A bus control-based distributed multi-point ignition control system and method

Abstract

The application discloses a kind of distributed multi ignition control system and method based on bus control, the system is by PLC man-machine interface, central ignition unit, multiplex bus, multiple groups of parallelly connected node ignition unit and its corresponding explosive device composition.Central ignition unit is connected in parallel with each node ignition unit by multiplex bus.Multiplex bus simultaneously transmits (18~36) V power and communication signal.The bus connection end of node ignition unit is non-polarity design.PLC man-machine interface is man-machine interactive window, the charging, ignition and other operation instructions of operator are encoded according to design protocol, coupled to multiplex bus by central ignition unit, and transmitted to node ignition unit by multiplex bus, and relevant instructions are parsed and executed by node ignition unit.The application reduces the complexity of cluster ignition control system, wiring is simple, node ignition unit uses non-polarity design, and can be flexibly configured and expanded.

Description

Technical Field

[0001] This invention relates to the field of pyrotechnics technology, specifically to a distributed multi-channel ignition control system and method based on bus control. Background Technology

[0002] Spacecraft launched using booster rockets are characterized by rapid deployment, high maneuverability, and low site requirements. Employing multi-launcher systems and control for swarm flight enables them to exert suppressive strikes against enemy forces, effectively improving the survivability and mission efficiency of the spacecraft. Currently, the launch method involves placing an ignition box at the near end of the booster rocket and a node ignition unit at the far end. During the booster rocket launch phase, power and communication are maintained between the far-end node ignition unit and the near-end ignition box. At launch, the far-end node ignition unit issues an ignition command, and upon receiving the command, the near-end ignition box ignites the pyrotechnics, thus igniting and launching the booster rocket.

[0003] Currently, the near-end ignition boxes and booster rockets are configured one-to-one, while the far-end ignition unit is configured with one unit as the control core, providing power and communication for all ignition boxes. During cluster launches, the near-end ignition boxes of the booster rockets are connected to the far-end ignition units via long-distance power and communication cables. This results in complex wiring, poor system scalability, and cumbersome operation. Furthermore, the far-end ignition units are large and heavy, and lack the capability to be carried to the field. Summary of the Invention

[0004] Based on the above-mentioned technical problems, this invention proposes a distributed multi-channel ignition control system and method based on bus control to solve the problems of high complexity, poor compatibility, poor real-time performance and synchronization of current long-distance cluster ignition control systems. Based on bus multiplexing technology, capacitor discharge ignition technology, visual human-computer interaction and other technologies are integrated into electromechanical equipment to realize the networking and intelligence of long-distance multi-node capacitor discharge ignition control system.

[0005] To address the aforementioned technical problems, one objective of this invention is to provide a bus-based distributed multi-channel ignition control system, comprising a PLC human-machine interface, a central ignition unit, a multiplexed bus, multiple sets of parallel-connected node ignition units and their corresponding pyrotechnic devices; the central ignition unit is connected in parallel with each node ignition unit via the multiplexed bus; the multiplexed bus simultaneously transmits (18~36) VDC power and communication signals, with a typical power voltage of 28VDC; the bus connection terminals of the node ignition units are designed to be non-polarized, with the node ignition units located near the pyrotechnic devices; and the central ignition unit located at the far end of the pyrotechnic devices.

[0006] Furthermore, the center ignition unit consists of a center ignition controller, a center signal coupling circuit, a center power supply conversion module, and a power supply. The center ignition controller communicates with the PLC human-machine interface via serial port UART#2. The center ignition controller communicates with the center signal coupling circuit via serial port UART#1, using a transparent protocol. The center ignition controller uses I / O ports to collect the status feedback information of the center signal coupling circuit in real time. When the status feedback information of the center signal coupling circuit is abnormal, the center ignition controller promptly shuts off the power supply to the multiplexed bus to ensure system safety. The power supply converts 220VAC AC mains power into (18~36)V DC power to power the center ignition unit and each node ignition unit. The typical power supply voltage is 28VDC. The center power supply conversion module converts the input voltage into 5VDC and 12VDC to meet the control power requirements of the center ignition unit. The power supply supplies power to the multiplexed bus through the center signal coupling circuit, and then supplies power to each node ignition unit. The center signal coupling circuit receives communication signals from the center ignition controller and couples them to the multiplexed bus, parses the communication signals from the multiplexed bus and transmits them to the center ignition controller.

