JPWO2020090023A1 - Anti-frost device, anti-frost fan control device and anti-frost fan control method - Google Patents

Abstract

The frost-proof device (1-1) is provided at a height at which the inversion layer (X) of the field is generated, and is a drive source of the frost-proof fan (11) that blows the wind down to the field and the frost-proof fan (11). A generator (15), a temperature sensor (12) that detects the temperature on or near the leaf surface of the crop (A) in the field, and a generator (12) based on the detection values of the temperature sensor (12). It includes a control device (14) for transmitting an operation signal for operating the control device (14), and a battery (18) for supplying electric power to the control device (14). The control device (14) transmits an operation signal to the generator (15), and when it receives a power generation establishment signal from the generator (15), supplies the power of the generator (15) to the frost-proof fan (11).

Description

The present invention relates to a frost-proof device, a frost-proof fan control device, and a frost-proof fan control method.

Generally, an external power source such as electric power from a power transmission line is used as a drive source of the frost-proof fan. However, there are many places where it is difficult to secure an external power source, such as mountainous areas, where frost damage is likely to occur. Examples of the frost-proof device including the generator include the frost-proof device described in Japanese Patent Application Laid-Open No. 2008-61526 of Patent Document 1 and Japanese Patent Application Laid-Open No. 11-56126 of Patent Document 2. However, in these inventions, a generator is incidentally provided, wind power is generated when the frost-proof fan is not used, and the frost-proof device is secondarily used as a wind power generator.

Japanese Unexamined Patent Publication No. 2008-61526 Japanese Unexamined Patent Publication No. 11-56126

Since the generator provided in the frost-proof device described in Patent Document 1 and Patent Document 2 is not used as a drive source for the frost-proof fan, these inventions provide the frost-proof fan in a place where it is difficult to secure an external power source. It cannot be enabled.

The present invention has been made in view of the above circumstances, and provides a frost-proof device, a frost-proof fan control device, and a frost-proof fan control method that enable the frost-proof fan to be used even in a place where it is difficult to secure an external power source. The purpose is.

In order to achieve the above object, the frost-proof device according to the first aspect of the present invention is provided at a height at which a reverse layer of the field is generated, and a frost-proof fan that blows down the wind to the field and at least the agricultural products in the field. Based on the detection values of the first sensor that detects the temperature on or near the leaf surface, the generator that is the drive source of the anti-frost fan, and the detection value of the first sensor, an operation signal for operating the generator is transmitted. It includes a control device and a battery that supplies power to the control device. The control device transmits an operation signal to the generator, and when it receives a power generation establishment signal from the generator, it supplies the power of the generator to the frost-proof fan. To do.

When the detection value of the first sensor is lower than the first set temperature, the control device transmits an operation signal to the generator, determines the growth stage of the crop in the field based on the detection value of the first sensor, and determines the growth stage of the crop in the field. The first set temperature corresponding to the growth stage of the crop in the determined field may be determined.

The control device may determine the first set temperature based on the growth limit temperature corresponding to the growth stage of the crop in the field determined based on the detection value of the first sensor.

When the daily average value of the detection value of the first sensor exceeds the reference temperature, the control device calculates the difference between the reference temperature and the daily average value of the detection value of the first sensor, and calculates the difference. The growth stage of the crop in the field may be determined based on the cumulative value from the start date to today.

A second sensor for detecting the temperature at the height at which the inversion layer is generated is further provided, and the control device has a detection value of the first sensor lower than the first set temperature and a first sensor from the detection value of the second sensor. When the value obtained by subtracting the detected value of is larger than the second set temperature, the operation signal may be transmitted to the generator.

The field is equipped with a heater for raising the temperature, and the control device has a value obtained by subtracting the detection value of the first sensor from the detection value of the second sensor and the detection value of the first sensor being lower than the first set temperature. The operation of the heater may be started when the temperature is equal to or lower than the second set temperature.

In the frost-proof fan control device according to the second aspect of the present invention, the reversal layer of the field is formed based on at least the detection value of the first sensor that detects the temperature of the leaf surface of the farm crop or the vicinity of the leaf surface. It is a frost-proof fan control device that is installed at the height at which it is generated and transmits an operation signal to operate the generator to a generator that is a drive source of the frost-proof fan that blows down the wind into the field. When the power generation establishment signal is received from the generator, the power of the generator is supplied to the frost-proof fan.

The frost-proof fan control method according to the third aspect of the present invention is provided at a height at which a reversal layer of the field is generated, and a frost-proof fan that blows down the wind into the field, at least the leaf surface or leaves of agricultural products in the field. A first sensor that detects the temperature near the surface, a generator that is the power source of the frost-proof fan, a control device that sends an operation signal that causes the generator to operate the generator based on the detection value of the first sensor, and control. A frost-proof fan control method performed by a frost-proof fan equipped with a battery that supplies power to the device, including a step of transmitting an operation signal to a generator, a step of receiving a power generation establishment signal from the generator, and a generator. It is provided with a step of supplying the power of the frost-proof fan.

According to the present invention, the frost-proof fan can be used even in a place where it is difficult to secure an external power source.

It is a schematic diagram of the anti-frost device and the field which concerns on Embodiment 1 of this invention. It is a figure which shows the functional structure example of the control device which concerns on Embodiment 1. FIG. It is a schematic diagram explaining the power source control of the anti-frost fan by the control device which concerns on Embodiment 1. FIG. It is a figure which shows an example of the growth stage information which concerns on Embodiment 1. FIG. It is a figure which shows an example of the growth limit temperature information which concerns on Embodiment 1. FIG. It is a flowchart which shows the growth stage determination process which concerns on Embodiment 1. It is a flowchart which shows the generator control processing which concerns on Embodiment 1. It is a schematic diagram of the anti-frost device and the field which concerns on Embodiment 2 of this invention. It is a figure which shows the functional structure example of the control device which concerns on Embodiment 2. It is a flowchart which shows the generator control processing which concerns on Embodiment 2. It is a schematic diagram of the anti-frost device and the field which concerns on Embodiment 3 of this invention. It is a figure which shows the functional structure example of the control device which concerns on Embodiment 3. It is a flowchart which shows the generator heater control processing which concerns on Embodiment 3.

Hereinafter, the frost-proof device, the frost-proof fan control device, and the frost-proof fan control method according to the embodiment of the present invention will be described in detail with reference to the drawings. In the figure, the same or corresponding parts are designated by the same reference numerals.

