JPH10213259A - Solenoid valve control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve control system with improved operability for controlling plural solenoid valves independently. SOLUTION: A solenoid valve control system comprises plural solenoid valves B1, B2,..., Bn adapted to keep opening by their mechanical self-holding; a commander means 11 for outputting information signals composed of codes including address bits for use in specifying some of the plural solenoid valves B1 to Bn and including data bits for use in commanding the specified solenoid valves to open or close; a transmitter means 12 for converting the parallel information signals outputted from the commander means 11 into serial information signals and outputting the serial information signals and power signals both time-shared; plural receiver means F1, F2,..., Fn arranged for the respective solenoid valves B1, B2,..., Bn for charging a power source on the basis of the power signals transmitted thereto from the transmitter means 12 and for converting the received serial signals into parallel signals and comparing the parallel signals with set data peculiar to the solenoid valves to actuate them; and two wirings 13 and 14 for connecting parallel the plural receiver means F1 to Fn to the single transmitter means 12 in pairs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve control system for controlling the opening and closing of a plurality of solenoid valves installed in a wide area.

[0002]

2. Description of the Related Art It is necessary to water a paddy field in a field where agricultural products are produced, for example, in rice cultivation. Actuated solenoid valve control systems have been developed. In particular, in a paddy field having a large field area with a large plot, a water tap provided with an electromagnetic valve is provided in some places of the paddy field so that water does not dry up locally due to undulation or inclination of the ground. 2. Description of the Related Art Irrigation facilities are provided with an electromagnetic valve control system that supplies agricultural water to a field from a water pipe buried by opening and closing. An example of such a thing is Japanese Utility Model 63-1030.
No. 75 can be mentioned.

[0003] This publication discloses an irrigation system which is provided in a field having a large number of ridges and which can be remotely supplied with water. In the field, a water supply pipe connected to a water source is provided, and a plurality of water discharge valves for supplying water to ridges are attached to an outer peripheral wall of the water supply pipe. The water discharge valve is a diaphragm valve that opens and closes with an air pressure.
The position is adjusted by operating a double solenoid type solenoid valve (hereinafter simply referred to as a solenoid valve). This solenoid valve is provided in each of a plurality of receiving boxes provided in the field, and adjusts the air pressure of several water discharge valves by one solenoid valve, by a control signal transmitted from the controller, Several water discharge valves are used as one block, and the blocks 1 to 4 are controlled to operate alternately.

[0004] Therefore, in order to control the solenoid valve for opening and closing such several blocks of water discharge valves, first, a control signal is sent from a transmission circuit of a controller to a reception circuit in a reception box. In the transmission circuit, different frequency signals are output by a frequency divider that receives a system clock from a clock source, and two or more frequency multiplexed signals obtained by adding one or more through a summing circuit are DC-biased and output. . FIG. 14 is a waveform diagram showing a frequency multiplexed signal output from such a transmission circuit. Then, in the receiving circuit receiving such a frequency multiplexed signal, a driving signal for driving the electromagnetic valve by extracting the leading edge and the trailing edge of the frequency multiplexed signal is obtained. That is, in the frequency multiplexed signal, a voltage rectified through a diode is charged into a capacitor as a power supply for driving an electromagnetic valve, and a pulse signal A formed as shown in FIG. Based on
Control signals such as signals D and E are obtained from the delayed signals B and A and the signal C having the same phase as shown in FIG. Then, when the driving power charged due to the output of the control signal E is applied to one of the solenoids, the air flow from the air tube is shut off and the water discharge valve is opened,
When the drive power charged due to the output of the control signal D is applied to the other solenoid, the air flow from the air tube flows again and the water discharge valve closes.

[0005]

However, such a conventional solenoid valve control system has the following problems. That is, in the conventional solenoid valve control system,
A control signal for driving the solenoid valve is extracted by extracting a leading edge and a trailing edge of the frequency multiplexed signal sent from the transmission circuit.
Control signals D and E shown in FIG. 15 are formed. for that reason,
It is necessary to keep sending a signal during water supply, and irrigation time may be several tens of hours or even several days when it is long, and the power consumption is very large, which is not preferable in terms of cost. Further, since the conventional solenoid valve control system divides a plurality of water discharge valves into several blocks and sequentially opens and closes each block in a fixed cycle, any number of tens of solenoid valves can be controlled. Not something.

