FORM 2
The Patent Act 1970
(39 of 1970)
&
The Patent Rules, 2005
COMPLETE SPECIFICATION (SEE SECTION 10 AND RULE 13)
TITLE OF THE INVENTION
“AN AUXILIARY DEVICE FOR ASSISTING COOLING OF INTERIOR OF A VEHICLE AND METHOD THEREOF”
TATA MOTORS LIMITED
An Indian Company
Bombay House, 24 Homi Mody Street,
Hutatma Chowk, Mumbai 400 001,
Maharashtra, India.
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner
in which it is to be performed.

FIELD OF THE INVENTION [0001] The present disclosure relates to air conditioning system, and more particularly relates to an auxiliary device and method thereof for assisting cooling of an interior of a vehicle.
BACKGROUND
[0002] In hot ambient conditions, when a vehicle is parked under direct sunlight, the vehicle gets soaked. Due to which the roof, trims, dashboard, seats, windscreen, windows, doors and all the surfaces including all the touch points get heated up. Especially when parking for a long time under hot weather, the temperature in the roof compartment, side walls, window, floor etc. approximately to 65 degree centigrade or even more.
[0003] FIG. 1 illustrates a schematic representation of radiation heat transfer received by occupant(s) in a hot soaked vehicle. When occupant(s) enter(s) the soaked vehicle all the heated surfaces start radiating heat to the occupant(s). In the FIG. 1, arrows denote the direction of radiation heat transfer towards the occupant. In such scenario, even though the vehicle is heated by external sources such as solar radiation ambient humidity, for occupant(s) inside the vehicle effectively and typically vehicle roof, side walls, glasses, floor etc. are the sources of heat (heat source) whereas the cooled conditioned air and the occupant(s) are heat sinks (till the temperature of the occupant remains lower than that of the surrounding surfaces).
[0004] Even if the AC is switched on, due to solar radiation the surface exposed to sunlight continue to gain heat due to solar load and continue to radiate heat to occupant(s). Further, even if the radiation

ingress from outside of the car into the cabin is limited, the hot soaked surfaces continue to radiate heat to the occupant till there is a temperature difference between the surfaces and the body of the occupant(s). Radiation heat transfer received from the heated surfaces to occupant(s) deteriorates the thermal comfort inside the vehicle cabin. [0005] Therefore, there is a need to lower the temperature of the interior of the vehicle especially when the passenger enters the vehicle after parking in the hot sun.
OBJECT OF THE INVENTION
[0006] The principal object of the embodiments herein is to provide an auxiliary device and method thereof for assisting cooling of an interior of a vehicle. The auxiliary device includes a radiant cooling panel (RCP) that assists in reducing ingress of heat inside the cabin of the vehicle due to solar radiation, thereby limiting the temperature rise of touch points inside the cabin of the vehicle.
[0007] Another object of the embodiments herein is to provide a RCP positioned on an interior surface of a roof the vehicle to lower the temperature of interior of the vehicle. The RCP includes a plurality of refrigerant lines connected to an air conditioning system and is configured to store refrigerant using the air conditioning system to maintain a predefined temperature by heat exchange between interior of the vehicle and the RCP.
[0008] Yet another object of the embodiments herein is to exchange the heat between the interior of the vehicle and the radiant cooling panel without regulating the refrigerant to maintain the predefined temperature inside the vehicle.

[0009] Still another object of the embodiments herein is to regulate a flow of the refrigerant into the plurality of refrigerant lines using the flow control value to maintain the predefined temperature inside the vehicle.
SUMMARY
[0010] In one aspect object is satisfied by providing an auxiliary device for assisting cooling of interior of a vehicle. The auxiliary device includes a radiant cooling panel (RCP), a thermostatic expansion valve, and a flow control value. The RCP is positioned on an interior surface of a roof the vehicle. The RCP includes a plurality of refrigerant lines connected to an Air Conditioning (AC) system of the vehicle. The thermostatic expansion valve to operate the RCP. The thermostatic expansion valve receives a predetermined portion of refrigerant from a condenser of the AC system. The thermostatic expansion valve expands the refrigerant received from the condenser and make the refrigerant cool, and wherein the refrigerant cooled from the thermostatic expansion valve flows into the refrigerant lines for assisting cooling of interior of the vehicle.
[0011] In an embodiment, maintain the predefined temperature includes determine a temperature of the RCP and determine whether the temperature of the RCP meets the dew point temperature (DPT) criteria. In response to determining that the temperature of the RCP meets the DPT criteria, the thermostatic expansion valve allows exchange of heat between the interior of the vehicle and the RCP without controlling the flow of the refrigerant to maintain the predefined temperature inside the vehicle. In response to determining that the temperature of the RCP does not meets the DPT criteria, the thermostatic expansion valve

