Air purification system and method, non-woven fabric, preparation method of non-woven fabric, storage medium and vehicle

Abstract

The invention discloses an air purification system and method, a non-woven fabric, a preparation method of the non-woven fabric, a storage medium and a vehicle, the air purification system is applied to the vehicle, and the air purification system is characterized by comprising a sensing module used for obtaining gas parameters inside and outside the vehicle; the air purification module is used for purifying air in the vehicle; and the control module is used for controlling the purification module to act according to the gas parameters obtained by the sensing module so as to purify the air in the vehicle. According to the vehicle air purification method and device, vehicle air purification in various scenes can be achieved, the air purification requirements of a user in different scenes are met, and the driving experience of the user is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to an air purification system and method, a non-woven fabric and a preparation method thereof, a storage medium and a vehicle. BACKGROUND

[0002] The air purification means of the vehicle in the prior art is relatively single, and is mostly dependent on passive purification mode, which is difficult to meet the high requirements of modern vehicles on air quality in multiple application scenarios. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To solve the problem that the air purification mode of the vehicle in the prior art is single and difficult to meet the air purification in multiple scenarios, the present application discloses an air purification system in the first aspect, which is applied to a vehicle, and the system comprises:

[0004] In the first aspect, an air purification system is proposed, which is applied to a vehicle, and the system comprises: a sensing module, which is used to acquire gas parameters inside and outside the vehicle; an air purification module, which is used to purify the air inside the vehicle; and a control module, which is used to control the action of the purification module according to the gas parameters acquired by the sensing module, so as to purify the air inside the vehicle.

[0005] The beneficial effects of the above-mentioned scheme are: the sensing module acquires the gas parameters inside and outside the vehicle in real time, and the control module dynamically adjusts the working state of the air purification module according to the parameters, so as to realize more efficient and intelligent control of the air quality inside the vehicle.

[0006] In combination with the above-mentioned first aspect, in a possible implementation manner, the air purification module comprises a sterilization module and an action module.

[0007] In combination with the above-mentioned first aspect, in a possible implementation manner, the sterilization module comprises: a filtering unit, which is used to filter particulate matters in the air; an adsorption unit, which is used to adsorb odors and volatile organic compounds; a catalytic decomposition unit, which is used to decompose the adsorbed volatile organic compounds into water and carbon dioxide; and an antibacterial unit, which is used to eliminate at least part of the bacteria in the air inside the vehicle.

[0008] In combination with the above-mentioned first aspect, in a possible implementation manner, the antibacterial unit comprises a non-woven fabric, and the non-woven fabric comprises a polymer matrix and a chitosan quaternary ammonium salt.

[0009] In combination with the above-mentioned first aspect, in a possible implementation manner, the sterilization module further comprises a dust removal unit, which is used to further filter the particulate matters in the air.

[0010] In a possible implementation manner of the first aspect, the action module comprises at least a window and an air conditioner.

[0011] In a possible implementation manner of the first aspect, the perception module comprises: an in-vehicle perception module configured to acquire the in-vehicle gas parameter, and an out-of-vehicle perception module configured to acquire the out-of-vehicle gas parameter.

[0012] In a possible implementation manner of the first aspect, the control module comprises: a collection unit configured to receive the gas parameter information acquired by the perception module and the execution mechanism state information; an analysis unit configured to receive the information output by the collection unit and determine the current air quality based on a preset algorithm model; and a control unit configured to receive the air quality output by the analysis unit and send a control signal to the air purification module.

[0013] In a possible implementation manner of the first aspect, the perception module comprises at least one sensor of any one of the following: (a) a CO2 sensor configured to acquire CO2; (b) a particulate matter sensor configured to acquire PM2.5; (c) a CO sensor configured to acquire CO; (d) an aldehyde sensor, mainly a formaldehyde sensor, configured to acquire formaldehyde; (e) a benzene sensor, mainly a toluene sensor, configured to acquire toluene; (f) a TVOC sensor configured to acquire total volatile organic compounds; and (g) an H2S sensor configured to acquire H2S gas.

[0014] The second aspect provides an air purification method applied to a vehicle, the method comprising: acquiring gas parameters inside and outside the vehicle; determining a vehicle gas circulation mode based on the gas parameters, and controlling an air purification module to act to purify air inside the vehicle, wherein the air purification module comprises a sterilization unit and an action unit, and the vehicle gas circulation mode comprises an external circulation mode and an internal circulation mode.

[0015] In a possible implementation manner of the second aspect, based on the gas parameters, determining the vehicle gas circulation mode and controlling the air purification module to act comprises: if the in-vehicle gas parameter is greater than a first threshold value, stopping the external circulation mode, and controlling the window to be lowered and the air conditioner to be turned on, so that the in-vehicle gas is discharged.

[0016] In a possible implementation manner of the second aspect, after the in-vehicle gas is discharged, the method further comprises: when the in-vehicle gas parameter is less than the first threshold value, determining an out-of-vehicle gas parameter; if the out-of-vehicle gas parameter is greater than a second threshold value, the vehicle executes a first control strategy; and if the out-of-vehicle gas parameter is less than the second threshold value, the vehicle executes a second control strategy.

[0017] With reference to the second aspect, in a possible implementation manner of the second aspect, the first control strategy comprises: controlling the vehicle to enter an inner circulation mode, and the action unit is controlled to act.

[0018] With reference to the second aspect, in a possible implementation manner of the second aspect, the second control strategy comprises: controlling the vehicle to enter an outer circulation mode, and the action unit is controlled to act.

[0019] In a third aspect, a non-woven fabric is provided, which is applied to the air purification system of the first aspect or the air purification method of the second aspect. The non-woven fabric comprises a polymer matrix and a chitosan quaternary ammonium salt.

[0020] With reference to the third aspect, in a possible implementation manner of the third aspect, the mass ratio of the polymer matrix and the chitosan quaternary ammonium salt is (7-9):(1-3) based on the total mass of the non-woven fabric.

[0021] With reference to the third aspect, in a possible implementation manner of the third aspect, the polymer matrix comprises any one of polypropylene, polyethylene, polyamide, polyester, polyurethane, polyvinyl alcohol and polylactic acid.

[0022] In a fourth aspect, a preparation method of a non-woven fabric is provided, which comprises: mixing raw material system comprising a mixed polymer matrix and a chitosan quaternary ammonium salt, and then obtaining the non-woven fabric through melt extrusion, melt spraying, cooling receiving and hot pressing.