[0007] Furthermore, the node ignition unit comprises a node signal coupling circuit, a node ignition controller, a node power supply conversion module, a data acquisition module, and a capacitor discharge ignition circuit. The node ignition controller communicates with the node signal coupling circuit via a UART serial port, employing a transparent protocol. The node ignition controller acquires the resistance of the pyrotechnic device and the capacitor voltage in real time via an ADC interface. The node ignition controller controls the capacitor discharge ignition circuit to charge, discharge, and ignite via I / O ports, and acquires the status feedback information of the capacitor discharge ignition circuit in real time via I / O ports. When the status feedback information of the capacitor discharge ignition circuit is abnormal, the node ignition controller enables the discharge command, controlling the capacitor discharge ignition circuit to completely discharge the energy of the capacitor, ensuring the safety of the pyrotechnic device. The capacitor discharge ignition circuit is the execution circuit for the charging, discharging, and ignition commands. The multiplexed bus supplies power to the node ignition unit via the node signal coupling circuit. The power supply conversion module converts the input voltage to 5VDC and 12VDC to meet the control power requirements of the node ignition unit. The power supply conversion module converts the input voltage to 48VDC to provide power to the capacitor discharge ignition circuit.

[0008] Furthermore, the PLC human-machine interface is a human-machine interaction window that encodes and processes the operator's query, charging, discharging, and ignition operation instructions according to the design protocol. The communication signals are coupled to the multiplexing bus through the central ignition unit and transmitted to the node ignition unit through the multiplexing bus. The node ignition unit parses and executes the relevant instructions to complete the signal transmission from the PLC human-machine interface to the node ignition unit.

[0009] Furthermore, the node ignition unit is an instruction execution mechanism. The node ignition unit encodes the collected real-time data according to the design protocol, couples the communication signal to the multiplexing bus through the node signal coupling circuit, and transmits it to the central ignition unit through the multiplexing bus. The central ignition unit collects and transmits the data to the PLC human-machine interface for parsing and real-time data display, thus completing the signal transmission from the node ignition unit to the PLC human-machine interface.

[0010] Furthermore, the communication network adopts a bus network topology with a master-slave logical structure. The central ignition unit is the master node, and the node ignition units are slave nodes. On the master-slave logical network, each node ignition unit has a unique address number. The central ignition unit is the only master node, and it is not necessary to assign an address number to the central ignition unit.

[0011] Based on the same concept, this invention also proposes a control method for a bus-based distributed multi-channel ignition control system. The communication process for completing one full control method is as follows: S1: Before communication begins, the PLC human-machine interface, the central ignition unit, and the node ignition unit should be configured with parameters such as communication baud rate and address number in advance. S2: PLC HMI Inquiry Phase: The PLC HMI sends a command to the node ignition unit at the specified address. After sending the command, the PLC HMI waits for a certain period of time to obtain the response from the node ignition unit. If the PLC HMI receives the correct response information from the node ignition unit at the end of the waiting time, it means that the PLC HMI and the node ignition unit are communicating normally. If the PLC HMI does not receive any information, receives an incorrect information, or the response information has not been fully transmitted, it is considered that the communication between the PLC HMI and the node ignition unit is abnormal. S3: Node Ignition Unit Response Phase: The node ignition unit parses the received instructions and organizes corresponding information to reply to the PLC HMI. The node ignition unit clears the receive buffer and related variables, and waits for the next instruction from the PLC HMI. Any complete communication is initiated by the PLC HMI. Before being addressed by the PLC HMI, the node ignition unit can only be in a listening state. After receiving the instruction, the node ignition unit determines whether the instruction addresses itself. If so, the node ignition unit gives a corresponding response to the PLC HMI; otherwise, the node ignition unit does not respond.

[0012] The above-mentioned technical solutions of the present invention have at least one or more of the following technical effects: the present invention reduces the complexity of the cluster ignition control system, simplifies wiring, and the node ignition unit adopts a non-polarity design, which can be flexibly configured and expanded. Attached Figure Description

[0013] Figure 1 This is the overall block diagram; Figure 2 This refers to the communication process. Detailed Implementation

[0014] This invention discloses a distributed multi-channel ignition control system and method based on bus control, comprising a PLC human-machine interface, a central ignition unit, a multiplexed bus, multiple sets of parallel-connected node ignition units, and their corresponding pyrotechnic devices. The central ignition unit is connected in parallel with each node ignition unit via the multiplexed bus. The multiplexed bus simultaneously transmits (18~36)V power and communication signals. The bus connection terminals of the node ignition units are designed with non-polarity. The PLC human-machine interface is the human-machine interaction window, encoding and processing the operator's charging, ignition, and other operation commands according to the design protocol. These commands are coupled to the multiplexed bus through the central ignition unit and transmitted to the node ignition units, where they are parsed and executed. This invention reduces the complexity of the cluster ignition control system, simplifies wiring, and the node ignition units, with their non-polarity design, allow for flexible configuration and expansion.

