CN113805518B - Fault protection system and method for digital agriculture execution terminal - Google Patents
Fault protection system and method for digital agriculture execution terminal Download PDFInfo
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Abstract
The invention discloses a fault protection system of a digital agriculture execution terminal, which comprises an output management module, a processor module and an external communication module, wherein the processor module is provided with preset operation information; the output management module is configured to automatically check hardware faults of the circuit and send fault information to the processor module; the processor module controls the output management module to stop outputting signals after receiving the fault information so as to control the operation stopping information, the output management module synchronously records the output stopping time and the executed output quantity information before the stopping time and feeds the output stopping signal and the executed output quantity information back to the processor module for storage, and after the fault is relieved, the output management module continues to execute unfinished operation. The invention can detect hardware fault and software abnormal state, and transmits to the control center through network mode, realizes remote management of digital system, and reduces manual detection work.
Description
Technical Field
The invention relates to the field of digital agricultural equipment, in particular to a fault protection system and method of a digital agricultural execution terminal.
Background
The digital agriculture is used for realizing the real-time monitoring and management of crops, soil and the like from macro to micro in the agricultural production process, so as to realize the regular information acquisition and regulation of the growth and development conditions of the crops, the plant diseases and insect pests, the water and fertilizer conditions and the corresponding environment, generate a dynamic spatial information system, simulate the phenomena and the process in the agricultural production, and achieve the purposes of reasonably utilizing agricultural resources, reducing the production cost, improving the ecological environment and improving the crop products and the quality.
The execution terminal in the digital agricultural system is an output component directly acting on the environment and crops, such as an execution element and corresponding software of a fertilizing device, an irrigation device, a temperature and humidity adjusting device and the like, and is a core component in the whole management system.
The execution terminal is a control component for the butt joint environment and the crops, and the control components influence the temperature, the humidity, the gas concentration, the irrigation quantity, the fertilization concentration and the content of the crops and the like in the local environment and are related to the aspects of the crop growth. If the execution terminal fails and the fault guidance is out of control, the growth environment of crops in digital agriculture is directly influenced, the growth process of the crops is influenced, and even some irreversible results are caused. Therefore, while the reliability of the execution terminal is improved, the output of the execution terminal is controlled to be directed to a controlled state when the execution terminal fails, and an alarm is output to reduce the influence, so that the design requirement of the digital agriculture control system is more and more emphasized at present.
Due to the situations and scenes, the current digital agriculture execution terminal fault management method has the following problems:
(1) the hardware fault of the execution terminal is not systematically managed, and only a high-reliability element is selected as far as possible, so that the overall cost of the execution terminal is very high, and importantly, the fault with a certain probability cannot be detected in real time. When a fault results in an uncontrolled output (e.g., failure to ventilate as desired, failure to control the pesticide spray dosage as desired, failure to stop irrigation or fertilizer application, etc.), the actual control deviates significantly from the expected one and a closed loop control of the digital system is not achieved.
(2) In a digital farming system, the executive terminals are often controlled by the software of the distributed subsystem. The lack of protection for bugs present in the software also results in abnormal uncontrolled output, thereby affecting the control performance of the overall system.
(3) Failures of the execution terminals are not managed automatically and in real time, and are usually checked and replaced periodically or in advance in a preventive manner manually. The management efficiency is low, the labor cost is high, and the digital system efficiency is not reflected.
Disclosure of Invention
In order to solve the technical problems, a fault protection system and a fault protection method for protecting the digital agricultural execution terminal are provided, wherein the digital agricultural execution terminal is controlled in a closed-loop and complete mode and software and hardware faults are carried out on the digital agricultural execution terminal.
The technical scheme adopted by the invention is as follows: the utility model provides a fault protection system of digital agriculture execution terminal, includes output management module, processor module and external communication module, wherein:
the processor module is provided with preset operation information;
the output management module is configured to automatically check hardware faults of the circuit and send fault information to the processor module;
the processor module controls the output management module to stop outputting the signal after receiving the fault information so as to control the operation stopping information,
simultaneously, the output management module synchronously records the output stopping time and the executed output quantity information before the stopping time and feeds the output stopping signal and the executed output quantity information back to the processor module for storage;
after the fault is removed, the output management module reads preset operation information and executed output quantity information from the processor module and continues to execute unfinished operations;
the unfinished operation is preset operation information except executed output quantity information.
Preferably, the output management module includes a digital output switch circuit, a protection circuit, and an output self-test circuit, wherein:
the digital output switch circuit, the protection circuit and the output self-checking circuit are all connected with the processor module;
the processor module outputs square wave signals, and the square wave signals are converted into direct current signals through the protection circuit to control a power supply of the digital output switching circuit;
the digital output switch circuit controls the output of the operation signal;
the self-test circuit detects the state of the switching device of the output switching circuit and inputs the result to the processor module.
Preferably, the processor module is a CPU controller.
Preferably, the digital output switch circuit includes two serially connected switch devices and isolated digital driving signals DO and DI, the CPU controller outputs two isolated digital driving signals DO to respectively control the two switch devices, and the normally open contacts of the switch devices are serially connected to output to control the external device.
Preferably, the external device is a digital agriculture execution terminal.
Preferably, the switching device is a relay.
Preferably, if any one electronic device has an open-circuit fault, the output of the external control signal is stopped, and meanwhile, the state of the relay is detected to be inconsistent with the expected state through the input of the digital driving signal DI of the normally closed contacts of the two relays, and then the hardware fault is determined;
if any relay has a contact short-circuit fault and the other relay connected in series is normal, the digital output switch circuit normally outputs an external control signal, and the state of the relay is detected to be inconsistent with an expected state through the input of the digital driving signal DI of the normally closed contacts of the two relays, so that the relay fault is judged.
Preferably, the protection circuit comprises a first circuit branch and a second circuit branch which are parallel and identical, a diode full-wave rectification unit and a harmonic filtering unit;
one end of the first circuit branch and one end of the second circuit branch are connected with the CPU controller, and the other ends of the first circuit branch and the second circuit branch are connected with the diode full-wave rectification unit and the harmonic filtering unit in sequence.
Preferably, the first circuit branch and the second circuit branch both comprise an optical coupling isolation unit, a gate circuit shaping unit and an MOSFET unit which are connected in sequence;
the CPU controller interrupts and outputs two paths of a first square wave and a second square wave which have the same frequency, 180-degree phase difference and 50-percent duty ratio through a timer, and the first square wave and the second square wave respectively enter a circuit branch circuit I and a circuit branch circuit II and then enter a diode full-wave rectification unit together for rectification and then are input to a harmonic filtering unit for filtering, and then direct current signals are output.
A fault protection method of a digital agriculture execution terminal is applied to a fault protection system of the digital agriculture execution terminal, and the method comprises the following steps:
step 1: the CPU controller outputs two paths of square wave signals and controls the normal output work of the output management module through the protection circuit;
step 2: and when the CPU controller detects a software fault, the output of the square wave signal is automatically stopped, the power supply for the output management module is stopped, and the operation of the external equipment is controlled to be stopped.
The steps for detecting software faults in the step 2 are as follows:
step 2-1: when the software time sequence is abnormal, the software cannot clear the counting accumulated value in the timed interrupt function to zero, so that the counting accumulated value exceeds a set threshold value;
step 2-2: and when the timer interrupt service function detects that the calculated accumulated value exceeds a set threshold value, judging that the software fails and stopping the output of the square wave signal.
The invention has the beneficial technical effects that: the invention stops output when a certain element in the circuit fails in various modes through the output management module, synchronously records the output stopping time and the corresponding executed output quantity, ensures that the output of the whole digital control system is controlled, has a memory function, can continuously execute unfinished operation after the fault is eliminated, and ensures that the control of the whole crop environment and the control of crop elements are closed-loop and complete, thereby realizing the protection of hardware faults and ensuring that the crop environment and growth elements are not influenced.
The method and the device of the invention carry out output protection on the fault of the digital agriculture execution terminal, eliminate the hidden trouble of out-of-control output, avoid manual inspection and temporary and urgent treatment, effectively prevent risks and improve the management efficiency.
Drawings
FIG. 1 is a block diagram of the overall architecture of the system of the present invention;
FIG. 2 is a schematic diagram of the structure of the output management module of the system of the present invention;
FIG. 3 is a schematic diagram of a protection circuit in the system of the present invention;
FIG. 4 is a schematic diagram of the overall structure of the CPU controller of the present invention;
FIG. 5 is a flow chart of the steps of the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following embodiments.
The execution terminal fault influence protection system and method corresponding to the invention are used for fault management of the execution terminal for controlling output in digital agriculture, and mainly carry out output protection aiming at hardware faults and software abnormity.
Specifically, as shown in fig. 1 to 4, a fault protection system of a digital agriculture execution terminal includes an output management module, a processor module and an external communication module, wherein:
the processor module is provided with preset operation information, the preset operation information is preset operation information of external equipment, the external equipment in the embodiment is an agricultural execution terminal, namely an output component directly acting on the environment and crops, such as execution elements and corresponding software of fertilization equipment, irrigation equipment, temperature and humidity regulation equipment and the like, and the preset operation information refers to preset fertilization amount, irrigation amount and temperature and humidity regulation range corresponding to different crops.
Specifically, the output management module is configured to automatically check a hardware fault of a circuit and send fault information to the processor module; the processor module controls the output management module to stop outputting signals after receiving the fault information so as to control the operation stopping information, synchronously records the output stopping time and the executed output quantity information before the stopping time, and feeds the output stopping signal and the executed output quantity information back to the processor module for storage; after the fault is removed, the output management module reads preset operation information and executed output quantity information from the processor module and continues to execute unfinished operations; the unfinished operation is preset operation information except executed output quantity information.
The external communication module comprises a wireless communication circuit and a wired communication circuit, and the wireless communication between the device and the server is realized in a full-network-communication 4G mode. The CPU carries out data interaction with the 4G module through the USB port, the communication speed can reach 200Mbps, and sufficient bandwidth can meet application requirements of various fields. The software simply calls a communication protocol interface preset by the device and the server to realize the connection with the data center.
The invention also has a wired communication circuit in an Ethernet form, can carry out real-time wired connection on the device and the server through paths such as a switch, a gateway and the like, has no influence on the communication process by the flow of an operator and has higher speed.
The two communication modes both meet the distributed connection mode of a single data center and a plurality of device terminals, have universal network interaction capacity in various networking applications, and bring great convenience to the field.
The output quantity information of the output management module controls the operation quantity of the agricultural execution terminal, and specifically can be fertilizing quantity, irrigation quantity and temperature and humidity regulating quantity.
Specifically, the specific structure and principle of each module are as follows:
as shown in fig. 2, the output management module includes a digital output switch circuit, a protection circuit, and an output self-test circuit, wherein: the digital output switch circuit, the protection circuit and the output self-checking circuit are all connected with the processor module, the processor module is a CPU controller, the CPU controller in the embodiment can adopt CPU models with high cost performance such as an STM system single chip microcomputer and a Cortex-M series ARM core processor, as shown in figure 4, the CPU controller in the embodiment is provided with a clock, reset and storage, and further comprises a USB (universal serial bus), a timer, a GPIO (general purpose input/output) and a debugging serial port.
The CPU controller outputs square wave signals, the square wave signals are isolated, driven and rectified by the protection circuit and then converted into direct current signals to control a power supply of the digital output switch circuit, wherein the protection circuit is connected with the digital output switch circuit through a switch K, and the digital output switch circuit is controlled to be switched on and off by controlling the on and off of the switch K.