[0023] With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the temperature of the melt extrusion is 180-220℃; and / or the fiber spraying speed of the melt blowing process is 10-20m / s; and / or the cooling receiving temperature is 20-30℃; and / or the hot pressing temperature is 120-150℃, and the time is 10-30s.

[0024] In a fifth aspect, a controller is provided, which comprises a memory and a processor. The memory stores a computer program. The processor is configured to execute the computer program stored in the memory to implement the method of the second aspect.

[0025] In a sixth aspect, a computer readable storage medium is provided, which stores computer program instructions. The computer program instructions are executed by a processor to implement the method of the second aspect.

[0026] In a seventh aspect, a vehicle is provided, which comprises the air purification system of the first aspect, the controller of the fifth aspect and / or the computer readable storage medium of the sixth aspect.

[0027] In an eighth aspect, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the air purification method of the second aspect.

[0028] Additional aspects and advantages of the present application will be apparent from the following description of the application, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and be more fully understood from the following description, taken in conjunction with the accompanying drawings, wherein:

[0030] Figure 1 is a schematic diagram of an air purification system according to an embodiment of the present application;

[0031] Figure 2 is a schematic diagram of another structure of a sterilization unit according to an embodiment of the present application;

[0032] Figure 3 is a schematic diagram of a control module according to an embodiment of the present application;

[0033] Figure 4 is a flow chart of an air purification method according to an embodiment of the present application;

[0034] Figure 5 is a schematic diagram of sterilization rate of Staphylococcus aureus by the sterilization unit according to an embodiment of the present application;

[0035] Figure 6 is a schematic diagram of sterilization rate of Escherichia coli by the sterilization unit according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] In order to make persons skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that the embodiments described herein are merely examples from a whole class of embodiments of which the application is a part. It is further expressly understood that the application is intended to encompass all structures and their equivalents that do not depart from the spirit of the application.

[0038] The gas parameter in the application is an index for characterizing air quality. When the parameter of PM2.5 collected in a certain time period is greater than a preset threshold value, it is considered that the air quality is poor at this time, and when it is less than the preset threshold value, it is considered that the air quality is better. Multiple threshold values can also be set to make the judgment of air quality more accurate.

[0039] As shown in Figure 1 The first aspect of the application discloses an air purification system, Figure 1 is a schematic diagram of an air purification system provided in the embodiment of the application, and the embodiment can be applied to purify the air inside a vehicle. As shown in Figure 1 The air purification system disclosed in the first aspect of the application comprises a sensing module and a control module. The sensing module can obtain the gas parameters inside and outside the vehicle. The air purification module is used to purify the air inside the vehicle. The control module is used to control the action of the purification module according to the gas parameters obtained by the sensing module, so as to purify the air inside the vehicle.

[0040] Specifically, the sensing module is composed of at least one sensor. When it is one, it can obtain both the air parameter inside the vehicle and the air parameter outside the vehicle. For example, a sensor is arranged at a position where one side of the vehicle body such as the vehicle roof, the vehicle door, the vehicle window, etc. contacts the outside and the other side contacts the inside. One end of the sensor is exposed to the outside of the vehicle to collect the external air parameter, and the other end is accommodated in the vehicle interior to collect the vehicle interior gas parameter. This arrangement has a lower cost but a lower collection accuracy. When there are multiple sensors, their arrangement is more flexible. The number of sensors arranged inside and outside the vehicle can be different or the same, and the gas parameters collected by the sensors can be different or the same. For example, since the external gas usually only needs to collect the particulate matter parameter such as PM2.5, while the internal gas needs to consider the gas emitted by the vehicle equipment and decoration, such as formaldehyde, toluene, volatile organic compounds, etc., the number of internal sensors can be greater than or equal to the number of external sensors, and the number of internal collected gas parameters can be greater than or equal to the number of external gas parameters. Of course, for different vehicle models, there are different needs, and the number and arrangement of sensors can be adjusted as needed. The air purification module is used to purify the air inside the vehicle. It can purify the air inside the vehicle without contacting the outside, or can introduce external gas to achieve air purification inside the vehicle. The control module receives the gas parameters sent by the sensing module and transmits the control signal to the air purification module based on the gas parameters to control the air purification module to purify the air inside the vehicle.

[0041] For example, the sensing module detects the gas parameters inside and outside the vehicle in real time. When the vehicle interior gas parameter received by the control module is higher than the preset threshold value, the air quality inside the vehicle is poor at present, and the air purification module is controlled to act to purify the air inside the vehicle.

[0042] Further, the sensing module includes an in-vehicle sensing module for obtaining in-vehicle gas parameters and an out-vehicle sensing module for obtaining out-vehicle gas parameters.

[0043] Specifically, as in the foregoing embodiments, the in-vehicle sensing module and the out-vehicle sensing module can each be composed of one or more sensors, or can be integrated into one sensor, wherein it is understood that the number of in-vehicle sensors can be the same as or different from the number of out-vehicle sensors, and the in-vehicle gas parameters can be the same as or different from the out-vehicle gas parameters.

[0044] Further, the sensing module can be arranged in a position close to the human body, such as inside the backrest of the main / assistant driver seat and / or the headrest of the second-row seat, for detecting the air quality inside the passenger compartment, and integrated with the control module and the air purification module. When there are multiple sensing modules, the in-vehicle sensing module can be arranged in a position close to the human body, such as inside the backrest of the main / assistant driver seat and / or the headrest of the second-row seat, and integrated with the control module and the air purification module, while the out-vehicle sensing module is arranged outside the passenger compartment, such as in the air conditioner condenser area or the active air intake grille area, and connected to the in-vehicle sensing module, the control module and the air purification module through a wire harness, for detecting the air quality outside the passenger compartment.

[0045] Thus, the air purification system in the present application obtains the in-vehicle and out-vehicle gas parameters through the sensing module, determines the in-vehicle gas circulation mode based on the gas parameters through the control module, and controls the air purification module to purify the in-vehicle air, thereby improving the in-vehicle air quality and benefiting the health of the passengers.

[0046] In an alternative embodiment, the air purification module includes a sterilization module and an action module.

[0047] Specifically, the sterilization module can remove the bacteria inside the vehicle, which can use a filter screen, ultraviolet rays, ozone, etc. to remove the bacteria inside the vehicle, and the action module is a device that can act, such as a window, an air conditioner, an air duct, etc. It should be noted that the vehicle itself has a mode of controlling the internal or external circulation of the gas. In the internal circulation mode, the air conditioning system only circulates the existing air inside the vehicle without introducing external air, while in the external circulation mode, the air conditioning system introduces external air into the vehicle while discharging part of the internal air.