controls the flow of the refrigerant into the plurality of refrigerant lines using the flow control value to maintain the predefined temperature inside the vehicle.
[0012] In an embodiment, control the flow of the colorant into the plurality of refrigerant lines using the flow control value to maintain the predefined temperature inside the vehicle includes determine whether the temperature of the RCP meets a minimum DPT threshold or a maximum DPT threshold of the DPT criteria. In response to determining that the minimum DPT threshold of the DPT criteria is not met, the thermostatic expansion valve switches off the flow of the refrigerant using the flow control value to maintain the predefined temperature inside the vehicle. In response to determining that the maximum DPT threshold of the DPT criteria is not met, the thermostatic expansion valve controls the flow of the refrigerant using the flow control value to maintain the predefined temperature inside the vehicle.
[0013] In an embodiment, the minimum DPT threshold is determined by receiving a cabin temperature of the vehicle, determining a DPT inside the vehicle based on the cabin temperature of the vehicle, and determining the minimum DPT threshold based on the DPT and a minimum constant.
[0014] In an embodiment, the maximum DPT threshold is determined by receiving a cabin temperature of the vehicle, determining a DPT inside the vehicle based on the cabin temperature of the vehicle, and determining the maximum DPT threshold based on the DPT and a maximum constant.

[0015] In an embodiment, the plurality of refrigerant lines a refrigerant inlet and a refrigerant outlet connected to the flow control value.
[0016] In another aspect object is satisfied by providing a method for assisting cooling of interior of a vehicle. The method includes detecting a cooling operation by an air conditioning (AC) system in the vehicle, determining a temperature of a RCP connected to the AC system and determining whether the temperature of the RCP meets a dew point temperature (DPT) criteria. In response to determining that the temperature of the RCP meets the DPT criteria, the method includes storing refrigerant using the AC system to maintain a predefined temperature inside the vehicle by exchanging heat between the interior of the vehicle and the RCP. Further, in response to determining that the temperature of the RCP does not meets the DPT criteria, the method includes controlling a flow of the refrigerant into the plurality of refrigerant lines using a flow control value of the RCP to maintain a predefined temperature inside the vehicle.
[0017] In an embodiment, controlling the flow of the refrigerant includes determining whether the temperature of the RCP meets a minimum DPT threshold or a maximum DPT threshold of the DPT criteria. In response to determining that the minimum DPT threshold of the DPT criteria is not met, the method includes switching off the flow of the refrigerant using the flow control value to maintain the predefined temperature inside the vehicle. In response to determining that the maximum DPT threshold of the DPT criteria is not met, the method includes controlling the flow of the refrigerant using the flow control value to maintain the predefined temperature inside the vehicle.

[0018] These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.
BRIEF DESCRIPTION OF FIGURES
[0019] The proposed auxiliary cooling device is illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[0020] FIG. 1 illustrates a schematic representation of radiation heat transfer received by occupant(s) in a hot soaked vehicle, according to prior art;
[0021] FIG. 2 illustrates a schematic representation of radiation heat transfer received by occupant(s) in a hot soaked vehicle, according to embodiments as disclosed herein;
[0022] FIG. 3 illustrates a schematic representation of a top view of the auxiliary device, according to embodiments as disclosed herein;
[0023] FIG. 4 illustrates a schematic representation of a side view of the vehicle with AC system and the proposed auxiliary device, according to embodiments as disclosed herein; and

[0024] FIG. 5 illustrates a method for assisting cooling of interior of a vehicle, according to embodiments as disclosed herein.
[0025] DETAILED DESCRIPTION [0026] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. Also, the various embodiments described herein are not necessarily mutually exclusive, as some embodiments can be combined with one or more other embodiments to form new embodiments. The term “or” as used herein, refers to a non-exclusive or, unless otherwise indicated. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein can be practiced and to further enable those skilled in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0027] The accompanying drawings are used to help easily understand various technical features and it should be understood that the embodiments presented herein are not limited by the accompanying drawings. As such, the present disclosure should be construed to extend to any alterations, equivalents and substitutes in addition to those which are particularly set out in the accompanying drawings. Although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are generally only used to distinguish one element from another.

