CN112109895A - Unmanned aerial vehicle spray control method based on temperature and pressure monitoring - Google Patents
Unmanned aerial vehicle spray control method based on temperature and pressure monitoring Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D1/00—Dropping, ejecting, releasing, or receiving articles, liquids, or the like, in flight
- B64D1/16—Dropping or releasing powdered, liquid, or gaseous matter, e.g. for fire-fighting
- B64D1/18—Dropping or releasing powdered, liquid, or gaseous matter, e.g. for fire-fighting by spraying, e.g. insecticides
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
- B64U2101/00—UAVs specially adapted for particular uses or applications
Abstract
The invention provides an unmanned aerial vehicle spray control method based on temperature and pressure monitoring, which comprises the following steps: initializing after the unmanned aerial vehicle spraying system is powered on, and periodically starting to acquire a temperature value and a pressure value after the initialization is finished; when the detected temperature value is lower than a lower temperature limit value t1, the controller controls the temperature control switch to be switched on so as to start heating, and when the detected temperature value is higher than an upper temperature limit value t2, the controller switches off the temperature control switch so as to stop heating; when the detected pressure value is lower than the lower pressure limit value p1, the controller starts the motor to work and controls the frequency converter to gradually increase the pressure through the first control value; when the detected pressure value is higher than the upper limit value p2, gradually reducing the pressure by controlling the frequency converter; when the detected temperature and pressure are within the tolerance interval, the system is maintained to operate constantly. The invention can alarm in the first time to avoid danger when the pressure and temperature are out of control and the equipment state is abnormal, thereby greatly improving the reliability and stability of the system.
Description
Technical Field
The invention relates to the field of control, in particular to an unmanned aerial vehicle spray control method based on temperature and pressure monitoring, and is particularly suitable for precise pesticide application of an unmanned aerial vehicle.
Background
Along with the development of wisdom agricultural, all kinds of machines of giving medicine to poor free of charge are used widely to satisfy the needs of various farming scenes, wherein, unmanned aerial vehicle spraying mode relies on advantages such as high efficiency, extensive, convenient and has obtained very big popularization.
Wherein, the temperature and the pressure of unmanned aerial vehicle spraying are the prerequisite of accurate application of medicine, if the temperature is low with pressure at the in-process of unmanned aerial vehicle spraying, can lead to the fog drop number that the atomizing produced not enough, and temperature and pressure are too high, can lead to the spraying medicine to take place chemical reaction, lose the drug effect again. Also need ensure the temperature and the pressure value that unmanned aerial vehicle atomizer produced in the index of safety from safe angle, avoid causing the explosion because too big temperature of pressure or pressure are too high.
However, the temperature and pressure problem in the pesticide application process can not be solved very much to current unmanned aerial vehicle spraying system. For example, if the pressure is continuously applied, the pressure is strongly applied, and the like, explosion is easily generated. In addition, current unmanned aerial vehicle water-spraying system also can't accomplish effectively discernment when the state takes place abnormal change in the use, also can not in time solve the problem high-efficiently when breaking down. For example, wear and aging of the chamber can lead to more serious damage if the pressure leaks out of the chamber that cannot be handled in a timely manner.
Therefore, how to realize the spray control more intelligently is a great problem which needs to be solved urgently at present.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an efficient and safe unmanned aerial vehicle spray control method based on temperature and pressure monitoring, which can be applied to various use scenes needing heating and pressurizing, including the precise pesticide application of the unmanned aerial vehicle, realizes the advantages of high efficiency heating and pressurizing, safety and explosion prevention, and is controlled precisely and conveniently.
