Industrial gas system data interaction control method based on public LCU

Abstract

The invention relates to the technical field of industrial gas system data processing, and discloses an industrial gas system data interaction control method based on a public LCU, and the method comprises the following steps: S1, constructing a database; s2, processing a transmission format: respectively processing the real-time data and the periodic data, wherein the real-time data needs a large amount of digital quantity and has a relatively high requirement on the real-time performance; step S3, data acquisition: different parameters are measured by different sensors, and various real-time data and periodic data of the industrial gas system are obtained; s4, data transmission: the periodic data are directly transmitted to a public LCU module through a CAN bus; and S5, data processing: after receiving the data, the public LCU module calls a local or remote algorithm to analyze and process the data according to the requirements of different algorithms, and after processing is completed, a result is sent to the local LCU module through the CAN bus. According to the invention, efficient transmission and processing of data in an industrial gas system are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial gas system data processing, and specifically relates to a data interaction control method for an industrial gas system based on a common LCU. Background Art

[0002] Currently, in an industrial gas system, in order to ensure the safe operation of unit equipment, it is necessary to collect and analyze various parameters and other data of the unit, and perform equipment control based on the collected data. With the continuous improvement of the requirements for industrial gas safety and reliability, the control system needs to interact and transfer the data collected by different sensors.

[0003] Traditional industrial field equipment control and data transfer are both completed independently by the PLC system. Industrial Ethernet applications based on the Modbus protocol are also widely used in industrial scenarios. The above methods have many disadvantages:

[0004] 1. Design independent software and hardware configuration systems for different application scenarios, with a long development cycle and high maintenance costs. Since each on-site environment is different and different on-sites require different control systems, independent design and development can only be carried out for each on-site, increasing the design cost and maintenance difficulty;

[0005] 2. Due to the increase in data volume, the control system also needs to be frequently upgraded to meet on-site requirements, increasing the design cost and maintenance cost;

[0006] 3. In each control system, the sensors and controlled objects are different, the data formats vary greatly, data intercommunication between systems cannot be achieved, and the control modes of different control systems are also different, so control commands cannot be sent to each other between systems;

[0007] 4. The control system requires a dedicated processor for algorithm operations, increasing the system cost.

[0008] In view of this, the present invention is specifically proposed. Summary of the Invention

[0009] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0010] A data interaction control method for an industrial gas system based on a common LCU, comprising the following steps:

[0011] S1. Construct a database: Divide all data in the industrial gas system into common data and private data. The same protocol is used for different data, and the data is classified. The common data is collected and processed by the common LCU, and the private data is processed by the local LCU;

[0012] S2. Transmission format processing: Process real-time data and periodic data separately. Since a large amount of digital data is required in real-time data and high real-time performance is required, convert the real-time data into a data frame of a unified format and perform verification through exclusive OR operation;

[0013] S3. Data acquisition: Measure different parameters by different sensors to obtain various real-time data and periodic data of the industrial gas system;

[0014] S4. Data transmission: The periodic data is directly transmitted to the public LCU module through the CAN bus. After the real-time data is calculated by the general LCU module, it is then transmitted to the public LCU module through the CAN bus;

[0015] S5. Data processing: After receiving the data, the public LCU module calls local or remote algorithms to analyze and process the data according to the needs of different algorithms. After the processing is completed, the results are sent to the local LCU module through the CAN bus.

[0016] As a preferred embodiment of the present invention, in step S1, the specific process of constructing the database is as follows: Divide all the data in the industrial gas system according to the control subject into system data, unit data, process data, environment data, and valve data. Among them, the data that is concurrent between the system public LCU and the private LCU is divided into independent data groups, and the data belonging to the common part is defined as the public LCU data group. The public LCU collects and processes the public LCU data group, and the data that belongs to one or more types of public LCU and local LCU fusion is divided into common data groups. The shared LCU and the local LCU jointly collect and process the common data groups.

