A portable gas alarm detection method based on multi-sensor fusion

Abstract

This invention relates to the field of gas alarm detection technology and discloses a portable gas alarm detection method based on multi-sensor fusion. The method includes: determining whether the gas detection value collected by the device is accurate; determining whether the gas detection value is abnormal; analyzing the cause of the abnormality when the gas detection value is inaccurate; and performing corresponding corrections. This portable gas alarm detection method based on multi-sensor fusion ensures the accuracy of gas detection values ​​through multi-step verification and correction, reducing false alarms and missed alarms. Through battery health management and timely correction, it extends the service life of the gas detection equipment and reduces equipment replacement costs. In critical operations, it ensures the reliability and stability of the equipment, protecting the safety of personnel and equipment. Through intelligent prediction and health management models, it predicts battery life in advance, optimizes maintenance strategies, and reduces unexpected downtime.

Description

Technical Field

[0001] This invention relates to the field of gas alarm detection technology, specifically a portable gas alarm detection method based on multi-sensor fusion. Background Technology

[0002] Gas leak detectors are crucial equipment for ensuring production safety, personal safety, and environmental monitoring. In numerous scenarios, including industrial production, underground operations, urban gas pipelines, fire rescue, and home safety, leaks of toxic, harmful, flammable, or explosive gases can lead to serious safety accidents. Traditional portable gas detectors typically use a single type of sensor (such as catalytic combustion, electrochemical, semiconductor, or infrared) to detect one or a few specific gases. The core of the multi-sensor fusion-based portable gas alarm detection method is to utilize multiple intelligent gas sensors based on different physicochemical principles. Through series or parallel connection and close signal acquisition and data processing, it achieves collaborative perception of the target gas and its environmental information. Subsequently, advanced sensor fusion algorithms and machine learning models are used to intelligently analyze and judge the raw signals output by each sensor, thereby overcoming the limitations of a single sensor. This enables high-precision identification and differentiation of the target gas type, concentration, and environmental interference, ultimately issuing an accurate alarm. The aim is to address the shortcomings of existing portable gas detectors in terms of accuracy, selectivity, reliability, anti-interference capability, and multi-gas identification ability, constructing a next-generation portable gas detection device capable of collaboratively sensing and comprehensively analyzing multiple gases, and possessing real-time, accurate, and reliable alarm functions.

[0003] Existing portable gas alarm detection methods based on multi-sensor fusion cannot promptly determine whether the currently collected gas detection values ​​are accurate, cannot assess whether there is a problem with the device's battery, cannot determine whether inaccurate gas detection values ​​are caused by an unhealthy battery, and cannot perform timely corrections. This can easily lead to false alarms and missed alarms, resulting in dangerous situations. Therefore, their practicality is limited. Summary of the Invention

[0004] This invention provides a portable gas alarm detection method based on multi-sensor fusion, which helps to solve the problems mentioned in the background art.

[0005] This invention provides the following technical solution: a portable gas alarm detection method based on multi-sensor fusion, comprising:

[0006] The system determines whether the gas detection value is accurate; if the gas detection value is accurate, it determines whether the gas detection value is abnormal; if the gas detection value is abnormal, it issues an abnormality alarm; if the gas detection value is normal, it displays the detection value normally; if the gas detection value is inaccurate, it analyzes the cause of the abnormality; it corrects the value based on the cause until the gas detection value is determined to be accurate; after correction, it determines whether the gas detection value is abnormal; if the gas detection value is abnormal, it issues an abnormality alarm; if the gas detection value is normal, it displays the detection value normally.

[0007] As an optional solution to the portable gas alarm detection method based on multi-sensor fusion described in this invention, the method for determining whether the gas detection value is accurate specifically involves: acquiring the zero-point value of the target device and determining whether the zero-point deviation meets the standard; acquiring the range value of the target device and determining whether the range deviation meets the standard; acquiring the response time of the target device and determining whether the response time meets the standard; and determining whether the gas detection value is accurate. If so, the gas detection value is considered accurate; if If the gas detection value is inaccurate, then an environmental interference analysis will be performed.

[0008] As an optional solution to the portable gas alarm detection method based on multi-sensor fusion described in this invention, the following steps are taken: Environmental interference analysis is performed, specifically: the temperature and humidity of the target environment are collected to determine if the temperature and humidity of the target environment are abnormal; the interfering gas values ​​of the target environment are collected to determine if there are cross-interfering gases in the target environment; the target environment is determined to be in a depressurized state of a confined space; the usage time of the target device is collected to determine if the target device is within its effective lifespan; and environmental interference is determined in the gas detection. If environmental interference is detected, the gas detection is determined to be affected, and the system is marked as having environmental interference until the environment stabilizes. Then, the accuracy of the gas detection value is reassessed. If there is no environmental interference in the gas detection, then the gas detection value is determined to be inaccurate.

[0009] As an optional solution of the portable gas alarm detection method based on multi-sensor fusion described in this invention, the following steps are taken: Analyzing the cause of the anomaly specifically includes: analyzing battery health; if the battery health is deemed questionable, checking for reading drift to determine if the reading is within the deviation range; checking for slow response to determine if the T90 response time meets requirements; checking for negative pressure display to determine if the negative pressure display meets requirements; checking for random jumps to determine if random jumps meet requirements; checking for nonlinear errors to determine if the sensor error at high concentrations meets requirements; checking for abnormal shutdown to determine if the target device has an abnormal shutdown condition; checking for power-error correlation to determine if there is a correlation between the target device's error value and power level; checking for voltage stability to determine if the target device's dynamic voltage drop meets requirements; checking for full-charge battery life degradation to determine if the target device's full-charge battery life degradation meets requirements, used to assess the overall health and remaining lifespan of the battery; and determining if the gas alarm detection is caused by an unhealthy battery. If the gas alarm is detected, it is determined that the problem is caused by an unhealthy battery; therefore, adjustments are made based on the cause of the anomaly until the gas detection value is determined to be accurate; if If the gas alarm is not caused by an unhealthy battery, then the alarm should indicate that the device is malfunctioning and should be replaced promptly.

[0010] As an optional solution to the portable gas alarm detection method based on multi-sensor fusion described in this invention, the following steps are included: analyzing battery health, specifically: performing a zero-point self-test and recording the daily zero-point check results; controlling the target device to automatically simulate a handheld fan method to generate a step change in gas concentration; analyzing and determining the type of response speed; judging whether the sensor response speed is qualified; checking the gas path patency and judging whether the gas path is unobstructed; judging whether the battery health is questionable, and forming a first analytical conclusion; if... If the battery health is questionable, then the battery's health is deemed doubtful; if If the battery health is normal, proceed to the second analysis.

[0011] As an optional solution of the portable gas alarm detection method based on multi-sensor fusion described in this invention, the second analysis is performed, specifically: determining whether the target device's low alarm warning function is normal; determining whether the target device's high alarm warning function is normal; determining whether the target device's short-term exposure limit alarm function is normal; determining whether the deviation between the actual alarm concentration and the set value of the target device meets the requirements; determining whether the target device has intelligent anti-interference function; determining whether the target device's confirmation and reset functions are normal; determining whether the target device's display screen function is normal; determining whether the target device's data storage function is normal; determining whether the target device's communication function is normal; determining whether the target device's device function is suspicious, and forming a second analysis conclusion; if If so, the device function of the target device is deemed suspicious; if If the target device is found to be functioning normally, then the third analysis will be performed.

