A method and system for monitoring and warning carbon monoxide in a vehicle passenger compartment

Abstract

The present invention discloses a method and system for monitoring and warning carbon monoxide in a vehicle passenger compartment, comprising a gas concentration acquisition module, a gas baseline concentration value calculation module, an alcohol interference determination module and an alarm monitoring module. By utilizing the system and method of the present invention, the influence of drinking alcohol, spraying perfume, and other interfering gas volatilization and release on the carbon monoxide monitoring and warning results in the vehicle can be reduced, thereby improving the accuracy of the carbon monoxide monitoring and warning in the vehicle.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon monoxide monitoring in a vehicle passenger compartment, and in particular relates to a carbon monoxide monitoring and early warning method and system in a vehicle passenger compartment. Background Art

[0002] As cars become more and more closely connected with life, people spend more and more time in their cars. Since the passenger compartment of a vehicle is a relatively closed space, the longer people stay in the car, the lower the air quality in the car will be, and the content of harmful gases will gradually increase. This poses a threat to people's lives and health. In particular, when people park their cars in poorly ventilated places, the engine is idling, and people are resting in the car with the air conditioner on, it may even cause carbon monoxide (CO) poisoning. Therefore, it is necessary to monitor and warn the CO content in the car.

[0003] Considering the limitations of the sensor's installation environment on the vehicle, the cost and life requirements, and the requirements of the use environment, the vehicle generally uses a CO sensor based on the MOX (metal oxide semiconductor) principle. However, in addition to responding to CO, this type of sensor also responds to alcohol. In the current field of gas sensor materials, sensitive materials that can distinguish between CO and alcohol have not yet been found. Therefore, when people on the vehicle drink alcohol, it will have a very large impact and interference on the monitoring and early warning of CO in the vehicle.

[0004] In order to solve the above problems, the existing technology is to use carbon monoxide sensors with better selectivity based on other principles. For example, the infrared CO sensor, although it has good selectivity for CO, requires a very long air chamber with a very large volume to ensure measurement accuracy. In addition, during long-term use of the vehicle, the air chamber is prone to deformation, causing sensor failure. The price of sensors based on this principle is also relatively high. For example, the electrochemical CO sensor, although it can also eliminate the interference of alcohol, has a service life of only about 2 years, and its use environment cannot meet the requirements of vehicle regulations, and is not suitable for vehicle-side application. Summary of the invention

[0005] As described in the background technology, alcohol will interfere with the detection results of carbon monoxide (CO) sensors. How to scientifically and reasonably correct the data measured by the carbon monoxide sensor into data without alcohol interference is the core of the present invention. In order to solve the problem that the presence of alcohol and other interference factors in the passenger compartment interferes with the monitoring of carbon monoxide in the car, the present invention provides a method and system for monitoring and warning carbon monoxide in the passenger compartment of a car that can resist the influence of interference factors such as alcohol.

[0006] A method for monitoring and warning carbon monoxide in a passenger compartment of a vehicle to achieve one of the purposes of the present invention comprises the following steps:

[0007] Step 1, calculating the reference concentration V0 of carbon monoxide gas according to the concentration of carbon monoxide gas collected during the time period T+t1 to T+t2;

[0008] The reference concentration V0 may be the average concentration value within the time period T+t1 to T+t2;

[0009] T is the setting starting time;

[0010] Furthermore, when the vehicle is just powered on, T is the time when the vehicle is powered on; after T+t2, when the vehicle detects that the window or door is opened and then closed, T is the time when the vehicle detects that the window or door is opened and then closed; when the user performs a reset operation for carbon monoxide detection, T is the time when the user performs the reset operation;

[0011] The t1 and t2 are respectively the first set time and the second set time; the first set time t1 is the response time of the gas sensor, that is, the carbon monoxide sensor needs a certain time from power-on to normal measurement of gas concentration, this time is the response time of the sensor, and the value of t1 is related to the specific sensor; the second set time t2 is a set time after the vehicle is powered on and the sensor can normally measure the gas concentration. The data measured by the sensor within this set time t2 is used to calculate the reference concentration value V0, and the reference concentration value V0 is used to determine whether there is alcohol interference in the current vehicle by comparing with the set reference value β. If alcohol interference occurs, the gas concentration data measured by the sensor needs to be corrected;

