NZ775312A - Frost prevention apparatus, frost prevention fan control device, and frost prevention fan control method - Google Patents
Frost prevention apparatus, frost prevention fan control device, and frost prevention fan control methodInfo
- Publication number
- NZ775312A NZ775312A NZ775312A NZ77531218A NZ775312A NZ 775312 A NZ775312 A NZ 775312A NZ 775312 A NZ775312 A NZ 775312A NZ 77531218 A NZ77531218 A NZ 77531218A NZ 775312 A NZ775312 A NZ 775312A
- Authority
- NZ
- New Zealand
- Prior art keywords
- sensor
- temperature
- frost prevention
- predetermined period
- generator
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G13/00—Protecting plants
- A01G13/08—Mechanical apparatus for circulating the air
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Landscapes
- Environmental Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Greenhouses (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Defrosting Systems (AREA)
- Catching Or Destruction (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
Abstract
A frost protection apparatus (1-1) is provided with: a frost protection fan (11) which is disposed at a height at which an inversion layer (X) is generated in an agricultural field and sends air down to the agricultural field; a power generator (15) which is a drive source for the frost protection fan (11); a temperature sensor (12) for detecting the temperature of or near the surface of a leaf of a crop (A) in the field; a control device (14) for transmitting an operation signal for operating the power generator (15) on the basis of a detection value from the temperature sensor (12); and a battery (18) for supplying power to the control device (14). When the control device (14) transmits the operation signal to the power generator (15) and receives a power generation establishment signal from the power generator (15), the control device (14) supplies power from the power generator (15) to the frost protection fan (11).
Description
DESCRIPTION
Title of ion
FROST PREVENTION APPARATUS, FROST PREVENTION FAN CONTROL
DEVICE, AND FROST PREVENTION FAN CONTROL METHOD
Technical Field
The present disclosure relates to a frost prevention apparatus, a frost
prevention fan control device, and a frost prevention fan l method.
ound Art
Typically, an external power supply such as power from a power
transmission line is used as the drive source of a frost prevention fan. However, in
many cases, it is difficult to procure an external power supply in farming locations where
frost is likely to occur, such as mountainous areas. Examples of frost prevention
apparatuses that are provided with a generator include the frost prevention apparatuses
described in Unexamined Japanese Patent Application Publication No. 1526
(Patent Literature 1) and Unexamined Japanese Patent ation Publication No. H11-
56126 (Patent Literature 2). However, these inventions e a generator as an
incidental constituent that performs wind power generation when the frost prevention fan
is not in use, and the frost prevention apparatus is arily used as a wind power
generator.
[0003] In this specification where reference has been made to patent specifications,
other external documents, or other sources of information, this is generally for the
purpose of providing a context for discussing the features of the ion. Unless
specifically stated otherwise, reference to such external documents is not to be construed
as an admission that such documents, or such s of information, in any jurisdiction,
are prior art, or form part of the common general knowledge in the art.
Citation List
Patent Literature
Patent Literature 1: Unexamined Japanese Patent Application Publication No.
2008-61526
Patent Literature 2: Unexamined Japanese Patent Application ation No. H11-
56126
Summary of Invention
Technical Problem
The generators of the frost prevention apparatuses described in Patent
Literature 1 and Patent Literature 2 are not used as the drive source of the frost tion
fan and, as such, these inventions cannot enable the use of frost prevention fans in locations
where it is difficult to procure an external power supply.
The present disclosure is made with the view of the above situation, and an
objective of the present disclosure is to provide a frost prevention apparatus, a frost
tion fan control device, and a frost prevention fan l method that enable use of
a frost prevention fan, even in locations where it is difficult to e an external power
supply. An additional or alternative object of the ion is to at least provide the public
with a useful choice.
Solution to Problem
In accordance with a first aspect of the invention, there is provided a frost
tion apparatus, comprising: a frost prevention fan that is provided at a height at
which an inversion layer of a field occurs, and that blows wind down on the field; a first
sensor that detects at least a temperature of a leaf surface, or a temperature near the leaf
surface, of crops of the field; a second sensor that s an air temperature at a height at
which the inversion layer occurs; a generator that is a drive source of the frost prevention
fan; a control device that sends, based on an average value of a predetermined period of
detection values of the first sensor and an e value of a predetermined period of
detection values of the second sensor, an operation signal causing the generator to
operate; and a battery that supplies power to the control device; wherein the control
device sends the operation signal to the generator when the average value of the
predetermined period of the ion values of the first sensor is lower than a first setting
temperature and a value obtained by subtracting the average value of the predetermined
period of the detection values of the first sensor from the average value of the
predetermined period of the detection values of the second sensor is greater than a second
setting temperature, supplies power of the generator to the frost prevention fan when a
generation establishment signal is ed from the generator, and stops sending of the
operation signal to the generator when the average value of the predetermined period of
the detection values of the first sensor is greater than or equal to a value obtained by
adding a first value to the first setting temperature or when the value obtained by
subtracting the e value of the predetermined period of the detection values of the
first sensor from the average value of the predetermined period of the detection values of
the second sensor is less than or equal to a value obtained by subtracting a second value
from the second setting temperature.
[0008] The control device may determine a growth stage of the crops of the field
based on the average value of the predetermined period of the detection values of the first
, and determine the first setting temperature that corresponds to the determined
growth stage of the crops of the field.
The l device may determine the first g temperature based on a
growth limit ature that corresponds to the growth stage of the crops of the field
determined based on the average value of the predetermined period of the detection values
of the first sensor.
The control device may, in a case in which an average value of one day of the
detection values of the first sensor s a reference temperature, calculate a difference
between the reference temperature and the average value of one day of the detection values
of the first sensor, and determine the growth stage of the crops of the field based on a
cumulative value from a calculation start day of the difference to a present day.
The frost prevention apparatus according to a first aspect of the t
disclosure may include, in the field, a heater for raising temperature, wherein the control
device starts operation of the heater when the average value of the predetermined period of
the detection values of the first sensor is lower than the first setting temperature and the
value obtained by subtracting the average value of the ermined period of the
detection values of the first sensor from the average value of the predetermined period of
the detection values of the second sensor is less than or equal to the second g
temperature, and stops the ion of the heater when the average value of the
predetermined period of the detection values of the first sensor is greater than or equal to
the value obtained by adding the first value to the first setting temperature or when the
value obtained by subtracting the average value of the predetermined period of the
detection values of the first sensor from the average value of the predetermined period of
the detection values of the second sensor is greater than a value obtained by adding the
second value to the second setting temperature.
[0012] In accordance with a second aspect of the invention, there is provided a frost
prevention fan control device that sends, based on an e value of a predetermined
period of detection values of a first sensor that s at least a temperature of a leaf
surface, or a temperature near the leaf surface, of crops of a field and an e value of
a predetermined period of detection values of a second sensor that detects an air
temperature at a height at which the inversion layer of the field occurs, to a generator that
is a drive source of a frost prevention fan that is provided at a height at which an
inversion layer of the field occurs and that blows wind down on the field, an operation
signal causing the generator to operate, the frost prevention fan control device sending the
operation signal to the generator when the e value of the predetermined period of
the ion values of the first sensor is lower than a first setting temperature and a value
obtained by subtracting the average value of the predetermined period of the detection
values of the first sensor from the average value of the predetermined period of the
detection values of the second sensor is greater than a second setting temperature,
supplying power of the generator to the frost prevention fan when a generation
establishment signal is received from the tor, and ng sending of the operation
signal to the generator when the average value of the predetermined period of the
detection values of the first sensor is greater than or equal to a value obtained by adding a
first value to the first setting temperature or when the value obtained by subtracting the
average value of the predetermined period of the ion values of the first sensor from
the average value of the predetermined period of the detection values of the second
sensor is less than or equal to a value obtained by subtracting a second value from the
second setting ature.
