A system and method for accurately calibrating sensitivity of a smoke fire detector

Abstract

The application discloses a system and method for accurately calibrating sensitivity of a smoke fire detector, relates to the technical field of detector sensitivity calibration, and solves the technical problem that a high-concentration smoke needs to be used to calibrate the sensitivity of the detector, so that the standard detector is easily polluted during the consistency setting of the sensitivity of the smoke fire detector; the application starts the detection device, preliminarily sets the target detector, obtains the calibration time and the detection value sequence of each standard detector, analyzes the equipment based on the detection value sequence, and sends an operation instruction; the calibration coefficient of each detector to be measured is obtained based on the operation instruction, and the consistency of each detector to be measured is processed based on the calibration coefficient; in the sensitivity calibration, the application does not use high-concentration smoke, reduces the pollution speed of the standard detector, and also reduces the pollution of the atmospheric environment caused by the calibration operation.

Description

Technical Field

[0001] This invention belongs to the field of fire safety and relates to detector sensitivity calibration technology, specifically a system and method for accurately calibrating the sensitivity of smoke detectors. Background Technology

[0002] With the acceleration of urbanization and the continuous increase in building height, fire safety has become a major social concern. Photoelectric smoke detectors, as a type of smoke detector, are an important component of fire early warning systems, and their accuracy directly affects the safety of people's lives and property. The basic structure and principle of a photoelectric smoke detector is that a set of optical signal transmitting and receiving tubes are installed within an optical labyrinth. When smoke particles in the air enter the detector labyrinth, the light rays within the labyrinth are scattered and illuminate the photoelectric tubes, thereby generating an electrical signal with an amplitude positively correlated with the smoke concentration. However, due to unavoidable differences in the electrical parameters of the transmitting and receiving tubes, as well as their installation positions, the sensitivity of the detectors can vary, seriously affecting product consistency and reliability.

[0003] Currently, the standardization of sensitivity settings for smoke detectors involves installing the detector under test and a standard detector in a smoke chamber, adding smoke to the chamber, and then calibrating and correcting the sensitivity of the detector under test by comparing their responses to the smoke. However, this method uses a relatively low sensitivity setting to improve the detector's resistance to interference from moisture, dust, and other substances. Therefore, calibrating the detector sensitivity requires a high concentration of smoke, which makes the standard detector susceptible to contamination and makes it difficult to ensure the uniformity of the smoke during calibration.

[0004] Therefore, the present invention provides a system and method for accurately calibrating the sensitivity of smoke detectors to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a system and method for accurately calibrating the sensitivity of smoke detectors. This addresses the technical problem that, in setting the sensitivity of smoke detectors for consistency, a high concentration of smoke is required for calibration, leading to the easy contamination of standard detectors. This invention solves the aforementioned problem by activating the detection device and initially setting the target detector, obtaining the calibration time and the detection value sequence of each standard detector, analyzing the device based on the detection value sequence, issuing operation commands, obtaining the calibration coefficients of each detector under test based on the operation commands, and performing consistency processing on each detector under test based on the calibration coefficients.

[0006] To achieve the above objectives, a first aspect of the present invention provides a system for accurately calibrating the sensitivity of a smoke detector, comprising: an intelligent analysis module, and a preliminary setting module, a data correction module, and a database connected thereto;

[0007] The preliminary setup module is used to start the detection device and perform preliminary settings on the target detector; wherein the target detector includes a standard detector and a detector under test, and the preliminary settings include detection sensitivity settings and background value initialization settings;

[0008] The intelligent analysis module is used to acquire the calibration time and the detection value sequence of each standard detector, analyze the equipment based on the detection value sequence, and issue operation commands; wherein, the operation commands include operation command one, operation command two, and operation command three;

[0009] The data correction module is used to obtain the calibration coefficients of each detector under test based on the operation instructions, and to perform consistency processing on each detector under test based on the calibration coefficients.

[0010] Preferably, the activation of the detection device and the initial setup of the target detector include:

[0011] Open the exhaust valve to expel the smoke from the smoke box, and push the load vehicle equipped with the detector to be tested into the smoke box.

[0012] The controller sets the detection sensitivity of the standard detector and the detector under test to α times the normal detection sensitivity via a broadcast command; where α is a manually set proportional adjustment coefficient greater than 1.

[0013] The controller initializes the background value settings for the standard detector and the detector under test via broadcast commands;

[0014] Close the exhaust valve, start the fan, and add smoke into the smoke box.

[0015] It should be noted that adding smoke refers to placing a certain number of lit incense sticks or cotton ropes into the smoke-adding trough, so that the smoke concentration in the smoke box gradually and evenly increases.

[0016] It should be noted that setting the detection sensitivity to α times the normal detection sensitivity can improve the detector's ability to detect smoke.