[0012] If the sensor starts to work normally 30 seconds after the vehicle is powered on at time T, this 30 seconds is the t1 value; assuming that t2 is 20 seconds, but not limited to this value, then the value calculated in step 1 is the baseline concentration V0 of carbon monoxide gas in the time period of T+30s to T+50s after the vehicle is powered on;

[0013] Step 2: After time T+t2, collect the gas concentration value V in the passenger compartment in , according to the reference concentration V0 and the reference value β, determine whether there is alcohol interference in the car;

[0014] The method for judging whether there is alcohol interference in the car includes: when V0≤β, it is considered that there is no alcohol interference in the car, otherwise it is determined that there is alcohol interference in the car. The principle is as follows:

[0015] There are two main sources of CO in the car: one is the CO in the car itself; the other is the CO generated when the vehicle is started and runs and enters the car; the sum of these two parts of CO is the actual CO content in the car; when the vehicle is just powered on, since the engine has just started running, the CO in the car can only be the CO in the car itself.

[0016] There are two main situations in which alcohol interference occurs in the car: one is that there is alcohol in the car when the vehicle is just powered on, and the other is that alcohol appears during the operation of the vehicle, such as when a drunk person gets on the car during the journey.

[0017] It can be seen that at any time T+t after the vehicle is powered on, the actual CO concentration in the vehicle is V out =CO in the car at time T plus CO newly entering the car during the time period T to T+t; CO in the car at time T is the reference value β;

[0018] Similarly, the CO concentration value V measured by the sensor in It is the sum of the following three parts: the reference value β, the CO newly entering the car, and the alcohol interference amount; the sum of the reference value β and the CO newly entering the car is the actual CO content in the car, which is the true value V of the current CO in the car that we want to obtain out Therefore, only V in Subtract the interference from the Vout to get Vout. That is to say, there are the following three calculation formulas:

[0019] V in =β+CO newly entering the car+interference amount D

[0020] V out =β+CO newly entering the vehicle

[0021] V out =V in - Interference amount D

[0022] In the above variables: V in is the data measured by the sensor; the method for setting the reference value β is as follows:

[0023] The CO newly entering the car can be obtained as follows: within a period of time, assuming that the disturbance amount in the car remains unchanged and the reference value β remains unchanged, then V in The change in V0 must be equal to the new CO entering the car. Therefore, we only need to use the data from T+t1 to T+t2 to calculate a baseline concentration V0, and then use V0 to calculate the baseline concentration after T+t2. in Subtract V0 to get V in The change in V is the CO newly entering the car. Therefore, the disturbance D = V in -CO-β newly entering the car, that is, V0-β. Therefore, when V0≤β, it is considered that there is no alcohol interference in the car, otherwise there is alcohol interference.

[0024] The method for setting the above-mentioned reference value β includes:

[0025] When the vehicle is just powered on and connected to the Internet: β is the carbon monoxide concentration value in the current location air quality data read by the vehicle network;

[0026] When the vehicle is just powered on but cannot be connected to the Internet: β is the carbon monoxide concentration in the vehicle detected by the sensor after the set time after the last use of the vehicle; the set time can be set by yourself, such as the carbon monoxide sensor is awakened 5 hours after the last use of the vehicle, and the carbon monoxide concentration in the vehicle is measured and saved once. The next time the vehicle is used, β will take this concentration value; if the interval between the vehicle power-on and the last vehicle power-off is less than the set time (for example, less than 5 hours), β can take a value within the set interval, and the set interval can be (0mg / m 3 , 4mg / m 3 ], the preferred value of β is 4 mg / m 3 ;

[0027] When the user manually resets the vehicle's carbon monoxide alarm module, β is reset to 0;

[0028] Step 3: If there is no alcohol interference, the gas concentration value V out is the gas concentration measured by the sensor; if there is alcohol interference, the gas concentration value V measured by the sensor needs to be out make corrections;

[0029] Gas concentration value V out The correction method is as follows:

[0030] If V in >V0, then:

[0031] V out =V in -V0+β

[0032] The correction principle is as follows. As previously analyzed, there are three calculation formulas:

[0033] V in =β+CO newly entering the car+interference amount D

[0034] V out =β+CO newly entering the vehicle

[0035] V out =V in - Interference amount D

[0036] In the above variables: V in is the data measured by the sensor; the method for setting the reference value β is as above; the CO newly entering the car can be obtained as follows: within a period of time, assuming that the interference amount in the car does not change and the reference value β does not change, then V inThe change in V0 must be equal to the new CO entering the car. Therefore, we only need to use the data from T+t1 to T+t2 to calculate a baseline concentration V0, and then use V0 to calculate the baseline concentration after T+t2. in Subtract V0 to get V in The change in V is the CO newly entering the car. out =V in -V0+β;

[0037] If V in ≤V0, then:

[0038] V out =max{randbetween(β-Δβ,β+Δβ),V in -(V0-β)·e -kt}

[0039] or:

[0040] V out =V in -(V0-β)·e -kt

[0041] Where:

[0042] k is the calibration parameter;

[0043] Δβ is the set allowable initial fluctuation deviation;

[0044] t represents the duration of alcohol dissipation;

[0045] The randbetween(β-Δβ,β+Δβ) indicates generating a random number in the specified range (β-Δβ,β+Δβ); max indicates taking the maximum value;

[0046] This scenario is for alcohol interference detected after the vehicle is powered on or the doors and windows are switched on, but from a certain moment the alcohol gradually evaporates and dissipates, causing V in The value is getting smaller and smaller; therefore, the physical meaning of t is the duration of alcohol dissipation;

[0047] The duration of alcohol dissipation is determined by: V in The cumulative time when the value is less than or equal to the reference concentration V0 value; an example is as follows:

[0048] If V appears for the first time 1min5s after the vehicle is powered on in ≤V0, then t is 0;

[0049] 1min5s~1min8sV in If the values ​​of are all less than or equal to V0, the t value gradually accumulates to 3 seconds;

[0050] 1min8s later V in >V0, t stops accumulating;

[0051] 1min11s later V in ≤V0, t continues to accumulate on the basis of 3 seconds.

[0052] The principle of this calculation formula is as follows:

[0053] There are two scenarios for the change in the amount of interference (alcohol): Scenario 1: the alcohol dissipation is reduced when the vehicle is just powered on; Scenario 2: new alcohol may be introduced again during the use of the vehicle;

[0054] For scenario 1: After establishing a mathematical model with the reference value β unchanged, it can be seen that the change law of the interference amount over time roughly conforms to D(t) = (V0-β)·e -kt Therefore, in this case, V out =V in -(V0-β)·e -kt ;

[0055] Since the CO content in the car will not be less than the reference value β, the further optimization scheme is:

[0056] V out =max{randbetween(β-Δβ,β+Δβ),V in -(V0-β)·e -kt};

[0057] The randbetween(β-Δβ,β+Δβ) indicates generating a random number in the specified range (β-Δβ,β+Δβ); max indicates taking the maximum value

[0058] For scenario 2 or when the value of β changes, these two scenarios have a common feature, that is, there are usually actions of opening and closing windows and doors, and V0 and β need to be reinitialized after the opening and closing of windows and doors are detected. After V0 and β are reinitialized, the calculation returns to scenario 1, that is, the reference value β has been calibrated or unchanged, and the calculation is recalculated.

[0059] Step 4: When the gas concentration value V out When it is greater than the alarm threshold, an alarm message is sent that the carbon monoxide in the car passenger compartment exceeds the standard.

[0060] Furthermore, after step 3, the following steps are further included:

[0061] When any door or window opening and closing signal is detected, the current gas concentration value V out Assign the value of to the correction value β and return to step 1.

[0062] When it is detected that any door or window changes from open to closed, the reference concentration V0 is recalculated by taking the data measured by the sensor during the time period t1 to t2 after this moment.

[0063] A carbon monoxide monitoring and early warning system for a vehicle passenger compartment that realizes the second object of the present invention comprises a gas concentration acquisition module, a gas reference concentration value calculation module, an alcohol interference determination module and an alarm monitoring module;

[0064] The gas concentration acquisition module is used to obtain data on the current carbon monoxide gas concentration in the vehicle from the sensor;

[0065] The gas reference concentration value calculation module is used to calculate the reference concentration V0 of carbon monoxide gas in the time period T+t1 to T+t2 according to the multiple gas concentration values ​​in the time period T+t1 to T+t2 obtained from the gas concentration acquisition module, wherein t1 and t2 are respectively the first set time and the second set time; T is the set time;

[0066] Furthermore, when the vehicle is just powered on, T is the time when the vehicle is powered on; after T+t2, when the vehicle detects that the window or door is opened and then closed, T is the time when the vehicle detects that the window or door is opened and then closed; when the user performs a reset operation for carbon monoxide detection, T is the time when the user performs the reset operation;

[0067] The alcohol interference determination module is used to determine the gas concentration value V in the passenger compartment collected after time T+t2. in and the reference value β to determine whether there is alcohol interference in the car;

[0068] The alarm monitoring module is used to calculate the gas concentration value V out And the alarm threshold is used to alarm when the carbon monoxide in the car passenger compartment exceeds the standard.

