CN104190574B - A kind of common variable spraying individual nozzle flow controller - Google Patents
A kind of common variable spraying individual nozzle flow controller Download PDFInfo
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- CN104190574B CN104190574B CN201410353467.4A CN201410353467A CN104190574B CN 104190574 B CN104190574 B CN 104190574B CN 201410353467 A CN201410353467 A CN 201410353467A CN 104190574 B CN104190574 B CN 104190574B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M7/00—Special adaptations or arrangements of liquid-spraying apparatus for purposes covered by this subclass
- A01M7/0089—Regulating or controlling systems
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Abstract
The invention discloses a kind of common variable spraying individual nozzle flow controller, including control unit, and the peripheral components that is connected with described control unit and sensor group cells, specifically include CAN transmission circuit, RS232/RS485 circuit, on-vehicle battery, key scan, DC/DC insulating power supply, XC2234L single-chip microcomputer, Multi CAN unit, UART unit, multi-channel PWM maker, amplify protective separation module group and electromagnetic valve group, pressure transducer, velocity sensor, flow transducer, described multi-channel PWM maker is connected with described amplification protective separation module group respectively, described amplification protective separation module group is connected with electromagnetic valve group respectively.The controller of the present invention integrates data acquisition and controls function, facilitate external various kinds of sensors, detect crop with or without the change with feature, thus treatment in accordance with local conditions ground variable farm chemical applying, improve pesticide availability, reducing environmental pollution, the exploitation for variable rate spray machine provides technical support.
Description
Technical field
The present invention relates to a kind of sprayer controller, especially relate to a kind of vehicle-mounted variable rate spray individual nozzle flow controller.
Background technology
Under normal circumstances, crops, during growing, can be encroached on by various pest and disease damages, and therefore spray pesticide is to ensure that the important step of crops healthy growth.But, traditional sprayer controller, it is typically all and manually changes spray parameters, its control accuracy is relatively low, causes a large amount of wastes of pesticide, causes the problem such as ecology, environmental pollution.
In agricultural electric automatization field, accurate variable rate spray is as the agriculture pesticide application technology of a kind of advanced person, it is possible to according to the change of the crop feature that has that it's too late, optionally spray pesticide, be the most progressively promoted in agricultural.This technology can reduce the non-target deposition of pesticide, reduce environmental pollution, improves the availability of pesticide, is conducive to building resource-conserving and environment-friendly society, be agricultural become more meticulous, the requirement of sustainability, Scientific Development and direction；But, the most domestic still lack convenient to operate He practical variable to target flusher in accurate variable rate spray field.
Summary of the invention
Spraying target to realize variable, the present invention provides a kind of common variable spraying individual nozzle flow controller, and it can be according to crop with or without the change with feature, treatment in accordance with local conditions ground intelligent variable spray pesticide.
The technical solution adopted for the present invention to solve the technical problems is as follows:
A kind of common variable spraying individual nozzle flow controller, including control unit, and the peripheral components that is connected with described control unit and sensor group cells；Described control unit is for the control to spraying operation individual nozzle flow, and inside includes that integrated unit, described integrated unit include Multi
CAN unit, UART unit, ADC converting unit, I/O interface, multi-channel PWM maker；Described peripheral components includes CAN transmission circuit, RS232/RS485 circuit, key scan, DC/DC insulating power supply, signal conditioning circuit, I/O isolation circuit, amplifies protective separation module group, and described peripheral components is for providing power supply, data communication, the input of information command and the circuit protection to controller for control unit；Described sensor group cells includes pressure transducer, velocity sensor, flow transducer, it is respectively used to detect the spraying operation pressure of spraying machine, spraying machine gait of march and nozzle total flow size, person of being easy to spraying operation to its monitor, keep system atomisation pressure, flow normal.
Described control unit respectively by key scan, DC/DC insulating power supply and be manually entered, on-vehicle battery is connected；Described Multi
CAN unit is connected with described CAN transmission circuit; described UART unit is connected with described RS232/RS485 circuit; described pressure transducer is connected with described ADC converting unit by signal conditioning circuit; described velocity sensor, flow transducer are connected with described I/O interface by I/O isolation circuit; described multi-channel PWM maker is connected with described amplification protective separation module group respectively; described amplification protective separation module group is all connected with electromagnetic valve group, for realizing the control to electromagnetic valve group duty and protection.
Further, described control unit is XC2234L single-chip microcomputer, has four serial line interfaces, two passage CAN modules.This single-chip microcomputer operating temperature range width, low-power consumption, also with powerful peripheral hardware collection, the load of CPU can be reduced, data prediction function is strong.
Further; described amplification protective separation module group include Darlington drive circuit, photoisolator, MOSFET drive circuit, can flow recovery protector, transient voltage suppression circuit; described Darlington drive circuit connects photoisolator; described photoisolator connects MOSFET drive circuit; described MOSFET drive circuit connects can flow recovery protector; described can connect transient voltage suppression circuit by flow recovery protector, for realizing controlling in real time and protective effect to circuit each electromagnetic valve.
Further, the model of described DC/DC insulating power supply is WRF1205P-3WR2, uses DIP small size integration packaging.
Further, described can the model of flow recovery protector be OZCC0075AF2B resettable fuse, uses PTC encapsulation.
Further, described transient voltage suppression circuit uses SA serial model No. to be the TVS diode of SA20A.It is a kind of high-effect protection device, has that volume is little, power is big, cheap, the advantage of fast response time.So it can be better achieved PWM controls flow linearity, electromagnetic valve is preferably coordinated to carry out flow-control.
Further, the control signal that described PWM maker produces includes the port number of flow-control, the complementary output arranged between the PWM frequency of each passage, adjacency channel, PWM duty cycle update cycle.Wherein, complementary output between the port number of flow-control, the PWM frequency of each passage, adjacency channel, PWM duty cycle update cycle etc. not only can conveniently realize selecting, and this PWM maker autgmentability and motility are preferable.
Further, described common variable spraying individual nozzle flow controller uses the paster packaging of high integration, circuit board uses two-sided patch design, described MOSFET have employed double N-channel SO-8 encapsulation, this encapsulation has less volume, higher switching frequency, ultralow conducting resistance, various types of electromagnetic valve nozzle can be applicable to drive, its high frequency characteristics is substantially better than solid-state relay and drives Characteristics of Solenoid Valve, whole controller has high integration, volume is little, low in energy consumption, waterproof antidetonation, the feature such as highly versatile.
Further, assembly of the invention also includes central controller and the ancillary equipment being connected with described central controller, the ancillary equipment of described central controller includes machine vision sensor, GPS, prescription map, laser sensor, described machine vision sensor, GPS, prescription map, laser sensor are all connected with central controller, the ancillary equipment of described central controller is used for obtaining spraying operation place clarification of objective information, and controller provides the spray value of each object element accordingly；Described sensor group also includes ultrasonic sensor and infrared sensor, for detecting presence or absence and the specific features information of crop.
The invention has the beneficial effects as follows, the vehicle-mounted variable-flow sprayer controller various piece of foregoing invention may make up module, according to application scenario and the difference of requirement, changes module number flexibly, uses CAN assembly or RS232/RS485 to realize the communication of modules unit.It addition, this controller can be connected with electromagnetic valve dissimilar, model, it is achieved variable rate spray dispenser, the variablees such as variable fertilization can also be applied to and spray occasion, when central authorities' disabling controller effect or exception, instruction can be manually entered and control controller, complete variable rate spray operation.This kind control system based on PWM response time is much faster compared with the response time of traditional control system based on pressure, and the above makes system possess good practicality, versatility, autgmentability；Additionally, this controller can be according to crops specific features information, variable, sprinkling precisely accordingly, on the premise of ensureing that crops well grow, decrease Pesticide use amount, reach the purpose preserved the ecological environment, economize on resources.
Accompanying drawing explanation
Fig. 1 is a kind of common variable spraying individual nozzle flow controller structure principle chart.
Detailed description of the invention
The detailed description of the invention of the present invention is expanded on further below in conjunction with the accompanying drawings.