In accordance with a third aspect of the invention, there is provided a frost
prevention fan control method to be executed by a frost prevention fan control device
that, based on an average value of a predetermined period of detection values of a first
sensor that detects at least a temperature of a leaf surface, or a temperature near the leaf
surface, of crops of a field and an average value of a predetermined period of detection
values of a second sensor that detects an air temperature at a height at which an inversion
layer of the field occurs, sends an operation signal causing a generator to operate to the
tor, the generator being a drive source of a frost tion fan that is provided at
the height at which the inversion layer of the field occurs and that blows wind down on
the field, the method including: sending the operation signal to the tor when the
e value of the ermined period of the detection values of the first sensor is
lower than a first setting temperature and a value obtained by subtracting the average
value of the predetermined period of the detection values of the first sensor from the
average value of the predetermined period of the detection values of the second sensor is
greater than a second setting temperature; receiving a generation establishment signal
from the generator; supplying power of the generator to the frost prevention fan; and
stopping sending of the operation signal to the generator when the average value of the
predetermined period of the detection values of the first sensor is greater than or equal to
a value obtained by adding a first value to the first setting temperature or when the value
obtained by subtracting the average value of the predetermined period of the detection
values of the first sensor from the average value of the predetermined period of the
detection values of the second sensor is less than or equal to a value ed by
subtracting a second value from the second setting ature.
nce may be made in the description to subject matter which is not in
the scope of the appended claims. That subject matter should be readily identifiable by a
person skilled in the art and may assist putting into practice the invention as defined in the
appended .
The term "comprising" as used in this specification and claims means
"consisting at least in part of". When interpreting statements in this specification and
claims which include the term "comprising", other features besides the features prefaced
by this term in each statement can also be present. Related terms such as "comprise" and
ised" are to be interpreted in a similar manner.
ageous Effects of Invention
ing to the present disclosure, use of the frost prevention fan is enabled,
even in locations where it is difficult to procure an external power supply.
Brief Description of Drawings
[0017] is a schematic drawing of a field and a frost prevention apparatus
according to Embodiment 1 of the present disclosure;
is a drawing illustrating an example of the functional configuration of a
control device according to Embodiment 1;
is a schematic g explaining power supply control of a frost prevention
fan, carried out by the control device ing to Embodiment 1;
is a drawing illustrating an example of growth stage information according
to Embodiment 1;
is a drawing illustrating an example of growth limit temperature information
according to Embodiment 1;
is a flowchart illustrating growth stage determination processing according
to Embodiment 1;
is a flowchart rating generator control processing according to
Embodiment 1;
is a tic drawing of a field and a frost prevention apparatus according
to Embodiment 2 of the present disclosure;
is a drawing illustrating an example of the functional uration of a
control device according to Embodiment 2;
is a flowchart illustrating generator control processing according to
Embodiment 2;
is a schematic drawing of a field and a frost prevention apparatus according
to Embodiment 3 of the present sure;
is a drawing illustrating an example of the functional configuration of a
control device according to Embodiment 3; and
is a flowchart illustrating generator and heater control processing according
to Embodiment 3.
ption of Embodiments
[0018] Hereinafter, a frost prevention apparatus, a frost prevention fan control
device, and a frost prevention fan control method according to embodiments of the
present disclosure are described in detail while referencing the drawings. Note that, in
the drawings, identical or corresponding components are denoted with the same reference
[0019] ment 1
is a schematic drawing of a field and a frost prevention tus 1-1
according to Embodiment 1 of the t sure. The frost prevention apparatus 1-
1 includes a pillar 100 of the field, a frost prevention fan 11 provided on a top end of the
pillar 100, a temperature sensor 12 provided in the field, a l device 14 provided at a
lower portion of the pillar 100, a tor 15 provided in the field, and a solar panel 16
provided on an upper portion of the pillar 100.
[0020] The frost prevention fan 11 is provided at a height, of the upper end of the
pillar 100, at which an inversion layer X occurs. The frost tion fan 11 rotates
using power from the generator 15 to blow the warm air of the inversion layer X down on
the area including crops A of the field. The frost prevention fan 11 includes a motor, a
swing mechanism, a sion angle mechanism, and the like. The frost prevention
fan 11 rotates when power is supplied from the generator 15, and the on stops when
the supply of power from the generator 15 stops.
The temperature sensor 12 detects a ature of a leaf surface, or a
temperature near the leaf surface, of the crops A. The position at which the temperature
sensor 12 is set may be changed depending on the position of the leaf surface of the crops
A. The temperature sensor 12 calculates an average value of one day of measured
values of the temperature of the leaf surface, or the temperature near the leaf surface, of
the crops A. Hereinafter, the average value of one day of the measured values
calculated by the temperature sensor 12 is referred to as a “low position average
temperature.” The temperature sensor 12 sends the low position average temperature to
the control device 14 as a detection value. Note that processing may be carried out in
which the temperature sensor 12 sends the measured values to the l device 14, and
the control device 14 calculates the average value of one day. In one example, the
temperature sensor 12 is provided at a position that is not affected by the wind from the
frost prevention fan 11 and/or naturally occurring winds. The temperature sensor 12 is
an e of the first sensor of the present disclosure.
It is known that crops have indicators called growth limit temperatures. If
the plant is placed for a certain amount of time at the growth limit temperature, there is at
least a slight possibility of damage to the crops. The values of the growth limit
atures differ depending on the type and the growth stage of the crops. The
control device 14 uses these indicators to determine whether to operate the frost
prevention fan 11.
[0023] The control device 14 determines the growth stage of the crops A from the
low position average temperature that is the detection value of the temperature sensor 12.
The control device 14 fies the growth limit temperature of the crops A from the type
of the crops A and the growth stage of the crops A. The control device 14 determines,
on the basis of the growth limit temperature of the crops A, a first setting temperature for
determining whether to operate the frost prevention fan 11. The first setting ature
is set to a temperature higher than the growth limit temperature. When the low on
average temperature < the first setting temperature, the control device 14 starts up the
generator 15 to start the ion of the frost prevention fan 11. When the low position
average temperature ≥ the first setting temperature + γ, the l device 14 stops the
generator 15, thereby stopping the operation of the frost prevention fan 11. γ is any
value greater or equal to 0.
Hereinafter, an example of drive control of the frost prevention fan 11 is
described. When the low position average ature is lower than the first setting
temperature, the control device 14 sends an operation signal commanding the generator
15 to operate. The operation signal is sent continuously to the generator 15. The
generator 15 that receives the signal starts up and, when the generator 15 is in a state in
which power can be stably supplied, the generator 15 sends a generation establishment
signal to the l device 14. The generation establishment signal is continuously sent
to the control device 14 while the generator 15 is in the state in which power can be
stably supplied. When the control device 14 receives the generation establishment
signal, the l device 14 turns an electromagnetic switch of the generator 15 ON, and
supplies the power of the generator 15 to the frost prevention fan 11. When the frost
prevention fan 11 is supplied with power, the frost prevention fan 11 starts operating. In
a case in which a ity of frost prevention fans 11 is provided, a configuration is
possible in which, in order to prevent an increase in starting current, the control device 14
performs control so as to sequentially start the operation of the frost prevention fans 11
with a time lag.