[0017] Preferably, the initialization of the background value setting for the standard detector and the detector under test includes:

[0018] A1: Combine the detection values ​​of the same standard detector under smoke-free conditions into group W1, and combine the detection values ​​of the same detector under test under smoke-free conditions into group W2. Extract feature values ​​from groups W1 and W2. Determine whether the feature values ​​of group W1 or group W2 exceed the corresponding standard range. If yes, remove the detection value in the group with the largest difference from the mode of the group, and re-extract feature values ​​from the group until the feature values ​​of the group do not exceed the corresponding standard range, then jump to A2; otherwise, jump to A2.

[0019] A2: Use the characteristic values ​​of each W1 group as the background values ​​of the corresponding standard detector. S i The characteristic values ​​of each W2 group are used as the background value B of the corresponding detector under test. T h Where i is the serial number of the standard detector and h is the serial number of the detector under test. The standard range is obtained by manual setting.

[0020] It should be noted that S and T are used to distinguish between the standard detector and the detector under test. S represents the standard detector and T represents the detector under test.

[0021] Preferably, the feature value extraction of groups W1 and W2 includes:

[0022] Extract the mean PJ1, mode Z1, and percentage BS1 from group W1. Obtain the characteristic value TZ1 of group W1 based on the formula TZ1=(β1×Z1+β2×BS1+PJ1) / 2; where β1 and β2 are both proportional adjustment coefficients greater than 0, and β1+β2=1, β1≥β2;

[0023] Extract the mean PJ2, mode Z2, and percentage BS2 from group W2. Obtain the characteristic value TZ2 of group W2 based on the formula TZ2=(δ1×Z2+δ2×BS2+PJ2) / 2. Here, δ1 and δ2 are both proportional adjustment coefficients greater than 0, and δ1+δ2=1, δ1≥δ2; the percentile of the percentage is obtained manually.

[0024] Preferably, the acquisition of the calibration time and the detection value sequence of each standard detector includes:

[0025] B1: The host computer acquires the real-time detection value V from the standard detector. S ij For the real-time detection value V S ij Outlier removal is performed, retaining the real-time detection value V. S ij The corresponding number of standard detectors is marked as N, and the latest real-time detection value V will be retained. S ij Marked as VS i Based on the formula CL=∑(V S i -B S i The detection value increment CL is obtained by dividing N by 1. It is then determined whether the detection value increment CL is less than the calibrated threshold. If yes, the real-time detection value V of the standard detector is continued to be acquired. S ij The system then acquires the detection value increment CL until the detection value increment CL is not less than the calibration threshold, at which point it jumps to B2; otherwise, it jumps to B2. Here, j is the detection order, and the calibration threshold is obtained by manual setting. The summation symbol ∑ has a value range of [1, N].

[0026] B2: The real-time detection value V corresponding to the detection value increment CL being not less than the calibrated threshold. S ij The acquired time stamp is designated as the calibration time, and the real-time detection value V acquired at the calibration time is used as the calibration time. S ij Marked as C S i The detection value sequence of each standard detector is labeled as S. i S i =[V S i1 V S i2 ,…,C S i ].

[0027] Preferably, the real-time detection value V S ij Outlier removal includes:

[0028] Extract several real-time detection values ​​V S ij The variance is used to determine whether it exceeds a variance threshold; if so, several real-time detection values ​​V are obtained. S ij The mode, after removing some real-time detection values ​​V S ij The real-time detection value V that differs most from the mode S ij Then, the variance is re-evaluated until the variance does not exceed the variance judgment threshold, at which point the remaining real-time detection value V is retained. S ij No, retain several extracted real-time detection values ​​V. S ij The variance determination threshold is obtained empirically.

[0029] Preferably, the step of analyzing the device based on the detection value sequence and issuing operation instructions includes:

[0030] C1: Sequentially extract the detection value sequence S of each standard detector. i The detection value sequence S i The values ​​are plotted on the ordinate, and the detection order j is plotted on the abscissa. Smoke rise curves for each standard detector are constructed using interpolation. The linearity and slope of the smoke rise curves are obtained. The detection value sequence S of each standard detector is then plotted. i The corresponding slopes are integrated into a slope group, the standard deviation of the slope group is obtained, and it is determined whether the standard deviation exceeds a preset range; if yes, operation command one is issued; if no, jump to C2.

[0031] C2: Determine whether the linearity and slope of each standard detector exceed the corresponding judgment range; if yes, issue operation command two; if no, issue operation command three; where the preset range and judgment range are obtained through experience.

