Smoke sensing false alarm prevention protection fire control system under wind field wind sand environment

Abstract

The present application relates to the field of fire safety technology, and more particularly to a smoke-sensing false alarm prevention protection fire control system in a windy sand environment, comprising: a windy sand environment sensing module for real-time collection of data of the environment at the detection point; a smoke detection module for determining whether to start a high protection mode and collecting original optical scattering signals inside the smoke detector; a particle dynamic characteristic analysis module for analyzing signal fluctuation frequency and amplitude characteristics and extracting particle dynamic characteristic parameters; a protection execution module for generating and executing protection control instructions; and a comprehensive control module for correcting the original optical scattering signals and outputting system-level fire control signals in combination with the current state of the adjustable protection device. The present application can dynamically identify and correct non-smoke particle interference in a windy sand interference environment, realize adaptive linkage of smoke signal false alarm prevention control and fire determination, and improve the detection accuracy and reliability of the system.

Description

Technical Field

[0001] This invention relates to the field of fire safety technology, and in particular to a fire control system for preventing false alarms from smoke detectors in windy and sandy environments. Background Technology

[0002] With the continuous construction of large-scale open-air industrial sites, wind farms, mining areas, transportation hubs, and desertification-edge areas, a large number of fire smoke detection devices are deployed in locations that are constantly exposed to strong winds, blowing sand, and high particulate matter concentrations. In such windy and sandy environments, the air flow is fast and changes direction frequently. The dust particles suspended in the atmosphere are large in size and numerous, making them very easy to enter the air intake channel of the smoke detector under the action of wind and participate in the optical scattering process. This causes significant fluctuations in the optical scattering signal output by the smoke detector. Since conventional smoke detectors usually judge the smoke concentration based on changes in optical scattering intensity, the dust disturbance in this type of environment has a certain similarity to the signal performance of real fire smoke, leading to frequent false alarms even when no real fire occurs, which seriously affects the reliable operation of the fire protection system.

[0003] In existing technologies, most smoke detector false alarm prevention solutions rely on fixed threshold settings, simple time delay judgments, or single sensor data correction methods. These methods struggle to distinguish between transient, strong fluctuations caused by high-speed sandstorm impacts and genuine fire signals generated by the slow diffusion of smoke. While some solutions incorporate mechanical protection or filtering structures, they lack dynamic control and judgment mechanisms that integrate with environmental parameters and particle motion characteristics, making them prone to introducing new judgment biases due to changes in protection status. Therefore, in environments with strong disturbances such as wind farms and sandstorms, there is an urgent need for a smoke detector false alarm prevention and fire control system designed for such environments. This system aims to fundamentally solve the problem of frequent false alarms and improve the accuracy and engineering applicability of fire monitoring in complex environments. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides a smoke detection and false alarm protection fire control system for wind farms and sandstorm environments.

[0005] A smoke detection and false alarm prevention fire control system for windy and sandy environments includes a windy and sandy environment sensing module, a smoke detection module, a particle dynamic characteristic analysis module, a protection execution module, and a comprehensive control module; wherein: Wind and sand environment sensing module: used to collect real-time data on wind speed, wind direction, and atmospheric particulate matter concentration in the environment where the detection point is located, forming a set of environmental parameters; Smoke detection module: used to determine whether to activate the high protection mode based on the environmental parameter set, and to collect the original optical scattering signal inside the smoke detector in the corresponding mode; Particle dynamic feature analysis module: used to receive the original optical scattering signal, analyze the frequency and amplitude characteristics of the signal fluctuation, and extract particle dynamic feature parameters; Protection execution module: used to generate and execute protection control commands based on wind speed, wind direction and particle dynamic characteristic parameters in the environmental parameter set. The protection control commands are used to control the action of the adjustable protection device installed on the air intake channel of the smoke detector, including turning off protection, turning on protection or triggering self-cleaning. Integrated control module: Based on the particle dynamic characteristic parameters, the original optical scattering signal is corrected to obtain the actual smoke concentration value. Combined with the current state of the adjustable protection device, fire logic judgment is performed, and finally, a system-level fire control signal is output.

[0006] Optionally, the wind and sand environment sensing module includes a wind speed and direction sensing unit, a particulate matter concentration sensing unit, and an environmental parameter integration unit; wherein: Wind speed and direction sensing unit: used to collect horizontal wind speed and wind direction angle values ​​in real time by meteorological sensors deployed at the detection point. The wind speed value is the instantaneous average wind speed obtained by the ultrasonic anemometer, and the wind direction angle is the relative angle value output by the sensor. Particulate matter concentration sensing unit: used to invoke laser particle counting sensors deployed around the detection point to collect the concentration of particulate matter per unit volume of air. and Concentration value, expressed in micrograms per cubic meter, represents the suspended density of particulate matter in the area; Environmental parameter integration unit: used to integrate wind speed, wind direction angle, Concentration value and Concentration values ​​are synchronized according to a unified timestamp format to construct a structured set of environmental parameters.

[0007] Optionally, the smoke detection module includes a high-protection mode determination unit and a signal acquisition and execution unit; wherein: High-protection mode determination unit: Used to receive the environmental parameter set output by the wind and sand environment sensing module, and compare the wind speed value in the parameter set with... The concentration value is used for joint judgment; when the wind speed value exceeds the set wind speed threshold. ,and Concentration value exceeds the set particulate matter threshold When needed, activate high protection mode; Signal acquisition and execution unit: used to acquire the raw optical scattering signal inside the smoke detector in the current operating mode; in standard mode, the sampling period is set to a normal value. In high protection mode, the sampling period is switched to the enhanced value. Furthermore, an anti-interference filtering mechanism is enabled, which involves extracting the median value of multiple frames of optical scattering values ​​within each cycle to improve signal stability.