(Embodiment 1)
FIG. 1 is a schematic view of an antifrost device 1-1 and a field according to the first embodiment of the present invention. The frost-proof device 1-1 is provided at the building pillar 100 in the field, the frost-proof fan 11 provided at the upper end of the building pillar 100, the temperature sensor 12 provided in the field, and the lower part of the building pillar 100. It is composed of a control device 14, a generator 15 provided in the field, and a solar panel 16 provided above the building pillar 100.

The frost-proof fan 11 is provided at the height at which the reversing layer X is generated at the upper end of the building column 100. The frost-proof fan 11 is rotated by the electric power from the generator 15 to blow down the warm air of the inversion layer X to the range including the crop A in the field. The frost-proof fan 11 includes a motor, a swing mechanism, a depression angle mechanism, and the like. The frost-proof fan 11 rotates when the electric power from the generator 15 is supplied, and stops rotating when the electric power supply from the generator 15 is stopped.

The temperature sensor 12 detects the temperature on or near the leaf surface of the crop A. The position where the temperature sensor 12 is installed may be changed depending on the position of the leaf surface of the crop A. The temperature sensor 12 calculates the daily average value of the measured values of the temperature on or near the leaf surface of the agricultural product A. Hereinafter, the daily average value of the measured values of the temperature sensor 12 is referred to as a low place average temperature. The temperature sensor 12 transmits the low place average temperature as a detection value to the control device 14. The temperature sensor 12 may transmit the measured value to the control device 14, and the control device 14 may perform a process of calculating the daily average value. The temperature sensor 12 is provided, for example, at a position not affected by the wind of the frost-proof fan 11 and / or the natural wind. The temperature sensor 12 is an example of the first sensor in the present invention.

It is known that crops have an index of growth limit temperature at which even a slight damage may occur when the plant body temperature is kept at the temperature for a certain period of time. The value of the growth limit temperature differs depending on the type of crop and the growth stage. The control device 14 uses this index to determine whether or not to operate the frost-proof fan 11.

The control device 14 determines the growth stage of the crop A from the low-altitude average temperature detected by the temperature sensor 12. The control device 14 specifies the growth limit temperature of the crop A from the type of the crop A and the growth stage of the crop A. The control device 14 determines a first set temperature for determining whether or not to operate the frost-proof fan 11 based on the growth limit temperature of the crop A. The first set temperature is set to a temperature higher than the growth limit temperature. When the low place average temperature <the first set temperature, the control device 14 starts the generator 15 and starts the operation of the frost-proof fan 11. When the low place average temperature ≥ the first set temperature + γ, the control device 14 stops the generator 15 and stops the operation of the frost-proof fan 11. γ is an arbitrary value of 0 or more.

An example of operation control of the frost-proof fan 11 is shown below. When the low place average temperature is lower than the first set temperature, the control device 14 transmits an operation signal instructing the generator 15 to operate. The operation signal is continuously transmitted to the generator 15. Upon receiving this signal, the generator 15 starts, and when the power can be stably supplied, the power generation establishment signal is transmitted to the control device 14. The power generation establishment signal is continuously transmitted to the control device 14 while the electric power can be stably supplied. Upon receiving the power generation establishment signal, the control device 14 turns on the electromagnetic switch of the generator 15 and supplies the power of the generator 15 to the frost-proof fan 11. The frost-proof fan 11 starts operation when electric power is supplied. When there are a plurality of anti-frost fans 11, in order to prevent an increase in the starting current, the control device 14 may be configured to instruct the operation of the anti-frost fans 11 to be started sequentially with a time lag.

An example of stop control of the frost-proof fan 11 is shown below. When the low place average temperature becomes equal to or higher than the first set temperature + γ, the control device 14 stops transmitting the operation signal to the generator 15. The generator 15 stops when it no longer receives the operation signal. The control device 14 turns off the electromagnetic switch of the generator 15 and stops the power supply to the frost-proof fan 11. The anti-frost fan 11 stops operating when the power supply is stopped.

The control device 14 obtains driving power from a battery (storage battery) 18 charged with electricity generated by the solar panel 16 using sunlight. The power source of the control device 14 is not limited to the electricity generated by the solar panel 16, and may include a single battery, or may obtain drive power from the battery for starting the cell motor included in the generator 15.

When the electricity generated by the solar panel 16 is used as the power source for the control device 14, the user does not need to charge the battery. Further, if the battery 18 is provided above the building pillar 100, theft can be prevented. When a single battery is used as the power source for the control device 14, the user charges the battery when the voltage drops. When the battery for starting the starter motor is used as the power source for the control device 14, it takes time to operate the generator 15 at the time of periodic inspection to charge the battery.

FIG. 1 shows a frost-proof device 1-1 including a building pillar 100, a frost-proof fan 11, a temperature sensor 12, a control device 14, a generator 15, and a solar panel 16 one by one. The number of components is not limited to one. For example, a plurality of anti-frost fans 11 may be provided for one building pillar 100, or a plurality of building columns 100 including the anti-frost fan 11 may be provided in the field. Further, one or a plurality of control devices 14 may control a plurality of anti-frost fans 11 and a generator 15.

The functional configuration of the control device 14 will be described with reference to FIGS. 2 and 3. As shown in FIG. 2, the configuration of the control device 14 includes a type acquisition unit 141, a storage unit 142, a detection signal reception unit 143, a growth stage determination unit 144, and a frost-proof fan control unit 145. These functions are realized by the control BOX 43 and the like shown in FIG.

The control BOX 43 is composed of, for example, a CPU (Central Processing Unit), a RAM (Random-Access Memory), a non-volatile memory, an interface for connecting to another device, and the like. The CPU loads the control program stored in the non-volatile memory into the RAM. The CPU executes each process of the type acquisition unit 141, the detection signal reception unit 143, the growth stage determination unit 144, and the frost-proof fan control unit 145 according to the loaded control program. The storage unit 142 is configured as a non-volatile memory.

The battery 18 stores electricity generated by the solar panel 16 and supplies electric power to the control device 14. The battery 18 may be provided inside the control device 14.

Returning to FIG. 2, the type acquisition unit 141 acquires type information indicating the type of the crop A cultivated in the field. The type acquisition unit 141 may be composed of an input device such as a touch panel or a button, or may be composed of a communication device for receiving type information. Further, when the type of the crop A to be cultivated in the field is determined and the frost-proof device 1-1 dedicated to the crop of that type is used, the control device 14 does not need to include the type acquisition unit 141.

The storage unit 142 stores the type information acquired by the type acquisition unit 141. The storage unit 142 stores in advance reference information indicating a standard for determining a growth stage and growth limit temperature information indicating a growth limit temperature for each growth stage for each type of crop. Details of the reference information and the growth limit temperature information will be described later.

