JPS6214729A - Environmental control apparatus of plant growing chamber - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an environmental control device for a plant growing room that controls the temperature in a greenhouse or a greenhouse dedicated to growing a plant to the optimum state for growing CO2-concentrated substances. Regarding.

[Technical background of the invention ■] The photosynthetic rate of plants is approximately proportional to the intensity of solar radiation up to the light saturation point, and increases as the temperature rises. In this case, it is necessary to increase CO2i Agriculture III in the air according to the photosynthesis rate. Focusing on such circumstances, the environment of the conventional plant growing room 1
1. The control device measures the amount of solar radiation using a solar radiation detector;
Based on the measured values, the temperature control device and C
It was configured to increase the photosynthesis rate by controlling the operation of the O2 supply device.

[Problems with Background Art] By the way, there is a situation in which it takes a certain amount of time for the temperature and CO2 degree in the entire area of the plant growing room to reach the set values after the operation of the temperature control device and the CO2 supply device is started. Despite this, in the conventional configuration described above, the operation of the temperature control device and the CO2 supply device is controlled based on the measured value of solar radiation before the current time, so the temperature and CO2 concentration are constantly increased over time. There is a problem in that the adjustment is delayed and timely control cannot be performed.

[Purpose of the Invention] The present invention has been made in consideration of the above circumstances, and therefore, its purpose is to reduce the temperature of indoor air in a plant growing room and CO2C=
To provide an environment control device for a plant growing room which can adjust the temperature without time delay and constantly maintain the environment in the plant growing room in an optimum state.

[Summary of the Invention] The present invention configures a temperature control device to be controlled based on the temperature in a plant growing room and a predicted temperature predicted based on the amount of solar radiation before measuring the temperature, and a CO2 supply device, CO2 m degree in the plant growing room and its COz't = predicted CO271 predicted by tJ on the day rJJ [F] before degree measurement
This system is designed to control the indoor air temperature and temperature based on 4 degrees Celsius, which is the optimum indoor air temperature and temperature for promoting photosynthesis.
The adjustment is made while predicting the degree of OZ tm.

[Embodiment 1 of the Invention Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, in Fig. 2 showing the overall electrical configuration, 1 is a solar radiation measuring device that measures the day 111Fjfjl in the plant growing room (not shown), and 2 is a hot stone measuring device that measures the temperature of the indoor air in the plant growing room. The device 3 is a CO2 measuring device that measures 11 degrees of CO2 in indoor air. These measuring instruments 1, 2.3 intermittently measure the temperature and CO2 concentration at each measurement time interval, which will be described later, and the output signals from each measuring instrument 1.2.3 are analog Brexa 4 and A/D
The signals are sequentially input to the microcomputer 6 via the converter 5.

ff 7 inputs a time signal to the microcomputer 6
It is ¥π1. Reference numeral 8 denotes a heating device for supplying hot air into the plant growing room, and numeral 9 a cooling device for supplying cold air into the plant growing room.This cooling device and the heating device 8 constitute a temperature control device. 10 is a C02 supply device that supplies CO2 into the plant growing room, and 11 is a fan device that causes convection of indoor air in the plant growing room. These heating devices 8 degrees cooling devices 9. The operation of the CO2 supply device 10 and the fan device 11 is controlled by the microcomputer 6 via the relay 12 as described later.

Here, the configuration of the microcomputer 6 will be explained based on FIG. 1. Reference numeral 13 denotes a measurement time interval setting means for setting the measurement time interval of each measuring device 1.2.3, which allows the user to appropriately set the measurement time interval based on the internal volume of the plant growth chamber. Reference numeral 14 denotes a photosynthesis ml prediction means for predicting the optimal temperature of indoor air that promotes the photosynthetic action of plants, and this predicts the optimal temperature based on the average solar radiation measured by the solar radiation detector 1. Specifically, as shown in Figure 3, if the average solar radiation m at t2 o'clock is 82, and the average solar radiation m at 13 o'clock, which is the next measurement time at 12 o'clock, is 83, then at t4 o'clock Forecast date of IJffi
Sa'' is calculated using the following equation (1).

Sa' - (tt j2) 152 13-12 (1) Then, based on this predicted date Q'JffiSa', the predicted temperature 03' at the next measurement time at 13:00 is calculated by the following equation (2). Calculate with.