[0008] Optionally, the particle dynamic feature analysis module includes a signal preprocessing unit, a wave frequency analysis unit, a wave amplitude analysis unit, and a feature parameter extraction unit; wherein: Signal preprocessing unit: used to filter and normalize the original optical scattering signal to eliminate DC bias and instantaneous abnormal spikes during the measurement process; The fluctuation frequency analysis unit is used to perform periodic analysis on the preprocessed signal within a set time window, identify the number of optical intensity fluctuations per unit time, and extract frequency feature values ​​reflecting the particle intrusion rate. ; The fluctuation amplitude analysis unit is used to statistically analyze the change in optical intensity between adjacent sampling points. Within a set sliding window, it quantifies the degree of scattering intensity fluctuation caused by particle perturbation and obtains the fluctuation amplitude characteristic value. ; Feature parameter extraction unit: used to integrate the analysis results of fluctuation frequency and fluctuation amplitude to construct a set of particle dynamic feature parameters. The feature parameters are used to reflect the motion characteristics of particle intrusion, including whether it is a rapid high-kinetic-energy sandstorm impact or a slowly changing low-disturbance smoke particle floating behavior.

[0009] Optionally, the feature parameter extraction unit includes: Feature collection subunit: used to receive fluctuation frequency feature values With fluctuation amplitude characteristic value And bind the two with their corresponding time window identifiers to form feature quantity pairs within the same time window; Feature vector construction sub-unit: used to perform uniform scaling on feature pairs, converting fluctuation frequency feature values... With fluctuation amplitude characteristic value Convert to dimensionless features and They are combined in a fixed order to form a particle dynamic feature vector, thus obtaining a set of particle dynamic feature parameters. Motion characteristic discrimination subunit: classifies and judges the motion characteristics of invading particles based on the set of particle dynamic characteristic parameters; when and These are identified as high-energy, fast-moving particles, corresponding to the characteristics of sandstorm impact; when and These are classified as slow-moving, low-disturbance particles, corresponding to the characteristics of smoke aerosols. Discrimination result output sub-unit: Used to output the stable motion characteristic discrimination result together with the corresponding particle dynamic feature vector.

[0010] Optionally, the protection execution module includes a wind field interference assessment unit, a particle disturbance intensity assessment unit, a protection control command generation unit, and a protection device action control unit; wherein: Wind field interference assessment unit: used to receive wind speed and wind direction angle values ​​from the environmental parameter set, and calculate the wind field interference intensity level based on the angle between the wind speed and wind direction relative to the air intake direction of the smoke detector; Particle disturbance intensity assessment unit: used to receive a set of particle dynamic characteristic parameters, extract the average value of the fluctuation frequency and amplitude characteristic values ​​within multiple neighboring time windows, and determine the particle disturbance intensity level according to the preset disturbance discrimination rules, including three categories: high disturbance, medium disturbance and low disturbance; Protection control command generation unit: used to generate protection control commands by combining the wind field interference intensity level and the particle disturbance intensity level; if the wind field interference level is high and the particle disturbance intensity level is high or medium, the protection command is turned on; if the wind field interference level is low and the particle disturbance intensity level is low, the protection command is turned off; if the particle disturbance intensity level remains high for multiple consecutive windows, the self-cleaning command is triggered. Protective device action control unit: used to receive protective control commands and control the action state of the adjustable protective device installed on the air intake channel of the smoke detector; the device is an openable protective structure with an electric drive mechanism. When it receives an open protective command, it performs a channel closing operation; when it receives a close protective command, it performs a channel opening operation; when it receives a self-cleaning trigger command, it starts an additional purging device to perform reverse cleaning of the filter surface or channel opening.

[0011] Optionally, the wind field disturbance assessment unit includes: Wind speed level calculation subunit: used to receive wind speed values ​​from the environmental parameter set. and compared with the wind speed classification threshold set by the system. Comparisons were made, corresponding to low, medium, and high wind speed ranges, to initially mark the current wind speed level; Wind direction angle calculation subunit: used to calculate wind direction angle values Angle of air intake direction of smoke detector Perform the difference calculation to obtain the relative angle. And based on whether the relative angle is within the main interference range. Inside, determine whether the current wind direction constitutes a direct wind inflow; Interference Intensity Level Determination Subunit: Used to determine the wind field interference intensity level by comprehensively considering the current wind speed level and the wind direction angle, according to the following determination rules: If the wind speed level is high and the angle is... If so, the interference intensity level is high; If the wind speed level is medium and the angle is... The interference intensity level is then medium. All other cases were judged to be of low interference intensity level.

[0012] Optionally, the particle disturbance intensity assessment unit includes: Time window selection subunit: used to select multiple consecutive time windows adjacent to the current determination time from the set of particle dynamic characteristic parameters, wherein the number of time windows is set to a fixed value. ; Characteristic mean calculation subunit: used to calculate the mean of continuous features respectively. The mean value of the fluctuation frequency characteristic value and the fluctuation amplitude characteristic value within a time window are calculated to obtain the mean fluctuation frequency characteristic value used for determining the disturbance intensity. With the mean of fluctuation amplitude characteristics ; Disturbance intensity level determination subunit: based on the mean value of fluctuation frequency characteristics With the mean of fluctuation amplitude characteristics Determine the intensity level of particle disturbance; when and When the corresponding preset high disturbance threshold is exceeded, the particle disturbance intensity level is determined to be high disturbance; when and When both are within the preset intermediate threshold range, the particle disturbance intensity level is determined to be medium disturbance; when and At the same time, when the level is lower than the corresponding preset low disturbance threshold, the particle disturbance intensity level is determined to be low disturbance, and the corresponding disturbance intensity level result is output.