[0028] Referring now to the drawings, and more particularly to FIGS. 2-5, there are shown preferred embodiments.
[0029] FIG. 2 illustrates a schematic representation of radiation heat transfer received by occupant(s) in a hot soaked vehicle (1), according to embodiments as disclosed herein. An auxiliary device (2) comprising a radiant cooling panel (RCP) (3) is positioned on an interior surface of a roof the vehicle (1). As per the proposed invention, even though the vehicle (1) is heated by external sources such as solar radiation, ambient humidity, etc. Due to the RCP (3) a surface temperature of the roof can be maintained as desired (approximately ~ 25°C or less with proposed radiant cooling panel as opposed to the generally high temperature of ~ 65°C without the radiant cooling panel as shown in the FIG. 1). In the FIG. 2, the arrows denote the direction of radiation heat transfer. Unlike the conventional system the proposed auxiliary device (2) helps in lowering the temperature inside the vehicle (1) by exchanging heat between the air inside the vehicle interior and touch points that is hot due to solar heat and the auxiliary device (2).
[0030] FIG. 3 illustrates a schematic representation of a top view
of the auxiliary device (2), according to embodiments as disclosed herein. The RCP of the auxiliary device (2) includes a plurality of refrigerant lines (4) connected to the air conditioning system of the vehicle (1) and a thermostatic expansion valve (TXV1) (9) to operate the RCP (3). The plurality of refrigerant lines (4) to allow the refrigerant flow in order to reduce or maintain the temperature inside the vehicle. The plurality of refrigerant lines (4) includes a refrigerant inlet (6) and a refrigerant outlet (7) connected to the thermostatic expansion valve (TXV1) (9). An arrangement of the refrigerant lines (4) are placed strategically and internally in the vicinity of roof of the

vehicle (1) to cover the complete roof area internally. These refrigerant lines (4) maintain the roof at a suitably lower temperature.
[0031] This arrangement of the refrigerant lines (4) (or cooling lines) in conjunction with their strategic placement with turn the roof (or it can be any other surface including but not limited to the roof) into a heat sink rather than a heat source (in absence of this auxiliary arrangement human being is the only heat sink) thus significantly reducing the total head load on the occupant and facilitating better occupant thermal comfort (as this proposed radiant panel while acting as heat sink will extract heat extraction by means of radiation heat transfer). In the images accompanying this document the proposed radiant cooling panel working has been described with regards to the cooling being done with refrigerant lines. However, for a person skilled in the art it is apparent that this cooling can also be provided by, including but not limited to, refrigerant/brine lines in case of water cooled or secondary loop cooling system.
[0032] FIG. 4 illustrates a schematic representation of a side view of the vehicle (1) with an AC system (8) and the proposed auxiliary device (2), according to embodiments as disclosed herein. The cooling lines (4) takes the refrigerant from the AC system (8) and send the refrigerant back to the AC system (8) as shown in the FIG. 4. The proposed RCP (3) working has been described with regards to the cooling being done with the cooling lines (4). However, for a person skilled in the art it is apparent that this cooling can also be provided by, including but not limited to, refrigerant/brine lines in case of water cooled or secondary loop cooling system (not shown in the figure).
[0033] A circuit of the proposed auxiliary device (2) is illustrated in the FIG. 4. The auxiliary device (2) includes the plurality of

