A monitoring data correction system and method for abnormal gas in a vehicle passenger compartment

Abstract

The present invention discloses a monitoring data correction system and method for abnormal gas in a passenger compartment of an automobile, comprising a gas concentration value acquisition module for collecting gas concentration values ​​in the vehicle, a fragrance on / off monitoring module for monitoring whether a fragrance system is turned on, a vehicle state acquisition module for receiving an opening signal of the fragrance system and collecting vehicle state signals related to the correction of abnormal gas concentration values ​​in the vehicle, a correction parameter determination module for determining parameter values ​​related to the correction of abnormal gas concentration values ​​in the vehicle according to vehicle state signals related to the correction of abnormal gas concentration values ​​in the vehicle, and an abnormal gas concentration value output module for calculating and outputting the concentration value of abnormal gas in the vehicle according to the gas concentration value in the vehicle and parameter values ​​related to the correction of abnormal gas concentration values ​​in the vehicle. The present invention corrects the interference caused by the turning on of the fragrance system in the vehicle to the abnormal gas monitoring in the vehicle, and improves the accuracy of the abnormal gas monitoring data in the vehicle.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle detection, and in particular to a monitoring data correction system and method for abnormal gas in a passenger compartment of an automobile. Background Art

[0002] When using gas sensors to track and monitor the content of abnormal gas components such as carbon monoxide (CO), pentanetrialdehyde (VOC), and ethanol (C2H5OH) in the air inside the car in real time, gas components such as fragrance in the car will affect the monitoring results. Therefore, when there is fragrance in the car and the fragrance is turned on, the monitoring data of abnormal gases needs to be corrected. When the vehicle rolls off the production line, the OEM (Original Vehicle Manufacturer) will use special instruments to monitor the odor in the car. Although this special instrument has good resolution, it is expensive, bulky, and has strict requirements on the use environment. Moreover, this type of special instrument cannot monitor the content of abnormal gas components in the car in real time. At present, the gas sensors used for real-time monitoring of abnormal components in the air inside the car on the market are all post-installed products. This post-installed product does not consider the influence of interference factors such as fragrance, nor does it perform special data correction processing for this situation, resulting in a large difference between the monitoring results and the actual situation. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and provide a monitoring data correction system and method for abnormal gas in the passenger compartment of a car, which can correct the abnormal gas composition in the car in real time and make the monitoring data of the abnormal gas composition in the car consistent with the actual situation.

[0004] To achieve this purpose, the monitoring data correction system for abnormal gas in the passenger compartment of an automobile designed by the present invention is characterized in that it includes a gas concentration value acquisition module, a fragrance opening and closing monitoring module, a vehicle status acquisition module, a correction parameter determination module and an abnormal gas concentration value output module;

[0005] The gas concentration value acquisition module is used to collect the gas concentration value in the vehicle;

[0006] The fragrance on / off monitoring module is used to monitor whether the fragrance system (the fragrance system here is the vehicle-mounted fragrance system that comes with the vehicle, which is a component of the vehicle hardware, and only needs to monitor the on signal sent after the system is turned on) is turned on;

[0007] The vehicle status acquisition module is used to receive the start-up signal of the fragrance system and acquire the vehicle status signal related to the correction of the abnormal gas concentration value in the vehicle;

[0008] The correction parameter determination module is used to determine the parameter value related to the correction of the abnormal gas concentration value in the vehicle according to the vehicle state signal related to the correction of the abnormal gas concentration value in the vehicle;

[0009] The abnormal gas concentration value output module is used to calculate and output the actual concentration value of the abnormal gas in the vehicle according to the in-vehicle gas concentration value and the parameter value related to correcting the in-vehicle abnormal gas concentration value.

[0010] Furthermore, the collecting and correcting of the vehicle status signal related to the abnormal gas concentration value in the vehicle includes collecting the opening gear signal of the fragrance system, the window opening signal and the vehicle driving speed signal.

[0011] Further, the correction parameter determination module determines the parameter value related to the correction of the abnormal gas concentration value in the vehicle according to the vehicle state signal related to the correction of the abnormal gas concentration value in the vehicle, including determining the correction parameter V according to the opening gear signal of the fragrance system; determining the correction parameter K according to the window opening and the vehicle speed; determining the initial calculated concentration value c of the fragrance according to the correction parameter V and the correction parameter K. 0 .