Accordingly, an object of the present invention is to provide a solenoid valve control system which is excellent in operability and capable of independently controlling a plurality of solenoid valves.

[0007]

A solenoid valve control system according to the present invention specifies an electromagnetic valve that maintains an open state by mechanically self-holding the valve, and identifies each electromagnetic valve among a large number of the electromagnetic valves. Command means for outputting an information signal composed of a code including an address bit and a data bit for instructing opening and closing of the solenoid valve; and the information signal and the power signal obtained by converting a parallel signal output from the command means into a serial signal. Transmitting means for dividing the output signal in a time-division manner, and a power supply provided for each of the solenoid valves, charging a power supply with a power signal sent from the transmitting means, extracting the serial signal, and converting the parallel-converted information signal into a specific information for each solenoid valve. Receiving means for operating the solenoid valve by comparing with the setting data of the above, and the plurality of receiving means are connected in parallel to one transmitting means by two wires. The features.

Further, in the solenoid valve control system according to the present invention, the transmission means has P / S conversion means for converting the information signal into a serial signal by forming two kinds of pulse waves having different widths, It is preferable that the receiving means has S / P conversion means for converting a serial signal transmitted from the transmitting means into a parallel signal by a pulse width. Further, in the solenoid valve control system according to the present invention, it is preferable that the receiving means forms a circuit in which a rectifier is connected to an input terminal.

Further, the solenoid valve control system according to the present invention has a detecting means for detecting, by a current flow, that the transmitting means drives the solenoid valve according to the transmitted information signal, When the detection means detects the flow of the current, it is desirable to output the drive maintenance power supply as a continuous signal. In the solenoid valve control system according to the present invention, it is desirable that a solar battery and a battery be used as the power source.

[0010]

Next, an embodiment of a solenoid valve control system according to the present invention will be specifically described. In particular, the solenoid valve control system according to the present embodiment is used for an irrigation facility as in the above-described conventional example. First, an irrigation facility for a paddy field using the solenoid valve control system will be described. FIG. 1 is a schematic diagram of a pipeline showing a water management demonstration farm in a large section. In this verification test, 1.6 ha and 2.0 ha
Paddy fields A and B having an area of about ha were used. In the paddy field, a water pipeline 1 is buried along the line of the paddy field so that agricultural water can reach each paddy field, and a water supply pipeline branched from the water pipeline 1 for each paddy field is buried. Here, the water supply pipelines 2a and 2b are in paddy fields A and
It is provided along the ridge of B. The water supply pipelines 2a, 2b are provided with a plurality of water taps 3, 3,... For discharging water to paddy fields.

On the other hand, a plurality of drainage plugs 4, 4... Are provided in the central ridge between the paddies A and B, while the water supply plugs 3, 3. ing. The drain plugs 4 are drainage channels 5 buried under the ridges between paddy fields A and B.
And the drainage channel 5 is connected to a water level adjusting basin 6,
Further, the water level adjusting basin 6 is fed to the water supply pipeline 2b by the feed pipe 7
Connected through. Further, culvert water collecting pipes 8, 9 are connected to the water supply pipeline 2a of the paddy field A and the feed pipe 7 of the paddy field B via a water control valve. In the paddy fields A and B provided with such irrigation facilities, there is provided an outdoor self-contained on-site control panel 10 for driving and controlling the water taps 3, 3,... And the drain taps 4, 4,. The on-site control panel 10 includes a hydrant 3,
.. And drain plugs 4, 4,... Each constitute a control unit for remotely controlling an electromagnetic valve (not shown), and include a solar battery.

Next, an outline of the solenoid valve control system will be described. FIG. 2 is a conceptual diagram showing an embodiment of the solenoid valve control system. The solenoid valve control system according to the present embodiment is used in a wide space as shown in FIG. 1, and controls the opening and closing of a plurality of solenoid valves B1, B2,. The solenoid valves B1, B2,.
Is a self-holding solenoid valve, the details of which will be described later.
Each of the solenoid valves B1, B2,.
, Cn, and the receivers C1, C2,.
n is connected via a transmitter 12 to a program controller 11 which issues an operation command for the solenoid valves B1, B2,..., Bn.

