CN108181957B - Greenhouse roller shutter based on solar altitude angle and fuzzy control method thereof - Google Patents
Greenhouse roller shutter based on solar altitude angle and fuzzy control method thereof Download PDFInfo
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- CN108181957B CN108181957B CN201810000939.6A CN201810000939A CN108181957B CN 108181957 B CN108181957 B CN 108181957B CN 201810000939 A CN201810000939 A CN 201810000939A CN 108181957 B CN108181957 B CN 108181957B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- 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
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/22—Shades or blinds for greenhouses, or the like
- A01G9/227—Shades or blinds for greenhouses, or the like rolled up during non-use
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
Abstract
The invention provides a greenhouse roller shutter based on a solar altitude angle and a fuzzy control method thereof, and belongs to the technical field of agricultural automation. The rolling screen takes temperature, illumination and time as control signals, and the rolling screen part is selected to be rolled up or put down through the four rolling devices, so that the growth of crops in the greenhouse is facilitated.
Description
Technical Field
The invention belongs to the technical field of agricultural automation, and particularly relates to a greenhouse roller shutter based on a solar altitude angle and a fuzzy control method thereof.
Background
The sunlight greenhouse is a vegetable cultivation facility developed in northern areas of China in 80 years, has the advantages of a plastic greenhouse and a heating greenhouse, can produce fruits and vegetables through winter in the northern areas under the condition of no heating or little heating, and has good economic benefit. With the improvement of the living standard of urban and rural people, the solar greenhouse for cultivating fresh vegetables and fresh fruits in winter is rapidly developed, and the scale is rapidly increased. But also can obtain greater benefit for planting out-of-season vegetables and fruits and promote the development of the greenhouse. The rolling machine is an important component of the greenhouse, and the electric rolling machine is used, so that the illumination time is prolonged, the photosynthesis is increased, more importantly, the labor time is saved, and the labor intensity is reduced. According to investigation, in the production process of the sunlight greenhouse in the deep winter, the manual curtain control of the greenhouse needs about 1.5 hours every 667 square meters, the curtain rolling machine only needs about 8 minutes, and the manual curtain release needs about 1 hour before the sun falls off, so that the time of nearly 2 hours is saved compared with the manual curtain release by the curtain rolling machine every day. Meanwhile, the indoor precious illumination time is prolonged, and the photosynthesis time is prolonged. In addition, the electric roller shutter machine has good protection on the straw curtain, prolongs the service life of the straw curtain and greatly enhances the wind resistance. The utility model can be used by farmers easily, save time for crop management, improve quality and enlarge scale.
At present, domestic electric roller shutters mainly have the following two types: the fixed electric roller shutter machine is fixed at the top of the greenhouse, and the roller pipe rolls up and down and is suitable for rolling straw curtains and cotton curtains. But the lower part is driven by gravity, so that the rope is easy to be disorderly to influence the work under the condition of strong wind; the walking electric rolling shutter machine consists of cantilever rod, motor, speed reducing mechanism and rolling shutter shaft. The working mode adopts the manipulator principle and is not limited by the gradient of the greenhouse. But the stability of the cantilever rods and the support rods is poor, so that the greenhouse with large length is not suitable to be met. Both of these roller shutters rely on either manual proximity control or remote control. Manual control is not scientific and does not completely liberate production labor. If the timing control frees the labor force, but greatly reduces the illumination time of crops, the condition of crop frostbite is easy to occur. Aiming at the design problem of a control system of a roller shutter machine, many researchers design the roller shutter machine with a timing switch and a remote switch nowadays, and also consider the temperature factor. However, crop growth mainly depends on photosynthesis, light is a necessary consideration in addition to temperature, and if the light and other factors are not considered, optimal control cannot be achieved. In addition, the fully-opened state of the curtain rolling machine is kept in the time period when the light is weak in the early morning and evening, which is not beneficial to the temperature maintenance of the greenhouse. In the case of guaranteed light, crops may be frostbitten.