[0012] Furthermore, the method for determining the correction parameter V according to the opening gear signal of the fragrance system is: drawing and pre-storing a corresponding relationship chart of the fragrance concentration value and the gas sensor response value, drawing and pre-storing a chart of the correction parameter V and the fragrance opening gear according to the corresponding relationship chart of the fragrance concentration value and the gas sensor response value, obtaining the corresponding correction parameter V by looking up the table according to the collected opening gear of the fragrance system, or measuring the fragrance concentration value by a special sensor for measuring the fragrance concentration value, drawing and pre-storing a chart of the correction parameter V and the fragrance opening gear according to the corresponding relationship between the fragrance concentration value and the special sensor response value, and obtaining the corresponding correction parameter V by looking up the table according to the collected opening gear of the fragrance system.

[0013] Furthermore, the method for drawing a corresponding relationship chart between fragrance concentration values ​​and gas sensor response values ​​is: placing a vehicle-mounted fragrance generator, a micro fan and a gas sensor in a test cabin with a volume of L liters, turning on the vehicle-mounted fragrance generator and the micro fan, both of which are adjusted to the maximum gear, observing the gas sensor reading, and when the gas sensor reading is stable, taking the gas sensor reading at this time as the saturated concentration value of the fragrance; turning off the vehicle-mounted fragrance generator, extracting L / n liters of gas from the test cabin, and simultaneously replenishing L / n liters of clean air to the test cabin, reading and recording the gas sensor reading at this time; repeating the above steps, each time the above steps are repeated, the gas extracted from the test cabin at a time increases by L / n liters, until the volume of gas extracted from the test cabin at a single time is the same as the volume of the test cabin; converting the fragrance concentration value in the test cabin after each air extraction into a dimensionless number, and making a corresponding relationship chart between the fragrance concentration value and the gas sensor response value with a one-to-one correspondence with the gas sensor reading;

[0014] The method for drawing a graph of the correction parameter V and the fragrance opening gear position is: placing the vehicle in an open space, opening the doors and windows for sufficient ventilation, closing the doors and windows, turning on the fragrance system, adjusting it to the first gear position, so that the fragrance concentration value in the vehicle increases, and recording the response data of the gas sensor at different times; checking the fragrance concentration value at different times through the response data of the gas sensor and the corresponding relationship chart of the fragrance concentration value and the gas sensor response value; taking the first n groups of valid data, and using the least squares method to calculate the slope of the fragrance concentration value changing with time, and this slope is the V value corresponding to the fragrance system when it is in the first gear position; traversing all gears of the fragrance system, repeating the above steps to obtain the V values ​​corresponding to all the opening gears of the fragrance system, and making a graph of the correction parameter V and the fragrance opening gear position by making a one-to-one correspondence between all the opening gears of the fragrance system and the V values.

[0015] Furthermore, the method for determining the correction parameter K according to the window opening and the vehicle speed is: according to the corresponding relationship chart of the fragrance concentration value and the gas sensor response value and the chart of the correction parameter V and the fragrance opening gear, a chart of the relationship between the correction parameter K and the window opening and the vehicle speed is drawn and pre-stored, and the corresponding correction parameter K is obtained by looking up the table according to the collected window opening and vehicle speed.

[0016] Furthermore, the method for drawing a graph of the relationship between the correction parameter K and the window opening and the vehicle driving speed is: the vehicle is stationary, the doors and windows are closed, the fragrance system is turned on and adjusted to any gear, the windows are opened to any set opening, the vehicle is driven at a constant speed at any set speed, and after the gas sensor data is stable, the current window opening, the vehicle driving speed and the response value of the gas sensor are recorded, and the current fragrance concentration value is determined through a corresponding relationship graph between the current response value of the gas sensor and the fragrance concentration value and the gas sensor response value, and the V value corresponding to the current opening gear of the fragrance system is determined through the current opening gear of the fragrance system and the graph of the correction parameter V and the fragrance opening gear, and the K value under the current window opening and vehicle driving speed is calculated through the current fragrance concentration value and the V value corresponding to the current opening gear of the fragrance system, the window opening and vehicle driving speed are changed, and the above steps are repeated to make a graph of the relationship between the correction parameter K and the window opening and vehicle driving speed with different window openings, vehicle driving speeds and the K values ​​corresponding to each other.

[0017] Further, the initial calculated concentration value c of the fragrance is determined according to the correction parameter V and the correction parameter K. 0 The method is: if the vehicle status acquisition module receives the fragrance system start signal for the first time within a single power-on cycle, then the current moment c 0=0; the correction parameter V, the correction parameter K and c 0 = 0 is substituted into the calculation formula of the in-car fragrance concentration value to calculate the in-car fragrance concentration value at the current moment. When any of the correction parameters V and K changes, the in-car fragrance concentration value at the moment before the correction parameters V and K change is used as c 0 The value of .

