CN205485655U - Warmhouse booth's intelligence control system - Google Patents

Abstract

The utility model relates to a warmhouse booth's intelligence control system belongs to agricultural product production technical field, relates to warmhouse booth's environmental factor control, the utility model discloses control system includes treater, button collection module, illumination intensity collection module and valve control module, treater built -in memory and parameter set up the module, preserve the CO2 saturation point of every kind of plant under different illumination intensity in the memory, and the treater reads the plant variety of button collection module input and the illumination intensity that illumination intensity collection module confirms, looks for the CO2 saturation point that corresponds in the memory, confirms the CO2 volume of discharging to turn into the CO2 volume of discharging on the valve of the opening time of valve, valve control module control CO2 air supply. The utility model discloses a plant to CO2's demand, gives appropriate replenishment under different light intensity, improve the photosynthetic rate of plant, improves economic benefits.

Description

A kind of intelligence control system of warmhouse booth

Technical field

This utility model belongs to Internet of Things applied technical field, and the envirment factor relating to warmhouse booth controls, and is specifically related to the intelligence control system of a kind of warmhouse booth.

Background technology

Along with updating of technology of facilities and breeding and cultivation technology, industrialized agriculture crop yield is greatly improved, but the yield that the disadvantageous growing environment factor makes agricultural crops actual has only played about the 24% of its productive potentialities, limit the raising of yield, such as, ambient temperature, air humidity and CO₂Concentration.

CO₂It is that crop carries out one of photosynthetic raw material, therefore, CO₂Concentration is the critically important envirment factor affecting plant growth.CO₂Fertilising can strengthen vegetable to biotic stress and the resistance of abiotic stress, changes mineral absorption and the distribution of vegetable crop, also affects the ultrastructure of vegetable crop simultaneously.Crop carries out photosynthesis can consume substantial amounts of CO₂If, indoor CO₂Can not get supplementing in time, CO₂Concentration can decline rapidly.In the case of stuffy, CO₂Concentration can be reduced to crop CO₂Below compensation point, even if in the case of ventilating, indoor CO₂Concentration is likely to less than outdoor CO₂Concentration.Therefore, too low CO₂Concentration has become the key constraints that protected crop is photosynthetic, constrains crop growth, reduces crop yield and quality.

At present in terms of Humidity Detection, humidity sensor generally uses cellular structure, due to its humidity-sensitive material adsorptivity to moisture, cause humidity sensor detection have time lag length, unstability and be difficult to the feature of maintaining, measure there is bigger error.

Although there being some places using CO₂, have received good result after the envirment factor control method such as humidity, but after a lot of place not yet uses or uses, poor effect, even some place in use have also appeared some problems, therefore to CO₂Fertilization effect is demoted to praise and is differed.Why there will be above-mentioned situation, main cause has the CO that China lacks low cost, safe, simple to operate, gas production is high, easily controllable₂Generation equipment and shortage enrich CO₂Rich water quality management measure rational to crop afterwards.

Summary of the invention

In order to overcome the deficiencies in the prior art, this utility model provides the intelligence control system of a kind of warmhouse booth, by considering the conditions such as floristics, growing stage, cultivation condition and other environmental factorss, selects suitable CO₂Enrich method, fertilising concentration and fertilization time.

The technical solution of the utility model is: the CO of a kind of warmhouse booth₂Fertilization control system, including preserving various plants CO under different illumination intensity in processor, key acquisition module, intensity of illumination acquisition module, valve control module and Temperature Humidity Sensor, described processor internal memory and parameter setting module, memorizer₂Saturation point, the data collected are exported to processor by Temperature Humidity Sensor, the intensity of illumination that the plant variety data of processor reading key acquisition module input and intensity of illumination acquisition module detect, searches the CO that in memorizer, this kind of plant is corresponding under a certain intensity of illumination₂Saturation point, confirms CO₂The amount of discharging, realizes CO by valve control module₂Release control.

Above-mentioned parameter arranges module and also includes that intensity of illumination acquisition module gathers the time point of intensity of illumination every day and arranges, concrete, in 3-4 middle of the month, sunrise detects intensity of illumination, late April to May after 1 hour, sunrise detects after half an hour, in November to February, sunrise detection in 2 hours.Plant variety, intensity of illumination and CO in memory₂Synopsis in, intensity of illumination is at 27W m^-2Time above, CO₂The amount of discharging is more than 0.Control system also includes fan control module and blower fan, and described blower fan is in booth internal bidirectional circulating arrangement, and its direction of rotation is internally formed circulating current for making booth.Concrete, 10 to 20 centimetres of blower fan height distance ground, form the 10-20 degree elevation angle with ground, the direction of rotation of blower fan hoists flowing from lower for making air-flow.Blower fan wind speed is located at 0.3～1.0m s^-1In the range of, the boundary layer resistance of plant leaf blade reduces, and stomatal conductance increases；The air exchanging rate of described blower fan is 10h^-1, namely every 6min blower fan start and stop are once.Above-mentioned electromagnetic valve one end and CO₂Source of the gas UNICOM, the other end connects airway, a diameter of 2cm of airway, and the other end is closed, at interval of 1 meter of aperture being provided with an a diameter of 2mm on described airway.Control system also includes CO₂Concentration detection module, CO₂Concentration detection module is discharging CO₂After gas fertilizer, detect CO in real time₂Concentration change, the CO inside and outside booth₂After concentration is consistent, to booth forced ventilation.When to booth forced ventilation, the blower fan one-way only operation in booth, its direction of rotation is internally formed one-way flow air-flow for making booth.CO₂The amount of discharging compare CO₂Saturation point low.