[0048] Therefore, the air purification system in the application can at least cope with the problem of poor air quality in various scenarios, such as purifying the air quality inside the vehicle by the sterilization module without contacting the outside world, purifying the air inside the vehicle by the action module to exclude the air inside the vehicle and introduce the air outside the vehicle, and purifying the air inside the vehicle by the sterilization module and the action module cooperatively while introducing outside air. It can be understood that this is mainly determined according to the level of the vehicle gas parameter and the vehicle outside air parameter, such as poor air quality inside the vehicle, but the outside air quality is worse, at this time, introducing outside air cannot achieve purification, therefore, at this time, the vehicle window can be closed, and the sterilization module is used to purify the air inside the vehicle, but when the outside air quality is obviously better than the inside, at this time, only the outside air can be introduced into the vehicle, or the sterilization can be performed at the same time.

[0049] Further, the sterilization module has various arrangement modes, which can be integrated with the air conditioner and air duct, or can be an independent device integrated in the center console, co-pilot seat, under the instrument panel, or embedded in the inner side of the door, seat, etc., and can be integrated with the vehicle external circulation system and installed at the front grille or air inlet of the vehicle.

[0050] Therefore, the air purification system in the application has a sterilization module and an action module, which can realize air purification in various scenarios, according to the difference between the vehicle inside and outside air parameters, the control module can select the appropriate purification mode to purify the air inside the vehicle, which realizes the purification of the air inside the vehicle, and also reduces the purification cost, which is beneficial to prolong the service life of the sterilization module inside the vehicle.

[0051] In an optional embodiment, the sterilization module at least includes a filtering unit for filtering particulate matters in the air, an adsorption unit for adsorbing odors and volatile organic compounds, a catalytic decomposition unit for decomposing the adsorbed volatile organic compounds into water and CO2, a filtering unit for eliminating at least part of the bacteria in the air inside the vehicle, and an antibacterial unit for eliminating at least part of the bacteria in the air inside the vehicle.

[0052] Specifically, as shown in FIG. 1, the air purification system in the application includes a sterilization module 1 and an action module 2. Figure 2As shown, the filtering unit functions to filter particulate matters in the air, including but not limited to dust, pollen, PM2.5, etc., to reduce the content of particulate matters in the air in the passenger cabin, thereby playing a "filtering" function. The filtering unit can be provided in a multi-layer structure to have a stronger filtering capacity. The adsorption unit uses adsorption materials (preferably activated carbon, zeolite, silica gel, etc.) to remove odors (such as smoke, food residue, and plastic smell) and volatile organic compounds (such as formaldehyde and acetaldehyde), thereby playing an "adsorption" function. The catalytic decomposition unit decomposes the adsorbed volatile organic compounds into water and carbon dioxide, thereby playing a "decomposition" function. The antibacterial unit is used to kill bacteria (such as E. coli and Staphylococcus aureus) in the air, thereby playing an "antibacterial" function. The antibacterial unit can eliminate at least part of the bacteria in the vehicle, such as bacteria, pollen, and PM2.5, which can be filtered by a filter screen, or bacteria in the air, which can be removed by ultraviolet rays, ozone, etc. mentioned in the foregoing embodiments, thereby achieving the purpose of purifying the air.

[0053] For example, a non-woven fabric can be used as the antibacterial unit. The non-woven fabric is a kind of non-woven material formed by orienting or randomly arranging fibers and then mechanically, thermally, or chemically consolidating the fibers into a sheet-like structure. The non-woven fabric can be naturally decomposed and has a relatively light weight without being spun and woven. The non-woven fabric in the present embodiment includes a polymer matrix and chitosan quaternary ammonium salt. The chitosan quaternary ammonium salt is widely used in the fields of medical treatment and food packaging, and can effectively kill gram-positive bacteria and gram-negative bacteria. The chitosan quaternary ammonium salt material with inherent antibacterial performance is blended and modified with the polymer matrix to prepare non-woven fabric raw particles with nano-level antibacterial particles. The antibacterial non-woven fabric material with persistent antibacterial activity is prepared by a melt-blown process and used as the antibacterial unit to play an antibacterial performance to achieve air purification.

[0054] Further, the sterilization module further includes a dust removal unit. The dust removal unit is used to further filter particulate matters in the air. The dust removal unit captures ultra-fine particulate matters by electrostatic field action, and further removes bacteria, viruses, pollen, dust mites, etc., to further filter particulate matters in the air.

[0055] Thus, the air purification module in the present application achieves the filtration of dust, pollen, and PM2.5, the adsorption of odors and volatile organic compounds, the decomposition of volatile organic compounds, and the killing of bacteria and other harmful substances to the human body by the purification process of "filtering-adsorbing-decomposing-antibacterial", thereby achieving the purification of the air in the vehicle.

[0056] In an alternative embodiment, the action module at least includes a vehicle window and an air conditioner.

[0057] Specifically, the action module can realize the purification of the air in the vehicle by lowering the window and / or turning on the air conditioner in combination with the internal and external circulation of the vehicle gas. In order to facilitate understanding, the present application further describes how to realize air purification. The gas circulation mode includes internal circulation and external circulation. The internal circulation refers to the circulation of the gas only in the vehicle, and the external circulation refers to the circulation of the exchange of the gas in the vehicle with the outside. The vehicle actuator refers to devices such as the window, the air conditioner, the air duct, etc. The actuator can discharge the gas in the vehicle or exchange the gas in the vehicle with the outside gas by the control instruction of the control module, so as to realize the purification of the air in the vehicle.

[0058] In embodiment one, when the control module receives the vehicle internal gas parameter sent by the sensing module and the parameter is higher than the preset threshold, the control action module is controlled to act, the window is lowered, the air conditioner is turned on, the external circulation of the vehicle is closed, and the internal circulation of the vehicle is opened. At this time, the vehicle can quickly discharge the air in the vehicle and purify the air quality, like human exhalation. In this embodiment, the opening degree of the window can be adjusted according to the required air discharge rate. The opening degree of the window is 60%-80%. In this opening degree range, the air discharge rate is fast, and the possibility of the mixing of the external air is low.