[0069] Furthermore, the invention also includes a gas concentration value correction module, which is used to correct the gas concentration value V measured by the sensor when the alcohol interference determination module determines that there is alcohol interference in the current vehicle. out Make corrections.

[0070] By utilizing the system and method described in the present invention, the impact of drinking alcohol, spraying perfume, and the release of other interfering gases on the in-vehicle carbon monoxide monitoring and early warning results can be reduced, thereby improving the accuracy of in-vehicle carbon monoxide monitoring and early warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 is a flow chart of an embodiment of the method of the present invention;

[0072] Figure 2 It is a control signal flow diagram of the method described in the present invention. DETAILED DESCRIPTION

[0073] The following specific implementations are used to explain the technical solutions of the claims of the present invention so that those skilled in the art can understand the claims. The protection scope of the present invention is not limited to the following specific implementation structures. The technical solutions of the claims of the present invention made by those skilled in the art but different from the following specific implementations are also within the protection scope of the present invention.

[0074] Combine the following Figures 1-2 An embodiment of the method of the present invention is described.

[0075] Step 1: After the vehicle is powered on, the carbon monoxide sensor collects gas concentration data in the passenger compartment and transmits it to the control module, which can be a control unit of the vehicle.

[0076] The control module calculates the reference concentration V0 of the carbon monoxide gas according to the concentration of the carbon monoxide gas collected in the time period T+t1 to T+t2; wherein t1 and t2 are the first set time and the second set time respectively;

[0077] When the vehicle is just powered on, T is the time when the vehicle is powered on; after T+t2, when the vehicle detects that the window or door is opened and then closed, T is the time when the vehicle detects that the window or door is opened and then closed; when the user performs a reset operation for carbon monoxide detection, T is the time when the user performs the reset operation;

[0078] In this embodiment, the method for obtaining the value of V0 is:

[0079] V0 is a plurality of gas concentration data values ​​collected during the time period T+t1 to T+t2 after the vehicle is powered on. The average value during this period is obtained based on the plurality of gas concentration data values ​​as the gas concentration reference value V0 in the passenger compartment;

[0080] Among them, t1 is the response time of the gas sensor, that is, it takes a certain amount of time for the CO sensor to measure the gas concentration normally after it is powered on. This period of time is called the sensor response time. The duration t1 is related to the sensor and is generally about 30s. The sensor will output data from the time when the vehicle is powered on at time T to T+t1, but the output data is mostly the initial data set inside the sensor and does not represent the actual situation. Therefore, the data within the sensor response time cannot be included in the calculation;

[0081] t2 is the sensor working normally after waiting for t1 time after power-on. The multiple CO concentration values ​​measured by the sensor in the time period of T+t1 to T+t2 are used to calculate the CO concentration reference value V0. The CO concentration reference value V0 is used to determine whether there is alcohol interference in the car with the reference value β. The t2 value can be set according to actual conditions, such as 30s, but is not limited to this value.

[0082] While analyzing and calculating the V0 value, the control module synchronously initializes the reference value β as follows:

[0083] (1) If the vehicle has just been powered on and is connected to the Internet, the reference value β is the CO concentration in the air quality data at the current location read online;

[0084] (2) If the vehicle has just been powered on but cannot be connected to the Internet, the reference value β is the CO concentration in the vehicle detected by the sensor some time after the last use of the vehicle;

[0085] For example, if the CO sensor is awakened 5 hours after the last use of the vehicle, the CO concentration in the vehicle is measured and saved. The next time the vehicle is used, the reference value β can be taken as this concentration value. If the time interval between the vehicle power-on and the last vehicle power-off is too short (for example, less than 5 hours), and the vehicle cannot be connected to the network, the reference value β can be (0.4mg / m 3 ]; According to relevant data, after a vehicle is parked for a period of time, if it is not in a special place (such as near a fire scene), the carbon monoxide concentration in the vehicle generally does not exceed 4mg / m 3 The reference value β is preferably 4 mg / m 3 ;