Described Temperature Humidity Sensor includes quasiconductor detector unit, two times transfer unit and signal processing unit, and quasiconductor detector unit includes two semiconductor gauge R_{ε 1}And R_{ε 2}, semiconductor gauge R_{ε 1}And R_{ε 2}Being located at radius is r₀Circular film on, circular film is located on U-shaped bearing, form one between diaphragm and U-shaped bearing and seal cavity, two semiconductor gauges are responded by output resistance under the pressure differential inside and outside diaphragm and Temperature Excitation effect, electrical response signal is converted to pulse width signal by two times transfer unit, and signal processing unit isolates temperature and external and internal pressure difference and relative humidity by data decoupler.Described semiconductor gauge R_{ε 1}It is arranged on home position, R_{ε 2}It is arranged on diaphragm 0.89r₀Circle on, the variable quantity of two resistance strain gages is identical, positive and negative on the contrary.

This utility model has a following good effect: by plant under different light intensity to CO₂Demand, give suitable supplementing, improve the photosynthetic rate of plant, increase economic efficiency.

Accompanying drawing explanation

Fig. 1 is the CO of this utility model detailed description of the invention₂Fertilization control system structure chart.

Fig. 2 is the wind turbine layout figure of this utility model detailed description of the invention.

Fig. 3 be detailed description of the invention of the present utility model Temperature Humidity Sensor in the scheme of installation of foil gauge.

Fig. 4 is the structural representation of the Temperature Humidity Sensor of detailed description of the invention of the present utility model.

Fig. 5 is the diagram of strains of the foil gauge of detailed description of the invention of the present utility model.

Fig. 6 is the Temperature Humidity Sensor operation principle structured flowchart of detailed description of the invention of the present utility model.

Fig. 7 is the signal flow block diagram of the Temperature Humidity Sensor of detailed description of the invention of the present utility model.

Fig. 8 is the pulse width signal change-over circuit figure of detailed description of the invention of the present utility model.

In figure, 1, U-shaped bearing, 2, aeroseal chamber, 3, diaphragm, 4, semiconductor gauge R_{ε 1}, 5, semiconductor gauge R_{ε 2}, 6, blower fan.

Detailed description of the invention

Below against accompanying drawing, by the description to embodiment, detailed description of the invention of the present utility model is such as mutual alignment and annexation, the effect of each several part and operation principle, the manufacturing process between the involved shape of each component, structure, each several part and operates with method etc., it is described in further detail, to help those skilled in the art that inventive concept of the present utility model, technical scheme are had more complete, accurate and deep understanding.

This utility model system includes processor, key acquisition module, intensity of illumination detection module, CO₂Concentration detection module, Temperature Humidity Sensor, fan control module and solenoid valve control module, include memorizer and parameter setting module in processor, key acquisition module inputs parameter, due to the CO of different plants for user₂Saturation point is different, therefore must input floristics by key acquisition module, additionally, due to seasonal shift, sunrise time, in change, also implies that plant carries out the photosynthetic time in change, user needs to arrange the acquisition time of intensity of illumination detection module, namely CO₂Discharge the time.By key acquisition module, user is manually entered type and CO every day of plant₂Discharge time point, in memory, pre-set every kind of plant CO under different intensities of illumination₂Saturation point, controller determines the CO needing to discharge by lookup table mode₂Volume, CO₂Volume be converted into the time of discharging, namely the ON time of electromagnetic valve.

Due to CO₂Density bigger than air, so CO₂Deposit to bottom booth, affect plant canopy CO internal with group₂Be uniformly distributed, thus impact enrich CO₂The effect that gas is fertile.Plant carries out photosynthesis and consumes substantial amounts of CO₂If wind speed is less, CO can be made₂Diffusion rate slow down, cause the internal CO of phytobiocoenose₂Can not get supplementing in time, thus reduce the photosynthetic rate of plant.Inside booth, increase Fan Equipment, be conducive to the air circulation improved within booth, make the CO in booth₂Being evenly distributed, meanwhile, the boundary layer resistance of plant leaf blade reduces, and stomatal conductance increases, and improves CO₂Transformation efficiency.