[0059] In embodiment two, when the control module receives the vehicle internal gas parameter sent by the sensing module and the parameter is higher than the preset threshold, the control action module is controlled to act, the window is lowered, the air conditioner is turned on, the sterilization module is opened, the internal circulation of the vehicle is opened, and the external circulation of the vehicle is closed. At this time, the vehicle can quickly discharge the air in the vehicle, and the air quality in the vehicle is significantly improved due to the addition of the sterilization module, so as to purify the air quality and improve the air quality in the vehicle. In this embodiment, the opening degree of the window can be adjusted according to the required air discharge rate. The opening degree of the window is 20%-50%. In this opening degree range, the air discharge rate is fast, and the possibility of the mixing of the external air is low.

[0060] In embodiment three, when the control module receives the vehicle internal gas parameter sent by the sensing module and the parameter is higher than the preset threshold, the sterilization module is opened, and the control action module is controlled to act, the window is closed, the internal circulation of the vehicle is opened, the external circulation of the vehicle is closed, and the air purification module is opened. At this time, in the closed space, the air purification module can adsorb and kill the particulate matter, volatile gas, bacteria, etc. on the inner wall of the vehicle, so as to purify the air quality in the vehicle.

[0061] In embodiment four, when the control module receives the vehicle internal gas parameter sent by the sensing module and the parameter is higher than the preset threshold, and the vehicle external gas parameter is lower than the preset threshold, the window is closed, the air conditioner is turned off, and the external circulation of the vehicle is opened. The air in the vehicle is exchanged with the outside air, like human inhalation, so as to purify the air in the vehicle.

[0062] In Example 5, when the control module receives a signal from the sensing module that the gas parameters inside the vehicle are higher than a preset threshold, and the gas parameters outside the vehicle are also higher than a preset threshold, the windows are closed, the air conditioning is turned on, the vehicle's internal circulation is activated, and the air purification module is activated to purify the air inside the vehicle.

[0063] Therefore, the air purification system in this embodiment can purify the air inside the vehicle under different scenarios by raising and lowering the windows, opening and closing the air conditioner, switching between internal and external circulation modes, and turning the air purification module on and off. It is adaptable to multiple scenarios and can also extend the service life of the vehicle's sterilization module after purifying the air inside the vehicle.

[0064] In one optional implementation, the control module includes a data acquisition unit for receiving gas parameter information and air purification module status information acquired by the sensing module; an analysis unit for receiving information output by the data acquisition unit and determining the current air quality based on a preset algorithm model; and a control unit for receiving the air quality output by the analysis unit and sending control signals to the air purification module.

[0065] Specifically, such as Figure 3 As shown, the acquisition unit can receive gas parameters sent by the sensing module and collect information including window opening / closing status, air conditioning on / off status, and air purification module on / off status; the analysis unit can determine the current air quality based on the information received by the acquisition unit and a preset algorithm model. Its functions include:

[0066] (1) Based on the preset algorithm and the current gas parameters, determine whether it is necessary to work together with other equipment (such as air conditioners, windows, air ducts, etc.);

[0067] (2) Formulate specific control decisions, including but not limited to the following situations:

[0068] (a) Decide to activate the blowing strategy to simulate the human body's "exhalation" process and quickly expel the unpleasant gases from the vehicle;

[0069] (b) Decide to activate the air intake strategy to simulate the human body's "inhalation" process and quickly introduce fresh air from outside the vehicle;

[0070] (c) When the air quality inside and outside the vehicle is poor, decide whether to close the windows and turn on the air purification device.

[0071] The control unit is used to send control signals to each air purification module to perform specific purification operations, such as activating the air purification device while closing the car windows.

[0072] Therefore, the control module in the application realizes efficient purification of the air quality in the vehicle, health protection, and improvement of driving and riding comfort by real-time monitoring of the air quality inside and outside the vehicle, intelligent analysis, and collaborative control design.

[0073] In an optional implementation, the perception module includes at least any one of the following sensors: (1) a CO2 sensor for acquiring CO2; (2) a particulate matter sensor for acquiring PM2.5; (3) a CO sensor for acquiring CO; (4) an aldehyde sensor, mainly a formaldehyde sensor, for acquiring formaldehyde; (5) a benzene sensor, mainly a toluene sensor, for acquiring toluene; (6) a TVOC sensor for acquiring total volatile organic compounds; and (7) an H2S sensor for acquiring H2S gas.

[0074] Specifically, the perception module can include any one sensor, such as a particulate matter sensor, which can acquire particulate matter inside and outside the vehicle to determine the air quality inside and outside the vehicle. It can be understood that the perception module can be composed of an in-vehicle perception module and an out-of-vehicle perception module, wherein the in-vehicle perception module is mainly used to detect the gas parameters inside the vehicle, and the out-of-vehicle perception module is used to detect the gas parameters outside the vehicle. The in-vehicle perception module and the out-of-vehicle perception module can be one sensor or can be composed of multiple sensors. It can be understood that the number of sensors required for different configurations of vehicle models is different, such as vehicles without an air purification module, so the type of sensor can be increased or decreased based on the vehicle model on the basis of the present embodiment to achieve adaptation.

[0075] For example, the perception module includes the above-mentioned seven sensors, wherein the in-vehicle perception module includes a CO2 sensor, a particulate matter sensor, a CO sensor, an aldehyde sensor, a benzene sensor, a TVOC sensor, and an H2S sensor, and the out-of-vehicle perception module includes a particulate matter sensor. It can be understood that, according to the configuration of the vehicle, the out-of-vehicle perception module can also be configured the same as the in-vehicle sensor, but the CO2 sensor, the aldehyde sensor, and the benzene sensor are mainly emitted by the vehicle structure or decoration, and mainly collect the gas parameters inside the vehicle, so seven sensors are configured inside the vehicle and one sensor is configured outside the vehicle.

[0076] For another example, the perception module includes the above-mentioned seven sensors, and the in-vehicle perception module and the out-of-vehicle perception module are both composed of the above-mentioned seven sensors, which can realize accurate monitoring of the air quality inside and outside the vehicle.

[0077] Therefore, the perception module realizes comprehensive monitoring of the air quality inside and outside the vehicle through multi-sensor fusion, more accurately purifies the air inside the vehicle, improves the driving experience, and at the same time, the multi-sensor also reserves upgrade space for future intelligentization, and the system has higher flexibility.

[0078] As Figure 4 described above, the second aspect of the present application discloses an air purification method, comprising obtaining gas parameters of the inside and outside of the vehicle; determining a vehicle gas circulation mode based on the gas parameters, and controlling the air purification module to act to purify the air inside the vehicle.