[0086] Step 2: After time T+t2, collect the gas concentration value V in the passenger compartment in , based on the reference concentration V0 and the reference value β, determine whether there is alcohol interference in the car. The determination method is as follows:

[0087] After the vehicle is powered on, the control module analyzes and calculates the reference concentration V0 after T+t2, and then compares V0 with β:

[0088] If V0>β, it is considered that there is alcohol interference in the car at this time; the principle is as follows:

[0089] There are two basic situations in which alcohol or other substances that interfere with carbon monoxide monitoring appear in the passenger compartment of a vehicle: the first is that alcohol or other substances are already in the passenger compartment of the vehicle before the vehicle is powered on, such as if there are people drinking alcohol in the vehicle before the vehicle is powered on; the second is that alcohol appears in the passenger compartment during normal use of the vehicle, such as if a person drinking alcohol rides the vehicle midway. In fact, these two situations may occur separately or in combination.

[0090] Because when there are interference factors such as alcohol in the car, alcohol gas will react with the gas-sensitive material in the gas sensor like CO, causing the gas sensor to respond and output data. And once alcohol interference occurs in the car, the alcohol concentration in the above two cases is often relatively large; and the interference caused by low-concentration alcohol is also small, and there is no need to correct low-concentration alcohol interference in engineering. Therefore, V0 is compared with the correction value β. If it is greater than β, it is considered that alcohol interference exists, and the data collected by the sensor needs to be corrected;

[0091] If V0≤β, it is considered that there is no alcohol interference in the car at this time.

[0092] Since the V0 value is obtained after t2 and whether there is alcohol interference in the car, and in order to ensure the consistency of data, the control module will also give the carbon monoxide concentration value in the car before t2. At this time, the concentration value does not require accuracy and can be randomly given within a reasonable range. out =randbetween(β-Δβ,β+Δβ), that is, randomly assign a value to V within the interval of (β-Δβ,β+Δβ) out ;

[0093] Δβ is the allowable initial fluctuation deviation. Generally, a deviation within 5% is considered normal, that is, any value within 5% of the β value is normal. In this embodiment, Δβ=0.05β;

[0094] Step 3: If there is no alcohol interference, the gas concentration value V out is the gas concentration measured by the sensor; if there is alcohol interference, the gas concentration value V measured by the sensor needs to be out To make corrections, follow these steps:

[0095] 3.1. If V in >V0, that is, the combined concentration of CO and alcohol interference gas in the car shows an upward trend, indicating that the alcohol interference source in the car is persistent, such as someone riding in the car after drinking. At this time, the data directly measured by the sensor minus the alcohol interference amount can be obtained to get V out ,Right now:

[0096] V out =V in -(V0-β)=V in -V0+β Formula (1)

[0097] 3.2 If V in≤V0, that is, the combined concentration of CO and alcohol interference gas in the car shows a downward trend, indicating that the alcohol interference in the car is a single interference, such as the user spraying alcohol disinfection, spraying toilet water (toilet water contains alcohol), etc. After a single interference, the alcohol will naturally settle and the concentration will gradually decrease. Modeling and analysis of this situation shows that the relationship between the amount of alcohol interference in the car and time is (V0-β)·e -kt , V out Can be corrected to:

[0098] V out =V in -(V0-β)·e -kt Formula (2)

[0099] Where:

[0100] k is the parameter set after vehicle calibration;

[0101] t represents the duration of alcohol dissipation, which is V in this embodiment. in ≤The cumulative duration of V0.

[0102] In another embodiment, when V in When V is much smaller than V0, the actual sedimentation process of alcohol in the car is much faster than the natural sedimentation, which will cause the calculation result of formula (2) to become a negative number. In order to avoid this unreasonable situation, V out Can be corrected to:

[0103] V out =max{randbetween(β-Δβ,β+Δβ),V in -(V0-β)·e -kt Formula (3)

[0104] Where:

[0105] Δβ is the allowable initial fluctuation deviation. In this embodiment, Δβ=0.05β

[0106] Preferably, if the switch signal of the door or window is detected during the use of the vehicle, a new alcohol interference factor may be introduced. For example, if a person who drinks alcohol is riding in the vehicle, the door switch information will be detected. Since alcohol cannot accumulate in the vehicle when the door or window is open, it is impossible to determine that there is an alcohol interference source in the vehicle. However, after the door and window are closed, alcohol will accumulate in the vehicle and cause greater interference. Therefore, if the door or window switch signal is detected during the use of the vehicle, it is necessary to re-analyze and judge. At this time, β is re-assigned to V when the door or window is closed. out The value is obtained, and the process returns to step 1 again to calculate the reference concentration V0 of carbon monoxide gas according to the concentration of carbon monoxide gas collected during the time period T+t1 to T+t2. At this time, T is the moment when the door or window is closed.

