Fire alarm and access control linkage method and system

Abstract

The invention discloses a fire alarm and access control linkage method and system. The method comprises the steps of signal receiving and verification, target access control determination, intelligent control release execution, anti-interference processing and cross-brand adaptation. The system comprises a multi-channel signal transmission module, a double-loop verification module, a central control unit, an intelligent control release execution module, a secondary release trigger module, an anti-interference processing module and a protocol adaptive conversion module, the problem of signal interruption caused by dependence of a traditional single channel is solved; the intelligent unlocking execution module ensures thoroughness in unlocking through graded current monitoring and a secondary release mechanism; the anti-interference processing module adopts differential coding and frequency hopping communication to resist electromagnetic interference; the protocol adaptive conversion module realizes seamless integration of multi-brand equipment, reduces the cost and maintenance difficulty, and improves the reliability and practicability of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building fire safety applications, in particular to a fire alarm and access control linkage method and system. BACKGROUND

[0002] In the field of building fire safety, ensuring rapid evacuation of personnel in emergency situations is a core requirement. The fire alarm and access control linkage system, as a key facility, directly affects the response efficiency of disasters such as fire. The traditional fire access control system often focuses on daily management functions in terms of structural design, and lacks special optimization for emergency scenarios, resulting in problems such as response lag, signal failure, and device coordination difficulties in actual application, making it difficult to meet the high standards of modern buildings for fire safety.

[0003] The common fire access control system has many technical defects in emergency situations: first, signal transmission relies on a single channel, and line damage or strong electromagnetic interference caused by fire can easily cause signal interruption, and there is a lack of effective verification mechanism, leading to the risk of misjudgment or omission; second, the door unlocking logic is fixed and only operates in a preset order, which cannot be dynamically adjusted according to the evolution of the fire, often delaying evacuation due to blocked passages; third, the signal transmission has weak anti-interference ability and is easily lost in complex electromagnetic environments, directly causing unlocking failure; fourth, multi-brand device coordination requires additional hardware modification, with high integration cost and complex maintenance, limiting the popular application of the system and failing to meet the working requirements of building fire safety applications, therefore a fire alarm and access control linkage method and system is proposed. SUMMARY

[0004] The present application provides the following technical solution: a fire alarm and access control linkage method, comprising the following steps: S1 signal reception and verification: First, the multi-channel signal transmission module receives the fire alarm signal through wired and wireless channels at the same time, then the time stamp synchronization unit calibrates the time of each channel signal, and compares the signal content and time stamp information through a double-loop verification mechanism, when the main channel signal fails, it automatically switches to the standby channel, through the main and standby channel redundant transmission and double verification mechanism, solves the problem of signal interruption or misjudgment caused by the dependence of traditional system single channel, ensures the real-time and synchronization of alarm signal reception in fire scene, significantly improves the success rate of signal transmission; S2 target access control determination: The central control unit generates a dynamic unlocking sequence through a door access priority algorithm according to the fire alarm point position, evacuation passage width and personnel density parameters, and at the same time, the central control unit combines the three-dimensional model of the building structure to simulate the fire spread speed and direction in real time, and corrects the dynamic unlocking sequence in real time. When it is predicted that the evacuation passage will be blocked by fire in a short time, the standby evacuation door access around the passage is unlocked in advance. The dynamic door access priority algorithm combined with the fire simulation technology breaks through the limitations of the traditional fixed unlocking sequence, avoids the blockage of the evacuation path through real-time correction of the unlocking sequence, and significantly improves the personnel escape efficiency in emergency situations. S3 intelligent control execution: According to the dynamic unlocking sequence generated in step S2, the central control unit sends an unlocking instruction to the electromagnetic lock of the target door access, and then the hierarchical current feedback detection circuit monitors the electromagnetic lock coil current in real time. When the stable current value reaches the preset unlocking threshold, the state feedback component feeds back the unlocked state; if the threshold is not reached, the secondary release mechanism is triggered and the unlocking failure state is fed back. The hierarchical current monitoring and secondary release mechanism ensure the completeness of the electromagnetic lock unlocking. Even if the first unlocking fails, it can still be completed through mechanical assistance or power adjustment. Synchronization pushes maintenance information to reduce human intervention delay; S4 anti-interference processing: In the signal transmission process, the differential encoding unit of the anti-interference processing module converts the fire alarm signal into a differential signal. Then, the signal enhancement circuit dynamically adjusts the transmission power according to the complexity of the electromagnetic environment. At the same time, through the electromagnetic environment monitoring sensor, the electromagnetic interference frequency and intensity of the surrounding environment are monitored in real time. When strong interference of a specific frequency is detected, it automatically switches to frequency hopping communication mode. The differential signal conversion and dynamic frequency hopping communication technology effectively resist the complex electromagnetic interference in the fire scene, avoid unlocking failure caused by signal failure, and ensure the stability of the instruction transmission. S5 cross-brand adaptation: Through the protocol adaptive conversion module, the brand and model of the access control device are automatically identified, the corresponding communication protocol is matched, and the cross-brand transmission of the unlocking instruction is realized. The protocol adaptive conversion technology realizes seamless integration of multiple brands of devices without the need for hardware modification, greatly reducing the system deployment cost and maintenance difficulty, and solving the core pain point of poor compatibility of traditional systems.