[0079] Specifically, the gas parameters in the embodiment are obtained by a perception module of the vehicle, which is composed of one or more sensors and can accurately collect the gas parameters inside and outside the vehicle. The air purification module is a device for purifying the air inside the vehicle, which can purify the air inside the vehicle when the air quality is poor. The gas circulation mode includes internal circulation and external circulation as described in the first aspect of the present application. The air purification module includes a sterilization module and an action module as described in the first aspect of the present application, and the action module includes a window and an air conditioner.

[0080] Therefore, the control method in the embodiment of the present application can monitor the air quality inside and outside the vehicle in real time, select the current gas circulation mode of the vehicle, and purify the air inside the vehicle through the air purification module, thereby improving the riding experience of the passengers and maintaining the health of the passengers.

[0081] In an optional implementation, determining the vehicle gas circulation mode based on the gas parameters and controlling the air purification module to act includes: if the gas parameter inside the vehicle is greater than a first threshold, stopping the external circulation and controlling the air purification module to act to discharge the gas inside the vehicle.

[0082] Specifically, when the gas parameter inside the vehicle is greater than the first threshold, the first threshold is the concentration interval of CO2, PM2.5, CO, formaldehyde, toluene, TVOC and H2S gas. For example, in the embodiment of the present application, the interval is CO2 threshold 600-1000 ppm, PM2.5 threshold 25-75 μg / m 3 , CO threshold 5-15 ppm, formaldehyde threshold 0.05-0.1 mg / m 3 , toluene threshold 0.3-0.8 mg / m 3 , TVOC threshold 1-5 mg / m 3 , H2S threshold 0.01-0.03 mg / m 3greater than the first threshold interval, greater than any threshold value in the interval can be considered greater than the first threshold value, and the specific value can be selected according to the configuration of the vehicle, such as a CO2 threshold value of 600-1000 ppm, when the CO2 threshold value is greater than 600, the vehicle interior gas parameter can be considered greater than the first threshold value, and when the CO2 threshold value is greater than 1000, the vehicle interior gas parameter can also be considered greater than the first threshold value. Understandably, the smaller the threshold value, the more stringent the requirement for air quality, and the larger the threshold value, the more relaxed the requirement for air quality, which can be selected according to the configuration of the vehicle. At this time, the external circulation is stopped, and the air purification module is controlled to act, where the air purification module refers to the action of the vehicle window and the air conditioner of the action module, and the vehicle window is lowered and the air conditioner is turned on to discharge the vehicle interior gas. Understandably, at this time, the vehicle interior air quality is poor, and the vehicle interior gas is discharged from the vehicle like human "exhalation", and the vehicle interior air is purified.

[0083] Therefore, when the vehicle interior air quality is poor, the vehicle interior gas is discharged from the vehicle, and at this time, regardless of the external air quality, no air exchange is performed, which ensures that the poor quality air can be discharged from the vehicle in time, and the purification of the vehicle interior air is realized.

[0084] In an optional embodiment, after the vehicle interior gas is discharged, the air purification method further comprises: when the vehicle interior gas parameter is less than the first threshold value, determining the vehicle exterior gas parameter; if the vehicle exterior gas parameter is greater than the first threshold value, the vehicle executes the first control strategy; if the vehicle exterior gas parameter is less than the first threshold value, the vehicle executes the second control strategy.

[0085] Specifically, after the vehicle interior gas is discharged, when the vehicle interior gas parameter is less than the first threshold value, the vehicle interior air quality is good at this time, and there is no need to discharge the gas, and the next control strategy is selected according to the vehicle exterior gas parameter at this time.

[0086] For example, when the vehicle exterior gas parameter is greater than the second threshold value, the value range of the second threshold value can be the same as that of the first threshold value, but the specific value can be different, such as a CO2 first threshold value of 700, and a CO2 second threshold value of 700, 600, 800, 900, etc. The value of the second threshold value only needs to fall within the value range of the first threshold value, at this time, the vehicle exterior air quality is poor, and the vehicle executes the first control strategy. It should be noted that CO2 is only an example here, and other gases also need to reach the threshold value.

[0087] Further, the first control strategy is to control the vehicle to enter an internal circulation mode, and the action unit is in action, and the sterilization unit is turned on. The action unit in action refers to that the vehicle window is closed, and the air conditioner is turned on. At this time, the vehicle internal gas is not discharged to the outside, but only circulates in the vehicle. The sterilization unit purifies the air in the vehicle, so as to improve the air quality in the vehicle. In another example, when the vehicle external gas parameter is less than a second threshold value, the second threshold value and the first threshold value can have the same value range, but the specific value can be different. For example, the CO2 first threshold value is 700, and the CO2 second threshold value can be 700, 600, 800, 900, etc. The value of the second threshold value only needs to fall within the value range of the first threshold value. At this time, it is indicated that the air quality outside the vehicle is good, and the vehicle executes the second control strategy. It should be noted that CO2 is only used as an example here, and other gases also need to reach the threshold value.

[0088] Further, the second control strategy is to control the vehicle to enter an external circulation mode, and the action unit is in action. The action unit in action refers to that the vehicle window is closed, and the air conditioner is turned off. At this time, the vehicle exchanges with the external air to purify the internal air. Therefore, the air quality inside and outside the vehicle is dynamically monitored, the purification strategy is intelligently switched based on the air quality in the vehicle, the detection of multiple gas parameters and the threshold value are supported, different scene requirements are adapted to, the external air pollution is accurately isolated, the air in the vehicle is actively purified, the health risk is reduced, and the driving and riding comfort is enhanced.

[0089] The third aspect of the present application discloses a non-woven fabric, which is applied to the air purification system of the first aspect of the present application and / or the air purification method of the second aspect of the present application. The non-woven fabric comprises a polymer matrix and chitosan quaternary ammonium salt.

[0090] Specifically, the polymer matrix forms a porous network through physical or chemical cross-linking, provides a large number of adsorption sites, and has a high specific surface area to enhance the physical adsorption capacity of gaseous pollutants (such as H2S, NOx, and SO2). At the same time, the polymer matrix provides support for the loading of chitosan quaternary ammonium salt. In addition, the polymer matrix generally has the characteristics of acid and alkali resistance and oxidation resistance, which can prolong the service life of the non-woven fabric in a complex chemical environment and avoid material failure caused by pollution corrosion. Chitosan itself contains amino groups, and after quaternization, positively charged quaternary ammonium groups are introduced. These positive charges can electrostatically attract negatively charged particulate matters (such as PM2.5, bacteria, and viruses) in the air, thereby improving the capture efficiency. In addition, chitosan is derived from natural crustaceans and is biodegradable. If the polymer matrix is made of degradable material, the secondary pollution to the environment can be reduced.