[0017] As a preferred embodiment of the present invention, in step S2, the transmission format processing of the real-time data is specifically as follows: According to the algorithm requirements, convert the real-time data obtained by different sensors into a data frame of a unified format. All data frames have the same length and are composed of a frame header, a frame address, frame data, and a frame checksum. The frame header is 7-bit 1100111, the frame address is 2-bit octal address information, the frame data is 15-bit hexadecimal data information, and the frame checksum is obtained by exclusive OR operation of the frame header and the frame data. The frame header identifies the start bit, the frame address identifies the identity of the component sending the data, the frame data is the data information to be sent, and the frame checksum serves as the exclusive OR check bit.

[0018] As a preferred embodiment of the present invention, in step S2, the communication protocol processing is specifically as follows: before data transmission, one bit of 0 is added after the transmission data frame header and in the middle of the data frame. According to the principle of exclusive OR check, when the check bit appears as 1 after data transmission, it indicates that the entire data transmission process is normal and there is no data abnormality or other error in the data frame. If the check bit appears as 0, it indicates that there may be a data error in the data frame, and all data in the data frame needs to be retransmitted.

[0019] As a preferred embodiment of the present invention, in step S3, the data acquisition step is specifically as follows: data acquisition is obtained by different sensors. The selection of sensors needs to be screened according to the category of measured parameters. The parameters to be measured are pressure, temperature, flow rate, rotational speed, and liquid level. Among them, pressure is obtained by the sensor converting the pressure signal into a voltage signal and outputting it. After being converted from analog to digital through an analog-to-digital conversion, it is sampled by the AD conversion module. Temperature directly outputs a 4 - 20ma analog quantity through the temperature sensor and is obtained after ADC conversion; rotational speed is measured by the rotational speed sensor, and liquid level is measured by the liquid level sensor; the screening process of the flow sensor is as follows: the gas flow rate in the industrial gas system needs to be selected according to the unit or system state. For the gas supply pipe group, the gas flow rate does not need to be known during unit startup and shutdown, and a mechanical flowmeter is selected; while during normal operation or low-speed operation of the unit, it is necessary to know the gas flow rate and the actual pressure of the pipe group in real time. At this time, a gas flow sensor needs to be selected according to the unit state. The flow sensor needs to be selected according to the pipe diameter size, and different pipe diameters correspond to different types of flow sensors;

[0020] For the fuel pipe group, since the fuel is always in a combustion state, a corresponding flow sensor needs to be selected according to the pipe diameter size.

[0021] As a preferred embodiment of the present invention, in step S5, the data transmission process is specifically as follows:

[0022] A: Data transmission is divided into real-time data transmission and periodic data transmission. Among them, real-time data transmission is controlled and started by the general LCU module. Periodic data transmission does not require control by the controller and is jointly completed by the public LCU module and the local LCU module. Among them, periodic transmission data is sent to the public LCU and the local LCU in real time to ensure that the initial data collected by the sensor can be obtained by the public LCU and the local LCU. The public LCU module and the local LCU module judge according to the initial data. If it belongs to the public data group, the public LCU will directly send the received data to the public LCU. If it belongs to the common data group, the public LCU module will send the data to the local LCU module, and the local LCU module will perform control calculations. After the calculation is completed, the calculation result will be sent to the public LCU module for processing;

[0023] B: The common LCU module sends periodic data and data instructions to the local LCU module via the CAN bus. The periodic data is used to keep the information synchronization between the common LCU module and the local LCU module, and the data instructions are used to obtain the calculation data in the local LCU module. The local LCU module makes data judgments based on the data instructions and the periodic data. If it belongs to the private data group, the local LCU module processes the data and does not send it to the common LCU module; if it belongs to the common data group, the local LCU module processes the data and sends the result to the common LCU module.

