Method, device, equipment and medium for measuring air purification efficiency of vehicle passenger cabin

Abstract

The application relates to a vehicle passenger cabin air purification efficiency measurement method, device, equipment and medium, comprising the following steps: when the vehicle meets air conditioning conditions, first ambient air temperature and humidity conditions and vehicle wheel end load conditions, the cooling liquid of the vehicle is controlled to be reduced to a preset temperature, the vehicle is controlled to run based on a first target pollutant concentration value and an air conditioner internal circulation strategy, and a first pollutant value in the passenger cabin and a second pollutant value outside the passenger cabin are measured; when the vehicle meets the air conditioning conditions, second ambient air temperature and humidity conditions and vehicle wheel end load conditions, the engine is controlled to run at a constant speed for a preset time length, after the engine stops running, the vehicle is controlled to run based on a second target pollutant concentration value and an air conditioner running strategy, and a third pollutant value in the passenger cabin and a fourth pollutant value outside the passenger cabin are measured; and a comprehensive purification efficiency value of the passenger cabin is obtained according to the first pollutant value and the second pollutant value, the third pollutant value and the fourth pollutant value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle air purification, and in particular to a method and device for measuring air purification efficiency of a vehicle passenger cabin, equipment and a medium. BACKGROUND

[0002] In some regions of China, moderate and heavy pollution weather occurs from time to time. When a vehicle is running, pollutants in the environment outside the vehicle can enter the passenger cabin through the gaps in the passenger cabin or through the ventilation opportunity. To address this problem and provide clean air for the people in the passenger cabin, the air-tightness of the vehicle is enhanced and the air conditioning system is provided with an air filter component, so that the concentration of pollutants in the vehicle is lower than that of the environment outside the vehicle, such as PM2.5, NOx, etc. Under the same environmental conditions, the vehicle with a relatively more airtight passenger cabin and a relatively more efficient air filtration system can have less PM2.5 pollutants in the passenger cabin. The current standards for testing and evaluating the purification efficiency of pollutants in a local space are all aimed at the component level. For example, the air conditioner filter can be tested and evaluated for its efficiency in purifying particulate matter and harmful gases based on different test standards, while there is a lack of an industry-recognized test method for the air purification efficiency of the passenger cabin of the whole vehicle.

[0003] In the application of evaluating the air purification efficiency of the passenger cabin of a light vehicle, in order to more accurately reproduce the vehicle running state and facilitate the operation of the test process, it is expected to have a test method in which a complete vehicle is taken as the measured object, the composition of pollutants in the surrounding environment is controlled, the values of air pollutants in the surrounding environment and the values of purified air pollutants in the passenger cabin can be directly measured, and the purification efficiency value can be obtained.

[0004] A method for improving the air purification efficiency in a vehicle based on a double-channel PM2.5 sensor is proposed in the related art. The method detects the PM2.5 concentration values inside and outside the vehicle in real time and transmits the signals to the vehicle air conditioner controller. The controller automatically controls the mode switching of the internal and external circulation switching unit and automatically controls the control method of the air volume position, so as to prevent high-concentration PM2.5 dust outside the vehicle from entering the vehicle and ensure that clean air outside the vehicle enters the vehicle for fresh air exchange, thereby efficiently reducing the PM2.5 dust concentration in the vehicle and protecting the user's respiratory health. The purpose and function of this patent are to achieve low PM2.5 dust concentration in the vehicle.

[0005] A control method of an automobile passenger cabin air cleanliness control system is also proposed in the related art. The method controls the air conditioner based on an oxygen increasing forced switch, a negative ion generator forced switch, a vehicle window in place detection switch, an oxygen sensor, a negative ion concentration sensor, a particulate matter concentration sensor, and a heater core signal, thereby improving the cleanliness of the passenger cabin. The purpose and function of this patent are to optimize the three indicators of oxygen volume fraction, negative ion concentration, and particulate concentration.

[0006] However, the two aforementioned patents are not methods for evaluating the efficiency of a vehicle air conditioning system in purifying the air in the passenger compartment, and cannot directly reflect the ability of the vehicle to reduce harmful pollutants in the passenger compartment. The "Method for Testing the Filtration of Particulate Matter (PM) in a Vehicle" in the group standard specifies a method for testing the ability of the air conditioner to filter particulate matter in the air in the vehicle, but this method has two shortcomings. First, only the engine idle condition is selected, which cannot properly represent the actual driving of the vehicle due to the active management of the air flow of the air conditioner. Second, the particulate matter concentration in the environment outside the vehicle is no longer controlled by the test device during the measurement phase, which causes the PM value of the environment in which the vehicle is located to drop and the degree of drop to be out of control. The above two aspects cause the test process for purifying the passenger compartment to deviate from the actual driving conditions of the vehicle. Therefore, it is necessary to take measures to overcome the shortcomings of the prior art and measure the air purification efficiency of the passenger compartment of the vehicle. SUMMARY

[0007] The present application provides a method, device, equipment and medium for measuring the air purification efficiency of the passenger compartment of a vehicle to solve the problem of low accuracy in the prior art.

[0008] The first aspect of the present application provides a method for measuring the air purification efficiency of the passenger compartment of a vehicle, comprising the following steps: when the vehicle meets the preset air conditioning setting conditions, the first ambient air temperature and humidity conditions, and the vehicle wheel end load conditions, controlling the cooling liquid of the vehicle to be lowered to a preset temperature based on a preset vehicle soaking strategy, and controlling the vehicle to run based on a first target pollutant concentration value and a preset air conditioning internal circulation strategy, measuring the first pollutant value in the passenger compartment of the vehicle and the second pollutant value outside the passenger compartment; when the vehicle meets the preset air conditioning setting conditions, the second ambient air temperature and humidity conditions, and the vehicle wheel end load conditions, controlling the engine to run at a constant speed for a preset period of time based on a preset engine running strategy, and after the engine stops running, controlling the vehicle to run based on a second target pollutant concentration value and a preset air conditioning running strategy, measuring the third pollutant value in the passenger compartment and the fourth pollutant value outside the passenger compartment; obtaining a first air purification efficiency based on the first pollutant value and the second pollutant value, and obtaining a second air purification efficiency of the passenger compartment based on the third pollutant value and the fourth pollutant value, and obtaining a comprehensive purification efficiency value of the passenger compartment according to the first air purification efficiency and the second air purification efficiency.