Hereinafter, an example of stopping l of the frost prevention fan 11 is
described. When the low position average temperature is greater than or equal to the
first setting temperature + γ, the control device 14 stops the sending of the operation
signal to the generator 15. The generator 15 stops when the operation signal is no
longer received. The control device 14 turns the electromagnetic switch of the tor
OFF, and stops the supply of power to the frost prevention fan 11. The frost
prevention fan 11 stops operating when the supply of power stops.
The control device 14 obtains drive power from a battery 18 (power storage
battery) that is d by electricity generated by a solar panel 16 using sunlight. The
power supply of the l device 14 is not limited to the electricity generated by the
solar panel 16. For example, the control device 14 may include a stand-alone battery, or
may obtain drive power from a startup battery for a starter motor of the generator 15.
When the electricity generated by the solar panel 16 is used as the power supply of
the control device 14, there is no need for a user to charge the battery. Additionally, if
the battery 18 is provided on the upper portion of the pillar 100, theft can be prevented.
When the stand-alone battery is used as the power supply of the control device 14, a user
charges the battery when voltage ses. When the startup y for the r
motor is used as the power supply of the control device 14, time is ed to operate the
starter motor and charge the battery during regular inspections of the generator 15.
[0028] illustrates a frost prevention apparatus 1-1 that includes one each of
the pillar 100, the frost prevention fan 11, the ature sensor 12, the control device
14, the generator 15, and the solar panel 16. However, the number of each of the
constituents is not limited to one. For example, a plurality of frost prevention fans 11
may be provided on one pillar 100, or a plurality of pillars 100 including frost prevention
fans 11 may be provided in the field. Additionally, one or a plurality of control devices
14 may control ities of frost prevention fans 11 and generators 15.
[0029] The functional configuration of the control device 14 is described using
FIGS. 2 and 3. As illustrated in the configuration of the control device 14
includes a type acquirer 141, a storage 142, a detection signal receiver 143, a growth
stage determiner 144, and a frost prevention fan controller 145. The control box 43
illustrated in or the like, realizes these functions.
[0030] In one example, the control box 43 includes a central processing unit (CPU),
a random-access memory (RAM), a non-volatile memory, an ace for connecting to
other devices, and the like. The CPU loads a control program stored in the non-volatile
memory into the RAM. In accordance with the loaded control program, the CPU
executes s processes of the type acquirer 141, the detection signal er 143, the
growth stage determiner 144, and the frost prevention fan controller 145. The e
142 is constituted by latile memory.
The battery 18 stores the electricity generated by the solar panel 16, and
supplies power to the control device 14. The battery 18 may be provided inside the
l device 14.
[0032] Returning to the type er 141 acquires type information
ting the type of the crops A cultivated in the field. The type acquirer 141 may be
constituted by an input device such as a touch panel, buttons, or the like, or may be
constituted by a communication device that receives the type information. onally,
in cases in which the type of the crops A cultivated in the field is determined and a frost
prevention apparatus 1-1 dedicated to that type of crops is used, the control device 14
need not include the type acquirer 141.
The storage 142 stores the type information acquired by the type acquirer
141. Reference information indicating references for determining the growth stages,
and growth limit temperature information indicating the growth limit temperature for
each growth stage by type of crops are stored in advance in the storage 142. The
reference information and the growth limit temperature information are described in
detail later.
The detection signal receiver 143 receives a signal indicating the detection
value (the low position average temperature) from the temperature sensor 12. The
detection signal receiver 143 stores low position average temperature information
indicating the low position average temperature in the e 142.
[0035] The growth stage determiner 144 ines the t growth stage of the
crops A on the basis of the low position average temperature indicated by the low
position average temperature information stored in the storage 142.
Next, an example of a determination method of the growth stage is
described. The growth stage determiner 144 ines whether the low position
e temperature exceeds the reference temperature. If the low position average
temperature exceeds the reference ature, the growth stage determiner 144
calculates the difference between the reference temperature and the low on average
temperature, and calculates a cumulative value from a calculation start day to the present
day. Hereinafter, the term “cumulative value” refers to a cumulative value of
ences between the reference temperature and the low position e temperature,
from the calculation start day to the present day. The range of the cumulative value for
each growth stage is determined by the type of crops, and the growth stage determiner
144 determines that the growth stage having the range in which the ated cumulative
value is included is reached.
[0037] The reference information stored in the storage 142 includes reference
temperature information indicating the reference temperature by the type of crops, and
growth stage ation indicating the range of the cumulative value for each growth
stage by the type of crops.
Next, the growth stage information included in the reference information
stored in the storage 142 is described using In one example, tea has the growth
stages of “unsprouted”, “sprouting stage”, “one-leaf stage”, “two-leaf stage”, “three-leaf
, “four-leaf stage”, “five-leaf stage”, and “harvest stage.” The range of the
cumulative value to reach each growth stage is 0°C to 40°C, 41°C to 50°C, 51°C to 80°C,
81°C to 120°C, 121°C to 180°C, 181°C to 230°C, 231°C to 280°C, and 281°C to 310°C.
The storage 142 stores, as the nce information by the type of crops, the growth
stage information indicating the range of the cumulative value for each growth stage, and
the nce temperature information indicating the reference temperatures such as
rated in
Returning to the growth stage determiner 144 firstly references the
type information stored in the storage 142 and identifies the reference temperature
information and the growth stage ation of the type of the crops A. If the low
position average temperature information is stored in the storage 142, the growth stage
determiner 144 calculates the cumulative value on the basis of the low position average
ature information and the reference temperature information of the type of the
crops A. The growth stage determiner 144 nces the growth stage information of
the type of the crops A, and determines what the current growth stage of the crops A is on
the basis of the cumulative value.
The growth stage determiner 144 sends growth information indicating the
current growth stage of the crops A to the frost prevention fan controller 145. Note that
a configuration is possible in which the growth stage determiner 144 compares a
previously determined growth stage with the presently ined growth stage, and
sends the growth information to the frost prevention fan controller 145 only when the
growth stage has d.
When the frost prevention fan controller 145 receives the growth
information from the growth stage determiner 144, the frost prevention fan ller 145
references the growth limit temperature stored in the storage 142, and determines the first
setting temperature on the basis of the growth limit temperature of the crops A.
Next, the growth limit ature information stored in the storage 142 is
described using illustrates, as an example, the growth limit temperatures
of tea as cited from a publication. The growth limit ature of each of the growth
stages of tea, namely “unsprouted”, “sprouting stage”, “one-leaf stage”, “two-leaf stage”,
-leaf stage”, “four-leaf stage”, “five-leaf stage”, and “harvest stage”, is set to -
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, respectively. The
growth limit temperature information that indicates the growth limit temperature for each
growth stage, such as rated in is stored by the type of crops in the storage
ing to the specific method for determining the first setting
temperature is bed. The frost prevention fan controller 145 firstly references the
type information stored in the storage 142, and fies the growth limit temperature
information of the type of the crops A. When the frost prevention fan controller 145
receives the growth information from the growth stage determiner 144, the frost
prevention fan controller 145 references the growth limit temperature information of the
type of the crops A, and determines the first setting temperature on the basis of the
growth limit temperature that corresponds to the current growth stage of the crops A. In
one example, the first setting temperature is set to the growth limit temperature +3.0°C in
consideration of early se. For example, in a case in which the type of the crops A
is tea, and the current growth stage is unsprouted, the growth limit temperature is -3.0°C
(see and, as such, the first setting temperature is set to 0.0°C.