refrigerant lines (4) connected to a thermostatic expansion valve (TXV1) (9) and the Air AC system (8) of the vehicle (1). The thermostatic expansion valve (9) is connected to the flow control value (5) to operate the RCP (3) and allow the flow of refrigerant in the plurality of refrigerant lines (4). The thermostatic expansion valve (9) controls the flow control value (5) to allow the refrigerant from the AC system (6) to flow through the plurality of refrigerant lines (4) in order to maintain a predefined temperature inside the vehicle (1).
[0034] In an embodiment, the thermostatic expansion valve (9) to operate the RCP (3). The thermostatic expansion valve (9) receives a predetermined portion of refrigerant from a condenser (11) of the AC system (8). The thermostatic expansion valve (9) expands the refrigerant received from the condenser (11) and make the refrigerant cool, and the refrigerant thus cooled from the thermostatic expansion valve (9) flows into the refrigerant lines (4) for assisting cooling of interior of the vehicle (1).
[0035] In order to maintain the predefined temperature, the thermostatic expansion valve (9) determines a temperature of the RCP (3) and determine whether the temperature of the RCP (3) meets the dew point temperature (DPT) criteria. The DPT criteria includes a maximum DPT threshold and a minimum DPT threshold.
[0036] In response to determining that the temperature of the RCP (3) meets the maximum DPT threshold and the minimum DPT threshold, the thermostatic expansion valve (9) allows exchange of heat between the interior of the vehicle (1) and the RCP (3) without controlling the flow of the refrigerant to maintain the predefined temperature inside the vehicle (1). Further, in response to determining that the temperature of the RCP (3) meets the minimum DPT threshold

but not meet the maximum DPT threshold, the thermostatic expansion valve (9) the thermostatic expansion valve (9) switches off the flow of the refrigerant using the flow control value (5) to maintain the predefined temperature inside the vehicle (1). Furthermore, in response to determining that the temperature of the RCP (3) does not meet both the minimum DPT threshold and the maximum DPT threshold, the thermostatic expansion valve (9) controls the flow of the refrigerant using the flow control value (5) to maintain the predefined temperature inside the vehicle (1).
[0037] In an embodiment, the thermostatic expansion valve (9) determines the minimum DPT threshold by receiving a cabin temperature of the vehicle (1), determining a DPT inside the vehicle (1) based on the cabin temperature of the vehicle (1), and determining the minimum DPT threshold based on the DPT and a minimum constant. For example, the minimum constant is a value determined based on…
[0038] In an embodiment, the thermostatic expansion valve (9) determines the maximum DPT threshold is determined by receiving a cabin temperature of the vehicle (1), determining a DPT inside the vehicle (1) based on the cabin temperature of the vehicle (1), and determining the maximum DPT threshold based on the DPT and a maximum constant. For example, the maximum constant is a value determined based on…
[0039] In an embodiment, the thermostatic expansion valve (9) can include, but not limited to, a throttling controller, an orifice tube and or capillary tube.
[0040] A circuit of the AC system (8) is described in the FIG. 4.
The AC system (8) includes, but is not limited to, a compressor (10), a

condenser (11), a thermostatic expansion valve (TXV2) (12) and an evaporator (13).
[0041] FIG. 5 illustrates a method for assisting cooling of interior of the vehicle (1), according to embodiments as disclosed herein. The method is implement by the auxiliary device (2) and the steps are performed by the thermostatic expansion valve (9).
[0042] At step S1, the method includes detecting a cooling operation of the AC system (6) in the vehicle (1). The AC system (6) in the vehicle (1) is generally operated when all the windows of the vehicle (1) is closed. The auxiliary device (2) detects that the cooling operation of the AC system (6) in the vehicle (1) is enabled.
[0043] At step S2, the method includes determining a DPT inside the vehicle (1) based on the cabin temperature of the vehicle (1). The cabin temperature of the vehicle (1) is measured using the temperature sensor of the vehicle (1). The measured cabin temperature is received by the auxiliary device (2) and is used to determine DPT inside the vehicle (1).
[0044] At step S3, the method includes determining a DPT criteria including a minimum DPT threshold and a maximum DPT threshold. The minimum DPT threshold is determined based on the DPT and a minimum constant. For example, the minimum DPT threshold indicates a temperature to which the air must be cooled to become saturated with water vapor. A minimum constant value such as 0.5 is added to the determined DPT of the vehicle (1) to determine the minimum DPT threshold. Similarly, the maximum DPT threshold is determined based on the DPT and a maximum constant. For example, the maximum DPT threshold indicates a temperature at which the airborne water vapor will condense to form liquid water. A maximum constant value such as