[0091] In an optional embodiment, the chitosan quaternary ammonium salt is prepared by the following method:

[0092] (1) Preparation of chitosan solution: 1 g of chitosan was dissolved in 24 mL of deionized water, followed by the addition of 180 μL of glacial acetic acid solution with a concentration of 1 mol / L, and continuous stirring at room temperature for 3 h until the chitosan was completely dissolved to form a viscous solution;

[0093] (2) Quaternary ammonium reaction: 1546 μL of glycidyltrimethylammonium chloride was slowly added to the above chitosan solution, and continuous stirring and heating to 55°C were performed for 18 h at 55°C, while maintaining continuous stirring to ensure uniformity of the reaction; and pre-cooling treatment was performed, i.e., a mixed solution of acetone / anhydrous ethanol (1:1) was pre-cooled at -70°C for 12 h for use.

[0094] (3) Precipitation and separation: after the reaction was completed, the reaction solution was cooled to room temperature, and centrifugal treatment (4500 rpm, 20 min) was performed to collect the supernatant;

[0095] (4) Product precipitation: the collected supernatant was slowly added dropwise to the pre-cooled acetone / anhydrous ethanol (1:1) mixed solution, and continuous stirring was performed to form a flocculent chitosan quaternary ammonium salt;

[0096] (5) Drying and pulverization: after the flocculent chitosan quaternary ammonium salt was collected, it was dried under vacuum for 48 h to obtain a dried chitosan quaternary ammonium salt product; then the dried product was placed in a wall-breaking machine for dry powder grinding to obtain a chitosan quaternary ammonium salt powder.

[0097] In an alternative embodiment, the mass ratio of the polymer matrix and the chitosan quaternary ammonium salt is (7-9):(1-3) based on the total mass of the non-woven fabric.

[0098] Specifically, the mass ratio of the polymer matrix and the chitosan quaternary ammonium salt can be 7:3, 8:2, or 9:1.

[0099] In Example 1, the mass ratio of the chitosan quaternary ammonium salt is 10%, and the polymer matrix accounts for 90%, which significantly enhances the structural strength and moisture resistance of the non-woven fabric, and is suitable for long-term use. Based on the need for long-term use of the non-woven fabric on vehicles, the service life is a key performance indicator, and therefore, this embodiment is the preferred embodiment of the present application.

[0100] In Example 2, the mass ratio of the chitosan quaternary ammonium salt is 20%, and the polymer matrix accounts for 80% while maintaining a high adsorption capacity, which enhances the mechanical strength and stability of the material, and the ratio of the chitosan quaternary ammonium salt to the polymer matrix is more easily uniformly dispersed through physical mixing or chemical cross-linking, and both adsorption efficiency and durability are considered.

[0101] In Example 3, the mass ratio of the chitosan quaternary ammonium salt is 30%, the chitosan quaternary ammonium salt has the highest content, provides the most active groups and specific surface area, and has the strongest adsorption / inhibition capacity for particulate matter, acid gas and microorganisms, but the mass ratio of the polymer matrix is low and the strength of the non-woven fabric structure is low at this mass ratio.

[0102] Optionally, the polymer matrix comprises any one of polypropylene, polyethylene, polyamide, polyester, polyurethane, polyvinyl alcohol and polylactic acid.

[0103] The selection of polypropylene, polyethylene, polyamide, polyester, polyurethane, polyvinyl alcohol and polylactic acid as the polymer matrix is based on a comprehensive consideration of their chemical stability, functional synergy, environmental protection and process feasibility. These materials can not only provide a stable loading matrix for chitosan quaternary ammonium salt, but also optimize the performance of the air purification system through their own characteristics (such as hydrophobicity, elasticity, biodegradability). By blending, crosslinking or surface modification, the adsorption efficiency, mechanical strength and environmental friendliness of the materials can be further balanced to meet the needs of different application scenarios.

[0104] The fourth aspect of the present application discloses a method for preparing a non-woven fabric, comprising mixing a raw material system comprising a mixed polymer matrix and chitosan quaternary ammonium salt, and then obtaining a non-woven fabric through melt extrusion, melt spraying, cooling reception and hot pressing.

[0105] Specifically, melt extrusion: melt extruding the raw material particles into fibers; melt blowing: forming a fiber web through a melt blowing process; cooling reception: cooling and receiving the fiber web into a nascent non-woven fabric; hot pressing: hot pressing and setting the nascent non-woven fabric to obtain a non-woven fabric with antibacterial activity.

[0106] In an optional embodiment, the temperature for melt extrusion is 180-220℃; and / or the fiber ejection speed controlled by the melt blowing process is 10-20m / s; and / or the cooling reception temperature is 20-30℃; and / or the hot pressing temperature is 120-150℃ and the time is 10-30s.

[0107] Specifically, the hot-pressing temperature needs to be higher than the glass transition temperature of the polymer matrix but lower than its melting point. For example: the Tg of polypropylene (PP) is approximately -10°C, and the melting point is approximately 165°C → the hot-pressing temperature is set to 120-150°C to soften the fibers but not to melt them; the Tg of polyester (PET) is approximately 70°C, and the melting point is approximately 250°C → the hot-pressing temperature needs to avoid the melting point to prevent the fibers from melting, at the same time, a too short hot-pressing time (<10s) can lead to insufficient adhesion, and a too long hot-pressing time (>30s) can cause the fibers to soften excessively or the chitosan quaternary ammonium salt to degrade. The melting temperature determines the melt viscosity, and the viscosity directly affects the fiber stretching capability during melt blowing. For example, a higher melting temperature (220°C) reduces the viscosity, and the melt blowing speed needs to be appropriately increased (20 m / s) to form fine fibers. If the melting temperature is too low (180°C), the melt viscosity is high, and the melt blowing speed needs to be reduced (10 m / s) to avoid fiber breakage. The cooling receiving temperature (20-30°C) needs to be lower than the hot-pressing temperature (120-150°C) to ensure that the fibers can soften and adhere during hot-pressing rather than directly melt and destroy the structure. All parameters (melting temperature, hot-pressing temperature, and cooling temperature) need to avoid the thermal degradation threshold of the chitosan quaternary ammonium salt (usually >220°C) to ensure that the quaternary ammonium groups remain active.