[0024] As a preferred embodiment of the present invention, the process of step S6 includes: S61, determining that the industrial gas system is in an unstable state; S62, performing data interaction of the industrial gas system in an asynchronous control mode to obtain the coupling coefficient and the overall coupling coefficient of the industrial gas system; S63, obtaining the influence probability of the coupling coefficient during the system state transition process according to the system state transition process; S64, allocating corresponding module data storage and processing resources according to the coupling coefficient and the influence probability; S65, interacting and storing the data and instructions of each cooperation group according to the asynchronous control strategy; S66, performing target scenario data modeling according to the asynchronous control strategy.

[0025] As a preferred embodiment of the present invention, in step S4, CAN bus communication protocol is adopted for data transmission. This transmission protocol includes two main parts: namely, data frame format definition and hardware circuit design. The data frame format design: In the data frame format design, data is divided into periodic data and real-time data. In terms of the transmission format, since periodic data is transmitted in real time, there is no need to identify the frame header and frame tail for the data, and only data verification is required. However, since data processing needs to be completed before the transmission of real-time data, frame header and frame tail need to be added during the transmission of real-time data to confirm the position of the data and prevent data confusion and errors during the data processing process. The specific content of the periodic data transmission protocol is as follows: First, frame header: The frame header is used to confirm the start of the data. In the periodic data frame, the frame header indicates that the data in this frame format is in the periodic data transmission format. Second, the data length of the periodic data transmission protocol: It is 10 bits, which is the number of bytes of data included in the periodic data frame. Third, data content: 1 byte, which is the data measured by the sensor in the current period and includes the time stamp T1. Fourth, data verification: It is the exclusive OR result of the data and the frame header, mainly to prevent data errors in the transmitted frame and ensure the correct and reliable transmission of the data. The data length of the real-time data transmission protocol is greater than that of the periodic data, and the data length is designed to be 10 bits. The specific content of the frame format design is as follows: First, frame header: The frame header is used to confirm the start of the data. In the real-time data frame, the frame header indicates that the data in this frame format is in the real-time data transmission format. Second, the data length of the real-time data transmission protocol: It is 10 bits, which is the number of bytes of data included in the real-time data frame. Third, data content: 2 bytes, representing the result T2 calculated by the local LCU, which is the exclusive OR result of each byte in the sensor measurement data frame included in the real-time data frame to prevent data transmission failures. Fourth, data verification: It is the exclusive OR result of the data and the frame header, mainly to prevent data errors in the transmitted frame and ensure the correct and reliable transmission of the data. The hardware circuit design: The communication hardware circuit design mainly includes CAN bus and a controller. The CAN bus includes a CAN bus controller and a CAN transceiver. Their connection relationship is that the CAN bus controller is connected to the CPU, and the CAN transceiver is connected to the CAN bus controller. The connection method is usually a serial connection method. The CAN transceiver includes CANH and CANL. During the connection, CANH and CANL need to use a connector with shielding function to prevent external signal interference from affecting the operation of the CAN bus. When connecting CANH and CANL, they are first optically isolated and then connected to the CPU. The CAN bus controller and the processor CPU can be connected through the IO port. In the actual control system, 4 IO ports are often used for connection. The CAN bus controller needs to be connected to the CAN transceiver, and the CAN transceiver needs to be connected to the CAN bus. Through the above hardware connection, the reliability of the CAN bus data is ensured.

[0026] As a preferred embodiment of the present invention, in step S5, the data processing is specifically as follows: after receiving the data, the common LCU module calls local or remote algorithms according to the needs of different algorithms to analyze and process the data, performs algorithm processing through the common LCU module or the local LCU module, and at the same time sends the result to the local LCU module through the CAN bus, and reserves some interfaces for different algorithms to ensure the free update of the algorithms.

[0027] The present invention has the following beneficial effects compared with the prior art:

[0028] The present invention classifies and processes the data of the common LCU and different sensors through the CAN bus, selects the appropriate data frame format according to the size of the data volume and system requirements, divides the data into a common data group and a private data group according to the data category, and at the same time reserves an algorithm interface to improve the control efficiency and stability of the system; at the same time, data transmission is carried out between the shared LCU and the private LCU to ensure the reliability of the system.

