The subject matter in general relates to a system and method for air
purification within vehicle cabin. More particularly, but not exclusively, the subject matter relates to purifying the air within the vehicle cabin depending on the impurities present in the cabin air.
BACKGROUND
[002] Background description includes information that may be useful in
understanding the present subject matter. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed subject matter, or that any publication specifically or implicitly referenced is prior art.
[003] Air purification within the vehicle cabin is essential in order to keep the
air quality level in safe zone. In order to achieve this, various filter media are used in the path of fresh air or the recirculated air. In big cars, there is enough space available for accommodating multiple filters. However, the same is not true in compact cars where there is space constraint to accommodate multiple filters.
[004] One of the existing technologies use two parallel layout filter to increase
the life of the filters. By using the two parallel layout filter, the space required is huge, which is not possible in compact cars. Another existing technology uses a series layout of the filtration in the air path, which filters air from the impurities and improves the air quality within the vehicle cabin. However, in this type of arrangement, the air passes through all the filters irrespective of the quality of air, thereby reducing the life of the filters.
[005] Thus, there is a need for an air purification system which can be
accommodated irrespective of space constraint and also enhances life of filters.
OBJECTS OF THE DISCLOSURE
[006] In view of the foregoing limitations inherent in the state of the art, some

of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed herein below.
[007] It is an obj ect of the present disclosure to provide a system for purifying
air within vehicle cabin.
[008] It is another obj ect of the present disclosure to deploy an air purification
system in compact vehicles overcoming the space constraint.
[009] It is yet another object of the present disclosure to provide an air
purification system that automatically selects the filter depending upon the type of impurity.
[0010] It is still yet another object of the present disclosure to provide an air purification system that improves the life of the filters.
[0011] These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present invention is illustrated.
SUMMARY
[0012] This summary is provided to introduce concepts related to purifying air within vehicle cabin based on the type of impurities. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0013] In an embodiment, the present invention discloses a system for purifying air within vehicle cabin. The system comprises an air duct, a plurality of sensors and an actuator mechanism. The air duct comprises a fresh air intake port and a recirculation air intake port. The plurality of sensors are configured to sense air quality within the vehicle cabin. The plurality of filters are configured to be

engaged and disengaged between the fresh air intake port and the recirculation air intake port. The actuator mechanism actuates the engagement and disengagement of the plurality of filters between the fresh air intake port and the recirculation air intake port.
[0014] In the above embodiment, the plurality of filters includes a primary filter, a secondary filter, and a tertiary filter. The plurality of filters are disposed within the air duct.
[0015] In the above embodiment, the primary filter is configured to filter larger sized particles from air.
[0016] In the above embodiment, the secondary filter is configured to filter fine particles with size PM2.5 or less from air.
[0017] In the above embodiment, the tertiary filter comprises activated carbon configured to filter odor from air.
[0018] In the above embodiment, the fresh air intake port is configured to receive fresh air and the recirculation air intake port is configured to receive air recirculated from within the vehicle cabin.
[0019] In the above embodiment, the plurality of sensors includes a PM2.5 sensor and an odor sensor.
[0020] In the above embodiment, the actuator mechanism comprises a servo motor and a cam in contact with the servo motor. The plurality of filters are in contact with the cam.
[0021] In the above embodiment, the servo motor engages and disengages the primary filter between the fresh air intake port and the recirculation air intake port depending on the port where the air is coming from.
[0022] In the above embodiment, the servo motor engages and disengages the secondary filter between the fresh air intake port and the recirculation air intake

port using the cam when the PM2.5 sensor detects that the value of PM2.5 in the air inside the vehicle cabin exceeds a first threshold value.
[0023] In the above embodiment, the servo motor engages and disengages the tertiary filter between the fresh air intake port and the recirculation air intake port using the cam when the odor sensor detects that the value of odor in the air inside the vehicle cabin exceeds a second threshold value.
[0024] In another embodiment, the present invention discloses a method for purifying air within vehicle cabin. The method comprising the steps of receiving air using an air duct. The air duct comprises a fresh air intake port and a recirculation air intake port. The method further comprises the step of sensing air quality within vehicle cabin using a plurality of sensors. The method further comprises the step of engaging and disengaging a plurality of filters between the fresh air intake port and the recirculation air intake port using an actuator mechanism,
[0025] In the above embodiment, the plurality of sensors includes a PM2.5 sensor and an odor sensor.
[0026] In the above embodiment, the method further comprises the step of receiving fresh air using the fresh air intake port and receiving air recirculated from within the vehicle cabin using the recirculation air intake port.
[0027] In the above embodiment, the method further comprises the step of filtering larger sized particles from air using a primary filter. Additionally, a secondary filter is used to filter particles with size PM2.5 or less. Odor from air is filtered using a tertiary filter. The plurality of filters includes the primary filter, the secondary filter and the tertiary filter. The tertiary filter comprises activated carbon.
[0028] In the above embodiment, the method further comprises the step of engaging and disengaging the primary filter between the fresh air intake port and the recirculation air intake port depending on the port where the air is coming from using a cam. The method further comprises the step of engaging and disengaging,

