reliability was degraded because there was a concern that a safety problem may occur.

Also, in the case of a meter reader including a reed switch, when the rotating plate rotates one turn in the forward direction, it is counted and displayed to the outside. There was a problem to do.

Accordingly, the present invention is an invention devised to solve the problems of the prior art as described above, and is to provide a meter reader including a reed switch capable of accurately detecting an operating direction of a rotating plate using a plurality of reed switches. to be.

More specifically, a state conversion value is generated based on the pulse signal generated by the reed switch, and then direction is determined based on the generated state conversion value to determine whether the rotating plate is rotating in the forward direction or in the reverse direction. It is to provide a possible meter reader.

In addition, in the meter reader using two reed switches, it is possible to accurately determine whether or not one meter reader has a fault and does not rotate normally, and inform the user of the current state of the reed switch when it is determined that a fault has occurred. This is to provide a meter reader.

The meter reader according to an embodiment is generated due to the interaction between a rotating plate, a magnet disposed on one surface of the rotating plate, a first lead switch and a second lead switch, the first and second lead switches, and the magnet. After generating a state conversion value based on a state of the pulse signal, a controller may determine whether or not the first and second lead switches malfunction based on the generated state conversion value.

The control unit, after summing the state conversion values for the first and second lead switches over time, respectively, whether the first lead switch and the second lead switch malfunction based on the direction of the summed value Can judge.

The first lead switch and the second lead switch are disposed within a first distance, and the first distance is a period of a high pulse signal by the first lead switch and a high pulse by the second lead switch. It may be a distance arranged so that at least some of the sections of the signal overlap.

When the pulse signal of the first lead switch is high, the control unit sets a state conversion value to A, and when the pulse signal of the second lead switch is high, the state conversion value is B, When the pulse signal of the first and second lead switches is low, the state conversion value is converted to C, and then the first lead is based on the sum of A, B, and C (X). It is possible to determine whether the switch and the second lead switch malfunction.

C is 0, and the absolute value of A may be a real number having a value smaller than the absolute value of B.

The controller may determine that one of the first lead switch and the second lead switch has failed when the value of X is continuously repeated as two values.

The control unit determines that the second lead switch has failed when the difference between the absolute values of the two values is the same as A, and when the difference between the absolute values of the two values is the same as the B, the first lead switch Can be judged to be broken.

The first and second lead switches are disposed beyond a second distance, and the second distance is a period of a high pulse signal by the first lead switch and a high pulse signal by the second lead switch. ) It can be arranged so that there is no section where the section of the pulse signal overlaps.

The control unit, when the pulse signal of the first lead switch is high (High), the state conversion value is A, when the pulse signal of the second lead switch is high (High), the state conversion value is B, When the pulse signal of the first lead switch and the second lead switch is low and the state of the pulse signal of the first lead switch is changed, the state conversion value is C, and the pulse signal of the second lead switch is When the state is changed, the state conversion value is set to D, and the presence or absence of a malfunction of the first and second lead switches may be determined based on the sum of A, B, C, and D (Y).

C is 0, the absolute values of A, B and D have different values, and the absolute value of D may be a real number greater than the sum of the absolute value of A and the absolute value of B.

The controller may determine that one of the first lead switch and the second lead switch has failed when the value of Y is continuously repeated as two values.

The control unit determines that the second lead switch has failed when the difference between the absolute values of the two values is the same as A, and when the difference between the absolute values of the two values is the same as the B, the first lead switch Can be judged to be broken.

The meter may further include at least one of a display unit for externally displaying information on a current state of the reed switch and a communication unit for notifying a user when it is determined that the reed switch has failed.

When it is determined that the first lead switch or the second lead switch has failed, the controller may control the operation of the meter reader based on a normally operated reed switch.

In another embodiment, a method for controlling a meter reading device includes a state conversion value based on a state of a pulse signal generated by an interaction between a first and second lead switch coupled to a rotating plate and a magnet for each of the plurality of reed switches. Calculating each, summing the state conversion values for the first and second lead switches over time, and the first and second leads of the rotating plate based on the directionality of the summed values It may include the step of determining whether the switch malfunctions.

The first lead switch and the second lead switch are disposed within a first distance, and the first distance is a period of a high pulse signal by the first lead switch and a high pulse by the second lead switch. It may be a distance arranged so that at least some of the sections of the signal overlap.

The step of determining whether the first lead switch and the second lead switch malfunction or not may include a state conversion value of A when the pulse signal of the first lead switch is high, and the pulse signal of the second lead switch. When is high, the state conversion value is B, and when the pulse signals of the first and second lead switches are low, the state conversion value is converted to C, and then A, B And determining based on the sum of C (X), wherein C is 0, and the absolute value of A may have a value smaller than the absolute value of B.

The determining whether the first and second lead switches are malfunctioning may include determining that one of the first and second lead switches has failed when the value of X is continuously repeated as two values. It may include.

The step of determining whether the first lead switch and the second lead switch malfunction or not may include determining that the first lead switch has failed when a difference between the absolute values of the two values is the same as A, and If the difference in absolute value is the same as B, determining that the second lead switch has failed.

In the first lead switch and the second lead switch, the first lead switch and the second lead switch are disposed beyond a second distance, and the second distance is a high pulse signal generated by the first lead switch. It may be a distance arranged so that there is no section in which the section and the section of the high pulse signal by the second lead switch overlap.

The step of determining whether the first lead switch and the second lead switch are malfunctioning is a state conversion value of A when the pulse signal of the first lead switch is High, and the pulse signal of the second lead switch is When the state is high, the state conversion value is B, and when the pulse signal of the first and second lead switches is Low and the state of the pulse signal of the first lead switch is changed The value is C, and if the state of the pulse signal of the second lead switch is changed, the state conversion value is set to D, and whether the reed switch malfunctions based on the sum of A, B, C and D (Y). And determining, wherein C is 0, and the absolute values of A, B and D have different values, and the absolute value of D is greater than the sum of the absolute value of A and the absolute value of B. It can be a big mistake.

The determining whether the first and second lead switches are malfunctioning may include determining that one of the first and second lead switches has failed when the Y value is continuously repeated as two values. It may include.

The determining whether the first lead switch and the second lead switch malfunction or not may include determining that the first lead switch has failed when the absolute difference between the two values is the same as that of B, and When the difference between the absolute values is the same as A, determining that the second lead switch has failed.