[0029] Compared with the traditional communication method, the present invention can effectively classify and process the data and forward it by classification, and has the advantages of fast data interaction speed and safety and reliability.

[0030] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. Description of the Drawings

[0031] In the drawings:

[0032] Figure 1 It is a schematic diagram of the overall process of a data interaction control method for an industrial gas system based on a common LCU. Specific Embodiments

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0034] A data interaction control method for an industrial gas system based on a common LCU proposed in this embodiment includes the following steps:

[0035] S1. Build a database: divide all the data in the industrial gas system into common data and private data, use the same protocol for different data, classify the data, collect and process the common data using a common LCU, and use a local LCU for private data;

[0036] Among them, the specific process of building the database is as follows: all the data in the industrial gas system are divided according to the control subject into system data, unit data, process data, environmental data, and valve data. Among them, the data that is concurrent between the public LCU and the private LCU of the system class is divided into independent data groups. Among them, the data belonging to the common part is defined as the public LCU data group, and the public LCU collects and processes the public LCU data group. And the data that is the fusion of a certain type or multiple types of public LCU and local LCU is divided into common data groups, and the shared LCU and the local LCU jointly collect and process the common data groups;

[0037] S2. Transmission format processing: Process the real-time data and periodic data separately. Since a large amount of digital quantities are required in the real-time data and high requirements for real-time performance, convert the real-time data into data frames in a unified format and perform verification through exclusive OR operation;

[0038] S3. Data acquisition: Measure different parameters by different sensors to obtain various real-time data and periodic data of the industrial gas system;

[0039] Among them, the specific steps of the data acquisition are as follows: The data acquisition is obtained by different sensors. The selection of sensors needs to be screened according to the type of measured parameters. The parameters to be measured are pressure, temperature, flow rate, rotational speed, and liquid level. Among them, the pressure is obtained by the sensor converting the pressure signal into a voltage signal output. After converting the analog quantity into a digital quantity, it is sampled through the AD conversion module. The temperature directly outputs a 4-20ma analog quantity through the temperature sensor and is obtained after ADC conversion; The rotational speed is measured by the rotational speed sensor, and the liquid level is measured by the liquid level sensor;

[0040] Among them, the screening process of the flow sensor is as follows:

[0041] The gas flow rate in the industrial gas system needs to be selected according to the unit or system state. For the gas supply pipe group, the gas flow rate does not need to be known during the start and stop of the unit, and a mechanical flowmeter is selected; while during the normal operation or low-speed operation of the unit, the gas flow rate and the actual pressure of the pipe group need to be known in real time. At this time, the gas flow sensor needs to be selected according to the unit state, and the flow sensor needs to be selected according to the pipe diameter size. Different pipe diameters correspond to different types of flow sensors. For the fuel pipe group, since the fuel is always in a combustion state, the corresponding flow sensor needs to be selected according to the pipe diameter size;

[0042] S4. Data transmission: The periodic data is directly transmitted to the public LCU module through the CAN bus. The real-time data is first calculated by the general LCU module and then transmitted to the public LCU module through the CAN bus;

[0043] Among them, the specific process of the data transmission is as follows:

[0044] A: Data transmission is divided into real-time data transmission and periodic data transmission. Among them, real-time data transmission is controlled and started by the general LCU module. Periodic data transmission does not require controller control and is jointly completed by the public LCU module and the local LCU module. Among them, periodic transmission data is sent to the public LCU and the local LCU in real time to ensure that the initial data collected by the sensor can be obtained by the public LCU and the local LCU. The public LCU module and the local LCU module make judgments based on the initial data. If it belongs to the public data group, the public LCU will directly send the received data to the public LCU. If it belongs to the common data group, the public LCU module will send the data to the local LCU module, and the local LCU module will perform control calculations. After the calculation is completed, the calculation result will be sent to the public LCU module for processing;