The detection signal receiving unit 143 receives a signal indicating a detected value (low place average temperature) from the temperature sensor 12. The detection signal receiving unit 143 stores the low place average temperature information indicating the low place average temperature in the storage unit 142.

The growth stage determination unit 144 determines the current growth stage of the crop A based on the low place average temperature indicated by the low place average temperature information stored in the storage unit 142.

An example of a method for determining the growth stage will be described. The growth stage determination unit 144 determines whether or not the low place average temperature exceeds the reference temperature. When the low place average temperature exceeds the reference temperature, the growth stage determination unit 144 calculates the difference between the reference temperature and the low place average temperature, and calculates the cumulative value from the calculation start date to today. Hereinafter, the "cumulative value" refers to the cumulative value from the calculation start date of the difference between the reference temperature and the low place average temperature to today. The range of the cumulative value for each growth stage is determined for each type of crop, and the growth stage determination unit 144 determines that the growth stage has reached the range including the calculated cumulative value.

The reference information stored in the storage unit 142 includes reference temperature information indicating a reference temperature for each type of crop and growth stage information indicating a range of cumulative values for each growth stage for each type of crop.

Here, the growth stage information included in the reference information stored in the storage unit 142 will be described with reference to FIG. For example, tea has a growth stage of "pre-sprouting", "sprouting stage", "one-leaf stage", "two-leaf stage", "three-leaf stage", "four-leaf stage", "five-leaf stage", and "plucking stage". There is. The range of cumulative values that reach each growth stage is 0 ° C to 40 ° C, 41 ° C to 50 ° C, 51 ° C to 80 ° C, 80 ° C to 120 ° C, 121 ° C to 180 ° C, 181 ° C to 230 ° C, 231 ° C. ~ 280 ° C. and 281 ° C. to 310 ° C. The storage unit 142 stores the growth stage information indicating the range of the cumulative value for each growth stage as shown in FIG. 3 and the reference temperature information indicating the reference temperature as the reference information for each type of crop.

Returning to FIG. 2, the growth stage determination unit 144 first refers to the type information stored in the storage unit 142, and specifies the reference temperature information and the growth stage information of the type of the crop A. When the low place average temperature information is stored in the storage unit 142, the growth stage determination unit 144 calculates the cumulative value based on the low place average temperature information and the reference temperature information of the type of the crop A. The growth stage determination unit 144 refers to the growth stage information of the type of crop A, and determines which growth stage the crop A is currently in based on the cumulative value.

The growth stage determination unit 144 sends growth information indicating the current growth stage of the crop A to the frost-proof fan control unit 145. The growth stage determination unit 144 may compare the growth stage determined last time with the growth stage determined this time, and send growth information to the frost-proof fan control unit 145 only when the growth stage changes.

When the frost-proof fan control unit 145 receives the growth information from the growth stage determination unit 144, the frost-proof fan control unit 145 refers to the growth limit temperature information stored in the storage unit 142 and determines the first set temperature based on the growth limit temperature of the crop A. ..

Here, the growth limit temperature information stored in the storage unit 142 will be described with reference to FIG. FIG. 5 shows the growth limit temperature of tea cited from the publication as an example. Tea growth stages "Before sprouting", "Sprouting stage", "One leaf stage", "Two-leaf stage", "Three-leaf stage", "Four-leaf stage", "Five-leaf stage", and "Plucking stage" respectively As the growth limit temperature, -4.6 ° C, -3.0 ° C, -2.0 ° C, -2.0 ° C, -2.0 ° C, -1.8 ° C, -1.7 ° C, and -2.5 ° C is set. The storage unit 142 stores the growth limit temperature information indicating the growth limit temperature for each growth stage as shown in FIG. 5 for each type of crop.

Returning to FIG. 2, a specific method for determining the first set temperature will be described. First, the frost-proof fan control unit 145 refers to the type information stored in the storage unit 142, and specifies the growth limit temperature information of the type of the crop A. When the frost-proof fan control unit 145 receives the growth information from the growth stage determination unit 144, it refers to the growth limit temperature information of the type of crop A, and based on the growth limit temperature corresponding to the current growth stage of the crop A, The first set temperature is determined. The first set temperature is, for example, a growth limit temperature + 3.0 ° C. in consideration of early correspondence. For example, when the type of crop A is tea and the current growth stage is the sprouting stage, the growth limit temperature is −3.0 ° C. (see FIG. 5), so the first set temperature is 0.0. Let it be ° C.

When the low place average temperature information is stored in the storage unit 142, the frost-proof fan control unit 145 determines whether or not the low place average temperature is lower than the first set temperature. The frost-proof fan control unit 145 transmits an operation signal to the generator 15 when the low-place average temperature is lower than the first set temperature. The generator 15 that receives the operation signal starts, and when the power can be stably supplied, the power generation establishment signal is transmitted to the control device 14. Upon receiving the power generation establishment signal from the generator 15, the frost-proof fan control unit 145 turns on the electromagnetic switch, supplies the power of the generator 15 to the frost-proof fan 11, and starts the operation of the frost-proof fan 11. .. The frost-proof fan control unit 145 stops transmitting the operation signal when the low-altitude average temperature becomes equal to or higher than the first set temperature + γ. The frost-proof fan control unit 145 turns off the electromagnetic switch, stops the supply of the electric power of the generator 15 to the frost-proof fan 11, and stops the operation of the frost-proof fan 11. The frost-proof fan control unit 145 operates the frost-proof fan 11 even when the power generation establishment signal from the generator 15 is no longer received and / or when the power generation abnormality signal is received from the generator 15. You may stop.

An example of power supply control of the frost-proof fan 11A to the frost-proof fan 11C by the control device 14 will be described with reference to FIG. The control BOX 43 transmits an operation signal to the generator 15 when the low place average temperature, which is a detected value of the temperature sensor 12 (not shown), is lower than the first set temperature. The generator 15 that receives the operation signal starts, and when the power can be stably supplied, the power generation establishment signal is transmitted to the control device 14. When the control BOX 43 receives the power generation confirmation signal from the generator 15, the control BOX 43 turns on the electromagnetic switch 44. In the example of FIG. 3, the control BOX 43 uses the progressive timer 48A and the progressive timer 48B to turn on the electromagnetic switch 44A, the electromagnetic switch 44B, and the electromagnetic switch 44C in this order with a time lag. The electric power of the generator 15 is supplied in the order of the frost-proof fan 11A, the frost-proof fan 11B, and the frost-proof fan 11C with a time lag. The frost-proof fan 11A, the frost-proof fan 11B, and the frost-proof fan 11C start operation with a time lag. When the anti-frost fan 11A, the anti-frost fan 11B and the anti-frost fan 11C start operation at the same timing, the control device 14 includes the electromagnetic switch 44C, the electromagnetic switch 44B and the electromagnetic switch 44A, and the electromagnetic switch 44A. The progressive timer 48A and the progressive timer 48B may not be provided.