Each transmitter 12 has a solenoid valve B1, B
, Bn receivers F1, F2,.
3 and 14 are wired in parallel. The electric wires 13 and 14
.., Bn are also used to transmit information signals and power supply signals. For this, a normal electric wire is used without using a special shielded wire. On the other hand, the program controller 11 includes a DC power supply 15 serving as a drive power supply for the solenoid valves B1, B2,.
Is connected. Therefore, the on-site control panel 10 provided outside the field includes a program controller 11 and a transmitter 12,
The DC power source 15 includes a solar battery and a battery. And, in this site control panel 10,
Terminal box 1 provided with receivers F1, F2... Fn
, And drain plugs 4, 4... (More precisely, an electromagnetic valve and an electromagnetic pump, which will be described later) are connected by a steel corrugated cable.

Next, a specific configuration of the irrigation equipment of the paddy field using the solenoid valve control system will be described.
FIG. 3 is a schematic diagram of a paddy field showing a cross section of the paddy field B and a cross section of the water level adjusting basin 6. The water level adjusting basin 6 is divided into two tanks, a water storage tank 21 and a drain tank 22. A pump 23 is provided in the water storage tank 21, and a pipe branched in three directions is connected to the pump 23. One of them is to the paddy field A via a return valve (not shown), and the other is a return valve 24.
And the other one is connected to a drainage tank 22 through a drainage valve 25. In the water storage tank 21, the feed pipe 7 is connected to the water supply pipeline 2b. In addition, piping for refilling the water storage tank 21 is provided from the water pipeline 1 via a tank supply valve 26. The return valve 24, the drain valve 25, and the tank replenishment valve 26 are connected to the program controller 1, and the pump 23 installed in the water level adjusting basin 6 is connected to the 200 V three-phase AC power supply 31 via a circuit breaker and a relay. It is connected. The pump 2 receives a command from the program controller 11 based on a detection signal of a water level detector 27 installed in the water storage tank 21.
3 and the like are driven to control the flow of water as indicated by arrows in the figure.

On the other hand, water level sensors 31, 31... For detecting water levels are installed at various places in the paddy field, and are connected to the program controller 11. The water level sensors 31, 31,... Are provided near the drain plugs 4, 4,. Generally hydrant 3,
3 and the drain plugs 4, 4 are provided separately on the upstream side and the downstream side of the paddy field, and are often separated by 100 m or more. As shown in FIG. 1, a water tap 3 is formed on a pipe connected to the water supply pipeline 2b and protruding from the surface of the field. The water taps 3, 3,... Are integrally provided with self-holding solenoid valves B1, B2,.
The solenoid valves B1, B2,.
, F2,..., Fn are provided in a one-to-one correspondence, and water is supplied to each of the water taps 3, 3,.

A plurality of drain plugs 4, 4... Are provided in the paddy field, and the water level of the paddy field is adjusted by draining water to the water level adjusting basin 6 side. The drain plugs 4, 4,...
As shown at 0, electromagnetic pumps and electromagnetic valves for driving the drain plugs 4, 4,... Are connected to predetermined receivers F1, F2,. The receivers F1, F2,..., Fn are connected to the program controller 11 via a transmitter 3 connected to a solar battery 32 and a 30V battery 33 as a power source. Further, a display operation unit 34 is connected to the program controller 11. Therefore, in a paddy field provided with such an irrigation facility, the program controller 11 which has received a signal from the water level sensor 31, 31,... Open it,
On the other hand, the solenoid valves B1, B2,..., Bn, etc. are controlled so as to open predetermined drain plugs 4, 4,. In particular, in the present embodiment, it is possible to drive any water tap 3 or drain tap 4 as a target, which will be specifically described below.