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments obtained. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0016] The overall block diagram of the bus-based distributed multi-ignition control system and method is shown below. Figure 1 The system consists of a PLC human-machine interface, a central ignition unit, a multiplex bus, multiple sets of parallel-connected node ignition units and their corresponding pyrotechnic devices; the central ignition unit is connected in parallel with each node ignition unit through the multiplex bus; the multiplex bus simultaneously transmits (18~36) VDC power and communication signals, and the typical power voltage of the multiplex bus is 28VDC; the bus connection terminals of the node ignition units are designed to be non-polarized; the node ignition units are arranged near the pyrotechnic devices, and the central ignition unit is arranged at the far end of the pyrotechnic devices.

[0017] The center ignition unit consists of a center ignition controller, a center signal coupling circuit, a center power supply conversion module, and a power supply. The center ignition controller communicates with the PLC HMI via UART#2 serial port. The center ignition controller communicates with the center signal coupling circuit via UART#1 serial port, using a transparent protocol. The center ignition controller uses I / O ports to collect the status feedback information of the center signal coupling circuit in real time. When the status feedback information of the center signal coupling circuit is abnormal, the center ignition controller promptly shuts off the power supply to the multiplexed bus to ensure system safety. The power supply converts 220VAC AC mains power into (18~36)V DC power to power the center ignition unit and each node ignition unit, with a typical power supply voltage of 28VDC. The center power supply conversion module converts the input voltage into 5VDC and 12VDC to meet the control power requirements of the center ignition unit. The power supply powers the multiplexed bus through the center signal coupling circuit, thereby powering each node ignition unit. The center signal coupling circuit receives communication signals from the center ignition controller and couples them to the multiplexed bus, parses the communication signals from the multiplexed bus, and transmits them to the center ignition controller.

[0018] The node ignition unit consists of a node signal coupling circuit, a node ignition controller, a node power supply conversion module, a data acquisition module, and a capacitor discharge ignition circuit. The node ignition controller communicates with the node signal coupling circuit via a UART serial port, using a transparent protocol. The node ignition controller acquires the resistance of the pyrotechnic device and the voltage of the capacitor in real time through an ADC interface. The node ignition controller controls the capacitor discharge ignition circuit to charge, discharge, and ignite through I / O ports, and acquires the status feedback information of the capacitor discharge ignition circuit in real time through I / O ports. When the status feedback information of the capacitor discharge ignition circuit is abnormal, the node ignition controller enables the discharge command, controlling the capacitor discharge ignition circuit to completely discharge the energy of the capacitor, ensuring the safety of the pyrotechnic device. The capacitor discharge ignition circuit is the execution circuit for the charging, discharging, and ignition commands. The multiplexed bus supplies power to the node ignition unit through the node signal coupling circuit. The power supply conversion module converts the input voltage to 5VDC and 12VDC to meet the control power requirements of the node ignition unit. The power supply conversion module also converts the input voltage to 48VDC to provide power to the capacitor discharge ignition circuit.

[0019] The PLC human-machine interface is a human-machine interaction window. It encodes and processes the operator's operation instructions such as query, charging, discharging, and ignition according to the design protocol. The communication signal is coupled to the multiplexing bus through the central ignition unit and transmitted to the node ignition unit through the multiplexing bus. The node ignition unit parses and executes the relevant instructions to complete the signal transmission from the PLC human-machine interface to the node ignition unit.

[0020] The node ignition unit is the instruction execution mechanism. The node ignition unit encodes and processes the collected real-time data according to the design protocol, couples the communication signal to the multiplexing bus through the node signal coupling circuit, and transmits it to the central ignition unit through the multiplexing bus. The central ignition unit collects and transmits the data to the PLC human-machine interface for parsing and real-time data display, thus completing the signal transmission from the node ignition unit to the PLC human-machine interface.

[0021] The communication network adopts a bus network topology with a master-slave logical structure. The central ignition unit is the master node, and the node ignition units are slave nodes. On the master-slave logical network, each node ignition unit has a unique address number. The central ignition unit is the only master node, and it is not necessary to assign an address number to the central ignition unit.