using the cam, the secondary filter between the fresh air intake port and the recirculation air intake port when the PM2.5 sensor detects that the value of PM2.5 in the air inside the vehicle cabin exceeds a first threshold value. The method further comprises the step of engaging and disengaging the tertiary filter, using the cam, between the fresh air intake port and the recirculation air intake port when the odor sensor detects that the value of odor in the air inside the vehicle cabin exceeds a second threshold value.
[0029] Other objects, features and advantages of the present disclosure will become apparent from the following detailed description. It should be understood, however, that the detailed description and the specific examples, while indicating specific embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF DRAWINGS
[0030] While the specification concludes with claims particularly pointing out and distinctly claiming the subject matter that is regarded as forming the present subject matter, it is believed that the present disclosure will be better understood from the following description taken in conjunction with the accompanying drawings, where like reference numerals designate like structural and other elements, in which:
[0031] FIG. 1 discloses a system for purifying air within vehicle cabin;
[0032] FIG. 2 discloses the system with its primary filter engaged to a fresh air intake port of an air duct;
[0033] FIG. 3 discloses the system with its primary filter engaged to a recirculation air intake port of the air duct;
[0034] FIG. 4 discloses the system with its primary filter and secondary filter engaged to the fresh air intake port of the air duct;

[0035] FIG. 5 discloses the system with its primary filter and secondary filter engaged to the recirculation air intake port of the air duct;
[0036] FIG. 6 discloses the system with its primary filter, secondary filter and tertiary filter engaged to the fresh air intake port of the air duct;
[0037] FIG. 7 discloses the system with its primary filter, secondary filter and tertiary filter engaged to the recirculation air intake port of the air duct;
[0038] FIG. 8 discloses a flowchart describing a method for purifying air within the vehicle cabin; and
[0039] FIG. 9 discloses a table showing the engagement and disengagement of the filters based on air quality inside vehicle cabin.
[0040] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION
[0041] The detailed description of various exemplary embodiments of the disclosure is described herein with reference to the accompanying drawings. It should be noted that the embodiments are described herein in such details as to clearly communicate the disclosure. However, the amount of details provided herein is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0042] It is also to be understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of

the present disclosure. Moreover, all statements herein reciting principles, aspects, and embodiments of the present disclosure, as well as specific examples, are intended to encompass equivalents thereof.
[0043] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes", "consisting" and/or "including" when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
[0044] It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
[0045] In addition, the descriptions of "first", "second", "third", and the like in the present invention are used for the purpose of description only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include at least one of the features, either explicitly or implicitly.
[0046] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0047] Referring to FIG. 1, disclosed is a system 100 for purifying air within vehicle cabin. The system 100 comprises an air duct 102, a plurality of sensors (not shown in figures), a primary filter 108, a secondary filter 110, a tertiary filter 112, and an actuator mechanism. The plurality of sensors can be placed at any location inside the vehicle cabin. The plurality of sensors includes a PM2.5 sensor and an odor sensor.
[0048] The air duct 102 comprises a fresh air intake port 116 and a recirculation air intake port 114. The fresh air intake port 116 is configured to receive fresh air from outside of a vehicle. The recirculation air intake port 114 is configured to receive air recirculated from within the vehicle cabin. In an embodiment, air is received from either the fresh air intake port 116 or the recirculation air intake port 114.
[0049] The sensors are configured to sense air quality within vehicle cabin. In an embodiment, the sensors may be disposed in a location within the vehicle cabin so as to be able to easily sense the air quality within the vehicle cabin. In an embodiment, the sensors may be configured to detect the type of impurities present in the air.
[0050] The primary filter 108 is configured to be engaged and disengaged between the fresh air intake port 116 and the recirculation air intake port 114 depending on the port 114, 116 from where the air is coming from.
[0051] In an embodiment, the primary filter 108 is always engaged with either of the port 114, 116 irrespective of air quality within the vehicle cabin.
[0052] In an embodiment, the primary filter 108 is configured to filter larger size particles from air. The larger size particles include leaves, coarse particles, pollens, among others.
[0053] The secondary filter 110 is configured to be engaged and disengaged between the fresh air intake port 116 and the recirculation air intake port 114