In order to achieve the purpose of the invention, the invention provides an unmanned aerial vehicle spray control method based on temperature and pressure monitoring, which comprises the following steps: 1) initializing after the unmanned aerial vehicle spraying system is powered on, and periodically starting to acquire a temperature value and a pressure value after the initialization is finished; 2) when the detected temperature value is lower than a lower temperature limit value t1, the controller controls the temperature control switch to be switched on so as to start heating, and when the detected temperature value is higher than an upper temperature limit value t2, the controller switches off the temperature control switch so as to stop heating; when the detected temperature value is in the interval [ t1, t2], the controller maintains the temperature to be constant; 3) when the detected pressure value is lower than the lower pressure limit value p1, the controller starts the motor to work and controls the frequency converter to gradually increase the pressure through the first control value; when the detected pressure value is higher than the upper limit value p2, gradually reducing the pressure by controlling the frequency converter; when the detected pressure value is in the interval [ p1, p2], the controller maintains the pressure constant, wherein t1< t2, p1< p 2; the system adopts a mode of controlling a motor by an external frequency converter so as to control the pressure of the pipeline.
Wherein the controlling of the pressure comprises: the pressure switch output terminal of the controller is connected with the coil control side of the AC contactor and used for controlling the on-off of the switch of the AC contactor, and the pressure analog output terminal of the controller is connected with the control input end of the frequency converter and used for controlling the output of the frequency converter, so that the rotating speed of the motor is adjusted.
The first control value is controlled by adopting a fuzzy control algorithm according to the boosting condition, and the fuzzy control algorithm is as follows: the rate of increasing pressure is controlled according to the pressure difference value collected in the previous and the next two times and the established fuzzy table, the fuzzy table stores a plurality of pressure difference value intervals and boosting rates which are in one-to-one correspondence with the intervals, and when the pressure values collected in the previous and the next two times are detected in a fixed time period, the interval of the pressure difference value in the fuzzy table is judged, and corresponding control output is correspondingly given.
Further, when the temperatures detected for the continuous preset times are higher than the upper temperature limit or the pressures detected for the continuous preset times are higher than the upper pressure limit, an abnormal alarm is given through the alarm output circuit.
The control method also comprises a key detection step for judging whether a key event exists to execute intervention control, wherein the intervention control comprises forced shutdown, upper limit value setting, lower limit value setting and alarm setting.
In order to further optimize the control, the method further comprises an equipment state detection step, wherein the equipment state detection step is triggered after the spraying is finished and when a stop signal is received, and the following operations are specifically executed: 1) the controller firstly outputs a control signal to maintain the current temperature and stop pressure control, and simultaneously checks the pressure value PD1 at the current moment; 2) detecting the pressure value PD2 again after a preset time TD, judging the pressure change rate (PD1-PD2)/TD in the constant temperature environment after the shutdown, and recording and storing the pressure change rate (PD1-PD 2)/TD; 3) stopping heating, analyzing the deviation between the current change rate and the historical change rate, confirming that the component is abnormal when the deviation is larger, and giving an alarm through an alarm output circuit.
Wherein the analyzing comprises: inputting the historical change rate after the abnormal change rate is eliminated into a neural network model for training so as to obtain the neural network output f (t), wherein f (t) is the normal change rate corresponding to the time t; meanwhile, the system accumulates the current total working time of the equipment to obtain tzAnd determining an aging coefficient gamma corresponding to the total working time of the current equipment according to an equipment aging curvezF (t)z)*γzAs an abnormal judgment reference value T, if the current change rate exceeds [0.8T,1.2T ]]The section (2) is determined to be in case of abnormality of the equipment and needs maintenance.
The alarm output circuit comprises a buzzer and buzzes and alarms when abnormal; the alarm output circuit also comprises a communication circuit which remotely alarms through a wireless network when abnormal so that maintenance personnel can receive fault prompt and process the fault prompt in time at the first time.
The unmanned aerial vehicle spray control method based on temperature and pressure monitoring fills up the technical blank in the field of existing unmanned aerial vehicle spray control, and the spraying system cannot fail due to overheating or overvoltage through double detection and double control of temperature and pressure; furthermore, when the pressure and the temperature are out of control, the alarm can be given out for the first time to avoid danger.
