System and method for accurately calibrating sensitivity of smoke fire detector

Abstract

The invention discloses a system and a method for accurately calibrating the sensitivity of a smoke fire detector, relates to the technical field of detector sensitivity calibration, and solves the problem that the sensitivity of the detector needs to be calibrated by using smog with relatively high concentration in the consistency setting of the sensitivity of the smoke fire detector. And the standard detector is easy to pollute. The method comprises the following steps: starting a detection device, preliminarily setting a target detector, obtaining a calibration moment and a detection value sequence of each standard detector, analyzing equipment based on the detection value sequence, and sending an operation instruction; obtaining a calibration coefficient of each to-be-detected detector based on the operation instruction, and performing consistency processing on each to-be-detected detector based on the calibration coefficient; high-concentration smoke is not used in sensitivity calibration, the pollution speed of a standard detector is reduced, and meanwhile pollution of calibration operation to the atmospheric environment is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of fire safety and relates to a detector sensitivity calibration technology, in particular to a system and method for accurately calibrating the sensitivity of a smoke fire detector. Background Art

[0002] With the acceleration of urbanization and the continuous increase in building height, fire safety has become a focus of social attention. Photoelectric smoke detectors, as a type of smoke fire detector, are an important part of the fire warning system, and their accuracy is directly related to the safety of people's lives and property. The basic structure and principle of photoelectric smoke detectors is that a group of optical signal transmitting tubes and optical signal receiving tubes are installed in an optical maze. When the fire smoke particles in the air enter the detector maze, the detection light in the maze will be scattered and irradiated on the photoelectric tube, thereby generating an electrical signal with an amplitude positively correlated with the smoke concentration. However, due to the inevitable differences in the electrical parameters of the transmitting tube and the receiving tube and the installation position, the sensitivity of the detector will be different, which seriously affects the consistency and reliability of the product.

[0003] At present, the uniform setting of the sensitivity of smoke fire detectors is to install the detector to be tested and the standard detector in a smoke box, then add smoke in the smoke box, and calibrate and correct the sensitivity of the detector to be tested by comparing the response of the detector to the smoke with that of the standard detector. In this method, in order to improve the anti-interference ability of the detector to water vapor, dust and other substances, the detection sensitivity of the smoke detector is set low. Therefore, a higher concentration of smoke is required when calibrating the sensitivity of the detector, which makes the standard detector easy to be contaminated and it is difficult to ensure the uniformity of the smoke during the calibration process.

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

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art; to this end, the present invention proposes a system and method for accurately calibrating the sensitivity of smoke fire detectors, which is used to solve the technical problem that in setting the consistency of the sensitivity of smoke fire detectors, it is necessary to use a higher concentration of smoke to calibrate the sensitivity of the detector, which makes the standard detector easily contaminated. The present invention solves the above-mentioned problem by starting the detection device and making preliminary settings for the target detector, obtaining the calibration time and the detection value sequence of each standard detector, analyzing the equipment based on the detection value sequence and issuing operation instructions; obtaining the calibration coefficient of each detector to be tested based on the operation instruction, and performing consistency processing on each detector to be tested based on the calibration coefficient.

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

[0007] The preliminary setting 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 to be tested, and the preliminary settings include detection sensitivity settings and initial background value settings;

[0008] The intelligent analysis module is used to obtain the calibration time and the detection value sequence of each standard detector, analyze the device based on the detection value sequence and issue an operation instruction; wherein the operation instruction includes operation instruction one, operation instruction two and operation instruction three;

[0009] The data correction module is used to 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.