depending upon the value of PM2.5 in the air detected by the PM2.5 sensor.
[0054] In an embodiment, the secondary filter 110 is configured to filter fine particles from air. The fine particles are particles with size PM2.5 or less. In an embodiment, the PM2.5 sensor may be used to detect the fine particles. In an embodiment, the secondary filter 110 is activated when the PM2.5 value in the air is>= 100 ug/m3.
[0055] The tertiary filter 112 is configured to be engaged and disengaged between the fresh air intake port 116 and the recirculation air intake port 114 depending upon the value of odor in the air detected by the odor sensor.
[0056] In an embodiment, the tertiary filter 112 comprises activated carbon configured to filter odor from air. In an embodiment, total volatile organic compounds (TVOC) sensor, or ammonia sensor may be used to detect the odor in the air. In an embodiment, the tertiary filter 112 is activated when either the TVOC value in the air is >= 1000ug/m3 or the ammonia value in the air is >=25ug/m3.
[0057] In an embodiment, the sensors are configured to detect fine particles and odor in the air received from the fresh air intake port 116 and the recirculation air intake port 114.
[0058] In an embodiment, the actuator mechanism is used to actuate the engagement and disengagement of the filters 108, 110, 112 between the fresh air intake port 116 and the recirculation air intake port 114 depending on the port the air is received from. The actuator mechanism comprises a servo motor 104, and a cam 106 in contact with the servo motor 104. The filters 108, 110, 112 are in contact with the cam 106 so as to be moved between the fresh air intake port 116 and the recirculation air intake port 114. In an embodiment, the cam 106 may operate the filters 108, 110, 112 using the existing pin-slot movement or other existing technologies known to a person skilled in the art.
[0059] Referring to FIG. 2, the servo motor 104 actuates the cam 106 to engage

the required filter 108, 110, 112 with the port from where the air is being received from. In the instant embodiment, the air is received from the fresh air intake port 116. The servo motor 104 actuates the cam 106 to engage the primary filter 108 configured to filter the larger size particles with the fresh air intake port 116 by default irrespective of the air quality inside the vehicle cabin.
[0060] Referring to FIG. 3, the air is received from the recirculation air intake port 114. The servo motor 104 actuates the cam 106 to engage the primary filter 108 configured to filter the larger size particles with the recirculation air intake port 114 by default irrespective of the air quality inside vehicle cabin.
[0061] Referring to FIG. 4, when the PM2.5 sensor detects that the value of PM2.5 in the air inside the cabin exceeds a first threshold value, the PM2.5 sensor sends signal to the servo motor 104. In an example, the first threshold value of PM2.5 is 100 ug/m3. The servo motor 104 then actuates the cam 106 to engage the secondary filter 110 with the port 114, 116 from where the air is being received from. In the instant embodiment, the air is received from the fresh air intake port 116. The servo motor 104 actuates the cam 106 to engage the secondary filter 110 configured to filter particles with size PM2.5 or less with the fresh air intake port 116. The secondary filter 110 is engaged in addition to the primary filter 108 in the fresh air intake port 116.
[0062] Referring to FIG. 5, the air is received from the recirculation air intake port 114. The servo motor 104 actuates the cam 106 to engage the secondary filter 110 configured to filter particles with size PM2.5 or less with the recirculation air intake port 114, when the PM2.5 sensor detects that the value of PM2.5 in the air inside the cabin exceeds a first threshold value. The secondary filter 110 is engaged in addition to the primary filter 108 in the recirculation air intake port 114.
[0063] Referring to FIG. 6, when the odor sensor detects that the value of odor (ammonia or TVOC) in the air inside the cabin exceeds a second threshold value, the odor sensor sends signal to the servo motor 104. In an example, the second threshold value of TVOC is 1000ug/m3 and of ammonia is 25ug/m3. The servo