In the case of the meter reader and the control method of the meter reader according to an embodiment, it is possible to accurately know whether the rotating plate rotates in the reverse direction compared to the conventional technology using a single reed switch, thereby improving the performance of the meter reader.

In addition, even if only two reed switches are used, the same effect can be obtained as in the case of using three or more reed switches, so it is possible to manufacture a meter more economically than a conventional meter, and to use the space inside the meter more efficiently. There are effects that can be done.

In addition, even when two reed switches are attached close to each other or manufactured far apart depending on the situation of the product, since the operation and control are performed differently depending on the case, there is an effect of accurately knowing the normal operation of the meter reader.

In addition, in the meter reader using two reed switches, when a failure occurs in one meter and does not operate normally, according to the prior art, it was difficult to accurately determine this, but the meter including the reed switch according to an embodiment is accurately There is an effect of determining this and notifying the user of the current state of the reed switch.

1 is a view showing a part of a cross-sectional view of a meter reader including a reed switch according to an embodiment.
2 is a diagram illustrating an example of a wireless meter reading meter to which a meter reader including a reed switch according to an embodiment can be applied.
3 is a diagram for explaining a pulse signal generated by one reed switch.
4 is a view for explaining a method of determining the rotation direction and the number of rotations of a rotating plate using one reed switch.
5 is a diagram illustrating a pulse signal generated by an interaction between a magnet and a first lead switch and a second lead switch, according to an exemplary embodiment.
6 is a diagram illustrating a state conversion value generated based on a pulse signal generated by an interaction between a magnet, a first lead switch, and a second lead switch, according to an exemplary embodiment.
7 is a diagram illustrating forward and reverse directions of state conversion values generated based on a pulse signal, according to an exemplary embodiment.
8 is a diagram illustrating a pulse signal generated by an interaction between a magnet and a first lead switch and a second lead switch according to another embodiment.
9 is a diagram illustrating a state conversion value generated based on a pulse signal generated by an interaction between a magnet, a first lead switch, and a second lead switch, according to another embodiment.
10 is a diagram illustrating a forward direction and a reverse direction of a state conversion value generated based on a pulse signal, according to another embodiment.
11 is a diagram illustrating a state conversion value generated based on a pulse signal when a first lead switch fails in a high state.
12 is a diagram illustrating a state conversion value generated based on a pulse signal when a first lead switch fails in a low state.
13 is a diagram illustrating a state conversion value generated based on a pulse signal when a second lead switch fails in a high state.
14 is a diagram illustrating a state conversion value generated based on a pulse signal when a second lead switch fails in a low state.
15 is a diagram for explaining a method of determining whether a reed switch has failed, according to an exemplary embodiment.
16 is a diagram illustrating a state conversion value generated based on a pulse signal when a first lead switch fails in a high state.
FIG. 17 is a diagram illustrating a state conversion value generated based on a pulse signal when a first lead switch fails in a low state.
18 is a diagram illustrating a state conversion value generated based on a pulse signal when a second lead switch fails in a high state.
FIG. 19 is a diagram illustrating a state conversion value generated based on a pulse signal when a second lead switch fails in a low state.
20 is a diagram for explaining a method of determining whether a reed switch has failed, according to another exemplary embodiment.
21 is a diagram illustrating some components of a meter reader including a reed switch according to an embodiment.
22 is a flowchart illustrating a method of controlling a meter reader including a reed switch according to an exemplary embodiment.

The embodiments described in the present specification and the configurations shown in the drawings are preferred examples of the disclosed invention, and there may be various modifications that may replace the embodiments and drawings of the present specification at the time of filing of the present application.

In addition, terms used in the present specification are used to describe embodiments and are not intended to limit and/or limit the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present specification, terms such as "comprise", "include" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification. Or the presence or addition of other features, numbers, steps, actions, components, parts, or combinations thereof, or any other feature, or a number, steps, operations, components, parts, or combinations thereof, and includes ordinal numbers such as "first" and "second" used herein. The terms described above may be used to describe various components, but the components are not limited by the terms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. In addition, in the drawings, parts not related to the description are omitted in order to clearly describe the present invention.

FIG. 2 is a diagram illustrating an example of a wireless meter reading meter 10 to which the meter reader 100 including a reed switch according to an embodiment can be applied.

Referring to FIG. 2, the mechanical meter 10 may include a disc 111, a gear part 121, a plurality of display rotating plates 131, 132, 133, a display part 151, and a reed switch 160, The reed switch 160 may be connected to the meter reader 100 through wires 171.

The disk 111 may rotate in proportion to the amount of electricity, water, gas, and the like. When the disk 111 rotates, the gear unit 121 operates, and accordingly, the display rotation plates 131, 132, and 133 may rotate, and the display unit as the plurality of display rotation plates 131, 132, 133 rotates. In 151, the amount of electricity, water, gas, etc. may be displayed.

Each display value may be repeatedly displayed as 1,2,3,4,5,6,7,8,9,0, respectively, as the plurality of display rotating plates 131, 132, and 133 rotate once. That is, the display value of the display rotating plate 132 in the high position increases by 1 each time the display rotating plate 131 of the lower digit is rotated, and the display rotating plate in the higher digit every time the display rotating plate 132 rotates. The display value of 133 can be increased by one.

In order to electronically measure such a mechanical display value, a magnet 141 can be attached to a position where the display rotary plate 131 in the lower position rotates once, and a reed switch 160 can be installed near the display rotary plate 131. have.

Then, whenever the display rotation plate 131 rotates once and the magnet 141 is adjacent to the reed switch 160, the leads 163 installed in the reed switch 160 may be coupled to each other. That is, the reed switch 160 may be turned on.

In addition, when an external voltage is applied to the reed switch 160, a pulse signal is generated every time the reed switch 160 is turned on, and when the pulse signal is counted, the amount of electricity, water, gas, etc. can be electronically measured.

3 is a diagram illustrating a pulse signal generally generated by the interaction between a magnet and a reed switch, and FIG. 4 is a diagram illustrating a forward and a reverse direction of a state conversion value generated based on a pulse signal according to an embodiment. It is a drawing.

Referring to FIG. 3, when the magnet 220 is adjacent to the reed switch 160 as described in FIG. 2, the leads inside the reed switch 160 can be coupled to each other, As shown, a pulse signal may be generated.