When the low place average temperature becomes the first set temperature + γ or more, the control BOX 43 stops the transmission of the operation signal and turns off the electromagnetic switch 44C, the electromagnetic switch 44B, the electromagnetic switch 44A and the electromagnetic switch 44. The generator 15 stops when it no longer receives the operation signal. The power supply of the generator 15 to the frost-proof fan 11C, the frost-proof fan 11B and the frost-proof fan 11A is stopped, and the frost-proof fan 11A, the frost-proof fan 11B and the frost-proof fan 11C stop operating. Further, the control BOX 43 not only when the low place average temperature becomes the first set temperature + γ or more, but also when the power generation establishment signal from the generator 15 is no longer received, and / or the power generation abnormality from the generator 15. When a signal is received, the electromagnetic switch 44C, the electromagnetic switch 44B, the electromagnetic switch 44A, and the electromagnetic switch 44 may be turned off.

The earth leakage breaker 45 cuts off the circuit when the earth leakage is detected. The molded case circuit breaker 46A, the molded case circuit breaker 46B, and the molded case circuit breaker 46C cut off the circuit when an overcurrent is detected. The transformer 47 transforms and supplies the electric power of the generator 15 to the control voltage (AC200V) of the frost-proof fan 11A, the frost-proof fan 11B, and the frost-proof fan 11C.

The control device 14 is not limited to one device, and may be realized by a plurality of devices. For example, a frost-proof fan control device having the function of the frost-proof fan control unit 145 shown in FIG. 2 may be provided. The frost-proof fan control device has, for example, the same configuration as the control device 14 shown in FIG.

Subsequently, examples of the growth stage determination process and the generator control process, which are the main processes executed by the control device 14, will be described with reference to FIGS. 6 and 7. First, the flow of the growth stage determination process executed by the control device 14 will be described with reference to FIG. The growth stage determination process shown in FIG. 6 is started when the power is turned on from the battery 18 to the control device 14. The growth stage determination unit 144 of the control device 14 determines whether or not the low place average temperature information is stored in the storage unit 142 (step S11).

When the low place average temperature information is not stored in the storage unit 142 (step S11; NO), the growth stage determination unit 144 repeats step S11 and waits for the low place average temperature information to be stored in the storage unit 142. .. When the low place average temperature information is stored in the storage unit 142 (step S11; YES), the growth stage determination unit 144 refers to the type information stored in the storage unit 142 and the reference temperature information included in the reference information, and is low. It is determined whether or not the average temperature exceeds the reference temperature (step S12). When the low place average temperature does not exceed the reference temperature (step S12; NO), the growth stage determination unit 144 repeats steps S11 and S12 and waits for the low place average temperature to exceed the reference temperature. When the low place average temperature exceeds the reference temperature (step S12; YES), the growth stage determination unit 144 calculates the difference between the reference temperature and the low place average temperature (step S13), and calculates the cumulative value (step S14). ).

The growth stage determination unit 144 determines the current growth stage of the crop A by referring to the growth stage information included in the reference information of the type of the crop A (step S15). The growth stage determination unit 144 sends growth information indicating the current growth stage of the crop A to the frost-proof fan control unit 145 (step S16). If the power of the control device 14 is not turned off (step S17; NO), the process returns to step S11, and steps S11 to S17 are repeated. When the power is turned off (step S17; YES), the process ends. In the configuration in which the growth stage determination unit 144 sends growth information to the frost-proof fan control unit 145 only when the growth stage changes, a step of comparing the previously determined growth stage with the growth stage determined this time after step S15. Is provided, and the process proceeds to step S16 only when the growth stage changes.

In step S16, the frost-proof fan control unit 145 that received the growth information refers to the type information and the growth limit temperature information stored in the storage unit 142, and is based on the growth limit temperature corresponding to the current growth stage of the crop A. , The first set temperature is determined.

Subsequently, the flow of the generator control process executed by the control device 14 will be described with reference to FIG. 7. The generator control process shown in FIG. 7 starts when the power is turned on from the battery 18 to the control device 14. In FIG. 7, the low place average temperature is L, and the first set temperature is α. The anti-frost fan control unit 145 of the control device 14 determines whether or not the low place average temperature L is lower than the first set temperature α (step S21).

When the low place average temperature L is equal to or higher than the first set temperature α (step S21; NO), the frost-proof fan control unit 145 repeats step S21, and the low place average temperature L becomes higher than the first set temperature α. Wait for it to go down. When the low place average temperature L is lower than the first set temperature α (step S21; YES), the frost-proof fan control unit 145 transmits an operation signal to the generator 15 (step S22). The generator 15 starts in response to the operation signal, and when the power can be stably supplied, the generator 15 transmits the power generation establishment signal to the control device 14. When the power generation establishment signal is not received from the generator 15 (step S23; NO), the frost-proof fan control unit 145 repeats step S23 and waits for the reception of the power generation establishment signal. When the power generation establishment signal is received from the generator 15 (step S23; YES), the frost-proof fan control unit 145 turns on the electromagnetic switch, supplies the power of the generator 15 to the frost-proof fan 11, and frost-proof. The operation of the fan 11 is started (step S24).

When the low place average temperature L is lower than the first set temperature α + γ (step S25; NO), the frost-proof fan control unit 145 repeats step S25 to bring the low place average temperature L to the first set temperature α + γ or higher. Wait for it to become. When the low place average temperature L becomes equal to or higher than the first set temperature α + γ (step S25; YES), the frost-proof fan control unit 145 stops transmitting the operation signal to the generator 15 (step S26). The generator 15 stops when it no longer receives the operation signal. The frost-proof fan control unit 145 turns off the electromagnetic switch, stops the supply of the electric power of the generator 15 to the frost-proof fan 11, and stops the operation of the frost-proof fan 11 (step S27). If the power of the control device 14 is not turned off (step S28; NO), the process returns to step S21, and steps S21 to S28 are repeated. When the power is turned off (step S28; YES), the process ends.

Step S25; When NO, whether or not the frost-proof fan control unit 145 has stopped receiving the power generation establishment signal from the generator 15, or has received a power generation abnormality signal indicating that power generation has been stopped from the generator 15. If it is determined whether or not the power generation establishment signal from the generator 15 is no longer received, or if the power generation abnormality signal is received from the generator 15, the process may proceed to step S26.