The control system according to the present embodiment specifies and operates one of a plurality of solenoid valves B1, B2,..., Bn wired with two electric wires as described above with reference to FIG. . Also, each solenoid valve does not have its own power supply. Therefore, from the transmitter 12 side, a power signal and specific solenoid valves B1, B2,.
The information signal designating n is transmitted to the receivers F1, F2,..., Fn. At this time, a method is employed in which bit data (information signal) from the program controller 11 is converted into a serial signal, and a power signal continuously output there is divided in time and transmitted. Specifically, it is as follows. FIG. 4 is a waveform diagram transmitted by the present control system. This is based on the transmission command of the program controller 11, which is transmitted from the transmitter 12 to the receivers F1, F2,.
n is a signal transmitted to n. The signal is the first 0.5
Power signals for operating the receivers F1, F2... Fn for the second, an information signal having information for instructing each solenoid valve B1, B2.
Or a power signal for operating the drain plugs 4, 4... (Water taps 3, 3,.
(About 0 seconds) are sequentially transmitted as a series.

In this embodiment, the information signal is one word and one word.
The data is transmitted from the program controller 11 to the transmitter 12 as a 2-bit configuration, converted into a serial signal by the transmitter 12, and transmitted to the receivers F1, F2,. Here, FIG. 5 is a diagram showing an information signal. Information signal is 1
It is composed of two bits, and the first four bits are assigned codes for calling this system (C1 to C4). Addresses (A1 to A6) are assigned to the next 6 bits. Data (D1, D2) for an opening / closing command is assigned to the last two bits.
The code bit is unique and enhances the reliability of transmission, and at the same time, has a unique name for this system. Address (A1
A6) is used for assigning the numbers of the water taps 3, 3,... And the drain taps 4, 4,. FIG. 6 shows the bit contents of the data signal. At the end of such an information signal, a code (P) for parity check is provided. Therefore, 1
Transmission is confirmed by adding 0 when 2 bits are odd and adding 1 when even, so that all 13 bits are odd, thereby preventing malfunction due to noise or the like.

Incidentally, it is certain that various restrictions are imposed in adopting this method. That is, since the power signal and the information signal are transmitted in a time-separated manner,
During information transmission, the solenoid valve is not operated, and many solenoid valves B
The operation of 1, B2,..., Bn takes too much time. Therefore, a self-holding type solenoid valve that opens instantly when mechanically self-holding and maintains the same even after the power is turned off is used. In this case, it takes only about 1.5 seconds to complete the operation of one solenoid valve. For example, to operate 40 solenoid valves, the operation can be completed in about 1 minute, and there is almost no problem. On the other hand, it takes about 90 seconds for each of the drain valves 4, 4,... As described later to raise and lower the bellows-type valves. However, if the object of use is a paddy field, this time is considered to be an allowable range. That is, in a paddy field, since the operation frequency is extremely low, about once a day for the water taps 3, 3,... And about 10 times a year for the drain plugs 4, 4,. That doesn't matter.

Next, according to a transmission command from the program controller 11, a transmitter 12 for transmitting a serial signal
The operation of will be described. FIG. 7 is a circuit diagram showing the transmitter 12. First, the transmitter 12 includes the receivers F1, F2,.
Are installed at a distance and are connected by two electric wires, so that an asynchronous type is adopted. The information signal output in parallel from the program controller 11 is converted into a serial signal by the transmitter 12 and output. The bit signals of “0” and “1” are determined by the pulse width of the serially converted signal. Be distinguished. FIG. 8 is a waveform diagram showing the distinction between a "0" signal and a "1" signal converted to a serial signal. As shown in the figure, a is the time for one division of a 1-bit signal into four, and H is a
A signal in which L is time-divided at a rate of 3a time is "0", while a signal in which H is 3a and L is time-divided at a rate of a is "1". Therefore, the clock that becomes the fundamental frequency is important, but since the divided time difference is provided large, sufficient stability can be obtained with the CR type without using a crystal for oscillation of the clock.

In the transmitter 12, the clock frequency is basically a and 4a constitutes one bit, which is converted into a serial signal corresponding to 12-bit information and transmitted.
A power signal for operating the capacitors of the receivers F1, F2,... Fn is transmitted for about 0.5 second immediately before transmitting the serial signal as described above, and an electromagnetic valve after the serial signal is transmitted as described later. A power signal for operating B1, B2,..., Bn, etc. is transmitted for about 0.2 seconds.
FIG. 9 is a waveform diagram showing an example of the serial transmission waveform. The transmitter 12 is provided with a timing pulse generator 41 of a 14-stage flip-flop for generating all the timers corresponding to each signal in order to generate such a time-divided serial signal. I have. The timing pulse generator 41 converts the information signal from the program controller 11 from a parallel signal to a serial signal.
It is connected to the shift register 42.