motor 104 then actuates the cam 106 to engage the tertiary filter 112 with the port 114, 116 from where the air is being received from. In the instant embodiment, the air is received from the fresh air intake port 116. The servo motor 104 actuates the cam 106 to engage the tertiary filter 112 configured to filter odor from the air with the fresh air intake port 116. The tertiary filter 112 is engaged in addition to the primary filter 108 in the fresh air intake port 116. In FIG. 6, although the secondary filter 110 is shown to be engaged with the fresh air intake port 116, if the PM2.5 value in the air is less than the first threshold value, the secondary filter 110 is not engaged and only the primary filter 108 and the tertiary filter 112 are engaged with the fresh air intake port 116.
[0064] Referring to FIG. 7, the air is received from the recirculation air intake port 114. The servo motor 104 actuates the cam 106 to engage the tertiary filter 112 configured to filter odor from the air with the recirculation air intake port 114, when the odor sensor detects that the value of odor (ammonia or TVOC) in the air inside the cabin exceeds a second threshold value. The tertiary filter 112 is engaged in addition to the primary filter 108 in the recirculation air intake port 114. In FIG. 7, although the secondary filter 110 is shown to be engaged with the recirculation air intake port 114, if the PM2.5 value in the air is less than the first threshold value, the secondary filter 110 is not engaged and only the primary filter 108 and the tertiary filter 112 are engaged with the recirculation air intake port 114.
[0065] In an embodiment, the primary filter 108 is always engaged with the port 114, 116 from where the air is being received from, irrespective of the air quality inside the vehicle cabin. The primary filter 108 is engaged with the fresh air intake port 116 if the air is received from vehicle outside and the primary filter 108 is engaged with the recirculation air intake port 114 if the air is received from the vehicle inside. Further, based on the air quality inside the vehicle cabin, either the secondary filter 110 or the tertiary filter 112 or both is activated. The sensors then send the signal to the servo motor 104 to actuate the cam 106 to engage either the secondary filter 110 or the tertiary filter 112 or both with the port 114, 116 from where the air is being received from. Since, the secondary and tertiary filters are

engaged only when required, the unnecessary usage of the filters is prevented which increases life of the filters.
[0066] In an embodiment, if the air is received from vehicle outside, the primary filter 108 is engaged with the fresh air intake port 116 to filter larger sized particles from the fresh air. Thereafter, if the PM 2.5 value in the air inside the vehicle cabin is greater than the first threshold value, the secondary filter 110 is engaged with the fresh air intake port 116, else the secondary filter 110 is not engaged with the fresh air intake port 116. Further, if the odor value in the air inside vehicle cabin is greater than the second threshold value, the tertiary filter 112 is engaged with the fresh air intake port 116, else the tertiary filter 112 is not engaged with the fresh air intake port 116. Thus, the secondary filter 110 or the tertiary filter 112 is engaged with the fresh air intake port 116 only if the corresponding air quality value is beyond the threshold limits. As a result, the unnecessary usage of the filters is prevented which increases life of the filters.
[0067] In an alternate embodiment, if the air is received from vehicle inside, the primary filter 108 is engaged with the recirculation air intake port 114 to filter larger sized particles. Thereafter, if the PM 2.5 value in the air inside vehicle cabin is greater than the first threshold value, the secondary filter 110 is engaged with the recirculation air intake port 114, else the secondary filter 110 is not engaged with the recirculation air intake port 114. Further, if the odor value in the air inside vehicle cabin is greater than the second threshold value, the tertiary filter 112 is engaged with the recirculation air intake port 114, else the tertiary filter 112 is not engaged with the recirculation air intake port 114. Thus, the secondary filter 110 or the tertiary filter 112 is engaged only if corresponding air quality value is beyond the threshold limits. As a result, the unnecessary usage of the filters is prevented which increases life of the filters.
[0068] In an aspect, by the use of specific filters for specific type of impurity in the air inside vehicle cabin, the life of the filters is increased.
[0069] In an aspect, although the secondary filter 110 and the tertiary filter 112