[0013] Optionally, the integrated control module includes a scattering signal correction unit, a real smoke concentration calculation unit, a protection status fusion determination unit, and a fire control signal output unit; wherein: Scattering signal correction unit: used to correct the original optical scattering signal based on the particle intrusion disturbance intensity level in the particle dynamic characteristic parameters; when the particle intrusion is determined to have high or medium disturbance characteristics, an interference suppression coefficient is applied to the original optical scattering signal; when the particle intrusion is determined to have low disturbance characteristics, the original optical scattering signal is kept unchanged to obtain the corrected optical scattering signal. Real smoke concentration calculation unit: Calculates the real smoke concentration value based on the corrected optical scattering signal. ; Protection Status Fusion Judgment Unit: Used to receive the actual smoke concentration value and the current status information of the adjustable protection device, and to correct the fire judgment logic based on the protection status; when the adjustable protection device is in the open protection or self-cleaning state, the smoke concentration judgment threshold required for fire judgment is increased; when the adjustable protection device is in the closed protection state, the standard smoke concentration judgment threshold is adopted, thereby avoiding the protection action from misleading the fire judgment result. Fire control signal output unit: used to map the fire judgment result after protection status fusion into system-level fire control signals, and output corresponding control commands according to the judgment result, including normal monitoring signals, fire early warning signals or fire alarm signals.

[0014] Optionally, the protection status fusion determination unit includes: Protection status identification subunit: used to receive the current action status flag of the adjustable protection device in real time, and determine whether it is currently in the protection-on state or in the self-cleaning state; if either state is detected as true, the fire judgment threshold adjustment logic is activated, otherwise the default standard judgment threshold is maintained. Threshold adjustment calculation subunit: used to increase the smoke concentration threshold used for fire detection when active; the preset standard smoke concentration detection threshold is... When the protective device is in active protection or self-cleaning mode, the current concentration judgment threshold is increased to: ,in, This is the threshold adjustment coefficient; Fire detection execution subunit: used to process actual smoke concentration values Compare with the currently effective threshold; if If the threshold is reached, the system is classified as a fire state; otherwise, the system remains in normal monitoring mode and the corresponding fire determination result is output.

[0015] The beneficial effects of this invention are: This invention constructs a multi-level smoke recognition mechanism that combines wind and sand environment perception, particle dynamic feature analysis, and adjustable protection control. It can dynamically identify and correct smoke detection signals in complex environments with high wind speeds and high dust concentrations, solving the problem that traditional smoke detection systems cannot accurately distinguish between wind and sand and smoke, and are prone to false alarms. The system constructs particle dynamic feature parameters by extracting fluctuation frequency and amplitude features, and performs signal correction and disturbance intensity judgment on this basis, thereby improving the recognition accuracy of non-smoke particle interference.

[0016] This invention, by combining the status of protective devices to adjust the fire judgment threshold in real time and introducing a multi-window consistency and self-cleaning mechanism, ensures that false alarms can be suppressed in high interference scenarios and timely responses can be made when real smoke accumulates. This effectively improves the system's anti-interference capability and fire response reliability, and has good engineering practicality and promotion value. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a fire protection control system for preventing false alarms according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the protection execution module in an embodiment of the present invention. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0020] like Figures 1-2 As shown, a smoke detection and false alarm prevention fire control system for windy and sandy environments includes a windy and sandy environment sensing module, a smoke detection module, a particle dynamic characteristic analysis module, a protection execution module, and a comprehensive control module; wherein: Wind and sand environment sensing module: used to collect real-time data on wind speed, wind direction, and atmospheric particulate matter concentration in the environment where the detection point is located, forming a set of environmental parameters; The wind and sand environment sensing module includes a wind speed and direction sensing unit, a particulate matter concentration sensing unit, and an environmental parameter integration unit; among which: Wind speed and direction sensing unit: used to collect horizontal wind speed and wind direction angle values ​​in real time by meteorological sensors deployed at the detection point. The wind speed value is the instantaneous average wind speed obtained by the ultrasonic anemometer, and the wind direction angle is the relative angle value output by the sensor to characterize the direction and intensity of air flow. Particulate matter concentration sensing unit: used to invoke laser particle counting sensors deployed around the detection point to collect the concentration of particulate matter per unit volume of air. and Concentration value, expressed in micrograms per cubic meter, represents the suspended density of particulate matter in the area; Environmental parameter integration unit: used to integrate wind speed, wind direction angle, Concentration value and Concentration values ​​are processed synchronously according to a unified timestamp format to construct a structured environmental parameter set. The above units synchronously collect and structure the wind speed, wind direction and particle concentration parameters. The environmental parameter set can accurately reflect the instantaneous wind and sand interference state of the detection point, providing a unified and stable input basis for subsequent smoke signal acquisition mode switching and particle feature recognition, and improving the dynamic response capability of the system in complex wind and sand environments.