[0009] Optionally, obtaining the first air purification efficiency based on the first pollutant value and the second pollutant value, and obtaining the second air purification efficiency of the passenger compartment based on the third pollutant value and the fourth pollutant value, comprises: calculating the first air purification efficiency and the second air purification efficiency using a preset pollutant purification efficiency calculation formula, wherein the preset pollutant purification efficiency calculation formula is:

[0010]

[0011] η PM_i is the i-th air purification efficiency, is the average value of PM concentration in the passenger cabin, is the average value of PM concentration outside the passenger cabin.

[0012] Optionally, the obtaining the comprehensive purification efficiency value of the passenger cabin according to the first air purification efficiency and the second air purification efficiency comprises: calculating the comprehensive purification efficiency value of the passenger cabin by using a preset comprehensive purification efficiency value calculation formula, wherein the preset comprehensive purification efficiency value calculation formula is:

[0013] η all = ω × η cool + (1-ω) η hot .

[0014] η all is the comprehensive purification efficiency value, ω is a preset value, η cool is η PM_1 , η hot is η PM_2 .

[0015] Optionally, after obtaining the comprehensive purification efficiency value of the passenger cabin, the method further comprises: judging whether the comprehensive purification efficiency value is less than a warning threshold; and if the comprehensive purification efficiency value is less than the warning threshold, sending a warning information to a target terminal.

[0016] A second aspect of this application provides a measuring device for the air purification efficiency of a vehicle passenger compartment, comprising: a first measuring module, configured to, when the vehicle meets preset air conditioning settings, a first ambient air temperature and humidity condition, and a vehicle wheel-end load condition, control the coolant of the vehicle to decrease to a preset temperature based on a preset immersion strategy, and control the operation of the vehicle based on a first target pollutant concentration value and a preset air conditioning internal circulation strategy, and measure the value of a first pollutant inside the passenger compartment and a second pollutant outside the passenger compartment; and a second measuring module, configured to, when the vehicle meets the preset air conditioning settings, the second ambient air temperature and humidity condition, and the vehicle wheel-end load condition... When the engine stops, the system controls the engine to run at a constant speed for a preset duration based on a preset engine operation strategy. After the engine stops running, the system controls the vehicle operation based on a second target pollutant concentration value and a preset air conditioning operation strategy, and measures the values ​​of a third pollutant inside the passenger compartment and a fourth pollutant outside the passenger compartment. The calculation module is used to obtain a first air purification efficiency based on the first pollutant value and the second pollutant value, and to obtain a second air purification efficiency of the passenger compartment based on the third pollutant value and the fourth pollutant value. Based on the first air purification efficiency and the second air purification efficiency, the system obtains a comprehensive purification efficiency value of the passenger compartment.

[0017] Optionally, the calculation module is further configured to: calculate the first air purification efficiency and the second air purification efficiency using a preset pollutant purification efficiency calculation formula, wherein the preset pollutant purification efficiency calculation formula is:

[0018]

[0019] Where, η PM_i The air purification efficiency is denoted as i. This represents the average PM concentration inside the passenger compartment. This represents the average PM concentration outside the crew cabin.

[0020] Optionally, the calculation module is further configured to: calculate the comprehensive purification efficiency value of the passenger compartment using a preset comprehensive purification efficiency value calculation formula, wherein the preset comprehensive purification efficiency value calculation formula is:

[0021] η all =ω×η cool +(1-ω)η hot ;

[0022] Where, η all The overall purification efficiency value is ω, which is a preset value, and η is the total purification efficiency value. cool For η PM_1 η hot For η PM_2 .

[0023] Optionally, after obtaining the comprehensive purification efficiency value of the passenger cabin, the computing module is further configured to: determine whether the comprehensive purification efficiency value is less than a warning threshold; and send a warning message to a target terminal if the comprehensive purification efficiency value is less than the warning threshold.

[0024] The third aspect of the embodiments of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the program to implement the measurement method of the air purification efficiency of the vehicle passenger cabin as described in the above embodiments.

[0025] The fourth aspect of the embodiments of the present application provides a computer readable storage medium having a computer program stored thereon, and the program is executed by a processor to implement the measurement method of the air purification efficiency of the vehicle passenger cabin as described in the above embodiments.

[0026] In the above embodiments, when the vehicle meets the air conditioning setting condition, the first ambient air temperature and humidity condition, and the vehicle wheel end load condition, the cooling liquid of the vehicle is controlled to be reduced to a preset temperature based on the vehicle soaking strategy, the vehicle is controlled to run based on the first target pollutant concentration value and the air conditioning internal circulation strategy, the first pollutant value in the passenger cabin and the second pollutant value outside the passenger cabin are measured; when the vehicle meets the air conditioning setting condition, the second ambient air temperature and humidity condition, and the vehicle wheel end load condition, the engine is controlled to run at a constant speed for a preset time length, after the engine stops running, the vehicle is controlled to run based on the second target pollutant concentration value and the air conditioning running strategy, the third pollutant value in the passenger cabin and the fourth pollutant value outside the passenger cabin are measured; the first air purification efficiency obtained based on the first pollutant value and the second pollutant value, and the second air purification efficiency of the passenger cabin obtained based on the third pollutant value and the fourth pollutant value are used to obtain the comprehensive purification efficiency value of the passenger cabin. Thus, the problem of low test accuracy for passenger cabin purification in the prior art is solved, and the regulatory department of the automobile industry can effectively test whether the air conditioning purification system efficiency of a certain vehicle model is sufficient to effectively improve the air cleanliness in the vehicle in a polluted environment, and protect the respiratory health of the passengers.