As in figure 2 it is shown, this utility model sets up multiple blower fan inside booth, forming circulating current, 10 to 20 centimetres of blower fan height distance ground, form the 10-20 degree elevation angle with ground in making booth, wind speed is located at 0.3～1.0m s^-1In the range of.Blower fan is located at the height that distance ground is certain, and have certain elevation angle with ground, blower negative pressure face is the side near ground, this highly can ensure that when blower fan operates, the suction surface air circulation of blower fan will not be hindered, if getting too close to ground, because air circulation is obstructed, bigger noise can be produced.The 10-20 degree elevation angle can be by the CO of deposition₂Hoist diffusion, it is ensured that plant canopy is to CO₂Demand.Wind speed is at 0.3～1.0m s^-1In the range of time, the boundary layer resistance of plant leaf blade reduces, and stomatal conductance increases, and enriches CO₂Effect increase.If wind speed is too high, the part holes of plant can be caused to close, stomatal conductance reduces, CO₂Transformation efficiency reduce.

Greenhouse air exchanging rate under ventilation state is at 10h^-1More than secondary, therefore, blower fan of the present utility model can be in the way of using batch operation, and the averagely every 6min of blower fan works once, depending on the duration of every task is because of the distance between blower fan, it is ensured that the air in whole greenhouse circulation, CO₂It is evenly distributed, then can shut down.

CO of the present utility model₂Source of the gas uses the CO of bottled liquid₂, the CO of bottled liquid₂Concentration is easily controlled, convenient and safe, by airway and aperture thereon by CO₂Being applied to uniformly in warmhouse booth, conduit is fixed on the top of booth, a diameter of 2cm of airway, one is connected with steel cylinder gas vent, a closing, makes a call to, at interval of 1 meter, the aperture that a diameter is about 2mm on airway.The gas vent of steel cylinder is by electromagnetic valve control.

Due to the Repiration in plant night, cause the CO in canopy₂Concentration raises, these CO₂Just can be as plant photosynthesis raw material in the daytime, the CO after sunrise 1-2 hour, in canopy₂Concentration is higher than extraneous concentration, may advantageously facilitate the photosynthesis of plant, it is not necessary to additionally apply CO₂Gas is fertile.This utility model control system is after sunrise 1-2 hour, further according to environmental factorss such as current intensity of sunshines, it is considered to CO₂Fertilising.At rainy weather, photosynthesis is not strong, is not suitable for applying gas fertile.

Concrete, in 3-4 middle of the month, sunrise detected CO after 1 hour₂Concentration, late April to May, after sunrise half an hour, detect CO₂Concentration, in November to February, sunrise 2 hours detection CO₂Concentration, because the temperature in winter is relatively low, intensity of sunshine is the most on the low side, and photosynthetic rate is relatively low, CO after general two hours₂Lowering of concentration to reduced levels.Summer temp is higher, needs to ventilate and lowers the temperature in booth, but even if being always maintained at ventilating, the CO within booth₂Concentration also will less than extraneous 5%-10%, summer booth CO₂Fertilising concentration unsuitable too high, maintain the CO being bordering on air₂Concentration level, has significant effect.Largely improve the Net Photosynthetic Rate of plant.By CO₂Concentration enriches outdoor horizontal, even if the air exchanging rate of booth is quickly, there will not be CO₂Spill into outdoor, now, enrich CO₂Utilization ratio be about 1.

The portable instrument for determining photosynthesis of TPS-2 is set in booth and measures CO₂Concentration, by the intensity of illumination in illumination intensity sensor measuring chamber, intensity of illumination can be to CO₂Compensation point and saturation point produce impact, by organizing Experimental comparison, 8.5 more, 27,61,129,265W m^-2Under light intensity, observe 300 to 1000umol mol respectively^-1CO₂Photosynthetic rate under concentration, finds 8.5W m^-2Under light intensity, increase CO₂Concentration to photosynthetic rate improve inconspicuous, 27W m^-2Under light intensity, photosynthetic rate is from 5umol m^-2·s^-1Increase to 10umol m^-2·s^-1, increase more obvious, 61,129,265W m^-2Under light intensity, photosynthetic rate becomes apparent from, and therefore, this utility model selects 27W m^-2As reference value, at 27W m^-2More than light intensity, it is considered to apply CO to plant₂Gas is fertile.

Different floristics is to CO₂Absorption efficiency the most different, C3 plant is to CO₂Absorption efficiency with CO₂Concentration, the factor such as light intensity impact variation relatively big, but C4 plant is in the case of other conditions meet, 330umol mol^-1Time, photosynthetic rate is not further added by, and the CO of outdoor₂Concentration can meet this requirement substantially.