[0021] Smoke detection module: Used to determine whether to activate the high protection mode based on the set of environmental parameters, and to collect the raw optical scattering signal inside the smoke detector in the corresponding mode; The smoke detection module includes a high-protection mode determination unit and a signal acquisition and execution unit; wherein: High-protection mode determination unit: Used to receive the environmental parameter set output by the wind and sand environment sensing module, and compare the wind speed value in the parameter set with... The concentration value is used for joint judgment; when the wind speed value exceeds the set wind speed threshold. ,and Concentration value exceeds the set particulate matter threshold When needed, activate high protection mode; Wind speed threshold Used to determine whether the current environment is under strong wind disturbance, its setting is based on the statistical distribution of wind speed during periods of high dust storm in local historical meteorological data; it is set to 3.5 to 5.0 m / s; once this threshold is exceeded, it indicates that the external wind force may create airflow turbulence inside the detector, causing the risk of dust intrusion. Particulate matter threshold This is used to determine whether the concentration of large particulate matter in the air is sufficient to cause sensor interference. The setting is based on the historical statistical correlation analysis of particulate matter concentration and false alarm rate; specifically, ≥150μg / m³ represents the critical concentration in a sandstorm or dusty environment; it is judged in conjunction with the wind speed threshold, and a dual threshold linkage mechanism is used to avoid false triggering.

[0022] Signal acquisition and execution unit: used to acquire the raw optical scattering signal inside the smoke detector in the current operating mode; in standard mode, the sampling period is set to a normal value. The sampling period is typically 4–6 seconds per frame, suitable for environments with stable conditions and minimal interference. In high-protection mode, the sampling period is switched to the enhanced value. The cycle time is shortened to 1-2 seconds per frame, improving the sensitivity to rapid smoke growth or instantaneous disturbances, making it suitable for complex sandstorm scenarios. An anti-interference filtering mechanism is also enabled, which performs median value extraction on multiple frames of optical scattering values ​​within each cycle, improving signal stability. The median filtering method has a natural suppression effect on short-term spike interference, enabling stable extraction of smoke trend signals. The above units, based on wind speed and PM2.5... 10 The dual-threshold judgment mechanism precisely controls the start and stop of the high protection mode and dynamically adjusts the optical signal acquisition method in different modes, which can significantly improve the system's adaptability to wind and sand interference and the accuracy of smoke signal discrimination, and enhance the overall false alarm prevention performance.

[0023] Particle dynamic feature analysis module: used to receive raw optical scattering signals, analyze the frequency and amplitude characteristics of signal fluctuations, and extract particle dynamic feature parameters; The particle dynamic feature analysis module includes a signal preprocessing unit, a wave frequency analysis unit, a wave amplitude analysis unit, and a feature parameter extraction unit; among which: Signal preprocessing unit: used to filter and normalize the raw optical scattering signal, eliminate DC bias and instantaneous abnormal spikes during the measurement process, and ensure the stability of the signal baseline during subsequent analysis. The fluctuation frequency analysis unit is used to perform periodic analysis on the preprocessed signal within a set time window, identify the number of optical intensity fluctuations per unit time, and extract frequency feature values ​​reflecting the particle intrusion rate. This feature can be used to distinguish between rapidly invading dust particles and slowly diffusing smoke aerosols; the formula for calculating the frequency characteristic value is: ,in, The characteristic value of the fluctuation frequency of the optical scattering signal; This indicates the number of valid fluctuations detected within the time window; Indicates the length of the analysis time window; The fluctuation amplitude analysis unit is used to statistically analyze the change in optical intensity between adjacent sampling points. Within a set sliding window, it quantifies the degree of scattering intensity fluctuation caused by particle perturbation and obtains the fluctuation amplitude characteristic value. The amplitude characteristic value is calculated using the following formula: ,in, The characteristic value representing the average fluctuation amplitude of the optical scattering signal; Indicates the first [number]th ... Optical scattering intensity values ​​at each sampling point; This indicates the number of sampling points within the sliding window; Feature parameter extraction unit: This unit integrates the analysis results of fluctuation frequency and fluctuation amplitude to construct a set of particle dynamic feature parameters. These feature parameters reflect the motion characteristics of particle intrusion, including whether it is a rapid, high-kinetic-energy sandstorm impact or a slowly varying, low-disturbance smoke particle floating behavior. By introducing fluctuation frequency feature values ​​based on time windows and fluctuation amplitude feature values ​​based on adjacent sampling differences during the particle dynamic feature analysis process, this unit can quantitatively characterize the dynamic behavior of intruding particles from two dimensions: the rate of change over time and the magnitude of change in intensity. This provides a stable and distinguishable feature parameter basis for subsequent protection execution decisions and smoke signal correction.

[0024] The feature parameter extraction unit includes: Feature collection subunit: used to receive fluctuation frequency feature values With fluctuation amplitude characteristic value And bind the two with their corresponding time window identifiers to form feature quantity pairs within the same time window; Feature vector construction sub-unit: used to perform uniform scaling on feature pairs, converting fluctuation frequency feature values... With fluctuation amplitude characteristic value Convert to dimensionless features and These parameters are then combined in a fixed order to form a particle dynamic feature vector, resulting in a set of particle dynamic feature parameters. This set consists of particle dynamic feature vectors from multiple consecutive time windows, used to characterize the temporal changes in the particle invasion process. The processing method is as follows: ; ,in, These are the normalized frequency eigenvalues; These are the normalized amplitude eigenvalues; These are the minimum and maximum reference values ​​for the frequency characteristic values ​​in the system; These are the minimum and maximum reference values ​​for the amplitude characteristic values ​​in the system; after normalization, they will be... Constitutes the dynamic characteristic vector of particles; Motion characteristic discrimination subunit: classifies and judges the motion characteristics of invading particles based on the set of particle dynamic characteristic parameters; when and These are identified as high-energy, fast-moving particles, corresponding to the characteristics of sandstorm impact; when and If the particle is identified as a slow, low-disturbance particle, it corresponds to the characteristics of smoke aerosol. If any of the above criteria are not met, the corresponding window will be marked as having unclear characteristics and needs to be further verified by combining the results of multi-window determination. The discrimination result output subunit is used to output the stable motion characteristic discrimination result and the corresponding particle dynamic feature vector. The above unit collects the fluctuation frequency feature value and fluctuation amplitude feature value within a unified time window and constructs a set of particle dynamic feature parameters. At the same time, it introduces a motion characteristic discrimination process based on dual feature thresholds and time sequence consistency verification. It can output stable particle intrusion motion characteristic results with deterministic rules, providing a reliable basis for subsequent protective device action control and smoke signal correction.

