JP6555083B2 - Water temperature control system - Google Patents

Description

  The present invention relates to a water temperature control system for paddy fields.

  Rice grows differently depending on the water temperature. If rice can be cultivated at an appropriate water temperature, the yield can be expected to improve. Therefore, interest in technology for controlling the water temperature of paddy fields is increasing.

  For example, in order to control the water temperature, means for calculating the water temperature after water supply based on the water temperature of the water supply source and the water temperature of the paddy field and the volume of water in the paddy field and adjusting the appropriate water supply amount is known (patent) Reference 1).

JP 2000-69865 A

  However, the technique disclosed in Patent Literature 1 cannot determine the amount of water supply without measuring the water temperature of the water supply source, the water temperature of the paddy field, and the volume of water in the paddy field. It was difficult to calculate the correct volume of paddy fields because of the degree of seepage that varies depending on the soil type and the phenomenon of unevenness of paddy fields. Moreover, in large-scale paddy fields, there was a problem that water temperature difference occurred depending on the location, and the growth situation of rice appeared.

  This invention is made | formed in view of the situation which concerns, and it aims at controlling the water temperature in a paddy field accurately, without using the volume information of water.

  In order to solve the above problems, a water temperature control system for paddy fields according to the present invention is measured by a water temperature measuring device using a water temperature measuring device that measures the water temperature of the paddy field, a water inlet device that performs water entry into the paddy field, and feedback control. And a controller for operating the water inlet apparatus so as to determine the opening degree of the water inlet provided in the water inlet apparatus by comparing the set water temperature value with the set value of the target water temperature. To do.

  According to the present invention, based on the water temperature measured by the water temperature measuring device, by adjusting the amount of incoming water by adjusting the opening of the water inlet of the water inlet device, without measuring the volume of water in the paddy field, It becomes possible to adjust the water temperature inside automatically and accurately.

  Preferably, the water inlet device may include a water inlet direction adjusting unit that adjusts a direction of water to be introduced. In this case, since the direction of the incoming water can be adjusted, it becomes possible to eliminate the water temperature difference depending on the place in the paddy field more quickly.

  Preferably, the feedback control is P control. In this case, since the amount of incoming water is determined based on the value of the water temperature of the incoming water and the paddy field, the set value can be realized more quickly and the value can be stably maintained.

  Preferably, the feedback control is a three-position control. In this case, since fine adjustment of the amount of incoming water is not performed, the processing in the program can be performed simply.

  Preferably, a plurality of water temperature measuring devices are provided. In this case, since the water temperature at a plurality of points in the paddy field can be measured, the current water temperature of the paddy field can be accurately calculated.

Preferably, a plurality of water temperature measurement devices are provided, and the water temperature information transmitted by the water temperature measurement device includes position information indicating the installation positions of the plurality of water temperature measurement devices, and the water temperature value measured by the water temperature measurement device and the target It may be configured to adjust the incoming direction of the incoming direction adjusting means by comparison with the set value of the water temperature and the position information. In this case, the direction can be controlled so that the low temperature water does not travel to a place where the water temperature is low in the paddy field, and the water temperature can be accurately controlled.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to control the water temperature in a paddy field accurately, without using the volume information of water.

It is a block diagram of the sluice control system of the paddy field concerning Embodiment 1 of the present invention. It is an arrangement plan of a sluice gate control system for paddy fields according to Embodiment 1 of the present invention. It is an image figure of the water intake apparatus of the sluice gate control system of the paddy field which concerns on Embodiment 1 of this invention. It is a flowchart of operation | movement of the sluice gate control system of the paddy field which concerns on Embodiment 1 of this invention. It is an image figure of the water intake apparatus of the sluice gate control system of the paddy field which concerns on Embodiment 2 of this invention. It is a layout diagram of a sluice control system for paddy fields according to Embodiment 2 of the present invention. It is a layout plan of a sluice control system for paddy fields according to Embodiment 3 of the present invention.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined. In addition, various omissions, substitutions, or changes of components can be made without departing from the scope of the present invention. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

(Embodiment 1)
First, the configuration and processing operation of the water temperature control system 1 according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a water temperature control system according to Embodiment 1 of the present invention. As shown in FIG. 1, the water temperature control system 1 includes a water temperature measuring device 1a, a water intake device 1b, and a control device 1c.