[0005] A fire alarm and door access linkage system adopts the above-mentioned fire alarm and door access linkage method, comprising: The multi-channel signal transmission module is connected with the fire alarm system through wired and wireless links, and is used for receiving the fire alarm signal. The multi-channel signal transmission module is internally provided with a timestamp synchronization unit. Through wired and wireless dual-channel redundant design, combined with timestamp synchronization technology, the real-time and synchronization of the alarm signal receiving under the fire scene are ensured. When the main channel fails due to line damage or strong electromagnetic interference, the backup channel is automatically switched to and the abnormal data is repaired, so that the signal interruption problem caused by the single-channel dependence of the traditional system is solved. The dual-loop verification module is connected to the data interface end of the timestamp synchronization unit through a data line. The dual-loop verification module is used for comparing the signal content and the timestamp. The multi-channel signal transmission module is connected with a central control unit through a bus. The central control unit is internally provided with an access control priority algorithm. The dual-loop verification mechanism verifies the signal content and the timestamp, quickly identifies and repairs abnormal data packets, avoids unlocking delay caused by signal misjudgment, cooperates with the dynamic algorithm of the central control unit, and realizes accurate matching of fire information and access control. The intelligent control execution module is connected to the data output end of the central control unit through a control line. The intelligent control execution module is used for receiving the dynamic unlocking sequence and unlocking instruction sent by the central control unit. The intelligent control execution module includes a hierarchical current feedback detection circuit. The hierarchical current feedback detection circuit is connected with an electromagnetic lock. The hierarchical current monitoring and secondary release mechanism ensures the thoroughness of the electromagnetic lock unlocking. Even if the first unlocking fails, the release can still be completed through mechanical assistance or power supply adjustment. Synchronous pushing of maintenance information reduces human intervention delay and improves execution reliability in emergency situations. The secondary release trigger module is connected to the output end of the hierarchical current feedback detection circuit. The multi-channel transmission module and the central control unit are connected with an anti-interference processing module through a line. The anti-interference processing module internally integrates a differential encoding unit. The differential encoding unit is used for converting the fire alarm signal into a differential signal. The differential signal conversion and dynamic frequency hopping communication technology effectively resist complex electromagnetic interference in the fire scene, avoid unlocking failure caused by signal failure, ensure the stability of the instruction transmission, and solve the core pain point of the traditional system in the strong interference environment. The protocol adaptive conversion module is connected to the data receiving end of the central control unit through a communication interface. The protocol adaptive conversion module is used for automatically identifying the brand and model of the access control device and matching the corresponding communication protocol. The protocol adaptive conversion technology realizes seamless integration of multiple brands of devices. Without hardware modification, the protocol matching can be completed, which greatly reduces the system deployment cost and maintenance difficulty, and solves the difficulty of cooperative work caused by poor compatibility of the traditional system.

[0006] Preferably, the double-loop verification mechanism in step S1 also includes a signal integrity verification process. Based on the comparison of signal content and timestamp information, the data packet structure of the signal is checked piece by piece to check for data loss, duplication, and tampering. When an anomaly is found in the signal, a signal repair program is automatically started to complete the missing part through redundant data. If the repair fails, a three-level early warning mechanism is immediately triggered, and a signal anomaly report is sent to the fire control center.

[0007] Preferably, the access priority algorithm in step S2 synchronously incorporates historical evacuation data for analysis when generating a dynamic unlocking sequence. The historical evacuation data includes the actual evacuation efficiency of each evacuation channel and the personnel passing rate after the door lock is unlocked in similar past fire scenarios. The historical evacuation data is trained through a machine learning model, and when the sequence is corrected, the real-time smoke concentration monitoring data is synchronously combined to reduce the unlocking priority of the door lock corresponding to the evacuation channel covered by smoke.

[0008] Preferably, the secondary release mechanism in step S3 first analyzes the reason why the electromagnetic lock coil current does not reach the threshold value through a hierarchical current feedback detection circuit. If it is judged to be mechanical jamming, a vibration auxiliary device is started to eliminate the jamming through a preset frequency of vibration. If it is judged to be insufficient power supply, the power supply voltage is temporarily increased, and the power supply time is extended. At the same time, the state feedback component sends a prompt message to nearby emergency personnel carrying a special unlocking tool.

