Claims:WE CLAIM:
1. A system 100 for expelling air from a vehicle cabin, the system 100 comprising:
at-least one vent 102 provided in the vehicle cabin, the vent 102 connected with a duct 160 for conveying air from the vehicle cabin;
a flap F provided adjacent to the vent 102, the flap F movable in at-least a first position and a second position, in the first position the flap F blocks airflow through the vent 102, and in the second position the flap F allows airflow through the vent 102;
a motor connected with the flap F to move the flap F between the first position and the second position;
a fan 150 provided in the duct 160; and
a control unit configured to:
operate the motor to move the flap F to the second position; and
operate the fan 150 for a per-determined time period, operation of the fan 150 causes air accumulated in the vehicle cabin to flow out through the duct 160.
2. The system 100 as claimed in claim 1, wherein the motor is a stepper motor.
3. The system 100 as claimed in clam 1, wherein a position sensor is provided to monitor position information of the flap F.
4. The system 100 as claimed in claim 1 or 3, wherein the control unit receives position information of the flap F, and operates the motor depending upon the position information of the flap F.
5. The system 100 as claimed in claim 1, wherein the system 100 comprises a communication module, the communication module allows the system 100 to be operated remotely.
6. The system 100 as claimed in claim 1, wherein the system 100 is adapted to a HVAC system 200 of the vehicle.
, Description:FIELD OF THE INVENTION
[001] The invention relates to a system for expelling air from a vehicle cabin.

BACKGROUND OF THE INVENTION
[002] Vehicles are often parked in open spaces. Due to this, vehicles are exposed to harsh atmospheric conditions, especially high temperatures during summers. Such exposure to high temperatures causes excessive heating of the vehicle body which also leads to an increase in the temperature inside vehicle cabin considerably. Since, the vehicle is locked, and there is minimum ventilation when the vehicle is locked, hot air accumulates inside the vehicle cabin.
[003] The hot air and the increased temperature inside the vehicle cabin causes discomfort to passengers who board the vehicle. It is common for passengers to open windows and doors for removing the hot air. However, it takes some time for the hot air to be removed. Also, opening the windows and doors, exposes the vehicle cabin to the outside atmosphere and/or dust, which is not desirable. Operating the onboard HVAC system also is not effective in the initial period after boarding in the vehicle.
[004] In view of the above, there is a need for an invention which address at-least the aforementioned problems.

SUMMARY OF THE INVENTION
[005] Accordingly, the present invention in one aspect provides a system for expelling air from a vehicle cabin, the system comprising at-least one vent provided in the vehicle cabin, the vent connected with a duct for conveying air from the vehicle cabin; a flap provided adjacent to the vent, the flap movable in at-least a first position and a second position, in the first position the flap blocks airflow through the vent, and in the second position the flap allows airflow through the vent; a motor connected with the flap to move the flap between the first position and the second position; a fan provided in the duct; and a control unit configured to: operate the motor to move the flap to the second position; and operate the fan for a per-determined time period, operation of the fan causes air accumulated in the vehicle cabin to flow out through the duct.
[006] In another aspect, the present invention provides a HVAC system for a vehicle comprising the system for expelling air.