[0032] Preferably, the step of obtaining the calibration coefficients of each detector under test based on the operation command includes:

[0033] D1: Extract the operation command and determine if the extracted operation command is operation command one; if yes, issue a warning message that some standard detectors are severely aging and stop subsequent operations; if no, jump to D2;

[0034] D2: Determine if the extracted operation instruction is operation instruction two; if yes, issue an early warning message that the current smoke addition process is abnormal, and return to start the detection device and recalibrate; if no, jump to D3;

[0035] D3: Extract the retained real-time detection value V S ij The background value B of the corresponding standard detector S i And the corresponding detection value C of the standard detector at the calibration time. S i The background value B of the detector under test T h The detection value C of the detector under test at the calibration time. T h Based on formula ZS T h =(C T h -B T h ) / (∑(C S i -B S i The calibration coefficient ZS of each detector under test is obtained by () / N).T h The summation symbol ∑ has a range of values ​​[1, N].

[0036] Preferably, the consistency processing of each detector under test based on the calibration coefficient includes:

[0037] Obtain the standard deviation of the calibration coefficient ZS of each detector under test, and determine whether the standard deviation exceeds the standard deviation range; if yes, issue a reminder to check the materials or assembly process; if no, reset the calibration coefficient ZS of each detector under test. T h The commands are sent separately to the corresponding detectors under test, setting both the standard detector and the detector under test to their normal detection sensitivity. A broadcast command is then used to initialize the background values ​​of both the standard detector and the detector under test. When the detector under test is operating normally, the values ​​are based on the formula BV. T h =(V T h -B T h ) / ZS T h Obtain the corrected increment BV T h Determine the correction increment BV during detector detection. T h Is it greater than the incremental threshold? Yes, it indicates a fire alarm; no, it indicates no fire alarm. Where V... T h The real-time detection values ​​of each detector under test are represented by the incremental threshold, which is obtained through empirical setting.

[0038] A second aspect of the present invention provides a method for accurately calibrating the sensitivity of a smoke detector, comprising the following steps:

[0039] S1: Start the detection device and perform preliminary settings for the target detector;

[0040] S2: Obtain the calibration time and the detection value sequence of each standard detector, analyze the equipment based on the detection value sequence and issue operation commands;

[0041] S3: Obtain the calibration coefficients of each detector under test based on the operation instructions, and perform consistency processing on each detector under test based on the calibration coefficients.

[0042] Compared with the prior art, the beneficial effects of the present invention are:

[0043] 1. This invention solves the technical problem that in setting the sensitivity of smoke detectors, a high concentration of smoke is needed to calibrate the detector sensitivity, leading to easy contamination of the standard detectors. The invention eliminates the need for high-concentration smoke in sensitivity calibration, reducing the rate of contamination of the standard detectors and decreasing the maintenance frequency of components such as the standard detectors. It also reduces atmospheric pollution during calibration.

[0044] 2. This invention ensures the standardization of the calibration process by detecting the linearity and slope of the smoke rise curves of each standard detector. By detecting the standard deviation of the slope group, the status of the standard detectors can be detected in real time, which can ensure the stability of the data and the reliability of the calibration results.

[0045] 3. The calibration coefficients obtained by this invention are derived by analyzing the detection values ​​of each detector under test at the calibration time. This allows for personalized calibration coefficients based on the differences between each detector product. Then, standard detection values ​​for each detector are obtained based on these calibration coefficients. The detector sensitivity can be dynamically adjusted based on these standard detection values. Furthermore, this invention allows for the use of low-concentration smoke to calibrate the sensitivity of the detector under test. This allows for the slow addition of smoke during calibration, providing favorable conditions for uniform smoke diffusion and improving calibration accuracy. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the operation steps of the present invention;

[0048] Figure 2 This is a schematic diagram of the system modules of the present invention;

[0049] Figure 3 This is a schematic diagram illustrating the operation steps for obtaining calibration coefficients according to the present invention;

[0050] Figure 4 This is a diagram of the detection device of the present invention. Detailed Implementation

[0051] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] Please see Figures 1-2 The first aspect of the present invention provides a system for accurately calibrating the sensitivity of a smoke detector, comprising: an intelligent analysis module, and a preliminary setting module, a data correction module and a database connected thereto;

[0053] Preliminary setup module: used to start the detection device and perform preliminary settings for the target detector; the target detector includes a standard detector and a detector under test, and the preliminary settings include detection sensitivity settings and background value initialization settings;

[0054] Intelligent analysis module: used to acquire the calibration time and the detection value sequence of each standard detector, analyze the equipment based on the detection value sequence and issue operation commands; among which, operation commands include operation command one, operation command two and operation command three;

[0055] Data correction module: used to obtain the calibration coefficients of each detector under test based on the operation instructions, and to perform consistency processing on each detector under test based on the calibration coefficients.