[0012] As an optional solution to the portable gas alarm detection method based on multi-sensor fusion described in this invention, the third analysis specifically includes: calculating the equivalent full-charge battery life of the target device to assess the battery's health status and determine the target device's battery health; determining whether the target device has battery aging through a charging efficiency decay tracking method; determining whether the target device has low-battery performance abnormalities when the target device is at low battery level; determining whether there are abnormal temperature events during the charging process of the target device; and recording the initial power consumption of the target device each time it is powered on. ; Statistically analyze deep discharge events of the target device; Calculate the comprehensive battery health score of the target device to comprehensively determine the type of battery health; Predict battery life based on cycle count; Determine whether the battery condition of the target device is suspicious, and form a third analysis conclusion; Determine whether the battery health of the target device is suspicious; If If the battery health is questionable, then the battery's health is deemed doubtful; if If the gas alarm is detected, the battery health is determined to be normal; if not, the gas alarm detection is determined to be not caused by an unhealthy battery; if so, the alarm indicates that the device is malfunctioning and the device should be replaced promptly.

[0013] As an optional solution to the portable gas alarm detection method based on multi-sensor fusion described in this invention, the following steps are performed: Correction is initiated based on the cause of the anomaly until the gas detection value is determined to be accurate. Specifically: when the battery health is <70%, the cycle count is >500, or irreversible capacity decay occurs, a battery replacement operation is performed; when the battery health is >70%, but deep discharge occurs due to long-term storage, a charging recovery operation is performed; after performing the battery replacement or charging recovery operation, a forced calibration process is executed; after calibration, a step is performed to determine whether the gas detection value is accurate; if the gas detection value is determined to be accurate, calibration is stopped; if the gas detection value is determined to be inaccurate, calibration continues until the gas detection value is determined to be accurate.

[0014] The present invention has the following beneficial effects:

[0015] 1. This portable gas alarm detection method based on multi-sensor fusion verifies the accuracy of the currently collected gas detection value by combining zero-point verification, range verification, and response time verification with environmental temperature and humidity, interfering gas values, and sensor lifespan. If the current collected gas detection value is accurate, it determines whether the gas detection value is abnormal. If abnormal, an abnormal alarm is triggered; otherwise, normal display is achieved. This method quickly identifies whether the detection equipment is in normal working condition, avoiding safety risks caused by equipment failure. Through standard gas verification and environmental interference elimination, it ensures the reliability of the detection results, promptly detects abnormal gas concentrations, and avoids safety accidents caused by gas leaks. Through threshold judgment, it quickly distinguishes between normal and abnormal situations, ensuring timely alarm.

[0016] 2. This portable gas alarm detection method based on multi-sensor fusion can detect inaccurate gas values ​​by analyzing the battery health. If the battery is unhealthy, the gas alarm detection may be caused by battery instability. The method then checks and verifies various functions of the device, including power-error correlation testing, voltage stability testing, and full-charge battery life degradation verification, to determine whether the inaccurate gas detection is caused by battery instability. Specifically, it checks the correlation between inaccurate gas detection and battery instability. If the battery level suddenly drops from 80% to 20% (phantom charge) more than three times in the past month, it directly indicates battery aging, meaning the inaccurate gas detection is caused by battery instability. Conversely, if no such drops occur, the inaccurate gas detection is not caused by battery instability. This method accurately identifies the root cause of inaccurate detection, avoiding blind repairs and component replacements. Through battery health analysis and battery problem diagnosis, it precisely locates the problem. By integrating the results of multiple analysis steps, it comprehensively assesses the device's status, providing a scientific basis for device maintenance. The combined conclusions of the first, second, and third analyses form a comprehensive device health assessment report to guide subsequent maintenance and management.

[0017] 3. This portable gas alarm detection method based on multi-sensor fusion analyzes the battery health of the device by collecting battery-related parameter records during device use, tracking the device's charging efficiency, judging the target device's battery life health, and using a charging efficiency decay tracking method to determine if the target device has battery aging. When the target device is at low power (SOC < 25%), it judges whether there are any low power performance abnormalities. It also judges whether there are any abnormal temperature events during the target device's charging process, counts the target device's deep discharge events, and calculates the target device's comprehensive battery health score to comprehensively judge whether the battery is healthy. If the battery is healthy, it means that the gas alarm detection is not caused by battery unhealthy, and an alarm is triggered to indicate device abnormality, allowing for timely device replacement. It accurately identifies the root cause of inaccurate detection, avoiding blind repairs and component replacements. Through battery health analysis and battery problem diagnosis, it accurately locates the problem. By integrating the results of multiple steps of analysis, it comprehensively assesses the device status, providing a scientific basis for device maintenance. Combining the conclusions of the first, second, and third analyses, it forms a comprehensive device health assessment report to guide subsequent maintenance and management.

[0018] 4. This portable gas alarm detection method based on multi-sensor fusion, when it is determined that inaccurate gas detection values ​​are caused by an unhealthy battery, will perform battery replacement or recharging operations according to the battery's abnormal condition. Forced calibration is performed through zero-point calibration, range calibration, and multi-point linearity verification. Functional verification is conducted through alarm function testing, voltage fluctuation simulation verification, and battery life verification. If inaccuracy persists after calibration, issues such as sensor excitation circuit damage, irreversible sensor poisoning, and loss of AD converter accuracy are addressed until the gas detection values ​​are determined to be accurate after calibration. The system's correction steps restore the device's detection accuracy, ensuring optimal operation. Replacing aging batteries restores power supply stability. Zero-point and range calibration ensure sensor measurement accuracy. Alarm function and voltage fluctuation verification ensure device stability under low battery conditions. Extreme situations such as sensor damage are addressed, ensuring long-term device reliability. Attached Figure Description

[0019] Figure 1 This is a flowchart of the portable gas alarm detection method based on multi-sensor fusion according to the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0021] Example 1: A portable gas alarm detection method based on multi-sensor fusion, see [reference] Figure 1 ,include:

[0022] The system determines whether the gas detection value is accurate; if the gas detection value is accurate, it determines whether the gas detection value is abnormal; if the gas detection value is abnormal, it issues an abnormality alarm; if the gas detection value is normal, it displays the detection value normally; if the gas detection value is inaccurate, it analyzes the cause of the abnormality; it corrects the value based on the cause until the gas detection value is determined to be accurate; after correction, it determines whether the gas detection value is abnormal; if the gas detection value is abnormal, it issues an abnormality alarm; if the gas detection value is normal, it displays the detection value normally.

[0023] Specifically, determining whether a gas detection value is abnormal involves: acquiring the gas detection value, denoted as... The gas detection value is the concentration value of the gas actually read by the gas detector at the current time;

[0024] Through the exception detection function To determine if the gas detection value is abnormal: ;in, The preset normal threshold is different for different types of gases and application scenarios. If the actual gas detection value exceeds the normal threshold corresponding to the gas type and application scenario, the gas detection value is abnormal; otherwise, the gas detection value is normal.

[0025] like If so, the gas detection value is determined to be abnormal;

[0026] like If the gas detection value is normal, then the gas detection value is determined to be normal.