[0010] Preferably, starting the detection device and performing preliminary settings on the target detector includes:

[0011] 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;

[0012] The controller sets the detection sensitivity of the standard detector and the detector to be tested to α times the normal detection sensitivity through a broadcast command; wherein α is a proportional adjustment coefficient greater than 1 set manually;

[0013] The controller initializes the background value settings of the standard detector and the detector to be tested through broadcast commands;

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

[0015] It should be noted that adding smoke means putting a certain amount of lit sanitary incense or cotton ropes into the smoke adding slot 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 initializing background value setting of the standard detector and the detector to be tested includes:

[0018] A1: Integrate the detection values ​​of the same standard detector in the smoke-free state into group W1, integrate the detection values ​​of the same detector to be tested in the smoke-free state into group W2, and extract the characteristic values ​​of group W1 and group W2; determine whether the characteristic value of group W1 or group W2 exceeds the corresponding standard range in turn; if yes, remove the detection value with the largest difference from the mode of 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, then jump to A2; if no, jump to A2;

[0019] A2: Take the characteristic value of each W1 group 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 tested T h ; Wherein, i is the serial number of the standard detector, h is the serial number of the detector to be tested, and the standard range is obtained by manual setting.

[0020] It should be noted that S and T are used to distinguish between a standard detector and a detector to be tested, S is a standard detector, and T is a detector to be tested.

[0021] Preferably, extracting feature values ​​from the W1 group and the W2 group includes:

[0022] The mean value PJ1, mode Z1 and percentage BS1 in the W1 group are extracted, and the characteristic value TZ1 of the W1 group is obtained based on the formula TZ1 = (β1×Z1+β2×BS1+PJ1) / 2; wherein β1 and β2 are both proportional adjustment coefficients greater than 0, and β1+β2=1, β1≥β2;

[0023] The mean value PJ2, mode Z2 and percentage BS2 in group W2 are extracted, and the characteristic value TZ2 of group W2 is obtained based on the formula TZ2 = (δ1×Z2+δ2×BS2+PJ2) / 2; wherein δ1 and δ2 are both proportional adjustment coefficients greater than 0, and δ1+δ2=1, δ1≥δ2; the percentile of the percentage is obtained by manual setting.

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

[0025] B1: The host computer obtains the real-time detection value V of the standard detector in real time S ij , for the real-time detection value V S ij Remove outliers and retain the real-time detection value V S ij The number of corresponding standard detectors is marked as N, and the latest real-time detection value V is retained S ij Marked as VS i , based on the formula CL = ∑(V S i -B S i ) / N to obtain the detection value increment CL, and determine whether the detection value increment CL is less than the calibration threshold; if yes, continue to obtain the real-time detection value V of the standard detector S ij , and obtain the detection value increment CL, until the detection value increment CL is not less than the calibration threshold, jump to B2; otherwise, jump to B2; where j is the detection order, the calibration threshold is obtained by manual setting; the value range of the summation symbol ∑ is [1, N];

[0026] B2: Set the real-time detection value V corresponding to the detection value increment CL not less than the calibration threshold S ij The acquired time is marked as the calibration time, and the real-time detection value V acquired at the calibration time is 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 ].

[0027] Preferably, the real-time detection value V S ij Perform outlier removal, including:

[0028] Extract some real-time detection values ​​V S ij The variance of the test result is determined to determine whether the variance exceeds the variance determination threshold; if yes, obtain several real-time detection values ​​V S ij mode, removing some real-time detection values ​​V S ij The real-time detection value V that differs the most from the mode S ij , and re-judge the variance until the variance does not exceed the variance judgment threshold, and retain the remaining real-time detection value V S ij ; No, retain the extracted real-time detection values ​​V S ij ; Among them, the variance judgment threshold is obtained through experience.

[0029] Preferably, analyzing the device based on the detection value sequence and issuing an operation instruction includes:

[0030] C1: Extract the detection value sequence S of each standard detector in turn i , the detection value sequence S i The values ​​in the figure are the ordinates, and the detection order j is the abscissa. The smoke rising curve of each standard detector is constructed by interpolation method; the linearity and slope corresponding to the smoke rising curve are obtained; the detection value sequence S of each standard detector is converted into 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, an operation instruction 1 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 instruction 2; if no, issue operation instruction 3; wherein the preset range and judgment range are both obtained through experience.