[0009] Preferably, the frequency hopping communication mode in step S4 is provided with an intelligent frequency planning function. Based on the historical interference data collected by the electromagnetic environment monitoring sensor, a list of alternative frequencies with strong anti-interference ability is pre-planned. When switching to the frequency hopping mode, a frequency that is not currently interfered is selected from the list of alternative frequencies for communication, and the list of alternative frequencies is updated in real time to exclude frequently interfered frequencies.

[0010] Preferably, the protocol adaptive conversion module in step S5 uses a dual recognition mechanism when automatically identifying the brand and model of the access device. On the one hand, it performs preliminary identification through the identification information sent by the device, and on the other hand, it performs secondary confirmation by analyzing the communication characteristics of the device, including data transmission rate and frame structure. For newly connected unknown brand devices, the protocol adaptive conversion module automatically starts a temporary adaptation mode, which first establishes a basic communication connection and then gradually improves the protocol adaptation parameters through continuous communication interaction.

[0011] Preferably, during the whole process of the steps S1 to S5, a whole-process log recording module is arranged, the log recording module synchronously records the execution time, participating module, data change and result feedback of each operation step, meanwhile, the log recording of the log recording module adopts an encrypted storage mode, and the logs are classified and arranged according to time sequence and module category.

[0012] Preferably, the wired link of the multi-channel signal transmission module adopts an aviation plug and twisted pair combination structure, the wireless link is built-in with an omnidirectional antenna and is packaged in a metal shield, and the crystal oscillator of the time stamp synchronization unit is fixed to the module base through an elastic gasket.

[0013] Preferably, the hierarchical current feedback detection circuit of the intelligent control execution module is printed on a double-layer PCB board, the top layer of the double-layer PCB board is arranged with a sampling resistor and a differential amplifier, and the bottom layer of the double-layer PCB board is provided with a ground layer and a via array.

[0014] Compared with the prior art, the fire alarm and access control linkage method and system have the following beneficial effects: 1、The multi-channel signal transmission and intelligent verification mechanism improve the response efficiency and signal reliability of the traditional access control system in emergency, and the multi-channel signal transmission module receives the fire alarm signal through wired and wireless links at the same time, combines the calibration capability of the time stamp synchronization unit, ensures the real-time and synchronization of signal receiving, so that when the main channel is damaged or fails due to strong electromagnetic interference caused by fire, the dual-loop verification module can automatically switch to the standby channel, and through comparing the signal content and time stamp information, abnormal data packets can be quickly identified and repaired, through seamless switching and double verification mechanism of the main and standby channels, the signal interruption or misjudgment problem caused by single channel dependence of the traditional system is solved, and the success rate of signal transmission is improved. 2、The application simulates the fire spreading path dynamically through the access control priority algorithm of the central control unit, generates a precise dynamic unlocking sequence in combination with the three-dimensional model of the building structure and real-time environmental data, and when it is predicted that a certain evacuation passage will be blocked by fire, the system can unlock the surrounding standby access control in advance to avoid delay in escaping due to passage blockage, compared with the traditional fixed unlocking sequence of the access control system, the dynamic adjustment strategy based on the evolution of the fire situation significantly improves the smoothness of the evacuation path, and the differential encoding unit of the anti-interference processing module converts the signal into a differential signal, in combination with the signal enhancement circuit and the electromagnetic environment monitoring sensor, the transmission power can be dynamically adjusted in a complex electromagnetic environment, automatically switched to a frequency hopping communication mode when strong interference occurs, effectively resisting signal interference in the fire scene, avoiding unlocking failure, and the protocol adaptive conversion module can automatically identify the model of different brands of access control equipment and match the corresponding protocol, without additional hardware modification, the cooperative work of multiple brands of equipment can be realized, the system integration cost and maintenance difficulty are greatly reduced, the problems of unreliable signal transmission and poor compatibility of multiple brands of equipment of the traditional system are solved, and the stability and practicality of the system are improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a method flowchart of the application.