[0018] Furthermore, the abnormal gas concentration value output module calculates and outputs the concentration value of the abnormal gas in the vehicle according to the in-vehicle gas concentration value and the parameter value related to the correction of the in-vehicle abnormal gas concentration value by: the correction parameter V of the opening gear signal of the fragrance system, the correction parameter K of the window opening and the vehicle speed, and the initial calculated concentration value c of the fragrance 0 The calculation formula of the fragrance concentration value in the car is input to calculate the current fragrance concentration value in the car, and the concentration value of the abnormal gas in the car after correction is obtained by subtracting the current fragrance concentration value in the car from the gas concentration value in the car. The corrected concentration value of the abnormal gas in the car is output as the actual concentration value of the abnormal gas in the car.

[0019] Furthermore, a correction method based on the above-mentioned vehicle passenger compartment abnormal gas monitoring data correction system comprises the following steps:

[0020] Step 1: Collect the gas concentration value in the car;

[0021] Step 2: Monitor whether the fragrance system is turned on;

[0022] Step 3: If the fragrance system is turned on, the vehicle status signal related to the correction of the abnormal gas concentration value in the vehicle is collected; if the fragrance system is not turned on, the currently collected gas concentration value in the vehicle is output as the actual concentration value of the abnormal gas in the vehicle;

[0023] Step 4: determining a parameter value related to correcting the abnormal gas concentration value in the vehicle according to a vehicle state signal related to correcting the abnormal gas concentration value in the vehicle;

[0024] Step 5: Calculate and output the concentration value of the abnormal gas in the vehicle according to the concentration value of the gas in the vehicle and the parameter value related to correcting the concentration value of the abnormal gas in the vehicle.

[0025] The beneficial effects of the present invention are as follows: the monitoring data correction system for abnormal gas in the passenger compartment of an automobile designed by the present invention can accurately estimate the concentration value of the fragrance in the car and its changing trend, and determine the interference amount of the fragrance according to the fragrance concentration value, the table lookup method and the calculation formula of the fragrance concentration value. By subtracting the fragrance concentration value from the monitored gas concentration value in the car, the interference caused by the activation of the fragrance system in the car to the abnormal gas monitoring in the car can be corrected, and an accurate abnormal gas concentration value in the car is output, thereby ensuring the accuracy of the abnormal gas monitoring data in the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of module connections of the monitoring data correction system for abnormal gas in the passenger compartment of an automobile in the present invention;

[0027] Figure 2 It is a flow chart of the method for correcting abnormal gas monitoring data in the passenger compartment of an automobile in the present invention;

[0028] Figure 3 It is a schematic diagram of a corresponding relationship chart of fragrance concentration value and gas sensor response value in the present invention;

[0029] Figure 4 It is a schematic diagram of a chart of the correction parameter V and the fragrance opening gear in the present invention;

[0030] Figure 5 is a schematic diagram of a graph showing the relationship between the correction parameter K, the window opening and the vehicle speed in the present invention;

[0031] Figure 6 A schematic diagram of a test chamber for establishing a corresponding relationship between a fragrance concentration value and a sensor response value in the present invention;

[0032] Among them, 1 is a gas concentration value acquisition module, 2 is a fragrance opening and closing monitoring module, 3 is a vehicle status acquisition module, 4 is a correction parameter determination module, 5 is an abnormal gas concentration value output module, 6 is a test chamber, 7 is a vehicle-mounted fragrance generator, 8 is a micro fan, 9 is a gas sensor, 10 is an air inlet, 11 is an air outlet, 12 is a host computer, and 13 is a power supply. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1—2 shows a monitoring data correction system for abnormal gas in a passenger compartment of a car, comprising a gas concentration value acquisition module 1 for acquiring gas concentration values ​​in the car, a fragrance on-off monitoring module 2 for monitoring whether a fragrance system is turned on, a vehicle status acquisition module 3 for receiving an on signal of the fragrance system and acquiring a vehicle status signal related to the correction of abnormal gas concentration values ​​in the car, a correction parameter determination module 4 for determining a parameter value related to the correction of abnormal gas concentration values ​​in the car according to the vehicle status signal related to the correction of abnormal gas concentration values ​​in the car, and an abnormal gas concentration value output module 5 for calculating and outputting the actual concentration value of abnormal gas in the car according to the gas concentration value in the car and the parameter value related to the correction of abnormal gas concentration values ​​in the car.