[0032] Preferably, the obtaining of the calibration coefficient of each detector to be tested based on the operation instruction includes:

[0033] D1: Extract the operation instruction and determine whether the extracted operation instruction is operation instruction 1; if yes, issue a warning message that some standard detectors are seriously aged and stop subsequent operations; if no, jump to D2;

[0034] D2: Determine whether the extracted operation instruction is the second operation instruction; if yes, issue a warning message indicating that the current smoke adding process is abnormal, and return to start the detection device operation and re-calibrate the operation; if no, jump to D3;

[0035] D3: Extract the retained real-time detection value V S ij The corresponding background value B of the standard detector S i And the corresponding standard detector detection value C at the calibration time S i , the background value B of the detector to be tested T h , the detection value C of the detector under test at the calibration time 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 of each detector to be testedT h ; Among them, the value range of the summation symbol ∑ is [1,N].

[0036] Preferably, the consistency processing of each detector to be tested based on the calibration coefficient includes:

[0037] Obtain the standard deviation of the calibration coefficient ZS of each detector to be tested, and determine whether the standard deviation exceeds the standard deviation range; if yes, issue a reminder to check the material or assembly process; if no, set the calibration coefficient ZS of each detector to be tested to T h The command is sent to the corresponding detectors to be tested, and the standard detector and the detector to be tested are set to normal detection sensitivity. The standard detector and the detector to be tested are initialized to set the background value through broadcast commands. When the detector to be tested is working normally, based on the formula BV T h =(V T h -B T h ) / ZS T h Get the corrected increment BV T h , determine the correction increment BV during detector detection T h Is it greater than the increment threshold? If yes, it indicates that there is a fire alarm; if no, it indicates that there is no fire alarm; where V T h is the real-time detection value of each detector to be tested, and the incremental threshold is obtained through empirical setting.

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

[0039] S1: Start the detection device and perform preliminary settings on 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 an operation instruction;

[0041] S3: obtaining calibration coefficients of each detector to be tested based on the operation instruction, and performing consistency processing on each detector to be tested based on the calibration coefficients.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The present invention starts the detection device and performs preliminary settings on 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 issues an operation instruction; obtains the calibration coefficient of each detector to be tested based on the operation instruction, and performs consistency processing on each detector to be tested based on the calibration coefficient, thereby solving the technical problem that in the consistency setting of the sensitivity of the smoke fire detector, a higher concentration of smoke is needed to calibrate the sensitivity of the detector, which makes the standard detector easy to be contaminated. The present invention does not need to use high-concentration smoke in the sensitivity calibration, reduces the contamination rate of the standard detector, reduces the maintenance frequency of the standard detector and other components, and also reduces the pollution of the calibration operation to the atmospheric environment.

[0044] 2. The present invention ensures the standardization of the calibration process by detecting the linearity and slope of the smoke rising curve of each standard detector, and detects the state of the standard detector in real time by detecting the standard deviation of the slope group, which can ensure the stability of the data and the reliability of the calibration results.

[0045] 3. The calibration coefficient obtained by the present invention is obtained by analyzing the detection values ​​of each detector to be tested at the calibration time. The calibration coefficient can be obtained in a personalized manner according to the differences of each detector product to be tested, and then the standard detection value of each detector to be tested is obtained according to the calibration coefficient. The detector sensitivity can be dynamically adjusted according to the standard detection value. Through the present invention, when calibrating the sensitivity of the detector to be tested, low-concentration smoke can be used to calibrate the sensitivity of the detector, so that smoke can be added slowly during the calibration process, which provides favorable conditions for evenly diffusing the smoke and improves the accuracy of the calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0048] Figure 2 It is a schematic diagram of the system module of the present invention;

[0049] Figure 3 A schematic diagram of the operation steps for obtaining the calibration coefficient of the present invention;