[0027] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0029] Figure 1 A flowchart of a measurement method of the air purification efficiency of a vehicle passenger cabin according to an embodiment of the present application is provided.

[0030] Figure 2 Structure diagram of a measuring device for air purification efficiency of a vehicle passenger cabin according to an embodiment of the present application;

[0031] Figure 3 Arrangement diagram of a probe for measuring PM concentration outside a vehicle according to an embodiment of the present application;

[0032] Figure 4 Flow chart of a measuring method for air purification efficiency of a vehicle passenger cabin in winter according to an embodiment of the present application;

[0033] Figure 5 Flow chart of a measuring method for air purification efficiency of a vehicle passenger cabin in summer according to an embodiment of the present application;

[0034] Figure 6 Example diagram of a measuring device for air purification efficiency of a vehicle passenger cabin according to an embodiment of the present application;

[0035] Figure 7 Structure diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below with reference to the attached drawings, which are meant to be exemplary and not limiting.

[0037] A method, device, equipment and medium for measuring air purification efficiency of a vehicle passenger cabin are described below with reference to the accompanying drawings. To solve the problem of low accuracy of the existing technology for testing the purification of the passenger cabin, the present application provides a method for measuring air purification efficiency of a vehicle passenger cabin. In the method, when the vehicle meets the air conditioning setting condition, the first ambient air temperature and humidity condition, and the vehicle wheel end load condition, the cooling liquid of the vehicle is controlled to decrease to a preset temperature based on the vehicle immersion strategy, the vehicle is controlled to run based on the first target pollutant concentration value and the air conditioning internal circulation strategy, and the first pollutant value in the passenger cabin and the second pollutant value outside the passenger cabin are measured. When the vehicle meets the air conditioning setting condition, the second ambient air temperature and humidity condition, and the vehicle wheel end load condition, the engine is controlled to run at a constant speed for a preset time, and after the engine stops running, the vehicle is controlled to run based on the second target pollutant concentration value and the air conditioning running strategy, and the third pollutant value in the passenger cabin and the fourth pollutant value outside the passenger cabin are measured. The first air purification efficiency is obtained based on the first pollutant value and the second pollutant value, the second air purification efficiency of the passenger cabin is obtained based on the third pollutant value and the fourth pollutant value, and the comprehensive purification efficiency value of the passenger cabin is obtained. Thus, the problem of low accuracy of the existing technology for testing the purification of the passenger cabin is solved, and the regulatory department of the automobile industry can effectively test whether the air purification system efficiency of a certain vehicle model is sufficient to effectively improve the air cleanliness in the vehicle in a polluted environment, thereby protecting the respiratory health of the passengers.

[0038] Specifically, Figure 1 A flowchart of a method for measuring air purification efficiency of a vehicle passenger cabin is provided in the present application.

[0039] As Figure 1 shown, the method for measuring air purification efficiency of a vehicle passenger cabin includes the following steps:

[0040] The method for measuring air purification efficiency of a vehicle passenger cabin is measured by an air purification efficiency measuring device, wherein the structure of the air purification efficiency measuring device is as shown in Figure 2 The air purification efficiency measuring device includes an engine air intake supply device 1, an engine exhaust output device 2, a PM sensor 3 in the passenger cabin, a PM sensor 4 outside the passenger cabin, a rotary drum dynamometer 5, a particulate matter PM generator 6, a comparison and calculation system 7, a control unit 8 of the pollutant injection system, a fan 9, a sealed bin 10 of the RL-SHED, a temperature and humidity adjusting device 11 of the sealed bin of the RL-SHED, and a test bin shell 12 outside the RL-SHED.

[0041] The application includes a whole vehicle closed cabin pollutant injection system, a double-channel pollutant measurement system for sampling the passenger cabin and the environment outside the vehicle respectively, and a comparative calculation system for calculating the purification efficiency by operating the double-channel values. These devices are coordinated with the whole vehicle closed cabin of the running loss evaporation test integrated cabin (RL-SHED) and the four-wheel drum chassis dynamometer that have been applied today.

[0042] The running loss evaporation test integrated cabin (RL-SHED) is a test device that has been commercialized in the automotive industry. The engine intake and exhaust gas of the vehicle are transported through a special gas pipeline, which is isolated from the air in the closed cabin where the vehicle is located, such as Figure 2 1 and 2. The function of the four-wheel drum chassis dynamometer of the device is to provide appropriate simulated resistance based on real-time vehicle speed, so that the vehicle can reproduce the conditions of driving on the road when it drives on it. The temperature, humidity and airflow blowing to the vehicle in the closed cabin of the whole vehicle are monitored by the components of the RL-SHED, and can be controlled within the range of ±2℃ of the specified temperature value and ±5% of the specified humidity value; the cooling fan provides an air speed equal to the value of the speed adopted in the cycle, so as to cool the vehicle power system and make the gas in the closed cabin uniform.

[0043] A pollutant injection system composed of a particulate matter PM generator, a PM sensor and a control unit is added to the whole vehicle closed cabin, and PID control is adopted. During formal testing, the pollutant concentration in the closed cabin is stabilized at the specified value by the injection system. Before formal testing, the vehicle is pretreated by driving, soaking, and irradiating solar radiation intensity of 850W / m2. Before the end of the pretreatment, the pollutant injection system gradually increases the pollutant concentration in the closed cabin from nearly zero to the specified value. Formal testing is divided into two cases representing winter and summer. In the former case, the vehicle air conditioning system selects internal circulation and other settings operate according to the requirements of clause A.2.4 "Heater and defroster settings" of Appendix A of standard GB / T 19233, and in the latter case, the vehicle air conditioning system operates according to the requirements of clause B.2.4 "Air conditioning settings" of Appendix B of GB / T 19233. The air conditioning filtration function reduces the PM value in the passenger cabin, so that the output value of the passenger cabin gas PM sensor will be lower than the PM value of the environment outside the vehicle. The double-channel pollutant measurement system measures the pollutant values in the passenger cabin and the environment outside the vehicle respectively, and sends them to the comparative calculation system. After the completion of the CLTC_P cycle for 30 minutes, the comparative calculation system calculates the purification efficiency of each of the winter and summer cases by averaging the respective second particulate matter PM concentration values and other values of the two channels offline, and then weighted sum to obtain the comprehensive purification efficiency.