[0044] If the low position average temperature information is stored in the e
142, the frost prevention fan controller 145 determines whether the low position average
temperature is lower than the first setting temperature. If the low position average
temperature is lower than the first setting temperature, the frost prevention fan controller
145 sends the operation signal to the generator 15. The generator 15 that receives the
ion signal starts up and, when the generator 15 is in a state in which power can be
stably supplied, the generator 15 sends the generation establishment signal to the control
device 14. When the frost prevention fan controller 145 receives the generation
establishment signal from the generator 15, the frost prevention fan controller 145 turns
the omagnetic switch ON, thereby supplying the power of the generator 15 to the
frost prevention fan 11 and starting the operation of the frost prevention fan 11. When
the low position average temperature is greater than or equal to the first setting
temperature + γ, the frost prevention fan controller 145 stops the sending of the operation
. The frost prevention fan controller 145 turns the electromagnetic switch OFF,
thereby ng the supply of the power of the generator 15 to the frost prevention fan
11 and stopping the operation of the frost prevention fan 11. Note that the frost
prevention fan ller 145 may stop the operation of the frost prevention fan 11 when
the generation establishment signal is no longer received from the generator 15 and/or
when a tion ality signal is received from the generator 15.
Next, an example of power supply control of frost prevention fans 11A to
11C by the control device 14 is described using If the low position average
temperature that is the detection value of the temperature sensor 12 (not illustrated) is
lower than the first setting temperature, the control box 43 sends the operation signal to
the generator 15. The generator 15 that receives the operation signal starts up and, when
the generator 15 is in a state in which power can be stably supplied, the generator 15
sends the generation establishment signal to the control device 14. When the l
box 43 es the generation establishment signal from the generator 15, the l
box 43 turns the electromagnetic switch 44 ON. In the example illustrated in the
control box 43 uses a progressive timer 48A and a progressive timer 48B to sequentially
turn ON an electromagnetic switch 44A, an electromagnetic switch 44B, and an
omagnetic switch 44C with a time lag. The power of the generator 15 is
tially supplied with a time lag to the frost prevention fan 11A, the frost prevention
fan 11B, and the frost prevention fan 11C. The frost prevention fan 11A, the frost
prevention fan 11B, and the frost prevention fan 11C start operating with a time lag.
Note that, in a case in which the frost prevention fan 11A, the frost prevention fan 11B,
and the frost prevention fan 11C are to start operating at the same timing, the control
device 14 need not include the electromagnetic switch 44C, the electromagnetic switch
44B, and the electromagnetic switch 44A, and the progressive timer 48A and the
progressive timer 48B.
[0046] When the low position average temperature is greater than or equal to the
first setting temperature + γ, the control box 43 stops the sending of the operation signal,
and turns the electromagnetic switch 44C, the electromagnetic switch 44B, the
electromagnetic switch 44A, and the electromagnetic switch 44 OFF. The generator 15
stops when the operation signal is no longer received. As a result, the supply of the
power of the generator 15 to the frost prevention fan 11C, the frost prevention fan 11B,
and the frost prevention fan 11A stops, and the operations of the frost prevention fan
11A, the frost prevention fan 11B, and the frost prevention fan 11C stop. Additionally,
a configuration is possible in which the control box 43 turns the electromagnetic switch
44C, the omagnetic switch 44B, the electromagnetic switch 44A, and the
electromagnetic switch 44 OFF when the generation ishment signal is no longer
ed from the generator 15 and/or when the generation ality signal is received
from the generator 15, in addition to when the low position average ature is greater
than or equal to the first setting temperature + γ.
An earth-leakage circuit breaker 45 interrupts the circuit when leakage is
detected. A wiring circuit breaker 46A, a wiring circuit breaker 46B, and a wiring
circuit breaker 46C interrupt the circuit when overcurrent is ed. A transformer 47
transforms the power of the generator 15 to control voltage (AC 200V) of the frost
prevention fan 11A, the frost prevention fan 11B, and the frost tion fan 11C, and
supplies the control voltage.
The control device 14 is not limited to one device, and may be realized by a
plurality of devices. For example, a frost tion fan control device that includes the
functions of the frost prevention fan controller 145 illustrated in may be provided.
In one example, such a frost prevention fan control device has the same configuration as
the control device 14 illustrated in
Next, examples of growth stage ination processing and generator
control processing that are the main processings executed by the control device 14 are
described using FIGS. 6 and 7. Firstly, the flow of the growth stage determination
processing executed by the control device 14 is described using The growth
stage determination processing illustrated in starts when the power from the
battery 18 is supplied to the control device 14. The growth stage determiner 144 of the
control device 14 determines whether the low position average temperature information
is stored in the storage 142 (step S11).
If the low position average temperature information is not stored in the
e 142 (step S11; NO), the growth stage determiner 144 s step S11 and waits
for the low position e temperature information to be stored in the storage 142. If
the low position average ature information is stored in the storage 142 (step S11;
YES), the growth stage iner 144 references the reference temperature information
included in the reference information and the type information stored in the storage 142,
and determines whether the low position average temperature exceeds the reference
ature (step S12). If the low position average temperature does not exceed the
nce temperature (step S12; NO), the growth stage determiner 144 repeats steps S11
and S12, and waits for the low position average temperature to exceed the reference
temperature. If the low position average temperature exceeds the reference temperature
(step S12; YES), the growth stage determiner 144 calculates the difference between the
reference temperature and the low position average temperature (step S13), and calculates
the tive value (step S14).
The growth stage determiner 144 nces the growth stage information
ed in the reference information of the type of the crops A, and determines the
current growth stage of the crops A (step S15). The growth stage determiner 144 sends
the growth information indicating the current growth stage of the crops A to the frost
prevention fan controller 145 (step S16). If the power supply of the control device 14 is
not OFF (step S17; NO), step S11 is returned to and steps S11 to S17 are repeated. If
the power supply is OFF (step S17; YES), the processing is ended. In a configuration in
which the growth stage determiner 144 sends the growth information to the frost
prevention fan controller 145 only when the growth stage has changed, a step for
comparing the previously ined growth stage and the presently determined growth
stage is provided after step S15, and step S16 is executed only when the growth stage has
changed.
[0052] In step S16, the frost prevention fan ller 145 that receives the growth
information references the type information and the growth limit temperature information
stored in the storage 142, and determines the first setting temperature on the basis of the
growth limit temperature that corresponds to the current growth stage of the crops A.
Next, the flow of the generator control sing executed by the control
device 14 is described using The generator control processing illustrated in starts when the power from the y 18 is supplied to the control device 14. In the low position average temperature is L, and the first setting temperature is α. The
frost prevention fan controller 145 of the control device 14 determines r the low
position average temperature L is lower than the first setting temperature α (step S21).