That is, when the leads are coupled, a high signal is transmitted as a pulse signal as shown in FIG. 3, and when the magnet 220 is separated from the reed switch 160, the leads are disconnected, so that a pulse signal is not generated. In other words, a low signal may be transmitted.

In addition, the controller 200 calculates the number of rotations of the rotating plate based on the state change of the pulse signals, and may calculate the number of rotations by generating a state conversion value from the pulse signals.

Specifically, when receiving a high signal, the control unit 200 generates 1 as a state conversion value, and when receiving a low signal, generates 0 as a state conversion value, and the control unit 200 rotates one rotation of the rotating plate. Since 0 and 1 are received each time, the number of rotations of the rotating plate can be recognized by counting the number of received high signals.

For example, if the received signal flow is 0, 1, 0, 1, 0, 1, 1 is received 3 times, so it can be recognized that the rotating plate has rotated 3 times, and the received signal flow is 0, 1, In the case of 0, 1, 0, 1, 0, 1, 1 is received 5 times, so it can be recognized that the rotating plate has rotated 5 times.

Therefore, in the case of recognizing the number of rotations of the rotating plate using one reed switch, the circuit configuration is reduced and the algorithm is also simplified, but the same pulse signal is input even if the rotating plate rotates in the reverse direction instead of the forward direction. There is a problem that the number and the number of rotations counted do not match.

In other words, accurate meter reading can be performed only when the number of rotations of the rotating plate is recognized as rotating only when it is rotated in the forward direction.If there is only one reed switch, the pulse signal is 1, 0 even when rotated in the reverse direction due to malfunction. , 1, 0, so there was a problem of recognizing that the rotating plate rotated that much.

Accordingly, the meter reader 100 including the reed switch 160 according to an embodiment is to provide a meter reader capable of accurately determining the rotation of the rotating plate in the reverse direction using a plurality of meter readers and notifying the user of the accurate measurement result. to be. Hereinafter, it will be described in detail through the drawings.

5 is a diagram showing a pulse signal generated by the interaction between a magnet and a first lead switch 161 and a second lead switch 162, according to an embodiment, and FIG. A diagram showing a state conversion value generated based on a pulse signal generated by an interaction between the magnet 220 and the first lead switch 161 and the second lead switch 162. 7 is a diagram illustrating forward and reverse directions of state conversion values generated based on pulse signals generated by the first and second lead switches 161 and 162, according to an exemplary embodiment.

In FIG. 5, it is shown that there are two reed switches (161, 162) for convenience of explanation, but the present invention is not limited thereto, and if the present invention can be applied, the reed switch is composed of various numbers such as three or four. Can be.

In addition, the first lead switch 161 and the second lead switch 162 may be disposed at positions close to each other or at positions far apart from each other according to a design method and purpose.

As an example of being disposed in close proximity to the first and second lead switches 161 and 162, as shown in FIG. 5, the high voltage generated by the first and second lead switches 161 and 162 It may be disposed at a location where the section d in which the pulse signal overlaps occurs.

Conversely, an example in which the first and second lead switches 161 and 162 are disposed far apart from each other is generated by the first and second lead switches 161 and 162 as shown in FIG. 8. It may be disposed at a position such that there is no overlapping section of the high pulse signals (a, b, c).

Accordingly, FIGS. 6 and 7 are diagrams described on the assumption that a pulse signal as shown in FIG. 5 is generated, and FIGS. 9 and 10 are described on the assumption that a pulse signal as shown in FIG. 8 is generated.

Returning to FIG. 5 to explain, when the magnet 220 is adjacent to the first lead switch 161 and the second lead switch 162, as described in FIG. 3, the first lead switch 161 and the second lead switch 161 Leads inside the two-lead switch 162 are coupled to each other, and a pulse signal may be generated as shown in FIG. 5 each time they are coupled.

That is, as shown in Fig. 5, when the leads are combined, a high signal is transmitted as a pulse signal, and when the magnet is separated from the reed switch 160, the combination of the leads is released and a pulse signal is not generated. , A low signal may be transmitted.

In addition, the controller 200 calculates the number of rotations of the rotating plate based on the state change of the pulse signals, and may calculate the number of rotations by generating a state conversion value from the pulse signals.

Specifically, when the pulse signal received from the first lead switch 161 is High, the controller 200 sets the state conversion value to A, and the pulse signal received from the second lead switch 162 is In the case of High, the state conversion value is B, and when the pulse signal received from the first and second lead switches 161 and 162 is Low, the state conversion value is converted to C. Thereafter, the rotation direction of the rotating plate 210 may be determined based on the sum of A, B, and C (X).

For example, C is 0, and the absolute value of A and the absolute value of B may be real numbers having different values. Specifically, A may be 2 and B may be 1, or A may be 1 and B may be 2. . In FIGS. 6 and 7, for convenience of description, A is 1, B is 2, and C is 0, but it is not limited thereto, and A, B, and C may have various numeric values.

Therefore, when the pulse signal received from the first lead switch 161 is a high signal, the state conversion value is generated as 1, and when the pulse signal received from the first lead switch 161 receives a low signal. The state conversion value is generated as 0, and if the pulse signal received from the second lead switch 162 is a high signal, the state conversion value is generated as 2, and the signal received from the second lead switch 162 is In the case of a low signal, when 0 is generated as a state conversion value, a table as shown in FIG. 6 may be generated.

In addition, the controller 200 can recognize the number of rotations of the forward and reverse directions and the rotation plate based on the sum of the state conversion values. After the magnet 220 passes through the first lead switch 161 in the forward direction, the second lead switch If (162) is passed, since the recognized state conversion value will be 1-3-2-0-1, in this case, it can be recognized that the rotating plate 210 has rotated one turn in the forward direction.

However, if the magnet 220 passes through the second lead switch 162 in the reverse direction and passes through the first lead switch 161, the recognized state conversion value will be 1-0-2-3-1. In this case, the rotating plate ( 210) can be recognized as one rotation in the reverse direction.

That is, as shown in Fig. 7, the 1-3-2-0-1 direction is the forward direction, and each time the number changes in this direction, the +1 is made, and the 1-0-2-3-1 direction is the reverse direction. Whenever the number changes in this direction, if the number is -1, if it becomes +4, it is determined that the rotary plate 210 has rotated one turn in the forward direction, and if it becomes -4, the rotary plate 210 has rotated one turn in the reverse direction. I can judge.