A power supply 43 is connected to the DC power supply 15, and the power supply 43 is connected to the program controller 11. The program controller 11 is also connected to a start holding circuit 44 that starts the oscillation of the clock of the timing pulse generator 41. Further, a logic circuit 45 for generating the serial signal shown in FIG. 9 at the fundamental frequency a is connected to the timing pulse generator 41 and the P / S shift register 42. The logic circuit 45 is connected to the receivers F1, F2,... Fn via a power amplifier 46, and the output circuit is provided with a relay 47. The output circuit is provided with a current detection resistor RI, and an operation detection amplifier 48 connected to the current detection resistor RI is connected to the start holding circuit 44 and the logic circuit 45.

Therefore, the transmitter 12 having such a configuration is
It works as follows. When a start one-shot signal is input from the program controller 11 to the start holding circuit 44, the reset of the timing pulse generator 41 is released, and the relay 47 is turned on. The timing pulse generator 41 outputs a continuous signal for 0.5 seconds at the start when the reset is released. The logic circuit 45 is configured so that the continuous signal has priority. Also, a 12-bit information signal as shown in FIG.
Are input in parallel. The P / S shift register 42 sequentially shifts every four clocks at a intervals by a clock oscillated from the timing pulse generator 41 and outputs it to the logic circuit 45. When the output from the P / S shift register 42 is "0", a pulse width a is formed, and when the output is "1", a waveform (see FIG. 8) having a pulse width 3a is formed and output by the logic circuit 45. The serially converted signal is amplified and output by the power amplifier 46.

The serial signal transmitted in this manner is supplied to each receiver F by a power signal as described later.
, F2,..., Fn are charged to the power supply voltage of the receiver, and the predetermined receivers F1, F2,.
n is operated. At that time, the solenoid valves B1, B
2,..., Bn are detected by detecting the current detection resistor RI
By reading the current. This can be easily detected because the circuit current of the receivers F1, F2... Fn is low, while the current difference when the solenoid valves B1, B2. Therefore, when a current due to the operation of the solenoid valves B1, B2,..., Bn is detected, the operation detection amplifier 48 immediately switches to a continuous signal of the logic circuit 45, and the power signal is transmitted through the power amplifier 46. Amplified and output.

Since the solenoid valves B1, B2,..., Bn are of the self-holding type, they open instantaneously and reduce the current.
When the operation detecting amplifier 48 detects it again, the start holding circuit 44 is turned off and one transmission is completed. Then, a signal indicating the completion is input from the start holding circuit 44 to the program controller 11, and the next information signal is transmitted by the program controller 11, and the serial signal is similarly transmitted from the transmitter 12 to the receivers F1, F
2 ... transmitted to the Fn side.

Next, the configuration and operation of the receivers F1, F2,..., Fn that have received such an information signal will be described. FIG. 10 is a circuit diagram showing a receiver and a mechanism of an electromagnetic valve and a drain cock of a water tap connected to the receiver.
A bridge type rectifier 52 is connected to the terminals 51a and 51b wired to the transmitter 12 by the two electric wires 13 and 14 so that the polarity can be ignored. The rectifier 52 has a capacitor C1 via a diode D1.
And a power supply unit 53 for taking out the DC power charged in the capacitor C1 is connected. The capacitor C1 is sufficiently charged by a power signal transmitted for about 0.5 seconds at the time of start, and a capacitor having a sufficient capacity is used so as not to be changed by a subsequent pulse signal. The circuit current needs to be as small as possible in order not to increase the capacitance of the capacitor C1.
This circuit aimed at 10 mA or less.