[0056] Please see Figure 4 The detection device includes a smoke box 1, a standard detector 2, a controller 3, a host computer 4, and a load vehicle 5;

[0057] The specific specifications are as follows: The bottom of the smoke box is equipped with a smoke trough for placing lit incense sticks, cotton ropes, etc.; several fans are installed inside the smoke box to evenly distribute the smoke; the smoke box is equipped with an exhaust valve, which is closed during calibration to ensure the smoke box's airtightness, and opened after calibration to remove smoke and prepare for the next calibration; the load cart is used to install the detectors under test and can be pushed into the smoke box for batch calibration of detectors; the controller communicates with the standard detectors and the detectors under test via the fire alarm system's bus and with the host computer via a serial port.

[0058] It should be noted that a standard detector refers to a detector that has been tested with standard instruments and whose response threshold is within a specific range, and is installed in a specific location inside the smoke box.

[0059] The activation of the detection device and the initial setup of the target detector in this application include:

[0060] Open the exhaust valve to expel the smoke from the smoke box, and push the load vehicle equipped with the detector to be tested into the smoke box.

[0061] The controller sets the detection sensitivity of the standard detector and the detector under test to α times the normal detection sensitivity via a broadcast command; where α is a manually set proportional adjustment coefficient greater than 1.

[0062] The controller initializes the background value settings for the standard detector and the detector under test via broadcast commands;

[0063] Close the exhaust valve, start the fan, and add smoke into the smoke box.

[0064] It should be noted that the broadcast command is used to achieve "one-to-many" communication. All standard detectors and detectors under test on the bus will perform the corresponding operations after receiving the command.

[0065] It should be noted that the detection sensitivity setting refers to improving the detector's ability to detect smoke by increasing the current driving the transmitting tube or increasing the amplification factor of the signal processing circuit of the receiving tube.

[0066] It should be noted that the controller communicates with standard detectors and detectors under test through the bus of the automatic fire alarm system, and communicates with the host computer through a serial port.

[0067] It should be noted that adding smoke refers to placing a certain number of lit incense sticks or cotton ropes into the smoke-adding trough, so that the smoke concentration in the smoke box gradually and evenly increases.

[0068] It should be noted that setting the detection sensitivity to α times the normal detection sensitivity can improve the detector's ability to detect smoke.

[0069] This application initializes the background values ​​for both the standard detector and the detector under test, including:

[0070] A1: Combine the detection values ​​of the same standard detector under smoke-free conditions into group W1, and combine the detection values ​​of the same detector under test under smoke-free conditions into group W2. Extract feature values ​​from groups W1 and W2. Determine whether the feature values ​​of group W1 or group W2 exceed the corresponding standard range. If yes, remove the detection value in the group with the largest difference from the mode of the group, and re-extract feature values ​​from the group until the feature values ​​of the group do not exceed the corresponding standard range, then jump to A2; otherwise, jump to A2.

[0071] A2: Use the characteristic values ​​of each W1 group as the background values ​​of the corresponding standard detector. S i The characteristic values ​​of each W2 group are used as the background value B of the corresponding detector under test. T h Where i is the serial number of the standard detector and h is the serial number of the detector under test. The standard range is obtained by manual setting.

[0072] It should be noted that S and T are used to distinguish between the standard detector and the detector under test. S represents the standard detector and T represents the detector under test.

[0073] This application performs feature value extraction on groups W1 and W2, including:

[0074] Extract the mean PJ1, mode Z1, and percentage BS1 from group W1. Obtain the characteristic value TZ1 of group W1 based on the formula TZ1=(β1×Z1+β2×BS1+PJ1) / 2; where β1 and β2 are both proportional adjustment coefficients greater than 0, and β1+β2=1, β1≥β2;

[0075] Extract the mean PJ2, mode Z2, and percentage BS2 from group W2. Obtain the characteristic value TZ2 of group W2 based on the formula TZ2=(δ1×Z2+δ2×BS2+PJ2) / 2. Here, δ1 and δ2 are both proportional adjustment coefficients greater than 0, and δ1+δ2=1, δ1≥δ2; the percentile of the percentage is obtained manually.

[0076] It is worth noting that the present invention uses percentiles when calculating feature values. This value is added because: the system can set different percentiles according to the needs of the device, so that the obtained feature values ​​can be adapted to different devices, increasing the flexibility of the system; at the same time, there may be outliers or isolated points in the data set, which may have a significant impact on statistical quantities such as the mean. Using percentiles can reduce the interference of these outliers and improve the accuracy of the system analysis.

[0077] It should be noted that in this invention, percentile BS1 or percentile BS2 refers to the value at a specific percentile in each group. If the data in each group is sorted from smallest to largest, and the manually set percentile is 60%, then the data at the 60% position in each group is the percentile of that group. If there is no data at the 60% position in a group, then the data closest to the 60% position is taken as the percentile of that group.