As described above, 1-3-2-0-1 or 1-0-2-3-1, which is the sequence described in FIGS. 6 to 7, is a number that appears when A is 1, B is 2, and C is 0. Is, but is not limited thereto, and may be generated in various patterns depending on which numbers A, B, and C are assigned.

8 to 10 are views for explaining a meter reader 100 including a reed switch according to another embodiment, and FIG. 8 is a magnet 220, a first lead switch 161, and a second lead switch 162 Figure 9 is a diagram showing a pulse signal generated by the interaction of the magnet 220, the first lead switch 161 and the second lead switch 162 based on the pulse signal generated by the interaction A diagram showing the generated state conversion value, and FIG. 10 is a diagram showing a state conversion value generated based on a pulse signal generated by the first lead switch 161 and the second lead switch 162 according to another embodiment. It is a diagram showing the forward and reverse directions.

In the case of FIG. 8, the principle of operation of the meter reader 200 is the same as described in FIG. 5, but positions in which the first and second lead switches 161 and 162 are disposed are different from those in FIG. 5.

That is, in the case of FIG. 5, the first lead switch 161 and the second lead switch 162 overlap the high pulse signal generated by the first lead switch 161 and the second lead switch 162 (d ) May be generated, but in the case of FIG. 8, the first lead switch 161 and the second lead switch 162 are formed by the first lead switch 161 and the second lead switch 162. It may be disposed at a position such that a period in which the periods a, b, and c of the generated high pulse signals do not overlap.

However, in this case, if the principle described in FIGS. 6 to 7 is applied as it is, a problem in which the forward direction and the reverse direction cannot be distinguished may occur.

In other words, since there is no section where the high pulse signal overlaps, it is recognized as 2-0-1-0-2-0-1-0 even if the rotating plate rotates in the forward direction, and 2-0-1- Since 0-2-0-1-0 is recognized, there is a problem in that it is impossible to determine the exact direction of rotation in the forward direction or in the reverse direction in this case.

Therefore, in this case, the control unit 200 can classify this by using the state conversion value of the pulse signal of the first lead switch 161 and the second lead switch 162. Specifically, When the pulse signal is high, the state conversion value is set to A, and when the pulse signal received from the second lead switch 162 is high, the state conversion value is set to B, and the first lead switch 161 and When the pulse signal received from the second lead switch 162 is low and when the state of the pulse signal of the first lead switch 161 is changed (from high to low or from low to high), the state conversion value is changed to C. , When the state of the pulse signal of the second lead switch 162 is changed (from high to low or from low to high), the state conversion value is generated as D, and then the generated A, B, C, and D values are summed. Based on (Y), the direction of rotation of the rotating plate 210 may be determined.

For example, C is 0, the absolute value of A and the absolute value of B may be real numbers having different values, and the absolute value of D is a real number greater than the sum of the absolute value of A and the absolute value of B. Can be

Specifically, A may be 2, B may be 1, D may be 4, A may be 1, B may be 2, D may be 4. In FIGS. 9 and 10, for convenience of description, A is 1, B is 2, C is 0, and D is 4, but it is not limited thereto, and A, B, C, and D may have various numeric values.

Therefore, when the pulse signal received from the first lead switch 161 is high, the state conversion value is 1, and when the pulse signal received from the second lead switch 162 is high, the state conversion value is 2 Low, when the pulse signal received from the first lead switch 161 and the second lead switch 162 is low and the state of the pulse signal of the first lead switch 161 goes from high to low, or from low to high. When the state change value is changed to 0, when the state of the pulse signal of the second lead switch 162 is converted from high to low, or from low to high, the state conversion value is generated as 4, as shown in FIG. Tables can be created together.

In FIG. 9, the forward switch number refers to a state conversion value generated when the rotating plate 210 rotates in the forward direction, and the reverse switch number refers to a state change value generated when the rotating plate 210 rotates in the reverse direction.

Accordingly, the control unit 200 can recognize the number of rotations of the rotating plate and the forward and reverse directions based on the sum of the state conversion values shown in FIG. 9, and the first lead switch 161 in which the magnet 220 is in the forward direction. If passing through the second lead switch 162 after passing, the recognized state conversion value will be recognized as 6-4-1-0-6 as described in the forward sum of FIG. 9. Therefore, in this case, it can be determined that the rotating plate 210 has rotated one turn in the forward direction.

However, if the magnet 220 passes through the second lead switch 162 in the reverse direction and passes through the first lead switch 161, the recognized state conversion value is 6-0-1- It will be recognized as 4-6. Therefore, in this case, it can be determined that the rotating plate 210 has rotated one turn in the reverse direction.

That is, as shown in Fig. 10, the 6-4-1-0-6 direction is the forward direction, and each time the number changes in this direction, +1 is performed, and the 6-0-1-4-6 direction is the reverse direction. Whenever the number changes in this direction, if the number is -1, if it becomes +4, it is determined that the rotary plate 210 has rotated one turn in the forward direction, and if it becomes -4, the rotary plate 210 has rotated one turn in the reverse direction. I can judge.

6-0-1-4-6 or 6-4-1-0-6 1-3-2-0-1 or 1-0-2-3-1 which is the sequence described in FIGS. 9 to 10 As described above, it is a pattern that is created when A is 1, B is 2, C is 0, and D is 4, and it is not limited to these number patterns, and the number of numbers A, B, C, D is assigned to It can be created in a variety of patterns accordingly.

11 to 15 are diagrams for explaining a method of determining when any one of the reed switches fails in the meter reader including the reed switch according to FIGS. 5 to 7.

Specifically, FIG. 11 is a diagram showing a state conversion value generated based on a pulse signal when the first lead switch 161 fails in a high state, and FIG. 12 is a diagram showing a state conversion value generated based on a pulse signal. A diagram showing a state conversion value generated based on a pulse signal when a failure in the (Low) state is shown, and FIG. 13 is a state generated based on a pulse signal when the second lead switch 162 fails in a high state It is a figure showing the conversion value. 14 is a diagram showing a state conversion value generated based on a pulse signal when the second lead switch 162 fails in a low state, and FIG. 15 is a diagram showing a state conversion value generated based on a pulse signal. It is a diagram for explaining a method of determining whether or not a failure of 162). Generating the state conversion value according to the state of the pulse signal has been described in detail in FIG. 5 and will be omitted below.