[0044] One of the devices of the present application is a dual-channel pollutant measurement system, each channel consisting of a measurement device, a conduit, and a sampling probe. The particulate matter measurement device uses a particulate matter PM sensor or a particulate matter sampling instrument in accordance with HJ 93-2013, with a resolution better than 1.0 μg / m3 and a sampling frequency not less than 1 Hz, including but not limited to LD-5 type laser dust instrument, TSI8350, etc.; preferably, the particulate matter sampling instrument is equipped with a PM2.5 cutter. The sampling probe for measuring the pollutants in the passenger compartment in this channel is installed at the midpoint of the line connecting the center points of the headrests of the front two seats, pointing horizontally to the front of the vehicle; the measurement device (sensor) for measuring the pollutants outside the vehicle in this channel is connected to the sampling probe outside the vehicle, which has the same height from the ground as the sampling probe inside the passenger compartment, and the orientation is as shown in Figure 3 Figure, i.e., it is installed on the outside of the second-row seat window glass of the vehicle, pointing horizontally to the front of the vehicle, 15±2 cm away from the window glass, and the distance from the rearview mirror should be sufficient to avoid the influence of the vortex caused by the disturbance of the air flow by the latter, i.e., the air flow blown by the fan has generally shown a stable laminar flow when it reaches the probe after passing through the rearview mirror, which is conducive to stable and accurate measurement.

[0045] The second device of the present application is a pollutant injection system in a closed chamber, which functions to provide particulate matter PM2.5 and other pollutant gases and to stabilize the concentration in the closed chamber at a set value. For example, in terms of particulate matter PM2.5, the corresponding components include a PM generator, a PM sensor, and a control unit, and the corresponding consumables are ISO 12103-1A0 (0-5 μm test dust, preferably 0-3 μm test dust). During formal testing, the control unit uses PID control based on the numerical relationship between the value of the PM sensor and the set value, and issues a command value to the particulate matter PM generator in real time to generate a certain amount of PM, thereby making the PM value in the closed chamber approach and reach the set value. The particulate matter PM generator as the PID control instruction signal executor includes but is not limited to RBG dust generator, QRJ-300 aerosol generator, dust aerosol generator DAG768, etc. The reason for additional injection of pollutants during formal testing is that the PM concentration in the closed chamber will decrease due to two factors: first, a part of the clean gas that is sucked into the passenger compartment by the vehicle air conditioner will continue to return to the closed chamber through the one-way ventilation valve of the air outlet located on the wings of the rear seats of the passenger compartment, causing a small amount of dilution of the PM concentration in the closed chamber; second, the particulate matter deposition characteristics cause it to continuously settle on the vehicle body shell and the test device shell in a small amount. Preferably, the PM sensor of the pollutant injection system should be the same as the PM sensor for measuring pollutants outside the vehicle in the dual-channel pollutant measurement system. In particular, one PM sensor can be used to measure the PM value in the closed chamber required for the control of this injection system and to measure the PM value of pollutants outside the vehicle in the dual-channel pollutant measurement system, thereby reducing the cost of the entire device.

[0046] The pollutant injection system can be similarly configured with other pollutant gas generators, sensors and control units, such as NO2. The PID control is used to stabilize the concentration of the pollutant gas in the closed chamber at a set value for testing. For vehicles equipped with filters and other components in the air conditioning system that have NO2 conversion capabilities, the purification efficiency of the pollutant gas is calculated after obtaining the values of the two measurement channels of the pollutant in the formal test.

[0047] In step S101, when the vehicle meets the preset air conditioning setting condition, the first ambient air temperature and humidity condition, and the vehicle wheel end load condition, the vehicle cooling liquid is controlled to reduce to a preset temperature based on a preset vehicle soaking strategy, and the vehicle is controlled to run based on a first target pollutant concentration value and a preset air conditioning internal circulation strategy. The first pollutant value in the passenger compartment of the vehicle and the second pollutant value outside the passenger compartment are measured.

[0048] The preset air conditioning setting condition is that the air conditioning filter of the vehicle is replaced with a component aged for 3000 km, and the vehicle wheel end load condition is that the vehicle is moved onto a drum, bound, and connected to the power system inlet and exhaust of the vehicle. The vehicle is coasting to set the simulated load of the drum.

[0049] In step S102, when the vehicle meets the preset air conditioning setting condition, the second ambient air temperature and humidity condition, and the vehicle wheel end load condition, the engine is controlled to run at a constant speed for a preset time based on a preset engine running strategy, and after the engine stops running, the vehicle is controlled to run based on a second target pollutant concentration value and a preset air conditioning running strategy. The third pollutant value in the passenger compartment and the fourth pollutant value outside the passenger compartment are measured.

[0050] In step S103, a first air purification efficiency is obtained based on the first pollutant value and the second pollutant value, a second air purification efficiency of the passenger compartment is obtained based on the third pollutant value and the fourth pollutant value, and a comprehensive purification efficiency value of the passenger compartment is obtained according to the first air purification efficiency and the second air purification efficiency.

[0051] Optionally, in some embodiments, obtaining the first air purification efficiency based on the first pollutant value and the second pollutant value, and obtaining the second air purification efficiency of the passenger compartment based on the third pollutant value and the fourth pollutant value, comprises: calculating the first air purification efficiency and the second air purification efficiency using a preset pollutant purification efficiency calculation formula, wherein the preset pollutant purification efficiency calculation formula is:

[0052]

[0053] wherein η PM_i is the i-th air purification efficiency, is the average PM concentration in the passenger compartment, is the average value of the PM concentration outside the passenger cabin.