The roller blind machine lacks a reasonable automatic control system, and the problem is urgently solved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a greenhouse roller shutter fuzzy control system based on a solar altitude angle.
In order to achieve the above purpose, the invention provides the following technical scheme:
a greenhouse roller shutter fuzzy control system based on a solar altitude angle comprises a fixed frame, a first winding device, a second winding device, a third winding device, a fourth winding device, a control module and a plurality of roller shutter bodies;
the number of the fixing frames is at least two, the two fixing frames are matched with the outer wall of the greenhouse, and the two fixing frames are respectively arranged on the outer walls at two ends of the greenhouse;
the first winding device, the second winding device, the third winding device and the fourth winding device are respectively and symmetrically arranged relative to the length direction of the greenhouse; the first winding device is arranged at one end of the top of the greenhouse, and the third winding device is arranged between the first winding device and the ground on one side of the greenhouse;
each winding device comprises a motor, a speed reducer and a roller shutter shaft, the motor and the speed reducer are fixed on the fixing frame on one side, the motor is located below the speed reducer, an output shaft of the motor is connected with an output shaft of the speed reducer through a transmission belt, one end of the roller shutter shaft is fixedly connected with the output shaft of the speed reducer, the other end of the roller shutter shaft is rotatably connected with the fixing frame on the other side, and the upper end of the roller shutter body is fixed on the roller shutter shaft;
the control module comprises a temperature sensor, an illumination sensor, a data processing module, a main controller and a fuzzy controller, the data processing module, the main controller and the fuzzy controller are all arranged in the greenhouse, the temperature sensor and the illumination sensor are all arranged at the top of the greenhouse, the temperature sensor and the illumination sensor are all connected with a signal input end of the main controller, and the motor is connected with a signal output end of the main controller;
the temperature sensor is used for acquiring temperature signal initial data outside the greenhouse and sending the temperature signal initial data to the data processing module;
the illumination sensor is used for acquiring illumination signal initial data outside the greenhouse and sending the illumination signal initial data to the data processing module; the illumination signal comprises an illumination intensity signal and a sunlight illumination angle signal;
the data processing module receives the initial data of the temperature signal and the initial data of the illumination signal, processes the initial data to obtain fuzzy input quantity, and sends the fuzzy input quantity to the fuzzy controller;
the fuzzy controller receives the fuzzy input quantity and queries a fuzzy control rule table to obtain an accurate output quantity;
and the main controller receives the accurate output quantity and sends a control instruction to the motor according to the accurate output quantity.
Preferably, follow the roll screen shaft evenly is provided with two at least fixing bases, the fixing base is fixed on the greenhouse skeleton, the roll screen shaft passes the fixing base.
Preferably, the controller is an AT89C82 singlechip.
The invention also aims to provide a fuzzy control method of the greenhouse roller shutter based on the solar altitude angle, which comprises the following steps:
step 1: selecting a membership function, setting a fuzzy control rule table, and setting a roller shutter opening or closing threshold according to a temperature signal, an illumination signal and a time signal;
step 2: the temperature sensor collects temperature signal initial data outside the greenhouse and sends the temperature signal initial data to the data processing module;
the illumination sensor collects initial data of illumination signals outside the greenhouse and sends the initial data of the illumination signals to the data processing module; the illumination signal comprises an illumination intensity signal and a sunlight illumination angle signal;
the method comprises the following steps: 3: the data processing module receives the initial data of the temperature signal and the initial data of the illumination signal, processes the initial data to obtain fuzzy input quantity, and sends the fuzzy input quantity to the fuzzy controller;
and 4, step 4: the fuzzy controller receives fuzzy input quantity and queries a fuzzy control rule table to obtain accurate output quantity;
and 5: and the main controller receives the accurate output quantity and sends a control instruction to the motor according to the accurate output quantity.