[0025] Protection execution module: Used to generate and execute protection control commands based on wind speed, wind direction and particle dynamic characteristic parameters in the environmental parameter set. The protection control commands are used to control the action of the adjustable protection device installed on the air intake channel of the smoke detector, including turning off protection, turning on protection or triggering self-cleaning. The protection execution module includes a wind field interference assessment unit, a particle disturbance intensity assessment unit, a protection control command generation unit, and a protection device action control unit; wherein: Wind field interference assessment unit: used to receive wind speed and wind direction angle values ​​from the environmental parameter set, and calculate the wind field interference intensity level based on the angle between the wind speed and wind direction relative to the air intake direction of the smoke detector; Particle disturbance intensity assessment unit: It is used to receive the set of dynamic characteristic parameters of particles, extract the average value of the fluctuation frequency and amplitude characteristic values ​​within multiple neighboring time windows, and determine the particle disturbance intensity level according to the preset disturbance discrimination rules, including three categories: high disturbance, medium disturbance and low disturbance, to reflect the degree of particle intrusion interference. Protection control command generation unit: used to generate protection control commands by combining the wind field interference intensity level and the particle disturbance intensity level; if the wind field interference level is high and the particle disturbance intensity level is high or medium, the protection command is turned on; if the wind field interference level is low and the particle disturbance intensity level is low, the protection command is turned off; if the particle disturbance intensity level remains high for multiple consecutive windows, the self-cleaning command is triggered. The protective device action control unit receives protective control commands and controls the action status of the adjustable protective device installed on the air intake channel of the smoke detector. The device is an openable protective structure with an electric drive mechanism. When it receives an open protective command, it performs a channel closure operation; when it receives a close protective command, it performs a channel opening operation; when it receives a self-cleaning trigger command, it activates an additional purging device to perform reverse cleaning of the filter surface or channel opening. The unit dynamically controls the state of the air intake channel of the smoke detector by jointly quantifying and evaluating the interference level with wind speed, wind direction and particle characteristic parameters, and introducing a protective control command generation mechanism. This improves the system's adaptability to strong wind and sand disturbances and the detector's self-maintenance capability, effectively reducing the risk of false alarms caused by sand and dust intrusion.

[0026] The wind field disturbance assessment unit includes: Wind speed level calculation subunit: used to receive wind speed values ​​from the environmental parameter set. and compared with the wind speed classification threshold set by the system. The comparisons correspond to low, medium, and high wind speed ranges, respectively, to initially label the current wind speed level. Specifically, low wind speeds <2.0 m / s indicate relatively gentle airflow, making it difficult for dust to enter the smoke detector channel and thus posing little effective interference. Medium wind speeds of 2.0–4.0 m / s correspond to the initial dust transport capacity, which may cause short-term false triggering, especially when there is a large accumulation of surface particles. High wind speeds ≥4.0 m / s indicate that, exceeding this value, the air kinetic energy is sufficient to quickly bring external dust into the detection channel, easily causing abnormal fluctuations in optical scattering values, making it a key area for protection. Wind direction angle calculation subunit: used to calculate wind direction angle values Angle of air intake direction of smoke detector Perform the difference calculation to obtain the relative angle. And based on whether the relative angle is within the main interference range. Inside, determine whether the current wind direction constitutes a direct wind inflow; Interference Intensity Level Determination Subunit: Used to determine the wind field interference intensity level by comprehensively considering the current wind speed level and the wind direction angle, according to the following determination rules: If the wind speed level is high and the angle is... If so, the interference intensity level is high; If the wind speed level is medium and the angle is... The interference intensity level is then medium. All other cases are judged as low interference intensity level; the above sub-units, by introducing wind speed classification judgment and wind direction angle calculation mechanism, and establishing interference intensity judgment rules based on clear interval thresholds, can more accurately identify the positive impact risk of wind field on the air intake channel of smoke detector, thereby providing a stable input basis for the reasonable generation of protection control commands.

[0027] The particle disturbance intensity assessment unit includes: Time window selection sub-unit: used to select multiple consecutive time windows adjacent to the current judgment time from the set of particle dynamic characteristic parameters. The number of time windows is set to a fixed value K, and the selected time windows are guaranteed to be continuous on the time axis to characterize the stable change state of particle intrusion disturbance in a short period of time. Characteristic mean calculation subunit: used to calculate the mean of continuous features respectively. The mean value of the fluctuation frequency characteristic value and the fluctuation amplitude characteristic value within a time window are calculated to obtain the mean fluctuation frequency characteristic value used for determining the disturbance intensity. With the mean of fluctuation amplitude characteristics The calculation method is as follows: ; ,in, This represents the mean of the fluctuation frequency characteristics within the nearest time window; This represents the average fluctuation amplitude characteristic within the nearest time window; and They represent the first The characteristic values ​​of fluctuation frequency and fluctuation amplitude corresponding to each time window; Disturbance intensity level determination subunit: based on the mean value of fluctuation frequency characteristics With the mean of fluctuation amplitude characteristics Determine the intensity level of particle disturbance; when and When the corresponding preset high disturbance threshold is exceeded, the particle disturbance intensity level is determined to be high disturbance; when and When both are within the preset intermediate threshold range, the particle disturbance intensity level is determined to be medium disturbance; when and At the same time, when the level is lower than the corresponding preset low disturbance threshold, the particle disturbance intensity level is determined to be low disturbance, and the corresponding disturbance intensity level result is output.