[0054] Optionally, in some embodiments, according to the first air purification efficiency and the second air purification efficiency, obtaining a comprehensive purification efficiency value of the passenger cabin comprises: calculating the comprehensive purification efficiency value of the passenger cabin by using a preset comprehensive purification efficiency value calculation formula, wherein the preset comprehensive purification efficiency value calculation formula is:

[0055] η all = ω × η cool + (1 - ω) η hot ; (2)

[0056] wherein η all is the comprehensive purification efficiency value, ω is a preset value, η cool is η PM_1 , η hot is η PM_2 .

[0057] Optionally, in some embodiments, after obtaining the comprehensive purification efficiency value of the passenger cabin, comprising: judging whether the comprehensive purification efficiency value is less than a warning threshold; if the comprehensive purification efficiency value is less than the warning threshold, sending a warning information to a target terminal.

[0058] It should be understood that the present application places the vehicle in a gas environment full of particulate matter PM2.5 and with a controlled concentration. The set pollutant concentration value, the ambient air temperature and humidity conditions and the vehicle wheel end load conditions can make the vehicle as a whole and the vehicle air conditioning system be in a representative condition of various external conditions experienced during its normal operation, so that the maintenance passenger cabin gas cleaning function and performance of the tested vehicle can be normally exhibited. For example, for vehicles with an automatic control system, a preset strategy for its operation in a test representing winter is that its air flow management is switched according to the cold and hot conditions of the vehicle, which restricts the evolution of the PM and other pollutants concentration of the passenger cabin gas: in the initial few minutes of the test, the engine coolant temperature has not yet risen from 5°C to above 50°C, the engine does not heat the gas, and the automatic air conditioning system controls the gas flow from outside the vehicle into the passenger cabin at the lowest air volume or nearly no air intake. The duration of the restricted condition depends on the technical means used by each vehicle model to accelerate the engine water temperature, for example, about 200s or about 300s.

[0059] Specifically, two particulate matter PM2.5 concentration setting conditions are used in the closed warehouse to measure the performance of the vehicle air conditioning system in purifying the passenger cabin air in a cold and heavily polluted environment and in a hot and lightly polluted environment, respectively. The former corresponds to the PM2.5 serious condition in winter, and the latter corresponds to the relatively less serious PM2.5 condition in summer, which are referred to as condition 1 and condition 2, respectively.

[0060] Wherein, a pretreatment link is arranged before the formal test link of the present application.

[0061] The pretreatment link of case 1, i.e. the vehicle pretreatment link in winter, is carried out according to A.3.2.4-A.3.2.7 and A3.3 of Appendix A of GB / T 19233-2020, except that the ambient temperature is changed from -7℃ to 5℃, and the pollutant injection system is started after the end of the vehicle immersion to make the PM and other pollutants in the closed warehouse reach the target value within 30 minutes. Each filter unit of the tested air conditioner should be aged for 3000km equivalent, and the aging method includes but is not limited to ISO / TS11155-1 standard.

[0062] The pretreatment link of case 2, i.e. the vehicle pretreatment link in summer, is carried out according to B.3.3.1-B.3.3.3 of Appendix B of GB / T 19233-2020, and the pollutant injection system is started in the 30-minute vehicle immersion link of B.3.3.3 with an illumination solar radiation intensity of 850W / m2 to make the pollutants in the closed warehouse reach the target value at the end of the vehicle immersion. Further, the test warehouse, equipment in the warehouse, surfaces of the tested object and clothes of the test operator should be removed of PM or dust before the pretreatment link, for example, using a wet wipe. Each filter unit of the tested air conditioner should be aged for 3000km equivalent, and the aging method includes but is not limited to ISO / TS11155-1 standard.

[0063] Preferably, the first ambient air temperature and humidity conditions in winter are temperature 5℃ and humidity 50%, and the first pollutant value, i.e. PM value, is 120μg / m3. The second ambient air temperature and humidity conditions in summer are illumination solar radiation intensity 850W / m2, temperature 30℃ and humidity 50%, and the second pollutant value, i.e. PM value, is 40μg / m3. Further, the PM value in case 1 and case 2 is also an option for the test environment PM value, which is within 1-1.3 times of the preferred value, and is determined according to the typical value of the recent annual PM value of the major car-owning provinces in the country in the two seasons.

[0064] The air conditioning system of the vehicle participating in case 1 test is selected to use internal circulation, and other settings are according to the provisions of A.2.4 of Appendix A of GB / T 19233-2020. The settings of the air conditioning system of the vehicle participating in case 2 test are according to the provisions of B.2.4 of Appendix B of GB / T 19233-2020. The vehicle runs CLTC_P operating mode during the formal test.

[0065] Further, the measured parameter values are calculated to obtain a comparative calculation system and method of purification efficiency. After the formal test CLTC_P cycle is completed, the first pollutant value in the passenger compartment and the second pollutant value outside the passenger compartment in winter, and the third pollutant value in the passenger compartment and the fourth pollutant value outside the passenger compartment in summer, the comparative calculation system offline averages the pollutant values of the two channels during the formal test 1800s, and the purification efficiency of PM pollutants in winter (i.e. the first air purification efficiency) and the purification efficiency of PM pollutants in summer (i.e. the second air purification efficiency) are obtained by formula (1).

[0066] Finally, the two purification efficiency results of the aforementioned respectively representing case 1 and case 2, i.e. the first air purification efficiency and the second air purification efficiency, need to be weighted and summed based on the relative weight of the days they occupy in a year, and the comprehensive purification efficiency value ηall in a year is obtained by formula (2).

[0067] This test method realizes a laboratory test on a complete vehicle as an object, which repeatedly simulates the change process of the air state in the passenger compartment when the vehicle drives on a road with air pollution, and the test has sufficient representativeness and the test process is easy to operate.

[0068] In order for those skilled in the art to further understand the measurement method of the vehicle passenger compartment air purification efficiency of the embodiments of the present application, the following will be described in detail in conjunction with specific embodiments, such as Figure 4 and Figure 5 as shown.