[0107] Next, determine the real-time concentration of carbon monoxide V out Whether it exceeds the alarm threshold. When the gas concentration value V out When the concentration of carbon monoxide exceeds the alarm threshold, the control module sends an alarm to the vehicle audio and video system; otherwise, the real-time concentration of carbon monoxide continues to be monitored and calculated. The alarm threshold can be set according to actual experience and is not limited in the present invention.

[0108] The vehicle audio and video system receives the alarm information sent by the control module and executes the alarm.

[0109] Preferably, if the user does not want to be alarmed at the current concentration after the alarm, he or she can reset the current carbon monoxide alarm system, stop the alarm and recalculate the benchmark concentration value V0 for the current period of time. At this time, the correction value β is set to 0, and enter step 1 again. At this time, the T time in step 1 is the time when the user performs the reset operation.

[0110] The V0 returned to re-analyze and calculate the reference concentration is based on the current gas concentration in the vehicle. At this time, the V0 value becomes larger, and the downward correction amount also becomes larger, that is, V in -V0 value will become smaller, according to V out =V in -V0+β, so V out will also become smaller, which can reduce the probability of false alarms. Similarly, setting β to 0 will make V out The calculated value is further reduced and is smaller than the original actual concentration value, which is equivalent to raising the alarm threshold and reducing the probability of false alarms.

[0111] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0112] The present application also provides an embodiment of carbon monoxide monitoring and early warning in a vehicle passenger compartment, including a gas concentration acquisition module, a gas reference concentration value calculation module, an alcohol interference determination module and an alarm monitoring module;

[0113] The gas concentration acquisition module is used to obtain data on the current carbon monoxide gas concentration in the vehicle from the sensor;

[0114] The gas reference concentration value calculation module is used to calculate the reference concentration V0 of carbon monoxide gas in the time period T+t1 to T+t2 according to the multiple gas concentration values ​​in the time period T+t1 to T+t2 obtained from the gas concentration acquisition module, where t1 and t2 are the first set time and the second set time respectively; T is the set time;

[0115] When the vehicle is just powered on, T is the time when the vehicle is powered on; after T+t2, when the vehicle detects that the window or door is opened and then closed, T is the time when the vehicle detects that the window or door is opened and then closed; when the user performs a reset operation for carbon monoxide detection, T is the time when the user performs the reset operation;

[0116] The alcohol interference determination module is used to determine the gas concentration value V in the passenger compartment collected after time T+t2. in and set a reference value β to determine whether there is alcohol interference in the car;

[0117] The alarm monitoring module is used to calculate the gas concentration value V out And the alarm threshold is used to alarm when the carbon monoxide in the car passenger compartment exceeds the standard.

[0118] In another embodiment, a gas concentration value correction module is further included, which is used to correct the gas concentration value V measured by the sensor when the alcohol interference determination module determines that alcohol interference exists in the current vehicle. out Make corrections.

[0119] The gas concentration value correction module adjusts the gas concentration value V out Methods for making corrections include:

[0120] If V0>β and V in >V0, then:

[0121] V out =V in -V0+β

[0122] If V0>β and V in ≤V0, then:

[0123] V out =V in -(V0-β)·e -kt

[0124] In another embodiment:

[0125] If V0>β and V in ≤V0, then:

[0126] V out =max{randbetween(β-Δβ,β+Δβ),V in -(V0-β)·e -kt}

[0127] Where:

[0128] k is the calibration parameter;

[0129] t represents the duration of alcohol dissipation. In this embodiment, Vin Cumulative duration ≤V0;

[0130] Δβ is the set allowable initial fluctuation deviation;

[0131] β is the set correction value.