θ3' = SV4 +aS4' --(2) Here, SV4 is the temperature W unit price at t4 (see Figure 4)
, a are constants. On the other hand, in FIG. 1, 15 is a translocation temperature prediction means for predicting the optimum temperature of indoor air that promotes the translocation effect of photosynthetic substances, and this is a translocation promotion time period (fourth
(see figure), the predicted cumulative solar radiation is calculated in the same manner as described above based on the cumulative solar radiation from sunrise, and the predicted temperature is divided based on this predicted cumulative solar radiation 3. Furthermore, in FIG. 1, 16 is a COzW degree prediction means for predicting the optimum COZ of 14 degrees in indoor air, and if the aforementioned measurement time interval is L (see FIG. 3), then the CO2Ffn degree prediction means 1
．． Step 6 calculates the predicted CO2 concentration by multiplying the cumulative Mt. Hiroshidake for each past hour by a coefficient. Reference numeral 17 is a heating head control means, which controls the humidity measuring device 2 during the photosynthesis promotion time period (see Figure 4).
The operation of the heating device 8 and the fan device 11 is controlled based on the temperature in the plant growing room measured by the above method and the predicted temperature predicted by the photosynthetic temperature predicting means 14. Specifically, for example, if the temperature in the plant growing room TI') measured by the temperature measuring device 2 at time t3 is 03, then the heating device 8 and the fan device 11 are The operation is performed for Δt1 time as shown in equation (3).

Δtr=Kt(03'-03) (3) Here, K1 is a constant determined by the internal volume of the plant growth chamber and the capacity of the heating device 8. However, if the following equation (4) holds true, the heating device 8 will not be switched on and off, thereby preventing the heating device 8 from being switched on and off excessively.

03'−Δθ1×θ, 〈θ31+Δθ1・・・・・・(
4) Here, Δθ1 is a preset control temperature range (see FIG. 4). On the other hand, in the commutation promotion room rental, the heating device control means 17 controls the heating device 8 and the fan device 11 in the same manner as described above based on the measured temperature inside the plant growing room and the predicted temperature predicted by the commutation temperature prediction means 15. control the operation of 18 is a cooling device control means, which is a temperature measuring device 2
The temperature inside the plant growing room measured by the photosynthetic temperature prediction means 14. The operation of the cold F7J device 9 and the fan device 11 is controlled based on the predicted temperature measured by the commutation temperature prediction means 15. 19 is a CO2 supply device control means, which controls the CO2m degree and C measured by the CO2 measuring device 3.
The operation of the CO2 supply device 10 and the fan device 11 is controlled based on the predicted CO2 depth predicted by the O2 prediction means 16.

Next, the operation of the above configuration will be explained. Each measuring device 1,
2.3 Average mouth rJJf measured at each time interval
fiSh, indoor air temperature θ, and CozcJ degrees c
Each signal b is input to the microcomputer 6 via the analog multiplexer 4 and the A/D converter 5 in order,
Processing is performed according to a control program stored in the ROM of this microcomputer. The following will explain the control program based on FIGS. 5 to 8, which show flowcharts of the control program. First, as shown in FIG.
In step P2, it is determined whether or not the current time tb is in the photosynthesis promotion time zone, and when the determination result is rYEsJ, that is, in the photosynthesis promotion time zone, L is determined in step P2.
Predicted solar radiation fiisll+ after hours (next measurement time)
1' is expressed based on equation (1).

Thereafter, in step P3, the upper and lower temperatures Δθ are calculated based on the following equation (5).

Δθk =aSb +1' (a is a constant)・(5
) Then, in step P4, it is determined whether the relationship expressed by the following equation (6) is satisfied.