The invention also provides a further optimization scheme: the state data are accurately collected creatively by using the system stop time, so that the abnormity of the machine tool state can be detected at the first time, and the maintenance efficiency is improved by informing maintenance personnel. The state data are obtained based on the natural pressure change under the constant temperature condition, so that the influence caused by the heat exchange between the inside and the outside is avoided, and the accuracy of an analysis result is guaranteed to the maximum extent. The invention can efficiently and intelligently sense the state of the equipment, carry out output control and early warning in time by cooperation of various means, and greatly improve the reliability and stability of the system
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of an unmanned aerial vehicle spray intelligent control system according to an embodiment of the present invention;
fig. 2 is a schematic wiring diagram of an unmanned aerial vehicle spray intelligent control system according to an embodiment of the present invention;
fig. 3 is a pin diagram of an AT89C51 single chip microcomputer according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a temperature and pressure acquisition circuit according to an embodiment of the present invention;
fig. 5 is a flowchart of a system control method according to an embodiment of the present invention;
fig. 6 is a simulation experiment diagram of the intelligent control system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other as needed.
The system of the present invention is described below in conjunction with fig. 1. As shown in fig. 1, the present invention provides an intelligent control system for unmanned aerial vehicle spraying, comprising: the controller can be realized by adopting a single chip microcomputer; the temperature control circuit is used for adjusting the temperature; the pressure control circuit is used for adjusting pressure; a pressure acquisition circuit; a temperature acquisition circuit; and the power supply circuit is used for supplying power to each power utilization module in the system.
Optionally, the controller is further connected with: the crystal oscillator circuit is used for providing a time reference of the working time sequence of the controller; the reset circuit is used for realizing power-on reset and fault reset; the key circuit is used for inputting setting parameters; the acquisition indicating circuit is used for carrying out working indication during temperature and pressure detection; the display circuit is used for displaying the working state; and the alarm output circuit is used for alarming abnormity.
Fig. 2 further illustrates a wiring schematic diagram of the unmanned aerial vehicle spray intelligent control system, wherein the single-chip microcomputer peripheral circuits such as the crystal oscillator circuit, the reset circuit and the key circuit are respectively connected with the single-chip microcomputer and are placed on the PCB together to obtain a single-chip microcomputer control board, and the single-chip microcomputer control board can be implemented by adopting a mature scheme such as a 51 single-chip microcomputer development board, which is not described herein again.
The read temperature acquisition circuit adopts a PT100 platinum resistor temperature sensor, has the advantages of high precision and convenient use, and can be matched with a special temperature transmitter for long-distance transmission. The principle of measuring the temperature through the PT100 platinum resistor is that the resistance of the PT100 platinum resistor sensor changes correspondingly according to different temperatures. The dedicated transmitter can output a standard 4-20mA or 0-20mA signal only by connecting a PT100 platinum resistor and a power supply, and preferably uses the output signal of 0-20 mA. The current signal is selected because the transmitter is equivalent to the output of the constant current source when the temperature sensor is transmitted at a longer distance, so that the error caused by the resistance value of a line is reduced, and when the temperature sensor is connected to the control board in the embodiment through the temperature transmitter, the current signal is converted into a voltage signal of 0-5V through the resistor connected with 250 ohms in series.
The pressure acquisition circuit selects a mode that a pressure sensor is matched with a transmitter, the pressure acquisition principle is similar to the temperature acquisition principle, the difference is that the front-end sensor is replaced by a pressure sensor by PT100, and the transmitter is a pressure transmitter for transmitting pressure signals.
The temperature control circuit is characterized in that a temperature output terminal of the controller is connected with the temperature control switch, so that the temperature control switch is controlled to be switched on or off according to an output signal of the controller. The temperature control output adopts a switching value output mode, and the control mode is that the temperature control switch is switched off to stop heating when the temperature detection value acquired from the temperature sensor is greater than the upper temperature limit value, and the temperature control switch is switched on to start heating when the temperature detection value is less than the lower temperature limit value.
The pressure control circuit adopts an external frequency converter to control the motor, thereby controlling the pressure of the pipeline. Specifically, a pressure switching value output terminal of the controller is connected with a coil control side of the alternating current contactor KM1 and used for controlling on-off of a switch of the alternating current contactor; and a pressure analog quantity output terminal of the controller is connected with a control input end of the frequency converter and used for controlling the output of the frequency converter so as to adjust the rotating speed of the motor. The alternating current power supply, the air switch QS, the controlled switch side of the alternating current contactor KM1, the frequency converter and the motor are sequentially connected in series to form a motor loop. The pressure control mode is that when the pressure detection value obtained from the pressure sensor is smaller than the lower limit value, the control board outputs a switching value signal to control the coil of the alternating current contactor to be electrified and then a switch at the switching side of the alternating current device KM1 to be finally switched on to supply power to the motor, and a pressure analog quantity output terminal of the control board simultaneously inputs a corresponding first control value to the frequency converter; and when the pressure detection value is larger than the upper limit value, reducing the pressure by controlling the frequency converter.
