FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10; rule 13] TITLE: SYSTEM AND METHOD FOR OPERATING HVAC SYSTEM IN VEHICLE
Name and Address of the Applicant:
TATA MOTORS PASSENGER VEHICLES LIMITED, an Indian company having its registered office at Floor 3, 4, Plot-18, Nanavati Mahalaya, Mudhana Shetty Marg, BSE, Fort, Mumbai, Mumbai City, Maharashtra, 400001 India
Nationality: Indian
The following specification particularly describes the invention and the manner in which it is performed.

TECHNICAL FIELD
[001] The present disclosure generally relates to control of vehicle Heating, Ventilation and Air
Conditioning (HVAC) system, and more particularly, control of HVAC system.
BACKGROUND OF THE DISCLOSURE
[002] Electronic control systems for vehicles enable improved efficiency, comfort and safety. While the vehicle systems need to be controlled to meet user comfort and safety requirements, they need to be operated economically, in the sense of not using unnecessary energy from the vehicle. The energy efficiency requirements need to be satisfied.
[003] Existing climate control systems obtain various internal and external parameters such as cabin temperature, environment temperature, humidity, user desired temperature to operate the HVAC system. Considering a user desired temperature setpoint and the abovementioned parameters the HVAC system is operated.
[004] The existing control systems are not optimized and they are not economical as they only consider user comfort and safety requirements but not the energy efficiency requirements.. Hence, there is a need for a control system that operates the HVAC system in an optimized manner.
[005] The information disclosed in this background of the disclosure section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
SUMMARY OF THE DISCLOSURE
[006] In an embodiment, a method for controlling Heating, Ventilation and Air Conditioning (HVAC) system in a vehicle is disclosed. The method comprises receiving, by a climate control system, one or more parameters indicating a path of the vehicle, from one or more information sources; predicting, by the climate control system, a change in speed of the vehicle using the one or more parameters; and controlling, by the vehicle climate control system, a compressor of the

HVAC system based on the predicted speed of the vehicle to adjust temperature of a passenger cabin of the vehicle.
[007] In some embodiments is disclosed is a climate control system, comprising: a control unit. The control unit is configured to receive one or more parameters indicating a path of the vehicle, from one or more information sources; predict a change in speed of the vehicle using the one or more parameters; and control a compressor of the HVAC system based on the predicted speed of the vehicle to adjust temperature of a passenger cabin of the vehicle.
[008] In yet another embodiment a vehicle is disclosed. The vehicle comprises a Heating, Ventilation and Air Conditioning (HVAC) system comprising: a compressor; and one or more flaps. The vehicle further comprises a climate control system, comprising: a control unit configured to: receive one or more parameters indicating a path of the vehicle, from one or more information sources; predict a change in speed of the vehicle using the one or more parameters; and control a compressor of the HVAC system based on the predicted speed of the vehicle to adjust temperature of a passenger cabin of the vehicle.
[009] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[010] The novel features and characteristics of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives, and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiments when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:

[011] FIG. 1 illustrates a vehicle schematic for operating HVAC system, in accordance with an embodiment of the present disclosure;
[012] FIG. 2 illustrates a climate control system for operating a HVAC system, in accordance with an embodiment of the present disclosure;
[013] FIG. 3 illustrates a method of operating a HVAC system, in accordance with an embodiment of the present disclosure;
[014] FIG. 4 illustrates a flow chart for operating the HVAC system when predicted vehicle speed is greater than first speed threshold, in accordance with an embodiment of the present disclosure;
[015] FIG. 5 illustrates a flow chart for operating the HVAC system when predicted vehicle speed is less than second speed threshold, in accordance with an embodiment of the present disclosure;
and
[016] FIG. 6 illustrates a flow chart for operating the HVAC system when the vehicle is predicted to reach the destination within first time threshold, in accordance with an embodiment of the present disclosure.
[017] It should be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative systems embodying the principles of the present subject matter. Similarly, it will be appreciated that any flow charts, flow diagrams, state transition diagrams, pseudo code, and the like represent various processes which may be substantially represented in computer readable medium and executed by a computer or processor, whether or not such computer or processor is explicitly shown.
DETAILED DESCRIPTION
[018] In the present document, the word “exemplary” is used herein to mean “serving as an example, instance, or illustration”. Any embodiment or implementation of the present subject matter described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[019] While the disclosure is susceptible to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the drawings and will be described in detail below. It should be understood, however that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the spirit and the scope of the disclosure.
[020] The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, device, or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or method. In other words, one or more elements in a device or system or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the device or system or apparatus.
[021] In the following detailed description of the embodiments of the disclosure, reference is made to the accompanying drawings that form a part hereof, and in which are shown by way of illustration specific embodiments in which the disclosure may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the disclosure, and it is to be understood that other embodiments may be utilized and that changes may be made without departing from the scope of the present disclosure. The following description is, therefore, not to be taken in a limiting sense.
[022] The present disclosure describes systems and methods for controlling power to a heating, ventilation, and air conditioning (HVAC) system based on predicted vehicle speed. The systems and methods provide various benefits and advantages such as improving vehicle efficiency and durability of vehicle components, while providing comfort to vehicle occupants. The proposed system optimizes the total power consumption of vehicle.
[023] FIG. 1 illustrates a vehicle schematic 100 for operating an HVAC system, in accordance with an embodiment of the present disclosure. In some embodiments, a vehicle (not shown) is a Commercial Vehicle (CV) such as a trailer, a truck, a bus, or any other CV. In some embodiments,

the vehicle can be a passenger vehicle such as a car, a sports utility vehicle (SUV), and the like. The vehicle includes a climate control system 102, one or more internal information sources (101a, 101b, 101c,), and a Heating Ventilation and Air Conditioning (HVAC) system 103. The vehicle may be connected to one or more external information sources 101d. Further, the one or more internal information sources (101a, 101b, 101c) may be referred to as the one or more internal sources and the one or more external information sources (101d) may be referred to as the one or more external sources. The HVAC system 103 may include a compressor 103a and one or more flaps 103b (also commonly referred to as flap actuators).
[024] In an embodiment, the one or more internal sources 101a, 101b, 101c may include, but are not limited to a humidity sessor, a cabin temperature sensor, an environment sensor (such as temperature, rain, humidity, solar load etc.,), a Light Detection and Ranging (LIDAR), a Radio Detection and Ranging (RADAR), a camera, a Global Positioning System (GPS) sensor, a vehicle speed sensor, and the like. In an embodiment, the one or more external sources 101d may include a weather database and may be located remotely in a server. The weather database may be in communication with the vehicle to provide weather information to the vehicle. