A Wireless Gas Detection System and Method Based on WIA-PA Protocol

Abstract

The present invention relates to a wireless gas detection system and method based on the WIA-PA protocol, including a gas detection module, a controller module wirelessly connected to the gas detection module, and an intelligent monitoring platform. The gas detection module is installed on-site to detect the gas concentration within the controllable range in real time, and transmits the detected value to the controller module through the WIA-PA communication protocol network. A data microprocessor is installed in the controller module, and after receiving the detection signal, it is sent up to the intelligent monitoring platform. The mobile terminal can synchronously receive information without being restricted by geography and environment, and it is also convenient for on-site inspection. The measurement range of the gas detection module is 0%-100% LEL. The information transmission uses the WIA-PA communication protocol to support adaptive frequency modulation communication, ensuring the communication reliability in harsh environments. The blockchain technology is used as the storage method, which improves the utilization rate of existing hardware storage devices, can better protect data, and is convenient for data analysis and equipment life monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of gas monitoring, and particularly to a wireless gas detection system and method based on the WIA-PA protocol. Background Art

[0002] To ensure the personal safety and production safety in industries such as petrochemical, construction, fire protection, and water treatment, monitor the combustible gases and harmful gases leaked in the production process and storage and transportation facilities, and give alarms in time to prevent personal injuries and the occurrence of fires and explosions. According to the design specification requirements in newly built, renovated, and expanded projects, gas detection devices must be installed at the parts where gases are likely to leak.

[0003] Existing gas detection systems include wired transmission and wireless transmission according to the signal transmission form. Among them, the wired transmission gas detection system includes a controller, a detector, a monitoring platform, wiring, etc., and the wireless transmission gas detection system includes a detector with a sensor, a wireless controller, a communication network, a remote control platform, etc. The existing wireless transmission has the following problems: (1) The existing wireless communication uses the Zigbee protocol, and only realizes Mesh routing through a router, does not support end-to-end multi-path transmission, nor does it support the health detection of paths; (2) The Zigbee network does not support adaptive frequency modulation communication and cannot guarantee the communication reliability in harsh environments; (3) The existing communication protocol cannot meet the communication real-time performance, increasing the communication delay; (4) The existing network terminal devices have high energy consumption and must be powered by an external power supply. The traditional wired transmission has the following problems: (1) High construction costs, including labor costs, construction costs, communication optical cable costs, etc.; (2) Serious damage to the environment during the construction process; (3) The construction costs in remote areas such as mountains, deserts, and gobi increase significantly, and the personal safety cannot be guaranteed during the construction process; (4) Fixed monitoring points and high single-point costs: Traditional national control points need to build special houses and lay communication optical cables, with high initial construction costs and high later maintenance costs, making it difficult to carry out large-scale layout; (5) Incomplete data collection: Limited by costs, large-area and precise layout cannot be implemented, resulting in incomplete and inaccurate data collection; (6) Hidden data security risks: In traditional gas monitoring, data is usually not encrypted and integrity protected during the data transmission process from the sensor to the RTU and then to the monitoring platform, giving lawbreakers an opportunity.

[0004] Traditional gas monitoring systems are data acquisition systems that use wires and cables as the basic transmission medium. The currently commonly used solution is to deploy sensors at key positions to be monitored at the monitoring site, transmit the signals collected by each sensor through independent cables to the central acquisition station, and the central acquisition station centrally processes all the connected signals and sends them to the upper computer for real-time data acquisition. If the area to be monitored is large and many sensors are required, and the corresponding monitoring points are scattered, this traditional wired method will have problems such as complex line layout, cumbersome wiring, high installation cost, and high later cable maintenance cost. Due to the limitations of the wired gas monitoring system itself, network coverage and network support in many special environments are still a problem. For example, in some industrial sites, the use of cables is prohibited or restricted in some industrial environments, while in other industrial environments, the cables need to be completely shielded to highly prevent interference from machines or other radio control devices in most industrial facilities. Moreover, there are some high-speed rotating devices that simply cannot transmit data information through cables. This traditional serial centralized monitoring system greatly affects the processing speed, reliability, and flexibility of the system. Therefore, a wireless gas detection system and method based on the WIA-PA protocol is a problem that needs to be solved. Summary of the Invention

[0005] The present invention is proposed to solve the problems in the prior art. Its purpose is to provide a wireless gas detection system and method based on the WIA-PA protocol, which solves the problems of slow system processing speed and instability.