The first control value adopts a mode of increasing from small to large, thereby avoiding overpressure explosion caused by high pressure at first. The control algorithm preferably adopts a fuzzy control algorithm, pressure value variation delta P is obtained by detecting pressure values of two times before and after a certain time, if the variation delta P is less than or equal to a preset value (smaller), the given pressure value is small, the pressure value needs to be increased, if the variation is in an allowable interval, the given value is proper, and if the variation exceeds the preset value, the given value is large, the value needs to be decreased. The default design of the present embodiment is to perform 6-step judgment, that is, the 6 steps of the pressure difference Δ P are respectively: 1, gear 1: less than or equal to 0.05 MPa; 2, gear: greater than 0.05MPa and less than or equal to 0.1 MPa; 3, gear 3: greater than 0.1MPa and less than or equal to 0.15 MPa; 4, gear 4: greater than 0.15MPa and less than or equal to 0.2 MPa; 5, gear: greater than 0.2MPa and less than or equal to 0.25 MPa; 6, gear 6: greater than 0.25MPa and less than or equal to 0.3 MPa. And adopting different adjusting rates according to different gears where the delta P is positioned.
The acquisition indicating circuit indicates the temperature through a first indicating lamp and indicates the pressure through a second indicating lamp. The alarm output circuit comprises a buzzer and buzzes and alarms when abnormal; the system can also comprise a communication circuit which remotely alarms through a wireless network when abnormal conditions occur, so that maintenance personnel can receive fault prompts and timely process the fault prompts at the first time.
The single chip microcomputer can be selected from AT89C51, the pin diagram of the single chip microcomputer is shown in FIG. 3, and the description of the functions of the pins specifically refers to a chip manual.
The pressure sensor is a hydraulic pressure sensor, such as a flat membrane sensor. The working principle is as follows: the pressure acts directly on the diaphragm of the sensor, causing the diaphragm to produce a small displacement proportional to the pressure of the medium, causing a change in the resistance of the sensor, which is detected by electronic circuitry and converted to output a standard electrical signal corresponding to the pressure.
As shown in fig. 4, the acquisition of two analog quantities of temperature and pressure may share a conversion chip, such as PCF8591 shown in fig. 4. The PCF8591 chip is a chip with 4 paths of analog quantity input, 1 path of analog quantity output and an IIC bus, and 8 PCF8591 chips can be hung on the IIC bus at most. The temperature acquisition occupies a first analog acquisition channel AN0, namely AN0 is connected with a temperature sensor; the second path of the analog quantity acquisition channel occupied by pressure acquisition, namely AN1, namely AN1, is connected with a pressure sensor; the analog output is connected to AOUT, J6, and is transmitted to the controller, where the signal level is 0-5V level signal. The SCL and SDA pins of PCF8591 connect to the P1.0 and P1.1 pins of the die, respectively.
The intelligent control method based on the control system is explained below. The method is based on the detection of temperature and pressure, the state of the existing unmanned aerial vehicle spraying machine is further controlled perfectly, and as shown in fig. 5, the unmanned aerial vehicle spraying control method based on the temperature and pressure monitoring comprises the following steps:
after power-on is completed, the system is initialized, temperature and pressure values are collected periodically after initialization is completed, then whether the values are in a normal range or not is judged, and if not, corresponding operation is carried out;
specifically, when the temperature detection value is lower than a lower temperature limit value t1, the control end of the controller is connected with the temperature control switch to start heating, and when the temperature detection value is higher than an upper temperature limit value t2, the controller is connected with the temperature control switch to stop heating; when the temperature detection value is in the interval [ t1, t2], maintaining the temperature to be constant; when the pressure detection value is lower than the lower pressure limit value p1, starting the motor to work, carrying out frequency conversion control through a first control value transmitted to the frequency converter so as to gradually increase the pressure, and simultaneously carrying out fuzzy control according to the boosting condition; when the pressure detection value is higher than the upper limit value p2, the pressure is gradually reduced by controlling the frequency converter; when the pressure detection value is in the section [ p1, p2], the pressure is maintained constant. Fuzzy control of the first controller may be as described above, wherein t1< t2, p1< p 2. The pressure reduction of the frequency converter can also be controlled by fuzzy control. The fuzzy control enables the pressure change rate to be moderate, and the efficiency and the safety of control and adjustment can be considered.