During actual use, CO will be set₂The amount of discharging lower than actual saturation point, because CO₂Absorption also affected by other envirment factors, but this is a complicated process being in dynamically change, is difficult to determine a definite value, therefore, by CO₂Saturation point arrange ratio actual value low, it is ensured that CO₂Concentration is not over saturation point, it is to avoid excessive CO₂Concentration, unfavorable to plant growing, also waste CO₂Source of the gas.

Discharged CO₂After gas, booth closes, and plant carries out photosynthesis, carries out along with photosynthetic, indoor CO₂Concentration starts to reduce, CO₂Concentration detection module monitors CO in real time₂Concentration, when dropping to external environment level, warmhouse booth, forced ventilation can be opened, make the Gas scavenging in booth.At this moment, the side blower fan in Fig. 2 can be closed, make gas circulate in the same direction as.Fan control module, for controlling the gas circulation in greenhouse, sets the opening time interval of blower fan and each working time.

The Temperature Humidity Sensor that this utility model provides uses analytic method to isolate corresponding transition response from multiple motivator, devise a kind of Temperature Humidity Sensor being made up of flexible sheet and U-shaped bearing, form a dry air annular seal space between flexible sheet and U-shaped bearing, be respectively configured with a semiconductor gauge in the center of circle of diaphragm appearance and the correct position by periphery.The multiple excitation information in air is received with this device, then after quadratic transformation and signal processing, so that it may obtain temperature, the data message such as relative humidity and atmospheric pressure.This device does not has the time lag length of traditional dew cell, unstability and is difficult to the problem of maintaining, can keep conversion accuracy and long-time stability, and be easy to safeguard in adverse circumstances.Only use strain resistor sensor is to change multiple atmospheric condition parameter, compared to traditional Temperature Humidity Sensor, it is achieved that single sensitive structure has the method for designing of multiple translation function for Temperature Humidity Sensor of the present utility model.

Described Temperature Humidity Sensor includes quasiconductor detector unit, two times transfer unit and signal processing unit, is provided with two semiconductor gauge R in quasiconductor detector unit_{ε 1}And R_{ε 2}Being arranged on radius is r₀Circular film on, semiconductor gauge is responded by the piezoresistance output resistance that changes, two times transfer unit receives the output signal of quasiconductor detector unit, electrical response signal is converted to pulse width signal, the output signal of signal processing unit Decoupling Analysis two times transfer unit, isolates temperature, relative humidity and atmospheric pressure data.

In described quasiconductor detector unit, two semiconductor gauge respective resistance delta numerical value produced under air pressure encourages are identical, and positive and negative one of them semiconductor gauge is arranged on home position on the contrary, and another semiconductor gauge is arranged on radius 0.89r₀Concentrically ringed position on.Described two times transfer unit includes two identical pulse signal change-over circuits, one semiconductor gauge correspondence connects a pulse signal change-over circuit, pulse signal change-over circuit includes 555 intervalometers, resistance R and electric capacity C, resistance R is connected between No. 2 pins of 555 intervalometers and No. 3 pins, electric capacity C is connected on No. 2 pins of 555 intervalometers, No. 2 pins and No. 6 pin short circuits, No. 3 pins and No. 7 pin short circuits, No. 7 pin output pulse widths of 555 intervalometers are signally attached to signal processing unit.The pulse width conversion formula of described pulse signal change-over circuit is τ=ln2 C R, and in formula, τ is output pulse width, and R is the resistance in circuit, and C is mica standard electric capacity, and pulsewidth output τ is directly proportional to respective institute connecting resistance R.Described circular film is divided into normal strain section and negative strain section according to the strain variation of two semiconductor gauges in quasiconductor detector unit, with radius 0.63r₀Concentric circular be boundary.Being provided with GPS unit and atmospheric pressure numerical tabular in described signal processing unit, GPS unit is connected on signal processing unit the longitude and latitude for alignment sensor mount point, the atmospheric pressure numerical value of inquiry mount point.Being provided with filament saturation water vapor partial pressure table in described signal processing unit, signal processing unit utilizes temperature to call corresponding saturation vapour partial pressure value.Described Temperature Humidity Sensor is arranged on the U-shaped bearing 1 of cylinder, circular film 3 is arranged on the upper surface of U-shaped bearing 1, circular film 3 selects pyrite diaphragm, is provided with aeroseal chamber 2 between U-shaped bearing 1 and pyrite diaphragm, and two semiconductor gauges are arranged on the surface of pyrite diaphragm.

Described signal processing unit utilizes steam partial pressure and the difference of sensitive resistance in air, pulsewidth after quadratic transformation and the difference of the counting of frequency all the time is directly proportional, atmospheric temperature is monodrome respective function relation with the counting sum of sensing element, calculates differential pressure value suffered by foil gauge, steam partial pressure value and temperature value.Described signal processing unit utilizes filament saturation water vapor partial pressure table, utilizes temperature value to call corresponding saturation vapour partial pressure value, calculates relative humidity according to the formula of relative humidity.