[0016] Figure 2 is a system architecture block diagram of the application. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0018] Please refer to Figure 1 The application provides a technical solution, a fire alarm and access control linkage method, comprising the following steps: S1 signal receiving and verification: First, the multi-channel signal transmission module receives the fire alarm signal through wired and wireless channels at the same time, then the time stamp synchronization unit calibrates the time of each channel signal, and compares the signal content and time stamp information through a double-loop verification mechanism, and when the main channel signal fails, it is automatically switched to the standby channel; The double-circuit verification mechanism also comprises a signal integrity verification process, which verifies the data packet structure of the signal piece by piece on the basis of comparing the signal content with the timestamp information, checks the problems of data loss, repetition and tampering, and automatically starts a signal repair program when an abnormality is found in the signal, fills in the missing part by using redundant data, and if the repair fails, immediately triggers a three-level early warning mechanism and sends a signal abnormality report to the fire control center. The specific implementation process of the above method is as follows: Firstly, the multi-channel signal transmission module starts to work and receives the fire alarm signal from the fire alarm system through wired and wireless links. The wired link uses the combination structure of aviation plug and twisted pair to ensure the stability of physical connection, and the wireless link uses the built-in omnidirectional antenna to receive signals, and the antenna is packaged in a metal shield to reduce external interference. After the signal enters the multi-channel signal transmission module, the internal timestamp synchronization unit starts to work. The crystal oscillator is fixed on the module base through an elastic pad to ensure stable operation in a vibrating environment. The signals received by the wired and wireless channels are time calibrated to ensure consistency in the time dimension, providing a basis for subsequent verification. The calibrated signal is transmitted to the double-circuit verification module through the data line. The module first compares the content and timestamp information of the two signals to check whether there is a time deviation or content inconsistency in the transmission process. If the main channel signal is normal, the subsequent processing is performed according to the main channel signal; if the main channel signal fails due to line damage, interference, etc., the double-circuit verification module immediately issues an instruction to control the multi-channel signal transmission module to switch to the standby channel, ensuring uninterrupted signal transmission. On this basis, the double-circuit verification module starts the signal integrity verification process to carefully verify the data packet structure of the signal piece by piece, and comprehensively checks whether there is a problem of data loss, repetition or tampering. When an abnormality is found in the signal, a signal repair program is automatically started to recover the integrity of the signal as much as possible by using pre-stored redundant data to fill in the missing part. During the whole process, the full-log recording module synchronously records the time of signal reception, channel switching, verification results, repair operations and warning information, etc., and classifies and organizes them in chronological order and module category. The encrypted storage method is used to ensure the security and integrity of the records, providing a reliable basis for subsequent tracing and analysis. S2 target access control determination: The central control unit generates a dynamic unlocking sequence according to the fire alarm point position, evacuation passage width and personnel density parameters through the access control priority algorithm, and simultaneously, the central control unit combines the three-dimensional model of the building structure to simulate the fire spread speed and direction in real time, and corrects the dynamic unlocking sequence in real time. When it is predicted that the evacuation passage will be blocked by fire in a short time, the surrounding standby evacuation access control of the passage is unlocked in advance; The access control priority algorithm synchronously incorporates historical evacuation data for analysis when generating the dynamic unlocking sequence. The historical evacuation data includes the actual evacuation efficiency of each evacuation passage and the personnel passing rate after unlocking of the access control in similar past fire scenarios, and the historical evacuation data is trained through a machine learning model. Meanwhile, when correcting the sequence, the real-time smoke concentration monitoring data is combined to reduce the unlocking priority of the access control corresponding to the evacuation passage covered by smoke. The specific implementation process of the above method is as follows: Firstly, the central control unit receives the fire alarm signal verified through the S1 step, and starts the access control priority algorithm. The algorithm first collects the specific position information of the fire alarm point, and simultaneously retrieves the width parameters of each evacuation passage in the building and the real-time monitored personnel density, taking these information as the initial basis to start building the prototype of the dynamic unlocking sequence. In the process of generating the sequence, the access control priority algorithm synchronously accesses the historical evacuation data for in-depth analysis. The historical evacuation data covers the actual personnel evacuation efficiency of each evacuation passage, the speed of personnel passing after unlocking of the access control and other information in similar past fire scenarios. The algorithm continuously trains these historical data through a machine learning model, so that the generation logic of the dynamic unlocking sequence is more suitable for the actual evacuation characteristics of the building, and the unlocking sequence can better adapt to the evacuation needs under different fire conditions. Subsequently, the central control unit calls the built-in three-dimensional model of the building structure, combines the fire information in the fire alarm signal, and starts the fire spread simulation function. The function simulates the spread speed and possible spread direction of the fire in real time, and corrects the initially generated dynamic unlocking sequence according to the simulation results. If it is predicted that a certain evacuation passage will be blocked by fire in a short time, the central control unit will immediately adjust the sequence and include the standby evacuation access control around the passage in the unlocking range in advance to ensure that personnel can evacuate through alternative paths. At the same time, when correcting the dynamic unlocking sequence, the system will combine the real-time smoke concentration monitoring data. If it is monitored that a certain evacuation passage has been covered by smoke, the access control priority algorithm will automatically reduce the unlocking priority of the access control corresponding to the passage, avoiding personnel from mistakenly entering a dangerous area. Throughout the entire process, the central control unit continuously receives real-time information feedback from each module and continuously fine-tunes the dynamic unlocking sequence. From the construction of the initial sequence, to the optimization based on historical data, and then to the dynamic correction based on fire spread simulation and smoke concentration, a complete dynamic adjustment mechanism is formed, and finally a set of target access control unlocking sequences that can adapt to real-time fire conditions and ensure evacuation efficiency is determined. The sequence is sent to the intelligent control execution module to provide an accurate basis for subsequent access control unlocking operations. During this process, the full log recording module will synchronously record the generation time of the dynamic unlocking sequence, the various parameters involved in the analysis, the adjustment nodes and reasons of the sequence, and other information. It will be classified and stored according to chronological order and module category, and encrypted to ensure that this data is not tampered with, providing a reliable reference for subsequent review and system optimization. S3 intelligent control execution: According to the dynamic unlocking sequence generated in step S2, the central control unit sends an unlocking command to the electromagnetic lock of the target access control. Then, the hierarchical current feedback detection circuit monitors the current changes of the electromagnetic lock coil in real time. When the stable current value reaches the preset unlocking threshold, the state feedback component reports the unlocked status; if it does not reach the threshold, the secondary release mechanism is triggered and the unlocking failure status is reported. The secondary release mechanism first uses a graded current feedback detection circuit to analyze why the electromagnetic lock coil current has not reached the threshold. If it is determined to be mechanical jamming, the vibration auxiliary device will be activated to eliminate the jamming through vibrations of a preset frequency. If it is determined to be insufficient power supply, the power supply voltage will be temporarily increased and the power supply time will be extended. At the same time as the secondary release mechanism is triggered, the status feedback component will send a reminder message to