[0054] If the low position average temperature L is greater than or equal to the first
setting temperature α (step S21; NO), the frost prevention fan controller 145 repeats step
S21 and waits for the low position average temperature L to become lower than the first
setting temperature α. If the low position average temperature L is lower than the first
g temperature α (step S21; YES), the frost prevention fan controller 145 sends the
operation signal to the tor 15 (step S22). The generator 15 receives the operation
signal and starts up and, when the generator 15 is in a state in which power can be stably
ed, the generator 15 sends the generation establishment signal to the control device
14. If the generator 15 does not receive the generation establishment signal (step S23;
NO), the frost prevention fan controller 145 repeats step S23 and waits for the receipt of
the generation establishment . If the generator 15 es the generation
establishment signal (step S23; YES), the frost prevention fan controller 145 turns the
electromagnetic switch ON, thereby supplying the power of the generator 15 to the frost
prevention fan 11 and starting the operation of the frost prevention fan 11 (step S24).
If the low position average temperature L is lower than the first setting
temperature α + γ (step S25; NO), the frost prevention fan controller 145 repeats step S25
and waits for the low on average temperature L to become r than or equal to
the first setting temperature α + γ. If the low position average ature L is greater
than or equal to the first setting temperature α + γ (step S25; YES), the frost prevention
fan controller 145 stops the sending of the operation signal to the generator 15 (step S26).
The generator 15 stops when the operation signal is no longer received. The frost
prevention fan controller 145 turns the electromagnetic switch OFF, thereby stopping the
supply of the power of the generator 15 to the frost prevention fan 11 and stopping the
operation of the frost prevention fan 11 (step S27). If the power supply of the control
device 14 is not OFF (step S28; NO), step S21 is returned to and steps S21 to S28 are
repeated. If the power supply is OFF (step S28; YES), the sing is ended.
In the case of step S25; NO, the frost prevention fan controller 145 may
determine whether the generation establishment signal is no longer ed from the
generator 15 or whether the generation abnormality signal, which indicates that
generation has stopped, is received from the generator 15, and transition to step S26 when
the generation establishment signal is no longer received from the generator 15 or the
generation ality signal is received from the generator 15.
According to the frost prevention apparatus 1-1 of Embodiment 1, it is
possible to use the frost prevention fan, even in locations where it is difficult to procure
an external power supply. Additionally, a frost prevention device can be provided that
determines the first setting temperature on the basis of the growth limit temperature
corresponding to the current growth stage of the crops A and, as such, can respond to
changes of the growth stages of the crops resulting from changes in the natural
environment.
[0058] Embodiment 2
In Embodiment 2, a frost prevention tus 1-2 includes a differential
temperature operation function. The differential temperature ion function is a
function that causes the frost prevention fan 11 to e only when it is estimated that
the inversion layer X is occurring.
[0059] is a schematic drawing illustrating the uration of the frost
prevention apparatus 1-2 according to Embodiment 2 of the present disclosure. The
frost prevention apparatus 1-2 is the frost prevention apparatus 1-1 of Embodiment 1,
with the addition of a temperature sensor 13 that is provided on the upper portion of the
pillar 100.
[0060] The ature sensor 13 detects air temperature at the height at which the
inversion layer X occurs. The temperature sensor 13 calculates the average value of one
day of measured values of the air temperature at the height at which the inversion layer X
occurs. Hereinafter, the average value of one day of the measured values of the
temperature sensor 13 is referred to as a “high on e temperature.” The
ature sensor 13 sends the high position average temperature to the control device
14 as a detection value. Note that processing may be carried out in which the
temperature sensor 13 sends the measured values to the control device 14, and the control
device 14 calculates the average value of one day. In one example, the temperature
sensor 13 is provided at a position that is not affected by wind from the frost tion
fan 11 and/or naturally occurring winds. The temperature sensor 13 is an example of
the second sensor of the present disclosure.
[0061] The control device 14 includes the differential temperature operation
function. Typically, since air temperature decreases as the altitude rises, the high
position average ature < the low position average temperature. Accordingly, in a
case in which the high position e temperature > the low position e
temperature, there is a difference n the high position average temperature and the
low position average temperature that is the opposite of the typical temperature difference
based on altitude differences. Therefore, an estimation can be made that the inversion
layer X is ing near the altitude of the ature sensor 13. As such, when the
low position average temperature < the first setting temperature and, also, the high
position average temperature - the low position average temperature > a second setting
temperature, the control device 14 determines that an inversion layer X effective for
ting frost is occurring and starts up the generator 15 to start the operation of the
frost prevention fan 11. The second setting temperature is determined in advance.
When the detection value of the high position average temperature - the ion value
of the low position average temperature ≤ the second setting temperature - η, or the low
position average temperature ≥ the first setting temperature + γ, the control device 14
determines that the inversion layer X is not occurring or is not effective for preventing
frost and stops the generator 15, thereby stopping the operation of the frost prevention fan
11. However, when the low position average temperature < the growth limit
ature, the control device 14 causes the frost prevention fan 11 to operate even
when the detection value of the high position average temperature - the detection value of
the low position average temperature ≤ the second setting temperature. The other
configurations are the same as in Embodiment 1.
Next, the functional configuration of the control device 14 of Embodiment 2
is described using The functional configuration of the control device 14 of
Embodiment 2 is the same as the control device 14 of Embodiment 1.
In addition to the signal indicating the detection value (the low position
average temperature) from the ature sensor 12, the detection signal receiver 143
receives a signal indicating the detection value (the high position average temperature)
from the temperature sensor 13. The detection signal receiver 143 stores the low
position average temperature information indicating the low position average temperature
and high position average temperature information indicating the high position average
temperature in the storage 142 of the control device 14.
If the low position average temperature information and the high position
average temperature information are stored in the storage 142, the frost tion fan
ller 145 sends the ion signal to the generator 15 when the low on
average temperature is lower than the first g temperature and, also, the value
obtained by subtracting the low position average temperature from the high position
average ature is greater than the second setting ature. The generator 15
that receives the operation signal starts up and, when the generator 15 is in a state in
which power can be stably supplied, the generator 15 sends the generation establishment
signal to the control device 14. When the frost prevention fan controller 145 receives
the generation establishment signal from the generator 15, the frost prevention fan
controller 145 turns the electromagnetic switch ON, thereby ing the power of the
generator 15 to the frost prevention fan 11 and starting the operation of the frost
prevention fan 11.
When the low position average temperature is greater than or equal to the
first setting temperature + γ, or when the value obtained by subtracting the low position
average temperature from the high position average temperature is less than or equal to
the second setting temperature - η, the frost prevention fan controller 145 stops the
g of the operation signal to the generator 15. η is any value greater than or equal
to 0. The generator 15 stops when the operation signal is no longer received. The frost
prevention fan controller 145 turns the electromagnetic switch OFF, thereby stopping the
supply of the power of the generator 15 to the frost prevention fan 11 and stopping the
ion of the frost prevention fan 11. The other functions are the same as in
Embodiment 1.
Next, the generator control processing executed by the control device 14 is
bed using . The generator control processing illustrated in starts
when the power from the y 18 is supplied to the control device 14. In , the
low position average temperature is L, the high on average temperature is H, the
first setting temperature is α, and the second g temperature is β. The frost
prevention fan controller 145 of the control device 14 determines whether the low
position average temperature L is lower than the first setting temperature α (step S31).