The concrete detection method of Temperature Humidity Sensor detection module of the present utility model is as follows: sensor circuit is installed in step one, connection；Step 2, adjust two semiconductor gauges installation site, the resistance delta making two semiconductor gauges be produced by air pressure incentive action is equal, positive and negative on the contrary；Step 3, the resistance change of semiconductor gauge are input to two times transfer unit and carry out pulse width conversion, output pulse width signal；Step 4, signal processing unit receive the pulse width signal of two times transfer unit output, utilize Dalton's law, foil gauge principle and analytic method to analyze the variable quantity of semiconductor gauge, temperature and steam partial pressure data, calculate relative humidity and the atmospheric value of tested point.

Described signal processing unit utilizes steam partial pressure and the difference of sensitive resistance semiconductor gauge in air, pulsewidth after quadratic transformation and the difference of the counting of frequency all the time is directly proportional, the logarithm of the counting sum of atmospheric temperature and sensitive resistance inversely, calculates differential pressure value Δ P, steam partial pressure P suffered by foil gauge_WWith temperature value t.Described signal processing unit utilizes filament saturation water vapor partial pressure table, calls corresponding saturation vapour partial pressure value according to temperature value, according to the formula of relative humidityCalculate relative humidity, in formulaFor relative humidity, P_WSFor saturation vapour partial pressure at a certain temperature in atmospheric pressure.Hereafter by the derivation of equation in detail Temperature Humidity Sensor of the present utility model detection temperature, humidity and the process of atmospheric pressure value are described in detail.

One, atmospheric condition parameter

Dalton's law is pointed out, the gross pressure of hybrid atmospheric is equal to the partial pressure sum of each composition gas, as shown in formula (1):

P_M=P_d+P_W(Pa) (1)

P in formula_M(Pa) it is the gross pressure of mixed gas, P_d(Pa) it is the partial pressure of dry atmosphere, P_W(Pa) it is contained steam partial pressure, wherein P in air_WAt P_MAccount for lion's share, be about 5%, therefore P_MAnd P_dPressure the most relatively normal atmosphere.

Relative humidity(RH%) formula is:

In formulaRepresent relative humidity, P_WSFor atmospheric pressure at a certain temperature, saturation vapour partial pressure (Pa), it becomes with temperature, can be tabled look-up by known temperature or tried to achieve by regression fit curvilinear equation.Can be obtained by formula (1), if differential pressure P can be measured by instrument_M-P_d, P can be calculated_W, then with measured temperature, in density of moist air, water vapour pressure, water capacity synopsis, find P_WS, just can be calculated relative humidity by formula (2)(RH%).

Two, foil gauge and transfer characteristic thereof

In sensor foil gauge scheme of installation as it is shown on figure 3, the structural representation of sensor as shown in Figure 4, the transfer characteristic of foil gauge and stress distribution are as shown in Figure 5.Temperature Humidity Sensor is cylindrical-shaped structure, shell includes U-shaped bearing 1 and circular film 3, circular film 3 covers on U-shaped bearing 1, therebetween an aeroseal chamber 3 is formed, two semiconductor gauges are arranged on circular film 3, calculate the temperature in Temperature Humidity Sensor installation environment, relative humidity and atmospheric pressure data by the resistance variations measuring semiconductor gauge.

Hybrid atmospheric pressure P_MStepless action is in the outer surface of flexible sheet, and then the differential pressure of diaphragm both sides is:

Δ P=P_M–P_re=P_W+P_d–P_re(Pa) (3)

P in formula_re=4 10⁴(Pa) being the reference pressure set in annular seal space, normal atmosphere value is P_d=101325 (Pa), thus water vapor partial pressure power P in air can be calculated_W(Pa)。

Under differential pressure Δ P effect, the distribution of membrane surface upper stress and strain is shown below:

Radial stress:

Radial strain:

In formula (4) and (5), this utility model selects elastic preferably pyrite diaphragm, and E (Pa) is membrane flexive modulus, about 7*10¹⁰Pa, μ are Poisson's ratio, about 0.33, r₀Outer radius 40 (mm) for circular film 3, h is the diaphragm thickness 0.1 (mm) of circular film 3, b is the thickness 5 (mm) of U-shaped bearing 1, the height of U-shaped bearing 1 is 10 (mm), Δ P is the differential pressure (Pa) acting on diaphragm both sides, and r (mm) is the radius of foil gauge position.