[0045] B: The public LCU module sends periodic data and data instructions to the local LCU module through the CAN bus. Periodic data is used to keep the information synchronization between the public LCU module and the local LCU module, and data instructions are used to obtain the calculation data in the local LCU module. The local LCU module makes data judgments based on the data instructions and periodic data. If it belongs to the private data group, the local LCU module processes the data and does not send it to the public LCU module; if it belongs to the common data group, the local LCU module processes the data and sends the result to the public LCU module;

[0046] S5. Data processing: After receiving the data, the public LCU module calls local or remote algorithms to analyze and process the data according to the needs of different algorithms. After the processing is completed, the result is sent to the local LCU module through the CAN bus;

[0047] Among them, the data transmission adopts the CAN bus communication protocol, and this transmission protocol includes two main parts: namely, the definition of the data frame format and the design of the hardware circuit;

[0048] The design of the data frame format: In the design of the data frame format, the data is divided into periodic data and real-time data. In the transmission format, since the periodic data is transmitted in real time, there is no need to identify the frame header and frame tail of the data, and only the data needs to be verified; however, since the data processing work needs to be completed before the real-time data is transmitted, the frame header and frame tail need to be added during the real-time data transmission to confirm the position of the data, preventing the data from being confused during the data processing process and resulting in data errors.

[0049] The specific content of the periodic data transmission protocol is as follows:

[0050] I. Frame header: The frame header is used to confirm the start of the data. In the periodic data frame, the frame header indicates that the data in this frame format is in the periodic data transmission format;

[0051] II. Periodic Data Transmission Protocol Data Length: 10 bits, which is the number of bytes of data contained in the periodic data frame;

[0052] III. Data Content: 1 byte, which is the data measured by the sensor in the current period and contains the timestamp T1;

[0053] IV. Data Verification: It is the exclusive OR result of the data and the frame header. The main purpose is to prevent data errors in the transmitted frame and ensure the correct and reliable transmission of the data;

[0054] The data length of the real-time data transmission protocol is greater than that of the periodic data. The data length is designed to be 10 bits. The specific content of the frame format design is as follows:

[0055] I. Frame Header: The frame header is used to confirm the start of the data. In the real-time data frame, the frame header indicates that the data in this frame format is in the real-time data transmission format;

[0056] II. Real-time Data Transmission Protocol Data Length: 10 bits, which is the number of bytes of data contained in the real-time data frame;

[0057] III. Data Content: 2 bytes, representing the result T2 calculated by the local LCU, which is the exclusive OR result of each byte in the sensor measurement data frame contained in the real-time data frame to prevent data transmission failures;

[0058] IV. Data Verification: It is the exclusive OR result of the data and the frame header. The main purpose is to prevent data errors in the transmitted frame and ensure the correct and reliable transmission of the data;

[0059] The design of the hardware circuit: The design of the communication hardware circuit mainly includes the CAN bus and the controller. The CAN bus includes a CAN bus controller and a CAN transceiver. Their connection relationship is that the CAN bus controller is connected to the CPU, and the CAN transceiver is connected to the CAN bus controller. The connection method is usually a serial connection method. The CAN transceiver includes CANH and CANL. When connecting CANH and CANL, a connector with shielding effect needs to be used to prevent external signal interference from affecting the operation of the CAN bus. When connecting CANH and CANL, they are first optically isolated and then connected to the CPU; The CAN bus controller and the processor CPU can be connected through the IO port. In the actual control system, 4 IO ports are often used for connection. The CAN bus controller needs to be connected to the CAN transceiver, and the CAN transceiver needs to be connected to the CAN bus. Through the above hardware connection, the reliability of the CAN bus data is ensured;

[0060] Among them, the communication protocol processing is specifically as follows: Before data transmission, add a bit 0 after the transmission data frame header and in the middle of the data frame. According to the principle of exclusive OR check, if the check bit appears as 1 after data transmission, it indicates that the entire data transmission process is normal and there is no data anomaly or other error in the data frame. If the check bit appears as 0, it indicates that there may be a data error in the data frame, and all data in the data frame needs to be retransmitted.