[0078] This application obtains the calibration time and the detection value sequence of each standard detector, including:

[0079] B1: The host computer acquires the real-time detection value V from the standard detector. S ij For the real-time detection value V S ij Outlier removal is performed, retaining the real-time detection value V. S ij The corresponding number of standard detectors is marked as N, and the latest real-time detection value V will be retained. S ij Marked as VS i Based on the formula CL=∑(V S i -B S i The increment CL of the detected value is obtained by dividing the result by N. It is then determined whether the increment CL is less than the calibrated threshold. If so, the real-time detected value V from the standard detector is continued to be acquired. S ij The system then acquires the detection value increment CL until the detection value increment CL is not less than the calibration threshold, at which point it jumps to B2; otherwise, it jumps to B2. Here, j is the detection order, and the calibration threshold is obtained by manual setting. The summation symbol ∑ has a value range of [1, N].

[0080] B2: The real-time detection value V corresponding to the detection value increment CL being not less than the calibrated threshold. S ij The acquired time stamp is designated as the calibration time, and the real-time detection value V acquired at the calibration time is used as the calibration time. S ij Marked as C S i The detection value sequence of each standard detector is labeled as S. i S i =[V S i1 V S i2 ,…,C S i ].

[0081] It should be noted that the host computer is used to control the calibration process, calculate and save the calibration result data.

[0082] In this application, the real-time detection value V is... S ij Outlier removal includes:

[0083] Extract several real-time detection values ​​V S ij The variance is used to determine whether it exceeds the variance threshold; if so, several real-time detection values ​​V are obtained. S ij The mode, after removing some real-time detection values ​​V S ij The real-time detection value V that differs most from the mode S ij Then, the variance is re-evaluated until the variance does not exceed the variance judgment threshold, at which point the remaining real-time detection value V is retained. S ij No, retain several extracted real-time detection values ​​V. S ijThe variance determination threshold is obtained empirically.

[0084] It is worth noting that the present invention has advantages in real-time detection value V. S ij In the outlier removal process, a variance-based method was used. The variance was used to determine whether there were any large fluctuations in the current data. If such large fluctuations were found, they were removed and the remaining data was retained. This operation ensures the stability of the retained data and can significantly reduce the impact of outliers on the overall dataset, thereby improving the accuracy and reliability of the data.

[0085] This application analyzes the device based on the sequence of detected values ​​and issues operation commands, including:

[0086] C1: Sequentially extract the detection value sequence S of each standard detector. i The detection value sequence S i The values ​​are plotted on the ordinate, and the detection order j is plotted on the abscissa. Smoke rise curves for each standard detector are constructed using interpolation. The linearity and slope of the smoke rise curves are obtained. The detection value sequence S of each standard detector is then plotted. i The corresponding slopes are integrated into a slope group, the standard deviation of the slope group is obtained, and it is determined whether the standard deviation exceeds the preset range; if yes, operation instruction one is issued; if no, jump to C2.

[0087] C2: Determine whether the linearity and slope of each standard detector exceed the corresponding judgment range; if yes, issue operation command two; if no, issue operation command three; where the preset range and judgment range are obtained through experience.

[0088] It is worth noting that this invention ensures the standardization of the calibration process by detecting the linearity and slope of the smoke rise curves of each standard detector. By detecting the standard deviation of the slope group in real time, the status of the standard detector can be detected, which can ensure the stability of the data and the reliability of the calibration results.

[0089] Please see Figure 3 In this application, the calibration coefficients of each detector under test are obtained based on the operation instructions, including:

[0090] D1: Extract the operation command and determine if the extracted operation command is operation command one; if yes, issue a warning message that some standard detectors are severely aging and stop subsequent operations; if no, jump to D2;

[0091] D2: Determine if the extracted operation instruction is operation instruction two; if yes, issue an early warning message that the current smoke addition process is abnormal, and return to start the detection device and recalibrate; if no, jump to D3;

[0092] D3: Extract the retained real-time detection value VS ij The background value B of the corresponding standard detector S i And the corresponding detection value C of the standard detector at the calibration time. S i The background value B of the detector under test T h The detection value C of the detector under test at the calibration time. T h Based on formula ZS T h =(C T h -B T h ) / (∑(C S i -B S i The calibration coefficient ZS of each detector under test is obtained by () / N). T h The summation symbol ∑ has a range of values ​​[1, N].

[0093] It is worth noting that the calibration coefficients obtained by this invention are obtained by analyzing the detection values ​​of each detector under test at the calibration time. The calibration coefficients can be obtained in a personalized manner according to the differences of each detector under test product. Then, the standard detection values ​​of each detector under test are obtained based on the calibration coefficients. This invention allows for the use of low-concentration smoke to calibrate the sensitivity of the detector under test, so that the smoke can be added slowly during the calibration process, which provides favorable conditions for uniform smoke diffusion and improves the accuracy of calibration.