nearby emergency personnel to bring a special unlocking tool. The specific implementation process of the above method is as follows; First, the intelligent unlocking execution module receives the dynamic unlock sequence and corresponding unlocking instructions from the central control unit via a control line. It then transmits the unlocking signal to the electromagnetic locks of the target access points, in the order of priority within the sequence. During this process, the intelligent unlocking execution module's built-in hierarchical current feedback detection circuit is simultaneously activated. This circuit is printed on a double-layer PCB. The sampling resistor and differential amplifier on the top layer accurately capture the current changes in the electromagnetic lock coil, while the ground layer and via array on the bottom layer ensure circuit stability and prevent external interference from affecting detection accuracy. The hierarchical current feedback detection circuit monitors the current changes in the electromagnetic lock coil in real time, tracking the current's progression from initial state to gradual stabilization. When the current stabilizes at the unlocked state that meets preset requirements, the result is immediately transmitted to the status feedback component, which then reports the "unlocked" status to the central control unit and relevant terminals, while also intuitively notifying on-site personnel that the access control system is now accessible. If the grading current feedback detection circuit finds that the stable value of the electromagnetic lock coil current does not reach the preset unlocking threshold, it is determined that the unlocking is unsuccessful, and a secondary release trigger module is triggered. The secondary release trigger module first analyzes the reason why the current does not meet the standard: if it is judged that there is mechanical jamming inside the electromagnetic lock, the vibration auxiliary device is started to eliminate the jamming through vibration of a specific frequency, helping the lock body to restore normal action; if it is judged that insufficient power supply leads to unlocking weakness, the power supply voltage is temporarily increased, and the power supply time is appropriately prolonged to ensure that there is enough power to complete the unlocking; At the same time of triggering the secondary release mechanism, the state feedback component sends prompt information to nearby emergency personnel, clearly informing the access control position that needs to be unlocked, the current fault type, and the recommended special unlocking tool to carry, so that the emergency personnel can arrive at the scene in time for manual auxiliary unlocking. If the secondary release mechanism still fails to unlock, the state feedback component feeds back the "unlocking failure" state, providing a clear basis for subsequent emergency handling; Throughout the process, the whole-process log recording module records the sending time of the unlocking instruction, the current change process of the electromagnetic lock, the state feedback result, the triggering and execution of the secondary release mechanism, and other information, classifies and organizes them in chronological order and module category, and uses encrypted storage to ensure the security and traceability of the records, providing complete data support for system optimization and fault troubleshooting; S4 Anti-interference processing: In the signal transmission process, the differential encoding unit of the anti-interference processing module converts the fire alarm signal into a differential signal, and then the signal enhancement circuit dynamically adjusts the transmission power according to the complexity of the electromagnetic environment. At the same time, through the electromagnetic environment monitoring sensor, the electromagnetic interference frequency and intensity of the surrounding environment are monitored in real time. When strong interference of a specific frequency is detected, the communication mode is automatically switched to frequency hopping mode; The frequency hopping communication mode is provided with an intelligent frequency planning function, that is, based on the historical interference data collected by the electromagnetic environment monitoring sensor, a list of alternative frequencies with strong anti-interference ability is planned in advance. When it is necessary to switch to frequency hopping mode, a frequency that is not currently interfered is selected from the list of alternative frequencies for communication, and the list of alternative frequencies is updated in real time to exclude frequencies that are frequently interfered. The specific implementation process of the above method is as follows: First, the anti-interference processing module is started to work, and the fire alarm signals and unlocking instructions transmitted between the multi-channel signal transmission module and the central control unit are subjected to whole-process anti-interference processing. When the signal enters the anti-interference processing module, the internal differential encoding unit operates first to convert the original fire alarm signal into a differential signal. This conversion utilizes the characteristics of differential signals to effectively resist noise interference in the external environment during transmission, ensuring the basic stability of the signal; During signal transmission, the anti-interference processing module continuously works through the electromagnetic environment monitoring sensor connected by the line, real-time monitors the electromagnetic interference in the surrounding environment, including the frequency characteristics and intensity changes of the interference. The monitored information is transmitted to the signal enhancement circuit in real time, and the signal enhancement circuit dynamically adjusts the transmission power of the signal according to the complexity of the electromagnetic environment. When the environmental interference is weak, the normal power transmission is maintained to reduce energy consumption; when the interference is detected to be enhanced, the power is appropriately increased to ensure the effective coverage of the signal; If the electromagnetic environment monitoring sensor captures strong interference of a specific frequency, and such interference may affect the normal transmission of the signal, the anti-interference processing module will automatically trigger the frequency hopping communication mode. The frequency hopping communication mode relies on the intelligent frequency planning function, which pre-plans a set of alternative frequencies with strong anti-interference capability based on the historical interference data collected by the electromagnetic environment monitoring sensor in the past. When switching to the frequency hopping mode, the system selects a frequency that is not currently interfered from the alternative frequency list for signal transmission, avoiding the influence of interference on the signal; During the frequency hopping communication process, the system will update the alternative frequency list in real time, and exclude those frequencies that are frequently interfered from the list, to ensure that the frequency used later always maintains high anti-interference performance. At the same time, real-time coordination with the receiving end is maintained during the frequency hopping process to ensure that both sides perform signal transmission and reception on the same frequency, avoiding signal interruption caused by frequency switching; During the entire anti-interference processing process, the whole-process log recording module will record the execution of the differential encoding, the adjustment process of the signal transmission power, the electromagnetic environment monitoring results, the triggering time of the frequency hopping mode, and the frequency switching details, etc. These records are classified and arranged according to time sequence and module category, and are stored in an encrypted manner to ensure data security and traceability, providing complete basis for subsequent analysis of interference sources and optimization of anti-interference strategies. Through this series of coherent processing steps, the transmission reliability of the signal in the complex electromagnetic environment is effectively improved, ensuring that the fire alarm signal and the unlocking instruction can be accurately and timely transmitted; S5 Cross-brand adaptation: Through the protocol adaptive conversion module, the brand and model of the access control device are automatically identified, the corresponding communication protocol is matched, and the cross-brand transmission of the unlocking instruction is realized; When the protocol adaptive conversion module automatically identifies the brand and model of the access device, a double identification mechanism is adopted. On the one hand, preliminary identification is performed through the identification information sent by the device, and on the other hand, secondary confirmation is performed by analyzing the communication characteristics of the device, including data transmission rate and frame structure. For unknown brand devices newly connected, the protocol adaptive conversion module automatically starts the temporary adaptation mode, i.e. establishing a basic communication connection first, and then gradually improving the protocol adaptation parameters through continuous communication interaction; During the whole process of steps S1 to S5, a full-process logging module is arranged, the logging module synchronously records the execution time, participating module, data change and result feedback of each operation step, meanwhile, the logging of the logging module adopts an encrypted storage mode, and the logs are classified and arranged according to time sequence and module category.