[0061] Among them, the data processing is specifically as follows: After receiving the data, the common LCU module calls local or remote algorithms according to the needs of different algorithms to analyze and process the data. The algorithm processing is carried out through the general LCU module or the local LCU module, and at the same time, the result is sent to the local LCU module through the CAN bus, and some interfaces are reserved for different algorithms to ensure the free update of the algorithms.

[0062] The specific usage method and working process of this embodiment:

[0063] In this embodiment, through database construction, transmission format processing, data acquisition, data transmission, and data processing, the fusion calculation of common data by the common LCU and the local LCU can be realized, and the private data is only processed by the local LCU, which greatly reduces the data processing volume of the common LCU and at the same time reduces the redundancy of the local LCU module. In the database design, in order to ensure the generality of the general LCU, all data is divided into four major categories and a total of nine groups. During the calculation process, the general LCU module only needs to obtain the common data group and the common data group among them to complete the calculation, which greatly reduces the calculation volume of the general LCU and at the same time meets the real-time requirement of the data, ensuring the accuracy and security of the common part calculation.

[0064] For the local LCU module, through protocol conversion and data communication, the coordinated work with other LCU modules is ensured, and different flow selections can be made through different states to meet different performance indicators of the unit at different stages; for the general LCU module, the CAN bus protocol is adopted. In the data frame format design, the data is divided into periodic data and real-time data. In the transmission format, since the periodic data is transmitted in real time, there is no need to identify the frame header and frame tail of the data, and only the data needs to be checked. However, since the data processing work needs to be completed before the real-time data is transmitted, the frame header and frame tail need to be added during the real-time data transmission to confirm the position of the data, preventing data confusion and data errors during the data processing process. This greatly improves the data real-time performance of the CAN bus and ensures the accuracy of data transmission.

[0065] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention should cover within the protection scope of the present invention by making equivalent substitutions or changes according to the technical solution and inventive concept of the present invention.

Claims

1. A data interaction control method for an industrial gas system based on a common LCU, characterized in that It includes the following steps: S1. Construct a database: Divide all the data in the industrial gas system into public data and private data. Different types of data adopt the same protocol. Classify the data. The public data is collected and processed by the public LCU, and the private data is processed by the local LCU; S2. Transmission format processing: Process the real-time data and periodic data separately. Since a large amount of digital data is required in the real-time data and high real-time performance is required, convert the real-time data into a data frame of a unified format and perform verification through exclusive-OR operation; S3. Data acquisition: Measure different parameters by different sensors to obtain various real-time data and periodic data of the industrial gas system; S4. Data transmission: The periodic data is directly transmitted to the public LCU module through the CAN bus. The real-time data is first calculated by the general LCU module and then transmitted to the public LCU module through the CAN bus; S5. Data processing: After receiving the data, the public LCU module calls local or remote algorithms according to the needs of different algorithms to analyze and process the data. After the processing is completed, the results are sent to the local LCU module through the CAN bus.

2. The industrial gas system data interaction control method based on a common LCU according to claim 1, wherein In step S1, the specific process of constructing the database is as follows: Divide all the data in the industrial gas system according to the control entity into system data, unit data, process data, environment data, and valve data. The data in which the public LCU and private LCU of the system class concur is divided into independent data groups. The data belonging to the public part is defined as the public LCU data group, and the public LCU collects and processes the public LCU data group. The data in which one or more types of public LCU are integrated with the local LCU is divided into common data groups, and the common LCU and the local LCU jointly collect and process the common data groups.