Specifically, the digital output switch circuit is connected with external equipment to control the output of an operation signal, namely, the on, off and consumption of the external equipment are controlled; the self-test circuit detects the state of the switching device of the output switching circuit and inputs the result to the processor module.
Specifically, the digital output switch circuit comprises two switch devices S1 and S2 connected in series and isolated digital driving signals DO and DI, the switch devices are relays, the CPU controller outputs two paths of the isolated digital driving signals DO and then respectively controls the two switch devices, and normally open contacts of the switch devices are connected in series to output and control external equipment.
Preferably, if any one electronic device has an open-circuit fault, the output of the external control signal is stopped, and meanwhile, the state of the relay is detected to be inconsistent with the expected state through the input of the digital driving signal DI of the normally closed contacts of the two relays, and then the hardware fault is determined;
if any relay has a contact short-circuit fault and the other relay connected in series is normal, the digital output switch circuit normally outputs an external control signal, and the state of the relay is detected to be inconsistent with an expected state through the input of the digital driving signal DI of the normally closed contacts of the two relays, so that the relay fault is judged.
Specifically, the CPU outputs two paths of digital quantity signals DO to control coils of two relays, and normally open contacts of the relays are connected in series to output to control external equipment. If the single relay has open circuit fault, the output of the external control signal is stopped, meanwhile, the state of the relay can be detected to be inconsistent with the expected state through the DI input of the normally closed contact of the relay, and the relay is judged to be faulty. Similarly, if a single relay has a contact short-circuit fault, the output is still normal because the second relay connected in series is normal, and the relay can be judged to have a fault through the detection loop. The probability of two relays failing simultaneously is very low and real-time detection for single relay failure exists, so that the probability can be ignored.
Besides the relay, other components in the output control circuit, such as a level conversion chip, an isolation optocoupler and the like, can find a fault and control the normal output state or the state of guiding to stop outputting based on a feedback loop if a single-way switch fails due to the fault.
As shown in fig. 3, the protection circuit includes two parallel and identical circuit branches one and two, a diode full-wave rectification unit and a harmonic filtering unit; one end of the first circuit branch and one end of the second circuit branch are connected with the CPU controller, and the other ends of the first circuit branch and the second circuit branch are connected with the diode full-wave rectification unit and the harmonic filtering unit in sequence. The circuit branch I and the circuit branch comprise an optical coupling isolation unit, a gate circuit shaping unit and an MOSFET unit which are connected in sequence; the CPU controller interrupts and outputs two paths of a first square wave and a second square wave which have the same frequency, 180-degree phase difference and 50-percent duty ratio through a timer, and the first square wave and the second square wave respectively enter a circuit branch circuit I and a circuit branch circuit II and then enter a diode full-wave rectification unit together for rectification and then are input to a harmonic filtering unit for filtering, and then direct current signals are output. The direct current signal controls a switch K in an output loop of the execution terminal, and external output can be enabled or cut off. In the design of the protection circuit, components and parts are formed in the protection circuit, no matter the optical coupler, the MOSFET, the rectifier diode, the resistor and the capacitor, the failure of the corresponding various modes only can cause the protection circuit to fail to output a direct current signal, and the switch K is cut off, namely, the output of an external control signal is stopped.
When the hardware fault occurs, software can detect the fault and sends fault information back to the control center through a wired network or a wireless network so as to be accessed and processed immediately, and the ordered work of the digital agricultural control system is ensured and is in a controlled state.
Software failures are handled as follows:
specifically, as shown in fig. 5, a method for protecting against failure of a digital agriculture executive terminal is applied to a system for protecting against failure of the digital agriculture executive terminal, and the method includes the following steps:
step 1: the CPU controller outputs two paths of square wave signals and controls the normal output work of the output management module through the protection circuit;
step 2: and when the CPU controller detects a software fault, the output of the square wave signal is automatically stopped, the power supply for the output management module is stopped, and the operation of the external equipment is controlled to be stopped.