[0035] Specifically, collecting vehicle status signals related to the correction of abnormal gas concentration values ​​in the vehicle includes collecting the opening gear position signal of the fragrance system, the window opening signal and the vehicle driving speed signal. The correction parameter determination module 4 determines the parameter value related to the correction of abnormal gas concentration values ​​in the vehicle according to the vehicle status signals related to the correction of abnormal gas concentration values ​​in the vehicle, including determining the correction parameter V according to the opening gear position signal of the fragrance system or measuring the fragrance concentration value by a special sensor for measuring the fragrance concentration value, drawing and pre-storing a chart of the correction parameter V and the fragrance opening gear position according to the corresponding relationship between the fragrance concentration value and the special sensor response value, and obtaining the corresponding correction parameter V by looking up the table according to the collected opening gear position of the fragrance system; determining the correction parameter K according to the window opening and the vehicle driving speed; and determining the initial calculated concentration value c of the fragrance according to the correction parameter V and the correction parameter K. 0 .

[0036] The method for determining the correction parameter V according to the opening gear signal of the fragrance system is: draw and pre-store a corresponding relationship chart between the fragrance concentration value and the gas sensor response value (such as Figure 3 As shown), according to the corresponding relationship chart between the fragrance concentration value and the gas sensor response value, a chart of the correction parameter V and the fragrance opening gear is drawn and pre-stored (as shown in Figure 4 As shown), the corresponding correction parameter V is obtained by looking up the table according to the collected opening gear position of the fragrance system.

[0037] The method for determining the correction parameter K according to the window opening and the vehicle speed is as follows: according to the corresponding relationship chart between the fragrance concentration value and the gas sensor response value (such as Figure 3 ) and a chart of the correction parameter V and the fragrance opening position (as shown in Figure 4 ), draw and pre-store a graph of the relationship between the correction parameter K and the window opening and the vehicle speed (as shown in Figure 5 As shown), the corresponding correction parameter K is obtained by looking up the table according to the collected window opening and vehicle speed.

[0038] The abnormal gas concentration value output module 5 calculates and outputs the concentration value of the abnormal gas in the vehicle according to the gas concentration value in the vehicle and the parameter value related to the correction of the abnormal gas concentration value in the vehicle: the correction parameter V of the opening gear signal of the fragrance system, the correction parameter K of the window opening and the vehicle speed and the initial calculated concentration value c of the fragrance are converted into the correction parameter V of the opening gear signal of the fragrance system, the correction parameter K of the window opening and the vehicle speed and the initial calculated concentration value c of the fragrance. 0 Substitute the calculation formula for the fragrance concentration value in the car into the calculation to obtain the current fragrance concentration value in the car, subtract the current fragrance concentration value in the car from the gas concentration value in the car to obtain the corrected concentration value of the abnormal gas in the car, and output the corrected concentration value of the abnormal gas in the car as the current concentration value of the abnormal gas in the car.

[0039] The monitoring data correction method of abnormal gas in the automobile passenger compartment of the present invention is:

[0040] Step 1: Collect the gas concentration value in the car;

[0041] Step 2: Monitor whether the fragrance system is turned on;

[0042] Step 3: If the fragrance system is turned on, the vehicle status signal related to the correction of the abnormal gas concentration value in the vehicle is collected; if the fragrance system is not turned on, the currently collected gas concentration value in the vehicle is output as the actual concentration value of the abnormal gas in the vehicle;

[0043] Step 4: determining a parameter value related to correcting the abnormal gas concentration value in the vehicle according to a vehicle state signal related to correcting the abnormal gas concentration value in the vehicle;

[0044] Step 5: Calculate and output the actual concentration value of the abnormal gas in the vehicle according to the gas concentration value in the vehicle and the parameter value related to correcting the abnormal gas concentration value in the vehicle.

[0045] Specifically, first, a corresponding relationship chart between the fragrance concentration value and the gas sensor response value is established in advance (such as Figure 3 ), a chart of the correction parameter V and the fragrance opening position (as shown in Figure 4 ), a diagram showing the relationship between the correction parameter K and the window opening and the vehicle speed (as shown in Figure 5 and write it into the control module.