SVk+t+Δθh〉θo (6)
Here, SVb+t is a temperature reference value (see FIG. 4), and 0 is a preset upper limit temperature value. This step P4
If rYEsJ is determined in step P5, θN=θ
If it is determined to be U, and rNOJ, then step P6
It is assumed that t-θi =SVIII +1+Δθh. Thereafter, in step P7, the predicted COZ CJ degree Cζ' is calculated by multiplying the cumulative mouth ejection rate for each past time period by a coefficient, and in step P8. At P9, if the predicted CO2CJ degree C' exceeds the preset CO2 degree upper limit Cu, ct
Let t'=cU. On the other hand, if rNOJ is determined in step P1 and the current time t is determined to be the commutation promotion time period in step PIO, step P11 determines that 1 from sunrise.
? Predicted solar radiation after L hours based on lF3 solar radiation mother? Sζ
+1", the steps P3 to P9 described above are executed. Also, if it is determined as "N○" in step P10, that is, after the translocation promotion time period has elapsed, the next day's photosynthesis promotion time period is executed. Until it reaches θb'=svh+1 in step P12, then steps P7 to P9
Execute.

The heating device 8 then uses the predicted temperature θh′ and the actual measured temperature o.
-0, that is, controlled as shown in FIG. 6 based on h.
In step P13, the temperature θ slope of the indoor air is measured, and in step P14, it is determined whether the actually measured temperature θ exceeds the operation stop level (θh'+Δθa) of the heating device 8. Here, Δθa is the preset control temperature width (fourth
(see figure). If rYESJ is determined in step P14, the heating device 8 is stopped in step P15.

On the other hand, if the determination is "NO", the actual measured temperature θ field is set to the starting level of the heating device 8 (θ koji' - △θa).
It is determined whether or not it is lower than . When the actual temperature θa is equal to or higher than the activation level, the heating device 8 is not activated, and only when the measured temperature θa becomes lower than the activation level, steps P17 to P2 are performed.
1 is executed to start the heating device 8. Step P17
In steps P21 to P21, after determining the temperature difference ea between the predicted temperature θh' and the measured temperature θ1, a constant Ka (this is set in advance based on the internal volume of the plant growth chamber and the capacity of the heating device 8) is added to this temperature difference ea. The operating time Δ1'a is determined by multiplying by Δ1'a, and the heating device 8 and the fan device 11 are operated for this operating time Δta. At this time, if the operating time Δta is shorter than the measurement time interval, the heating and heating device 8 is stopped for the Δta time.

On the other hand, the cooling device 9 is controlled as shown in FIG. 7 based on the predicted temperature θ' and the measured temperature θ.

That is, as shown in steps P22 to P24, it is determined whether or not the measured temperature Ok exceeds the starting level (θ1'+ΔOb) of the cooling device 9, and if it does not, the cooling device 9 is stopped. Make it. Here, Δθb is a preset control temperature range.

On the other hand, if the measured temperature θ exceeds the activation level, steps P25 to P29 are executed and the cooling device 9 is activated. In this case, first find the temperature difference eb between the measured temperature θh and the predicted temperature θN', and then add a constant Kb to this temperature difference eb.
(This is preset based on the internal volume of the plant growth chamber and the capacity of the cooling device 9) to determine the operating time Δtb, and the cooling device 9 and the fan device 10 are operated for this operating time Δtb. At this time, if the operating time Δtb is shorter than the measurement time interval, the cooling device 9 is opened for the Δtb time.
will be stopped.

The CO2 supply device 10 also uses the CO2 concentration ch measured by the CO2 measuring device 3 and the predicted CO2 concentration CL' described above.
is controlled as shown in FIG. That is, as shown in steps P30 to P32, the actual measured CO211 degrees Ct
t is the operation stop level of the CO2 supply device 10 ('+Δ
It is determined whether or not the level exceeds C), and if the level exceeds the operation stop level, the CO2 supply device 10 is brought into a stopped state. Here, ΔC is a preset control temperature range. On the other hand, if rNOJ is determined in step P31, step 7P33T: It is determined whether the measured cOz a+actt is 6 lower than the activation level (Ck-ΔC) of the COz supply device 10, and if it is lower, steps P34 to P38 are executed. By executing this, the CO2 supply device 10 is activated. in this case,
First, Shun calculated the concentration difference ec between the predicted CO2 concentration Ch' and the measured temperature CO2 concentration cb, and added a constant Kc to this temperature difference ec.
(This is the internal volume of the plant growth room and the CO2 supply device 10.
Operating time Δt is calculated by multiplying by (preset according to the capacity of
c is determined, and the CO2 supply device 1 is operated for this operating time Δtc.
0 and the fan device 11 are operated. At this time, if the operating time Δtc is shorter than the measurement time interval, Δt Cl
The near indirect CO2 supply device 10 is stopped. and,
Step P39. As shown on page 40, heating device 8. When the cooling device 9 and the CO2 supply device 10 are all stopped, the fan device 11 is stopped.