According to the anti-frost device 1-1 according to the first embodiment, the anti-frost fan can be used even in a place where it is difficult to secure an external power source. Further, by determining the first set temperature based on the growth limit temperature corresponding to the current growth stage of the crop A, a frost-proof device capable of responding to the change of the growth stage of the crop due to the change of the natural environment is provided. be able to.

(Embodiment 2)
In the second embodiment, the anti-frost device 1-2 has a temperature difference operation function. The differential temperature operation function is a function of operating the frost-proof fan 11 only when it is estimated that the inversion layer X is generated.

FIG. 8 is a schematic view showing the configuration of the anti-frost device 1-2 according to the second embodiment of the present invention. In the anti-frost device 1-2 of the second embodiment, a temperature sensor 13 provided on the upper part of the building pillar 100 is added to the anti-frost device 1-2 of the first embodiment.

The temperature sensor 13 detects the air temperature at the height at which the inversion layer X is generated. The temperature sensor 13 calculates the daily average value of the measured values of the air temperature at the height where the inversion layer X occurs. Hereinafter, the daily average value of the measured values of the temperature sensor 13 is referred to as a high-altitude average temperature. The temperature sensor 13 transmits the high-altitude average temperature as a detection value to the control device 14. The temperature sensor 13 may transmit the measured value to the control device 14, and the control device 14 may perform a process of calculating the daily average value. The temperature sensor 13 is provided, for example, at a position not affected by the wind of the frost-proof fan 11 and / or the natural wind. The temperature sensor 13 is an example of the second sensor in the present invention.

The control device 14 has a temperature difference operation function. Normally, the temperature decreases as the altitude rises, so the high-altitude average temperature <low-altitude average temperature. Therefore, when the high-altitude average temperature> the low-altitude average temperature, the high-altitude average temperature and the low-altitude average temperature have a difference opposite to the temperature difference due to the normal altitude difference, so that the altitude around the temperature sensor 13 It can be estimated that the inversion layer X is generated in. Therefore, in the control device 14, when the low place average temperature <the first set temperature and the high place average temperature-the low place average temperature> the second set temperature, the inversion layer X for which frost prevention is effective is effective. Is determined to occur, the generator 15 is started, and the operation of the frost-proof fan 11 is started. It is assumed that the second set temperature is predetermined. When the detected value of the high place average temperature − the low place average temperature ≦ the second set temperature −η, or when the low place average temperature ≧ the first set temperature + γ, the control device 14 has the inversion layer X. It is determined that the frost-proofing is not effective or the frost-proofing is not effective, and the generator 15 is stopped to stop the operation of the frost-proofing fan 11. However, even when the detected value of the high place average temperature − the low place average temperature ≦ the second set temperature, the control device 14 has the frost-proof fan 11 when the low place average temperature <the growth limit temperature. To run. Other configurations are the same as those in the first embodiment.

The functional configuration of the control device 14 of the second embodiment will be described with reference to FIG. The functional configuration of the control device 14 of the second embodiment is the same as that of the control device 14 of the first embodiment.

The detection signal receiving unit 143 receives a signal indicating a detected value (high place average temperature) from the temperature sensor 13 in addition to a signal indicating a detected value (low place average temperature) from the temperature sensor 12. The detection signal receiving unit 143 stores the low-altitude average temperature information indicating the low-altitude average temperature and the high-altitude average temperature information indicating the high-altitude average temperature in the storage unit 142 of the control device 14.

When the low place average temperature information and the high place average temperature information are stored in the storage unit 142, the frost-proof fan control unit 145 has the low place average temperature lower than the first set temperature and the high place average temperature to the low place. When the value obtained by subtracting the average temperature is larger than the second set temperature, an operation signal is transmitted to the generator 15. The generator 15 that receives the operation signal starts, and when the power can be stably supplied, the power generation establishment signal is transmitted to the control device 14. Upon receiving the power generation establishment signal from the generator 15, the frost-proof fan control unit 145 turns on the electromagnetic switch, supplies the power of the generator 15 to the frost-proof fan 11, and starts the operation of the frost-proof fan 11. ..

In the frost-proof fan control unit 145, when the low place average temperature becomes the first set temperature + γ or more, or the value obtained by subtracting the low place average temperature from the high place average temperature becomes the second set temperature −η or less. In this case, the transmission of the operation signal to the generator 15 is stopped. η is an arbitrary value of 0 or more. The generator 15 stops when it no longer receives the operation signal. The frost-proof fan control unit 145 turns off the electromagnetic switch, stops the supply of the electric power of the generator 15 to the frost-proof fan 11, and stops the operation of the frost-proof fan 11. Other functions are the same as those in the first embodiment.

Here, the generator control process executed by the control device 14 will be described with reference to FIG. The generator control process shown in FIG. 10 is started when the power from the battery 18 is turned on to the control device 14. In FIG. 10, the low place average temperature is L, the high place average temperature is H, the first set temperature is α, and the second set temperature is β. The anti-frost fan control unit 145 of the control device 14 determines whether or not the low place average temperature L is lower than the first set temperature α (step S31).

When the low place average temperature L is equal to or higher than the first set temperature α (step S31; NO), the frost-proof fan control unit 145 repeats step S31, and the low place average temperature L becomes higher than the first set temperature α. Wait for it to go low. When the low place average temperature L is lower than the first set temperature α (step S31; YES), the frost-proof fan control unit 145 sets the second setting by subtracting the low place average temperature L from the high place average temperature H. It is determined whether or not the temperature is higher than β (step S32).

When the value obtained by subtracting the low place average temperature L from the high place average temperature H is equal to or less than the second set temperature β (step S32; NO), the process proceeds to step S40. When the value obtained by subtracting the low place average temperature L from the high place average temperature H is larger than the second set temperature β (step S32; YES), the frost-proof fan control unit 145 transmits an operation signal to the generator 15 (step S32; YES). Step S33). The generator 15 starts in response to the operation signal, and when the power can be stably supplied, the generator 15 transmits the power generation establishment signal to the control device 14. When the power generation establishment signal is not received from the generator 15 (step S34; NO), the frost-proof fan control unit 145 repeats step S34 and waits for the reception of the power generation establishment signal. When the power generation establishment signal is received from the generator 15 (step S34; YES), the frost-proof fan control unit 145 turns on the electromagnetic switch, supplies the power of the generator 15 to the frost-proof fan 11, and frost-proof. The operation of the fan 11 is started (step S35).