[0132] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A method for monitoring and warning carbon monoxide in a vehicle passenger compartment, characterized in that: The steps include: Step 1, calculating the reference concentration V0 of carbon monoxide gas according to the concentration of carbon monoxide gas collected during the time period T+t1~T+t2; Where t1 and t2 are the first set time and the second set time respectively; T is the setting start time; Step 2: After time T+t2, collect the gas concentration value V in the passenger compartment in , judging whether there is alcohol interference in the car according to the reference concentration V0 and the reference value β; the reference value β is a set value; Step 3: If there is no alcohol interference, the gas concentration value V out is the gas concentration measured by the sensor; if there is alcohol interference, the gas concentration value V in the passenger compartment in , the reference concentration V0 and the reference value β to the gas concentration value V measured by the sensor out make corrections; Step 4: When the gas concentration value V out When it is greater than the alarm threshold, an alarm message is sent that the carbon monoxide in the passenger compartment of the vehicle exceeds the standard; In step 2, the method for setting the reference value β includes: When the vehicle is just powered on and connected to the Internet: β is the carbon monoxide concentration value in the current location air quality data read by the vehicle network; When the vehicle is just powered on but cannot connect to the Internet: β is the carbon monoxide concentration in the vehicle detected by the sensor after the last use of the vehicle for a set period of time; In step 3, if there is alcohol interference, the gas concentration value V out Methods for making corrections include: If V in >V0, then: V out =V in -V0+β.

2. The method for monitoring and early warning carbon monoxide in a vehicle passenger compartment as claimed in claim 1, characterized in that: In step 3, if there is alcohol interference, the gas concentration value V out Methods for making corrections include: If V in ≤V 0， but: V out = V in -(V0 -β)·e -kt Where: k is the calibration parameter; t represents the duration of alcohol dissipation.

3. The method for monitoring and warning carbon monoxide in a vehicle passenger compartment according to claim 1, characterized in that: If alcohol interference exists, the gas concentration value V out Methods for making corrections include: If V in ≤V 0， but: V out =max{randbetween(β-Δβ,β+Δβ), V in -(V0 -β)·e -kt } Where: k is the calibration parameter; t represents the duration of alcohol dissipation; Δβ is the set allowable initial fluctuation deviation; The randbetween(β-Δβ, β+Δβ) indicates generating a random number in the specified range (β-Δβ, β+Δβ).

4. A carbon monoxide monitoring and early warning system for a vehicle passenger compartment using the method of claim 1, characterized in that: It includes a gas concentration acquisition module, a gas baseline concentration value calculation module, an alcohol interference determination module and an alarm monitoring module; The gas concentration acquisition module is used to obtain data on the current carbon monoxide gas concentration in the vehicle from the sensor; The gas reference concentration value calculation module is used to calculate the reference concentration V0 of carbon monoxide gas in the time period T+t1~T+t2 according to the multiple gas concentration values ​​in the time period T+t1~T+t2 obtained from the gas concentration acquisition module, wherein t1 and t2 are the first set time and the second set time respectively; T is the setting time; The alcohol interference determination module is used to determine the gas concentration value V in the passenger compartment collected after time T+t2. in and the reference value β to determine whether there is alcohol interference in the car; The alarm monitoring module is used to calculate the gas concentration value V out and alarm threshold to alarm if carbon monoxide exceeds the limit in the passenger compartment of the vehicle; The gas concentration value correction module is also included, which is used to correct the gas concentration value V measured by the sensor when the alcohol interference determination module determines that there is alcohol interference in the current vehicle. out Make corrections.

5. The vehicle passenger compartment carbon monoxide monitoring and early warning system as claimed in claim 4, characterized in that: The gas concentration value correction module calculates the gas concentration value V out The methods include: If V in ≤V 0， but: V out =V in -(V0 -β)·e -kt Where: k is the calibration parameter; t represents the duration of alcohol dissipation.

6. The carbon monoxide monitoring and early warning system for the passenger compartment of an automobile as claimed in claim 4, characterized in that: The gas concentration value correction module calculates the gas concentration value V out The methods include: If V in ≤V 0， but: V out =max{randbetween(β-Δβ,β+Δβ), V in -(V0 -β)·e -kt } Where: k is the calibration parameter; t represents the duration of alcohol dissipation; Δβ is the set allowable initial fluctuation deviation; The randbetween(β-Δβ, β+Δβ) indicates generating a random number in the specified range (β-Δβ, β+Δβ).

Images