The receiver Fn is connected to a photocoupler 54 for extracting a transmitted serial signal (information signal) and a waveform shaping circuit 55 having a filter and a smit operation. The waveform shaping circuit 55 is connected to an S / P (serial / parallel) shift register 56 that converts a serial signal into parallel. The S / P shift register 56 has a counter 58 connected to an oscillator 57 that starts a clock having a fundamental frequency a.
The one-shot circuit 59 connected to the waveform shaping circuit 55 is connected to the counter 58. Further, the S / P shift register 56 stores a parallel signal output from the S / P shift register 56 and a code in which the respective receivers F1, F2,... Fn store unique address numbers for the water taps 3, 3,. A determination circuit 61 for comparing the value with the value of the setting device 60 is connected. The S / P shift register 56 is also connected with a parity check circuit 62 for checking the transmitted serial signal.

A one-shot circuit 64 is connected via a power amplifier 63 to an electromagnetic valve Bn provided corresponding to the receiver Fn. The one-shot circuit 64 is connected to the discriminating circuit 61 and outputs a signal for 100 ms when the address number matches the address number of the faucet 3.
Are generated. On the other hand, the receiver Fn is provided with a corresponding drain plug 4.
The drain plug 4 opens and closes the bellows 4 a by a cylinder 65, and the cylinder 65 is
The pump is driven by the water pressure of the water pumped by the pump 6, and solenoid valves 67 and 68 are used to adjust the water pressure. The logic valves 7 and 68 and the electromagnetic pump 66 are connected to the logic circuit 7 via a power amplifier 69.
0 is connected. The logic circuit 70 is connected to the discriminating circuit 61 and the counter 58, and outputs the discriminating circuit 61 when the address number matches the address number of the drain plug 4.
The logic circuit 70 outputs a frequency of 30 Hz to the power amplifier 69 in response to a signal from the power amplifier 69. In addition, limit switches 71 and 72 for detecting the operation of the cylinder 65 are connected to the logic circuit 70.

Therefore, in the receiver Fn having such a configuration, a power signal transmitted for 0.5 seconds at the time of start is input, and the capacitor C1 is charged with DC power. This is used as a power source for the receiver Fn that is driven thereafter. Then, a serial signal carrying information transmitted following the power signal is taken out by the photocoupler 54,
The waveform shaping circuit 55 processes noises and guidance disturbances picked up during wiring. The serial signal output from the waveform shaping circuit 55 is input to the S / P shift register 56, where "0" and "1" are determined, and a parallel signal is output. The determination of “0” or “1” is performed by counting the pulse width of the serial signal and the number of clocks of the pulse width a oscillated from the oscillator 57 in the same manner as in the transmitter 12.

When a pulse is output from the waveform shaping circuit 55, a short pulse is oscillated from the one-shot circuit 59 and the counter 58 is reset. Then, the S / P shift register 56 is shifted at the rising edge of the next pulse.
The determination signal of either “0” or “1” is output from the counter 58 depending on whether “a” or “a”.

The serial signal input to the S / P shift register 56 is converted into a parallel signal and output in parallel.
The signal output here is returned to the 12-bit information signal input from the program controller 11 to the transmitter 12 as shown in FIG. At this time, it is confirmed whether or not the information signal transmitted from the transmitter 12 has been reliably transmitted. That is, the S / P shift register 5
6 is checked by the parity check circuit 62. If the code data is odd in number, the discriminating circuit 61 is operated. If the code data is even, the discriminating circuit is not transmitted properly. A determination signal is output so as not to operate 61. If the code data is transmitted correctly and matches the address number for the hydrant 3 stored in the code setting device 60,
One-shot circuit 6 according to data codes D1 and D2
The 100 ms pulse signal output from 4 is applied to the solenoid valve Bn via the power amplifier 63, and the operation of the solenoid valve Bn opens or closes the water tap 3 (not shown).

Here, the power amplifier 63 is a self-holding power amplifier constituted by a transistor bridge circuit as shown in FIG. Therefore, for example, when opening the solenoid valve Bn, the transistors Tr3 and Tr2 are turned on by the ON pulse output from the one-shot circuit 64, and a positive pulse is generated from the power amplifier 63, and the solenoid valve Bn is opened as described later. State.