When the value obtained by subtracting the low place average temperature L from the high place average temperature H is larger than the second set temperature β-η (step S36; NO), the frost-proof fan control unit 145 has the low place average temperature L of the second. 1 It is determined whether or not the set temperature is α + γ or higher (step S37). When the low place average temperature L is lower than the first set temperature α + γ (step S37; NO), the frost-proof fan control unit 145 repeats steps S36 and S37 to obtain the low place average temperature L from the high place average temperature H. It waits for the subtracted value to be the second set temperature β-η or less, or the low place average temperature L to be the first set temperature α + γ or more.

When the value obtained by subtracting the low place average temperature L from the high place average temperature H becomes the second set temperature β-η or less (step S36; YES), or the low place average temperature L is the first set temperature α + γ. When the above is achieved (step S37; YES), the frost-proof fan control unit 145 stops transmitting the operation signal to the generator 15 (step S38). The generator 15 stops when it no longer receives the operation signal. The frost-proof fan control unit 145 stops the supply from the generator 15 to the frost-proof fan 11 and stops the operation of the frost-proof fan 11 (step S39). If the power of the control device 14 is not turned off (step S40; NO), the process returns to step S31, and steps S31 to S40 are repeated. When the power is turned off (step S40; YES), the process ends.

Step S37; When NO, whether or not the frost-proof fan control unit 145 has stopped receiving the power generation establishment signal from the generator 15, or has received a power generation abnormality signal indicating that power generation has been stopped from the generator 15. If it is determined whether or not the power generation establishment signal from the generator 15 is no longer received, or if the power generation abnormality signal is received from the generator 15, the process may proceed to step S38.

According to the anti-frost device 1-2 according to the second embodiment, the anti-frost fan can be used even in a place where an external power source cannot be secured. Further, power saving can be achieved by operating the frost-proof fan only when it is estimated that the inversion layer X is generated.

(Embodiment 3)
In the second embodiment, the anti-frost device 1-3 is in the case where the detected value of the high place average temperature − the low place average temperature ≦ the second set temperature even when the low place average temperature <the first set temperature. That is, when the inversion layer X is not generated, the generator 15 is not started and the frost-proof fan 11 is not operated. However, even when the detected value of the high place average temperature − the low place average temperature ≦ the second set temperature, the control device 14 has the frost-proof fan 11 when the low place average temperature <the growth limit temperature. To run. On the other hand, in the third embodiment, when the low place average temperature <the first set temperature and the high place average temperature − the low place average temperature detection value ≦ the second set temperature, frost prevention. Anti-frost means other than the fan 11 may be operated.

FIG. 11 is a schematic view of the anti-frost device and the field according to the third embodiment of the present invention. In addition to the configuration of the frost-proof device 1-2, the frost-proof device 1-3 further includes a heater 17 for raising the temperature for heating the field. When the low place average temperature <the first set temperature and the high place average temperature − the low place average temperature detection value ≦ the second set temperature, the control device 14 starts the operation of the heater 17. .. The control device 14 operates the heater 17 when the low place average temperature ≥ the first set temperature + γ, or when the high place average temperature-the detected value of the low place average temperature> the second set temperature-η. To stop.

The functional configuration of the control device 14 of the third embodiment will be described with reference to FIG. The configuration of the control device 14 of the third embodiment is the same as that of the control device 14 of the second embodiment.

When the low place average temperature information and the high place average temperature information are stored in the storage unit 142, the frost-proof fan control unit 145 has the low place average temperature lower than the first set temperature and the high place average temperature to the low place. When the value obtained by subtracting the average temperature is equal to or lower than the second set temperature, the heater 17 is turned on. In the frost-proof fan control unit 145, when the low place average temperature becomes the first set temperature + γ or more, or the value obtained by subtracting the low place average temperature from the high place average temperature becomes larger than the second set temperature −η. If so, the power of the heater 17 is turned off. Other functions are the same as those in the second embodiment.

The power source of the heater 17 may be the generator 15, the battery 18, the battery for starting the starter motor included in the generator 15, or the battery provided by itself.

Here, the generator heater control process executed by the control device 14 will be described with reference to FIG. The generator heater control process shown in FIG. 13 starts when the power is turned on to the control device 14. In FIG. 13, the low place average temperature is L, the high place average temperature is H, the first set temperature is α, and the second set temperature is β. Since steps S51 to S59 are the same as steps S31 to S39 shown in FIG. 10, description thereof will be omitted.

When the value obtained by subtracting the low place average temperature L from the high place average temperature H in step S52 is equal to or less than the second set temperature β, the frost-proof fan control unit 145 starts the operation of the heater 17 (step S60). ). In the frost-proof fan control unit 145, the value obtained by subtracting the low-altitude average temperature L from the high-altitude average temperature H is equal to or less than the second set temperature β-η (step S61; NO), and the low-altitude average temperature L. However, when the temperature is lower than the first set temperature α + γ (step S62; NO), step S61 and step S62 are repeated, and the value obtained by subtracting the low place average temperature L from the high place average temperature H is obtained from the second set temperature β-η. It waits for the temperature to increase or the average low temperature L to reach the first set temperature α + γ or higher.

When the value obtained by subtracting the low place average temperature L from the high place average temperature H becomes larger than the second set temperature β-η (step S61; YES), or when the low place average temperature L becomes the first set temperature α + γ. When the above is achieved (step S62; YES), the frost-proof fan control unit 145 stops the operation of the heater 17 (step S63). If the power of the control device 14 is not turned off (step S64; NO), the process returns to step S51, and steps S51 to S64 are repeated. When the power is turned off (step S64; YES), the process ends.

According to the anti-frost device 1-3 according to the third embodiment, the anti-frost fan can be used even in a place where an external power source cannot be secured. Further, even when the inversion layer X is not generated, the frost damage of the crop A can be prevented.

In the above embodiment, the first set temperature is determined based on the growth limit temperature corresponding to the growth stage of the crop A in the field, but the present invention is not limited to this. The first set temperature may be determined according to the growth stage of the crop A in the field. For example, the first set temperature corresponding to "before sprouting", "sprouting stage", "one leaf stage", "two leaf stage", "three leaf stage", and "four leaf stage to plucking stage" of tea is 1 ° C. , 2 ° C, 3 ° C, 4 ° C, 5 ° C, 6 ° C, etc. may be predetermined. In this case, the storage unit 142 of the control device 14 stores the first set temperature information indicating the first set temperature predetermined for each growth stage for each type of crop instead of the growth limit temperature information.

In the above embodiment, the growth stage is determined using the cumulative value, but the present invention is not limited to this. Other methods may be used as long as the growth stage of the crop can be determined from the temperature on or near the leaf surface of the crop A.