The steps for detecting software faults in the step 2 are as follows:
step 2-1: when the software time sequence is abnormal, the software cannot clear the counting accumulated value in the timed interrupt function to zero, so that the counting accumulated value exceeds a set threshold value;
step 2-2: and when the timer interrupt service function detects that the calculated accumulated value exceeds a set threshold value, judging that the software fails and stopping the output of the square wave signal.
The principle of detecting software faults is as follows: the timer interrupt service function of the CPU processor sets the count accumulation logic of the interrupt times, when the software normally runs, the count value is cleared in each period, therefore, the count value can not exceed the maximum value corresponding to the software period; when the CPU processor has software time sequence abnormality due to internal hardware fault or software defect, the software cannot maintain the original cycle mode to operate, so that the accumulated counting value in the timing interrupt function cannot be cleared, the accumulated value exceeds a set threshold value, the timer interrupt service function detects the out-of-limit abnormality, and the output of square wave signals is stopped. Thus, controlled management in which the execution terminal stops outputting the external control signal when the software is abnormal is realized.
The invention adopts a special switch output execution circuit which is used for leading the output to be in a fixed state, namely stopping the output when a certain component in the circuit fails in various modes. The time of stopping output and the corresponding executed output quantity are synchronously recorded, so that the output of the whole digital control system can be controlled, the digital control system has a memory function, unfinished operation can be continuously executed after the fault is eliminated, the control of the whole crop environment and the control of crop elements are ensured to be closed-loop and complete, and the protection of hardware faults is realized.
And carrying out time sequence monitoring and management on software for controlling and executing terminal switching value output. When some fault exists in software or program execution is abnormal or flies due to external electromagnetic interference, the embodiment can monitor the process to find the abnormality and guide the switching value output to a fixed controllable state (stop), thereby realizing the protection of the software fault.
The hardware fault and the software abnormal state can be detected and transmitted to the control center in a network mode, so that the remote management of the digital system is realized, and the manual detection work is reduced.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (5)
1. The utility model provides a fault protection system of digital agriculture execution terminal which characterized in that, includes output management module, processor module and external communication module, wherein: the processor module is provided with preset operation information; the output management module is configured to automatically check hardware faults of the circuit and send fault information to the processor module; the processor module is configured to control the output management module to stop outputting signals after receiving the fault information so as to control the operation stopping information, synchronously record the output stopping time and the executed output quantity information before the stopping time, and feed back the output stopping signal and the executed output quantity information to the processor module for storage; after the fault is removed, the output management module reads preset operation information and executed output quantity information from the processor module and continues to execute unfinished operations; the unfinished operation is preset operation information except executed output quantity information;
the output management module comprises a digital output switch circuit, a protection circuit and an output self-checking circuit, wherein: the digital output switch circuit, the protection circuit and the output self-checking circuit are all connected with the processor module; the processor module outputs square wave signals, and the square wave signals are converted into direct current signals through the protection circuit to provide power for the digital output switching circuit; the digital output switch circuit controls the output of the operation signal; the self-checking circuit detects the state of a switching device of the output switching circuit and inputs the result to the processor module;
the processor module is a CPU controller, the digital output switch circuit comprises two switch devices connected in series and digital driving signals DO and DI after isolation, the CPU controller outputs two paths of digital driving signals DO and respectively controls the two switch devices after isolation, and normally open contacts of the switch devices are connected in series and output to control external equipment;
the switching device is a relay; if any one electronic device has an open-circuit fault, the digital output switch circuit stops outputting an external control signal, and meanwhile, the state of the relay can be detected to be inconsistent with an expected state through the input of digital driving signals DI of normally closed contacts of the two relays, and at the moment, the hardware fault is judged; if any relay has a contact short-circuit fault and a second relay connected in series is normal, the digital output switch circuit normally outputs an external control signal, and the state of the relay is detected to be inconsistent with an expected state through the input of a digital driving signal DI of normally closed contacts of the two relays, and the relay is judged to be a relay fault;
when the CPU controller detects that the software is in fault and the software timing sequence is abnormal, the software cannot clear the counting accumulated value in the timing interrupt function to zero, so that the counting accumulated value exceeds a set threshold value; and when the timer interrupt service function detects that the calculated accumulated value exceeds a set threshold value, judging that the software fails and stopping the output of the square wave signal.