[0027] Example 2 is an improvement upon Example 1. This portable gas alarm detection method based on multi-sensor fusion determines the accuracy of the gas detection value by: acquiring the zero-point value of the target device, denoted as... The zero-point value is the initial gas concentration value read by the sensor after the target device is turned on in clean air and preheated for 5 minutes. It is the actual zero-point value read and is used to verify whether the reference reading of the sensor is accurate in the absence of target gas. It is a key indicator for judging whether the sensor is working properly. The target device is a portable gas alarm detection device.

[0028] Verify the function using zero point. To determine whether the zero-point deviation meets the standard, that is, whether the deviation between the actual zero-point value and the target zero-point value is within the allowable range, indicating that the sensor's zero-point calibration is accurate, this is used to ensure the accuracy of the sensor's readings in a gas-free environment, providing a reliable benchmark for subsequent testing. ;in, The target zero point value is when the detected gas is a combustible gas ( ), toxic gases (such as , When ), the target zero point value The value is 0 when the detected gas is oxygen ( When ), the target zero point value It was 20.9%. This is the allowable value for zero-point deviation, such as ±1% or ±0.5%, used to determine whether the zero-point deviation meets the standard. This applies when the detected gas is a combustible gas. ), toxic gases (such as , When ), the allowable value of zero-point deviation ±1%, when the detected gas is oxygen ( When ), the allowable value of zero-point deviation ±0.5%; if If the zero-point deviation meets the standard, then it is determined that the zero-point deviation is acceptable; if If so, the zero-point deviation is deemed unacceptable;

[0029] The range value of the target device is collected and denoted as... The range value of the target device is the gas concentration value read by the sensor after introducing a standard gas (such as 50% LEL methane) to the target device at 40%-60% of its full capacity; this is verified through the range verification function. To determine whether the range deviation meets the standard, that is, whether the sensor's range calibration is accurate and whether it can accurately measure the concentration of the target gas: ;in, The target range value for the standard gas. This is the allowable range deviation value, such as ±3%, used to determine whether the range deviation meets the standard; if If the range deviation is within acceptable limits, then the measurement range deviation is considered acceptable; if If so, the range deviation is determined to be substandard;

[0030] The response time of the target device is collected and denoted as... The response time of the target device is the total time from the introduction of gas to the time when the reading stabilizes at 90% of the target value; the response time verification function is used. Determine if the response time meets the standard: Where 30 represents 30 seconds, used to determine whether the response time meets the standard. If the response time is less than 30 seconds, the response time meets the standard; otherwise, the response time does not meet the standard. If the response time meets the standard, then the response time is considered to be satisfactory; if If so, the response time is deemed unacceptable;

[0031] By detecting the comprehensive judgment function To determine whether the gas detection value is accurate: ;in, This indicates that all of the conditions must be met simultaneously. This means "or", meaning that either condition must be met; if If so, the gas detection value is considered accurate; if If the gas detection value is inaccurate, then an environmental interference analysis will be performed.

[0032] The environmental interference analysis specifically involves collecting the temperature and humidity of the target environment, denoted as follows: and The target environment is the environment in which the target device is used; determined by a temperature and humidity function. To determine whether the temperature and humidity of the target environment are abnormal, i.e., whether they will affect the accuracy of the gas detection equipment: ;in, This indicates that it belongs to, i.e., the temperature of the target environment. Within the temperature range of -20℃ to 50℃ This indicates that it does not belong to the target environment, specifically the temperature. The temperature is not within the range of -20℃ to 50℃. -20℃ and 50℃ are the lower and upper limits of the threshold range for determining whether the temperature of the target environment is normal, respectively. If the temperature of the target environment... If the temperature is within the range of -20℃ to 50℃, the target environment temperature is normal; otherwise, it is abnormal. A RH value of 95% is used to determine the humidity of the target environment. Is it within the normal threshold, such as the humidity value of the target environment? A RH level less than 95% indicates normal humidity in the target environment; otherwise, it is abnormal. If the temperature and humidity of the target environment are normal, then it is determined that the environment is normal; if If so, the temperature and humidity of the target environment are determined to be abnormal;

[0033] Collect the values ​​of interfering gases in the target environment, and record them as follows: The interfering gas value is the collected The gas value is used for detection. The parameters collected at that time, if detected There are nearby Gases may produce negative readings, potentially interfering with the accuracy of the collected parameters and leading to inaccurate displayed values. This can be addressed using a cross-interference detection function. Determine if there are interfering gases in the target environment: ;in, This represents an empty set, used to determine whether cross-interfering gases exist in the target environment. If the interfering gas value in the target environment is empty, it means that no interfering gas value was collected in the target environment, i.e., no cross-interfering gases exist in the target environment. If the interfering gas value in the target environment is not empty, it means that interfering gas values ​​were collected in the target environment, i.e., cross-interfering gases exist in the target environment. If so, it is determined that there are no interfering gases in the target environment; if If so, it is determined that there are interfering gases in the target environment;

[0034] Determining function based on pressure change To determine whether the target environment is in a depressurized, confined space state, that is, whether the change in oxygen concentration is within the normal range under depressurized conditions: ;in, The oxygen reading drop threshold is used to determine whether the target environment is in a depressurized state within a confined space, such as... It is 0.5%. This represents the change in oxygen reading. The total time from the initial abrupt change in oxygen reading to its return to stability is used to determine whether the target environment is in a depressurized, confined space state by monitoring changes in oxygen sensor readings; if... If so, the target environment is determined to be in a depressurized, enclosed space; if If so, it is determined that the target environment is not in a depressurized, enclosed space.

[0035] The usage time of the target device is collected and recorded as follows: The usage time of the target device is actually the usage time of the sensors on the target device; through the lifespan determination function. Determine whether the target device is within its effective lifespan: ;in, For the effective lifespan of the sensor, such as The 36-month period is used to determine whether the target device is within its effective lifespan. If the sensor has been used for 24-36 months, the target device is within its effective lifespan; otherwise, it is not. The target device being outside its effective lifespan will affect the accuracy of the output detection values ​​when performing gas detection. If so, the target device is determined to be within its effective lifespan; if If so, the target device is determined to be outside its effective lifespan;

[0036] Based on the comprehensive environmental judgment function To determine if there is environmental interference in gas detection: ;like If environmental interference is detected, the gas detection is determined to be affected, and this is marked as such until the environment stabilizes, i.e., after eliminating environmental interference, the accuracy of the gas detection value is reassessed. If there is no environmental interference in the gas detection, then the gas detection value is determined to be inaccurate.