[0069] The measurement method of the air purification efficiency in winter is:

[0070] Step 1: Replace the air conditioner filter of the vehicle with a component aged for 3000km, clean and dry the vehicle;

[0071] Step 2: Clean the air in the sealed cabin, adjust the temperature to 5℃ and the humidity to 50%;

[0072] Step 3: Move the vehicle to the drum, bind, connect the power system inlet and exhaust of the vehicle, and slide the vehicle to set the simulated load of the drum;

[0073] Step 4: Run the vehicle to perform pretreatment according to the CLTC_P cycle;

[0074] Step 5: Soak the vehicle for 8 hours, and reduce the temperature of the vehicle coolant to 5±2℃;

[0075] Step 6: Connect the sampling pipelines of the two channels to the designated positions in the vehicle and the position of the "vehicle outer sealed cabin", respectively;

[0076] Step 7: Close the vehicle door and windows, turn on the PM generator of the test device, and make the PM value climb to 120 μg / m 3 and keep;

[0077] Step 8: Open the vehicle door for 30 s to make the air in the passenger compartment consistent with the sealed cabin, and then close the door;

[0078] Step 9: Turn on the instruments, and set the vehicle air conditioning system to the inner loop and other settings according to the provisions of GB / T 19233 Appendix A, for example, front defrosting;

[0079] Step 10: Run the CLTC_P test cycle to perform formal testing, and record the values of the two channels;

[0080] Step 11: Calculate the air purification efficiency of the vehicle passenger compartment by formula (1).

[0081] The measurement method of the air purification efficiency in summer is as follows:

[0082] Step 1: Replace the air conditioner filter of the vehicle with a component aged for 3000 km, and clean and dry the vehicle;

[0083] Step 2: Clean the air in the sealed cabin, and adjust the temperature to 30°C and the humidity to 50%;

[0084] Step 3: Move the vehicle to the drum, bind it, connect the vehicle power system inlet and exhaust, and slide the vehicle to set the simulated load of the drum

[0085] Step 4: Run the vehicle at a constant speed of 90 km / h for 20 minutes for pretreatment;

[0086] Step 5: Connect the sampling pipelines of the two channels to the designated positions in the vehicle and the designated positions of the “vehicle outer sealed cabin”;

[0087] Step 6: Turn off the engine and vehicle door and windows. Set the solar radiation intensity, and place the vehicle

[0088] Step 7: Turn on the PM generator to make the PM value climb to 40 μg / m 3 and keep;

[0089] Step 8: When the vehicle is placed for 30 minutes, open the door for 30 s to make the air in the passenger compartment consistent with the sealed cabin, and then close the door;

[0090] Step 9: Turn on the instruments, and set the vehicle air conditioning system according to GB / T 19233 Appendix B;

[0091] Step 10: Run the CLTC_P test cycle to perform formal testing, and record the values of the two channels;

[0092] Step 11: Calculate the air purification efficiency of the passenger cabin of the vehicle according to formula (1).

[0093] Based on this test method, the regulatory department of the automobile industry can effectively test whether the air purification system efficiency of a certain vehicle model is sufficient to effectively improve the air cleanliness in the vehicle in a polluted environment, and protect the respiratory health of the passengers. Further, the corresponding evaluation regulations can specify the threshold value of the air purification efficiency value, such as the median or average of the statistical quantity of the air purification efficiency value of the vehicle group obtained after testing a plurality of representative vehicle models by the test method. The regulations and thresholds can guide the popularization of more advanced air purification systems for passenger vehicles, and promote industrial progress.

[0094] According to the vehicle passenger cabin air purification efficiency measurement method proposed in the embodiments of the present application, when the vehicle meets the air conditioning setting condition, the first ambient air temperature and humidity condition, and the vehicle wheel end load condition, the cooling liquid of the vehicle is controlled to be reduced to a preset temperature based on the vehicle immersion strategy, the vehicle is controlled to run based on the first target pollutant concentration value and the air conditioning internal circulation strategy, and the first pollutant value in the passenger cabin and the second pollutant value outside the passenger cabin are measured; when the vehicle meets the air conditioning setting condition, the second ambient air temperature and humidity condition, and the vehicle wheel end load condition, the engine is controlled to run at a constant speed for a preset time, and after the engine stops running, the vehicle is controlled to run based on the second target pollutant concentration value and the air conditioning running strategy, and the third pollutant value in the passenger cabin and the fourth pollutant value outside the passenger cabin are measured; the first air purification efficiency is obtained based on the first pollutant value and the second pollutant value, and the second air purification efficiency of the passenger cabin is obtained based on the third pollutant value and the fourth pollutant value, and the comprehensive purification efficiency value of the passenger cabin is obtained.

[0095] Secondly, the vehicle passenger cabin air purification efficiency measurement device according to the embodiments of the present application is described with reference to the accompanying drawings.

[0096] Figure 6 is a block schematic diagram of the vehicle passenger cabin air purification efficiency measurement device according to the embodiments of the present application.

[0097] As Figure 6 shown, the vehicle passenger cabin air purification efficiency measurement device 10 includes a first measurement module 100, a second measurement module 200, and a calculation module 300.

[0098] The first measurement module 100 is configured to, when the vehicle meets preset air conditioning setting conditions, first ambient air temperature and humidity conditions, and vehicle wheel end load conditions, control the vehicle to reduce the cooling liquid to a preset temperature based on a preset vehicle soaking strategy, and control the vehicle to run based on a first target pollutant concentration value and a preset air conditioning internal circulation strategy, measure a first pollutant value in the passenger compartment of the vehicle and a second pollutant value outside the passenger compartment; the second measurement module 200 is configured to, when the vehicle meets preset air conditioning setting conditions, second ambient air temperature and humidity conditions, and vehicle wheel end load conditions, control the engine to run at a constant speed for a preset time length based on a preset engine running strategy, and after the engine stops running, control the vehicle to run based on a second target pollutant concentration value and a preset air conditioning running strategy, measure a third pollutant value in the passenger compartment and a fourth pollutant value outside the passenger compartment; the calculation module 300 is configured to obtain a first air purification efficiency based on the first pollutant value and the second pollutant value, obtain a second air purification efficiency of the passenger compartment based on the third pollutant value and the fourth pollutant value, and obtain a comprehensive purification efficiency value of the passenger compartment according to the first air purification efficiency and the second air purification efficiency.