The AN0 channel of the PCF8591 chip is connected with the temperature analog quantity input, the AN1 channel of the PCF8591 chip is connected with the pressure analog quantity input, and the output can indicate the temperature value and the pressure value on the display circuit.
The fuzzy control employed by the present invention is further summarized as follows: and the boosting is controlled according to the pressure difference value acquired in the two times and the established fuzzy table, and when the pressure values acquired in the two times are detected in a time period with a preset length, the interval of the pressure difference value in the fuzzy table is judged, and corresponding output is correspondingly given. When the difference is larger, the speed of the frequency converter is controlled to be reduced, and when the difference is proper, the voltage is boosted and the speed is controlled at a middle speed. When the difference is smaller, the boosting speed of the frequency converter is increased.
And when the temperatures detected for the continuous preset times are higher than the upper temperature limit or the pressures detected for the continuous preset times are higher than the upper pressure limit, performing abnormity alarm through the alarm output circuit. When the predetermined number of times continues, the predetermined number of times may be determined according to experimental statistics or set according to actual requirements, for example, no adjustment for 20 times can make the parameter normal, i.e., the surface equipment is out of order.
Further, the control method further includes a key detection subroutine for determining whether there is a key event to perform intervention control, such as forced shutdown, upper limit setting, lower limit setting, etc. The intervention control can also comprise alarm setting, namely setting of an alarm mode according to actual needs, such as but not limited to contact mode modification, alarm condition modification and the like. By the method, timely troubleshooting and alarming can be effectively realized.
In order to overcome the problem that the state of the component cannot be detected in time in the prior art, the invention also provides the following conception: and starting a state checking sub-program when a stop signal is received every time after spraying is finished, and specifically executing the following operations:
1) the controller firstly outputs a control signal to maintain the current temperature and stop pressurizing, and simultaneously checks the pressure value PD1 at the current moment;
2) detecting the pressure value PD2 again after a preset time TD, judging the pressure change rate (PD1-PD2)/TD in the constant temperature environment after the shutdown, and recording and storing the pressure change rate (PD1-PD 2)/TD;
3) stopping heating, analyzing the deviation between the current change rate and the historical change rate, confirming that the component is abnormal when the deviation is large, and reminding maintenance personnel through an alarm output circuit.
Further, the analysis may be based on neural network analysis, specifically, the historical change rate after the abnormal change rate is eliminated is input into a neural network model to be trained to obtain a neural network output f (t), and f (t) represents the normal change rate corresponding to the working time t; meanwhile, the system accumulates the current total working time of the equipment to obtain tzAnd determining an aging coefficient gamma corresponding to the total working time of the current equipment according to an equipment aging curvezF (t)z)*γzAs an abnormal judgment reference value T, if the current change rate exceeds [0.8T,1.2T ]]The section (2) is determined to be in case of abnormality of the equipment and needs maintenance.
The invention creatively combines state monitoring with machine recovery time after shutdown, can efficiently and intelligently sense the state of equipment and early warn in time; and the pressure sensing result deviation caused by heat change is avoided by maintaining the constant temperature condition, and the accuracy of the analysis result is improved. The defects in the prior art are overcome through the conception, and the reliability and the stability of the system are greatly improved.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the scope of the present invention should be determined by the following claims.