3 is added to the determined DPT of the vehicle (1) to determine the maximum DPT threshold.
[0045] At step S4, the method includes determining a temperature of a radiant cooling panel (RCP) (3) (TRCP) connected to the AC system (8). The RCP (3) is positioned on an interior surface of a roof the vehicle (1). This RCP (3) is used to reduce the ingress of heat inside the cabin of the vehicle (1) due to solar radiation, thereby limiting the temperature rise of the touch points inside the cabin of the vehicle (1).
[0046] At step S5, the method includes determining whether the temperature of the RCP (3) meets the minimum DPT threshold of the DPT criteria. For example, the auxiliary device (2) determines whether the TRCP >= 0.5+DPT.
[0047] At step S6, in response to determining that the minimum DPT threshold of the DPT criteria is not met, the method includes switching off the flow of the refrigerant using the flow control value (5) to maintain the predefined temperature inside the vehicle (1).
[0048] At step S7, in response to determining that the minimum DPT threshold of the DPT criteria is met, the method includes determining whether the temperature of the RCP (3) meets the maximum DPT threshold of the DPT criteria. For example, the auxiliary device (2) determines whether the TRCP >= 3+DPT.
[0049] At step S8, in response to determining that the maximum DPT threshold of the DPT criteria is not met, the method includes controlling the flow of the refrigerant using the flow control value (5) to maintain the predefined temperature inside the vehicle (1).
[0050] Further, at step S9, in response to demining that both the minimum DPT threshold and the maximum DPT threshold of the DPT criteria is met, the method includes storing refrigerant using the AC

system (8) to maintain a predefined temperature inside the vehicle (1) by exchanging heat between the interior of the vehicle (1) and the RCP (3) in response to determining that the temperature of the RCP (3) meets the DPT criteria.
[0051] In an embodiment, the thermostatic expansion valve (9) to operate the RCP (3). The thermostatic expansion valve (9) receives a predetermined portion of refrigerant from a condenser (11) of the AC system (8). The thermostatic expansion valve (9) expands the refrigerant received from the condenser (11) and make the refrigerant cool, and the refrigerant thus cooled from the thermostatic expansion valve (9) flows into the refrigerant lines (4) for assisting cooling of interior of the vehicle (1).
[0052] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
[0053] List to reference numerals:

Sr. No. Description
1 vehicle

2 auxiliary device
3 radiant cooling panel
4 refrigerant lines
5 flow control value
6 refrigerant inlet
7 refrigerant outlet
8 AC system
9 thermostatic expansion valve (TXV1)
10 compressor
11 condenser
12 thermostatic expansion valve (TXV2)
13 evaporator

We Claim:
1. An auxiliary device (2) for assisting cooling of interior of a vehicle (1),
wherein the auxiliary device (2) comprises:
a radiant cooling panel (RCP) (3) positioned on an interior surface of a roof the vehicle (1), wherein the RCP (3) comprises a plurality of refrigerant lines (4) connected to an Air Conditioning (AC) system (8) of the vehicle (1); and
a thermostatic expansion valve (9) to operate the RCP (3), wherein the thermostatic expansion valve (9) receives a predetermined portion of refrigerant from a condenser (11) of the AC system (8), wherein the thermostatic expansion valve (9) expands the refrigerant received from the condenser (11) and make the refrigerant cool, and wherein the refrigerant cooled from the thermostatic expansion valve (9) flows into the refrigerant lines (4) for assisting cooling of the interior of the vehicle (1).
2. The auxiliary device (2) as claimed in claim 1, wherein maintain the
predefined temperature comprises:
determine a temperature of the RCP (3);
determine whether the temperature of the RCP (3) meets the dew point temperature (DPT) criteria; and
exchange heat between the interior of the vehicle (1) and the RCP (3) without controlling the flow of the refrigerant to maintain the predefined temperature inside the vehicle (1) in response to determining that the temperature of the RCP (3) meets the DPT criteria, and

control the flow of the refrigerant into the plurality of refrigerant lines (4) using the flow control value (5) to maintain the predefined temperature inside the vehicle (1) in response to determining that the temperature of the RCP (3) does not meets the DPT criteria.
3. The auxiliary device (2) as claimed in claim 2, wherein control the flow
of the colorant into the plurality of refrigerant lines (4) using the flow
control value (5) to maintain the predefined temperature inside the
vehicle (1) comprises:
determine whether the temperature of the RCP (3) meets a minimum DPT threshold or a maximum DPT threshold of the DPT criteria; and
switch off the flow of the refrigerant using the flow control value (5) to maintain the predefined temperature inside the vehicle (1) in response to determining that the minimum DPT threshold of the DPT criteria is not met; and
control the flow of the refrigerant using the flow control value (5) to maintain the predefined temperature inside the vehicle (1) in response to determining that the maximum DPT threshold of the DPT criteria is not met.
4. The auxiliary device (2) as claimed in claim 3, wherein the minimum
DPT threshold is determined by:
receiving a cabin temperature of the vehicle (1);
determining a DPT inside the vehicle (1) based on the cabin temperature of the vehicle (1); and