[0099] Optionally, in some embodiments, the calculation module 300 is further configured to calculate the first air purification efficiency and the second air purification efficiency by using a preset pollutant purification efficiency calculation formula, wherein the preset pollutant purification efficiency calculation formula is:

[0100]

[0101] wherein η PM_i is the i-th air purification efficiency, is the average PM concentration in the passenger compartment, is the average PM concentration outside the passenger compartment.

[0102] Optionally, in some embodiments, the calculation module 300 is further configured to calculate the comprehensive purification efficiency value of the passenger compartment by using a preset comprehensive purification efficiency value calculation formula, wherein the preset comprehensive purification efficiency value calculation formula is:

[0103] η all = ω × η cool + (1-ω) η hot ;

[0104] wherein η all is the comprehensive purification efficiency value, ω is a preset value, η cool is η PM_1 , and η hot is η PM_2 .

[0105] Optionally, in some embodiments, after obtaining the comprehensive purification efficiency value of the passenger cabin, the computing module 300 is further configured to: determine whether the comprehensive purification efficiency value is less than a warning threshold; and if the comprehensive purification efficiency value is less than the warning threshold, send a warning message to the target terminal.

[0106] It should be noted that the above description of the measurement method of the air purification efficiency of the vehicle passenger cabin is also applicable to the measurement device of the air purification efficiency of the vehicle passenger cabin of this embodiment, which will not be described here.

[0107] The measurement device of the air purification efficiency of the vehicle passenger cabin provided by the embodiments of the present application can control the cooling liquid of the vehicle to be reduced to a preset temperature based on the vehicle immersion strategy when the vehicle meets the air conditioning setting condition, the first ambient air temperature and humidity condition, and the vehicle wheel end load condition, control the vehicle to run based on the first target pollutant concentration value and the air conditioning internal circulation strategy, measure the first pollutant value in the passenger cabin and the second pollutant value outside the passenger cabin, control the engine to run at a constant speed for a preset time length when the vehicle meets the air conditioning setting condition, the second ambient air temperature and humidity condition, and the vehicle wheel end load condition, control the vehicle to run based on the second target pollutant concentration value and the air conditioning running strategy after the engine stops running, measure the third pollutant value in the passenger cabin and the fourth pollutant value outside the passenger cabin, obtain the first air purification efficiency based on the first pollutant value and the second pollutant value, obtain the second air purification efficiency of the passenger cabin based on the third pollutant value and the fourth pollutant value, and obtain the comprehensive purification efficiency value of the passenger cabin. Thus, the problem of low test accuracy for passenger cabin purification in the prior art is solved, and the regulatory department of the automobile industry can effectively test whether the air conditioning purification system efficiency of a certain vehicle model is sufficient to effectively improve the air cleanliness in the vehicle in a polluted environment, thereby protecting the respiratory health of the passengers.

[0108] Figure 7 The structure schematic diagram of the electronic device provided by the embodiments of the present application is provided. The electronic device can include:

[0109] The memory 701, the processor 702, and the computer program stored in the memory 701 and executable on the processor 702.

[0110] The processor 702 executes the program to implement the measurement method of the air purification efficiency of the vehicle passenger cabin provided in the above embodiments.

[0111] Further, the electronic device further includes:

[0112] The communication interface 703 is used for communication between the memory 701 and the processor 702.

[0113] The memory 701 is used to store the computer program executable on the processor 702.

[0114] The memory 701 can include a high-speed RAM memory, and can also include a non-volatile memory, for example, at least one disk memory.

[0115] If the memory 701, the processor 702 and the communication interface 703 are implemented independently, the communication interface 703, the memory 701 and the processor 702 can be connected to each other through a bus and complete communication between each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 7 In the figure, only one thick line is used to represent, but it does not mean that there is only one bus or one type of bus.

[0116] Optionally, in a specific implementation, if the memory 701, the processor 702 and the communication interface 703 are integrated on a chip, the memory 701, the processor 702 and the communication interface 703 can complete communication between each other through an internal interface.

[0117] The processor 702 can be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0118] The embodiments of the present application also provide a computer readable storage medium, having stored thereon a computer program, which is executed by a processor to implement the above-mentioned method for measuring air purification efficiency of a vehicle passenger cabin.

[0119] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, the usage of "N" means at least two, for example two, three or the like, unless explicitly stated otherwise.

[0120] Furthermore, the terms "first", "second", or the like, are used merely as a designation of certain elements or features of the application, and do not imply or connote relative importance or a specific order of precedence. Thus, features defined with "first", "second", etc. can include at least one of the features, either explicitly or implicitly.

[0121] Any process or method descriptions or blocks in flow charts or otherwise described herein represent embodiments of modules, segments, or portions of code which include one or more executable instructions for implementing specific logic functions or steps, and alternate implementations are possible. In some embodiments, the processes or methods described in flow charts or otherwise described herein are not necessarily performed in the order shown or discussed, including, for example, as performed by a computer processor. Alternate implementations can perform functions or steps described in different orders, including substantially concurrently, or in reverse order.

[0122] The logic and / or steps represented in flow diagrams or otherwise described herein, for example, can be considered as a sequence of instructions to implement logic functions, and can be embodied in any computer-readable storage medium for use by an instruction execution system, apparatus, or device, such as a computer-based system, processor- containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. In the context of this specification, a "computer-readable storage medium" can be any means that can contain, store, communicate, propagate or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable storage medium can be a computer- readable storage medium that can be any media that can be used to store the desired program instructions in a form readable by a computer. More specific examples (a non-exhaustive list) of the computer-readable storage medium include the following: an electrical connection having one or more wires (electrical connections), a portable computer diskette (magnetic), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, and a portable compact disc read-only memory (CD-ROM). In addition, the computer-readable storage medium can even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example, via an optical scanner, then compiled, interpreted, or otherwise processed, and stored in a computer memory in a form that can be used by the computer. Data signals embodied in carrier waves, for example, are included as computer-readable storage media in this context.