[0050] Figure 4 It is a diagram of the detection device of the present invention. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] See also Figure 1-Figure 2 , the first aspect of the present invention provides a system for accurately calibrating the sensitivity of smoke fire detectors, including: an intelligent analysis module, and a preliminary setting module, a data correction module and a database connected thereto;

[0053] Preliminary setting module: 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 to be tested, and the preliminary settings include detection sensitivity settings and initial background value settings;

[0054] Intelligent analysis module: used to 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 instructions; wherein the operation instructions include operation instruction 1, operation instruction 2 and operation instruction 3;

[0055] Data correction module: used to 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.

[0056] See also 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 instructions are as follows: a smoke feeding groove is set at the bottom of the smoke box for placing lit incense, cotton ropes, etc.; a number of fans are set inside the smoke box to stir the smoke in the smoke box evenly; the smoke box is provided with a smoke exhaust valve, during the calibration process, the smoke exhaust valve is closed to ensure the airtightness of the smoke box, and after the calibration is completed, the smoke exhaust valve is opened to exhaust the smoke and prepare for the next calibration; the load vehicle is used to install the detector to be tested, which can be pushed into the smoke box for batch calibration of the detector; the controller communicates with the standard detector and the detector to be tested through the bus of the automatic fire alarm system, and communicates with the host computer through the serial port.

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

[0059] In this application, the detection device is started and the target detector is preliminarily set up, including:

[0060] 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;

[0061] The controller sets the detection sensitivity of the standard detector and the detector to be tested to α times the normal detection sensitivity through a broadcast command; wherein α is a proportional adjustment coefficient greater than 1 set manually;

[0062] The controller initializes the background value settings of the standard detector and the detector to be tested through broadcast commands;

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

[0064] It should be noted that the broadcast command is used to implement "one-to-many" communication, and all standard detectors and detectors to be tested on the bus will perform 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 circuit processing the receiving tube signal.

[0066] It should be noted that the controller communicates with the standard detector and the detector to be tested through the bus of the automatic fire alarm system, and communicates with the host computer through the serial port.

[0067] It should be noted that adding smoke means putting a certain amount of lit sanitary incense or cotton ropes into the smoke adding slot 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] In this application, the background value of the standard detector and the detector to be tested is initialized and set, including:

[0070] A1: Integrate the detection values ​​of the same standard detector in the smoke-free state into group W1, integrate the detection values ​​of the same detector to be tested in the smoke-free state into group W2, and extract the characteristic values ​​of group W1 and group W2; determine whether the characteristic value of group W1 or group W2 exceeds the corresponding standard range in turn; if yes, remove the detection value with the largest difference from the mode of 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, then jump to A2; if no, jump to A2;

[0071] A2: Take the characteristic value of each W1 group 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 tested T h ; Wherein, i is the serial number of the standard detector, h is the serial number of the detector to be tested, and the standard range is obtained by manual setting.

[0072] It should be noted that S and T are used to distinguish between a standard detector and a detector to be tested, S is a standard detector, and T is a detector to be tested.

[0073] In this application, feature value extraction is performed on group W1 and group W2, including:

[0074] The mean value PJ1, mode Z1 and percentage BS1 in the W1 group are extracted, and the characteristic value TZ1 of the W1 group is obtained based on the formula TZ1 = (β1×Z1+β2×BS1+PJ1) / 2; wherein β1 and β2 are both proportional adjustment coefficients greater than 0, and β1+β2=1, β1≥β2;

[0075] The mean value PJ2, mode Z2 and percentage BS2 in group W2 are extracted, and the characteristic value TZ2 of group W2 is obtained based on the formula TZ2 = (δ1×Z2+δ2×BS2+PJ2) / 2; wherein δ1 and δ2 are both proportional adjustment coefficients greater than 0, and δ1+δ2=1, δ1≥δ2; the percentile of the percentage is obtained by manual setting.