If the low position average temperature L is greater than or equal to the first
setting temperature α (step S31; NO), the frost prevention fan controller 145 s step
S31 and waits for the low position average temperature L to become lower than the first
setting ature α. If the low position average temperature L is lower than the first
setting temperature α (step S31; YES), the frost prevention fan ller 145 determines
whether the value obtained by subtracting the low position average ature L from
the high position average temperature H is greater than the second setting temperature β
(step S32).
If the value obtained by subtracting the low position average temperature L
from the high position average temperature H is less than or equal to the second setting
temperature β (step S32; NO), the processing of step S40 is ed. If the value
obtained by subtracting the low position average temperature L from the high position
average temperature H is greater than the second setting temperature β (step S32; YES),
the frost prevention fan controller 145 sends the operation signal to the generator 15 (step
S33). The generator 15 receives the operation signal and starts up and, when the
generator 15 is in a state in which power can be stably supplied, the generator 15 sends
the generation establishment signal to the control device 14. If the generator 15 does not
receive the generation establishment signal (step S34; NO), the frost prevention fan
controller 145 repeats step S34 and waits for the t of the generation establishment
signal. If the generator 15 receives the generation establishment signal (step S34; YES),
the frost prevention fan controller 145 turns the electromagnetic switch ON, thereby
ing the power of the generator 15 to the frost prevention fan 11 and starting the
ion of the frost prevention fan 11 (step S35).
[0069] If the value obtained by subtracting the low position average temperature L
from the high on average temperature H is greater the second setting temperature β -
η (step S36; NO), the frost prevention fan ller 145 determines whether the low
position average temperature L is greater than or equal to the first setting temperature α +
γ (step S37). If the low position average temperature L is lower than the first setting
temperature α + γ (step S37; NO), the frost tion fan controller 145 repeats steps
S36 and S37 and waits for the value obtained by subtracting the low position average
temperature L from the high position average temperature H to become less than or equal
to the second setting ature β - η, or the low on average temperature L to
become r than or equal to the first setting temperature α + γ.
[0070] If the value obtained by subtracting the low position average ature L
from the high position average temperature H is less than or equal to the second setting
temperature β - η (step S36; YES), or the low position average temperature L is greater
than or equal to the first setting temperature α + γ (step S37; YES), the frost prevention
fan controller 145 stops the sending of the operation signal to the generator 15 (step S38).
The generator 15 stops when the operation signal is no longer received. The frost
prevention fan controller 145 stops the supply from the generator 15 to the frost
prevention fan 11, and stops the operation of the frost prevention fan 11 (step S39). If
the power supply of the control device 14 is not OFF (step S40; NO), step S31 is returned
to and steps S31 to S40 are repeated. If the power supply is OFF (step S40; YES), the
processing is ended.
In the case of step S37; NO, the frost prevention fan controller 145 may
determine whether the generation establishment signal is no longer received from the
tor 15 or whether the generation abnormality , which indicates that
generation has stopped, is received from the generator 15, and transition to step S38 when
the generation establishment signal is no longer received from the generator 15 or the
generation abnormality signal is received from the generator 15.
[0072] ing to the frost prevention apparatus 1-2 of Embodiment 2, it is
possible to use the frost prevention fan, even in ons where it is not possible to
procure an external power supply. Additionally, power saving is enabled due to the
frost prevention fan being caused to operate only when the inversion layer X is estimated
to be occurring.
[0073] Embodiment 3
In Embodiment 2, the frost tion apparatus 1-2 does not start up the generator
and does not cause the frost tion fan 11 to operate when the detection value of
the high position average temperature - the detection value of the low position average
temperature ≤ the second setting temperature. That is, when the ion layer X is not
occurring, even if the low position average temperature < the first setting temperature, the
generator 15 is not started up and the frost prevention fan 11 is not caused to operate.
However, when the low on average temperature < the growth limit temperature, the
control device 14 causes the frost prevention fan 11 to operate even when the detection
value of the high position average temperature - the detection value of the low position
average temperature ≤ the second setting temperature. In contrast, in ment 3,
frost prevention means other than the frost prevention fan 11 may be caused to operate
when the ion value of the high position average temperature - the detection value of
the low position average temperature ≤ the second setting temperature, even if the low
position average temperature < the first setting temperature.
is a schematic drawing of a field and a frost prevention apparatus
according to Embodiment 3 of the present sure. In addition to the configuration of
the frost prevention apparatus 1-2, the frost prevention apparatus 1-3 further includes a
temperature g heater 17 as a field heater. The control device 14 starts the
operation of the heater 17 when the low position average temperature < the first setting
temperature and, also, the detection value of the high position e temperature - the
detection value of the low position average temperature ≤ the second g temperature.
The control device 14 stops the operation of the heater 17 when the low position average
temperature ≥ the first setting temperature + γ or when the detection value of the high
position average temperature - the detection value of the low position average
temperature > the second setting temperature + η.
Next, the functional configuration of the l device 14 of Embodiment 3
is described using . The configuration of the control device 14 of Embodiment 3
is the same as the control device 14 of Embodiment 2.
If the low position average temperature information and the high position
average ature information are stored in the storage 142, the frost prevention fan
controller 145 turns the power of the heater 17 ON when the low position average
temperature is lower than the first setting temperature and, also, the value obtained by
subtracting the low position e temperature from the high position average
temperature is less than or equal to the second g temperature. The frost prevention
fan controller 145 turns the power of the heater 17 OFF when the low position average
temperature is greater than or equal to the first setting temperature + γ, or when the value
obtained by subtracting the low position e temperature from the high on
average ature is greater than the second setting temperature + η. The other
functions are the same as in Embodiment 2.
The power supply of the heater 17 may be the generator 15, the battery 18,
the startup battery for the starter motor of the generator 15, or a battery of the heater 17
itself.
Next, generator and heater control processing executed by the control device
14 is described using . The generator and heater control processing illustrated in
starts when power is supplied to the control device 14. In , the low
position average ature is L, the high on average temperature is H, the first
setting temperature is α, and the second setting temperature is β. Since steps S51 to S59
are the same as steps S31 to S39 rated in , description thereof is foregone.
[0079] In step S52, if the value obtained by subtracting the low on average
ature L from the high position average temperature H is less than or equal to the
second setting temperature β, the frost prevention fan controller 145 starts the operation
of the heater 17 (step S60). If the value obtained by subtracting the low position
average temperature L from the high on average temperature H is less than or equal
to the second setting temperature β + η (step S61; NO) and, also, the low position average
temperature L is lower than the first setting ature α + γ (step S62; NO), the frost
tion fan controller 145 repeats steps S61 and S62, and waits for the value obtained
by subtracting the low position average temperature L from the high position average
temperature H to become greater than the second setting ature β + η, or the low
position average temperature L to become greater than or equal to the first setting
temperature α + γ.
If the value obtained by subtracting the low position average temperature L
from the high position average temperature H is greater than the second setting
ature β + η (step S61; YES), or the low position average temperature L is greater
than or equal to the first setting temperature α + γ (step S62; YES), the frost prevention
fan controller 145 stops the operation of the heater 17 (step S63). If the power supply of
the control device 14 is not OFF (step S64; NO), step S51 is returned to and steps S51 to
S64 are repeated. If the power supply is OFF (step S64; YES), the processing is ended.