[0108] Therefore, the preparation method of the present application can retain the antibacterial activity of the chitosan quaternary ammonium salt, improve the stability thereof through physical adhesion, ensure the material performance, and reduce energy consumption and production cost.

[0109] According to a fifth aspect of the present application, the embodiments of the present application further provide a controller, comprising a memory and a processor, the memory having a computer program stored thereon; the processor is configured to execute the computer program stored in the memory to implement the steps of the air purification method. The controller has all the beneficial effects of the air purification method, which will not be repeated here.

[0110] According to a sixth aspect of the present application, the embodiments of the present application further provide a computer readable storage medium having a computer program or instructions stored thereon, the program being executed by a processor to implement the steps of the air purification method. The computer readable storage medium has all the beneficial effects of the air purification method, which will not be repeated here.

[0111] According to a seventh aspect of the present application, the embodiments of the present application further provide a vehicle comprising the air purification system and / or the controller and / or the computer readable storage medium. The vehicle has all the beneficial effects, which will not be repeated here.

[0112] According to an eighth aspect of the present application, the embodiments of the present application further provide a computer program product comprising a computer program, the computer program being executed by a processor to implement the air purification method and have all the beneficial effects of the air purification method, which will not be repeated here.

[0113] The embodiments of the present application are described in detail below.

[0114] Example 1

[0115] (1) Preparation of antibacterial non-woven fabric raw material: The previously prepared chitosan quaternary ammonium salt powder is mixed with polypropylene non-woven fabric raw material at a mass ratio of 1:9 to prepare non-woven fabric raw material particles with inherent antibacterial activity. During the mixing process, sufficient stirring is required to ensure uniform dispersion of the chitosan quaternary ammonium salt in the non-woven fabric raw material.

[0116] (2) Non-woven fabric preparation: The prepared antibacterial non-woven fabric raw material particles are sequentially subjected to the following process steps:

[0117] (a) Melt extrusion: The raw material particles are melt extruded into fibers; (b) Melt blowing: The melt fibers are formed into a fiber web through a melt blowing process; (c) Cooling and receiving: The fiber web is cooled and received into a nascent non-woven fabric; (d) Heat pressing and shaping: The nascent non-woven fabric is subjected to heat pressing and shaping treatment, and finally an antibacterial non-woven fabric is obtained, named non-woven fabric A.

[0118] (3) Antibacterial mechanism: The surface of non-woven fabric A carries positive charges, when it contacts with the negatively charged bacterial cell membrane, it can destroy the structure of bacterial cell membrane through electrostatic interaction, leading to the leakage of bacterial content, thus achieving sterilization.

[0119] Note: In step (2), the melt extrusion temperature is 180-220°C, the melt blowing process controls the fiber jet speed to be 10-20 m / s, the cooling and receiving temperature is 20-30°C, the heat pressing and shaping temperature is 120-150°C, and the time is 10-30 s.

[0120] Example 2

[0121] (1) Preparation of antibacterial non-woven fabric raw material: The previously prepared chitosan quaternary ammonium salt powder is mixed with polypropylene non-woven fabric raw material at a mass ratio of 3:7 to prepare non-woven fabric raw material particles with enhanced antibacterial activity. During the mixing process, sufficient stirring is required to ensure uniform dispersion of the chitosan quaternary ammonium salt in the non-woven fabric raw material.

[0122] (2) Non-woven fabric preparation process is the same as step (2) of Example 1, and finally an antibacterial non-woven fabric with enhanced antibacterial activity is obtained, named non-woven fabric B.

[0123] (3) Mechanism of enhancing antibacterial activity: Compared with Example 5, Example 6 increases the proportion of chitosan quaternary ammonium salt powder, which increases the content of positive ions in the antibacterial unit, making it more effective in destroying the bacterial cell membrane, thereby improving the antibacterial activity and sterilization efficiency.

[0124] Verification

[0125] The antibacterial activity of the prepared antibacterial unit was verified, as follows:

[0126] The antibacterial properties of the antibacterial unit (non-woven fabric A, non-woven fabric B) were tested by selecting representative gram-positive bacteria - Staphylococcus aureus and gram-positive bacteria - Escherichia coli as test strains. Non-woven fabric without chitosan quaternary ammonium salt was selected as the control group, and phosphate buffer (PBS) group was selected as the blank control.

[0127] As shown in Figure 5 and Figure 6 After 4h of bacterial contact, the control group had a bactericidal rate of 8% and 6% for Staphylococcus aureus and Escherichia coli, respectively, mainly because the control group was a porous structure that could not completely resuspend the bacteria, resulting in a small amount of bacteria hiding in the non-woven fabric. In the antibacterial unit, the bactericidal rates of non-woven fabric A for Staphylococcus aureus and Escherichia coli were 71% and 84%, respectively, and the bactericidal rates of non-woven fabric B for Staphylococcus aureus and Escherichia coli were 84% and 93%, respectively.

[0128] The above experimental results show that the prepared antibacterial unit (non-woven fabric A, non-woven fabric B) has antibacterial activity and can effectively kill gram-positive bacteria and gram-negative bacteria. At the same time, by adjusting the content ratio of chitosan quaternary ammonium salt in the antibacterial unit (as shown in Example 5 and Example 6), the antibacterial performance of the antibacterial unit can be effectively controlled, thereby realizing the adaptive optimization for different application scenarios.

[0129] Note: The present application verifies the antibacterial activity of the antibacterial unit by implementing the contact antibacterial method. The experimental process is as follows:

[0130] (a) Non-woven fabric A and non-woven fabric B were used as experimental groups, and non-woven fabric without chitosan quaternary ammonium salt was used as a control group; (b) The above three materials were pre-sterilized by high-pressure steam sterilization; (c) The bacterial suspension was prepared according to the standard method, and the concentration was 1×10^6 CFU / mL; (d) The bacterial suspension with a concentration of 1×10^6 CFU / mL was inoculated onto the surface of the material at a volume of 10 μL; (e) The bacteria-inoculated material was incubated in a 37℃, 90% humidity incubator for 4h; (f) After incubation, 990 μL of sterilized PBS solution was added for resuspension; (g) The bacterial resuspension was diluted to 1×10^3 CFU / mL, and after resuspension, 10 μL of bacterial resuspension was taken and added to the beef extract peptone bacterial culture medium (solid); (h) The culture dish inoculated with bacterial resuspension was incubated in a 37℃, 90% humidity incubator for 18h, and then the bactericidal rate was calculated. The bactericidal rate calculation formula is as follows: Bactericidal rate % = (PBS group bacterial colony number - experimental / blank group bacterial colony number) * 100 / PBS group bacterial colony number.