A kind of common variable spraying individual nozzle flow controller as shown in Figure 1, including control unit, and the peripheral components that is connected with described control unit and sensor group cells；Described control unit is for the control of individual nozzle flow of spraying, and inside includes that integrated unit, described integrated unit include Multi
CAN unit, UART unit, ADC converting unit, I/O interface, multi-channel PWM maker；Described peripheral components includes CAN transmission circuit, RS232/RS485 circuit, key scan, DC/DC insulating power supply, signal conditioning circuit, I/O isolation circuit, amplifies protective separation module group, for providing, for control unit, the electromagnetic valve that power supply, data communication, the input of information command, circuit protection and variable spray to controller use；
In embodiments of the invention (see figure 1) use 20 road PWM makers, 20 groups of Darlington drive circuits, 20 groups of photoisolators, 20 groups of MOSFET drive circuits, 20 groups can flow recovery protector, 20 groups of transient voltage suppression circuits in order to connect 20 way solenoid valves (A1～A20).
Described sensor group cells includes pressure transducer, velocity sensor, flow transducer, is respectively used to detect spraying machine spraying operation pressure, the gait of march of spraying machine and nozzle total flow size.Context information according to spraying operation place target and the requirement of spraying precision, select one or more sensors, detect the characteristic information of spray target.The target specific features information that singlechip controller returns according to object detection sensor, the spraying machine gait of march detected in conjunction with velocity sensor, generate the pwm control signal of different duty, pressure transducer, flow transducer detect atomisation pressure and the nozzle total flow size of spraying machine in real time, person of being easy to spraying operation to its monitor, keep system atomisation pressure, flow normal.
Described control unit respectively by key scan, DC/DC insulating power supply and be manually entered, on-vehicle battery is connected；Described Multi
CAN unit is connected with described CAN transmission circuit; described UART unit is connected with described RS232/RS485 circuit; described pressure transducer is connected with described ADC converting unit by signal conditioning circuit; described velocity sensor, flow transducer are connected with described I/O interface by I/O isolation circuit; described multi-channel PWM maker is connected with described amplification protective separation module group respectively; described amplification protective separation module group is all connected with electromagnetic valve group, for realizing the control of electromagnetic valve group duty and the protective effect to circuit.
Described control unit is XC2234L single-chip microcomputer, has four serial line interfaces, two passage CAN modules.This singlechip controller is the automobile specified microcontroller that Infineon company of Germany produces, and normal working temperature scope is-40 DEG C～125 DEG C, low-power consumption, and highest frequency, up to 66MHz, also with powerful peripheral hardware collection, can reduce the load of CPU.Carrying quick 12 ADC converting units, it is possible to provide data prediction function, the conversion time is low reaches 1.2 μ s.
Described amplification protective separation module group include Darlington drive circuit, photoisolator, MOSFET drive circuit, can flow recovery protector, transient voltage suppression circuit; described Darlington drive circuit connects photoisolator; described photoisolator connects MOSFET drive circuit; described MOSFET drive circuit connects can flow recovery protector; described can connect transient voltage suppression circuit by flow recovery protector, for realizing controlling in real time and protective effect to circuit each electromagnetic valve.
The model of described DC/DC insulating power supply is WRF1205P-3WR2, uses DIP small size integration packaging.This DC/DC insulating power supply is that Guangzhou height-rise sun Science and Technology Ltd. produces, and has short-circuit self-protection function, and normal working temperature scope is-40 DEG C～85 DEG C, and Width funtion input is 9～18 VDC, and output voltage is 5 VDC.
Described can the model of flow recovery protector be OZCC0075AF2B resettable fuse, uses PTC encapsulation.This can flow recovery protector, for Bel Fuse company limited of the U.S. produce, normal working temperature scope is-40 DEG C～85 DEG C, and holding electric current is 0.75A, and tripping current is 1.5A, and rated voltage is up to 24V.
Described transient voltage suppression circuit uses SA serial model No. to be the TVS diode of SA20A.This transient voltage suppression circuit is the U.S.
Littelfuse company limited produces, and can bear the backward voltage of 20V, and Maximum Reverse Leakage Current is 1 μ A, and maximum clamp voltage is 32.4V.