[0022] See communication process Figure 2 A complete communication process consists of two stages: PLC HMI inquiry and node ignition unit response. Before communication begins, the PLC HMI, central ignition unit, and node ignition units should have their communication baud rate, address number, and other parameters pre-set. During the PLC HMI inquiry stage: the PLC HMI sends a command to the node ignition unit at the specified address. After sending the command, the PLC HMI waits for a certain period to receive a response from the node ignition unit. If the PLC HMI receives a correct response from the node ignition unit at the end of the waiting period, it indicates that communication between the PLC HMI and the node ignition unit is normal. If the PLC HMI does not receive any information or receives an incorrect response, the communication is considered normal. If the message or response information has not been fully transmitted, it is considered a communication abnormality between the PLC HMI and the node ignition unit. During the node ignition unit's response phase: the node ignition unit parses the received instruction and organizes the corresponding information to reply to the PLC HMI. The node ignition unit clears the receive buffer and related variables and waits for the next instruction from the PLC HMI. Any complete communication is initiated by the PLC HMI. The node ignition unit can only be in a listening state before being addressed by the PLC HMI. After receiving the instruction, the node ignition unit determines whether the instruction addresses itself. If so, the node ignition unit gives a corresponding response to the PLC HMI; otherwise, the node ignition unit does not respond.

[0023] The node ignition unit has functions for command validity judgment, query, charging, discharging, ignition, and pyrotechnic resistance testing. The command validity judgment function is independent, determining whether the received command is valid and meets the execution conditions. The query function is independent, responding only to a single command; upon receiving a query command from the PLC HMI, it executes the command to respond with operating status information. The de-protection function is independent, responding only to a single command; upon receiving a charging command from the PLC HMI, it executes the command to charge the capacitor. The discharging function is independent, responding only to a single command; upon receiving a discharging command from the PLC HMI, it executes the command to dissipate all the energy from the capacitor. The ignition function is independent, responding only to a single command sequence; upon receiving an ignition command sequence from the PLC HMI, it executes the command to release the energy from the capacitor and ignite the pyrotechnic device. The pyrotechnic resistance testing function responds only to a single command; upon receiving a pyrotechnic resistance test command from the PLC HMI, it executes the command to test the resistance of the pyrotechnic device. If the node ignition unit fails to perform a discharge ignition action within a specified time after charging the capacitor, it automatically performs discharging.

[0024] This invention is applied to rocket-boosted spacecraft cluster launches, and its functional performance meets technical requirements after flight testing. It is also applied to a research project on a bus-controlled distributed multi-channel ignition control system. Addressing the problems of high complexity, poor compatibility, and poor real-time performance and synchronization in long-distance cluster ignition control systems, this invention integrates capacitor discharge ignition technology and visual human-machine interaction into the electromechanical equipment based on bus multiplexing technology, realizing a networked and intelligent long-distance multi-node capacitor discharge ignition control system. This system has a simple architecture, flexible and scalable node configuration, and is of great significance for realizing cluster launches of spacecraft.

[0025] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations to the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A distributed multi-channel ignition control system based on bus control, characterized in that: It consists of a PLC human-machine interface, a central ignition unit, a multiplexed bus, multiple sets of parallel-connected node ignition units and their corresponding pyrotechnic devices; the central ignition unit is connected in parallel with each node ignition unit through the multiplexed bus; the multiplexed bus simultaneously transmits (18~36) VDC power and communication signals, and the typical power voltage of the multiplexed bus is 28VDC; the bus connection terminals of the node ignition units are designed to be non-polarized, and the node ignition units are arranged near the pyrotechnic devices; the central ignition unit is arranged at the far end of the pyrotechnic devices.

2. The distributed multi-channel ignition control system based on bus control according to claim 1, characterized in that: The central ignition unit consists of a central ignition controller, a central signal coupling circuit, a central power supply conversion module, and a power supply. The central ignition controller communicates with the PLC human-machine interface via UART#2 serial port. The central ignition controller communicates with the central signal coupling circuit via UART#1 serial port, using a transparent protocol. The central ignition controller uses I / O ports to collect the status feedback information of the central signal coupling circuit in real time. When the status feedback information of the central signal coupling circuit is abnormal, the central ignition controller promptly shuts off the power supply to the multiplexed bus to ensure system safety. The power supply converts 220VAC AC mains power into (18~36)V DC power to power the central ignition unit and each node ignition unit, with a typical power supply voltage of 28VDC. The central power supply conversion module converts the input voltage into 5VDC and 12VDC to meet the control power requirements of the central ignition unit. The power supply powers the multiplexed bus through the central signal coupling circuit, thereby powering each node ignition unit. The central signal coupling circuit receives communication signals from the central ignition controller and couples them to the multiplexed bus, parses the communication signals from the multiplexed bus, and transmits them to the central ignition controller.