are disclosed to filter PM2.5 particles and odor respectively, it would be obvious for a person skilled in the art to use the filters 110, 112 to filter out other types of impurities depending on the type of impurities present in the air. Further, additional filters may be used to filter additional impurities from the air.
[0070] Referring to FIG. 8, disclosed is a flowchart describing a method for purifying air within the vehicle cabin. At step 802, the system 100 is configured to determine the port 114, 116 from where the air is received from. In an embodiment, an electronic control unit (ECU) of the vehicle may send information to the actuator mechanism regarding the port port 114, 116 from where the air is received from. In an embodiment, the ECU may be part of the system 100. In another embodiment, a dedicated air entry detection sensor or any corresponding technology may be deployed to sense the entry of air through the fresh air intake port 116 and the recirculation air intake port 114. The information may be then relayed to the actuator mechanism.
[0071] A step 804, the actuator mechanism engages the primary filter 108 with the port 114, 116 from where the air is received from. In an embodiment, if the air is received from the fresh air intake port 116, the actuator mechanism engages the primary filter 108 with the fresh air intake port 116. In another embodiment, if the air is received from the recirculation air intake port 114, the actuator mechanism engages the primary filter 108 with the recirculation air intake port 114. The primary filter 108 is engaged by default with either the fresh air intake port 116 or the secondary air intake port 114 depending on where the air is coming from.
[0072] At step 806, once the primary filter 108 is engaged with the respective port 114, 116, the PM2.5 sensor detects whether the PM2.5 level in the air inside the vehicle cabin exceeds the first threshold value.
[0073] At step 808, if the PM2.5 sensor detects that the PM2.5 level in the air inside the vehicle cabin exceeds the first threshold value, the PM2.5 sensor sends signal to the servo motor 104 to actuate the secondary filter 110. In an example, the first threshold value of PM2.5 is 100 ug/m3.

[0074] If the PM2.5 sensor detects at step 806 that the PM2.5 level in the air inside the vehicle cabin does not exceed the first threshold value, the method 800 continues to detect if the PM2.5 level in the air inside the vehicle cabin exceeds the first threshold value.
[0075] At step 810, the servo motor 104 actuates the cam 106 to engage the secondary filter 110 with the port 114, 116 from where the air is being received from. If at step 802, the system 100 has detected that the air is received from the fresh air intake port 116, the servo motor 104 actuates the cam 106 to engage the secondary filter 110 with the fresh air intake port 116. On the contrary, if the system 100 has detected that the air is received from the recirculation air intake port 114, the servo motor 104 actuates the cam 106 to engage the secondary filter 110 with the recirculation air intake port 114. The secondary filter 110 filter particles with size PM2.5 or less from the air.
[0076] At step 812, the PM2.5 sensor detects whether the PM2.5 level in the air inside the vehicle cabin exceeds the first threshold value. If, at step 812, it is determined that the PM2.5 level in the air inside the vehicle cabin exceeds the first threshold value, the method 800 moves to step 810 to continue to engage the secondary filter 110 with the port 114, 116 from where the air is being received from.
[0077] If, at step 812, it is determined that the PM2.5 level in the air inside the vehicle cabin does not exceed the first threshold value, the method 800 moves to step 814 to disengage the secondary filter 110 from the port 114, 116 from where the air is being received from. The disengagement of the secondary filter 110 is done using the actuator mechanism.
[0078] At step 816, once the primary filter 108 is engaged with the respective port 114, 116, the odor sensor detects whether the value of odor (ammonia or TVOC) in the air inside the cabin exceeds the second threshold value. In an example, the second threshold value of TVOC is 1000ug/m3 and of ammonia is
25ug/m3.

[0079] At step 818, if the odor sensor detects that the value of the odor in the air inside the vehicle cabin exceeds the second threshold value, the odor sensor sends signal to the servo motor 104 to actuate the tertiary filter 112.
[0080] If the odor sensor detects at step 816 that the odor value in the air inside the vehicle cabin does not exceed the second threshold value, the method 800 continues to detect if the odor value in the air inside the vehicle cabin exceeds the second threshold value.
[0081] At step 820, the servo motor 104 actuates the cam 106 to engage the tertiary filter 112 with the port 114, 116 from where the air is being received from. If at step 802, the system 100 has detected that the air is received from the fresh air intake port 116, the servo motor 104 actuates the cam 106 to engage the tertiary filter 112 with the fresh air intake port 116. On the contrary, if the system 100 has detected that the air is received from the recirculation air intake port 114, the servo motor 104 actuates the cam 106 to engage the tertiary filter 112 with the recirculation air intake port 114. The tertiary filter 112 filters the odor from the air.
[0082] At step 824, the odor sensor detects whether the odor value in the air inside the vehicle cabin exceeds the second threshold value. If, at step 824, it is determined that the odor value in the air inside the vehicle cabin exceeds the second threshold value, the method 800 moves to step 820 to continue to engage the tertiary filter 112 with the port 114, 116 from where the air is being received from.
[0083] If, at step 824 , it is determined that the odor value in the air inside the vehicle cabin does not exceed the second threshold value, the method 800 moves to step 826 to disengage the tertiary filter 112 from the port 114, 116 from where the air is being received from. The disengagement of the tertiary filter 112 is done using the actuator mechanism.
[0084] FIG. 9 discloses a table showing the engagement and disengagement of the filters 108, 110, 112. In an embodiment, the servo motor 104 is activated by receiving various voltages for the engagement and disengagement of the filters 108,