It is pointed out that in control system, electromagnetic valve reverse potential suppression circuit uses the TVS semiconductor diode with avalanche characteristic, replaces conventional 1N4007 diode.Comparatively speaking, the TVS diode used in the transient voltage suppression circuit used in the present invention, it is a kind of high-effect protection device, has that volume is little, power is big, cheap, the advantage of fast response time.TVS diode response speed is PS level, when its two ends are by reverse transient state high energy impact events, it can be with the speed bearing 12 power second-times of 10, the high impedance of its two interpolar is become Low ESR, absorb the surge power of up to thousands of watts, make the voltage clamp at the two poles of the earth at a safety value, reverse leakage current representative value is only a few Miao An, belong to bipolar devices, in conjunction with electromagnetic valve self character, the parameter that choosing then matches, therefore it can be better achieved PWM and control flow linearity, preferably coordinates electromagnetic valve to carry out flow-control.
The control signal that the PWM maker of described controller produces is realized by software programming, autgmentability and motility are preferable, can conveniently select the port number of flow-control, the complementary output arranged between the PWM frequency of each passage, adjacency channel, PWM duty cycle update cycle etc..
Described common variable spraying individual nozzle flow controller uses the paster packaging of high integration, and circuit board uses two-sided patch design, and described MOSFET have employed double N-channel SO-8 encapsulation.The flow controller of the present invention, uses MOSFET to be used as high-speed electronic switch, and it is by the U.S.
International rectifier company produces, and model is IRF7103, uses the SO-8 encapsulation of N-channel, and volume is little, and switching frequency is high, and conducting resistance is low.The switching device of conventional solid-state relay, due to its mechanical property can not the quick acting with change in electric, cause system output time delay problem, the present invention utilizes the characteristic of MOSFET high-speed switch, this problem can be solved well.
Flow controller in the present invention can be according to spraying operation place, the concrete condition of crop and information, external central controller and the ancillary equipment being connected with central controller and sensor group on single-chip microcomputer, the prescription map generated including machine vision sensor, GPS, the information that obtained by GPS, laser sensor, ultrasonic sensor, infrared sensor.External central controller can be connected with machine vision sensor, laser sensor, GPS and obtain spraying operation place clarification of objective information, the size in spraying operation place, shape is measured by GPS, it is divided into several subdivisions, utilize agricultural experts' knowledge, pest and disease damage degree in all subregion is investigated, system, according to information above, provides the spray value of unit, i.e. generates spraying prescription map.Central controller, according to the information received, generates master control instruction, is transferred to singlechip controller by the CAN transmission circuit of single-chip microcomputer, RS232/RS485 circuit, and single-chip microcomputer master control accordingly instructs, and generates corresponding individual nozzle PWM vari-able flow control signal.
Above-mentioned control system also can external ultrasonic sensor or infrared ray sensor, for detecting the presence or absence of crop.Isolating circuit by signal conditioning circuit, I/O respectively, be connected to the ADC converting unit of single-chip microcomputer, I/O interface to obtain spraying operation place clarification of objective information, single-chip microcomputer produces the pwm signal of duty ratio corresponding accordingly.
Described electromagnetic valve is preferably U.S. Capstan Ag Systems company and is produced, and its switching frequency higher, low in energy consumption (6W), design introduces the reverse absorbing circuit of electromagnetic valve of uniqueness, and switching frequency reaches 10Hz also can reach the preferable flow-control linearity.
Controller noted above can be with external various sensors, including the sensor of the various real-time parameters in perception measured target feature and spray process.Have on controller sheet and cutting can control software, carry out parameter setting by upper computer software, set electromagnetic valve switch frequency according to electromagnetic property used, various sensors are carried out the functions such as demarcation.Running control software, the Various types of data information obtained in real time according to sensor, form the flow-control decision-making being characterized as foundation with destination object in conjunction with control algolithm, by solenoid-driven and protection circuit, it is achieved to individual nozzle flow-control.
The operation principle of the present invention and work process be: by the buck circuit of DC/DC insulating power supply, and the 12V DC source that on-vehicle battery provides is converted to isolated DC power supply, and then provide to XC2234L single-chip microcomputer and control voltage.System can replace human eye by external vision sensor, obtains Active workings disease pest and weed information in real time, and passes to central controller.The most also can external laser sensor, utilize the features such as its precision is high, scanning speed is fast, the velocity information that obtains in conjunction with velocity sensor, software programming algorithm, obtained the 3D information of measured target, then obtained the specific features information of crop by the method reconstruct of feature extraction.If the required precision to spraying is the highest, ultrasonic sensor or infrared sensor can also be used to detect the presence or absence of crop, the gait of march of vehicle-mounted spraying system is detected according to velocity sensor, pressure transducer obtains atomisation pressure information, flow in conjunction with bleed type and each nozzle correspondence target area of flow-control model realization independently controls, thus carries out the rough variable rate spray that precision is relatively low.To sum up, one or more sensors can be selected according to spraying place concrete condition, accurately obtain the information such as the shape of crop, size, color, density, locus.