In general, a reed switch can fail in two states, and it can fail in a state that generates a high signal, or it can fail in a state that generates a low signal.

Therefore, if a failure occurs while the first lead switch 161 generates a high signal, the second lead switch is operating normally and the state conversion value will be generated as 2-0-2-0, but the first lead The state change value of the switch 161 will continue to be generated as 1-1-1-1. Accordingly, the state conversion value of the reed switches 161 and 162 added by the control unit 200 will be recognized as 3-1-3-1.

Conversely, if a failure occurs while the first lead switch 161 generates a low signal, the second lead switch is operating normally and the state conversion value will be generated as 2-0-2-0, but the first lead switch The state transition value of (161) will continue to be generated as 0-0-0-0. Accordingly, the state conversion value of the reed switches 161 and 162 summed by the control unit 200 will be recognized as 2-0-2-0.

In addition, if a failure occurs while the second lead switch 162 generates a high signal, the first lead switch is operating normally, so the state conversion value will be generated as 1-0-1-0, but the first lead The state conversion value of the switch 161 will continue to be generated as 2-2-2-2. Accordingly, the state conversion value of the reed switches 161 and 162 added by the control unit 200 will be recognized as 3-2-3-2.

Conversely, if a failure occurs while the second lead switch 162 generates a low signal, the state conversion value will be generated as 1-0-1-0 because the first lead switch is operating normally, but the second lead switch The state transition value of (161) will continue to be generated as 0-0-0-0. Accordingly, the state conversion value of the reed switches 161 and 162 summed by the control unit 200 will be recognized as 1-0-1-0.

Therefore, when these state transition values are shown as a van diagram as in (b) of FIG. 15, the state transition value when the first lead switch 161 fails in a high state is 3-1-3-1, which is reversed. -It will be recognized as forward-reverse-forward, and when the first lead switch 161 fails in a low state, the state conversion value is 2-0-2-0, which will be recognized as forward-reverse-forward-reverse. will be.

In addition, 3-2-3-2, which is a state conversion value when the second lead switch 162 fails in a high state, will be recognized as forward-reverse-forward-reverse, and the second lead switch 162 is in a low state. In case of failure, 1-0-1-0, which is a state conversion value, will also be recognized as reverse-forward-reverse-forward.

Therefore, if the reed switches 161 and 162 operate normally, they must continue to move in the forward direction or in the reverse direction. As described above, if the direction of the state conversion values continues to change in the forward/reverse direction, the controller 200 will It can be determined that there is a malfunction.

In addition, in detail, the control unit 200 may determine which of the first lead switch 161 and the second lead switch 162 has a failure.

Specifically, the controller 220 can know this based on the difference in the state change value. In the case of FIGS. 13 and 14, the difference value of the magnitude at which the state change value changes is 2 as an absolute value (3-1-3 -1 / 2-0-2-0), in the case of Figs. 15 and 16, the difference value of the magnitude at which the state change value changes is an absolute value of 1 (3-2-3-2 / 1-0-1- It can be seen that it is 0).

Therefore, as shown in (a) of FIG. 15, if the difference between the absolute value of the state conversion value is 2, the control unit 220 may determine that the first lead switch 161 has failed, and the difference between the absolute value If is 1, it may be determined that the second lead switch 162 has a failure.

The difference values 0 and 1 described in FIG. 15 are calculated values because A is 1, B is 2, and C is 0, and these values vary depending on what value A, B, and C are determined. Can be calculated.

For example, referring to characters, if the pulse signal received from the first lead switch 161 is high, the state conversion value is set to A, and the pulse signal received from the second lead switch 162 is In the case of high, the state transition value is B, and when the pulse signals received from the first and second lead switches 161 and 162 are low, the state transition value is calculated as C.

Therefore, in this case, as shown in FIG. 11, when a failure occurs while the first lead switch 161 generates a high signal, the second lead switch is operating normally, so the state conversion value is B-0-B-0. It will be generated, but since the state conversion value of the first lead switch 161 will be continuously generated as AAAA, the state conversion value of the reed switches 161 and 162 summed by the control unit 200 is A+B-A-A+ It will be recognized as B-A.

In the same way, as in FIG. 12, when a failure occurs while the first lead switch 161 generates a low signal, the state conversion value of the reed switches 161 and 162 summed by the control unit 200 is B-0- It will be recognized as B-0.

Therefore, since the state conversion value continues to change into two numbers, and this is the forward/reverse direction calculated alternately, the control unit 200 may determine that the reed switch has failed, and the difference between the absolute values of the state conversion values is shown in FIG. Since both cases in 12 are B, in this case, it can be determined that the first lead switch 161 has failed.

On the contrary, as shown in FIG. 13, when a failure occurs while the second lead switch 161 generates a high signal, the first lead switch is operating normally, so the state conversion value will be generated as A-0-A-0. However, since the state conversion value of the second lead switch 161 will be continuously generated as BBBB, the state conversion value of the reed switches 161 and 162 summed by the control unit 200 is A+B-B-A+B- It will be recognized as B.

In the same way, as shown in FIG. 14, when a failure occurs while the first lead switch 161 generates a low signal, the state conversion value of the reed switches 161 and 162 summed by the control unit 200 is A-0- It will be recognized as A-0.

Therefore, since the state conversion value is continuously changed to two numbers, and the forward/reverse directions are calculated alternately, the control unit 200 can determine that the reed switch has failed, and the difference between the absolute values of the state conversion values is shown in FIGS. Since both cases in 14 are A, in this case, it can be determined that the second lead switch 161 has failed.

16 to 20 are diagrams for explaining a method of determining when any one reed switch fails in the meter reader including the reed switch according to FIGS. 8 to 10.

Specifically, FIG. 16 is a diagram showing a state conversion value generated based on a pulse signal when the first lead switch 161 fails in a high state, and FIG. 17 is a diagram showing a state conversion value generated by the first lead switch 161 A diagram showing a state conversion value generated based on a pulse signal when a failure in the (Low) state is shown, and FIG. 18 is a state generated based on a pulse signal when the second lead switch 162 fails in a high state It is a figure showing the conversion value. FIG. 19 is a diagram showing a state conversion value generated based on a pulse signal when the second lead switch 162 fails in a low state, and FIG. 20 is a diagram showing a state conversion value generated based on a pulse signal. It is a diagram for explaining a method of determining whether or not a failure of 162).