[0076] It is worth noting that the present invention uses percentiles when calculating eigenvalues. The reason for adding this value is that: the system can set different percentiles according to the needs of the device, so that the acquired eigenvalues ​​can adapt to different devices, increasing the flexibility of the system; at the same time, there may be abnormal values ​​or outliers in the data group, which may have a greater impact on statistics such as the mean. Using percentiles can reduce the interference of these abnormal values ​​and improve the accuracy of system analysis.

[0077] It should be noted that in the present invention, percentile BS1 or percentile BS2 is a value at a specific percentile in each group; for example, if the data of each group are sorted from small to large, if the manually set percentile is 60%, then the data at the 60% position of each group in sequence is the percentile of the group. If there is no data at the 60% position of the group, the data closest to the 60% position is used as the percentile of the group.

[0078] In this application, the calibration time and the detection value sequence of each standard detector are obtained, including:

[0079] B1: The host computer obtains the real-time detection value V of the standard detector in real time S ij , for the real-time detection value V S ij Remove outliers and retain the real-time detection value V S ij The number of corresponding standard detectors is marked as N, and the latest real-time detection value V is retained S ij Marked as VS i , based on the formula CL = ∑(V S i -B S i ) / N to obtain the detection value increment CL, and determine whether the detection value increment CL is less than the calibration threshold; if yes, continue to obtain the real-time detection value V of the standard detector S ij , and obtain the detection value increment CL, until the detection value increment CL is not less than the calibration threshold, jump to B2; otherwise, jump to B2; where j is the detection order, the calibration threshold is obtained by manual setting; the value range of the summation symbol ∑ is [1, N];

[0080] B2: Set the real-time detection value V corresponding to the detection value increment CL not less than the calibration threshold S ij The acquired time is marked as the calibration time, and the real-time detection value V acquired at the calibration time is 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 ].

[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 S ij Perform outlier removal, including:

[0083] Extract some real-time detection values ​​V S ij The variance is determined to determine whether the variance exceeds the variance determination threshold; if yes, obtain several real-time detection values ​​V S ij mode, removing some real-time detection values ​​V S ij The real-time detection value V that differs the most from the mode S ij , and re-judge the variance until the variance does not exceed the variance judgment threshold, and retain the remaining real-time detection value V S ij ; No, retain the extracted real-time detection values ​​V S ij; Among them, the variance judgment threshold is obtained through experience.

[0084] It is worth noting that the present invention is in the real-time detection value V S ij In the process of removing outliers, the variance judgment method is used to judge whether there are fluctuation values ​​with large errors in the current data. If there are fluctuation values ​​with large errors, the values ​​are removed and the remaining data are retained. This operation can ensure the stability of the retained data and can significantly reduce the impact of abnormal data on the overall data set, thereby improving the accuracy and reliability of the data.

[0085] In this application, the device is analyzed based on the detection value sequence and operation instructions are issued, including:

[0086] C1: Extract the detection value sequence S of each standard detector in turn i , the detection value sequence S i The values ​​in the figure are the ordinates, and the detection order j is the abscissa. The smoke rising curves of each standard detector are constructed by interpolation method. The linearity and slope corresponding to the smoke rising curve are obtained. The detection value sequence S of each standard detector is converted into 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 1 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 instruction 2; if no, issue operation instruction 3; wherein the preset range and judgment range are both obtained through experience.

[0088] It is worth noting that the present invention ensures the standardization of the calibration process by detecting the linearity and slope of the smoke rising curve of each standard detector, and detects the state of the standard detector in real time by detecting the standard deviation of the slope group, which can ensure the stability of the data and ensure the reliability of the calibration results.