According to the frost prevention apparatus 1-3 of Embodiment 3, it is
possible to use the frost prevention fan, even in locations where it is not le to
procure an external power supply. Additionally, it is possible to prevent freezing and
frost damage to the crops A, even when the inversion layer X is not occurring.
In the embodiments described above, the first setting temperature is
determined on the basis of the growth limit temperature corresponding to the growth
stage of the crops A of the field. However, the present disclosure is not limited thereto.
It is sufficient that the first setting temperature is determined in correspondence with the
growth stage of the crops A of the field. For example, the first setting temperature
corresponding to each of the “unsprouted”, “sprouting stage”, eaf stage”, eaf
stage”, “three-leaf stage”, “four-leaf stage”, “five-leaf stage”, and “harvest stage” of tea
may be ined in advance such as, for example, 1°C, 2°C, 3°C, 4°C, 5°C, and 6°C.
In this case, instead of the growth limit ature information, the storage 142 of the
control device 14 stores first setting temperature information that tes the first setting
temperature determined in advance for each growth stage by the type of the crops.
In the ments described above, the growth stage is determined using
the cumulative value. r, the present disclosure is not limited thereto. Any
method may be used provided that it is possible to determine the growth stage of the
crops from the temperature of the leaf surface, or the temperature near the leaf surface, of
the crops A.
In ment 1, the frost prevention fan controller 145 of the control
device 14 determines whether to operate the frost prevention fan 11 on the basis of the
low position average temperature that is the average value of one day of the measured
values of the temperature sensor 12. However, the present disclosure is not limited
thereto. For example, the frost prevention fan controller 145 may ine whether to
operate the frost prevention fan 11 on the basis of an average value of one hour of the
measured values of the temperature sensor 12. With such a configuration, the frost
prevention fan 11 can be ently operated when, for example, the low position average
temperature is below the first setting temperature only in g hours when the air
temperature is lower. In Embodiments 2 and 3 as well, configurations are possible in
which the generator 15 is controlled on the basis of the average value of one hour of the
low position average temperature and the average value of one hour of the high on
average temperature.
In the embodiments described above, the control device 14 continuously
sends the operation signal to the generator 15 when the low position average ature
is lower than the first g temperature, and the control device 14 stops the sending of
the operation signal to the generator 15 when the low position average temperature is
greater than or equal to the first setting ature + γ. However, the present
disclosure is not limited thereto. A configuration is possible in which the control device
14 singly sends the operation signal to the generator 15 when the low position average
temperature is lower than the first setting temperature, and the control device 14 singly
sends a stop signal to the generator 15 when the low position average temperature is
greater than or equal to the first setting temperature + γ. In this case, the generator 15
starts up when the operation signal is received, and ion is stopped when the stop
signal is received.
[0086] The foregoing describes some example embodiments for atory
purposes. Although the foregoing discussion has presented specific embodiments,
persons d in the art will recognize that changes may be made in form and detail
without departing from the broader spirit and scope of the invention. Accordingly, the
specification and drawings are to be regarded in an illustrative rather than a restrictive
sense. This detailed ption, therefore, is not to be taken in a limiting sense, and the
scope of the ion is defined only by the included claims, along with the full range of
equivalents to which such claims are entitled.
Reference Signs List
1-1, 1-2, 1-3 Frost prevention apparatus
11, 11A, 11B, 11C Frost prevention fan
12, 13 Temperature sensor
14 Control device
Generator
16 Solar panel
17 Heater
18 Battery
43 Control box
44, 44A, 44B, 44C omagnetic switch
45 Earth-leakage circuit r
46A, 46B, 46C Wiring circuit breaker
47 Transformer
48A, 48B Progressive timer
100 Pillar
141 Type acquirer
142 Storage
143 Detection signal receiver
144 Growth stage determiner
145 Frost prevention fan controller
A Crops
X Inversion layer
Claims (10)
1. A frost prevention tus, comprising: a frost prevention fan that is provided at a height at which an ion layer of a field , and that blows wind down on the field; 5 a first sensor that detects at least a temperature of a leaf surface, or a temperature near the leaf surface, of crops of the field; a second sensor that detects an air temperature at a height at which the inversion layer ; a tor that is a drive source of the frost prevention fan; 10 a control device that sends, based on an average value of a predetermined period of detection values of the first sensor and an average value of a predetermined period of detection values of the second sensor, an operation signal causing the generator to operate; and a battery that supplies power to the control device; 15 wherein the l device sends the operation signal to the generator when the average value of the predetermined period of the detection values of the first sensor is lower than a first setting temperature and a value obtained by subtracting the average value of the predetermined period of the detection values of the first sensor from the average value of 20 the predetermined period of the detection values of the second sensor is greater than a second g temperature, supplies power of the generator to the frost prevention fan when a generation establishment signal is received from the generator, and stops sending of the operation signal to the generator when the average value of the predetermined period of the detection values of the first sensor is greater than or equal to a value 25 obtained by adding a first value to the first setting temperature or when the value obtained by subtracting the average value of the predetermined period of the detection values of the first sensor from the average value of the predetermined period of the detection values of the second sensor is less than or equal to a value obtained by cting a second value from the second setting temperature.
2. The frost prevention apparatus according to claim 1, n 5 the control device determines a growth stage of the crops of the field based on the average value of the predetermined period of the detection values of the first sensor, and determines the first setting temperature that ponds to the determined growth stage of the crops of the field.
3. The frost tion apparatus according to claim 2, wherein the control device determines the first setting temperature based on a growth limit temperature that corresponds to the growth stage of the crops of the field determined based on the 15 average value of the predetermined period of the detection values of the first sensor.
4. The frost prevention apparatus according to claim 2 or 3, wherein the control device in a case in which an average value of one day of the detection values of the 20 first sensor exceeds a reference temperature, ates a difference between the reference temperature and the average value of one day of the detection values of the first sensor, and determines the growth stage of the crops of the field based on a cumulative value from a calculation start day of the difference to a present day. 25 5. The frost prevention apparatus according to claim 4, further comprising: in the field, a heater for raising temperature, wherein the control device starts operation of the heater when the average value of the predetermined period of the detection values of the first sensor is lower than the first setting temperature and the value ed by subtracting the average value of the predetermined period of the detection values of the first sensor from the average value of the predetermined period
5. Of the detection values of the second sensor is less than or equal to the second setting temperature, and stops the operation of the heater when the average value of the ermined period of the detection values of the first sensor is greater than or equal to the value obtained by adding the first value to the first setting temperature or when the 10 value obtained by subtracting the average value of the predetermined period of the ion values of the first sensor from the average value of the predetermined period of the detection values of the second sensor is greater than a value obtained by adding the second value to the second setting temperature. 15
6. A frost prevention fan control device that sends, based on an average value of a predetermined period of detection values of a first sensor that detects at least a temperature of a leaf surface, or a temperature near the leaf surface, of crops of a field and an average value of a predetermined period of ion values of a second sensor that detects an air temperature at a height at which the inversion layer of the field occurs, 20 to a generator that is a drive source of a frost prevention fan that is ed at a height at which an inversion layer of the field occurs and that blows wind down on the field, an operation signal causing the generator to operate, the frost prevention fan control device sending the ion signal to the generator when the average value of the predetermined period of the detection values of the first 25 sensor is lower than a first setting temperature and a value obtained by subtracting the average value of the predetermined period of the detection values of the first sensor from the e value of the predetermined period of the detection values of the second sensor is greater than a second setting ature, supplying power of the generator to the frost prevention fan when a generation establishment signal is received from the generator, and stopping sending of the operation signal to the generator when the average value of the predetermined period of the ion values of the first sensor is greater than 5 or equal to a value obtained by adding a first value to the first setting ature or when the value obtained by subtracting the average value of the predetermined period of the detection values of the first sensor from the average value of the predetermined period of the detection values of the second sensor is less than or equal to a value ed by subtracting a second value from the second setting temperature.