[0094] It is worth noting that, since this invention does not require the use of high-concentration smoke, it reduces the pollution rate of the standard detector, reduces the maintenance frequency of components such as the standard detector, and also reduces the pollution of the atmospheric environment caused by calibration operations.

[0095] It should be noted that in step D2, when the extracted operation instruction is operation instruction two, an early warning message of abnormality in the current smoke addition process is issued, and the process returns to start the detection device and recalibrate. Here, returning to start the detection device and recalibrate means returning to the preliminary setting module to restart the detection device and perform preliminary settings and subsequent operations on the target detector.

[0096] It should be noted that when the extracted operation instruction in step D1 is not operation instruction one, the process jumps to D2. Therefore, the operation instruction analyzed in step D2 is operation instruction two or operation instruction three. When the extracted operation instruction in step D2 is not operation instruction two, the process jumps to D3. This indicates that step D3 is the specific processing step for operation instruction three, and when operation instruction three is received, the calibration coefficients of each detector under test are obtained.

[0097] In this embodiment, if the background value B of the detector under test with serial number 1 is... T 1 = 12, the detected value C at the calibration time. T 1 = 82;

[0098] The background value B of the detector under test with serial number 2 T 2 = 18, the measured value C at the calibration time. T 2 = 90;

[0099] The background value B of the standard detector with serial number 1 S 1 = 10, the measured value C at the calibration time S 1 = 80;

[0100] The background value B of the standard detector with serial number 2 S 2 = 15, the detected value C at the calibration time. S 2 = 100;

[0101] The background value B of the standard detector with serial number 3 S 3 = 18, the measured value C at the calibration time. S 3 = 85;

[0102] Therefore, the calibration coefficient ZS of the detector under test with serial number 1 is... T 1 = (C T 1-B T 1) / (∑(C S i -B S i ) / N)=(82-12) / (((80-10)+(100-15)+(85-18)) / 3)=0.9459;

[0103] Calibration coefficient ZS for detector under test, serial number 2 T 2=(C T 2-B T 2) / (∑(C S i -B S i ) / N)=(90-18) / (((80-10)+(100-15)+(85-18)) / 3)=0.9729.

[0104] This application performs consistency processing on each detector under test based on calibration coefficients, including:

[0105] Obtain the standard deviation of the calibration coefficient ZS of each detector under test, and determine whether the standard deviation exceeds the standard deviation range; if yes, issue a reminder to check the materials or assembly process; if no, reset the calibration coefficient ZS of each detector under test. T h The commands are sent separately to the corresponding detectors under test, setting both the standard detector and the detector under test to their normal detection sensitivity. A broadcast command is then used to initialize the background values ​​of both the standard detector and the detector under test. When the detector under test is operating normally, the values ​​are based on the formula BV. T h =(V T h -B T h ) / ZS T h Obtain the corrected increment BV T h Determine the correction increment BV during detector detection. T h Is it greater than the incremental threshold? Yes, it indicates a fire alarm; no, it indicates no fire alarm. Where V... T h The real-time detection values ​​of each detector under test are represented by the incremental threshold, which is obtained through empirical setting.

[0106] It should be noted that the standardization process can be understood as: using the obtained calibration coefficient ZS to correct the detector's detection value increment, so that each detector can alarm with the same sensitivity; if no correction is made, the detectors may alarm for the same concentration of smoke, while others may not, meaning that the detectors' sensitivity will vary. The goal of calibration is to adjust the detectors' sensitivity to be the same. When the detector is working normally, its task is to detect whether there is fire smoke in the environment.

[0107] A second aspect of the present invention provides a method for accurately calibrating the sensitivity of a smoke detector, comprising the following steps:

[0108] S1: Start the detection device and perform preliminary settings for the target detector;

[0109] S2: Obtain the calibration time and the detection value sequence of each standard detector, analyze the equipment based on the detection value sequence and issue operation commands;

[0110] S3: Obtain the calibration coefficients of each detector under test based on the operation instructions, and perform consistency processing on each detector under test based on the calibration coefficients.

[0111] Some of the data in the above formula are calculated by removing dimensions and taking their numerical values. The formula is the closest to the real situation obtained by software simulation of a large amount of collected data. The preset parameters and preset thresholds in the formula are set by those skilled in the art according to the actual situation or obtained through simulation of a large amount of data.

[0112] Working principle of the invention:

[0113] Open the exhaust valve to expel all smoke from the smoke chamber, and push the load vehicle equipped with the detector under test into the smoke chamber; the controller sets the detection sensitivity of the standard detector and the detector under test to α times the normal detection sensitivity via broadcast command; the controller initializes the background value settings of the standard detector and the detector under test via broadcast command; close the exhaust valve, start the fan, and add smoke into the smoke chamber; acquire the calibration time and the detection value sequence of each standard detector, analyze the equipment based on the detection value sequence, and issue operation commands; acquire the calibration coefficient of each detector under test based on the operation commands, and perform consistency processing on each detector under test based on the calibration coefficient.