The pressure transducer of control system is used for detecting the atomisation pressure of medicine-chest, passes it to single-chip microcomputer by the ADC converting unit of signal conditioning circuit and single-chip microcomputer.Velocity sensor, flow transducer detect gait of march and the nozzle spray medicine total flow information of spraying machine in real time, and pass to singlechip controller by I/O isolation circuit and I/O interface.Atomisation pressure, the spraying machine speed of travel, spray medicine flow information and the bleed type that XC2234L single-chip microcomputer returns according to sensor, according to the control program write in advance and the information with crop feature received, form the pwm signal of the multichannel different duty of individual nozzle.The pwm signal that single-chip microcomputer generates is through the driving of Darlington drive circuit, photoisolator thus triggers MOSFET conducting, realizes solenoid valve conduction control further.
When external central controller, it is in addition to can carrying out communication by CAN, it is also possible to by RS232/RS485 and single-chip microcomputer UART unit, it is achieved the data communication of demands different from single-chip microcomputer.On the one hand, central processing unit can be according to crop specific features information to XC2234L single-chip microcomputer transmission specific sprinkling master control instruction, on the other hand, XC2234L single-chip microcomputer by sensor acquisition data information transfer to central processing unit, realize the feedback control of Guan Bi, and then reach accurate, the purpose of target spraying.
According to the vari-able flow control system designed in the present invention and electromagnetic valve switch characteristic, the PMW signal frequency generated is 10Hz, under different atomisation pressures, conventional all kinds of nozzles are carried out great many of experiments, analysis of experimental data obtains the relation of individual nozzle flow Q corresponding control signal PWM duty cycle DC, can carry out approximate representation with mathematical equation of linear regression, physical relationship is as follows:
Q=a*DC+b
Wherein, Q is the flow (L/min) of nozzle, and DC is the dutycycle (%) of pwm signal, a and b is correction coefficient, and when bleed type difference, spray operations pressure difference, corresponding correction coefficient a, b are the most different.Specifically choose such as following table:
| Bleed type | Atomisation pressure (kpa) | Equation of linear regression |
| XR8002 | 138 | Q=0.0055*DC+0.0290 |
| XR8002 | 207 | Q=0.0070*DC+0.0143 |
| XR8002 | 276 | Q=0.0075*DC+0.0458 |
| XR8002 | 345 | Q=0.0088*DC+0.0228 |
| XR8003 | 207 | Q=0.0098*DC+0.0297 |
| XR8004 | 207 | Q=0.0118*DC+0.0710 |
Wherein, XR8002,
XR8003, XR8004 are nozzles conventional in agricultural spray.
Owing to optoisolator possesses the strongest anti-interference and common-mode rejection properties so that signal therein can only one-way transmission, therefore input and outlet chamber can mutually isolated, the most unaffected.The action of electromagnetic valve is to be determined by the height of the pwm signal level exported, and when pwm signal is high level, electromagnetic valve is opened；Otherwise, electromagnetic valve then cuts out.It is to be noted, electromagnetic valve triggers moment, due to its inductance characteristic, circuit there will be bigger counter electromotive force, may be more than the drain-source breakdown voltage of MOSFET, cause it to damage and lost efficacy, therefore introduce transient voltage suppression circuit in the controller, utilize TVS semiconductor diode to absorb reverse surge voltage.When there is overvoltage; it can at a very rapid rate (PS level); the high impedance of its two interpolar is become Low ESR; absorb the surge power of up to thousands of watts; make the voltage clamp at the two poles of the earth at a safety value; and then protection circuit, when PWM duty cycle is less, bigger, it can control flow output and have the preferable linearity.Controller has been simultaneously introduced can flow recovery protector, its can within a short period of time response circuit short trouble, it is to avoid MOSFET damages inefficacy because of short trouble.Can flow recovery protector and transient voltage suppression circuit synergism, reach the purpose that electronic device in protection circuit normally works.