[0123] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, the N steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As such, if implemented in hardware, and in another embodiment, any of the following technologies, known in the art, or their combinations can be used: discrete logic circuitry having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0124] Those skilled in the art can understand that all or part of the steps carried out by the above-mentioned embodiment methods can be completed by programs instructing related hardware, and the programs can be stored in a computer-readable storage medium. When the programs are executed, they include one or a combination of the steps of the method embodiments.

[0125] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing module, or each of the units can be physically present separately, or two or more units can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software functional module. When the integrated module is realized in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0126] The computer readable storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method of measuring the air purification efficiency of a vehicle passenger compartment, characterized by, The method comprises the following steps: When the vehicle meets preset air conditioning setting conditions, first ambient air temperature and humidity conditions, and vehicle wheel end load conditions, the cooling liquid of the vehicle is controlled to reduce to a preset temperature based on a preset vehicle soaking strategy, and the vehicle is controlled to run based on a first target pollutant concentration value and a preset air conditioning internal circulation strategy, and a first pollutant value in a passenger compartment of the vehicle and a second pollutant value outside the passenger compartment are measured; When the vehicle meets the preset air conditioning setting conditions, second ambient air temperature and humidity conditions, and vehicle wheel end load conditions, the engine is controlled to run at a constant speed for a preset time length based on a preset engine running strategy, and after the engine stops running, the vehicle is controlled to run based on a second target pollutant concentration value and a preset air conditioning running strategy, and a third pollutant value in the passenger compartment and a fourth pollutant value outside the passenger compartment are measured; A first air purification efficiency is obtained based on the first pollutant value and the second pollutant value, a second air purification efficiency of the passenger compartment is obtained based on the third pollutant value and the fourth pollutant value, and a comprehensive purification efficiency value of the passenger compartment is obtained according to the first air purification efficiency and the second air purification efficiency.

2. The method of claim 1, wherein, The first air purification efficiency is obtained based on the first pollutant value and the second pollutant value, and the second air purification efficiency of the passenger compartment is obtained based on the third pollutant value and the fourth pollutant value, comprising: The first air purification efficiency and the second air purification efficiency are calculated by using a preset pollutant purification efficiency calculation formula, wherein the preset pollutant purification efficiency calculation formula is: wherein η PM_i is the i-th air purification efficiency, is the average value of the PM concentration inside the passenger compartment, is the average value of the PM concentration outside the passenger compartment.

3. The method of claim 2, wherein, The comprehensive purification efficiency value of the passenger compartment is obtained according to the first air purification efficiency and the second air purification efficiency, comprising: The comprehensive purification efficiency value of the passenger compartment is calculated by using a preset comprehensive purification efficiency value calculation formula, wherein the preset comprehensive purification efficiency value calculation formula is: η all = ω x η cool + (1 - ω) η hot ; Wherein, η all is the comprehensive purification efficiency value, ω is a preset value, η cool is η PM_1 , η hot is η PM_2 .

4. The method of claim 1, wherein, After the comprehensive purification efficiency value of the passenger compartment is obtained, comprising: It is judged whether the comprehensive purification efficiency value is less than a warning threshold value; If the comprehensive purification efficiency value is less than the warning threshold value, a warning information is sent to a target terminal.

5. A device for measuring the air purification efficiency of a vehicle passenger compartment, characterized by Comprising: The first measurement module is used for, when the vehicle meets preset air conditioning setting conditions, first ambient air temperature and humidity conditions, and vehicle wheel end load conditions, controlling the cooling liquid of the vehicle to reduce to a preset temperature based on a preset vehicle soaking strategy, and controlling the vehicle to run based on a first target pollutant concentration value and a preset air conditioning internal circulation strategy, and measuring a first pollutant value in a passenger compartment of the vehicle and a second pollutant value outside the passenger compartment. The second measuring module is configured to control the engine to run at a constant speed for a preset time period based on a preset engine operation strategy when the vehicle meets the preset air conditioning setting condition, the second ambient air temperature and humidity condition, and the vehicle wheel end load condition, and control the vehicle to run based on a second target pollutant concentration value and a preset air conditioning operation strategy after the engine stops running, measure a third pollutant value in the passenger cabin and a fourth pollutant value outside the passenger cabin. The calculating module is configured to obtain a first air purification efficiency based on the first pollutant value and the second pollutant value, obtain a second air purification efficiency of the passenger cabin based on the third pollutant value and the fourth pollutant value, and obtain a comprehensive purification efficiency value of the passenger cabin according to the first air purification efficiency and the second air purification efficiency.

6. The apparatus of claim 5, wherein, The calculating module is further configured to: calculate the first air purification efficiency and the second air purification efficiency by using a preset pollutant purification efficiency calculation formula, wherein the preset pollutant purification efficiency calculation formula is: wherein η PM_i is the i-th air purification efficiency, is the average value of the PM concentration inside the passenger compartment, is the average value of the PM concentration outside the passenger compartment.

7. The apparatus of claim 5, wherein, The calculating module is further configured to: calculate the comprehensive purification efficiency value of the passenger cabin by using a preset comprehensive purification efficiency value calculation formula, wherein the preset comprehensive purification efficiency value calculation formula is: η all = ω x η cool + (1 - ω) η hot ; Wherein, η all is the comprehensive purification efficiency value, ω is a preset value, η cool is η PM_1 , η hot is η PM_2 .

8. The apparatus of claim 5, wherein, After obtaining the comprehensive purification efficiency value of the passenger cabin, the calculating module is further configured to: determine whether the comprehensive purification efficiency value is less than a warning threshold value; if the comprehensive purification efficiency value is less than the warning threshold value, send a warning information to a target terminal.

9. An electronic device, comprising: A computer program product includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor executes the program to implement the method for measuring the air purification efficiency of the vehicle passenger cabin according to any one of claims 1-4.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the method for measuring the air purification efficiency of the vehicle passenger cabin according to any one of claims 1-4.

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