The control program described above is executed at regular intervals, thereby maintaining the environment within the plant growing chamber in an optimal state for growing plants.

In the case of this embodiment, unlike the conventional configuration in which the temperature of the indoor air is controlled based on Hita's measured value before the current time, the heating device 8 and the cooling device 9 are controlled at the temperature of the actually measured indoor air. Oh and the predicted daily usage character 31 (predicted temperature θh′ obtained by +1′) that was predicted based on the actually measured solar radiation amount A
Since the heating device 8 and the cooling device 9 are controlled while predicting the optimum temperature for the stagnation of photosynthesis, the indoor air temperature can be adjusted without time delay. Then, the CO2 supply device 10 is predicted based on the actually measured CO2 concentration cb and the actually measured amount of solar radiation, unlike the conventional configuration b, which directly controls the CozE degree by measuring the CO2 concentration before the current time. predicted CO2f
Since the structure is configured to control the amount of CO2 to increase the degree of A and Ck', CO2 is
The supply device 10 is now controlled, so that the CO
2 concentration can be adjusted without time delay.

In addition, taking into consideration that the rate of adjustment of indoor air temperature and CO2 concentration tends to increase as the internal volume of the plant growing room decreases, in this example, the measurement time interval is set to the content of the plant growing room. Since the settings are based on the product, optimal control can be performed depending on the internal volume of the plant growth chamber.

Furthermore, a translocation promotion time period is provided following the photosynthesis promotion time period, and the predicted cumulative solar radiation amount 3b is set during this translocation promotion time period.
Since the heating device 8 and the cooling device 9 are controlled while predicting +1'', the temperature of the indoor air can be adjusted without time delay to the optimum temperature for promoting the commutation effect, thereby greatly enhancing the commutation effect. I can do it.

In this embodiment, the heating device 8. Cooling device9. Although the fan device 11 is provided in order to speed up the diffusion of hot air, cold air, and CO2 gas discharged from the CO2 supply device 10, the present invention is not limited to this. The fan device 11 may not be provided if the internal volume of the plant growth chamber is small and the diffusion rate is not a big problem.

Further, in the present embodiment, the temperature control device δ is composed of the heating device 8 and the cooling device δ9, but is not limited to this, and may be composed of only the heating device 8.

[Effects of the Invention] As is clear from the above description, the temperature control device and CO2 supply device of the present invention are controlled while predicting the temperature and CO2 concentration that are optimal for promoting photosynthesis. It has the excellent effect of being able to adjust the CO2 concentration with a time delay and constantly maintaining the environment in the plant growing room in an optimal state.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a block diagram, Fig. 2 is an electrical configuration diagram, Fig. 3 is a diagram showing temporal changes in solar radiation, and Fig. 4 is a predictive control diagram. The diagrams 5 to 8 showing the principle of this are flowcharts. In the drawing, 1 is a solar radiation measuring device, 2 is a temperature measuring device, and 3 is a CO2
8 is a heating device (temperature adjustment device), 9 is a cooling device (temperature adjustment device), and 10 is a CO2 supply device. QIOI+ to applicant Toshiba Corporation 17! l Kyodai 2nd Figure Haruma 30'P, 5 Figure 6 Figure % 7 Figure 8

Claims (1)

[Claims] 1. A temperature control device that changes the temperature of indoor air in a plant growing room, and a CO_2 supplying CO_2 into the plant growing room.
2 supply device, the temperature adjustment device is configured to be controlled based on the temperature in the plant growth chamber and a predicted temperature predicted based on the amount of solar radiation before the temperature measurement, Environmental control of a plant growing room, characterized in that the CO_2 supply device is configured to be controlled based on the CO_2 concentration in the plant growing room and a predicted CO_2 concentration predicted based on the amount of solar radiation before measuring the CO_2 concentration. Device. 2. The plant according to claim 1, wherein the temperature and CO_2 concentration in the plant growth chamber are measured intermittently, and the measurement time interval is set based on the internal volume of the plant growth chamber. Environmental control device for growth room