The arrangement of each device is shown in FIG. The water temperature measuring device 1a is installed in the paddy field, the water inlet device 1b is installed at the water port of the paddy field, and the control device 1c is installed near the water port of the paddy field. The control device 1c and the water intake device 1b are connected by a cable or the like.

First, the water temperature measurement device 1a includes a calculation unit 11a that controls the entire water temperature measurement device, a water temperature measurement unit 12a that measures the water temperature, and a communication unit 13a that transmits the measured water temperature to a control device described later. Examples of hardware constituting the calculation unit 11a include a CPU (Central Processing Unit) and a DSP (Digital Signal Processor). The thermistor is used for the water temperature measurement unit 12a. The communication unit 13a uses a wireless communication device such as ZigBee (registered trademark) or a wireless LAN (Local Area Network). Moreover, the calculating part 11a and the communication part 13a may be comprised integrally.

The water intake apparatus 1b has the water inlet 11b and the water inlet shielding part which is one Example of a water inlet direction adjustment means. The water inlet device 1b opens the water inlet shielding portion determined by the control device 1c so that water can be taken from the water inlet 11b in accordance with the determined opening degree, takes water from the water inlet channel flowing through the paddy field, and supplies water to the paddy field. Has a role to supply. For example, as shown in FIG. 3, the water inlet 1 b of the water inlet 1 b is composed of two doors A and B, which are opened and closed up and down, and the amount of water input and the direction of incoming water. It is good to be able to adjust. For example, in FIG. 2, when the water temperature is low because the area (i) is likely to be shaded, only the door A is opened so that the water in the inlet water channel having a lower water temperature than the paddy field does not flow into the area (i). You can also. Further, the water inlet 11b may be opened and the water inlet direction adjusted by changing the opening of the door, such as opening the door A by 10 cm and opening the door B by 2 cm. That is, the place where the water temperature is expected to be lowered is input to the control device 1c in advance, and the calculation unit 13c determines the opening degree of the door A or the door B by taking this into account, thereby adjusting the amount of water and the direction of water intake. To do. Thereby, direction control can be performed so that low-temperature water does not travel to a place where the water temperature is low in the paddy field, and water temperature control can be performed with high accuracy.

In addition, although the case where the door A and the door B open and close was shown, it is good also as a structure which the door A slides to the door B side and the door B slides to the door A side. For example, when water in the water intake channel is supplied to the region (I) side shown in FIG. 2, the door B is slid to the door A side, and the opening degree on the right side of the water inlet 11b is adjusted. In addition, when water in the water intake channel is supplied to the area (A) side, the door A is slid to the door B side. When water is supplied to each of the area (A) and the area (I), the door A is slid to the door B side, the door B is slid to the door A side, and the water intake 11b Determine the opening on both sides. Thereby, since the amount of incoming water and the incoming direction can be adjusted, the direction can be controlled so that low-temperature water does not travel to a place where the water temperature is low in the paddy field, and the water temperature can be accurately controlled.

The control device 1c includes a communication unit 12c and a calculation unit 13c. The communication part 12c receives the measured value of the water temperature transmitted from the water temperature measuring device 1a. As hardware constituting the communication unit 12c, a wireless communication device such as ZigBee (registered trademark) or a wireless LAN (Local Area Network) may be used. The calculating part 13c determines the opening degree and direction of the door A or the door B using feedback control based on the water temperature of the paddy field received by the communication part 12c, and instructs the water inlet device 1b. Examples of hardware constituting the calculation unit 13c include a CPU (Central Processing Unit) and a DSP (Digital Signal Processor).

P control may be used as feedback control. In P control, the water inlet shielding part of the water inlet apparatus 1b is adjusted according to the difference with the setting value of the water temperature of a paddy field, and the opening degree of a water inlet and the direction of the water which flows into a paddy field are determined. For example, when the water inlet device 1b as shown in FIG. 3 is used, when the set value is 20 ° C. and the measured value of the water temperature is 25 ° C., the gate opens 10 cm, the set value is 20 ° C. and the measured value of the water temperature is 23 ° C. In this case, the opening is determined by opening the gate 5cm. Further, in consideration of the water temperature difference information by the region in the paddy field previously input to the control device 1c, the water inlet direction may be opened according to the opening degree of the door A or the door B, and the water inlet direction may be determined. In this case, since the incoming water amount and the incoming water direction are determined based on the water temperature and the water temperature, the set value can be realized more quickly and the value can be stably maintained.