3. The distributed multi-channel ignition control system based on bus control according to claim 1, characterized in that: The node ignition unit consists of a node signal coupling circuit, a node ignition controller, a node power supply conversion module, a data acquisition module, and a capacitor discharge ignition circuit. The node ignition controller communicates with the node signal coupling circuit via a UART serial port, using a transparent protocol. The node ignition controller acquires the resistance of the pyrotechnic device and the voltage of the capacitor in real time through an ADC interface. The node ignition controller controls the capacitor discharge ignition circuit to charge, discharge, and ignite through I / O ports, and acquires the status feedback information of the capacitor discharge ignition circuit in real time through I / O ports. When the status feedback information of the capacitor discharge ignition circuit is abnormal, the node ignition controller enables the discharge command, controlling the capacitor discharge ignition circuit to completely discharge the energy of the capacitor, ensuring the safety of the pyrotechnic device. The capacitor discharge ignition circuit is the execution circuit for the charging, discharging, and ignition commands. The multiplexed bus supplies power to the node ignition unit through the node signal coupling circuit. The power supply conversion module converts the input voltage to 5VDC and 12VDC to meet the control power requirements of the node ignition unit. The power supply conversion module converts the input voltage to 48VDC to provide power to the capacitor discharge ignition circuit.

4. The distributed multi-channel ignition control system based on bus control according to claim 1, characterized in that: The PLC human-machine interface is a human-machine interaction window. It encodes and processes the operator's query, charging, discharging and ignition operation instructions according to the design protocol. The communication signal is coupled to the multiplexing bus through the central ignition unit and transmitted to the node ignition unit through the multiplexing bus. The node ignition unit parses and executes the relevant instructions to complete the signal transmission from the PLC human-machine interface to the node ignition unit.

5. The distributed multi-channel ignition control system based on bus control according to claim 1, characterized in that: The node ignition unit is the instruction execution mechanism. The node ignition unit encodes and processes the collected real-time data according to the design protocol, couples the communication signal to the multiplexing bus through the node signal coupling circuit, and transmits it to the central ignition unit through the multiplexing bus. The central ignition unit collects and transmits the data to the PLC human-machine interface for parsing and real-time data display, thus completing the signal transmission from the node ignition unit to the PLC human-machine interface.

6. The distributed multi-channel ignition control system with opportunity bus control according to claim 1, characterized in that: The communication network adopts a bus network topology with a master-slave logical structure. The central ignition unit is the master node, and the node ignition units are slave nodes. On the master-slave logical network, each node ignition unit has a unique address number. The central ignition unit is the only master node, and it is not necessary to assign an address number to the central ignition unit.

7. The control method for a bus-based distributed multi-channel ignition control system according to any one of claims 1-6, characterized in that, The communication process for completing a full control method is as follows: S1: Before communication begins, the PLC human-machine interface, the central ignition unit, and the node ignition unit should be configured with parameters such as communication baud rate and address number in advance. S2: PLC HMI Inquiry Phase: The PLC HMI sends a command to the node ignition unit at the specified address. After sending the command, the PLC HMI waits for a certain period of time to obtain the response from the node ignition unit. If the PLC HMI receives the correct response information from the node ignition unit at the end of the waiting time, it means that the PLC HMI and the node ignition unit are communicating normally. If the PLC HMI does not receive any information, receives an incorrect information, or the response information has not been fully transmitted, it is considered that the communication between the PLC HMI and the node ignition unit is abnormal. S3: Node Ignition Unit Response Phase: The node ignition unit parses the received instructions and organizes corresponding information to reply to the PLC HMI. The node ignition unit clears the receive buffer and related variables, and waits for the next instruction from the PLC HMI. Any complete communication is initiated by the PLC HMI. Before being addressed by the PLC HMI, the node ignition unit can only be in a listening state. After receiving the instruction, the node ignition unit determines whether the instruction addresses itself. If so, the node ignition unit gives a corresponding response to the PLC HMI; otherwise, the node ignition unit does not respond.

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