[0037] Example 3 is an improvement on Example 2. In this example, the cause of the anomaly is analyzed, specifically: battery health is analyzed; if the battery health is deemed questionable, a reading drift check is performed to determine if the reading is within the deviation range, i.e., whether reading drift exists. This is used to determine whether the detector reading is stable when the battery power is low, thereby judging the battery health status. By detecting whether the sensor reading deviates due to voltage instability when the battery power is low, the reliability of the detection results is ensured. When the target device's power is less than 30%, its reading deviation, i.e., the difference between the reading and the actual value, is recorded. It is determined whether the reading is higher or lower than the actual value within 5%-15%. If it is within 5%-15%, it indicates a large reading deviation, possibly caused by unstable battery voltage; conversely, it indicates a small reading deviation. ;in, This represents the actual detected gas concentration value. The actual concentration value of the standard gas or the true concentration value under known conditions; if If the reading is outside the deviation range, then it is determined that the reading is outside the deviation range; if If so, the reading is determined to be within the deviation range;

[0038] By checking for sluggish response, determine whether the T90 response time meets the requirements: ;in, The T90 response time is indicated by 45, which represents 45 seconds. It's used to determine if the T90 response time meets requirements, i.e., whether there is a significant delay in the sensor's response speed. It's also used to assess whether the sensor's response time increases when the battery is low or aging, thus evaluating the sensor's performance. If the T90 response time is greater than 45 seconds when the sensor is low or the battery is aging, it indicates that the sensor's response time has increased; conversely, if it is less than 45 seconds, it indicates that the response time has not increased. If so, the T90 response time is deemed unacceptable; If so, the T90 response time is deemed to meet the requirements;

[0039] By checking the negative pressure display, we can determine whether the negative pressure display meets the requirements. Specifically, we can determine whether the sensor displays a negative pressure when the battery power is low, thereby judging the battery's health status. ;in, Indicates -3ppm, express- ppm, if the actual gas concentration value detected by the gas detector is between -3ppm and - A reading within the ppm range indicates that the gas detector is displaying a negative value in clean air, typically due to insufficient battery voltage causing zero-point calibration failure; if... If so, the negative pressure display is deemed not to meet the requirements; If so, the negative pressure display is deemed to meet the requirements;

[0040] By performing a random jump check, it is determined whether the random jump meets the requirements. This is used to determine whether the sensor readings show abnormal fluctuations when the battery voltage is unstable, thereby assessing the battery's health status. ;in, This represents the fluctuation range of readings recorded in a gas-free environment. If the fluctuation of the detector reading exceeds ±5% of the range in a gas-free environment, it indicates the presence of random fluctuations; otherwise, it indicates the absence of random fluctuations. If the random jump does not meet the requirements, then it is determined that the random jump does not meet the requirements; if If so, the random jump is deemed to meet the requirements;

[0041] By checking for nonlinear errors, it is determined whether the sensor's error at high concentrations meets the requirements. Specifically, it is determined whether the sensor exhibits nonlinear errors due to insufficient battery voltage at high concentrations, thereby evaluating the sensor's performance. ;in, This represents the error value at high concentrations. If the sensor error exceeds 10% at high concentrations, it indicates the presence of nonlinear error; otherwise, it indicates the absence of nonlinear error. If so, the sensor's error at high concentrations is deemed unacceptable; if If so, the sensor's error at high concentrations is deemed to meet the requirements;

[0042] By checking for abnormal shutdowns, we can determine whether the target device is experiencing any abnormal shutdowns, specifically whether the battery is suddenly shutting down due to excessive internal resistance at low charge levels, thereby assessing the battery's health status. ;in, This represents the remaining percentage of battery charge. This indicates that the device has automatically shut down due to insufficient battery power. This indicates that the device did not automatically shut down due to insufficient power. The value is used to determine whether the device is malfunctioning due to insufficient battery power; if If so, it is determined that the target device has an abnormal shutdown situation; if If so, it is determined that the target device does not have an abnormal shutdown condition;

[0043] The battery level-error correlation test determines whether there is a correlation between the error value of the target device and the battery level, which is used to determine whether the battery health condition affects the accuracy of the test results. ;in, The error value recorded when the target device's power is at 100% and it is tested using standard gas. The error value recorded when the target device's battery level is 50% and it is tested using standard gas. The error value recorded when the target device's battery level is 20% and tested using standard gas is [value missing]. The output is This indicates a clear correlation between battery charge and detection error, meaning that battery issues may be the cause of inaccurate detection. The output is This indicates that there is no significant correlation between battery charge and detection error; if If so, it is determined that the error value of the target device is related to the power consumption; if If so, it is determined that the error value of the target device is not related to the power consumption;

[0044] Voltage stability testing determines whether the target device's dynamic voltage drop meets requirements, i.e., whether the battery can maintain a stable voltage output under high load, thereby assessing the battery's health status. ;in, This indicates 0.3V and is used to determine whether the dynamic voltage drop of the target device meets the requirements. For static voltage, the battery voltage should be >3.7V when the device is powered on and in standby mode. For dynamic voltage, a high-concentration gas is introduced to trigger an audible, visual, and vibration alarm, and the voltage drop is observed. This refers to the voltage drop of the battery under dynamic conditions. A positive value indicates that the battery voltage is unstable under dynamic conditions (such as during an alarm), while a negative value indicates that the battery voltage is stable under dynamic conditions (such as during an alarm). If the target equipment's dynamic voltage drop does not meet the requirements, then it is determined that the dynamic voltage drop of the target equipment does not meet the requirements; if If so, the dynamic voltage drop of the target device is deemed to meet the requirements;

[0045] By verifying the full-charge battery life reduction, we can determine whether the target device's full-charge battery life reduction meets the requirements, and use this to assess the overall health and remaining lifespan of the battery. ;in, This represents 16.8 hours. The average battery life from 100% charge to automatic shutdown is considered the battery health level. If the average battery life is less than 16.8 hours, the battery health level is less than 70%; otherwise, the battery health level is greater than 70%. If so, it is determined that the target device's full-charge battery life reduction does not meet the requirements; if If so, it is determined that the battery life reduction of the target device on a full charge meets the requirements;

[0046] By comprehensive judgment function , determine whether the gas alarm detection is caused by an unhealthy battery: ; If , it is determined that the gas alarm detection is caused by an unhealthy battery; then, perform calibration according to the cause of the abnormality until it is determined that the gas detection value is accurate; if , it is determined that the gas alarm detection is not caused by an unhealthy battery; then, give an alarm to indicate that the device is abnormal and replace the device in time.

[0047] Among them, analyze the battery health, specifically: perform a zero-point self-check step and record the zero-point inspection results every day;

[0048] Control the target device to automatically simulate the hand fanning method to generate a step change in gas concentration;

[0049] Through reading classification analysis, analyze and determine the type of response speed to judge whether there is a problem with the sensor response: ; Among them, is the time from when the gas is introduced to when the sensor starts to respond, represents immediate responsiveness, 3 represents 3s, if , it means that the response speed is very fast, and the value starts to rise within 3 seconds, indicating that the sensor response performance is good, represents delayed response type, 10 represents 10s, if , it means that the response speed is delayed, and the value starts to change within 3 - 10 seconds, indicating that the sensor may have mild aging or a slightly blocked filter, represents non-response type, 30 represents 30s, if , it means no response, and the value remains unchanged after 30 seconds, indicating that the sensor may have serious problems, such as a blocked gas path or a damaged sensor;

[0050] Through actual measurement of the T90 response time, judge whether the sensor response speed is qualified to evaluate the dynamic response performance of the sensor through the T90 response time and ensure that gas changes can be quickly detected in an emergency: ; Among them, is the time from when the gas is introduced to when the reading stabilizes to 90% of the target value, represents 30s; if , it means that the T90 response time is less than 30 seconds, then it is determined that the sensor response speed is qualified; if , it means that the T90 response time exceeds 30 seconds, then it is determined that the sensor response speed is unqualified;

[0051] Through gas path blockage troubleshooting, check the gas path smoothness, judge whether the gas path is smooth, and judge whether the gas path is smooth by checking the response time and recovery time to ensure that the gas can flow to the sensor normally: ; Among them, The time from the introduction of gas to the start of the sensor's response. The time from gas removal to sensor readings recovering to background levels; if If the response time exceeds 60 seconds and the recovery time exceeds 60 seconds, it indicates that there is a blockage in the airway; if If the response time and recovery time are both within the normal range, then it is determined that there is no blockage in the gas path;