[0019] Please refer to Figure 2 The fire alarm and access control linkage system adopts the fire alarm and access control linkage method, and comprises: A multi-channel signal transmission module is connected with the fire alarm system through wired and wireless links, and is used for receiving the fire alarm signal. A double-loop verification module is connected with the data interface end of the timestamp synchronization unit through a data line, and is used for comparing the signal content and the timestamp. An intelligent control execution module is connected with the data output end of the central control unit through a control line, and is used for receiving the dynamic unlocking sequence and unlocking instruction sent by the central control unit. A secondary release trigger module is connected with the output end of the hierarchical current feedback detection circuit. An anti-interference processing module is connected with the multi-channel transmission module and the central control unit through a line, and has a differential encoding unit integrated therein. The wired link of the multi-channel signal transmission module adopts an aviation plug and a twisted pair combination structure, the wireless link has an omnidirectional antenna built-in and is packaged in a metal shield, and the crystal oscillator of the timestamp synchronization unit is fixed to the module base through an elastic gasket. The hierarchical current feedback detection circuit of the intelligent control execution module is printed on a double-layer PCB board, the top layer of the double-layer PCB board is arranged with a sampling resistor and a differential amplifier, and the bottom layer of the double-layer PCB board is provided with a ground layer and a via array.

[0020] The scheme improves the response efficiency and signal reliability of the traditional access control system in emergency through multi-channel signal transmission and intelligent verification mechanism, and the multi-channel signal transmission module receives the fire alarm signal through wired and wireless links at the same time, combined with the calibration ability of the time stamp synchronization unit, ensures the real-time and synchronization of signal reception, when the main channel line is damaged or fails due to strong electromagnetic interference caused by fire, the dual-loop verification module can automatically switch to the standby channel, and through comparing the signal content and time stamp information, it can quickly identify and repair abnormal data packets, through seamless switching and double verification mechanism of main and standby channels, the signal interruption or misjudgment problem caused by single channel dependence of traditional system is solved, and the success rate of signal transmission is improved.