Claims (10)
1. An unmanned aerial vehicle spraying control method based on temperature and pressure monitoring is characterized by comprising the following steps:
1) initializing after the unmanned aerial vehicle spraying system is powered on, and periodically starting to acquire a temperature value and a pressure value after the initialization is finished;
2) when the detected temperature value is lower than a lower temperature limit value t1, the controller controls the temperature control switch to be switched on so as to start heating, and when the detected temperature value is higher than an upper temperature limit value t2, the controller switches off the temperature control switch so as to stop heating; when the detected temperature value is in the interval [ t1, t2], the controller maintains the temperature to be constant;
3) when the detected pressure value is lower than the lower pressure limit value p1, the controller starts the motor to work and controls the frequency converter to gradually increase the pressure through the first control value; when the detected pressure value is higher than the upper limit value p2, gradually reducing the pressure by controlling the frequency converter; when the detected pressure value is within the interval [ p1, p2], the controller maintains the pressure constant; wherein t1< t2, p1< p 2; and the system adopts a mode of controlling the motor by an external frequency converter so as to control the pressure of the pipeline.
2. The control method according to claim 1, wherein the controlling of the pressure includes: the pressure switch output terminal of the controller is connected with the coil control side of the AC contactor and used for controlling the on-off of the switch of the AC contactor, and the pressure analog output terminal of the controller is connected with the control input end of the frequency converter and used for controlling the output of the frequency converter, so that the rotating speed of the motor is adjusted.
3. A control method according to claim 1, characterized in that the first control value is controlled by means of a fuzzy control algorithm in dependence on the boost situation.
4. A control method according to claim 3, characterized in that the fuzzy control algorithm is as follows: the rate of increasing pressure is controlled according to the pressure difference value collected in the previous and the next two times and the established fuzzy table, the fuzzy table stores a plurality of pressure difference value intervals and boosting rates which are in one-to-one correspondence with the intervals, and when the pressure values collected in the previous and the next two times are detected in a fixed time period, the interval of the pressure difference value in the fuzzy table is judged, and corresponding control output is correspondingly given.
5. The control method according to claim 1, wherein an abnormality alarm is given by an alarm output circuit when the temperatures are detected a predetermined number of times in succession and are each higher than an upper temperature limit or the pressures are detected a predetermined number of times in succession and are each higher than an upper pressure limit.
6. The control method according to claim 1, wherein the control method further comprises a key detection step for determining whether there is a key event to exercise intervention control.
7. The control method according to claim 6, wherein the intervention control includes forced shutdown, upper limit value setting, lower limit value setting, alarm setting.
8. The control method according to any one of claims 1 to 7, characterized in that the method further comprises a device status detection step, which is triggered when a shutdown signal is received after the spraying is finished, and specifically performs the following operations:
1) the controller firstly outputs a control signal to maintain the current temperature and stop pressure control, and simultaneously checks the pressure value PD1 at the current moment;
2) detecting the pressure value PD2 again after a preset time TD, judging the pressure change rate (PD1-PD2)/TD in the constant temperature environment after the shutdown, and recording and storing the pressure change rate (PD1-PD 2)/TD;
3) stopping heating, analyzing the deviation between the current change rate and the historical change rate, confirming that the component is abnormal when the deviation is larger, and giving an alarm through an alarm output circuit.
9. The control method of claim 8, wherein the analyzing comprises: inputting the historical change rate after the abnormal change rate is eliminated into a neural network model for training so as to obtain the neural network output f (t), wherein f (t) is the normal change rate corresponding to the time t; meanwhile, the system accumulates the current total working time of the equipment to obtain tzAnd determining an aging coefficient gamma corresponding to the total working time of the current equipment according to an equipment aging curvezF (t)z)*γzAs an abnormal judgment reference value T, if the current change rate exceeds [0.8T,1.2T ]]The section (2) is determined to be in case of abnormality of the equipment and needs maintenance.
10. The control method according to claim 8, wherein the alarm output circuit includes a buzzer that buzzes an alarm when abnormal; the alarm output circuit also comprises a communication circuit which remotely alarms through a wireless network when abnormal so that maintenance personnel can receive fault prompt and process the fault prompt in time at the first time.
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| CN112109895B (en) | 2022-03-25 |
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