Generation of the state conversion value according to the state of the pulse signal has been described in detail in FIG. 5 and will be omitted. The following state conversion values are 1 for A, 2 for B, 0 for C, and D as described in FIGS. 6 and 7 Is assumed to be 4.

When a failure occurs while the first lead switch 161 generates a high signal as shown in FIG. 16, since the second lead switch is operating normally, the state conversion value will be generated as 2-0-2-0. The state conversion value of the first lead switch 161 will continue to be generated as 1-1-1-1, and the state of the first lead switch 161 does not change, so the state change of the second lead switch 162 D will be generated as 4-4-4-4. Therefore, the state conversion value of the reed switches 161 and 162 summed by the control unit 200 will be recognized as 7-5-7-5.

Conversely, if a failure occurs while the first lead switch 161 generates a low signal as shown in FIG. 17, the second lead switch is operating normally, and the state conversion value will be generated as 2-0-2-0. The state change value of the first lead switch 161 will continue to be generated as 0-0-0-0, and the state of the first lead switch 161 does not change. The resulting D will be created as 4-4-4-4. Accordingly, the state conversion value of the reed switches 161 and 162 added by the control unit 200 will be recognized as 6-4-6-4.

In addition, when a failure occurs while the second lead switch 162 generates a high signal as shown in FIG. 18, since the first lead switch is operating normally, the state conversion value will be generated as 0-1-0-1. The state conversion value of the first lead switch 161 will be continuously generated as 2-2-2-2. And since the state of the second lead switch 161 does not change, D is continuously generated as 0, and the state of the pulse signal of the first lead switch 162 continues to change, but C is 0, so the final sum is 2-3 It will be created as -2-3.

Conversely, if a failure occurs while the second lead switch 162 generates a low signal as shown in FIG. 19, since the first lead switch is operating normally, the state conversion value will be generated as 0-1-0-1. The state conversion value of the 2-lead switch 162 will continue to be generated as 0-0-0-0. And since the state of the second lead switch 161 does not change, D continues to be generated as 0, and the state of the pulse signal of the first lead switch 162 continues to change, but C is 0, so the final sum is 0-1. It will be created as -0-1.

Therefore, if these state transition values are shown in the van diagram as in (b) of FIG. 20, the state transition value 7-5-7-5 when the first lead switch 161 fails in a high state is reverse-forward- It will be recognized as a forward-reverse direction, and 6-4-6-4, which is a state conversion value when the first lead switch 161 fails in a low state, will be recognized as a forward-reverse-forward-reverse direction.

In addition, 2-3-2-3, which is a state conversion value when the second lead switch 162 fails in a high state, will be recognized as forward-reverse-forward-reverse, and the second lead switch 162 is in a low state. In case of failure, the state conversion value 0-1-0-1 will be recognized as reverse-forward-reverse-forward.

Therefore, if the reed switches 161 and 162 operate normally, they must continue to move in the forward direction or in the reverse direction. As described above, the continuous change in the direction of the state conversion values means that the direction of the rotating plate continues to change. In this case, the controller 200 may determine that the reed switch has failed.

In addition, in detail, the control unit 200 may determine which of the first lead switch 161 and the second lead switch 162 has a failure.

Specifically, the control unit 220 can know this based on the difference in the state change value. In the case of FIGS. 16 and 17, the magnitude at which the state change value changes is 2 as an absolute value (7-5-7-5 / 6-4-6-4), in the case of FIGS. 18 and 19, it can be seen that the magnitude at which the state change value changes is 1 (2-3-2-3 / 0-1-0-1) as an absolute value. .

Therefore, as shown in (a) of FIG. 20, if the difference in the absolute value of the state conversion value is 2, the control unit 200 may determine that the first lead switch 161 has failed, and the difference in the absolute value If is 1, it may be determined that the second lead switch 162 has a failure.

The difference values 0 and 1 described in FIG. 20 are calculated values because A is 1, B is 2, C is 0, and D is 4, and these values are calculated as A, B, C, and D. It can be calculated in various ways depending on whether you decide to do so.

For example, referring to characters, if the pulse signal received from the first lead switch 161 is high, the state conversion value is set to A, and the pulse signal received from the second lead switch 162 is In the case of high, the state conversion value is B. When the pulse signal received from the first lead switch 161 and the second lead switch 162 is low, the state of the pulse signal of the first lead switch 161 is changed. In this case, it is assumed that the state conversion value is calculated as C, and when the state of the pulse signal of the second lead switch is changed, the state conversion value is calculated as D.,

Therefore, in this case, as shown in FIG. 16, when a failure occurs while the first lead switch 161 generates a high signal, the second lead switch is operating normally, so the state conversion value is B-0-B-0. It will be generated, but the state conversion value of the first lead switch 161 will be continuously generated as AAAA, and only the state of the pulse signal of the second lead switch 162 will be continuously changed, so the state conversion value will continue to be generated as DDDD. . Accordingly, the sum of the finally recognized state transition values will be recognized as B+A+D-A+D-B+A+D-A+D.

In the same way, as in FIG. 17, when a failure occurs while the first lead switch 161 generates a low signal, the state conversion value of the reed switches 161 and 162 summed by the control unit 200 is B+D − It will be recognized as D-B+D-D.

Therefore, since the state conversion value continues to change into two numbers, and this is the forward/reverse direction calculated alternately, the control unit 200 may determine that the reed switch has failed, and the difference between the absolute values of the state conversion values is shown in FIG. Since both cases in 17 are B, in this case, it can be determined that the first lead switch 161 has failed.

Conversely, as shown in FIG. 18, when a failure occurs while the second lead switch 161 generates a high signal, since the first lead switch is operating normally, the state conversion value will be generated as A-0-A-0. However, the state conversion value of the second lead switch 161 will be continuously generated as BBBB. In addition, only the state of the pulse signal of the first lead switch 162 continuously changes, but the state conversion value in which the state of the pulse signal of the first lead switch 162 changes will continue to be generated as 0-0-0-0. The state conversion value of the reed switches 161 and 162 summed by 200 will be recognized as B-B+A-B-B+A.