Then, with reference to FIG. 4, the processing operation of the water temperature control system 1 which concerns on Embodiment 1 of this invention is demonstrated. FIG. 4 is a flowchart showing the processing operation of the water temperature control system 1 according to the first embodiment of the present invention.

First, the water temperature measuring unit 12a of the water temperature measuring device 1a measures the water temperature of the paddy field, and transmits the measured value of the water temperature from the communication unit 13a to the control device 1c. (Step S01)

Next, the control device 1c receives the measured value of the water temperature transmitted from the water temperature measuring device 1a by the communication unit 12c, adjusts the inlet shielding portion of the water inlet device 1b by P control which is one of feedback controls, Determine the direction of water and the direction of water entering the paddy field. (Step S02)

As the P control, the opening degree is specifically determined by the following procedure. The current water temperature in the paddy field is NT, the ideal water temperature in the paddy field is OT, and the difference between NT and OT is taken. Thereby, the difference diff between the current water temperature and the ideal water temperature is obtained.
NT-OT = diff (1)
Next, the following formula (2)
OW = Kp × diff (2) Kp uses a constant to determine the aperture OW. Kp is determined in advance using a technique such as a step response method or a limit sensitivity method.

Next, the control device 1c opens the water inlet shielding portion of the water inlet device 1b by the opening determined in step S02, and draws water into the paddy field. (Step S03) For example, the procedure of Step S01 to Step S03 is repeated at a predetermined interval, such as once every 10 minutes, so that the water temperature of the paddy field becomes a set value.

As described above, the water temperature control system according to the present embodiment includes the water temperature measuring device 1a, the water inlet device 1b, and the control device 1c, the water inlet control by adjusting the opening degree and direction of the water inlet of the controller 1c, and the water temperature. Repeat the measurement. Therefore, it becomes possible to eliminate the water temperature difference depending on the place in the paddy field.

(Embodiment 2)
Next, with reference to FIG. 5 and FIG. 6, the structure of the water temperature control system which concerns on Embodiment 2 of this invention is demonstrated. FIG. 5: is the figure of the water intake apparatus of the water temperature control system which concerns on Embodiment 2 of this invention, The top view and the side view seen from the paddy field side are shown. FIG. 6 shows an installation example.

The water inlet shielding portion of the water inlet device 2b is constituted by two pieces of a door C and a door D which are one embodiment of the water inlet direction adjusting means, and these can be opened and closed leftward and rightward to adjust the water inlet direction. This is different from the first embodiment. The opening degree is adjusted according to the water temperature difference from the set value, and the water inlet direction is adjusted based on the water temperature, as in the first embodiment. The door C and the door D have the drive member 21b fixed to each door. The drive member 21b moves based on a command from the control device 1c. When the driving member 21b moves, the door C or the door D fixed to the driving member 21b is also interlocked. For example, in FIG. 6, when the water temperature in the region (I) and the region (U) is low because it tends to be shaded, the water in the water channel having a lower water temperature than the paddy field is in the region (I) and the region (U). The door D is opened after adjusting the angle so that it does not flow. Thereby, direction control can be performed so that low-temperature water does not travel to a place where the water temperature is low in the paddy field, and water temperature control can be performed with high accuracy.

The water inlet direction adjusting means is not limited to the examples given in the first and second embodiments, and any means may be used as long as it can adjust the water incoming direction.

(Embodiment 3)
Next, the configuration of the water temperature control system according to the third embodiment of the present invention will be described.

The water temperature control system is different from the first embodiment in that three-position control is used for feedback control. Three-position control is one of the feedback control methods used when the target control amount value is not limited to a single point but within a certain range. In some cases, the control amount can be controlled with better accuracy than P control. Control becomes possible. In this system, the value of the water temperature of the paddy field when opening the gate is different from the value of the water temperature of the paddy field when closing the gate. For example, when the water temperature within the set value ± 3 ° C. is the target range of the water temperature to be controlled, the gate is opened when the set value is + 3 ° C. or more, and is closed when the set value is −3 ° C. or less. In this case, since fine adjustment of the amount of incoming water is not performed, the processing in the program can be performed simply.