[0114] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A system for accurately calibrating the sensitivity of a smoke detector, comprising: The utility model relates to a kind of intelligent analysis module and the preliminary setting module, data correction module and database connected therewith comprising: The preliminary setting module: for starting detection device and carrying out preliminary setting to target detector;Wherein, target detector includes standard detector and to-be-measured detector, preliminary setting includes detection sensitivity setting and initialization background value setting; The intelligent analysis module: for obtaining calibration time and the detection value sequence of each standard detector, based on detection value sequence analysis equipment and issue operation instruction;Wherein, operation instruction includes operation instruction one, operation instruction two and operation instruction three; The data correction module: for obtaining the calibration coefficient of each to-be-measured detector based on operation instruction, based on calibration coefficient to each to-be-measured detector carries out consistency processing; The starting detection device and carrying out preliminary setting to target detector, including: Open smoke valve, exhaust smoke in smoke box, push load car with to-be-measured detector into smoke box; Controller sets the detection sensitivity of standard detector and to-be-measured detector to normal detection sensitivity α times by broadcast command;Wherein, α is the proportional adjustment coefficient greater than 1; Controller sets standard detector and to-be-measured detector by broadcast command initialization background value; Close smoke valve, start fan, and add smoke to smoke box; The based on calibration coefficient to each to-be-measured detector carries out consistency processing, including: The initialization background value setting of standard detector and to-be-measured detector, including: The standard deviation of the calibration coefficient ZS of each detector to be tested is obtained, and it is judged whether the standard deviation exceeds the standard deviation range; if yes, an inspection reminder for the material or assembly process is issued; otherwise, the calibration coefficient ZS of each detector to be tested is obtained T h The standard detector and the detector to be tested are set to normal detection sensitivity, and the standard detector and the detector to be tested are initialized and set to the background value through broadcast command, when the detector to be tested works normally, the background value of the detector to be tested is obtained based on the formula BV T h = (V T h -B T h ) / ZS T h The correction increment BV T h is obtained, and the standard detection value of each detector to be tested is obtained, and the sensitivity of the detector to be tested is calibrated to be consistent according to the standard detection value; wherein V T h is the real-time detection value of each detector to be tested, and B T h is the background value of the detector to be tested.

2. The system for accurately calibrating the sensitivity of a smoke detector according to claim 1, wherein A1: the detection value of the same standard detector in smokeless state is integrated into W1 group, the detection value of the same to-be-measured detector in smokeless state is integrated into W2 group, and the characteristic value extraction of W1 group and W2 group is carried out;In turn, judge whether the characteristic value of W1 group or W2 group exceeds the corresponding standard range;Yes, remove the detection value that is most different from the mode of the group in the group, and re-extract the characteristic value of the group until the characteristic value of the group does not exceed the corresponding standard range, and jump to A2;No, jump to A2; The characteristic value extraction of W1 group and W2 group, including: A2: the characteristic value of each W1 group is taken as the background value B of the corresponding standard detector S i , the characteristic value of each W2 group is taken as the background value B of the corresponding detector to be measured T h ; wherein i is the serial number of the standard detector, and h is the serial number of the detector to be measured.

3. The system for accurately calibrating the sensitivity of a smoke detector according to claim 2, wherein Extract the average value PJ1, mode Z1 and percentage BS1 in W1 group, and obtain the characteristic value TZ1 of W1 group based on the formula TZ1=(β1×Z1+β2×BS1+PJ1) / 2;Wherein, β1 and β2 are proportional adjustment coefficients greater than 0, and β1+β2=1, β1≥β2; Extract the average value PJ2, mode Z2 and percentage BS2 in W2 group, and obtain the characteristic value TZ2 of W2 group based on the formula TZ2=(δ1×Z2+δ2×BS2+PJ2) / 2;Wherein, δ1 and δ2 are proportional adjustment coefficients greater than 0, and δ1+δ2=1, δ1≥δ2. The calibration time and the detection value sequence of each standard detector, including:

4. The system for accurately calibrating the sensitivity of a smoke detector according to claim 1, wherein, The based on detection value sequence analysis equipment and issue operation instruction, including: B1: the host computer acquires real-time detection values V of standard detectors in real time S ij , and removes abnormal values, and retains the real-time detection values V S ij , and removes abnormal values, and retains the real-time detection values V S ij The number of corresponding standard detectors is marked as N, and the latest real-time detection values V S ij marked as V S i , and obtains a detection value increment CL based on the formula CL = ∑(V S i -B S i ) / N, and judges whether the detection value increment CL is less than a calibration threshold; if yes, the real-time detection values V S ij of the standard detectors are continuously acquired, and the detection value increment CL is continuously obtained, until the detection value increment CL is not less than the calibration threshold, and then jumping to B2; if no, jumping to B2; wherein j is a detection order, and the value range of the summation symbol ∑ is [1, N]. B2: the real-time detection value V corresponding to the detection value increment CL not less than the calibration threshold value S ij The time marker is the calibration time, and the real-time detection value V obtained at the calibration time is marked as C S ij Marked as C S i Mark the detection value sequence of each standard detector as S i , S i = [V S i1 , V S i2 , …, C S i ].