[0028] Table 1 Preset Disturbance Thresholds The particle disturbance intensity level is determined by the aforementioned preset table. The aforementioned sub-unit introduces a feature mean calculation mechanism of multiple neighboring time windows into the particle dynamic feature parameter set, and outputs the disturbance intensity level based on the deterministic discrimination rule of frequency and amplitude dual features. This can effectively suppress the influence of instantaneous anomalies within a single time window on the judgment result, making the particle disturbance intensity assessment result more stable and reliable, and providing a continuous and consistent decision basis for the generation of subsequent protection and control commands.

[0029] Integrated control module: Based on the particle dynamic characteristic parameters, the original optical scattering signal is corrected to obtain the actual smoke concentration value. Combined with the current status of the adjustable protection device, fire logic judgment is performed, and finally the system-level fire control signal is output. The integrated control module includes a scattered signal correction unit, a real smoke concentration calculation unit, a protection status fusion judgment unit, and a fire control signal output unit; among which: Scattering signal correction unit: used to correct the original optical scattering signal based on the particle intrusion disturbance intensity level in the particle dynamic characteristic parameters; when the particle intrusion is determined to have high or medium disturbance characteristics, an interference suppression coefficient is applied to the original optical scattering signal to weaken the non-smoke scattering component caused by sand and dust impact; when the particle intrusion is determined to have low disturbance characteristics, the original optical scattering signal is kept unchanged to obtain the corrected optical scattering signal. The steps for applying an interference suppression coefficient to the original optical scattering signal are as follows: Suppression coefficient determination: Match the preset interference suppression coefficient according to the disturbance level. The numerical range is This indicates the percentage of the original signal retained; specifically, when there is a high disturbance, The value is 0.4; when it is a medium disturbance, It is 0.7; when it is a low disturbance, It is 1.0; Signal correction execution: For the original optical scattering signal Applying an inhibition coefficient The corrected signal was obtained. : ; Output correction signal: The corrected signal As input to the subsequent unit for calculating actual smoke concentration.

[0030] Real smoke concentration calculation unit: Calculates the real smoke concentration value based on the corrected optical scattering signal. The actual smoke concentration value is obtained according to the following formula: ,in, This represents the actual smoke concentration value; This represents the optical scattering intensity value after processing by the scattering signal correction unit; This represents the smoke concentration calibration coefficient, which is predetermined by the system through a calibration process under conditions of no wind or sand interference. Protection Status Fusion Judgment Unit: Used to receive the actual smoke concentration value and the current status information of the adjustable protection device, and to correct the fire judgment logic based on the protection status; when the adjustable protection device is in the open protection or self-cleaning state, the smoke concentration judgment threshold required for fire judgment is increased; when the adjustable protection device is in the closed protection state, the standard smoke concentration judgment threshold is adopted, thereby avoiding the protection action from misleading the fire judgment result. Fire control signal output unit: This unit maps the fire judgment result after protection status fusion into a system-level fire control signal and outputs corresponding control commands according to the judgment result, including normal monitoring signals, fire early warning signals, or fire alarm signals. By introducing an optical scattering signal correction mechanism based on particle dynamic characteristic parameters into the integrated control module and incorporating the real-time status of adjustable protection devices into the fire logic judgment process, this unit can effectively reduce the interference of non-smoke particles on the detection signal in strong wind and sand disturbance environments, making the calculated smoke concentration closer to the real state, thereby improving the accuracy and reliability of system-level fire control signal output.

[0031] The protection status fusion determination unit includes: Protection status identification subunit: used to receive the current action status flag of the adjustable protection device in real time, and determine whether it is currently in the protection-on state or in the self-cleaning state; if either state is detected as true, the fire judgment threshold adjustment logic is activated, otherwise the default standard judgment threshold is maintained. Threshold adjustment calculation subunit: used to increase the smoke concentration threshold used for fire detection when active; the preset standard smoke concentration detection threshold is... When the protective device is in active protection or self-cleaning mode, to compensate for the attenuation of the scattered signal and the judgment offset caused by air intake blockage or channel disturbance, the current concentration judgment threshold is increased to: ,in, This is the threshold adjustment coefficient, and its value range is... The specific value can be adapted and optimized according to the on-site environment; Fire detection execution subunit: used to process actual smoke concentration values The threshold is compared with the currently effective threshold; the effective threshold is the standard threshold. Or adjusted threshold ,like If the threshold is reached, the system is determined to be in a fire state; otherwise, it maintains the normal monitoring state and outputs the corresponding fire determination result. The above sub-unit introduces a dynamic correction mechanism for the determination threshold based on the action status of the protective device. This enables the system to effectively offset the concentration judgment deviation caused by airflow disturbance, particle obstruction, or changes in channel air resistance during the intervention of the protective device, thereby improving the robustness and accuracy of fire identification and preventing false alarms or missed alarms caused by low thresholds.

