Automated control system cooling sprinkler irrigation of agricultural crops

 

(57) Abstract:

Usage: in agriculture, in the field of land reclamation of agricultural crops, the functioning of which is operative control parameters of the external environment. The inventive system introduced converters 6 - 10, blocks determine the duration of irrigation depending on humidity 18 and 19 soil, the sensor 1 to the intensity of the solar radiation sensor 2 surface air temperature sensor 3 soil moisture sensor 4 humidity surface air, the sensor 5 of the intensity of the wind, the last of which is connected with the corresponding Converter 10, the blocks determine the time of day 11, determine the duration of irrigation on temperature 13, soil moisture, air humidity 18, the delay unit 16, moreover, the yield of the latter is connected to the first input unit for determining the time of day 11, a second input connected to the inverter 6 of the intensity of solar radiation, the first output with the first input unit 14, the determination of the deviation of the soil moisture values from the set, the second output with the first input unit 12 to determine the optimal temperature. The invention improves the efficiency is accounting for the effects of wind, resulting in higher crop yields, reduce their production cost. 1 Il.

The present invention relates to systems for the irrigation of agricultural crops (stationary and mobile), the functioning of which is operative control parameters of the external environment.

Known control device of the sprinkler system with the use of ohmic probe [patent U.S. CL 307-116, N 3238392, 1966]

Known devices for controlling irrigation of agricultural crops closest in technical essence to the present invention is an automated install, designed for automatic monitoring and control of irrigation of agricultural crops. [Automated installation comprehensive assessment of agroclimatic factors "electronics AGRO-85" VDNH USSR. Pushchino, 1987]

The most significant disadvantages of the known device are as follows.

1. Significant water and energy costs.

2. Insufficient reliability.

3. Not take into account the influence of the wind.

The objective of the invention is to improve the efficiency and reliability of the device. As a result, is improving the productivity of agricultural crops, to reduce the cost of their production.

The above process results are achieved by the fact that it entered the fourth and fifth inverters and humidity sensor surface air and the intensity of the wind, which through the fourth and fifth inverters connected respectively to the fourth and the fifth, sixth and seventh inputs of the computing unit, and the latter includes blocks determine the optimal values of surface air temperature and time of day, the first inputs of which are respectively the first and second computing unit of block, blocks, comparing actual and preset values of soil moisture and surface air, the first inputs of which are the third and fourth outputs of the computing unit, the unit time delay the blocks determine the duration of irrigation depending on the temperature and humidity of the surface air and soil humidity, the first inputs and the outputs of which are respectively the fifth, sixth and seventh inputs and outputs of the computing unit, the second input and output unit determination period days respectively connected with the first output of unit time delay and the second inputs of the block relative to the layer of air, direct and inverted outputs of which are connected with the second inputs of the block defining the duration of irrigation depending on the values of surface air temperature and unit comparison of actual value and setpoint humidity surface air, and direct and inverted outputs of the latter is connected to the second inputs of the block defining the duration of irrigation depending on the humidity surface air and the unit time delay, and direct and inverted outputs of the block comparison of actual and set values of soil moisture are associated respectively with the second input of the block defining the duration of irrigation depending on the soil moisture values and the third input of the unit delay time, the fourth input of which is the eighth input of the computing unit and connected to the control output of the actuator.

The invention is illustrated in Fig. 1.

The device comprises a sensor 1, the intensity of the solar radiation sensor 2 surface air temperature sensor 3 soil moisture sensor 4 humidity surface air, the sensor 5 of the intensity of the wind, the converters 6 and 10, block 11 defining the time of day, block 12 defining opravnenia actual and set values of soil moisture, the actuator 15, the unit time delay 16, block 17 comparison of actual value and setpoint humidity, block 18 to determine the duration of irrigation depending on the value of the air humidity, the unit 19 determine the duration of irrigation depending on the magnitude of soil moisture.