If known constant is substituted into (4) formula, circumferential stress σ can be obtained_{r = 0}=8*10⁴*ΔP(Pa) (6)。

The sensitivity coefficient K of foil gauge_εWith transfer characteristic such as formula (7) Suo Shi:

$\frac{{\mathrm{\ΔR}}_{\mathrm{\ϵ}}}{R_0}=K_{\mathrm{\ϵ}}*\mathrm{\ϵ}---\left(7\right)$

R in formula₀For t=0 DEG C and ε_rFoil gauge resistance (Ω), K when=0_εIt is about 125, Δ R_εIt is then that foil gauge is at ε_rThe variable quantity (Ω) of the lower resistance of excitation, can obtain (6) formula substitution (7):

$\frac{{\mathrm{\ΔR}}_{\mathrm{\ϵ}}}{R_0}={10}^7*\frac{\mathrm{\Δ}P}{E}---\left(8\right)$

If by E=7*10¹⁰Pa substitutes into formula and understands, the relative resistance change that foil gauge can be output by, and also only has 10 under maximum range^-2Magnitude, therefore quadratic transformation and signal processing circuit need to be added in a device, the sensitivity needed for obtaining and resolving power.

Three, quadratic transformation and signal transmit flow process

Operation principle structured flowchart is as shown in Figure 6, Temperature Humidity Sensor includes quasiconductor detector unit, two times transfer unit, signal processing unit, quasiconductor detector unit is provided with two semiconductor gauges, semiconductor gauge is responded by the piezoresistance output resistance that changes, the outfan connecting secondary converting unit of quasiconductor detector unit, two times transfer unit receives the output signal of quasiconductor detector unit, electrical response signal is converted to pulse width signal by two times transfer unit, the outfan of two times transfer unit connects signal processing unit, the output signal of signal processing unit Decoupling Analysis two times transfer unit.

Signal flow block diagram is as shown in Figure 7, two times transfer unit includes two identical pulse signal change-over circuits, pulse signal change-over circuit is made up of 555 intervalometer C1 and C2, two times transfer unit and signal processing unit are additionally provided with gating switch, selecting C3 switch, signal processing unit mainly comprises as C4 single-chip microcomputer.R in Fig. 7_{ε 1}And R_{ε 2}At P_WUnder encouraging with t, each produce different R₁And R₂Response, they, after C1, C2 chip 555 of two identical pulse signal change-over circuits converts, each produce τ₁And τ₂(S) pulsewidth output, this pulse width signal is delivered to C4 single-chip microcomputer after C3 switching gate again and is carried out signal processing.Pulse signal change-over circuit is as shown in Figure 8, resistance R is connected between No. 2 pins of C intervalometer 555 and No. 3 pins, electric capacity C is connected on No. 2 pins of 555 intervalometers, No. 2 pins and No. 6 pin short circuits, No. 3 pins and No. 7 pin short circuits, No. 7 pin output pulse widths of 555 intervalometers are signally attached to signal processing unit.Due to the difference of foil gauge, resistance and output pulse width in two impulse circuits can use R₁And R₂、τ₁And τ₂Represent.

Pulse width conversion formula: τ=ln2 C R (S) corresponds to two pulse signal change-over circuits and is:

τ₁=ln2 C₀·R₁(S) (9)

τ₂=ln2 C₀·R₂(S) (10)

τ in formula₁And τ₂It is the two-way pulsewidth output signal that two semiconductor gauges are corresponding, R₁And R₂Increased resistance value measurement unit for semiconductor gauge is Ω, C₀(F) it is mica standard electric capacity, about 0.72 × 10^-6F, above formula shows pulsewidth output and respective institute connecting resistance R₁And R₂It is directly proportional.

Four, when multifactor input, the decoupling of synthesis response processes

At τ₁And τ₂In be implied with water vapor partial pressure P_WWith two kinds of information of temperature t, how to allow it separate at follow-up Data processing, information need to be realized by data decoupler technology and separate and restore.

R₁And R₂Resistance variations formula is:

$R_1=R_0\·EXP\[B(\frac{1}{T}-\frac{1}{T_0})\]+{\mathrm{\ΔR}}_{\mathrm{\ϵ}1}\left(\mathrm{\Ω}\right)---\left(11\right)$

$R_2=R_0\·EXP\[B(\frac{1}{T}-\frac{1}{T_0})\]+{\mathrm{\ΔR}}_{\mathrm{\ϵ}2}\left(\mathrm{\Ω}\right)---\left(12\right)$

R in formula₀Resistance on the basis of=1000 Ω；B=4850 (K) is the resistance temperature coefficient of semiconductor gauge；T₀=273 (K) are reference temperature(TR)；T (K) is input temp；ΔR_{ε 1}With Δ R_{ε 2}It is respectively R₁And R₂The resistance delta each produced under atmospheric pressure encourages.From above two formulas, if allowing Δ R_{ε 1}With Δ R_{ε 2}Numerical value is identical, but positive and negative on the contrary, i.e. (11) and (12) formula becomes:

$R_1=R_0\·EXP\[B(\frac{1}{T}-\frac{1}{T_0})\]+{\mathrm{\ΔR}}_{\mathrm{\ϵ}}\left(\mathrm{\Ω}\right)---\left(13\right)$

$R_2=R_0\·EXP\[B(\frac{1}{T}-\frac{1}{T_0})\]-{\mathrm{\ΔR}}_{\mathrm{\ϵ}}\left(\mathrm{\Ω}\right)---\left(14\right)$

Above two formulas are subtracted each other or are added, so that it may isolates P_WInformation, R1+R2=f when being i.e. added is inputted with t two kinds_t(T) R1-R2=f, and when subtracting each other_ε(P_W), i.e. and with the result of difference only and single input information one_to_one corresponding, Δ R_{ε 1}=-Δ R_{ε 2}=Δ R_ε。

Seeing Fig. 4, whole diaphragm outer surface is under differential pressure Δ P effect, with radius r=0.63r₀For boundary, divide into positive and negative two strain regions.By part inner circle Wei Zheng ε district, the center of circle, by periphery excircle part then Wei Fu ε district, on the correct position in these two regions, ε numerical value can be found equal but opposite polarity two points, one is at circle centre position, r₁=0, and another point is calculated as r through (5) formula₂=0.89r₀Place.Two selecting at this and configure the semiconductor gauge that two piece performances are identical, Bing Rangqi center overlaps with reference point on diaphragm, is then achieved that formula (13) and the quantitative relationship of (14).

Formula (13) adds formula (14) obtain

Above formula eliminates ε information to (R₁+R₂) quantitative interference, but R₁And R₂It is respectively coupled in the charge-discharge circuit of 555 chips, therefore cannot be by R₁And R₂Directly it is added, the most just need to process through data operation and realize.If allowing pulsewidth τ₁And τ₂To clock frequency f in single-chip microcomputer₀Counting, then have count value N₁And N₂For:

N₁=τ₁·f₀ (16)

N₂=τ₂·f₀ (17)

τ₁+τ₂=(N₁+N₂)/f₀(S) (18)

Simultaneous above formula, and can obtain through arrangement:

$T=\frac{B}{ln\[\left(EXP\frac{B}{T_0}\right)*\left(\frac{N1+N2}{1000}\right)\]}=\frac{4850}{ln\[5.2*{10}^4*(N1+N2)\]}---\left(19\right)$

Celsius temperature: t=T-273 (DEG C) (20)

In formula, each constant coefficient is at R₀=1000 Ω, C₀=7.2*10^-6F and f₀Calculate under the conditions of=10MHZ.From R₁And R₂Two times transfer information in isolate strain and steam partial pressure P_WEtc. information, (13) formula is deducted (14) formula, can obtain

R1-R2=2 Δ R_ε=2R₀K_ε·ε(Ω) (21)

Recycling τ₁-τ₂=(N₁-N₂)/f₀(5), (9), the simultaneous such as (10) formula, collated obtain,

Δ P=10 (N₁-N2)(Pa) (22)

Formula (19) and (22) are two kinds of input-output characteristic equations of sensor, all have enough sensitivity and resolving power.KnownP in formula_WsCan by temperature t through tabling look-up or following regression equation calculates,

P_Ws=a EXP (b t) (Pa) (23)

In formula, a is 6.16 (Pa), b be 0.064 (1/ DEG C) be fitting constant, then

P_Ws=6.16 EXP (0.064 t) (Pa) (24)

Atmospheric pressure is not a definite value, there are differences with the difference of landing pit height above sea level, the most also the slight change with seasonal temperature change, to P_WCalculating can describe with following formula approx:

P_W=Δ P+P_re-Bf(T)+h·8.76(Pa) (25)

In formula, h is local height above sea level (m), and coefficient 8.76 (Pa/m) is atmospheric pressure attenuation slope, and f (T) is that temperature correction coefficient can be estimated through the matched curve of measured data of experiment.Owing to being 1.02 at coastal area winter summer air pressure change ratio, and it is only 1.0026 in Qinghai Area winter Charpy.All decline with temperature and be increased slightly.Therefore temperature minor impact ought not be considered, and when coastal area, formula (25) can be reduced to:

P_W=Δ P+ (P_re-B)=10 (N₁-N₂)+(P_re-B)(Pa) (26)

One of theoretical basis of this utility model resolving be normal atmosphere be constant, actual atmospheric pressure becomes with local height above sea level, when device territory of use height above sea level with reference to difference in height bigger time, P in formula (3)_dShould be corrected by software, to maintain the data conversion accuracy of water vapor partial pressure power.So this utility model is provided with GPS unit and atmospheric pressure numerical tabular in signal processing unit, GPS unit is connected on signal processing unit the longitude and latitude for alignment sensor mount point, the partial pressure of the dry air intracavity in the atmospheric pressure numerical value i.e. sensor of inquiry mount point, steam partial pressure force value in the air that binding signal processing unit calculates, and then utilize formula (1): P_M=P_d+P_W(Pa) force value of the force value of hybrid atmospheric, i.e. mount point is calculated.