[0006] A wireless gas detection system based on the WIA-PA protocol includes a gas detection module, a controller module wirelessly connected to the gas detection module, and an intelligent monitoring platform. The gas detection module uses a number of wireless gas sensors to collect gas concentration. The wireless gas sensors are electrically connected to an analog-to-digital conversion circuit, and the analog-to-digital conversion circuit is electrically connected to a microprocessor. The microprocessor is provided with a WIA-PA transceiver unit for connecting to a WIA-PA router unit. The WIA-PA router unit is electrically connected to a control valve and a suction fan, and the WIA-PA router unit wirelessly transmits device management information and message forwarding information to the controller module. The WIA-PA router unit forms a self-organizing network and adapts to frequency modulation communication.

[0007] The controller module is internally provided with a data acquisition intelligent gateway. The data acquisition intelligent gateway is wirelessly connected to a WIA-PA router unit through a WIA-PA transceiver unit. The data acquisition intelligent gateway is also internally provided with a data microprocessor, which performs data edge computing analysis and data conversion. The data microprocessor is electrically connected to a POE switch unit, and the POE switch unit uses a POE industrial Ethernet switch. A digital display unit and a manual control unit are provided on the box panel outside the controller module for on-site adjustment and setting of the controller module parameters;

[0008] The data acquisition intelligent gateway is transmitted to the intelligent monitoring platform by wired or wireless means such as 4G / 5G network and fiber optic network. The intelligent monitoring platform uses an industrial Internet of Things platform, which is provided with big data analysis, SCADA control, and leakage alarm of a database, and an industrial isolation gateway is provided at the front end of the industrial Internet of Things platform for network security protection.

[0009] Preferably, the WIA-PA router unit uses a Mesh router with a WIA-PA network structure to connect multiple logically separated networks.

[0010] Preferably, the WIA-PA network structure adopts a two-layer network topology combining star and mesh, and adopts a TDMA transmission mode.

[0011] Preferably, a safety isolation circuit is connected between the wireless gas sensor and the analog-to-digital conversion circuit.

[0012] Preferably, the microprocessor in the gas detection module is electrically connected to a power supply module.

[0013] Preferably, the data acquisition intelligent gateway is electrically connected to a UPS power supply, and the UPS power supply is electrically connected to the commercial power or solar energy to supply power to the data acquisition intelligent gateway, WIA-PA router unit, POE switch unit, and digital display unit in the controller module.

[0014] A method for a wireless gas detection system based on the WIA-PA protocol includes the following steps:

[0015] 1) After the wireless gas sensor of the gas detection module detects gas, the information is transmitted to the WIA-PA router unit. The router unit is responsible for functions such as device management and message forwarding of the wireless gas sensor, and after information processing, it is sent to the controller module through the WIA-PA transceiver unit. The WIA-PA router unit completes the self-networking function between on-site devices and adapts to frequency modulation communication to ensure real-time seamless transmission of detection information;

[0016] 2) The WIA-PA router unit is used to connect multiple logically separated networks. A logical network represents a single network or a subnet. When data is transmitted from one subnet to another, it is completed through the WIA-PA router unit. The POE industrial Ethernet switch is mainly used for real-time Ethernet data transmission in complex industrial environments;

[0017] 3) The data acquisition intelligent gateway receives field device information, performs data edge computing analysis and data conversion through a data microprocessor. The WIA-PA transceiver unit adopts frequency modulation communication to receive information when there is line congestion or the network of individual field devices is unstable, and transmits it to the intelligent monitoring platform through wired or wireless methods such as 4G / 5G networks and fiber optic networks. The manual control unit is on the controller cabinet panel for emergency handling and setting controller parameters on-site;

[0018] 4) The industrial Internet of Things platform is connected to the data acquisition intelligent gateway through Ethernet, and sends data acquisition commands to the data acquisition intelligent gateway, which are sent down through the MQTT protocol;

[0019] 5) When the data acquisition intelligent gateway receives this command, it will communicate with wireless gas sensors, control valves, and exhaust fans through the WIA-PA router unit, and transfer various types of messages such as network messages, data messages, and health messages to the data acquisition intelligent gateway. First, it quickly establishes the WIA-PA network topology relationship according to the network message, and then receives the specific data message, disassembles the data message header to distinguish various communication protocols, and parses various protocols including modbus (WIA-PA) protocol, hart (WIA-PA) protocol, dlt (WIA-PA) protocol, AI (WIA-PA) protocol, DI (WIA-PA) protocol, PI (WIA-PA) protocol, etc.;

[0020] 6) The data acquisition intelligent gateway converts the content obtained after parsing the protocol into the MQTT protocol and uploads the data according to the instructions of the industrial Internet of Things platform;

[0021] 7) The industrial Internet of Things platform parses various types of data and stores them in the database. The big data analysis module further processes the data stored in the database.