[0021] The scheme dynamically simulates the fire spread path through the access control priority algorithm of the central control unit, and generates accurate dynamic unlocking sequence combined with the three-dimensional model of the building structure and real-time environmental data, when it is predicted that a certain evacuation channel will be blocked by fire, the system can unlock the surrounding standby access in advance to avoid delay in escaping due to channel blockage, compared with the traditional fixed unlocking sequence of access control system, this dynamic adjustment strategy based on fire evolution improves the smoothness of evacuation path by a significant margin, at the same time, the differential encoding unit of the anti-interference processing module converts the signal into a differential signal, combined with the signal enhancement circuit and electromagnetic environment monitoring sensor, it can dynamically adjust the transmission power in complex electromagnetic environment, automatically switch to frequency hopping communication mode in strong interference, effectively resist the signal interference in the fire scene, avoid unlocking failure, and the protocol adaptive conversion module set can automatically identify the model of different brands of access control equipment and match the corresponding protocol, without additional hardware modification, it can realize the cooperative work of multi-brand equipment, greatly reduce the system integration cost and maintenance difficulty, solve the problems of unreliable signal transmission and poor compatibility of multi-brand equipment of traditional system, improve the stability and practicality of the system.

[0022] It should be noted that, in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0023] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A fire alarm and access control linkage method, characterized in that: The following steps are involved: S1 signal reception and verification: First, the multi-channel signal transmission module receives fire alarm signals through both wired and wireless channels. Then, the timestamp synchronization unit calibrates the time of each channel signal and compares the signal content with the timestamp information through a dual-loop verification mechanism. If the main channel signal fails, it automatically switches to the backup channel. S2 target access control determination: The central control unit generates a dynamic unlocking sequence using an access control priority algorithm based on the location of the fire alarm point, the width of the evacuation channel, and the density of people. The central control unit also simulates the speed and direction of fire spread in real time using a three-dimensional model of the building structure, making real-time corrections to the dynamic unlocking sequence. If it predicts that an evacuation channel will be blocked by fire within a short period of time, the backup evacuation access control around the corresponding channel will be unlocked in advance. S3 intelligent control execution: According to the dynamic unlocking sequence generated in step S2, the central control unit sends an unlocking command to the electromagnetic lock of the target access control. Then, the hierarchical current feedback detection circuit monitors the current changes of the electromagnetic lock coil in real time. When the stable current value reaches the preset unlocking threshold, the state feedback component feedbacks the unlocked state; If the threshold is not reached, the secondary release mechanism is triggered and the unlocking failure status is fed back; S4 anti-interference processing: During signal transmission, the differential encoding unit of the anti-interference processing module converts the fire alarm signal into a differential signal. The signal enhancement circuit then dynamically adjusts the transmission power according to the complexity of the electromagnetic environment. At the same time, the electromagnetic environment monitoring sensor monitors the frequency and intensity of electromagnetic interference in the surrounding environment in real time. When strong interference at a specific frequency is detected, it automatically switches to frequency hopping communication mode. S5 cross-brand adaptation: The protocol adaptive conversion module automatically identifies the brand and model of the access control device, matches the corresponding communication protocol, and realizes cross-brand transmission of unlocking commands.

2. A fire alarm and access control linkage method according to claim 1, characterized in that: The dual-loop verification mechanism in step S1 also includes a signal integrity verification process. Based on the comparison of signal content and timestamp information, the signal data packet structure is verified section by section to check for data loss, duplication and tampering. When an abnormality is found in the signal, the signal repair program is automatically started to fill the missing part with redundant data. If the repair fails, the third-level early warning mechanism is immediately triggered, and a signal abnormality report is sent to the fire control center.