Preferably, membership functions of the temperature signal, the illumination signal and the time signal are all Gaussian, and three fuzzy sets are established by inputting the illumination signal, wherein the fuzzy sets are low illumination ll, medium illumination ml and high illumination hl respectively;
establishing three fuzzy sets of temperature signal input, namely a low temperature lt, a medium temperature mt and a high temperature ht;
the time interval is 0-24 hours, five fuzzy sets are established by time signal input, and from sunrise, the time is 1time in the morning, 2time in the morning, 3time in the noon, 4time in the afternoon and 5time in the dusk;
the control instruction output adopts a triangular membership function, the opening mode of the rolling machine is 7 output conditions, namely 1open, 2open, 3open, 4open, 5open, 6open and 7open, and the output interval is 0-8.
The invention provides a greenhouse roller shutter based on solar altitude angle, a fuzzy control system and a method thereof
Has the advantages that:
(1) the sunlight greenhouse curtain rolling machine control system is based on three inputs of temperature, illumination and time of the fuzzy control system.
(2) Besides temperature control, illumination intensity and sunlight illumination angle control are added, the sunlight illumination angle is determined according to local longitude and time by combining an illumination sensor, and the rolling machine is switched on and off in different sections according to the incident angle of sunlight. Under the condition of ensuring illumination, the heat loss of the greenhouse is reduced, the working efficiency of the curtain rolling machine is improved, and the time is saved.
(3) And real-time control is realized by a computer by using a fuzzy controller. According to the deviation and the magnitude of the deviation change value, the electric output is determined by utilizing a fuzzy control rule, so that a good control effect is obtained, and the temperature can be monitored in real time;
(4) compared with the control effect of a common PID controller, the system response overshoot is small and the response curve is stable after the fuzzy controller is adopted; the system has good response speed, stability and accuracy, and has stronger robustness; the three parameters determined by the fuzzy control rule are dynamically changed, and are more in line with the control characteristics of the air conditioning system; the fuzzy controller can overcome the limitation of a common PID controller and has wide application value in automatic control of temperature and the like.
(5) The control module of the roller shutter machine basically realizes full-automatic control except sudden severe temperature change, has high and scientific control effect and basically liberates labor force. The scientific control system increases the illumination time of crops, ensures the temperature of a greenhouse, improves the crop yield and directly brings huge economic benefits for agricultural production.
Drawings
FIG. 1 is a schematic structural view of a greenhouse roller blind based on solar altitude in embodiment 1 of the present invention;
FIG. 2 is a block diagram of a fuzzy control system for greenhouse roller blinds based on solar altitude in embodiment 1 of the present invention;
FIG. 3 is a schematic diagram showing seven open states of a greenhouse roller shutter based on solar altitude in embodiment 1 of the present invention;
FIG. 4 is a flowchart of a fuzzy control method for greenhouse roller blinds based on solar altitude according to embodiment 1 of the present invention;
FIG. 5 is a graph showing the variation of illumination input in matlab according to embodiment 1 of the present invention;
FIG. 6 is a graph showing the temperature input variation in matlab of example 1 according to the present invention;
FIG. 7 is a graph showing the variation of time input in matlab according to embodiment 1 of the present invention;
FIG. 8 is a graph showing the output variation in matlab according to embodiment 1 of the present invention;
FIG. 9 is a simlink simulation model according to embodiment 1 of the present invention;
FIG. 10 is a temperature input simulation curve for simlink in example 1 of the present invention;
FIG. 11 is a simulation curve of illumination input in simlink according to embodiment 1 of the present invention;
FIG. 12 is a time input simulation curve for simlink in example 1 of the present invention;
FIG. 13 is a simulation curve of the output of simlink in embodiment 1 of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing technical solutions of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. In the description of the present invention, unless otherwise specified, "a plurality" means two or more, and will not be described in detail herein.