[0022] The present invention has the following beneficial effects:

[0023] The designed wireless gas detection system based on the WIA-PA protocol has the following features: 1) Low power consumption: The power consumption is low, and the battery life is significantly extended under a limited battery. 2) Low cost: The cost of the communication module is greatly reduced, thereby reducing the construction cost of the micro-station. 3) Flexible networking: The entire system achieves self-networking capabilities through WIA-PA technology network devices, fully meeting the requirements of Internet of Things technology, eliminating the work of on-site device replacement debugging and device information pairing with the monitoring platform. 4) Reliability: The WIA-PA network adopts Mesh routing technology, supports redundant paths, ensures network reliability, supports health detection of paths, can achieve adaptive frequency hopping communication, and the signal will not be interrupted. 5) Real-time performance: The WIA-PA network adopts the TDMA mode, ensuring strong real-time performance of communication and shortening the communication delay;

[0024] The designed wireless gas detection system eliminates the need for laying optical cables at the monitoring points and reduces other supporting facilities, significantly reducing the overall construction cost. The monitoring layout is flexible and not restricted by optical cable laying. It can be deployed in remote areas, mountainous areas, desert and Gobi areas, etc.;

[0025] The intelligent monitoring cloud platform manages and controls the status of various monitoring devices, stores the collected data of the monitoring devices, improves the real-time performance and sensitivity of gas monitoring in industries such as oil and petrochemical, construction, industry, environment, and fire protection, and minimizes industry risks and improves the prediction ability. Description of the Drawings

[0026] Figure 1 It is the process schematic diagram of the wireless gas detection system based on the WIA-PA protocol.

[0027] Figure 2 It is the structural flowchart of the gas detection module.

[0028] Figure 3 It is the data message example diagram. Detailed Embodiments

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] The embodiments of the present invention are described with reference to Figure 1-2, a wireless gas detection system based on the WIA-PA protocol, includes a gas detection module, a controller module wirelessly connected to the gas detection module, and an intelligent monitoring platform. The gas detection module uses a number of wireless gas sensors to collect gas concentration. The wireless gas sensors are electrically connected to an analog-to-digital conversion circuit. A safety isolation circuit is connected between the wireless gas sensors and the analog-to-digital conversion circuit. The analog-to-digital conversion circuit is electrically connected to a microprocessor. A WIA-PA transceiver unit is provided in the microprocessor for connecting to a WIA-PA router unit. The WIA-PA router unit is electrically connected to a control valve and a suction fan, and is used for the WIA-PA router unit to wirelessly transmit device management information and message forwarding information to the controller module. The WIA-PA router unit self-organizes a network and adapts to frequency modulation communication. The microprocessor in the gas detection module is electrically connected to a power supply module.

[0031] A data acquisition intelligent gateway is provided inside the controller module. The data acquisition intelligent gateway is wirelessly connected to the WIA-PA router unit through a WIA-PA transceiver unit provided. The WIA-PA router unit of the controller module is electrically connected to a patrol PAD for patrolling network nodes. After a problematic network is found, the network problem is automatically self-organized and adaptively frequency-modulated for processing. A data microprocessor is also provided in the data acquisition intelligent gateway. The data microprocessor performs data edge computing analysis and data conversion. The data microprocessor is electrically connected to a POE switch unit. The POE switch unit uses a POE industrial Ethernet switch. A digital display unit and a manual control unit are provided on the box panel outside the controller module for on-site adjustment and setting of the controller module parameters.

[0032] The data acquisition intelligent gateway is transmitted to the intelligent monitoring platform by wired or wireless means such as 4G / 5G network and fiber optic network. The intelligent monitoring platform uses an industrial Internet of Things platform. The industrial Internet of Things platform is provided with big data analysis, SCADA control, and leakage alarm in the database, and an industrial isolation gateway is provided at the front end of the industrial Internet of Things platform for network security protection.

[0033] The WIA-PA router unit uses a Mesh router with a WIA-PA network structure to connect multiple logically separated networks. The WIA-PA network structure adopts a two-layer network topology combining star and mesh, and uses the TDMA transmission mode. The first layer is a star structure, composed of routing devices and field devices or handheld devices. The routing device undertakes the function of the cluster head, playing the role of self-organizing the Internet of Things data and frequency hopping detection. The field device or handheld device undertakes gas detection and monitoring and debugging of device operation data. The data acquisition intelligent gateway is electrically connected to a UPS power supply. The UPS power supply is electrically connected to the mains or in the form of solar and wind energy complementary for supplying power to the data acquisition intelligent gateway, WIA-PA router unit, POE switch unit, and digital display unit in the controller module.