[0089] See also Figure 3 In this application, the calibration coefficients of each detector to be tested are obtained based on the operation instructions, including:

[0090] D1: Extract the operation instruction and determine whether the extracted operation instruction is operation instruction 1; if yes, issue a warning message that some standard detectors are seriously aged and stop subsequent operations; if no, jump to D2;

[0091] D2: Determine whether the extracted operation instruction is the second operation instruction; if yes, issue a warning message indicating that the current smoke adding process is abnormal, and return to start the detection device operation and re-calibrate the operation; if no, jump to D3;

[0092] D3: Extract the retained real-time detection value VS ij The corresponding background value B of the standard detector S i And the corresponding standard detector detection value C at the calibration time S i , the background value B of the detector to be tested T h , the detection value C of the detector under test at the calibration time 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 of each detector to be tested T h ; Among them, the value range of the summation symbol ∑ is [1,N].

[0093] It is worth noting that the calibration coefficient obtained by the present invention is obtained by analyzing the detection values ​​of each detector to be tested at the calibration time. The calibration coefficient can be obtained in a personalized manner according to the differences of each detector product to be tested, and then the standard detection value of each detector to be tested is obtained according to the calibration coefficient. Through the present invention, when calibrating the sensitivity of the detector to be tested, low-concentration smoke can be used to calibrate the sensitivity of the detector, so that smoke can be added slowly during the calibration process, which provides favorable conditions for uniform diffusion of smoke and improves the accuracy of calibration.

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

[0095] It should be noted that in step D2, when the extracted operation instruction is operation instruction two, a warning message indicating that the current smoke adding process is abnormal is issued, and the process returns to start the detection device operation and re-calibrate the operation; the return to start the detection device operation and re-calibrate the operation here 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, it jumps to D2, so 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, it jumps to D3, which means that step D3 is a specific processing step for operation instruction three, and when operation instruction three is received, the calibration coefficient of each detector to be tested is obtained.

[0097] In this embodiment, if the background value B of the detector to be tested with sequence number 1 is T 1=12, the detection value C at the calibration time T 1=82;

[0098] The background value B of the detector to be tested with serial number 2 T 2 = 18, the detection 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 detection 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 detection 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 detection value C at the calibration time S 3=85;

[0102] Therefore, the calibration coefficient ZS of the detector to be tested 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] The calibration coefficient ZS of the detector to be tested with 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] In this application, the consistency processing of each detector to be tested is performed based on the calibration coefficient, including:

[0105] Obtain the standard deviation of the calibration coefficient ZS of each detector to be tested, and determine whether the standard deviation exceeds the standard deviation range; if yes, issue a reminder to check the material or assembly process; if no, set the calibration coefficient ZS of each detector to be tested to T h The command is sent to the corresponding detectors to be tested, and the standard detector and the detector to be tested are set to normal detection sensitivity. The standard detector and the detector to be tested are initialized to set the background value through broadcast commands. When the detector to be tested is working normally, based on the formula BV T h =(V T h -B T h ) / ZS T h Get the corrected increment BV T h , determine the correction increment BV during detector detection T h Is it greater than the increment threshold? If yes, it indicates that there is a fire alarm; if no, it indicates that there is no fire alarm; where V T h is the real-time detection value of each detector to be tested, and the incremental threshold is obtained through empirical setting.

[0106] It should be noted that the consistency processing can be understood as: using the obtained calibration coefficient ZS to correct the detection value increment of the detector, so that each detector can alarm with the same sensitivity; if no correction is made, then the detector may alarm for the same concentration of smoke while others may not, that is to say, the sensitivity of the detector may be high or low. The goal of calibration is to adjust the sensitivity of the detector 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 fire detector, comprising the following steps:

[0108] S1: Start the detection device and perform preliminary settings on 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 an operation instruction;

[0110] S3: obtaining calibration coefficients of each detector to be tested based on the operation instruction, and performing consistency processing on each detector to be tested based on the calibration coefficients.

[0111] Part of the data in the above formula is calculated by removing the dimension and taking its numerical value. The formula is a formula closest to the actual situation obtained by software simulation of a large amount of collected data; the preset parameters and preset thresholds in the formula are set by technical personnel in this field according to actual conditions or obtained through simulation of a large amount of data.