[0032] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0033] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A smoke detector-based fire protection control system for windy and sandy environments, characterized in that, It includes a wind and sand environment sensing module, a smoke detection module, a particle dynamic characteristic analysis module, a protection execution module, and a comprehensive control module; among which: Wind and sand environment sensing module: used to collect real-time data on wind speed, wind direction, and atmospheric particulate matter concentration in the environment where the detection point is located, forming a set of environmental parameters; Smoke detection module: used to determine whether to activate the high protection mode based on the environmental parameter set, and to collect the original optical scattering signal inside the smoke detector in the corresponding mode; Particle dynamic feature analysis module: used to receive the original optical scattering signal, analyze the frequency and amplitude characteristics of the signal fluctuation, and extract particle dynamic feature parameters; Protection execution module: used to generate and execute protection control commands based on wind speed, wind direction and particle dynamic characteristic parameters in the environmental parameter set. The protection control commands are used to control the action of the adjustable protection device installed on the air intake channel of the smoke detector, including turning off protection, turning on protection or triggering self-cleaning. Integrated control module: Based on the particle dynamic characteristic parameters, the original optical scattering signal is corrected to obtain the actual smoke concentration value. Combined with the current state of the adjustable protection device, fire logic judgment is performed, and finally, a system-level fire control signal is output.

2. The smoke detector false alarm prevention and fire protection control system for windy and sandy environments according to claim 1, characterized in that, The wind and sand environment sensing module includes a wind speed and direction sensing unit, a particulate matter concentration sensing unit, and an environmental parameter integration unit; wherein: Wind speed and direction sensing unit: used to collect horizontal wind speed and wind direction angle values ​​in real time by meteorological sensors deployed at the detection point. The wind speed value is the instantaneous average wind speed obtained by the ultrasonic anemometer, and the wind direction angle is the relative angle value output by the sensor. Particulate matter concentration sensing unit: used to invoke laser particle counting sensors deployed around the detection point to collect the concentration of particulate matter per unit volume of air. and Concentration value, expressed in micrograms per cubic meter, represents the suspended density of particulate matter in the area; Environmental parameter integration unit: used to integrate wind speed, wind direction angle, Concentration value and Concentration values ​​are synchronized according to a unified timestamp format to construct a structured set of environmental parameters.

3. The smoke detector false alarm prevention and fire protection control system for windy and sandy environments according to claim 1, characterized in that, The smoke detection module includes a high-protection mode determination unit and a signal acquisition and execution unit; wherein: High-protection mode determination unit: Used to receive the environmental parameter set output by the wind and sand environment sensing module, and compare the wind speed value in the parameter set with PM2.

5. 10 The concentration value is used for joint judgment; when the wind speed value exceeds the set wind speed threshold. ,and Concentration value exceeds the set particulate matter threshold When needed, activate high protection mode; Signal acquisition and execution unit: used to acquire the raw optical scattering signal inside the smoke detector in the current operating mode; in standard mode, the sampling period is set to a normal value. In high protection mode, the sampling period is switched to the enhanced value. Furthermore, an anti-interference filtering mechanism is enabled, which involves extracting the median value of multiple frames of optical scattering values ​​within each cycle to improve signal stability.

4. The smoke detector false alarm prevention and fire protection control system for windy and sandy environments according to claim 1, characterized in that, The particle dynamic feature analysis module includes a signal preprocessing unit, a fluctuation frequency analysis unit, a fluctuation amplitude analysis unit, and a feature parameter extraction unit; wherein: Signal preprocessing unit: used to filter and normalize the original optical scattering signal to eliminate DC bias and instantaneous abnormal spikes during the measurement process; The fluctuation frequency analysis unit is used to perform periodic analysis on the preprocessed signal within a set time window, identify the number of optical intensity fluctuations per unit time, and extract frequency feature values ​​reflecting the particle intrusion rate. ; The fluctuation amplitude analysis unit is used to statistically analyze the change in optical intensity between adjacent sampling points. Within a set sliding window, it quantifies the degree of scattering intensity fluctuation caused by particle perturbation and obtains the fluctuation amplitude characteristic value. ; Feature parameter extraction unit: used to integrate the analysis results of fluctuation frequency and fluctuation amplitude to construct a set of particle dynamic feature parameters. The feature parameters are used to reflect the motion characteristics of particle intrusion, including whether it is a rapid high-kinetic-energy sandstorm impact or a slowly changing low-disturbance smoke particle floating behavior.

5. A smoke detector false alarm prevention and fire protection control system for windy and sandy environments according to claim 4, characterized in that, The feature parameter extraction unit includes: Feature collection subunit: used to receive fluctuation frequency feature values With fluctuation amplitude characteristic value And bind the two with their corresponding time window identifiers to form feature quantity pairs within the same time window; Feature vector construction sub-unit: used to perform uniform scaling on feature pairs, converting fluctuation frequency feature values... With fluctuation amplitude characteristic value Convert to dimensionless features and They are combined in a fixed order to form a particle dynamic feature vector, thus obtaining a set of particle dynamic feature parameters. Motion characteristic discrimination subunit: classifies and judges the motion characteristics of invading particles based on the set of particle dynamic characteristic parameters; when and These are identified as high-energy, fast-moving particles, corresponding to the characteristics of sandstorm impact; when and These are classified as slow-moving, low-disturbance particles, corresponding to the characteristics of smoke aerosols. Discrimination result output sub-unit: Used to output the stable motion characteristic discrimination result together with the corresponding particle dynamic feature vector.