Example 1
The invention provides a greenhouse roller shutter fuzzy control system based on a solar altitude angle, which is particularly shown in a figure 1 and a figure 2 and comprises a fixed frame 1, a first winding device, a second winding device, a third winding device, a fourth winding device, a control module and a plurality of roller shutter bodies 2;
the mount 1 is two at least, and two mounts 1 match with 3 outer walls in greenhouse, and two mounts 1 set up respectively on the outer wall at 3 both ends in greenhouse. When the greenhouse is longer, the quantity of the fixing frames 1 can be increased, and the fixing frames 1 are uniformly arranged on the outer wall of the greenhouse 3. The both ends of mount 1 are fixed respectively on the subaerial of corresponding position, and mount 1 body equals the skeleton fixed connection of greenhouse 3 through the screw.
The first winding device, the second winding device, the third winding device and the fourth winding device are respectively and symmetrically arranged relative to the length direction of the greenhouse 3; the first winding device is arranged at one end of the top of the greenhouse 3, and the third winding device is arranged between the first winding device and the ground at one side of the greenhouse 3. The purpose of the arrangement is to divide the whole roller shutter into four parts, and the rolling up or the laying down of each part of roller shutter can be judged according to the illumination intensity and the temperature in the greenhouse, so that the effective light can be fully and reasonably utilized, the illumination time of crops can be prolonged, and the growth of the crops can be promoted.
Every take-up device all includes motor 4, speed reducer 5 and roll up curtain axle 6, and motor 4 and speed reducer 5 are all fixed on one side mount 1, and motor 4 is located speed reducer 5 below, and motor 4's output shaft passes through drive belt 7 with speed reducer 5's output shaft to be connected, and 6 one end of roll up curtain axle and speed reducer 5's output shaft fixed connection, the roll up curtain axle 6 other end and the rotation of opposite side mount 1 are connected, and 2 upper ends of roll up curtain body are fixed on roll up curtain axle 6. When the rolling shutter is used, the motor 4 rotates forwards or backwards, the speed reducer 5 is driven to rotate through the transmission belt 7, and the speed reducer 5 further drives the rolling shutter shaft 6 to rotate forwards or backwards, so that rolling up or putting down of the rolling shutter is realized.
The control module in this embodiment includes a temperature sensor 10, an illumination sensor 9, a data processing module, a main controller and a fuzzy controller, and the controller in this embodiment is an AT89C82 single chip microcomputer. The data processing module, the main controller and the fuzzy controller are all arranged in the greenhouse 3, the temperature sensor 10 and the illumination sensor 9 are all arranged at the top of the greenhouse 3, the temperature sensor 10 and the illumination sensor 9 are both connected with the signal input end of the main controller, and the motor 4 is connected with the signal output end of the main controller;
the temperature sensor 10 is used for acquiring initial data of temperature signals outside the greenhouse 3 and sending the initial data of the temperature signals to the data processing module;
the illumination sensor 9 is used for collecting initial data of illumination signals outside the greenhouse 3 and sending the initial data of the illumination signals to the data processing module; the illumination signal comprises an illumination intensity signal and a sunlight illumination angle signal;
the data processing module is used for receiving the initial data of the temperature signal and the initial data of the illumination signal, processing the initial data to obtain fuzzy input quantity and sending the fuzzy input quantity to the fuzzy controller;
the fuzzy controller receives the fuzzy input quantity and queries a fuzzy control rule table to obtain an accurate output quantity;
and the main controller receives the accurate output quantity and sends a control instruction to the motor 4 according to the accurate output quantity.
In order to improve the stability of rolling up the curtain, evenly be provided with two at least fixing bases 8 along rolling up curtain axle 6, fixing base 8 is fixed on greenhouse 3 skeleton, and rolling up curtain axle 6 passes fixing base 8.
As shown in fig. 3, the greenhouse roller blind provided in this embodiment provides seven open states, red in the figure is the open portion, which covers different directions and consideration of the illumination intensity.