In implementing the present invention, it may, controller introduces the function being manually entered, when central processing unit lost efficacy or be abnormal, input instruction manually, by key scan, the PWM of each passage is instructed and passes to single-chip microcomputer, it is achieved the purpose that Independent fluxes controls.XC2234L microcontroller is according to being manually entered information, rational sprinkling scheme is given in conjunction with information such as the spraying operation place information of sensor passback, vehicle-mounted spraying system gait of march, medicine-chest spray pressure, flow information, bleed types, the 20 road PWM makers that XC2234L single-chip microcomputer is internally integrated, produce the pwm signal of 20 tunnel different duty accordingly.Electromagnetic valve trigger voltage in this controller is 12V; therefore by Darlington drive circuit, the pwm signal produced need to be amplified 12V; by photoisolator, MOSFET drive circuit, flow recovery protector, transient voltage suppression circuit can be transmitted to outfan; realize the real-time control to each electromagnetic valve, reach accurate, the purpose of target spraying.
Being manually entered, as standby functions, its introducing is particularly important so that the design of controller is more perfect.When in case of emergency, such as spraying operation person is uncomfortable, need to close all electromagnetic valves immediately.This function makes the operation of controller become more flexible, designs more hommization, embodies the objective that people-oriented.
Above-described vehicle-mounted variable-flow sprayer controller various piece may make up module, according to application scenario and the difference of requirement, changes module number flexibly, uses CAN assembly or RS232/RS485 to realize the communication of modules unit.It addition, this controller can be connected with electromagnetic valve dissimilar, model, it is achieved variable rate spray dispenser, the variablees such as variable fertilization can also be applied to and spray occasion, when central authorities' disabling controller effect or exception, instruction can be manually entered and control controller, complete variable rate spray operation.This kind control system based on PWM response time is much faster compared with the response time of traditional control system based on pressure, and the above makes system possess good practicality, versatility, autgmentability.
Above example is merely to illustrate technical scheme; rather than limiting the scope of the invention; although having made to explain to the present invention with reference to preferred embodiment; it will be understood by those within the art that; technical scheme can be modified or equivalent; without deviating from the spirit and scope of technical solution of the present invention, it all should be contained within scope of the presently claimed invention.
Claims (9)
1. a common variable spraying individual nozzle flow controller, it is characterised in that: include control unit, and with described
Peripheral components that control unit is connected and sensor group cells；
Described control unit is for the control to spraying operation individual nozzle flow, and inside includes integrated unit, described integrated list
Unit includes Multi CAN unit, UART unit, ADC converting unit, I/O interface, multi-channel PWM maker；
Described peripheral components include CAN transmission circuit, RS232/RS485 circuit, key scan, DC/DC insulating power supply,
Signal conditioning circuit, I/O isolation circuit, amplification protective separation module group, described peripheral components is for providing electricity for control unit
Source, data communication, the input of information command and the circuit protection to controller；
Described sensor group cells includes pressure transducer, velocity sensor, flow transducer, is respectively used to detect spraying machine
Spraying operation pressure, the gait of march of spraying machine and nozzle total flow size；
Described control unit respectively by key scan, DC/DC insulating power supply and be manually entered, on-vehicle battery is connected；Institute
State Multi CAN unit to be connected with described CAN transmission circuit, described UART unit and described RS232/RS485 electricity
Road is connected, and described pressure transducer is connected with described ADC converting unit by signal conditioning circuit, described velocity pick-up
Device, flow transducer are connected with described I/O interface by I/O isolation circuit, and described multi-channel PWM maker is respectively and institute
Stating amplification protective separation module group to be connected, described amplification protective separation module group is all connected with electromagnetic valve group, is used for realizing
Control and protection to electromagnetic valve group duty.
Common variable the most according to claim 1 spraying individual nozzle flow controller, it is characterised in that: described control
Unit is XC2234L single-chip microcomputer, has four serial line interfaces, two passage CAN modules.