[0034] This system consists of a detector (an alarm can be optionally configured), a controller, a communication network, a monitoring platform, an intelligent monitoring platform, a mobile terminal, and network security devices. The detector is installed on-site to detect the gas concentration within the controllable range in real time, and transmits the detected value to the controller through the WIA-PA communication protocol network. A dedicated data microprocessor is installed in the controller. After receiving the detection signal, it is sent up to the intelligent monitoring platform and the Zhiyun management platform. The mobile terminal can receive information synchronously without being restricted by region and environment, and is also convenient for on-site inspections. The measuring range of the detector is 0%-100% LEL. The information transmission uses the WIA-PA communication protocol to support adaptive frequency modulation communication, ensuring the communication reliability in harsh environments. The blockchain technology is used as the storage method, which improves the utilization rate of existing hardware storage devices, greatly reduces the investment in storage hardware devices, and can better protect data, facilitating data analysis and equipment life monitoring.

[0035] A method for a wireless gas detection system based on the WIA-PA protocol includes the following steps:

[0036] 1) After the wireless gas sensor of the gas detection module detects the gas, the information is transmitted to the WIA-PA router unit. The router unit is responsible for functions such as device management and message forwarding of the wireless gas sensor. After information processing, it is sent to the controller module through the WIA-PA transceiver unit. The WIA-PA router unit completes the self-networking function between on-site devices and performs adaptive frequency modulation communication to ensure real-time seamless transmission of detection information;

[0037] 2) The WIA-PA router unit is used to connect multiple logically separated networks. A logical network represents a single network or a subnet. When data is transmitted from one subnet to another, it is completed through the WIA-PA router unit. The POE industrial Ethernet switch is mainly used for real-time Ethernet data transmission in complex industrial environments. When Ethernet was designed, due to its use of the Carrier Sense Multiple Access with Collision Detection (CSMA / CD mechanism), its reliability is greatly reduced when applied in complex industrial environments, resulting in the inability to use Ethernet. The POE industrial Ethernet switch uses the store-and-forward switching method, improves the Ethernet communication speed at the same time, and has an intelligent alarm design built-in to monitor the network operation status;

[0038] 3) The data acquisition intelligent gateway receives on-site device information, performs data edge computing analysis and data conversion through the data microprocessor. The WIA-PA transceiver unit uses frequency modulation communication to receive information when the line is congested or the network of individual on-site devices is unstable, and transmits it to the intelligent monitoring platform through wired or wireless methods such as 4G / 5G networks and fiber optic networks. The manual control unit is on the controller cabinet panel for emergency handling and setting controller parameters on-site;

[0039] 4) The industrial Internet of Things platform is connected to the data acquisition intelligent gateway through Ethernet, and sends data acquisition commands to the data acquisition intelligent gateway, which are sent down through the MQTT protocol.

[0040] 5) When the data acquisition intelligent gateway receives the command, it will communicate with the wireless gas sensor, control valve and exhaust fan through the WIA-PA router unit, and transfer various types of messages such as network messages, data messages, and health messages to the data acquisition intelligent gateway. First, it quickly establishes the WIA-PA network topology relationship according to the network message. An example of network message parsing is shown in the following table:

[0041]

[0042]

[0043] After that, it receives the specific data message, disassembles the data message header to distinguish various communication protocols, and parses various protocols including modbus (WIA-PA) protocol, hart (WIA-PA) protocol, dlt (WIA-PA) protocol, AI (WIA-PA) protocol, DI (WIA-PA) protocol, PI (WIA-PA) protocol, etc. An example of the data message is shown as Figure 3 shown.

[0044] 6) The data acquisition intelligent gateway converts the content obtained after parsing the protocol into the MQTT protocol and returns the data according to the instructions of the industrial Internet of Things platform.

[0045] 7) The industrial Internet of Things platform parses the protocols of various types of data and stores them in the database. The big data analysis module further processes the data stored in the database.