5. The system for accurately calibrating the sensitivity of a smoke detector according to claim 4, wherein The pair of real-time detection values V S ij The outlier removal includes: extracting a plurality of real-time detection values V S ij judging whether the variance exceeds a variance determination threshold; if yes, extracting a plurality of real-time detection values V S ij obtaining a mode of the plurality of real-time detection values V S ij removing the real-time detection value V S ij which is most different from the mode, and re-performing variance determination until the variance does not exceed the variance determination threshold, and retaining the remaining real-time detection values V S ij ; if no, retaining the extracted plurality of real-time detection values V S ij .

6. The system for accurately calibrating the sensitivity of a smoke detector according to claim 1, wherein C2: judge whether the linearity and slope of each standard detector exist beyond corresponding determination range condition;Yes, issue operation instruction two;No, issue operation instruction three. C1: Sequentially extract the detection value sequence S of each standard detector. i The detection value sequence S i The values ​​are plotted on the ordinate, and the detection order j is plotted on the abscissa. Smoke rise curves for each standard detector are constructed using interpolation. The linearity and slope of the smoke rise curves are obtained. The detection value sequence S of each standard detector is then plotted. i The corresponding slopes are integrated into a slope group, the standard deviation of the slope group is obtained, and it is determined whether the standard deviation exceeds a preset range; if yes, operation command one is issued; if no, jump to C2. The based on operation instruction obtains the calibration coefficient of each to-be-measured detector, including:

7. A system for accurately calibrating the sensitivity of a smoke detector according to claim 6, wherein ​ D1: extract operation instruction, judge whether the extracted operation instruction is operation instruction one; yes, issue a pre-warning information of serious aging of partial standard detector, and stop subsequent operation; no, jump to D2; D2: judge whether the extracted operation instruction is operation instruction two; yes, issue a pre-warning information of abnormality of this time of smoke adding process, and return to start detection device operation and re-perform calibration operation; no, jump to D3; D3: Extract the retained real-time detection value V S ij The background value B of the corresponding standard detector S i And the detection value C of the corresponding standard detector at the calibration moment S i The background value B of the detector to be measured T h The detection value C of the detector to be measured at the calibration moment T h Based on the formula ZS T h =(C T h -B T h ) / (∑(C S i -B S i ) / N) to obtain the calibration coefficient ZS T h of each detector to be measured; wherein the value range of the summation symbol ∑ is [1, N]. 8.A method for accurately calibrating sensitivity of a smoke fire detector, based on the system for accurately calibrating sensitivity of a smoke fire detector according to any one of claims 1-7, characterized in that: S1: start the detection device and preliminarily set the target detector; S2: obtain the calibration time and the detection value sequence of each standard detector, analyze the equipment based on the detection value sequence and issue an operation instruction; S3: obtain the calibration coefficient of each detector to be tested based on the operation instruction, and perform consistency processing on each detector to be tested based on the calibration coefficient; The start detection device and preliminarily set the target detector, comprising: Open the smoke exhaust valve to exhaust the smoke in the smoke box, and push the load vehicle with the detector to be tested into the smoke box; The controller sets the detection sensitivity of the standard detector and the detector to be tested to be α times of the normal detection sensitivity through broadcast command; wherein, α is a proportional adjustment coefficient greater than 1; The controller initializes the background value setting of the standard detector and the detector to be tested through broadcast command; Close the smoke exhaust valve, start the fan, and add smoke to the smoke box; The consistency processing on each detector to be tested based on the calibration coefficient, comprising: The standard deviation of the calibration coefficient ZS of each detector to be tested is obtained, and it is judged whether the standard deviation exceeds the standard deviation range; if yes, an inspection reminder for the material or assembly process is issued; if no, the calibration coefficient ZS of each detector to be tested is obtained T h The standard detector and the detector to be tested are set to normal detection sensitivity, and the standard detector and the detector to be tested are initialized and set to the background value through a broadcast command, when the detector to be tested is working normally, the background value of the detector to be tested is obtained based on the formula BV T h = (V T h -B T h ) / ZS T h The modified increment BV T h is obtained, and the standard detection value of each detector to be tested is obtained, and the sensitivity of the detector to be tested is calibrated to be consistent according to the standard detection value; wherein V T h is the real-time detection value of each detector to be tested, and B T h is the background value of the detector to be tested.

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