[0131] In the description of the application, reference has been made to descriptive terms such as "one embodiment", "some embodiments", "an embodiment", "exemplary embodiment", "specific example", or "some examples" etc. It is emphasized that these terms are not intended to mean that a particular feature, structure, material or characteristic is required to be included in at least one embodiment of the application. Rather, such terms are intended to convey that a particular feature, structure, material or characteristic is included in at least one embodiment of the application.

[0132] Although embodiments of the present application have been shown and described, it would be appreciated by those skilled in the art that changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. An air purification system applied to a vehicle, characterized in that, The system includes: A sensing module, which is used to acquire gas parameters inside and outside the vehicle; An air purification module, wherein the air purification module is used to purify the air inside the vehicle; A control module is provided, which controls the purification module to purify the air inside the vehicle based on the gas parameters obtained by the sensing module.

2. The system according to claim 1, characterized in that, The air purification module includes a sterilization module and an action module.

3. The system according to claim 2, characterized in that, The sterilization module includes: Filter unit, used to filter particulate matter in the air; Adsorption unit, used to adsorb odors and volatile organic compounds; The catalytic decomposition unit is used to decompose adsorbed volatile organic compounds into water and carbon dioxide; An antibacterial unit is used to eliminate at least a portion of the bacteria in the air inside the vehicle.

4. The system according to claim 3, characterized in that, The antibacterial unit includes a nonwoven fabric, which comprises a polymer matrix and a chitosan quaternary ammonium salt.

5. The system according to claim 3, characterized in that, The sterilization module also includes a dust removal unit, which is used to further filter particulate matter in the air.

6. The system according to claim 2, characterized in that, The action module includes at least the car window and the air conditioner.

7. The air purification system according to claim 1, characterized in that, The sensing module includes: The vehicle includes an in-vehicle sensing module and an external sensing module. The in-vehicle sensing module is used to acquire the gas parameters inside the vehicle, and the external sensing module is used to acquire the gas parameters outside the vehicle.

8. The system according to claim 1, characterized in that, The control module includes: The acquisition unit is used to receive gas parameter information acquired by the sensing module and status information of the air purification module; The analysis unit is used to receive information output by the acquisition unit and determine the current air quality based on a preset algorithm model; The control unit is used to receive the air quality output from the analysis unit and send control signals to the air purification module.

9. The air purification system according to any one of claims 1 to 7, characterized in that, The sensing module includes at least one of the following sensors: (a) CO2 sensor: used to acquire CO2; (b) Particulate matter sensor: used to acquire PM2.5; (c) CO sensor: used to acquire CO; (d) Aldehyde sensor: mainly formaldehyde sensor, used to acquire formaldehyde; (e) Benzene sensor: mainly toluene sensor, used to acquire toluene; (f) TVOC sensor: used to acquire total volatile organic compounds; (g) H2S sensor: used to acquire H2S gas.

10. An air purification method applied to a vehicle, characterized in that, The method includes: Obtain the gas parameters inside and outside the vehicle; Based on the gas parameters, the vehicle gas circulation mode is determined, and the air purification module is controlled to purify the air inside the vehicle. The air purification module includes a sterilization unit and an action unit, and the vehicle gas circulation mode includes external circulation and internal circulation.

11. The method according to claim 10, characterized in that, Based on the gas parameters, determining the vehicle's gas recirculation mode and controlling the air purification module's operation includes: If the gas parameters inside the vehicle exceed a first threshold, the external air circulation mode is stopped, the windows are lowered, and the air conditioning is turned on to expel the gas from inside the vehicle.

12. The method according to claim 11, characterized in that, After the gas inside the vehicle is discharged, the method further includes: When the gas parameters inside the vehicle are less than a first threshold, the gas parameters outside the vehicle are determined. If the external gas parameters of the vehicle are greater than the second threshold, the vehicle executes the first control strategy; If the external gas parameters of the vehicle are less than the second threshold, the vehicle executes the second control strategy.

13. The method according to claim 12, characterized in that, The first control strategy includes: The vehicle is controlled to enter the internal circulation mode, and the action unit is activated to turn on the sterilization unit.

14. The method according to claim 12, characterized in that, The second control strategy includes: The vehicle is controlled to enter the external circulation mode, and the action unit is activated.

15. A nonwoven fabric, applied to the air purification system of claims 1-8 or the air purification method of claims 10-13, characterized in that, The nonwoven fabric comprises a polymer matrix and a chitosan quaternary ammonium salt.

16. The nonwoven fabric according to claim 14, characterized in that, Based on the total mass of the nonwoven fabric, the mass ratio of the polymer matrix to the chitosan quaternary ammonium salt is (7-9):(1-3).

17. The nonwoven fabric according to claim 14, characterized in that, The polymer matrix includes any one of polypropylene, polyethylene, polyamide, polyester, polyurethane, polyvinyl alcohol, and polylactic acid.

18. A method for preparing a nonwoven fabric, characterized in that, include: The nonwoven fabric is obtained by mixing a raw material system including a mixed polymer matrix and chitosan quaternary ammonium salt, followed by melt extrusion, spraying, cooling and receiving, and hot pressing.

19. The preparation method according to claim 17, characterized in that, The temperature of the melt extrusion is 180-220℃; and / or the fiber spraying speed of the meltblown process is controlled at 10-20m / s; and / or the cooling receiving temperature is 20-30℃; and / or the hot pressing and shaping temperature is 120-150℃, and the time is 10-30s.

20. A controller, characterized in that, It includes a memory and a processor, wherein a computer program is stored in the memory; the processor is used to execute the computer program in the memory to implement the method described in claims 10-12.

21. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, When the computer program instructions are executed by the processor, they implement the method described in any one of claims 10-12.

22. A vehicle, characterized in that, Includes the air purification system of claims 1-9 and / or the controller of claim 20 and / or the computer-readable storage medium of claim 21.

23. A computer program product comprising a computer program that, when executed by a processor, implements the air purification method as described in claims 10-21.

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