[0046] The method for establishing the corresponding relationship chart between fragrance concentration value and gas sensor response value is: pre-measure and record the gas sensor response values ​​caused by fragrances of different concentration values, and fit the two to obtain the relationship chart between fragrance concentration value and gas sensor response value. The specific method is: Figure 6As shown, in step 1, a vehicle-mounted fragrance generator 7 and a gas sensor 9 are placed in a clean test chamber 6 (for example, a transparent plastic box with a volume of 50L, in which a micro fan is installed) (the distance between the two should not be too close, and the outlet of the vehicle-mounted fragrance generator 7 should be facing away from the gas sensor 9), the vehicle-mounted fragrance generator 7 is connected to the power supply 13, and the gas sensor 9 is connected to the host computer 12. The vehicle-mounted fragrance generator 7 and the micro fan 8 are turned on and adjusted to the maximum gear, and the reading of the gas sensor 9 is observed through the host computer 12. When the fluctuation of the gas sensor 9 reading is less than 0.5% within 60 seconds, it is considered that the fragrance concentration is saturated and the fragrance influence has reached the maximum value. The arithmetic mean of the gas sensor 9 readings within 60 seconds is calculated and recorded. Step 2, after turning off the vehicle-mounted fragrance generator 7, 1L of gas is extracted from one end of the test chamber 6, and 1L of clean air is added to the other end of the test chamber 6 simultaneously, and the gas sensor 9 value at this time is read and recorded. Step 3, repeat steps 1 and 2, but change the 1L gas extracted in step 2 to 2L gas, and each time step 1 and step 2 are repeated, the gas extracted must increase by 1L, until it is repeated 50 times. Step 4, assume that the fragrance saturation concentration value is a dimensionless number 1, and calculate the fragrance concentration value cn in the test chamber 6 after each gas extraction as 1-n / 50 (this calculation formula is based on the effective volume of the test chamber of 50L, that is, the volume of gas that can be accommodated is 50L, and the gas extraction volume is 1L, 2L, 3L...50L), where n is the gas extraction volume. Step 5, fill the result of step 4 into the attached Figure 3 Fill the gas sensor readings recorded in steps 2 and 3 in the left column of the table, and fill in the gas sensor readings recorded in steps 2 and 3 in the right column of the table to form a corresponding relationship table. Since it takes time to pump out gas and read the readings, and the fragrance itself has a natural sedimentation process, it is necessary to take a reading every time you pump out gas, saturate it after reading, and then pump out gas and read it again after saturation to reduce the cumulative error. You cannot pump out 1L to read the number once, and then pump out 1L to read the number again. This method has too much error.

[0047] The V value depends on the gear position of the fragrance. The correspondence between the V value and the fragrance gear position is determined by calibration. The V value calibration method is as follows: Step 1, park the vehicle in an open area, open the doors and windows for sufficient ventilation. Then close the doors and windows, turn on the fragrance system, adjust it to the first gear, let the fragrance concentration value in the car increase, and record the response data of the gas sensor at different times. Step 2, use the gas sensor response data to obtain the correspondence between the fragrance concentration value and the gas sensor response value (i.e. Figure 3) Check the fragrance concentration values ​​at different times. Step 3, take the first n (for convenience of calculation n = 50) groups of valid data (the word "valid" is added here because after the fragrance system is turned on, the data changes of the gas sensor are not obvious at the beginning, and the data of the gas sensor will increase significantly after a period of time. The data before the data output by the gas sensor increases significantly cannot be used to calculate the V value, so it is an invalid value. In actual engineering, it may not be possible to accurately define obvious increases and insignificant increases. A more practical method is: starting from the first group of valid data, take 50 groups of data and calculate the slope using the least squares method. Then starting from the second group of data, take another 50 groups of data to calculate the slope. After repeated calculations, many slope values ​​will be obtained. Take the largest slope value as the V value corresponding to this gear. That is, the slope of the fragrance concentration value changing with time is calculated using the least squares method. This slope is the V value corresponding to the first gear of the fragrance. Step 4, change and traverse all gears of the fragrance, and repeat steps 1-3. Step 5, fill in the different gear data and the corresponding V value data respectively. Figure 4 The left and right columns in the table can form a corresponding relationship chart between the V value and the fragrance level. ) is the "fragrance concentration value at different times", which includes two parameter values, time and concentration value. One time point corresponds to one fragrance concentration value, and these two data are a set of data.