On the other hand, if the transmitted code data matches the address number of the automatic drain plug 4 stored in the code setting unit 60, a pulse of 30 Hz frequency is output from the logic circuit 70 according to the data codes D1 and D2. The voltage is applied to the electromagnetic pump 66 via the amplifier 69. Also, predetermined pulses are applied to the solenoid valves 67 and 68 from the logic circuit 70. Therefore, the water discharged from the electromagnetic pump 66 is supplied to the cylinder 65 through the electromagnetic valve 67, and the bellows 4a is lifted and opened or pushed down and closed by the cylinder 65 driven by the water pressure. . The operation of the cylinder 65 is detected by the limit switches 71 and 72, and when the piston moves to the detection position, the operation is turned off by the logic circuit 70 which has confirmed the movement.

Next, the water tap 3 which operates according to the information signal transmitted to the receiver Fn as described above will be described.
First, a self-holding type solenoid valve will be described with reference to the sectional view shown in FIG. When DC power is input to the solenoid valve Bn as described above, a positive voltage is applied to the coil 81,
Since the generated magnetic field matches the magnetic field direction of the permanent magnet 82 built in the solenoid valve Bn, the plunger 83 is attracted upward. Therefore, the water flows from the input port 86 to the output port 87 with the valve body 84 separated from the valve seat 85. Further, as described above, the pulse signal is applied only once, but after the application, the plunger 53 is kept in the raised state by the magnetic force of the permanent magnet 82. On the other hand, when a negative pulse signal is applied to the solenoid valve Bn, the magnetic field generated in the built-in coil 81 and the magnetic field of the permanent magnet 82 repel each other, and as a result, are released from both magnetic forces.
The valve body 84 abuts on the valve seat 85 by being urged downward by the spring 88, and the flow path is shut off.

Next, the water tap 3 will be described with reference to the sectional view shown in FIG. The water tap 3 constitutes a diaphragm valve, and its diaphragm chamber 91 is connected to an input port 86 of the solenoid valve Bn by a pipe (not shown) connected to a water discharge faucet 92. When the solenoid valve Bn is closed, water that has risen up the pipe 93 flows into the diaphragm chamber 91 from the pilot hole 94a of the diaphragm valve body 94, but water flows out because the connected solenoid valve Bn is closed. Filled without. Accordingly, a large pressure is applied downward from the upper surface to the diaphragm valve body 94 having a large area receiving the water pressure, and the discharge of water to the outside is stopped because the diaphragm valve body 94 comes into contact with the valve seat 95.

On the other hand, when the solenoid valve Bn is opened as described above, since the input port 86 is in communication with the diaphragm chamber 91, the water in the diaphragm chamber 91 flows through the solenoid valve Bn via a pipe (not shown). Is discharged from. As a result, the pressure applied to the diaphragm valve element 94 decreases due to the flow of the water in the diaphragm chamber 91, so that the pipe 93
Is pushed up by the diaphragm valve body 94 against the urging force of the return spring 97 by the pressure, and is discharged from the water discharging portion 96 that has been opened to the paddy field. Also, assume that a negative pulse signal is applied to the solenoid valve Bn to close the valve. The water in the diaphragm chamber 91 no longer flows to any place again, and the water is filled in the diaphragm chamber 91. Therefore, the diaphragm valve element 94 comes into contact with the valve seat 95 again, and the water supply is stopped.

As described above, according to the solenoid valve control system described in the present embodiment, since the information signal including the address number for each solenoid valve is transmitted, any one of the plurality of solenoid valves can be selected. The operability was excellent because it could be operated. In addition, since the information signal and the power signal are transmitted to each solenoid valve, and each time the operation is confirmed and transmitted to the next solenoid valve, the command from the program controller 11 and the confirmation processing are facilitated. Was.
The reliability has been improved by the confirmation processing using the operation detection amplifier 48. In addition, by employing a configuration in which a plurality of solenoid valves are connected in parallel with two wires, a significant cost reduction can be achieved, and maintenance is greatly facilitated.
In particular, since the rectifiers 52 are provided in the receivers F1, F2,..., Fn, there is no need to worry about switching the polarities during maintenance such as disconnection even when a DC power supply is used. In addition, since the self-holding type solenoid valve is employed, pulse drive is sufficient for driving the solenoid valve, thereby saving energy. In particular, since the signals are sequentially transmitted so as to operate each solenoid valve, the capacity of one power supply is sufficient.
Therefore, it can be said that it is optimal in a paddy field as in the above embodiment using a solar and a battery as power sources.