In the same way, as shown in FIG. 19, when a failure occurs while the second lead switch 161 generates a low signal, the state conversion value of the reed switches 161 and 162 summed by the control unit 200 is 0-A- It will be recognized as 0-A.

Therefore, since the state conversion value is continuously changed to two numbers, and the forward/reverse directions are calculated alternately, the control unit 200 can determine that the reed switch has failed, and the difference between the absolute values of the state conversion values is shown in FIG. In 19, since both cases are A, in this case, it can be determined that the second lead switch 161 has failed.

20 is a block diagram showing some components of the meter reader 100 including a reed switch according to an embodiment.

Referring to FIG. 20, a meter reader 100 including a reed switch according to an embodiment includes a first lead switch 161 and a second lead switch 162, a first lead switch 161, and a second lead switch ( A sensing unit 170 that detects a pulse signal generated from 162 in real time, and a control unit that determines the rotation direction of the rotating plate 210 and whether or not there is an abnormal operation of the rotating plate 210 based on the result of the detection by the sensing unit 170 (200), when it is determined that a malfunction has occurred in the operation of the rotating plate 210 or the reed switches 161 and 162 as a result of the determination of the control unit 220, a communication unit 180 notifying the external user and a display unit 190 displaying the externally are provided. Can include.

In the case of the reed switch, only the first lead switch 161 and the second lead switch 162 are shown in FIG. 21, but the present invention is not limited thereto, and more than two leads are provided for the meter reader to which the principles of the present invention can be applied. It may include a switch.

The detection unit 170 detects the state of the pulse signal generated by the interaction between the first lead switch 161 and the second lead switch 162 and the magnet 210 in real time, and recognizes a high signal or The detection result may be transmitted to the controller 200 by detecting whether it is a low signal.

The controller 200 may calculate a state conversion value for each of a plurality of reed switches based on the state of the pulse signal, and determine a rotation direction direction of the rotating plate 210 based on the calculated state change value.

Specifically, after summing the state conversion values calculated over time for each of the plurality of reed switches, the rotation direction of the rotating plate 210 may be determined based on the direction of the summed values. A detailed description thereof will be omitted since it has been described with reference to FIGS. 5 to 20.

When it is determined by the control unit 200 that the reed switches 161 and 162 have failed, the communication unit 180 may inform the user's mobile terminal device of information about the current state of the reed switches 161 and 162.

Accordingly, the communication unit 170 transmits information on the reed switches 161 and 162 to the user's mobile terminal device 300 using various wireless communication methods such as Wi-Fi, Bluetooth, wireless communication network, 3G or 4G. I can.

When it is determined by the controller 200 that the reed switches 161 and 162 have failed, the display unit 190 may externally display information on the current state of the reed switches 161 and 162.

Accordingly, the display unit 190 may include a display panel (not shown) for expressing this, and the display panel includes a cathode ray tube (CRT) display panel, a liquid crystal display (LCD) panel, A light emitting diode (LED) panel, an organic light emitting diode (OLED) panel, a plasma display panel (PDP), a field emission display (FED) panel, etc. can be used. I can. When the display unit 190 is implemented as a touch display, the display unit 190 may include a touch display panel (not shown) for receiving a user's input.

22 is a flowchart illustrating a method of controlling the meter reader 100 including a reed switch according to an exemplary embodiment.

Referring to FIG. 22, the meter reader 100 may sense a pulse signal generated while the reed switch 160 passes through the magnet 210 in real time. (S10)

Thereafter, a state conversion value may be generated for each reed switch 160 based on the state of the detected pulse signal. (S20)

The method of generating the state conversion value may be variously generated according to the position where the reed switch 160 is disposed, and a detailed description thereof will be omitted, as described above.

When the state conversion value is generated, the state conversion values are summed for each reed switch 160, and then it may be determined whether the state conversion value changes according to a predetermined order. (S30)

The predetermined order varies depending on the number of the state conversion values generated.In the case of FIG. 7, the 1-3-2-0-1 direction is a predetermined direction, and the state conversion value is 1-3-2-0. If it changes to -1, it can be determined that it operates in the forward direction. (S40)

In addition, although not shown in the drawing, if it changes from 1 to 3, it can be determined that it rotates once in the forward direction, and if it changes from 3 to 2, it can be determined that it has rotated in the forward direction once more. Therefore, it can be determined that the rotation plate 210 has rotated a total of 1 rotation in the forward direction a predetermined number of times, for example, as shown in FIG. 7.

However, if the state conversion value changes to 1-0-2-3-1, which is the opposite direction to 1-3-2-0-1, it is determined that it operates in the reverse direction, and it can be notified to the user (S50, S60). )

So far, a control method of the meter reader 100 including the reed switch and the meter reader 100 including the reed switch according to an exemplary embodiment has been described.

In the case of the prior art, a meter reader including a reed switch is provided with only one reed switch 30 as a path through which current can flow, and if the reed switch fails, the operation of the mechanical device and system may be stopped or a safety problem may occur. There was a problem that reliability was poor due to concern.

Also, in the case of a meter reader including a reed switch, when the rotating plate rotates one turn in the forward direction, it is counted and displayed to the outside. There was a problem to do.

However, in the case of the control method of the meter reader including the reed switch and the meter reader including the reed switch according to an embodiment, it is possible to accurately know whether the rotating plate rotates in the reverse direction compared to the existing technology, thereby improving the performance of the meter reader. Even if only two switches are used, the same effect can be obtained as in the case of using three reed switches, so it is possible to manufacture a meter more economically than a conventional meter reader, and the effect of efficiently using the space inside the meter reader. exist.

In addition, even when two reed switches are attached close to each other or manufactured far apart depending on the situation of the product, since the operation and control are performed differently depending on the case, there is an effect of accurately knowing the rotation direction of the rotating plate and whether there is a failure.

In addition, in the meter reader using two reed switches, when a failure occurs in one meter and does not operate normally, unlike the prior art, there is an effect of accurately determining this and notifying the user of the current state of the reed switch.

Although the embodiments have been described with reference to limited embodiments and drawings, various modifications and variations are possible from the above description to those of ordinary skill in the art. For example, the described techniques are performed in a different order from the described method, and/or components such as a system, structure, device, circuit, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved. Therefore, other embodiments and claims and equivalents fall within the scope of the claims to be described later.