[0048] The K value depends on the window opening and the vehicle's speed. The correspondence between the K value, the window opening and the vehicle's speed is determined by calibration. K value calibration method: Step 1. The vehicle is stationary, the doors and windows are closed, the fragrance is turned on and adjusted to a certain gear (preferably the highest gear). Step 2. Keep the fragrance gear unchanged, open the window with a certain gap, and let the vehicle travel at a certain speed. After the gas sensor data is stable, record the window opening (window gap height), vehicle speed, and gas sensor response value. Step 3. Use the gas sensor response value to pass Figure 3 Look up the corresponding fragrance concentration value, recorded as c; through Figure 4 Reverse check the V value corresponding to this fragrance gear. Step 4, calculate the K value corresponding to this window opening and speed (K = V / c). Step 5, change the window opening and speed, and repeat steps 1-3. Step 6, fill in different window openings (window gap heights) and speeds respectively. Figure 5 The first column and the first row of Figure 5 For other areas, a graph showing the corresponding relationship between the K value, the window opening and the vehicle speed can be formed.

[0049] After the vehicle is powered on, the gas sensor collects real-time data on the gas concentration in the vehicle and monitors whether there is a fragrance activation signal.

[0050] If there is no fragrance on signal during the vehicle's current power-on cycle, the concentration value data measured by the gas sensor does not need to be corrected and can be directly used as the actual concentration value of the corresponding abnormal gas.

[0051] If there is a fragrance opening signal, the control module further retrieves the window and vehicle speed signals and checks the K value (through Figure 5 The K value is determined by the corresponding relationship chart between K value, window opening and vehicle speed), and the V value is checked (through Figure 4 The V value is determined by the corresponding relationship chart between the V value and the fragrance level. Let c 0 =0, according to the calculation formula of the fragrance concentration value in the car Calculate the fragrance concentration value in the car.

[0052] Where c t represents the current fragrance concentration value, K and V are correction parameters, c 0 is the calculation of the initial concentration value; e is the base of the natural logarithm, which is 2.718; t represents time. 0 The method for determining t is: if the fragrance is turned on for the first time during this power-on cycle, then c 0 =0, t starts from 0; when the window opening, vehicle speed, or fragrance gear position changes and causes a change in K or V value, the c at the last moment before the K or V value changes is recorded. t value and assign this value to c 0 , and t starts again from 0.

[0053] To facilitate understanding of the technical solution of the present invention, the establishment process of the calculation model formula of the in-car fragrance concentration value is attached. After the in-car fragrance system is turned on, when the fragrance gear is certain, the fragrance system will release fragrance components into the car at a certain rate V. The value of V is only related to the gear of the fragrance system. On the other hand, since the vehicle is not a completely closed system, the fragrance in the car will diffuse outward through the breathing holes of the car body, the gaps in the windows, etc., and the diffusion rate is related to the in-car fragrance concentration value c. t The proportional coefficient of this proportional relationship is parameter K. The value of K mainly depends on the window opening and the vehicle speed. Therefore, the rate of change of the fragrance concentration in the car is VK·c t

[0054] Right now

[0055]

[0056] Solving the above differential equation gives c t The relationship between the value and time t.

[0057] Let x = VK·c t , differentiate both sides and get dx = -K·dc t,but

[0058]

[0059]

[0060]

[0061] By integrating both sides, we can get

[0062] lnx=-Kt+A

[0063] x=exp(-Kt+λ)

[0064] VK·c t =exp(-Kt+λ)

[0065] Substituting the boundary conditions into

[0066]

[0067] Since the V value is only related to the gear of the fragrance system, when the gear of the fragrance is fixed, the V value is also fixed. After turning on the fragrance at this fragrance gear, as the fragrance concentration value c in the car increases, t Gradually increases, the change rate of the fragrance concentration in the car VK·c t Will gradually decrease until VK·c t = 0, the car fragrance concentration value reaches a stable value. Therefore, when the car fragrance is stable, V = k·c t , that is, K = V / c t This formula can be used in the calibration calculation process of K value.

[0068] Check the corresponding relationship chart between the fragrance concentration value and the gas sensor response value to calculate the fragrance equivalent abnormal gas concentration value. This equivalent abnormal gas concentration value is essentially the interference caused by the fragrance in the car to the gas sensor measurement. Therefore, the actual concentration value of the abnormal gas is obtained by subtracting the fragrance equivalent abnormal gas concentration value from the gas sensor collection value. When the fragrance gear changes, return to redetermine the V value through the table lookup method. Similarly, when the vehicle speed and window opening change, return to redetermine the K value through the table lookup method. When any of the values ​​of V and K changes, record the c before the change occurs. t value, and iteratively assign this value to c 0 , and the t value returns to zero and starts timing again.