[0052] Through the first analytical function To determine whether the battery's health is questionable, and to form the first analytical conclusion: ;like If the battery health is questionable, then the battery's health is deemed doubtful; if If so, the battery health is considered normal;

[0053] Perform the second analysis; this includes a zero-point self-check step, recording the daily zero-point check results. The specific steps are: S1, Environmental Selection: Select an open area upwind, away from exhaust vents, paint areas, and areas with high pollen density. Avoid operating in enclosed spaces such as garages and storage rooms where residual gases may exist. S2, Stabilization Time: After powering on, preheat for 3-5 minutes to stabilize the polarization of the electrochemical sensor. S3, Dynamic Observation: Observe the reading fluctuation range within 30 seconds. Determine if the fluctuation amplitude is below ±0.5%. Fluctuations between -0.2% and +0.3% for combustible gas are acceptable; a constant level of 1.2% is abnormal. If the fluctuation amplitude is ≤ ±0.5%, output... If the fluctuation range is greater than ±0.5%, then output S4. Multi-sensor synchronous check: Simultaneously observe all sensor channels. For the oxygen channel, if the power-on display shows 19.5% with no fluctuation, it may be due to sensor poisoning or aging. In this case, the output... Conversely, output For the VOCs channel (PID), the baseline current in clean air should be stable. If it continues to rise above 5 ppm, UV lamp contamination needs to be checked, and the output should be adjusted accordingly. Conversely, output S5. Abnormal reading depth analysis: Analyzes abnormal readings; when a negative value appears (i.e., the sensor displays a negative value), an output is generated. This usually indicates a drift in the sensor's reference voltage or a circuit leakage, requiring immediate calibration. If calibration is ineffective, the sensor may need to be replaced; otherwise, the output... When there is a sustained positive deviation, meaning the sensor reading is consistently higher than the actual value, the output... Common causes include sensor filter contamination, residual moisture in high-humidity environments, and gas diffusion from adjacent work areas; conversely, output... When the nighttime deviation is large, i.e., the diurnal temperature range is large, the output... Check if the instrument has a temperature compensation function. Sensors without compensation are prone to zero-point drift when there are large day-night temperature differences, and vice versa. By observing the changing trend of sensor readings and background environmental conditions, determine which situation it belongs to; S6, Recording Requirements: Record the daily zero-point check results. If the deviation is greater than 1% for three consecutive days, it needs to be included in the calibration plan. At this time, output... Conversely, output .

[0054] Specifically, the second analysis involves using the low-reporting early warning determination function. To determine if the target equipment's low-concentration gas leak warning function is functioning properly, ensuring that the equipment can quickly and effectively issue an alarm in the event of a low-concentration gas leak, thus protecting personnel safety: ;in, For trigger time, To determine the decibel value of the alarm sound, the target device is purged with gas at 1.2 times the alarm set value. If the trigger time is less than 10 seconds, the first-level warning triggering function of the target device is normal; otherwise, it is abnormal. A decibel meter is used to measure the alarm sound at a distance of 30cm from the target device. If the decibel value is greater than 85dB, the first-level warning function of the target device is normal; otherwise, it is abnormal. When both functions are normal, the low-concentration gas alarm function is normal, meaning the device can issue an alarm promptly under low-concentration gas conditions. Conversely, if both functions are abnormal, the low-concentration gas alarm function is abnormal, meaning the device cannot issue an alarm promptly under low-concentration gas conditions. If so, the low alarm warning function of the target device is determined to be normal; if If so, the target device's low alarm warning function is determined to be abnormal;

[0055] High-alert judgment function To determine if the high-alarm warning function of the target device is functioning properly, a dual visual and tactile alarm is provided through vibration and rapid flashing of a red light, ensuring that it can attract attention even in noisy or poorly lit environments. ;in, This indicates that the device has triggered the vibration alarm function. This indicates that the device has not triggered the vibration alarm function. This indicates that the device has triggered the red light flashing alarm function. This indicates that the device has not triggered the red light flashing alarm function; if If the alarm function of the target device is normal, it is determined that the device can issue an alarm in a timely manner in noisy or poorly lit environments; if If the alarm function of the target device is abnormal, it is determined that the device cannot issue an alarm in a timely manner in a noisy or poorly lit environment.

[0056] Limit alarm judgment function To determine if the short-term exposure limit alarm function of the target equipment is functioning properly, ensuring that the equipment can issue an alarm in a timely manner when the gas concentration exceeds the short-term exposure limit or the time-weighted average, thus protecting personnel from long-term exposure to harmful gases: ;in, This indicates that the Short-Term Exposure Limit (STEL) or Time-Weighted Average (TWA) alarm function has been triggered normally. This indicates that both the Short-Term Exposure Limit (STEL) and Time-Weighted Average (TWA) alarm functions cannot be triggered normally; if If so, the short-term exposure limit alarm function of the target equipment is deemed to be normal; if If so, the short-term exposure limit alarm function of the target device is determined to be abnormal;

[0057] Quantitative analysis function based on alarm error The system determines whether the deviation between the actual alarm concentration and the set value of the target device meets the requirements. This involves comparing the actual alarm value with the set value to assess the alarm accuracy and ensure that the device issues an alarm at the correct time. ;in, This represents the actual gas concentration value at the time of the alarm. If the preset alarm threshold is... The output is This indicates that the actual alarm concentration deviates from the set value by less than ±10%, and the alarm error is within the allowable range. The output is This indicates that the actual alarm concentration deviates from the set value by more than ±10%, and the alarm error exceeds the allowable range; if If the actual alarm concentration of the target device deviates from the set value, it is determined that the deviation meets the requirements; if If the actual alarm concentration of the target device deviates from the set value, it is determined that the deviation is not in line with the requirements.

[0058] False alarm simulation judgment function Determine whether the target device has intelligent anti-interference capabilities: ;in, This indicates that the equipment did not generate a false alarm when the interfering gas was introduced. This indicates that the device triggered a false alarm when interfering gas was introduced, verifying whether the device has intelligent anti-interference capabilities to ensure that it will not trigger false alarms due to non-target gases in complex environments; if If so, the target device is determined to have intelligent anti-interference capabilities; if If so, it is determined that the target device does not have intelligent anti-interference function;

[0059] By confirming the reset determination function To determine if the target device's confirmation and reset functions are working properly, ensure that the device can correctly pause and reset after an alarm, and avoid continuous alarms interfering with normal operation: ;in, The alarm can be paused by pressing the confirmation button. This indicates that the alarm cannot be paused using the confirmation button. The time from removal from the gas environment to automatic reset of the equipment readings; 60 represents 60 seconds. If so, the confirmation and reset functions of the target device are deemed to be normal; if If so, the confirmation and reset functions of the target device are determined to be abnormal;

[0060] Deep inspection via display screen To determine if the target device's display screen is functioning correctly, ensuring the accuracy of the display and settings, and providing clear and accurate readings and an intuitive user interface: ;in, This indicates that the display screen has no dark spots, bright spots, or missing lines, and the characters are clear without ghosting. This indicates that the display screen has dark or bright spots, missing lines, or unclear characters with ghosting. This indicates uniform backlighting. This indicates uneven backlighting. This indicates that the backlight brightness is adjustable. This indicates that the backlight brightness is not adjustable. This indicates that the unit and range settings are correct and there is no confusion. This indicates that the unit and range settings are incorrect and confusing; if If so, the target device's display screen is deemed to be functioning normally; if If so, the display function of the target device's screen is determined to be abnormal;