110, 112. The voltage received by the servo motor 104 may be from the ECU of the vehicle as part of the system 100, wherein the ECU stores predetermined values corresponding to the parameter values of air quality as sensed by the sensors. Referring to the table in FIG. 9, as an example, the ECU sends IV signal to the servo motor 104, whereby the servo motor 104 is configured to move the cam 106 such that only the primary filter 108 is engaged with the appropriate port 114, 116. The IV value may be stored in the ECU to actuate the primary filter 108 to filter larger size particles such as leaves, coarse particles, pollens, etc. In an aspect, the primary filter 108 is actuated by default with the appropriate port 114, 116 depending on where the air is coming from.
[0085] Similarly, referring back to the table in FIG. 9, the ECU send 2V signal
to the servo motor 104, whereby the servo motor 104 is configured to move the cam 106 such that the secondary filter 110 in addition to the primary filter 108 is engaged with the appropriate port 114, 116. The 2V value may be stored in the ECU against the PM2.5 value of the air inside vehicle cabin. When the PM2.5 level of the air inside vehicle cabin exceeds the first threshold value, the ECU receives input from PM2.5 sensor to move the cam 106 to engage the secondary filter 110. Since, the primary filter 108 is already engaged by default, the air passes through both the primary filter 108 and the secondary filter 110.
[0086] Referring again to the table in FIG. 9, the ECU sends 3V signal to the servo motor 104, whereby the servo motor 104 is configured to move the cam 106 such that the secondary filter 110 and the tertiary filter 112 in addition to the primary filter 108 are engaged with the appropriate port 114, 116. The 3V value may be stored in the ECU against the PM2.5 value and the odor value of the air inside vehicle cabin. When the PM2.5 level and the odor value of the air inside vehicle cabin exceeds the first threshold value and the second threshold value respectively, the ECU receives input from PM2.5 sensor and odor sensor to move the cam 106 to engage the secondary filter 110 and the tertiary filter 112. Since, the primary filter 108 is already engaged by default, the air passes through all the filters 108, 110, 112.

[0087] Referring again to the table in FIG. 9, the ECU sends 4V signal to the servo motor 104, whereby the servo motor 104 is configured to move the cam 106 such that the tertiary filter 112 in addition to the primary filter 108 is engaged with the appropriate port 114, 116. The 4V value may be stored in the ECU against the odor value of the air inside vehicle cabin. When the odor level of the air inside vehicle cabin exceeds the second threshold value, the ECU receives input from odor sensor to move the cam 106 to engage the tertiary filter 112. Since, the primary filter 108 is already engaged by default, the air passes through both the primary filter 108 and the tertiary filter 112. In this case, it is assumed that the PM2.5 level of the air inside vehicle cabin is less than the first threshold value, as a result the secondary filter is not engaged with the port 114, 116.
TECHNICAL ADVANTAGE
[0088] The present disclosure proposes a system for purifying air within vehicle cabin.
[0089] The present disclosure proposes to deploy air purification system in compact vehicles overcoming the space constraint.
[0090] The present disclosure proposes to provide an air purification system that automatically selects the filter depending upon the type and level of impurity.
[0091] The present disclosure proposes to provide an air purification system that improves the life of the filters.
[0092] Furthermore, each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.