[0069] The automobile passenger compartment abnormal gas monitoring data correction system designed by the present invention can accurately estimate the fragrance concentration value and its changing trend in the car, and determine the interference amount of the fragrance according to the fragrance concentration value, the table lookup method and the calculation formula of the fragrance concentration value. By subtracting the fragrance concentration value from the monitored gas concentration value in the car, the interference caused by the activation of the car fragrance system to the abnormal gas monitoring in the car can be corrected, and the accurate actual concentration value of the abnormal gas in the car is output, thereby ensuring the accuracy of the abnormal gas monitoring data in the car.

[0070] The above are only preferred embodiments of the present invention, and do not limit the structure of the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A monitoring data correction system for abnormal gas in a car passenger compartment, characterized in that: It comprises a gas concentration value acquisition module (1), a fragrance opening and closing monitoring module (2), a vehicle status acquisition module (3), a correction parameter determination module (4) and an abnormal gas concentration value output module (5); The gas concentration value acquisition module (1) is used to acquire the gas concentration value in the vehicle; The fragrance on / off monitoring module (2) is used to monitor whether the fragrance system is on; The vehicle status acquisition module (3) is used to receive the start-up signal of the fragrance system and to acquire vehicle status signals related to the correction of the abnormal gas concentration value in the vehicle, including acquiring the start-up gear position signal of the fragrance system, the window opening signal and the vehicle driving speed signal; The correction parameter determination module (4) is used to determine a parameter value related to the correction of the abnormal gas concentration value in the vehicle according to a vehicle state signal related to the correction of the abnormal gas concentration value in the vehicle, and includes determining a correction parameter V according to an opening gear position signal of the fragrance system; Determine a correction parameter K according to the window opening and the vehicle speed; The initial calculated concentration value C0 of the fragrance is determined according to the correction parameter V and the correction parameter K; the method for determining the correction parameter V according to the opening gear signal of the fragrance system is: drawing and pre-storing a corresponding relationship chart of the fragrance concentration value and the gas sensor response value, drawing and pre-storing a chart of the correction parameter V and the fragrance opening gear according to the corresponding relationship chart of the fragrance concentration value and the gas sensor response value, obtaining the corresponding correction parameter V according to the table of the opening gear of the collected fragrance system, or measuring the fragrance concentration value by a special sensor for measuring the fragrance concentration value, and drawing and pre-storing the correction parameter V and the fragrance opening gear according to the corresponding relationship between the fragrance concentration value and the special sensor response value. A chart is drawn, and a corresponding correction parameter V is obtained by looking up the table according to the collected opening gear position of the fragrance system; the method for drawing a corresponding relationship chart between the fragrance concentration value and the gas sensor response value is as follows: placing a vehicle-mounted fragrance generator (7), a micro fan (8) and a gas sensor (9) in a test chamber (6) with a volume of L liters, turning on the vehicle-mounted fragrance generator (7) and the micro fan (8), both of which are adjusted to the maximum gear position, observing the reading of the gas sensor (9), and when the reading of the gas sensor (9) is stable, the reading of the gas sensor (9) at this time is used as the saturation concentration value of the fragrance; turning off the vehicle-mounted fragrance generator (7), extracting L / n liters of gas from the test chamber (6), and simultaneously injecting L / n liters of gas into the test chamber (6) Simultaneously replenish L / n liters of clean air, read and record the gas sensor (9) reading at this time; repeat the above steps, each time the above steps are repeated, the gas extracted from the test chamber (6) increases by L / n liters, until the volume of the gas extracted from the test chamber (6) is the same as the volume of the test chamber (6); the fragrance concentration value in the test chamber (6) after each extraction is dimensionlessly digitized, and a corresponding relationship chart between the fragrance concentration value and the gas sensor response value is prepared in a one-to-one correspondence with the gas sensor (9) reading; the method of drawing a chart of the correction parameter V and the fragrance opening gear is as follows: place the vehicle in an open space, open the doors and windows for full ventilation, close the doors and windows, turn on the fragrance system The system is adjusted to the first gear to increase the fragrance concentration value in the car, and the response data of the gas sensor at different times are recorded; the fragrance concentration values ​​at different times are checked through the response data of the gas sensor and the corresponding relationship chart of the fragrance concentration value and the gas sensor response value; the first n groups of valid data are taken, and the slope of the fragrance concentration value changing with time is calculated by the least square method, and this slope is the V value corresponding to the fragrance system when it is in the first gear; all gears of the fragrance system are traversed, and the above steps are repeated to obtain the V values ​​corresponding to all the open gears of the fragrance system, and all the open gears of the fragrance system and the V values ​​are corresponded one by one to prepare a chart of the correction parameter V and the fragrance open gear;The method for determining the correction parameter K according to the window opening and the vehicle speed is: according to the corresponding relationship chart of the fragrance concentration value and the gas sensor response value and the chart of the correction parameter V and the fragrance opening gear, a chart of the relationship between the correction parameter K and the window opening and the vehicle speed is drawn and pre-stored, and the corresponding correction parameter K is obtained by looking up the table according to the collected window opening and vehicle speed; The method for drawing a graph of the relationship between the correction parameter K and the window opening and the vehicle driving speed is: the vehicle is stationary, the doors and windows are closed, the fragrance system is turned on and adjusted to any gear, the windows are opened to any set opening, the vehicle is driven at a constant speed at any set speed, and after the gas sensor data is stable, the current window opening, the vehicle driving speed and the response value of the gas sensor are recorded, the current fragrance concentration value is determined by a corresponding relationship graph between the current response value of the gas sensor and the fragrance concentration value and the gas sensor response value, the V value corresponding to the current opening gear of the fragrance system is determined by the current opening gear of the fragrance system and the graph of the correction parameter V and the fragrance opening gear, the K value under the current window opening and vehicle driving speed is calculated by the current fragrance concentration value and the V value corresponding to the current opening gear of the fragrance system, the window opening and vehicle driving speed are changed, and the above steps are repeated to form a graph of the relationship between the correction parameter K and the window opening and vehicle driving speed with different window openings, vehicle driving speeds and the K values ​​corresponding to each other; The method for determining the initial calculated concentration value C0 of the fragrance according to the correction parameter V and the correction parameter K is as follows: if the vehicle state acquisition module (3) receives the fragrance system start signal for the first time within a single power-on cycle, then C0=0 at the current moment; the correction parameter V, the correction parameter K and C0=0 are substituted into the calculation formula of the fragrance concentration value in the vehicle: Calculate the current in-car fragrance concentration value in the formula C t represents the fragrance concentration value at the current moment, K and V are correction parameters, and C0 is the calculated initial concentration value; e is the base of the natural logarithm, which is 2.718; t represents time, and when any of the correction parameters V and K changes, the fragrance concentration value in the car at the moment before the correction parameters V and K change is taken as the value of C0; The abnormal gas concentration value output module (5) is used to calculate and output the actual concentration value of the abnormal gas in the vehicle according to the in-vehicle gas concentration value and a parameter value related to correcting the in-vehicle abnormal gas concentration value.