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the control system for the solenoid valve used for opening and closing the water taps 3, 3,... In the paddy field has been described. However, the control system may be used for controlling a solenoid valve used in a factory or the like. .

[0039]

According to the present invention, a self-holding type solenoid valve is used, and a code including an address bit for specifying each solenoid valve among a large number of solenoid valves and a data bit for instructing opening and closing of the solenoid valve is provided. Command means for outputting an information signal,
Transmitting means for outputting a time-divided information signal and a power signal, which are obtained by converting a parallel signal output from a command means into a serial signal, and a power supply signal provided for each solenoid valve, and charging the power supplied from the transmitting means, Receiving means for operating a solenoid valve by taking out a serial signal and performing parallel conversion and comparing with setting data peculiar to each solenoid valve, and a configuration in which a plurality of receiving means are connected in parallel to one transmitting means by two wires As a result, an electromagnetic valve control system with excellent operability capable of independently controlling a plurality of electromagnetic valves can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a pipeline showing a water management demonstration field of a large section.

FIG. 2 is a conceptual diagram showing one embodiment of a solenoid valve control system according to the present invention.

FIG. 3 is a schematic diagram of a paddy field showing a cross section of a paddy field B and a cross section of a water level adjusting basin 6;

FIG. 4 is a waveform diagram transmitted by the solenoid valve control system.

FIG. 5 is a diagram showing the contents of an information signal.

FIG. 6 is a diagram showing bit contents of a data signal of an information signal.

FIG. 7 is a circuit diagram showing a transmitter of the solenoid valve control system.

FIG. 8 shows “0” signal and “1” converted into serial signals.
FIG. 4 is a waveform diagram showing signal distinction.

FIG. 9 is a waveform diagram showing an example of a serial transmission waveform.

FIG. 10 is a circuit diagram showing a receiver of a solenoid valve control system and a mechanism of a solenoid valve and a drain cock of a water tap connected to the receiver.

FIG. 11 is a circuit diagram showing a self-holding power amplifier.

FIG. 12 is a sectional view showing a self-holding type solenoid valve.

FIG. 13 is a cross-sectional view showing a water tap.

FIG. 14 is a waveform diagram showing a frequency multiplexed signal output from a transmission circuit in a conventional solenoid valve control system.

FIG. 15 is a waveform diagram of each part for explaining the operation of the conventional solenoid valve control system.

[Explanation of symbols]

 3 Water tap 4 Drain tap 11 Program controller 12 Transmitter 13,14 Electric wire F1, F2 ... Fn Receiver B1, B2 ... Bn Solenoid valve

Claims (5)

[Claims] An electromagnetic valve for maintaining an open state by mechanically self-holding, an address bit for specifying each electromagnetic valve among the plurality of electromagnetic valves, and a data bit for instructing opening and closing of the electromagnetic valve Command means for outputting an information signal composed of a code including: a transmitting means for outputting the information signal and a power signal obtained by converting the parallel signal output from the command means into a serial signal and a power signal in a time-division manner; Provided for each valve, the power supply is charged by a power supply signal sent from the transmission means, and the solenoid valve is operated by extracting the serial signal and comparing the parallel-converted information signal with setting data unique to each solenoid valve. A solenoid valve control system, comprising: a receiving unit to be connected; and the plurality of receiving units are connected in parallel to one transmitting unit by two wires. 2. The electromagnetic valve control system according to claim 1, wherein the transmitting unit converts the information signal into a serial signal by forming two types of pulse waves having different widths.
Converting means for converting the serial signal transmitted from the transmitting means into a parallel signal by a pulse width;
An electromagnetic valve control system comprising a conversion unit. 3. The solenoid valve control system according to claim 1, wherein said receiving means constitutes a circuit in which a rectifier is connected to an input terminal. . 4. The solenoid valve control system according to claim 1, wherein the transmission unit determines that the reception unit has driven the solenoid valve in accordance with the transmitted information signal. An electromagnetic valve control system, comprising: detection means for detecting a flow, and when the detection means detects a current flow, outputs a drive maintenance power supply as a continuous signal. 5. The solenoid valve control system according to claim 1, wherein a solar battery and a battery are used as the power supply.