[0112] Working principle of the present invention:

[0113] Open the smoke exhaust valve to exhaust the smoke in the smoke box, and push the load vehicle equipped 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 α times the normal detection sensitivity through broadcast commands; the controller initializes the background value setting of the standard detector and the detector to be tested through broadcast commands; close the smoke exhaust valve, start the fan, and add smoke into the smoke box; 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 instructions; obtain the calibration coefficient of each detector to be tested based on the operation instructions, and perform consistency processing on each detector to be tested based on the calibration coefficient.

[0114] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A system for accurately calibrating the sensitivity of smoke fire detectors, characterized in that: include: Intelligent analysis module, and the preliminary setting module, data correction module and database connected thereto; The preliminary setting 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 to be tested, and the preliminary settings include detection sensitivity settings and initial background value settings; The intelligent analysis module is used to obtain the calibration time and the detection value sequence of each standard detector, analyze the device based on the detection value sequence and issue an operation instruction; wherein the operation instruction includes operation instruction one, operation instruction two and operation instruction three; The data correction module is used to 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.

2. A system for accurately calibrating the sensitivity of smoke fire detectors according to claim 1, characterized in that: The starting detection device and performing preliminary settings on the target detector include: 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 α times the normal detection sensitivity through a broadcast command; wherein α is a proportional adjustment coefficient greater than 1; The controller initializes the background value settings of the standard detector and the detector to be tested through broadcast commands; Close the smoke exhaust valve, start the fan, and add smoke into the smoke box.

3. A system for accurately calibrating the sensitivity of smoke fire detectors according to claim 2, characterized in that: The initialization background value setting of the standard detector and the detector to be tested includes: A1: Integrate the detection values ​​of the same standard detector in the smoke-free state into group W1, integrate the detection values ​​of the same detector to be tested in the smoke-free state into group W2, and extract the characteristic values ​​of group W1 and group W2; determine whether the characteristic value of group W1 or group W2 exceeds the corresponding standard range in turn; if yes, remove the detection value with the largest difference from the mode of 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, then jump to A2; if no, jump to A2; A2: Take the characteristic value of each W1 group 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 tested T h ; Where i is the serial number of the standard detector and h is the serial number of the detector to be tested.

4. A system for accurately calibrating the sensitivity of smoke fire detectors according to claim 3, characterized in that: The extracting of feature values ​​from the W1 group and the W2 group includes: The mean value PJ1, mode Z1 and percentage BS1 in the W1 group are extracted, and the characteristic value TZ1 of the W1 group is obtained based on the formula TZ1 = (β1×Z1+β2×BS1+PJ1) / 2; wherein β1 and β2 are both proportional adjustment coefficients greater than 0, and β1+β2=1, β1≥β2; The average value PJ2, mode Z2 and percentage BS2 in the W2 group are extracted, and the characteristic value TZ2 of the W2 group is obtained based on the formula TZ2 = (δ1×Z2+δ2×BS2+PJ2) / 2; wherein δ1 and δ2 are both proportional adjustment coefficients greater than 0, and δ1+δ2=1, δ1≥δ2.

5. The system for accurately calibrating the sensitivity of smoke fire detectors according to claim 1, characterized in that: The step of obtaining the calibration time and the detection value sequence of each standard detector includes: B1: The host computer obtains the real-time detection value V of the standard detector in real time S ij , for the real-time detection value V S ij Remove outliers and retain the real-time detection value V S ij The number of corresponding standard detectors is marked as N, and the latest real-time detection value V is retained S ij Marked as V S i , based on the formula CL = ∑(V S i -B S i ) / N to obtain the detection value increment CL, and determine whether the detection value increment CL is less than the calibration threshold; if yes, continue to obtain the real-time detection value V of the standard detector S ij , and obtain the detection value increment CL, until the detection value increment CL is not less than the calibration threshold, jump to B2; otherwise, jump to B2; where j is the detection order, and the value range of the summation symbol ∑ is [1, N]; B2: Set the real-time detection value V corresponding to the detection value increment CL not less than the calibration threshold S ij The acquired time is marked as the calibration time, and the real-time detection value V acquired at the calibration time is 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 ].