[0061] Data storage inspection To determine whether the target device's data storage function is normal, ensuring the integrity and security of data records, and facilitating subsequent auditing and analysis: ;in, This indicates that the timestamps are continuous and without jumps. This indicates that the timestamps are not consecutive and have abrupt changes. This indicates that alarm events, calibration records, zero-point check results, etc., are all fully recorded. This indicates that alarm events, calibration records, zero-point check results, etc., are incomplete. This indicates that the log file is encrypted and cannot be modified after export. This indicates that the log file is not encrypted and can be modified after export; if If so, the data storage function of the target device is determined to be normal; if If so, the data storage function of the target device is determined to be abnormal;

[0062] Wireless transmission stability test To determine if the target device's communication function is normal, ensure the stability and integrity of wireless transmission, and guarantee that the device can still work normally and recover data when communication is interrupted: ;in, For data packet loss rate, The number of data entries cached locally. This indicates that the signal strength meets the requirements. This indicates that the signal strength does not meet the requirements. This indicates that the uploaded data and the local data have the same MD5 checksum, meaning the data consistency is good. This indicates that the MD5 checksum of the uploaded data does not match that of the local data, indicating poor data consistency. This indicates that the automatic retransmission function is working properly. This indicates a problem with the automatic retransmission function; if If so, the target device's communication function is determined to be normal; if If so, the target device's communication function is determined to be abnormal;

[0063] Through the second analysis function To determine whether the target device's functionality is questionable, a second analytical conclusion is formed: ;

[0064] like If so, the device function of the target device is deemed suspicious;

[0065] like If so, the target device is determined to be functioning normally;

[0066] Perform the third analysis.

[0067] The third analysis involves calculating the target device's equivalent full-charge range to assess the battery's health, denoted as... : ;in, For the first Initial battery percentage upon first power-on For the first The percentage of battery remaining when the device is turned off for the first time. For the first The working time during the first use is the first First use record, This represents the total number of records.

[0068] Battery life determination function Determine the battery health of the target device: ;in, This indicates that the target device's battery health is greater than 90%. This indicates that the target device's battery health is between 70% and 90%. This indicates that the target device's battery health is less than 70%. This indicates 21.6h. This indicates 16.8h;

[0069] The charging efficiency degradation tracking method is used to determine whether the target device has battery aging, that is, to assess the degree of battery aging by charging time: ;in, The time required to charge the battery from 0% to 100%. Indicates 2h, Indicates 6h; if If so, it is determined that the target device has an aging battery; if If so, it is determined that the target device does not have a battery aging problem;

[0070] When the target device is at a low battery level (SOC < 25%), determine if there are any abnormal performance events due to low battery status, in order to evaluate the battery's performance and stability at low battery levels. ;in, This represents the percentage change in battery charge within one minute. This represents the fluctuation value of the concentration reading after the standard gas is introduced. This represents the remaining percentage of battery charge. This indicates that the device has automatically shut down due to insufficient battery power. This indicates that the device did not automatically shut down due to low battery. Used to determine whether the battery can function normally when the charge is low; if If so, it is determined that the target device has a low battery performance abnormality event; if If so, it is determined that the target device does not have a low battery performance abnormality event;

[0071] Determining the charging temperature function To determine whether any abnormal temperature events occur during the charging process of the target device, these parameters are used to assess the battery's temperature performance during charging and to determine if there is a risk of overheating. ;in, This is the highest temperature during the charging process. The rate of temperature rise during charging. Indicates 50℃. Indicates 1℃ / min; if If so, it is determined that an abnormal temperature event occurred during the charging process of the target device; if If so, it is determined that there is no abnormal temperature event during the charging process of the target device;

[0072] Record the power consumption of the target device each time it is powered on. ;

[0073] Statistical analysis of deep discharge events in target devices; by recording these events, battery usage habits and health status can be assessed. ;in, This represents the initial battery percentage upon startup; if If so, it is determined that a deep discharge event has occurred in the target device; if If so, it is determined that no deep discharge event has occurred in the target device;

[0074] Calculate the overall battery health score of the target device, denoted as To comprehensively assess the health status of the battery: ;in, The equivalent full-charge range is a weighting coefficient reflecting the actual battery capacity. It has the highest weight (0.4) and is a core indicator for assessing battery health, representing the importance of the equivalent full-charge range in the overall score. The weighting coefficient for charging efficiency reflects the battery's internal resistance and aging level; it is 0.3, indicating the importance of charging efficiency in the overall score. The weighting coefficient for the number of deep discharge cycles reflects the damage to the battery caused by user habits; a value of 0.2 indicates the importance of the number of deep discharge cycles in the overall score. This is a weighting coefficient for temperature performance, reflecting the battery's thermal management capability. A value of 0.1 indicates the importance of temperature performance in the overall score. To provide the equivalent full-charge range of the new battery, This represents the equivalent fully charged range of current batteries. Charging time for the new battery, The current charging time for the battery. For the number of deep discharges, For the rated operating temperature, This refers to the actual highest charging temperature.

[0075] By scoring classification function The type of battery health of the target device is determined by comprehensive analysis: ;in, This indicates excellence. The condition is good; at this point, a yellow alert is issued, and the assessment period is shortened to two weeks. This indicates a passing grade; an orange alert is now issued, and preparations should be made to replace the battery. This indicates a failure; a red alert will be issued, and the device will be immediately discontinued.

[0076] Battery life is predicted based on cycle count, where cycle count refers to the number of times a battery completes one full charge-discharge cycle, i.e., charging from 0% to 100% and then discharging back to 0% constitutes one full cycle. The baseline cycle life of the target device's battery is collected, which is the cycle life obtained by the battery manufacturer through laboratory testing (standard charge-discharge conditions). The battery's life is also recorded using a built-in fuel gauge. (Power-on battery level) and (Power off), then the equivalent of a single cycle is: The total number of loops is ; Calculate the theoretical lifespan, Actual lifespan correction is implemented. When the battery health is in the first 75% of its range, capacity decay is slow, consuming approximately 400 cycles. When the battery health is in the last 25% of its range, capacity decays rapidly, consuming approximately 200 cycles, but the time percentage is significantly shorter. Therefore, the actual usable lifespan is approximately 4-6 years. A replacement decision tree is established: when the battery health exceeds 85% (approximately the first 300 cycles), normal use is allowed. When the battery health is between 75-85% (approximately 300-450 cycles), checks are performed every two weeks, and spare parts are prepared. When the battery health is between 65-75% (approximately 450-550 cycles), new batteries are immediately procured, and the battery is equipped for critical operations. When the battery health is less than 65% (more than 550 cycles), use is stopped, and the battery is forcibly replaced.

[0077] Through the third analytical function To determine whether the battery condition of the target device is suspicious, a third analytical conclusion is formed: ;like If so, the battery condition of the target device is deemed suspicious; if If so, the battery condition of the target device is determined to be normal;

[0078] Through comprehensive battery analysis To determine whether the battery health of the target device is questionable: ;like If the battery health is questionable, then the battery's health is deemed doubtful; if If the gas alarm is detected, the battery health is determined to be normal; if not, the gas alarm detection is determined to be not caused by an unhealthy battery; if so, the alarm indicates that the device is malfunctioning and the device should be replaced promptly.