[0046] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0047] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wireless gas detection system based on the WIA-PA protocol, characterized in that, it includes a gas detection module, a controller module wirelessly connected to the gas detection module, and an intelligent monitoring platform. The gas detection module uses a number of wireless gas sensors to collect gas concentration. The wireless gas sensors are electrically connected to an analog-to-digital conversion circuit, and the analog-to-digital conversion circuit is electrically connected to a microprocessor. A WIA-PA transceiver unit is provided in the microprocessor for connecting to a WIA-PA router unit. The WIA-PA router unit is electrically connected to a control valve and a suction fan, and is used for the WIA-PA router unit to wirelessly transmit device management information and message forwarding information to the controller module. The WIA-PA router unit self-organizes a network and adaptively adjusts the frequency for communication; A data acquisition intelligent gateway is provided inside the controller module. The data acquisition intelligent gateway is wirelessly connected to the WIA-PA router unit through a WIA-PA transceiver unit provided. A data microprocessor is also provided in the data acquisition intelligent gateway. The data microprocessor performs data edge computing analysis and data conversion. The data microprocessor is electrically connected to a POE switch unit. The POE switch unit uses a POE industrial Ethernet switch. A digital display unit and a manual control unit are provided on the box panel outside the controller module for on-site adjustment and setting of the controller module parameters; The data acquisition intelligent gateway is transmitted to the intelligent monitoring platform by wired or wireless means such as 4G / 5G network and fiber optic network. The intelligent monitoring platform uses an industrial Internet of Things platform. The industrial Internet of Things platform is provided with big data analysis, SCADA control, and leakage alarm in a database, and an industrial isolation gateway is provided at the front end of the industrial Internet of Things platform for network security protection; A safety isolation circuit is connected between the wireless gas sensor and the analog-to-digital conversion circuit; The microprocessor in the gas detection module is electrically connected to a power supply module; The data acquisition intelligent gateway is electrically connected to a UPS power supply, and the UPS power supply is electrically connected to the commercial power or solar energy for supplying power to the data acquisition intelligent gateway, WIA-PA router unit, POE switch unit, and digital display unit in the controller module.

2. The wireless gas detection system based on the WIA-PA protocol according to claim 1, characterized in that, the WIA-PA router unit uses a Mesh router with a WIA-PA network structure to connect multiple logically separated networks.

3. The wireless gas detection system based on the WIA-PA protocol according to claim 2, characterized in that, the WIA-PA network structure adopts a two-layer network topology combining star and mesh, and adopts a TDMA transmission mode.

4. The method of the wireless gas detection system based on the WIA-PA protocol according to any one of claims 1-3, characterized in that, it includes the following steps: 1) After the wireless gas sensor of the gas detection module detects gas, the information is transmitted to the WIA-PA router unit. The router unit is responsible for functions such as device management and message forwarding of the wireless gas sensor. After information processing, it is sent to the controller module through the WIA-PA transceiver unit. The WIA-PA router unit completes the self-organizing network function between field devices and communicates with adaptive frequency modulation to ensure real-time seamless transmission of detection information; 2) The WIA-PA router unit is used to connect multiple logically separated networks. A logical network represents a single network or a subnet. When data is transmitted from one subnet to another, it is completed through the WIA-PA router unit. The POE industrial Ethernet switch is mainly used for real-time Ethernet data transmission in complex industrial environments; 3) The data acquisition intelligent gateway receives field device information, performs data edge computing analysis and data conversion through the data microprocessor. The WIA-PA transceiver unit uses frequency modulation communication to receive information when there is line congestion or the network of individual field devices is unstable, and transmits it to the intelligent monitoring platform in a wired or wireless manner through 4G / 5G networks and fiber optic networks. The manual control unit is on the controller cabinet panel to set controller parameters for emergency handling and on-site adjustment; 4) The industrial Internet of Things platform is connected to the data acquisition intelligent gateway through Ethernet and sends data acquisition commands to the data acquisition intelligent gateway in the form of the MQTT protocol; 5) When the data acquisition intelligent gateway receives this command, it will communicate with the wireless gas sensor, control valve, and exhaust fan through the WIA-PA router unit, and transfer various types of messages such as network messages, data messages, and health messages to the data acquisition intelligent gateway. First, it quickly establishes the WIA-PA network topology relationship based on the network message, and then receives the specific data message, disassembles the data message header to distinguish various communication protocols, and parses various protocols including the modbus (WIA-PA) protocol, hart (WIA-PA) protocol, dlt (WIA-PA) protocol, AI (WIA-PA) protocol, DI (WIA-PA) protocol, PI (WIA-PA) protocol, etc.; 6) The data acquisition intelligent gateway converts the content obtained after protocol parsing into the MQTT protocol and returns the data according to the instructions of the industrial Internet of Things platform; 7) The industrial Internet of Things platform parses various types of data and stores them in the database. The big data analysis module further processes the data stored in the database.

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