100: meter reader
160: reed switch
161: first lead switch
162: second lead switch
170: detection unit
180: communication department
190: display unit
200: control unit

Claims (23)

Rotating plate;
A magnet disposed on one surface of the rotating plate;
A first lead switch and a second lead switch;
After generating a state conversion value based on a state of a pulse signal generated by an interaction between the first and second lead switches and the magnet, the first lead switch and the first lead switch based on the generated state conversion value A meter reading device comprising a; a control unit for determining whether the second lead switch malfunctions. The method of claim 1,
The control unit,
After summing the state transition values for each of the first and second lead switches over time, a meter reader that determines whether the first and second lead switches malfunction based on the directionality of the summed values . The method of claim 2,
The first lead switch and the second lead switch are disposed within a first distance, and the first distance is a period of a high pulse signal by the first lead switch and a high pulse by the second lead switch. A meter reader that is a distance arranged so that at least some of the sections of the signal overlap. The method of claim 3,
The control unit,
When the pulse signal of the first lead switch is high, the state conversion value is A, when the pulse signal of the second lead switch is high, the state conversion value is B, and the first lead When the pulse signal of the switch and the second lead switch is low, the state conversion value is converted to C, and then the first and second lead switches and the second lead switch are based on the sum of A, B, and C (X). A meter reader that determines the malfunction of the reed switch. The method of claim 4,
The C is 0, and the absolute value of A is a real number having a value smaller than the absolute value of B. The method of claim 5,
The control unit,
When the value of X is continuously repeated as two values, the meter reader determines that one of the first and second lead switches has failed. The method of claim 6,
The control unit,
If the difference between the absolute values of the two values is the same as A, it is determined that the second lead switch has failed, and if the difference between the absolute values of the two values is the same as the B, it is determined that the first lead switch has failed. Meter reader. The method of claim 2,
The first and second lead switches are disposed beyond a second distance, and the second distance is a period of a high pulse signal by the first lead switch and a high pulse signal by the second lead switch. ) A meter reader, which is a distance arranged so that there is no overlapping section of the pulse signal. The method of claim 8,
The control unit,
When the pulse signal of the first lead switch is high, the state conversion value is A, when the pulse signal of the second lead switch is high, the state conversion value is B, and the first lead When the pulse signal of the switch and the second lead switch is low and the state of the pulse signal of the first lead switch is changed, the state conversion value is C, and when the state of the pulse signal of the second lead switch is changed. After the state conversion value is set to D, the meter reader determines whether the first and second lead switches are malfunctioning based on the sum of the A, B, C, and D values (Y). The method of claim 9,
Wherein C is 0, the absolute values of A, B and D have different values, and the absolute value of D is a real number greater than the sum of the absolute value of A and the absolute value of B. The method of claim 10,
The control unit,
A meter reader configured to determine that one of the first and second lead switches has failed when the Y value is continuously repeated as two values. The method of claim 11,
The control unit,
If the difference between the absolute values of the two values is the same as A, it is determined that the second lead switch has failed, and if the difference between the absolute values of the two values is the same as the B, it is determined that the first lead switch has failed. Meter reader. The method of claim 1,
When it is determined that the reed switch has failed, a meter reader further comprising at least one of a display unit for externally displaying information on a current state of the reed switch and a communication unit notifying a user. The method of claim 10,
The control unit,
When it is determined that the first or second lead switch has failed, the meter reader controls the operation of the meter based on a normally operated reed switch. Calculating a state conversion value for each of the plurality of reed switches based on the state of the pulse signal generated by the interaction between the first and second lead switches coupled to the rotating plate and the magnet;
Summing the state conversion values for the first and second lead switches over time, respectively; And
And determining whether a first lead switch and a second lead switch of the rotating plate malfunction based on the directionality of the summed value. The method of claim 15,
The first lead switch and the second lead switch are disposed within a first distance, and the first distance is a period of a high pulse signal by the first lead switch and a high pulse by the second lead switch. A method for controlling a meter reader, which is a distance arranged so that at least some of the signal sections overlap. The method of claim 16,
The step of determining whether the first lead switch and the second lead switch malfunction or not,
When the pulse signal of the first lead switch is high, the state conversion value is A, when the pulse signal of the second lead switch is high, the state conversion value is B, and the first lead In case the pulse signal of the switch and the second lead switch is low, converting the state conversion value to C, and then determining based on the sum of A, B and C (X),
C is 0, and the absolute value of A has a value smaller than the absolute value of B. The method of claim 17,
The step of determining whether the first lead switch and the second lead switch malfunction or not,
And determining that one of the first lead switch and the second lead switch has failed when the value of X is continuously repeated as two values. The method of claim 18,
The step of determining whether the first lead switch and the second lead switch malfunction or not,
When the difference between the absolute values of the two values is the same as A, it is determined that the first lead switch has failed, and when the difference between the absolute values of the two values is the same as the B, it is determined that the second lead switch has failed. Control method of a meter reading device comprising the step of. The method of claim 15,
The first lead switch and the second lead switch,
The first and second lead switches are disposed beyond a second distance, and the second distance is a period of a high pulse signal by the first lead switch and a high pulse signal by the second lead switch. ) A control method of a meter reader, which is a distance arranged so that there is no section where the section of the pulse signal overlaps. The method of claim 20,
The step of determining whether the first lead switch and the second lead switch malfunction or not,
When the pulse signal of the first lead switch is high, the state conversion value is A, when the pulse signal of the second lead switch is high, the state conversion value is B, and the first lead When the pulse signal of the switch and the second lead switch is low and the state of the pulse signal of the first lead switch is changed, the state conversion value is C, and when the state of the pulse signal of the second lead switch is changed. After the state conversion value is set to D, it includes the step of determining whether the reed switch malfunctions based on the sum of A, B, C, and D (Y),
Wherein C is 0, the absolute values of A, B and D have different values, and the absolute value of D is a real number greater than the sum of the absolute value of A and the absolute value of B. The method of claim 21,
The step of determining whether the first lead switch and the second lead switch malfunction or not,
And determining that one of the first lead switch and the second lead switch has failed when the value of Y is continuously repeated as two values. The method of claim 22,
The step of determining whether the first lead switch and the second lead switch malfunction or not,
When the difference between the absolute values of the two values is the same as B, it is determined that the first lead switch has failed, and when the difference between the absolute values of the two values is the same as the A, it is determined that the second lead switch has failed. Control method of a meter reading device comprising the step of.

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