[0079] This embodiment also provides that corrections are made based on the cause of the anomaly until the gas detection value is determined to be accurate. Specifically, when the battery health level is <70%, i.e. When the number of battery cycles exceeds 500 or irreversible capacity decay occurs, perform a battery replacement operation; when the battery health is greater than 70%, i.e. or However, if deep discharge occurs due to long-term storage, perform a charging recovery operation, that is, use 5V / 1A slow charging mode to charge for 30 minutes to avoid large current impact damaging the battery. After charging to 100%, continue trickle charging for 30 minutes to ensure accurate calibration of the fuel meter. After charging is complete, reset the instrument date and time.

[0080] After performing a battery replacement or charging recovery operation, a forced calibration process is executed. In extreme cases where calibration is not possible, if a "gain too high / too low" alarm is displayed during range calibration after zero-point calibration, the cause may be that long-term undervoltage operation has led to performance degradation of the op-amp chip. The solution is to replace the motherboard or return it to the factory for repair. If the response time is >60 seconds and cannot be restored by cleaning, the cause may be that the sensor electrolyte decomposes abnormally when the battery voltage is unstable. The solution is to replace the sensor. If the reading shows non-linear jumps and the error at each point is irregular after calibration, the cause may be that long-term voltage ripple interference has led to reference source drift. The solution is to replace the MCU or calibration chip.

[0081] After calibration, proceed with the step of determining whether the gas detection value is accurate; if the gas detection value is determined to be accurate, stop the calibration; if the gas detection value is determined to be inaccurate, continue the calibration until the gas detection value is determined to be accurate.

[0082] The forced calibration procedure is as follows: Select a clean air or high-purity nitrogen environment, power on and preheat for 10 minutes to stabilize the voltage of the new battery, enter the calibration menu, select "Zero Point Calibration," and continuously purge with zero-point gas for 3 minutes to ensure complete replacement of the sensor cavity, until the zero-point value stabilizes at 0±1%. The value is 20.9±0.2%; use a certified standard gas with 40%-60% full scale, such as 50% LEL methane, and control the flow rate at 300-500 ml / min to avoid airflow impact causing sensor output fluctuations. Connect the calibration cap to ensure that the gas only flows through the target sensor. Purge for 3 minutes, and after the reading stabilizes, input the standard gas concentration value. Wait for the instrument to automatically adjust the gain coefficient and save the calibration parameters until the error between the displayed value and the standard gas value is ≤±3%. Set five test points: zero point, 25% range, 50% range, 75% range, and full scale. Determine whether the error at each point is ≤±5% and the maximum-minimum error difference is ≤3% to confirm that the linearity across the entire range is not affected by voltage changes after battery replacement. If both requirements are met, stop the forced calibration process. If either requirement is not met, continue calibration until both requirements are met.

[0083] This embodiment ensures the accuracy of gas detection values ​​and reduces false alarms and missed alarms through multi-step verification and calibration. It extends the service life of gas detection equipment and reduces equipment replacement costs through battery health management and timely calibration. In critical operations, it ensures the reliability and stability of the equipment and protects the safety of personnel and equipment. Through intelligent prediction and health management models, it predicts battery life in advance, optimizes maintenance strategies, and reduces unexpected downtime.

Claims

1. A portable gas alarm detection method based on multi-sensor fusion, characterized in that: include: Determine if the gas detection value is accurate; If the gas detection value is accurate, then determine whether the gas detection value is abnormal; If the gas detection value is abnormal, an alarm will be triggered. If the gas detection value is normal, the detection value will be displayed normally; If the gas detection value is inaccurate, analyze the cause of the anomaly; Correct the error based on the cause until the gas detection value is determined to be accurate. After calibration, determine whether the gas detection value is abnormal; If the gas detection value is abnormal, an alarm will be triggered. If the gas detection value is normal, the detection value will be displayed normally; The specific causes of the anomaly are as follows: Analyze battery health; If the battery health is deemed questionable, a reading drift check is performed to determine whether the reading is within the deviation range. like If so, the reading is determined to be outside the deviation range; like If so, the reading is determined to be within the deviation range; By checking for slow response, it can be determined whether the T90 response time meets the requirements; like If so, the T90 response time is determined to be unacceptable; like If so, the T90 response time is deemed to meet the requirements; The negative pressure display is checked to determine whether it meets the requirements. like If so, the negative pressure display is deemed not to meet the requirements; like If so, the negative pressure display is deemed to meet the requirements; The random transition check determines whether the random transition meets the requirements. like If so, the random jump is deemed not to meet the requirements; like If so, the random jump is deemed to meet the requirements; By checking the nonlinear error, it is determined whether the sensor's error at high concentrations meets the requirements; like If so, the sensor's error at high concentrations is deemed unacceptable. like If so, the sensor's error at high concentrations is deemed to meet the requirements; By checking for abnormal shutdowns, it can be determined whether the target device has any abnormal shutdown issues. like If so, it is determined that the target device has an abnormal shutdown situation; like If so, it is determined that the target device does not have an abnormal shutdown condition; By conducting a power-error correlation test, it can be determined whether there is a correlation between the error value and the power consumption of the target device. like If so, it is determined that the error value of the target device is related to the power consumption; like If so, it is determined that the error value of the target device is not related to the power consumption; Voltage stability testing is used to determine whether the dynamic voltage drop of the target equipment meets the requirements. like If so, the dynamic voltage drop of the target equipment is determined to be non-compliant. like If so, the dynamic voltage drop of the target device is deemed to meet the requirements; The full-charge battery life degradation verification determines whether the target device's full-charge battery life degradation meets the requirements, and is used to assess the overall health and remaining lifespan of the battery. like If so, it is determined that the target device's full-charge battery life reduction does not meet the requirements; like If so, it is determined that the battery life reduction of the target device on a full charge meets the requirements; By comprehensive judgment function To determine whether the gas alarm detection is caused by an unhealthy battery; like If so, the gas alarm detection is determined to be caused by an unhealthy battery; Then, corrections are made based on the cause of the anomaly until the gas detection value is determined to be accurate; like If so, it is determined that the gas alarm detection is not caused by an unhealthy battery; If the equipment malfunctions, an alarm will be triggered, and the equipment should be replaced promptly.

2. The portable gas alarm detection method based on multi-sensor fusion according to claim 1, characterized in that: To determine whether a gas detection value is accurate, the following steps are taken: Collect the zero-point value of the target device, denoted as ; Verify the function using zero point. To determine whether the zero-point deviation meets the standard; like If so, the zero-point deviation is deemed to meet the standard; like If so, the zero-point deviation is deemed unacceptable; The range value of the target device is collected and denoted as... ; Verify the function using the range measurement method. To determine whether the range deviation meets the standard; like If so, the range deviation is deemed to be within acceptable limits; like If so, the range deviation is determined to be substandard; The response time of the target device is collected and denoted as... ; Verify the function by response time. Determine whether the response time meets the standard; like If so, the response time is deemed to meet the standard; like If so, the response time is deemed unacceptable; By detecting the comprehensive judgment function To determine whether the gas detection value is accurate; like If so, the gas detection value is determined to be accurate; like If the gas detection value is inaccurate, then an environmental interference analysis will be performed.