(Embodiment 4)
Next, with reference to FIG. 7, the structure of the water temperature control system 10 which concerns on Embodiment 4 of this invention is demonstrated. FIG. 7 is a layout diagram of the water temperature control system 10 according to the fourth embodiment of the present invention.

The water temperature control system 10 is different from the first embodiment in that there are a plurality of water temperature measuring devices 1a. In this embodiment, the two water temperature measuring devices 1a transmit the measured value of the water temperature at each point to the control device 1c. The two water temperature measuring devices 1a are installed in two places, a place having the lowest water temperature in the paddy field and a place having the highest water temperature in the paddy field. For example, the place where the water temperature is the lowest in the paddy field is the vicinity of the paddy field mouth as shown in FIG. The place where the water temperature is the highest in the paddy field is a place that is out of the flow of water from the water outlet of the paddy field to the water bottom, which is a drain outlet for draining unnecessary water, as shown in FIG. The control device 1c receives the measured value of the water temperature from the communication unit 13a of the water temperature measuring device 1a, and determines the opening of the water inlet based on the result. When determining the opening of the water inlet, the calculation unit 11a of the control device 1c uses a value obtained by averaging the water temperature measurement values at each point. In this case, since the average of the maximum value and the minimum value of the water temperature in the paddy field is used, the water temperature of the paddy field can be accurately calculated.

(Embodiment 5)
The fifth embodiment is different from the first to fourth embodiments in that each water temperature measuring device 1a in the paddy field has an installation position ID. The water temperature information transmitted from the water temperature measuring device 1a to the control device 1c is transmitted including an installation position ID which is position information indicating the installation position of the water temperature measuring device 1a in addition to the measured value of the water temperature. When the communication unit 12c of the control device 1c receives the installation position ID and the measured value of the water temperature, the calculation unit 13c of the control unit 1c determines the opening of the water inlet and the water inlet direction, and transmits them to the water inlet device 1b. For example, when the measured value of the water temperature of the position information A is lower than the measured value of the water temperature of the position information B, the cold water from the incoming water channel is introduced toward the water temperature measuring device 1b of the position information B. The opening of the water inlet and the water inlet direction are adjusted by the water inlet direction adjusting means. Thus, since the control apparatus 1c can grasp | ascertain where the water temperature in a paddy field is low, water temperature control can be carried out, such as being able to carry out direction control so that a low temperature water does not advance to the low water temperature place in a paddy field. It becomes possible to carry out with high accuracy.

  While the present invention has been described with reference to the embodiments and modifications, the present invention is not limited to these embodiments and the like, and various modifications can be made.

  For example, a temperature controller such as a heater or a water temperature controller is provided in the vicinity of the water inlet devices 1b and 2b, and the water inlet temperature is adjusted in advance based on the measured value of the water temperature transmitted from the water temperature measuring device 1a. It doesn't matter.

  DESCRIPTION OF SYMBOLS 1 ... Water temperature control system, 1a ... Water temperature measuring device, 11a ... Calculation part, 12a ... Water temperature measuring part, 13a ... Communication part, 1b, 2b ... Water inlet apparatus, 11b ... Water inlet, 1c ... Control apparatus, 12c ... Communication part, 13c: arithmetic unit, 21b: drive member

Claims (3)

A water temperature control system for adjusting the water temperature of a paddy field,
A plurality of water temperature measuring devices for measuring the water temperature of the paddy field;
A water entry device for performing water entry into the paddy field;
Using feedback control, the water temperature value measured by the water temperature measuring device is compared with the set value of the target water temperature to determine the opening of the water inlet provided in the water inlet, and the determined opening is obtained. A control device for operating the water intake device,
Equipped with a,
The water inlet device includes a water inlet direction adjusting means for adjusting the direction of water to be supplied,
The water temperature information transmitted by the water temperature measuring device includes position information indicating installation positions of the plurality of water temperature measuring devices,
A water temperature control system that adjusts the incoming water direction of the incoming water direction adjusting means based on a comparison between a water temperature value measured by the water temperature measuring device and a set value of a target water temperature and the position information . The water temperature control system according to claim 1 , wherein the feedback control is P control. The water temperature control system according to claim 1 , wherein the feedback control is a three-position control.

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