So far, the numerical value of temperature, relative humidity and atmospheric pressure can calculate and solve out, and the Temperature Humidity Sensor that this utility model provides has simple in construction, easy to implement.This utility model obtains through analytic method: steam partial pressure and the difference of sensitive resistance in air, i.e. pulsewidth after quadratic transformation and the difference of the counting to frequency all the time thereof, being directly proportional, atmospheric temperature is then with the logarithm of the counting sum of sensing element inversely.The theoretical basis of this utility model resolving be physical atmosphere be constant, actual atmospheric pressure becomes with local height above sea level, when device territory of use height above sea level is bigger with reference difference in height, should be corrected by software, to maintain the data conversion accuracy of water vapor partial pressure power.

Above in conjunction with accompanying drawing, this utility model is exemplarily described; obviously this utility model implements and is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present utility model design is carried out with technical scheme; or the most improved design of the present utility model and technical scheme are directly applied to other occasion, all within protection domain of the present utility model.

Claims (8)

1. the intelligence control system of a warmhouse booth, it is characterized in that, including processor, key acquisition module, intensity of illumination acquisition module, valve control module and Temperature Humidity Sensor, described processor internal memory and parameter setting module, preserve various plants CO under different illumination intensity in memorizer₂Saturation point, the data collected are exported to processor by Temperature Humidity Sensor, the intensity of illumination that the plant variety data of processor reading key acquisition module input and intensity of illumination acquisition module detect, searches the CO that in memorizer, this kind of plant is corresponding under a certain intensity of illumination₂Saturation point, confirms CO₂The amount of discharging, realizes CO by valve control module₂Release control.

The intelligence control system of warmhouse booth the most according to claim 1, it is characterized in that, described control system also includes fan control module and blower fan (6), described blower fan (6) is in booth internal bidirectional circulating arrangement, and its direction of rotation is internally formed circulating current for making booth.

The intelligence control system of warmhouse booth the most according to claim 2, it is characterized in that, 10 to 20 centimetres of described blower fan (6) height distance ground, forms the 10-20 degree elevation angle with ground, and the direction of rotation of blower fan (6) hoists flowing from lower for making air-flow；Described blower fan (6) wind speed is located at 0.3～1.0m s^-1In the range of；The air exchanging rate of described blower fan (6) is 10h^-1, the start and stop of every 6min blower fan (6) are once.

The intelligence control system of warmhouse booth the most according to claim 1, it is characterised in that described valve one end and CO₂Source of the gas UNICOM, the other end connects airway, a diameter of 2cm of airway, and the other end is closed, at interval of 1 meter of aperture being provided with an a diameter of 2mm on described airway.

The intelligence control system of warmhouse booth the most according to claim 2, it is characterised in that described control system also includes CO₂Concentration detection module, CO₂Concentration detection module is discharging CO₂After gas fertilizer, detect CO in real time₂Concentration change, the CO inside and outside booth₂After concentration is consistent, to booth forced ventilation, during to booth forced ventilation, blower fan (6) work unilateral in booth, its direction of rotation is internally formed one-way flow air-flow for making booth.

The intelligence control system of warmhouse booth the most according to claim 1, it is characterised in that described CO₂The amount of discharging compare CO₂Saturation point low.

The intelligence control system of warmhouse booth the most according to claim 1, it is characterised in that described Temperature Humidity Sensor includes quasiconductor detector unit, two times transfer unit and signal processing unit, quasiconductor detector unit includes two semiconductor gauge R_{ε 1}And R (4)_{ε 2}(5), semiconductor gauge R_{ε 1}And R (4)_{ε 2}(5) being located at radius is r₀Circular film (3) on, circular film (3) is located on U-shaped bearing (1), a dry aeroseal chamber (2) is formed between diaphragm (3) and U-shaped bearing (1), two semiconductor gauges are responded by output resistance under the pressure differential inside and outside diaphragm (3) and Temperature Excitation effect, electrical response signal is converted to pulse width signal by two times transfer unit, and signal processing unit isolates temperature, external and internal pressure difference and relative humidity data by data decoupler.

The intelligence control system of warmhouse booth the most according to claim 7, it is characterised in that described semiconductor gauge R_{ε 1}(4) it is arranged on home position, R_{ε 2}(5) diaphragm (3) 0.89r it is arranged on₀Circle on, the resistance delta numerical value that two semiconductor gauges each produce under air pressure encourages are equal, positive and negative on the contrary.