Common variable the most according to claim 1 spraying individual nozzle flow controller, it is characterised in that: described amplification
Protective separation module group includes Darlington drive circuit, photoisolator, MOSFET drive circuit, can protect by flow recovery
Device, transient voltage suppression circuit, described Darlington drive circuit connects photoisolator, and described photoisolator connects
MOSFET drive circuit, described MOSFET drive circuit connect can flow recovery protector, described can flow recovery protection
Device connects transient voltage suppression circuit.
Common variable the most according to claim 1 spraying individual nozzle flow controller, it is characterised in that: described DC/DC
The model of insulating power supply is WRF1205P-3WR2, uses DIP small size integration packaging.
Common variable the most according to claim 3 spraying individual nozzle flow controller, it is characterised in that: described can be extensive
The model of multiple overcurrent protector is OZCC0075AF2B resettable fuse, uses PTC encapsulation.
Common variable the most according to claim 3 spraying individual nozzle flow controller, it is characterised in that: described transient state
Voltage-suppressing circuit uses SA serial model No. to be the TVS diode of SA20A.
Common variable the most according to claim 1 spraying individual nozzle flow controller, it is characterised in that: described multichannel
The control signal that PWM maker produces includes the port number of flow-control, arranges the PWM frequency of each passage, adjacent logical
Complementary output between road, PWM duty cycle update cycle.
Common variable the most according to claim 3 spraying individual nozzle flow controller, it is characterised in that: described is logical
Use the paster packaging of high integration with variable rate spray individual nozzle flow controller, circuit board uses two-sided patch design,
Described MOSFET have employed double N-channel SO-8 encapsulation.
Common variable the most according to claim 1 spraying individual nozzle flow controller, it is characterised in that:
Also include central controller and the ancillary equipment being connected with described central controller, the periphery of described central controller
Equipment includes machine vision sensor, GPS, prescription map, laser sensor, described machine vision sensor, GPS, prescription
Figure, laser sensor are all connected with central controller, and the ancillary equipment of described central controller is used for obtaining spraying operation field
Ground clarification of objective information, controller provides the spray value of each object element accordingly；
Described sensor group cells also includes ultrasonic sensor and infrared sensor, special with concrete for detecting the presence or absence of crop
Reference ceases.
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| CN104521929B (en) * | 2014-12-17 | 2017-05-03 | 江苏大学 | Variable flow spraying method based on plant target characteristic independent nozzle control |
| CN104932550A (en) * | 2015-06-03 | 2015-09-23 | 江苏大学 | Variable spray nozzle automatic tracking system based on wind speed anemoscope, and control method thereof |
| CN112512314A (en) * | 2018-04-20 | 2021-03-16 | 智能农业解决方案有限责任公司 | Continuously variable nozzle system with integrated flow meter |
| CN109673608B (en) * | 2019-01-08 | 2021-04-20 | 江苏大学 | Non-backflow constant-pressure variable spray control system and method |
| CN110178817A (en) * | 2019-05-14 | 2019-08-30 | 江苏大学 | A kind of variable farm chemical applying information processing system and method |
| CN110741797B (en) * | 2019-09-16 | 2020-10-27 | 北京农业智能装备技术研究中心 | Adaptive variable spraying control device and method |
| GR1009982B (en) * | 2020-04-26 | 2021-04-22 | Παντελεημων Κωνσταντινου Κελεσης | Electronic spayer for linear cultivations |
| CN113519489B (en) * | 2021-07-28 | 2022-08-09 | 山东理工大学 | PWM (pulse-width modulation) electronic control precise spraying system |
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| AU2009203181B2 (en) * | 2008-08-01 | 2015-08-20 | Capstan Ag Systems, Inc. | A method and system to control flow from individual nozzles while controlling overall system flow and pressure |
| JP5161150B2 (en) * | 2009-05-19 | 2013-03-13 | 株式会社やまびこ | Sprinkling amount control device and controlling method for control machine |
| CN203164717U (en) * | 2013-03-19 | 2013-08-28 | 江苏大学 | Intelligent PWM (Pulse-Width Modulation) intermittent spray type variable spray controller |
| CN203422645U (en) * | 2013-04-08 | 2014-02-05 | 江苏大学 | Electronic PWM intermittent spray type variable spray controller |
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2014
- 2014-07-24 CN CN201410353467.4A patent/CN104190574B/en active Active
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