[0093] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.
[0094] Furthermore, those skilled in the art can appreciate that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[0095] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
[0096] While the foregoing describes various embodiments of the present disclosure, other and further embodiments of the present disclosure may be devised without departing from the basic scope thereof. The scope of the present disclosure is determined by the claims that follow. The present disclosure is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

[0097] The term "automobile" or "vehicle" as used throughout this detailed description and in the claims refers to any moving automobile or vehicle that is capable of carrying one or more human occupants and is powered by any form of energy. The term "automobile" or "vehicle" is a motor vehicle which includes, but is not limited to: cars, trucks, vans, minivans, hatchback, sedan, MUVs, and SUVs.

we claim:

1. A system (100) for purifying air within vehicle cabin, the system (100)
comprising:
an air duct (102) comprising a fresh air intake port (116) and a recirculation
air intake port (114);
a plurality of sensors configured to sense air quality within the vehicle cabin;
a plurality of filters (108, 110, 112) configured to be engaged and disengaged
between the fresh air intake port (116) and the recirculation air intake port
(114); and
an actuator mechanism to actuate the engagement and disengagement of the
plurality of filters (108, 110, 112) between the fresh air intake port (116) and
the recirculation air intake port (114).
2. The system (100) as claimed in claim 1, wherein the plurality of filters (108, 110, 112) includes a primary filter (108), a secondary filter (110), and a tertiary filter (112), wherein the plurality of filters (108, 110, 112) are disposed within the air duct (102).
3. The system (100) as claimed in claim 2, wherein the primary filter (108) is configured to filter larger sized particles from air.
4. The system (100) as claimed in claim 2, wherein the secondary filter (110) is configured to filter fine particles with size PM2.5 or less from air.
5. The system (100) as claimed in claim 2, wherein the tertiary filter (112) comprises activated carbon configured to filter odor from air.
6. The system (100) as claimed in claim 1, wherein the plurality of sensors includes a PM2.5 sensor and an odor sensor.

7. The system (100) as claimed in claim 6, wherein the actuator mechanism comprises a servo motor (104) and a cam (106) in contact with the servo motor (104), wherein the plurality of filters (108, 110, 112) are in contact with the cam (106).
8. The system (100) as claimed in claim 7, wherein the servo motor (104) engages and disengages the primary filter (108) between the fresh air intake port (116) and the recirculation air intake port (114) depending on the port (114, 116) where the air is coming from.
9. The system (100) as claimed in claim 7, wherein the servo motor (104) engages and disengages the secondary filter (110) between the fresh air intake port (116) and the recirculation air intake port (114) using the cam (106) when the PM2.5 sensor detects that the value of PM2.5 in the air inside the vehicle cabin exceeds a first threshold value.
10. The system (100) as claimed in claim 7, wherein the servo motor (104) engages and disengages the tertiary filter (112) between the fresh air intake port (116) and the recirculation air intake port (114) using the cam (106) when the odor sensor detects that the value of odor in the air inside the vehicle cabin exceeds a second threshold value.
11. A method (800) for purifying air within vehicle cabin, the method comprising the steps of:
receiving air using an air duct (102), wherein the air duct (102) comprises a fresh air intake port (116) and a recirculation air intake port (114); sensing, using a plurality of sensors, air quality within vehicle cabin; and engaging and disengaging, using an actuator mechanism, a plurality of filters (108, 110, 112) between the fresh air intake port (116) and the recirculation air intake port (114).

12. The method (800) as claimed in claim 11, wherein the plurality of sensors includes a PM2.5 sensor and an odor sensor.
13. The method (800) as claimed in claim 11, comprising the step of filtering larger sized particles from air using a primary filter (108);
filtering particles with size PM2.5 or less using a secondary filter (110); and filtering odor from air using a tertiary filter (112), wherein the plurality of filters includes the primary filter (108), the secondary filter (110) and the tertiary filter (112), wherein the tertiary filter (112) comprises activated carbon.
14. The method (800) as claimed in claim 13, comprising the steps of:
engaging and disengaging the primary filter (108), using a cam (106),
between the fresh air intake port (116) and the recirculation air intake port
(114) depending on the port (114, 116) where the air is coming from;
engaging and disengaging the secondary filter (110), using the cam (106),
between the fresh air intake port (116) and the recirculation air intake port
(114) when the PM2.5 sensor detects that the value of PM2.5 in the air inside
the vehicle cabin exceeds a first threshold value; and
engaging and disengaging the tertiary filter (112), using the cam (106), between the fresh air intake port (116) and the recirculation air intake port (114) when the odor sensor detects that the value of odor in the air inside the vehicle cabin exceeds a second threshold value.