determining the minimum DPT threshold based on the DPT and a minimum constant.
5. The auxiliary device (2) as claimed in claim 3, wherein the maximum
DPT threshold is determined by:
receiving a cabin temperature of the vehicle (1);
determining a DPT inside the vehicle (1) based on the cabin temperature of the vehicle (1); and
determining the maximum DPT threshold based on the DPT and a maximum constant.
6. The auxiliary device (2) as claimed in claim 1, wherein the plurality of refrigerant lines (4) comprises a refrigerant inlet (6) and a refrigerant outlet (7) connected to the flow control value (5).
7. A method for assisting cooling of interior of a vehicle (1), wherein the method comprises:
detecting, by an auxiliary device (2), a cooling operation of an air conditioning (AC) system (6) in the vehicle (1);
determining, by the auxiliary device (2), a temperature of a radiant cooling panel (RCP) (3) connected to the AC system (8), wherein the RCP (3) is positioned on an interior surface of a roof the vehicle (1);
determining, by the auxiliary device (2), whether the temperature of the RCP (3) meets a dew point temperature (DPT) criteria; and
performing, by the auxiliary device (2), one of:

storing refrigerant using the AC system (8) to maintain a predefined temperature inside the vehicle (1) by exchanging heat between the interior of the vehicle (1) and the RCP (3) in response to determining that the temperature of the RCP (3) meets the DPT criteria, and
controlling a flow of the refrigerant into the plurality of refrigerant lines (4) using a thermostatic expansion valve (TXV1) (9) of the RCP (3) to maintain a predefined temperature inside the vehicle (1) in response to determining that the temperature of the RCP (3) does not meets the DPT criteria.
8. The method as claimed in claim 7, wherein controlling the flow of the refrigerant into the plurality of refrigerant lines (4) using the flow control value (5) to maintain the predefined temperature inside the vehicle (1) comprises:
determining, by the auxiliary device (2), whether the temperature of the RCP (3) meets a minimum DPT threshold or a maximum DPT threshold of the DPT criteria; and
performing, by the auxiliary device (2), one of:
switching off the flow of the refrigerant using the flow control value (5) to maintain the predefined temperature inside the vehicle (1) in response to determining that the minimum DPT threshold of the DPT criteria is not met, and
controlling the flow of the refrigerant using the flow control value (5) to maintain the predefined temperature inside the vehicle (1) in response to determining that the maximum DPT threshold of the DPT criteria is not met.

9. The method as claimed in claim 8, wherein the minimum DPT
threshold is determined by:
receiving, by the auxiliary device (2), a cabin temperature of the vehicle (1);
determining, by the auxiliary device (2), a DPT inside the vehicle (1) based on the cabin temperature of the vehicle (1); and
determining, by the auxiliary device (2), the minimum DPT threshold based on the DPT and a minimum constant.
10. The method as claimed in claim 8, wherein the maximum DPT
threshold is determined by:
receiving, by the auxiliary device (2), a cabin temperature of the vehicle (1);
determining, by the auxiliary device (2), a DPT inside the vehicle (1) based on the cabin temperature of the vehicle (1); and
determining, by the auxiliary device (2), the maximum DPT threshold based on the DPT and a maximum constant.
11. The method as claimed in claim 7, wherein the RCP (3) comprises a plurality of refrigerant lines (4) connected to the air conditioning system of the vehicle (1) and a flow control value (5) to operate the RCP (3).
12. The method as claimed in claim 11, wherein the plurality of refrigerant lines (4) comprises a refrigerant inlet (6) and a refrigerant outlet (7) connected to the flow control value (5).

13. The method as claimed in claim 7, comprising receiving a
predetermined portion of refrigerant from a condenser (11) of the AC system (8) into a thermostatic expansion valve (9) receives, wherein the thermostatic expansion valve (9) expands the refrigerant received from the condenser (11) and make the refrigerant cool, and wherein the refrigerant cooled from the thermostatic expansion valve (9) flows into the refrigerant lines (4) for assisting cooling of interior of the vehicle (1).