Another object of the present embodiment is to provide a fuzzy control method for a rolling shutter of a greenhouse based on a solar altitude, as shown in fig. 4, comprising the following steps:
step 1: selecting a membership function, setting a fuzzy control rule table, and setting a roller shutter opening or closing threshold according to a temperature signal, an illumination signal and a time signal;
step 2: the temperature sensor 10 collects temperature signal initial data outside the greenhouse 3 and sends the temperature signal initial data to the data processing module;
the illumination sensor 9 collects initial data of illumination signals outside the greenhouse 3 and sends the initial data of the illumination signals to the data processing module; the illumination signal comprises an illumination intensity signal and a sunlight illumination angle signal;
the method comprises the following steps: 3: the data processing module receives the initial data of the temperature signal and the initial data of the illumination signal, processes the initial data to obtain fuzzy input quantity, and sends the fuzzy input quantity to the fuzzy controller;
and 4, step 4: the fuzzy controller receives the fuzzy input quantity and queries a fuzzy control rule table to obtain an accurate output quantity;
and 5: the main controller receives the accurate output quantity and sends a control instruction to the motor 4 according to the accurate output quantity.
Establishing a fuzzy control membership model in the matlab;
as shown in fig. 5, the first input illumination: in order to improve the control efficiency, the real illumination data is multiplied by 0.001 to be embodied in simlink simulation, and the membership function is in a Gaussian form. The illumination deviation interval is-10001 x to 700001x, which can basically cover the application range. Establishing three fuzzy sets of low light (ll), medium light (ml) and high light (hl) by inputting;
as shown in fig. 6, the second input temperature:
and adopting a Gaussian membership function, wherein the temperature deviation interval is-3-50 ℃. Inputting and establishing three fuzzy sets, namely a low temperature (1t), a medium temperature (mt) and a high temperature (ht);
as shown in fig. 7, the third input time:
and adopting Gaussian membership functions, wherein the time interval is 0-24 hours. The input establishes five fuzzy sets, starting from sunrise, in the early morning (1time), in the morning (2time), in the midday (3time), in the afternoon (4time), in the dusk (5time) and ending in the evening for a total of five time periods. These five time periods cover the states of different sun light irradiation angles.
As shown in fig. 8, outputs:
and adopting a triangular membership function, and according to the designed opening modes of the 7 roller shutters, corresponding to 7 output conditions, respectively 1open, 2open, 3open, 4open, 5open, 6open and 7 open. The output interval is 0-8;
the fuzzy control rule is as follows:
·1.If(sun is ll)and(temperature is mt)and(time is 1time)then(door is1open)(1)
·2.If(sun is ll)and(temperature is mt)and(time is 2time)then(door is2open)(1)
·3.If(sun is ll)and(temperature is mt)and(time is 3time)then(door is4open)(1)
·4.If(sun is ll)and(temperature is mt)and(time is 4time)then(door is6open)(1)
·5.If(sun is ll)and(temperature is mt)and(time is 5time)then(door is7open)(1)
·6.If(sun is ll)and(temperature is ht)and(time is 1time)then(door is2open)(1)
·7.If(sun is ll)and(temperature is ht)and(time is 2time)then(door is3open)(1)
·8.If(sun is ll)and(temperature is ht)and(time is 3time)then(door is4open)(1)
·9.If(sun is ll)and(temperature is ht)and(time is 4time)then(door is5open)(1)
·10.If(sun is ll)and(temperature is ht)and(time is 5time)then(dooris 6open)(1)
·11.If(sun is ml)and(temperature is lt)and(time is 1time)then(dooris 1open)(1)
·12.If(sun is ml)and(temperature is lt)and(time is 2time)then(dooris 2open)(1)
·13.If(sun is ml)and(temperature is lt)and(time is 3time)then(dooris 4open)(1)
·14.If(sun is ml)and(temperature is lt)and(time is 4time)then(dooris 6open)(1)
·15.If(sun is ml)and(temperature is lt)and(time is 5time)then(dooris7open)(1)
·16.If(sun is ml)and(temperature is mt)and(time is 1time)then(dooris 2open)(1)
·17.If(sun is m1)and(temperature is mt)and(time is 2time)then(dooris 3open)(1)