3. A fire alarm and access control linkage method according to claim 1, characterized in that: When generating a dynamic unlocking sequence, the access control priority algorithm in step S2 simultaneously incorporates historical evacuation data for analysis. The historical evacuation data includes the actual evacuation efficiency of each evacuation channel under similar fire scenarios in the past and the rate of personnel passing through the access control after unlocking. The historical evacuation data is trained through a machine learning model. At the same time, when correcting the sequence, the real-time smoke concentration monitoring data is synchronously combined to lower the unlocking priority of the access control corresponding to the evacuation channel shrouded in smoke.

4. A fire alarm and access control linkage method according to claim 1, characterized in that: The secondary release mechanism in step S3 first analyzes the reason why the current of the electromagnetic lock coil does not reach the threshold through the graded current feedback detection circuit. If it is determined to be mechanical jamming, the vibration auxiliary device is started to eliminate the jamming through vibration of a preset frequency. If it is determined to be insufficient power supply, the power supply voltage is temporarily increased and the power supply time is extended. At the same time as the secondary release mechanism is triggered, the status feedback component sends a reminder message to nearby emergency personnel to bring special unlocking tools.

5. The fire alarm and access control linkage method according to claim 1, characterized in that: The frequency hopping communication mode in step S4 is provided with an intelligent frequency planning function, that is, based on the historical interference data collected by the electromagnetic environment monitoring sensor, an alternative frequency with strong anti-interference ability is pre-planned. When it is necessary to switch to the frequency hopping mode, the currently undisturbed frequency is selected from the alternative frequencies for communication. At the same time, the alternative frequency list is updated in real time to eliminate the frequencies that are frequently interfered with.

6. A fire alarm and access control linkage method according to claim 1, characterized in that: The protocol adaptive conversion module in step S5 adopts a dual identification mechanism when automatically identifying the brand and model of the access device. On the one hand, it performs preliminary identification through the identification information sent by the device, and on the other hand, it performs secondary confirmation by analyzing the communication characteristics of the device, including data transmission rate and frame structure. For newly connected unknown brand devices, the protocol adaptive conversion module automatically starts the temporary adaptation mode, that is, first establishes a basic communication connection, and then gradually improves the protocol adaptation parameters through continuous communication interaction.

7. The fire alarm and access control linkage method according to claim 1, characterized in that: During the entire process of steps S1 to S5, a full-process log recording module is set up, which synchronously records the execution time, participating modules, data changes and result feedback of each operation step. At the same time, the log records of the log recording module are stored in an encrypted manner, and the logs are classified and organized according to chronological order and module category.

8. A fire alarm and access control linkage system, using a fire alarm and access control linkage method according to any one of claims 1 to 7, characterized in that: include: A multi-channel signal transmission module, which is connected to the fire alarm system via wired and wireless links, is used to receive fire alarm signals, and has a timestamp synchronization unit internally disposed therein; A dual-loop verification module is connected to the data interface end of the timestamp synchronization unit via a data line. The dual-loop verification module is used to compare the signal content with the timestamp. The multi-channel signal transmission module is connected to the central control unit via a bus. The central control unit is internally provided with an access control priority algorithm. An intelligent unlocking and control execution module is connected to the data output terminal of the central control unit via a control line. The intelligent unlocking and control execution module is used to receive the dynamic unlocking sequence and unlocking instruction sent by the central control unit. The intelligent unlocking and control execution module includes a hierarchical current feedback detection circuit, which is connected to the electromagnetic lock; A secondary release trigger module is connected to the output end of the hierarchical current feedback detection circuit. The multi-channel transmission module and the central control unit are connected to an anti-interference processing module via a line. The anti-interference processing module is internally integrated with a differential encoding unit, which is used to convert the fire alarm signal into a differential signal; The protocol adaptive conversion module is connected to the data receiving end of the central control unit through the communication interface. The protocol adaptive conversion module is used to automatically identify the brand and model of the access control device and match the corresponding communication protocol.

9. The fire alarm and access control linkage system according to claim 8, characterized in that: The wired link of the multi-channel signal transmission module adopts a combined structure of aviation plug and twisted pair cable. The wireless link has a built-in omnidirectional antenna and is encapsulated in a metal shielding cover. The crystal oscillator of the timestamp synchronization unit is fixed to the module base through an elastic gasket.

10. The fire alarm and access control linkage system according to claim 8, characterized in that: The hierarchical current feedback detection circuit of the intelligent decontrol execution module is printed on a double-layer PCB board. The sampling resistor and the differential amplifier are arranged on the top layer of the double-layer PCB board, and the ground layer and the via array are provided on the bottom layer of the double-layer PCB board.

Images