In the first embodiment, whether the frost-proof fan control unit 145 of the control device 14 operates the frost-proof fan 11 based on the low-altitude average temperature which is the daily average value of the measured values of the temperature sensor 12. It was judged whether or not, but it is not limited to this. For example, the frost-proof fan control unit 145 may determine whether or not to operate the frost-proof fan 11 based on the one-hour average value of the measured values of the temperature sensor 12. Thereby, for example, when the temperature falls below the first set temperature only in the morning when the temperature drops, the frost-proof fan 11 can be efficiently operated. Similarly, in the second and third embodiments, the generator 15 may be controlled based on the one-hour average value of the low-altitude average temperature and the one-hour average value of the high-altitude average temperature.

In the first embodiment, when the low place average temperature is lower than the first set temperature, the control device 14 continuously transmits an operation signal to the generator 15, and the low place average temperature is equal to or higher than the first set temperature + γ. At that time, the transmission of the operation signal to the generator 15 is stopped, but the present invention is not limited to this. The control device 14 sporadically transmits an operation signal to the generator 15 when the low place average temperature is lower than the first set temperature, and stops at the generator 15 when the low place average temperature becomes the first set temperature + γ or more. The signal may be transmitted sporadically. In this case, the generator 15 starts when the operation signal is received, and stops the operation when the stop signal is received.

The present invention allows for various embodiments and modifications without departing from the broad spirit and scope of the invention. Moreover, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. The scope of the present invention is indicated by the scope of claims, not the embodiments. Then, various modifications made within the scope of the claims and the equivalent meaning of the invention are considered to be within the scope of the present invention.

1-1, 1-2, 1-3 Anti-frost device 11, 11A, 11B, 11C Anti-frost fan
12, 13 Temperature sensor
14 Control device
15 generator
16 Solar panel
17 heater
18 battery
43 Control BOX
44, 44A, 44B, 44C Electromagnetic switch
45 Earth Leakage Circuit Breaker 46A, 46B, 46C Molded Case Circuit Breaker
47 transformer
48A, 48B progressive timer
100 pillars
141 types acquisition department
142 Memory
143 Detection signal receiver
144 Growth stage judgment unit
145 Anti-frost fan control unit
A crop
X inversion layer

In order to achieve the above object, the anti-frost device according to the first aspect of the present invention is provided at a height at which a reversal layer of the field is generated, and an anti-frost fan that blows down the wind to the field and at least the agricultural products in the field The first sensor that detects the temperature on or near the leaf surface, the second sensor that detects the temperature at the height at which the reversal layer occurs , the generator that is the drive source of the frost-proof fan, and the first sensor based on the detected value and the detection value of the second sensor, and a control unit for transmitting a driving signal for driving a generator, and a battery for supplying power to the controller, the first sensor detecting When the value is lower than the first set temperature and the value obtained by subtracting the detection value of the first sensor from the detection value of the second sensor is larger than the second set temperature, an operation signal is transmitted to the generator. When the power generation establishment signal is received from the generator, the power of the generator is supplied to the frost-proof fan, and the detection value of the first sensor becomes equal to or higher than the value obtained by adding the first value to the first set temperature, or , When the value obtained by subtracting the detected value of the first sensor from the detected value of the second sensor becomes equal to or less than the value obtained by subtracting the second value from the second set temperature, the transmission of the operation signal to the generator is stopped. To do.

The control device may determine the growth stage of the crop in the field based on the detection value of the first sensor, and determine the first set temperature corresponding to the growth stage of the crop in the determined field.

The field is equipped with a heater for raising the temperature, and the control device has a value obtained by subtracting the detection value of the first sensor from the detection value of the second sensor and the detection value of the first sensor is lower than the first set temperature. When the temperature is equal to or lower than the second set temperature, the operation of the heater is started, and the detected value of the first sensor becomes equal to or higher than the value obtained by adding the first value to the first set temperature, or the second sensor. The operation of the heater may be stopped when the value obtained by subtracting the detection value of the first sensor from the detection value becomes larger than the value obtained by adding the second value to the second set temperature .

The anti-frost fan control device according to the second aspect of the present invention has at least the detection value of the first sensor that detects the temperature on the leaf surface of the agricultural product in the field or the vicinity of the leaf surface and the height at which the reversal layer of the field is generated. Based on the value detected by the second sensor that detects the temperature, the generator is installed at the height where the reverse layer of the field is generated, and is the drive source of the frost-proof fan that blows the wind down the field. A frost-proof fan control device that transmits an operation signal to be operated, in which the detection value of the first sensor is lower than the first set temperature and the detection value of the first sensor is subtracted from the detection value of the second sensor. However, when the temperature is higher than the second set temperature, the operation signal is transmitted to the generator, and when the power generation establishment signal is received from the generator, the power of the generator is supplied to the frost-proof fan, and the detection value of the first sensor is set. , When the value becomes equal to or greater than the value obtained by adding the first value to the first set temperature, or the value obtained by subtracting the detection value of the first sensor from the detection value of the second sensor is the second value from the second set temperature. When it becomes less than or equal to the value obtained by subtracting, the transmission of the operation signal to the generator is stopped .

The frost-proof fan control method according to the third aspect of the present invention is provided at a height at which a reversal layer of the field is generated, and a frost-proof fan that blows down the wind into the field, at least the leaf surface or leaves of agricultural products in the field. The first sensor that detects the temperature near the surface, the second sensor that detects the temperature at the height where the reverse layer is generated , the generator that is the power source of the frost-proof fan, the detection value of the first sensor and the detection value of the second sensor A frost-proof fan control method executed by a frost-proof device including a control device for transmitting an operation signal for causing the generator to operate the generator and a battery for supplying power to the control device based on the first method . When the detection value of the sensor is lower than the first set temperature and the value obtained by subtracting the detection value of the first sensor from the detection value of the second sensor is larger than the second set temperature, the operation signal is sent to the generator. The step of transmitting, the step of receiving the power generation establishment signal from the generator, the step of supplying the power of the generator to the frost-proof fan, and the detection value of the first sensor add the first value to the first set temperature. Power generation occurs when the value exceeds the specified value, or when the value obtained by subtracting the detected value of the first sensor from the detected value of the second sensor becomes equal to or less than the value obtained by subtracting the second value from the second set temperature. It includes a step of stopping the transmission of the operation signal to the machine .