3. The portable gas alarm detection method based on multi-sensor fusion according to claim 2, characterized in that: Perform environmental interference analysis, specifically: The temperature and humidity of the target environment were collected and recorded as follows: and ; Determining function based on temperature and humidity To determine whether the temperature and humidity of the target environment are abnormal; like If the temperature and humidity of the target environment are normal, then it is determined that the environment is normal. like If so, the temperature and humidity of the target environment are determined to be abnormal; Collect the values ​​of interfering gases in the target environment, and record them as follows: ; Cross-interference determination function To determine whether there are interfering gases in the target environment; like If so, it is determined that there are no interfering gases in the target environment; like If so, it is determined that there are interfering gases in the target environment; Determining function based on pressure change To determine whether the target environment is in a depressurized, enclosed space; like If so, the target environment is determined to be in a depressurized, enclosed space state; like If so, it is determined that the target environment is not in a depressurized, enclosed space. The usage time of the target device is collected and recorded as follows: ; Lifetime determination function To determine whether the target device is within its effective lifespan; like If so, the target device is determined to be within its effective lifespan; like If so, the target device is determined to be outside its effective lifespan; Based on the comprehensive environmental judgment function To determine whether there is environmental interference in gas detection; like If environmental interference is detected, the gas detection is determined to be affected, and the presence of environmental interference is marked until the environment stabilizes. Then, the gas detection value is reassessed to determine its accuracy. like If there is no environmental interference in the gas detection, then the gas detection value is determined to be inaccurate.

4. The portable gas alarm detection method based on multi-sensor fusion according to claim 1, characterized in that: To determine if a gas detection value is abnormal, the following steps are taken: Obtain the gas detection value and record it as follows: ; Through the exception detection function To determine whether the gas detection value is abnormal; like If so, the gas detection value is determined to be abnormal; like If the gas detection value is normal, then the gas detection value is determined to be normal.

5. The portable gas alarm detection method based on multi-sensor fusion according to claim 1, characterized in that: Analyze battery health, specifically: Perform the zero-point self-check procedure and record the daily zero-point check results; The target device is controlled to automatically simulate a handheld fan method, generating a step change in gas concentration; By analyzing readings, the type of response speed can be determined. The T90 response time is used in a practical test to determine whether the sensor's response speed is up to standard. like If so, the sensor response speed is deemed acceptable; like If so, the sensor response speed is deemed unqualified; By checking for blockages in the airway, the patency of the airway is determined, and whether the airway is clear. like If so, it is determined that there is a blockage in the air passage; like If so, it is determined that there is no blockage in the air passage; Through the first analytical function To determine whether the battery's health is questionable, and to form the first analytical conclusion; like If so, the battery health is deemed questionable; like If so, the battery health is considered normal; Perform the second analysis.

6. The portable gas alarm detection method based on multi-sensor fusion according to claim 5, characterized in that: The second analysis is performed as follows: Low-reporting warning judgment function Determine whether the low alarm warning function of the target device is normal; like If so, the low alarm warning function of the target device is determined to be normal; like If so, the target device's low alarm warning function is determined to be abnormal; High-alert judgment function Determine whether the high-alarm warning function of the target device is normal; like If so, the high-alarm warning function of the target device is determined to be normal; like If so, the high-alarm warning function of the target device is determined to be abnormal; Limit alarm judgment function Determine whether the short-term exposure limit alarm function of the target equipment is normal; like If so, the short-term exposure limit alarm function of the target equipment is determined to be normal; like If so, the short-term exposure limit alarm function of the target device is determined to be abnormal; Quantitative analysis function based on alarm error To determine whether the deviation between the actual alarm concentration of the target device and the set value meets the requirements; like If the actual alarm concentration of the target device deviates from the set value, it is determined that the deviation meets the requirements. like If the actual alarm concentration of the target device deviates from the set value, it is determined that the deviation is not in line with the requirements. False alarm simulation judgment function To determine whether the target device has intelligent anti-interference capabilities; like If so, the target device is determined to have intelligent anti-interference function; like If so, it is determined that the target device does not have intelligent anti-interference function; By confirming the reset determination function To determine whether the confirmation and reset functions of the target device are normal; like If so, the confirmation and reset functions of the target device are deemed to be normal; like If so, the confirmation and reset functions of the target device are determined to be abnormal; Deep inspection via display screen Determine whether the display function of the target device's screen is normal; like If so, it is determined that the display function of the target device's screen is normal; like If so, the display function of the target device's screen is determined to be abnormal; Data storage inspection To determine whether the data storage function of the target device is normal; like If so, the data storage function of the target device is determined to be normal; like If so, the data storage function of the target device is determined to be abnormal; Wireless transmission stability test To determine whether the target device's communication function is normal; like If so, the target device's communication function is determined to be normal; like If so, the target device's communication function is determined to be abnormal; Through the second analysis function To determine whether the device function of the target device is suspicious, and to form a second analytical conclusion; like If so, the device function of the target device is deemed suspicious; like If so, the target device is determined to be functioning normally; Perform the third analysis.

7. The portable gas alarm detection method based on multi-sensor fusion according to claim 6, characterized in that: The third analysis is performed as follows: Calculate the equivalent full-charge range of the target device to assess the battery's health, denoted as . ; Battery life determination function To determine the battery health of the target device; The charging efficiency degradation tracking method is used to determine whether the target device has battery aging. like If so, it is determined that the target device has an aging battery. like If so, it is determined that the target device does not have a battery aging problem; When the target device is at low battery, determine whether there is a low battery performance abnormality event in the target device; like If so, it is determined that the target device has a low battery performance abnormality event; like If so, it is determined that the target device does not have a low battery performance abnormality event; Determining the charging temperature function To determine whether there are any abnormal temperature events during the charging process of the target device; like If so, it is determined that an abnormal temperature event occurred during the charging process of the target device; like If so, it is determined that there is no abnormal temperature event during the charging process of the target device; Record the power consumption of the target device each time it is powered on. ; Statistical analysis of deep discharge events in the target device; like If so, it is determined that a deep discharge event has occurred in the target device; like If so, it is determined that no deep discharge event has occurred in the target device; Calculate the overall battery health score of the target device, denoted as ; By scoring classification function The type of battery health of the target device is determined comprehensively. Predicting battery life based on cycle count; Through the third analytical function To determine whether the battery condition of the target device is suspicious, a third analytical conclusion is formed; like If so, the battery condition of the target device is deemed suspicious; like If so, the battery condition of the target device is determined to be normal; Through comprehensive battery analysis To determine whether the battery health of the target device is questionable; like If so, the battery health is deemed questionable; like If so, the battery health is considered normal; Therefore, it is determined that the gas alarm detection is not caused by an unhealthy battery. If the equipment malfunctions, an alarm will be triggered, and the equipment should be replaced promptly.

8. The portable gas alarm detection method based on multi-sensor fusion according to claim 1, characterized in that: Correct the error based on its cause until the gas detection value is determined to be accurate. Specifically: When the battery health is less than 70%, the number of cycles is greater than 500, or irreversible capacity decay occurs, perform a battery replacement operation. When the battery health is >70%, but deep discharge has occurred due to long-term storage, a charging recovery operation will be performed; After performing a battery replacement or charging recovery operation, a forced calibration procedure is executed. After calibration, proceed with the step of determining whether the gas detection value is accurate; If the gas detection value is determined to be accurate, calibration is stopped. If the gas detection value is determined to be inaccurate, calibration continues until the gas detection value is determined to be accurate.

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