2. The monitoring data correction system for abnormal gas in the passenger compartment of an automobile as claimed in claim 1, characterized in that: The method by which the abnormal gas concentration value output module (5) calculates and outputs the concentration value of the abnormal gas in the vehicle according to the gas concentration value in the vehicle and the parameter value related to the correction of the abnormal gas concentration value in the vehicle is as follows: the correction parameter V of the opening gear signal of the fragrance system, the correction parameter K of the window opening and the vehicle driving speed, and the initial calculated concentration value C0 of the fragrance are substituted into the calculation formula of the fragrance concentration value in the vehicle to calculate the current fragrance concentration value in the vehicle, the current fragrance concentration value in the vehicle is subtracted from the gas concentration value in the vehicle to obtain the corrected concentration value of the abnormal gas in the vehicle, and the corrected concentration value of the abnormal gas in the vehicle is output as the actual concentration value of the abnormal gas in the vehicle.

3. A correction method based on the monitoring data correction system of abnormal gas in the passenger compartment of an automobile according to claim 1 or 2, characterized in that: It includes the following steps: Step 1: Collect the gas concentration value in the car; Step 2: Monitor whether the fragrance system is turned on; Step 3: If the fragrance system is turned on, the vehicle status signal related to the correction of the abnormal gas concentration value in the vehicle is collected; if the fragrance system is not turned on, the currently collected gas concentration value in the vehicle is output as the actual concentration value of the abnormal gas in the vehicle; Step 4: determining a parameter value related to correcting the abnormal gas concentration value in the vehicle according to a vehicle state signal related to correcting the abnormal gas concentration value in the vehicle; Step 5: Calculate and output the concentration value of the abnormal gas in the vehicle according to the concentration value of the gas in the vehicle and the parameter value related to correcting the concentration value of the abnormal gas in the vehicle.

Images