6. A system for accurately calibrating the sensitivity of smoke fire detectors according to claim 5, characterized in that: The real-time detection value V S ij Perform outlier removal, including: Extract some real-time detection values ​​V S ij The variance of the test result is determined to determine whether the variance exceeds the variance determination threshold; if yes, obtain several real-time detection values ​​V S ij mode, removing some real-time detection values ​​V S ij The real-time detection value V that differs the most from the mode S ij , and re-judge the variance until the variance does not exceed the variance judgment threshold, and retain the remaining real-time detection value V S ij ; No, retain the extracted real-time detection values ​​V S ij .

7. The system for accurately calibrating the sensitivity of smoke fire detectors according to claim 1, characterized in that: The analyzing the device based on the detection value sequence and issuing an operation instruction includes: C1: Extract the detection value sequence S of each standard detector in turn i , the detection value sequence S i The values ​​in the figure are the ordinates, and the detection order j is the abscissa. The smoke rising curve of each standard detector is constructed by interpolation method; the linearity and slope corresponding to the smoke rising curve are obtained; the detection value sequence S of each standard detector is converted into 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, an operation instruction 1 is issued; if no, jump to C2; C2: Determine whether the linearity and slope of each standard detector exceed the corresponding determination range; if yes, issue operation instruction 2; if no, issue operation instruction 3.

8. The system for accurately calibrating the sensitivity of smoke fire detectors according to claim 7, characterized in that: The step of obtaining the calibration coefficient of each detector to be tested based on the operation instruction includes: D1: Extract the operation instruction and determine whether the extracted operation instruction is operation instruction 1; if yes, issue a warning message that some standard detectors are seriously aged and stop subsequent operations; if no, jump to D2; D2: Determine whether the extracted operation instruction is the second operation instruction; if yes, issue a warning message indicating that the current smoke adding process is abnormal, and return to start the detection device operation and re-calibrate the operation; if no, jump to D3; D3: Extract the retained real-time detection value V S ij The corresponding background value B of the standard detector S i And the corresponding standard detector detection value C at the calibration time S i , the background value B of the detector to be tested T h , the detection value C of the detector under test at the calibration time 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 of each detector to be tested T h ; Among them, the value range of the summation symbol ∑ is [1,N].

9. A system for accurately calibrating the sensitivity of smoke fire detectors according to claim 8, characterized in that: The consistency processing of each detector to be tested based on the calibration coefficient includes: Obtain the standard deviation of the calibration coefficient ZS of each detector to be tested, and determine whether the standard deviation exceeds the standard deviation range; if yes, issue a reminder to check the material or assembly process; if no, set the calibration coefficient ZS of each detector to be tested to T h The command is sent to the corresponding detectors to be tested, and the standard detector and the detector to be tested are set to normal detection sensitivity. The standard detector and the detector to be tested are initialized to set the background value through broadcast commands. When the detector to be tested is working normally, based on the formula BV T h =(V T h -B T h ) / ZS T h Get the corrected increment BV T h , determine the correction increment BV during detector detection T h Is it greater than the increment threshold? If yes, it indicates that there is a fire alarm; if no, it indicates that there is no fire alarm; where V T h is the real-time detection value of each detector to be tested.

10. A method for accurately calibrating the sensitivity of a smoke fire detector, based on the operation of a system for accurately calibrating the sensitivity of a smoke fire detector according to any one of claims 1 to 9, characterized in that: S1: Start the detection device and perform preliminary settings on 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: obtaining calibration coefficients of each detector to be tested based on the operation instruction, and performing consistency processing on each detector to be tested based on the calibration coefficients.

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