6. The smoke detector false alarm prevention and fire protection control system for windy and sandy environments according to claim 1, characterized in that, The protection execution module includes a wind field interference assessment unit, a particle disturbance intensity assessment unit, a protection control command generation unit, and a protection device action control unit; wherein: Wind field interference assessment unit: used to receive wind speed and wind direction angle values ​​from the environmental parameter set, and calculate the wind field interference intensity level based on the angle between the wind speed and wind direction relative to the air intake direction of the smoke detector; Particle disturbance intensity assessment unit: used to receive a set of particle dynamic characteristic parameters, extract the average value of the fluctuation frequency and amplitude characteristic values ​​within multiple neighboring time windows, and determine the particle disturbance intensity level according to the preset disturbance discrimination rules, including three categories: high disturbance, medium disturbance and low disturbance; Protection control command generation unit: used to generate protection control commands by combining the wind field interference intensity level and the particle disturbance intensity level; if the wind field interference level is high and the particle disturbance intensity level is high or medium, the protection command is turned on; if the wind field interference level is low and the particle disturbance intensity level is low, the protection command is turned off; if the particle disturbance intensity level remains high for multiple consecutive windows, the self-cleaning command is triggered. Protective device action control unit: used to receive protective control commands and control the action state of the adjustable protective device installed on the air intake channel of the smoke detector; the device is an openable protective structure with an electric drive mechanism. When it receives an open protective command, it performs a channel closing operation; when it receives a close protective command, it performs a channel opening operation; when it receives a self-cleaning trigger command, it starts an additional purging device to perform reverse cleaning of the filter surface or channel opening.

7. A smoke detector false alarm prevention and fire protection control system for windy and sandy environments according to claim 6, characterized in that, The wind field disturbance assessment unit includes: Wind speed level calculation subunit: used to receive wind speed values ​​from the environmental parameter set. and compared with the wind speed classification threshold set by the system. Comparisons were made, corresponding to low, medium, and high wind speed ranges, to initially mark the current wind speed level; Wind direction angle calculation subunit: used to calculate wind direction angle values Angle of air intake direction of smoke detector Perform the difference calculation to obtain the relative angle. And based on whether the relative angle is within the main interference range. Inside, determine whether the current wind direction constitutes a direct wind inflow; Interference Intensity Level Determination Subunit: Used to determine the wind field interference intensity level by comprehensively considering the current wind speed level and the wind direction angle, according to the following determination rules: If the wind speed level is high and the angle is... If so, the interference intensity level is high; If the wind speed level is medium and the angle is... The interference intensity level is then medium. All other cases were judged to be of low interference intensity level.

8. A smoke detector false alarm prevention and fire protection control system for windy and sandy environments according to claim 7, characterized in that, The particle disturbance intensity assessment unit includes: Time window selection subunit: used to select multiple consecutive time windows adjacent to the current determination time from the set of particle dynamic characteristic parameters, wherein the number of time windows is set to a fixed value K; Characteristic mean calculation subunit: used to calculate the mean of continuous features respectively. The mean value of the fluctuation frequency characteristic value and the fluctuation amplitude characteristic value within a time window are calculated to obtain the mean value of the fluctuation frequency characteristic value used for determining the disturbance intensity. With the mean of fluctuation amplitude characteristics ; Disturbance intensity level determination subunit: based on the mean value of fluctuation frequency characteristics With the mean of fluctuation amplitude characteristics Determine the intensity level of particle disturbance; when and When the corresponding preset high disturbance threshold is exceeded, the particle disturbance intensity level is determined to be high disturbance; when and When the particle disturbance intensity level is within the preset intermediate threshold range, it is determined to be a medium disturbance; when and At the same time, when the level is lower than the corresponding preset low disturbance threshold, the particle disturbance intensity level is determined to be low disturbance, and the corresponding disturbance intensity level result is output.

9. A smoke detector false alarm prevention and fire protection control system for windy and sandy environments according to claim 1, characterized in that, The integrated control module includes a scattering signal correction unit, a real smoke concentration calculation unit, a protection status fusion judgment unit, and a fire control signal output unit; wherein: Scattering signal correction unit: used to correct the original optical scattering signal based on the particle intrusion disturbance intensity level in the particle dynamic characteristic parameters; when the particle intrusion is determined to have high or medium disturbance characteristics, an interference suppression coefficient is applied to the original optical scattering signal; when the particle intrusion is determined to have low disturbance characteristics, the original optical scattering signal is kept unchanged to obtain the corrected optical scattering signal. Real smoke concentration calculation unit: Calculates the real smoke concentration value based on the corrected optical scattering signal. ; Protection Status Fusion Judgment Unit: Used to receive the actual smoke concentration value and the current status information of the adjustable protection device, and to correct the fire judgment logic based on the protection status; when the adjustable protection device is in the open protection or self-cleaning state, the smoke concentration judgment threshold required for fire judgment is increased; when the adjustable protection device is in the closed protection state, the standard smoke concentration judgment threshold is adopted, thereby avoiding the protection action from misleading the fire judgment result. Fire control signal output unit: used to map the fire judgment result after protection status fusion into system-level fire control signals, and output corresponding control commands according to the judgment result, including normal monitoring signals, fire early warning signals or fire alarm signals.

10. A smoke detector false alarm prevention and fire protection control system for windy and sandy environments according to claim 1, characterized in that, The protection status fusion determination unit includes: Protection status identification subunit: used to receive the current action status flag of the adjustable protection device in real time, and determine whether it is currently in the protection-on state or in the self-cleaning state; if either state is detected as true, the fire judgment threshold adjustment logic is activated, otherwise the default standard judgment threshold is maintained. Threshold adjustment calculation subunit: used to increase the smoke concentration threshold used for fire detection when active; the preset standard smoke concentration detection threshold is... When the protective device is in active protection or self-cleaning mode, the current concentration judgment threshold is increased to: ,in, This is the threshold adjustment coefficient; Fire detection execution subunit: used to process actual smoke concentration values Compare with the currently effective threshold; if If the threshold is reached, the system is classified as a fire state; otherwise, the system remains in normal monitoring mode and the corresponding fire determination result is output.

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