BRIEF DESCRIPTION OF THE DRAWINGS
[007] Reference will be made to embodiments of the invention, examples of which may be illustrated in accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
Figure 1 shows a system for expelling air from a vehicle cabin in accordance with an embodiment of the invention.
Figure 2 shows a HVAC system in accordance with an embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION
[008] The present invention provides a system for expelling air from a vehicle cabin. The system is directed to expel hot air which accumulates in the vehicle cabin when a vehicle is parked outdoors.
[009] Figure 1 shows a system 100 for expelling air from a vehicle cabin. The system 100 comprises at-least one vent 102, a duct 160, a flap F, a fan 150 and a control unit.
[010] One or more vents 102 can be provided inside the vehicle cabin. In this regard, the vents 102 can be provided on an instrument panel or middle/rear row console. Further, each vent 102 is connected with the duct 160 for conveying/directing air outside the vehicle cabin. In an embodiment, at-least one flap F is provided adjacent to the vent 102 to open or close the vent 102. In this regard, the flap F is configured to be in at-least two positions – a first position and a second position. In the first position, the flap F blocks airflow through the vent 102 and in the second position the flap F allows airflow through the vent 102. The flap F is movable between the first position and the second position by a motor. The motor preferably is a stepper motor.
[011] In an embodiment of the invention, the fan 150 is provided in the duct 160. The fan 150 upon operation causes air accumulated in the vehicle cabin to de drawn out from the vehicle cabin through the duct 160, thereby evacuating/expelling hot air accumulated in the cabin.
[012] Further, the control unit is connected with the motor and the fan 150, whereby the control unit is configured to operate the motor to move the flap F to the second position, and operate the fan 150 for a pre-defined time period. As discussed hereinbefore, operation of the fan 150 causes air accumulated in the vehicle cabin to drawn out from the vehicle cabin through the duct 160. The control unit in an embodiment of the invention is an electronic control unit of the vehicle, which is already on board the vehicle. Alternately, control unit can be a dedicated unit installed specifically for the system 100 of the present invention.
[013] In an embodiment of the invention, the system 100 of the present invention can be operated remotely by a user. The system 100 further comprises of a communication module. The communication module allows an electronic device to connect with the system 100 to operate/actuate the system 100 from a remote location. Advantageously, the user can operate the system 100 in advance so that before the user reaches the vehicle, the air accumulated in the cabin is expelled, and overall temperature of the vehicle cabin is reduced. Alternately, the system 100 can be operated/actuated by a switch provided in the vehicle cabin.
[014] Furthermore, the system 100 is connected with a battery unit of the vehicle, whereby the battery unit powers the fan 150 even when the vehicle is not in operating condition. The control unit is configured to check battery unit charging status before operating the fan 150 so as to preserve the battery unit in case state of charge of battery is low.
[015] Furthermore, a position sensor is provided to monitor position information of the flap F. The position information of the flap F is provided to the control unit, and the control unit operates the motor to move the flap depending upon the position information of the flap F.
[016] In an embodiment of the invention, the system of the present invention can be integrated/adapted with existing HVAC system 200 of the vehicle. Figure 2 shows a HVAC system 200 in accordance with an embodiment of the invention.
[017] As is known in the art, the HVAC system 200 comprises a network of ducts and vents for transferring a flow of air in through and out of the vehicle. As shown, the HVAC system 200 comprises of an air filter 210, a heater core 220, an evaporator 230, a cooling blower 240, a fan 250, and a duct network 260. Further, as shown, the system 200 has multiple vents, namely main upper vent 202; defrost vent 204, floor vent 206, and cabin air vent 208 provided on the duct network 260. Further, a first flap F1 is provided adjacent to the defrost vent 204, a second flap F2 is provided adjacent to the floor vent 206, a third flap F3 is provided adjacent to an evaporator drain, and a fourth flap F4 is provided adjacent to a cabin air vent 208. In an embodiment, each flap is movable between the first position and the second position, whereby in the first position, the flap blocks airflow through the vent, and in the second position the flap allows airflow through the vent.
[018] As discussed hereinbefore, the system 200 for expelling air from the vehicle cabin is integrated with the HVAC system 200. Accordingly, the HVAC system 200 can be used in its normal mode or it can be used to expel hot air from the vehicle cabin. For expelling air from the vehicle cabin, shown in figure 1, the control unit closes the defrost vent 204 via the first flap F1, opens the floor vent 206 via the second flap F2, closes evaporator drain via the third flap F3, and opens the cabin air vent 208 via the forth flap F4. Thereafter, the control unit operates the fan 250 for a pre-determined time period. Operation of the fan 250 for the per-determined time period causes air accumulated in the vehicle cabin to flow out through the duct.
[019] Advantageously, the present invention removes hot air accumulated inside a vehicle cabin, thereby obviating the disadvantages associated with vehicles parked in open spaces, especially in high temperature conditions.
[020] While the present invention has been described with respect to certain embodiments, it will be apparent to those skilled in the art that various changes and modification may be made without departing from the scope of the invention as defined in the following claims.