FIG. 11 is a schematic view of the anti-frost device and the field according to the third embodiment of the present invention. In addition to the configuration of the frost-proof device 1-2, the frost-proof device 1-3 further includes a heater 17 for raising the temperature for heating the field. When the low place average temperature <the first set temperature and the high place average temperature − the low place average temperature detection value ≦ the second set temperature, the control device 14 starts the operation of the heater 17. .. The control device 14 operates the heater 17 when the low place average temperature ≥ the first set temperature + γ, or when the high place average temperature − the low place average temperature detection value> the second set temperature + η. To stop.

When the low place average temperature information and the high place average temperature information are stored in the storage unit 142, the frost-proof fan control unit 145 has the low place average temperature lower than the first set temperature and the high place average temperature to the low place. When the value obtained by subtracting the average temperature is equal to or lower than the second set temperature, the heater 17 is turned on. In the frost-proof fan control unit 145, when the low place average temperature becomes the first set temperature + γ or more, or the value obtained by subtracting the low place average temperature from the high place average temperature becomes larger than the second set temperature + η. If so, the power of the heater 17 is turned off. Other functions are the same as those in the second embodiment.

When the value obtained by subtracting the low place average temperature L from the high place average temperature H in step S52 is equal to or less than the second set temperature β, the frost-proof fan control unit 145 starts the operation of the heater 17 (step S60). ). In the frost-proof fan control unit 145, the value obtained by subtracting the low-altitude average temperature L from the high-altitude average temperature H is equal to or less than the second set temperature β + η (step S61; NO), and the low-altitude average temperature L. However, when the temperature is lower than the first set temperature α + γ (step S62; NO), step S61 and step S62 are repeated, and the value obtained by subtracting the low place average temperature L from the high place average temperature H is obtained from the second set temperature β + η. It waits for the temperature to increase or the average low temperature L to reach the first set temperature α + γ or higher.

When the value obtained by subtracting the low place average temperature L from the high place average temperature H becomes larger than the second set temperature β + η (step S61; YES), or when the low place average temperature L is the first set temperature α + γ When the above is achieved (step S62; YES), the frost-proof fan control unit 145 stops the operation of the heater 17 (step S63). If the power of the control device 14 is not turned off (step S64; NO), the process returns to step S51, and steps S51 to S64 are repeated. When the power is turned off (step S64; YES), the process ends.

In order to achieve the above object, the frost-proof device according to the first aspect of the present invention is provided at a height at which a reversal layer of the field is generated, and a frost-proof fan that blows down the wind into the field and at least the agricultural products in the field. The first sensor that detects the temperature on or near the leaf surface, the second sensor that detects the temperature at the height at which the reversal layer occurs, the generator that is the drive source of the frost-proof fan, and the first sensor Based on the average value of the detected values of the above for a predetermined period and the average value of the detected values of the second sensor for a predetermined period, a control device that transmits an operation signal for operating the generator and a battery that supplies power to the control device. In the control device, the average value of the detected values of the first sensor for a predetermined period is lower than the first set temperature, and the average value of the detected values of the second sensor for a predetermined period is used as the first sensor. When the value obtained by subtracting the average value of the detected values for a predetermined period is larger than the second set temperature, the operation signal is transmitted to the generator, and when the power generation establishment signal is received from the generator, the power of the generator is reduced. When the average value of the detection value of the first sensor for a predetermined period is equal to or greater than the value obtained by adding the first value to the first set temperature, or the detection value of the second sensor . When the value obtained by subtracting the average value of the detection value of the first sensor for a predetermined period from the average value of the predetermined period becomes equal to or less than the value obtained by subtracting the second value from the second set temperature, the generator is supplied. Stop transmitting the operation signal.

Claims (8)

A frost-proof fan that is installed at a height where an inversion layer is generated in the field and blows down the wind in the field.
At least, a first sensor that detects the temperature of the leaf surface of the crop in the field or the vicinity of the leaf surface,
The generator that is the drive source of the frost-proof fan and
A control device that transmits an operation signal for operating the generator based on the detection value of the first sensor, and
A battery that supplies power to the control device and
With
The control device is a frost-proof device that transmits the operation signal to the generator and receives the power generation establishment signal from the generator to supply the electric power of the generator to the frost-proof fan. The control device is
When the detection value of the first sensor is lower than the first set temperature, the operation signal is transmitted to the generator, and the growth stage of the crop in the field is determined based on the detection value of the first sensor. The anti-frost device according to claim 1, wherein the first set temperature corresponding to the determined growth stage of the crop in the field is determined. The control device is
The frost-proof device according to claim 2, wherein the first set temperature is determined based on the growth limit temperature corresponding to the growth stage of the crop in the field determined based on the detection value of the first sensor. The control device is
When the daily average value of the detected value of the first sensor exceeds the reference temperature, the difference between the reference temperature and the daily average value of the detected value of the first sensor is calculated, and the calculation of the difference is started. The anti-frost device according to claim 2 or 3, wherein the growth stage of the crop in the field is determined based on the cumulative value from the day to the present day. A second sensor for detecting the temperature at the height at which the inversion layer is generated is further provided.
The control device is
When the detection value of the first sensor is lower than the first set temperature, and the value obtained by subtracting the detection value of the first sensor from the detection value of the second sensor is larger than the second set temperature. The frost-proof device according to any one of claims 2 to 4, which transmits the operation signal to the generator. The field is equipped with a heater for raising the temperature.
The control device is
When the detection value of the first sensor is lower than the first set temperature, and the value obtained by subtracting the detection value of the first sensor from the detection value of the second sensor is equal to or less than the second set temperature. The anti-frost device according to claim 5, wherein the operation of the heater is started. At least, based on the detection value of the first sensor that detects the temperature of the leaf surface of the crop in the field or the vicinity of the leaf surface, the field is provided at a height at which an inversion layer of the field is generated, and the field is blown with wind. It is a frost-proof fan control device that transmits an operation signal for operating the generator to a generator that is a drive source of the frost-proof fan to be lowered.
A frost-proof fan control device that supplies the power of the generator to the frost-proof fan when the operation signal is transmitted to the generator and the power generation establishment signal is received from the generator. A frost-proof fan provided at a height at which an inversion layer of the field is generated and blowing down the wind to the field, at least a first sensor for detecting the temperature of the leaf surface of the crop in the field or the vicinity of the leaf surface, the prevention. A generator that is a power source for a frost fan, a control device that transmits an operation signal that causes the generator to operate the generator based on a value detected by the first sensor, and a battery that supplies power to the control device. A frost-proof fan control method performed by a frost-proof device equipped with
The step of transmitting the operation signal to the generator and
The step of receiving the power generation establishment signal from the generator and
The step of supplying the electric power of the generator to the frost-proof fan,
Anti-frost fan control method.

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