7. A frost prevention fan control method to be executed by a frost prevention fan control device that, based on an average value of a predetermined period of ion values of a first sensor that detects at least a ature of a leaf surface, or a temperature near the leaf e, of crops of a field and an average value of a 15 predetermined period of detection values of a second sensor that detects an air temperature at a height at which an inversion layer of the field occurs, sends an operation signal causing a generator to e to the generator, the generator being a drive source of a frost prevention fan that is provided at the height at which the inversion layer of the field occurs and that blows wind down on the field, the method including: 20 sending the operation signal to the generator when the average value of the predetermined period of the detection values of the first sensor is lower than a first setting temperature and a value obtained by subtracting the average value of the predetermined period of the detection values of the first sensor from the average value of the predetermined period of the detection values of the second sensor is greater than a second 25 setting temperature; receiving a generation establishment signal from the generator; supplying power of the generator to the frost prevention fan; and stopping sending of the operation signal to the generator when the average value of the predetermined period of the detection values of the first sensor is greater than or equal to a value obtained by adding a first value to the first setting temperature or when the value obtained by subtracting the average value of the predetermined period of the 5 detection values of the first sensor from the e value of the predetermined period of the detection values of the second sensor is less than or equal to a value obtained by subtracting a second value from the second setting ature.
8. A frost prevention apparatus as claimed in claim 1, ntially as herein 10 described with reference to any embodiment disclosed.
9. A frost prevention fan control device as claimed in claim 6, substantially as herein described with reference to any embodiment disclosed. 15
10. A frost prevention face control method as claimed in claim 7, substantially as herein described with nce to any embodiment disclosed. 㻲㻵㻳㻚㻝 㻝 㻙㻝 㻝㻤 㻝㻜㻜 㻾㼑㼜㼘㼍㼏㼑㼙㼑㼚㼠㻌㻿㼔㼑㼑㼠 㻲㻵㻳㻚㻞 62/$5 3$1(/ &21752/ '(9,&( %$77(5< 6725$*( 㻝㻤 7<3( 7<3( 㻝㻠 $&48,5(5 $7,21 㻝㻠㻝 /2: 326,7,21 $9(5$*( 7(03(5$ '(7(&7,21 7(03(5$785( 785( 6,*1$/ ,1)250$7,21 6(1625 5(&(,9(5 5()(5(1&( 㻝㻞 㻝㻠㻟 ,1)250$7,21 *52:7+ *52:7+ /,0,7 㻝㻝 67$*( '(7(50,1(5 7(03(5$785( ,1)250$7,21 )5267 㻝㻠㻠 35(9(17,21 )5267 (/(&752 35(9(17,21 0$*1(7,& )$1 6:,7&+ *(1(5$725 㼑㼙㼑㼚㼠㻌㻿㼔㼑㼑㼠 㻲㻵㻳㻚㻟 %$77(5< 㻝㻤 㻠㻟 &21752/ '(9,&( 㻝㻡 23(5$7,21 6,*1$/ *(1(5$7,21 (67$%/,6+0(17 &21752/ %2; 6,*1$/ *(1(5$725 *(1(5$7,21 $%1250$/,7< 6,*1$/ (/(&752 㻠㻠 0$*1(7,& 6:,7&+ ($57+ ( 㻠㻡 &,5&8,7 %5($.(5 75$16 :,5,1* :,5,1* :,5,1* )250(5 &,5&8,7 7 &,5&8,7 %5($.(5 %5($.(5 %5($.(5 㻠㻣 㻠㻢㻭 㻠㻢㻮 㻠㻢㻯 &21752/ 9
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2018/040450 WO2020090023A1 (en) | 2018-10-31 | 2018-10-31 | Frost protection apparatus, frost protection fan control device, and frost protection fan control method |
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| Publication Number | Publication Date |
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| NZ775312A true NZ775312A (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| NZ775312A NZ775312A (en) | 2018-10-31 | 2018-10-31 | Frost prevention apparatus, frost prevention fan control device, and frost prevention fan control method |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6842133B2 (en) |
| CN (1) | CN112996381B (en) |
| NZ (1) | NZ775312A (en) |
| TW (1) | TWI739191B (en) |
| WO (1) | WO2020090023A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6395463U (en) * | 1986-12-11 | 1988-06-20 | ||
| JP3215238B2 (en) * | 1993-11-02 | 2001-10-02 | 株式会社東芝 | Emergency diesel generator start monitoring system |
| JP3002160B2 (en) * | 1997-08-13 | 2000-01-24 | 利雄 岩田 | Ventilation and power generation method and device |
| JP2002095296A (en) * | 2000-09-11 | 2002-03-29 | Toshiba Corp | Diesel generator facility auto-pickup controller |
| JP2008061526A (en) * | 2006-09-05 | 2008-03-21 | Seiko Epson Corp | Frost-protective fan system |
| US20100014975A1 (en) * | 2008-07-18 | 2010-01-21 | Hill Daryl G | Mast mounted heating system for a wind machine |
| CN102626026A (en) * | 2012-04-13 | 2012-08-08 | 南京工业职业技术学院 | Precise management system for tea garden based on GPS (Global Positioning System), GIS (Geographic Information System) and sensor network technology |
| JP6341752B2 (en) * | 2014-05-22 | 2018-06-13 | フルタ電機株式会社 | Anti-frost / freezing device |
| JP5908628B1 (en) * | 2015-03-13 | 2016-04-26 | フルタ電機株式会社 | Equipment for growing, growing and protecting tea trees or fruit trees (by avoiding frost and frost damage) and methods for controlling them |
| CN105511527A (en) * | 2015-12-04 | 2016-04-20 | 天水锻压机床(集团)有限公司 | Intelligent control system of orchard frost-prevention machine |
| CN106912337A (en) * | 2015-12-25 | 2017-07-04 | 重庆聚瑞化工新材料有限公司 | A kind of Multifunction orchard frost preventing machine |
| CN106818340B (en) * | 2016-12-08 | 2019-11-22 | 天水锻压机床(集团)有限公司 | Orchard frost preventing machine intelligent gas assisted heating device and its control system |
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| TWI739191B (en) | 2021-09-11 |
| WO2020090023A1 (en) | 2020-05-07 |
| JP6842133B2 (en) | 2021-03-17 |
| CN112996381A (en) | 2021-06-18 |
| CN112996381B (en) | 2022-10-28 |
| TW202018191A (en) | 2020-05-16 |
| JPWO2020090023A1 (en) | 2021-02-15 |
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Free format text: PATENT RENEWED FOR 1 YEAR UNTIL 31 OCT 2024 BY AJ PARK Effective date: 20230823 |