3. A data interaction control method for an industrial gas system based on a common LCU according to claim 1, characterized in that, In step S2, the transmission format processing of the real-time data is specifically as follows: According to the algorithm requirements, convert the real-time data obtained by different sensors into data frames of a unified format. All data frames have the same length and are composed of a frame header, a frame address, frame data, and a frame check. The frame header is 7-bit 1100111, the frame address is 2-bit octal address information, the frame data is 15-bit hexadecimal data information, and the frame check is obtained by exclusive-OR operation of the frame header and the frame data. The frame header identifies the start bit, the frame address identifies the identity of the component sending the data, the frame data is the data information to be sent, and the frame check is used as the exclusive-OR check bit.

4. A data interaction control method for an industrial gas system based on a common LCU according to claim 1, characterized in that, In step S2, the communication protocol processing is specifically as follows: Before data transmission, add a bit 0 after the transmission data frame header and in the middle of the data frame. According to the exclusive-OR verification principle, if the verification bit is 1 after data transmission, it indicates that the entire data transmission process is normal and there is no data abnormality or other error in the data frame. If the verification bit is 0, it indicates that there may be a data error in the data frame, and all the data in the data frame needs to be retransmitted.

5. A data interaction control method for an industrial gas system based on a common LCU according to claim 1, characterized in that, In step S3, the data acquisition step is specifically as follows: Data acquisition is obtained by different sensors. The selection of sensors needs to be screened according to the category of measured parameters. The parameters to be measured include pressure, temperature, flow rate, rotational speed, and liquid level. Among them, pressure is obtained by the sensor converting the pressure signal into a voltage signal and outputting it. After converting the analog quantity into a digital quantity, it is sampled by the AD conversion module. Temperature directly outputs a 4-20ma analog quantity through the temperature sensor and is obtained after ADC conversion; rotational speed is measured by the rotational speed sensor, and the liquid level is measured by the liquid level sensor; the screening process of the flow sensor is as follows: The air flow rate in the industrial gas system needs to be selected according to the unit or system status. For the gas supply pipe group, the air flow rate does not need to be known during the start and stop of the unit, and a mechanical flow meter is selected; while during the normal operation or low-speed operation of the unit, the air flow rate and the actual pressure of the pipe group need to be known in real time. At this time, the gas flow sensor needs to be selected according to the unit status. The flow sensor needs to be selected according to the pipe diameter size, and different pipe diameters correspond to different types of flow sensors; For the fuel pipe group, since the fuel is always in a combustion state, the corresponding flow sensor needs to be selected according to the pipe diameter size.

6. A data interaction control method for an industrial gas system based on a common LCU according to claim 1, characterized in that, In step S, the data transmission process is specifically as follows: A: Data transmission is divided into real-time data transmission and periodic data transmission. Among them, real-time data transmission is controlled and started by the general LCU module. Periodic data transmission does not require control by the controller and is jointly completed by the public LCU module and the local LCU module. Among them, periodic transmission data is sent to the public LCU and the local LCU in real time to ensure that the initial data collected by the sensor can be obtained by the public LCU and the local LCU. The public LCU module and the local LCU module make judgments based on the initial data. If it belongs to the public data group, the public LCU will directly send the received data to the public LCU. If it belongs to the common data group, the public LCU module will send the data to the local LCU module, and the local LCU module will perform control calculations. After the calculation is completed, the calculation result will be sent to the public LCU module for processing; B: The public LCU module sends periodic data and data instructions to the local LCU module through the CAN bus. The periodic data is used to keep the information synchronization between the public LCU module and the local LCU module, and the data instructions are used to obtain the calculation data in the local LCU module. The local LCU module makes data judgments based on the data instructions and periodic data. If it belongs to the private data group, then the local LCU module processes the data and does not send it to the public LCU module; if it belongs to the common data group, then the local LCU module processes the data and sends the result to the public LCU module.