·18.If(sun is ml)and(temperature is mt)and(time is 3time)then(dooris 4open)(1)
·19.If(sun is ml)and(temperature is mt)and(time is 4time)then(dooris 5open)(1)
·20.If(sun is ml)and(temperature is mt)and(time is 5time)then(dooris 6open)(1)
·21.If(sun is ml)and(temperature is ht)and(time is 1time)then(dooris 2open)(1)
·22.If(sun is ml)and(temperature is ht)and(time is 2time)then(dooris 4open)(1)
·23.If(sun is ml)and(temperature is ht)and(time is 3time)then(dooris 4open)(1)
·24.If(sun is ml)and(temperature is ht)and(time is 4time)then(dooris 4open)(1)
·25.If(sun is ml)and(temperature is ht)and(time is 5time)then(dooris 6open)(1)
·26.If(sun is h1)and(temperature is lt)and(time is ltime)then(dooris 2open)(1)
·27.If(sun is hl)and(temperature is lt)and(time is 2time)then(dooris 3open)(1)
·28.If(sun is hl)and(temperature is lt)and(time is 3time)then(dooris 4open)(1)
·29.If(sun is hl)and(temperature is lt)and(time is 4time)then(dooris 5open)(1)
·30.If(sun is hl)and(temperature is lt)and(time is 5time)then(dooris 6open)(1)
·31.If(sun is hl)and(temperature is mt)and(time is 1time)then(dooris 2open)(1)
·32.If(sun is hl)and(temperature is mt)and(time is 2time)then(dooris 3open)(1)
·33.If(sun is hl)and(temperature is mt)and(time is 3time)then(dooris 4open)(1)
·34.If(sun is hl)and(temperature is mt)and(time is 4time)then(dooris 5open)(1)
·35.If(sun is hl)and(temperature is mt)and(time is 5time)then(dooris 6open)(1)
·36.If(sun is hl)and(temperature is ht)and(time is ltime)then(dooris 3open)(1)
·37.If(sun is h1)and(temperature is ht)and(time is 2time)then(dooris 4open)(1)
·38.If(sun is hl)and(temperature is ht)and(time is 3time)then(dooris 4open)(1)
·39.If(sun is hl)and(temperature is ht)and(time is 4time)then(dooris 4open)(1)
·40.If(sun is hl)and(temperature is ht)and(time is 5time)then(dooris 5open)(1)。
simulation models were built using simlink, as shown in fig. 9-13.
Simulation data, temperature and illumination change conditions of a certain sunlight greenhouse 2017, 1 month and 1 day. For a total of 266 recorded points, an average of 5.41 minutes (266 time points-5.41 minutes for 24 hours) was read. :
as can be seen from the figure, the output state of the rolling shutter machine is transited from one to seven along with the time, the bad value is basically avoided, and the output condition is basically reasonable. And in consideration of the switching time and the actual working requirement of the curtain rolling machine, the output condition is detected once per hour, and the state of the curtain rolling machine is updated. But the input detection of temperature and illumination is once for about 5 minutes so as to ensure the timeliness of control.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (5)
1. A greenhouse roller shutter based on a solar altitude angle is characterized by comprising a fixed frame (1), a first winding device, a second winding device, a third winding device, a fourth winding device, a control module and a plurality of roller shutter bodies (2);
the number of the fixing frames (1) is at least two, the two fixing frames (1) are matched with the outer wall of the greenhouse (3), and the two fixing frames (1) are respectively arranged on the outer walls at the two ends of the greenhouse (3);
the first winding device, the second winding device, the third winding device and the fourth winding device are respectively and symmetrically arranged relative to the length direction of the greenhouse (3); the first winding device is arranged at one end of the top of the greenhouse (3), and the third winding device is arranged between the first winding device and the ground on one side of the greenhouse (3);
each winding device comprises a motor (4), a speed reducer (5) and a rolling shutter shaft (6), the motor (4) and the speed reducer (5) are fixed on one side of the fixing frame (1), the motor (4) is located below the speed reducer (5), an output shaft of the motor (4) is connected with an output shaft of the speed reducer (5) through a transmission belt (7), one end of the rolling shutter shaft (6) is fixedly connected with an output shaft of the speed reducer (5), the other end of the rolling shutter shaft (6) is rotatably connected with the other side of the fixing frame (1), and the upper end of the rolling shutter body (2) is fixed on the rolling shutter shaft (6);