2. The system of claim 1, wherein the external device is a digital agricultural executive terminal.
3. The fault protection system of the digital agriculture executive terminal as recited in claim 2, wherein the protection circuit comprises two parallel and identical circuit branch one and circuit branch two, a diode full wave rectification unit and a harmonic filtering unit; one end of the first circuit branch and one end of the second circuit branch are connected with the CPU controller, and the other ends of the first circuit branch and the second circuit branch are connected with the diode full-wave rectification unit and the harmonic filtering unit in sequence.
4. The fault protection system of the digital agriculture executive terminal as recited in claim 3, wherein the first circuit branch and the circuit branch comprise an optical coupling isolation unit, a gate circuit shaping unit and a MOSFET tube unit which are connected in sequence; the CPU controller interrupts and outputs two paths of a first square wave and a second square wave which have the same frequency, 180-degree phase difference and 50-percent duty ratio through a timer, and the first square wave and the second square wave respectively enter a circuit branch circuit I and a circuit branch circuit II and then enter a diode full-wave rectification unit together for rectification and then are input to a harmonic filtering unit for filtering, and then direct current signals are output.
5. A method for protecting against failure of a digital agricultural execution terminal, which applies the system for protecting against failure of a digital agricultural execution terminal according to any one of claims 1 to 4, the method comprising the following steps:
step 1: the CPU controller outputs two paths of square wave signals and controls the output work of the output management module through the protection circuit;
step 2: and when the CPU controller detects a software fault, automatically stopping the output of the square wave signal, stopping supplying power to the output management module, and further stopping the operation of the external equipment.
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| JP5058635B2 (en) * | 2007-03-12 | 2012-10-24 | 株式会社日立製作所 | Fail-safe output circuit with relay failure detection function and lighting output circuit for railway three-lamp color lamp traffic light |
| JP2016021730A (en) * | 2014-06-17 | 2016-02-04 | 東洋電機製造株式会社 | Failure detection circuit |
| CN106840689A (en) * | 2016-11-30 | 2017-06-13 | 广西壮族自治区都安瑶族自治县科学技术情报研究所 | A kind of self-checking system of farm tractor |
| CN107193270B (en) * | 2017-05-31 | 2024-01-23 | 北京广利核系统工程有限公司 | Digital quantity output channel self-diagnosis detection circuit, detection device and detection method |
| JP6913978B2 (en) * | 2018-04-25 | 2021-08-04 | 株式会社ナイルワークス | Fault detection systems, methods, and computer programs |
| CN109491304A (en) * | 2018-11-13 | 2019-03-19 | 上海中车汉格船舶与海洋工程有限公司 | A kind of control system automatic failure detection circuit and fault self-detection method |
| CN210016447U (en) * | 2019-03-21 | 2020-02-04 | 深圳市理邦精密仪器股份有限公司 | Protection circuit and medical equipment |
| CN110456688A (en) * | 2019-07-22 | 2019-11-15 | 北京交大微联科技有限公司 | Output control system, method, equipment and the vehicle of signal |
| CN213461544U (en) * | 2020-09-10 | 2021-06-15 | 青岛仪迪电子有限公司 | DC-DC isolation power supply circuit for high-precision power meter |
| CN112492956A (en) * | 2020-11-26 | 2021-03-16 | 江苏沃得植保机械有限公司 | Mower and automatic driving method thereof |
| CN112631256B (en) * | 2020-12-29 | 2022-03-18 | 浙江中控技术股份有限公司 | Switching value output module with safe function and diagnosis processing method |
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