7. A data interaction control method for an industrial gas system based on a common LCU according to claim 1, characterized in that, The process of step S6 includes: S61, determining that the industrial gas system is in an unstable state; S62, performing data interaction of the industrial gas system in an asynchronous control mode to obtain the coupling coefficient and the overall coupling coefficient of the industrial gas system; S63, obtaining the influence probability of the coupling coefficient during the system state transition process according to the system state transition process; S64, allocating corresponding module data storage and processing resources according to the coupling coefficient and the influence probability; S65, interactively storing the data and instructions of each cooperation group according to the asynchronous control strategy; S66, performing target scenario data modeling according to the asynchronous control strategy.

8. A data interaction control method for an industrial gas system based on a common LCU according to claim 1, characterized in that, In step S4, the data transmission uses the CAN bus communication protocol, and this transmission protocol includes two main parts: namely, the definition of the data frame format and the hardware circuit design; the data frame format design: in the data frame format design, the data is divided into periodic data and real-time data. In terms of the transmission format, since the periodic data is transmitted in real time, there is no need to identify the frame head and frame tail for the data, and only the data needs to be verified; however, since the data processing work needs to be completed before the real-time data is transmitted, the frame head and frame tail need to be added during the real-time data transmission to confirm the position of the data and prevent data confusion and data errors during the data processing process. The specific content of the periodic data transmission protocol is as follows: First, the frame head: The frame head is used to confirm the start of the data. In the periodic data frame, the frame head indicates that the data in this frame format is in the periodic data transmission format; Second, the data length of the periodic data transmission protocol: It is 10 bits, which is the number of bytes of data contained in the periodic data frame; Third, the data content: 1 byte, the data measured by the sensor in the current period, including the time stamp T1; Fourth, the data verification: It is the exclusive OR result of the data and the frame head, and the main purpose is to prevent data errors in the transmitted frame and ensure the correct and reliable transmission of the data; The data length of the real-time data transmission protocol is greater than that of the periodic data, and the data length is designed to be 10 bits. The specific content of the frame format design is as follows: First, the frame head: The frame head is used to confirm the start of the data. In the real-time data frame, the frame head indicates that the data in this frame format is in the real-time data transmission format; Second, the data length of the real-time data transmission protocol: It is 10 bits, which is the number of bytes of data contained in the real-time data frame; Third, the data content: 2 bytes, representing the result T2 calculated by the local LCU, which is the exclusive OR result of each byte in the sensor measurement data frame contained in the real-time data frame to prevent data transmission failures. IV. Data verification: It is the exclusive OR result of the data and the frame header. The main purpose is to prevent data errors in the transmitted frame and ensure the correct and reliable transmission of the data; the hardware circuit design: The communication hardware circuit design mainly includes the CAN bus and the controller. The CAN bus includes a CAN bus controller and a CAN transceiver. The connection relationship is that the CAN bus controller is connected to the CPU, and the CAN transceiver is connected to the CAN bus controller. The connection method is usually a serial connection method. The CAN transceiver includes CANH and CANL. When connecting CANH and CANL, a connector with shielding function needs to be used to prevent external signal interference from affecting the operation of the CAN bus. When connecting CANH and CANL, they are first optically isolated and then connected to the CPU; the CAN bus controller and the processor CPU can be connected through the IO port. In the actual control system, 4 IO ports are often used for connection. The CAN bus controller needs to be connected to the CAN transceiver, and the CAN transceiver needs to be connected to the CAN bus. Through the above hardware connection, the reliability of the CAN bus data is ensured.

9. The industrial gas system data interaction control method based on a common LCU according to claim 1, characterized in that In step S5, the data processing is specifically as follows: After receiving the data, the common LCU module calls local or remote algorithms for data analysis and processing according to the needs of different algorithms. The algorithm processing is carried out through the general LCU module or the local LCU module. At the same time, the result is sent to the local LCU module through the CAN bus, and some interfaces are reserved for different algorithms to ensure the free update of the algorithms.

Images