the control module comprises a temperature sensor (10), an illumination sensor (9), a data processing module, a main controller and a fuzzy controller, the data processing module, the main controller and the fuzzy controller are all arranged in the greenhouse (3), the temperature sensor (10) and the illumination sensor (9) are all arranged at the top of the greenhouse (3), the temperature sensor (10) and the illumination sensor (9) are both connected with a signal input end of the main controller, and the motor (4) is connected with a signal output end of the main controller;
the temperature sensor (10) is used for acquiring temperature signal initial data outside the greenhouse (3) and sending the temperature signal initial data to the data processing module;
the illumination sensor (9) is used for collecting initial data of illumination signals outside the greenhouse (3) and sending the initial data of the illumination signals to the data processing module; the illumination signal comprises an illumination intensity signal and a sunlight illumination angle signal;
the data processing module receives the initial data of the temperature signal and the initial data of the illumination signal, processes the initial data to obtain fuzzy input quantity, and sends the fuzzy input quantity to the fuzzy controller;
the fuzzy controller receives the fuzzy input quantity and queries a fuzzy control rule table to obtain an accurate output quantity;
and the main controller receives the accurate output quantity and sends a control instruction to the motor (4) according to the accurate output quantity.
2. Greenhouse roller shutter based on solar altitude angle, according to claim 1, characterized by that, there are at least two fixing bases (8) evenly arranged along the roller shutter shaft (6), the fixing bases (8) are fixed on the greenhouse (3) frame, the roller shutter shaft (6) passes through the fixing bases (8).
3. The greenhouse roller shutter based on solar altitude angle of claim 1, characterized in that the main controller is AT89C52 singlechip.
4. A fuzzy control method of greenhouse roller shutters based on solar altitude angles is characterized by comprising the following steps:
step 1: selecting a membership function, setting a fuzzy control rule table, and setting a roller shutter opening or closing threshold according to a temperature signal, an illumination signal and a time signal;
step 2: the temperature sensor (10) collects temperature signal initial data outside the greenhouse (3) and sends the temperature signal initial data to the data processing module;
the illumination sensor (9) collects initial data of illumination signals outside the greenhouse (3) and sends the initial data of the illumination signals to the data processing module; the illumination signal comprises an illumination intensity signal and a sunlight illumination angle signal;
and step 3: the data processing module receives the initial data of the temperature signal and the initial data of the illumination signal, processes the initial data to obtain fuzzy input quantity, and sends the fuzzy input quantity to the fuzzy controller;
and 4, step 4: the fuzzy controller receives fuzzy input quantity and queries a fuzzy control rule table to obtain accurate output quantity;
and 5: the main controller receives the accurate output quantity and sends a control instruction to the motor (4) according to the accurate output quantity.
5. The fuzzy control method for greenhouse roller shutters based on solar altitude angle as claimed in claim 4, wherein the membership functions of temperature signal, illumination signal and time signal are all Gaussian type, illumination signal input establishes three fuzzy sets of low illumination ll, medium illumination ml and high illumination hl;
establishing three fuzzy sets of temperature signal input, namely a low temperature lt, a medium temperature mt and a high temperature ht;
the time interval is 0-24 hours, five fuzzy sets are established by time signal input, and from sunrise, the time is 1time in the morning, 2time in the morning, 3time in the noon, 4time in the afternoon and 5time in the dusk;
the control instruction output adopts a triangular membership function, the opening mode of the rolling machine is 7 output conditions, namely 1open, 2open, 3open, 4open, 5open, 6open and 7open, and the output interval is 0-8.
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