Moreover, the outputs of the sensors, solar radiation 1, surface air temperature 2, soil moisture 3 and humidity surface air 4, the intensity of the wind 5 are connected to respective inputs of the converters 6 and 10, the input unit delay time 16 connected to the first input unit determining the time of day 11, a second input connected to the Converter intensity of solar radiation 6, the first input with the first input unit 14 comparison of actual and set values of soil moisture, the second output with the first input unit 12 to determine the optimal temperature, a second input connected to the output of the inverter 7, the surface air temperature, the NO output to the first input unit 17 comparison of actual value and setpoint humidity, and the output of YES to the first input of the block defining the duration of irrigation 13 depending on temperature, the second vhlogo mechanism 15, a second input connected to the output unit 18 to determine the duration of irrigation depending on the magnitude of soil moisture, the third input to an output unit 19 to determine the duration of irrigation depending on the magnitude of the humidity, and the output with the first input of the unit delay time 16, a second input connected to the output has NO unit 17 comparison of actual value and setpoint humidity, a second input connected to the Converter 9 humidity surface air, and the output of YES to the first input unit 18 definitions dlitelnosti irrigation depending on the magnitude of soil moisture, the second input of which is connected to the second inverter output 10 of the intensity of the wind, the third output of which is connected to the first input unit 19 determine the duration of irrigation depending on the magnitude of the humidity, a second input connected to the output YES of block 14 comparison of actual and set values of soil moisture, there is NO way out of which is connected to the third input of the unit delay time 16.

The device operates as follows. After the activation of the signal from the sensor 1 to the intensity of solar radiation through the Converter 6 is supplied to the block 11 defining the time of day. Unit 11 OPA signal block 11 defining period of the day begins to work the block 14 comparison of actual (Q) and the set (Q1) soil moisture values. If Q < Q1, where permissible deviation Q1, the unit 18 to determine the duration of irrigation depending on the magnitude of soil moisture includes the actuator 15 calculated on this unit.

After the operation of the actuator 15 is activated, the unit time delay 16. During the delay time "poll sensors 1 5 system does not. At the end of the delay time is once again working unit 11 determine the time of day. The duration of watering at night, the unit 19 determines according to the formula

< / BR>
where npthe number of nozzles,

q flow water spray, l/s,

tcfandcfthe average temperatureoC, and humidity, for a controlled period,

v is the wind speed in m/s

If soil moisture corresponds to a given (irrigation is not needed), the signal block 14 comparison of actual and set values of soil moisture include the unit time delay 16.

In the daytime signal block 11 defining time-of-day block 12 determine the optimal temperature calculates the value of the optimal temperature (Topt), and compares it with the actual (coming from the sensor 2 temperature Converter the activity of irrigation depending on a temperature value that includes the calculated time, the actuator 15

< / BR>
where Q is the total water consumption, l,

S leaf surface, sq. m/ha,

t0resistive temperatureoC at night,

tinthe actual temperature value,oC,

Efand Etnactual and saturated values of pathobiochemistry, W/sq. m,

m, n are coefficients that determine the number of degrees that you want to increase the air temperature to ensure the best use of the energy of radiation on photosynthesis,oSLE.m/W,

in,optactual and optimal humidity,

century usp.usthe density of saturated water vapor at temperatures of air and plant, g/CC,

b width of the sheet, see

After the operation of the actuator 15 includes the delay unit 16, and then after the time delay, the system determines the time of day. If tintopt+ included in the operation unit 17 to determine the deviation of the actual humidity from the target value (vC). IfinC+ where permissible deviation humidity, block 18 determine the duration of irrigation humidity.

< / BR>
where opt.usdensity of saturated parsania, sq m

Then the time tCfulfills the actuator 15 includes the delay unit 16, etc.

Automated control system cooling sprinkler irrigation of agricultural crops containing the sensor surface air temperature, intensity of solar radiation and soil moisture, which through the first, second and third transducers associated with the first three inputs of the computing unit outputs connected to the control input of the actuator, characterized in that it introduced the fourth and fifth transducers and sensors humidity surface air and the intensity of the wind, which through the fourth and fifth inverters connected respectively to the fourth and the fifth, sixth and seventh inputs of the computing unit, and the latter includes blocks determine the optimal values of surface air temperature and the time of day, the first inputs of which are respectively the first and second inputs of the computing unit, the units of comparison of actual and set values of soil moisture and surface air, the first inputs of which are the third and fourth inputs of the computing unit, the unit vremennogo layer of air and soil humidity, the outputs are respectively the fifth, sixth and seventh inputs and outputs of the computing unit, the second input and output unit determination period days respectively connected with the first output of unit time delay and the second input unit of the comparing actual and set values of soil moisture and block determine the optimal values of surface air, direct and inverted outputs of which are connected with the second inputs of the block defining the duration of irrigation depending on the values of surface air temperature and unit comparison of actual value and setpoint humidity surface air, and direct and inverted outputs of the latter is connected to the second inputs of the block defining the duration of irrigation depending on the humidity surface air and the unit time delay, and direct and inverted outputs of the block comparison of actual and set values of soil moisture are connected respectively to the second input of the block defining the duration of irrigation depending on the soil moisture values and the third input of the unit time delay, the fourth input of which is the eighth input of the computing unit and connected to driving the

 

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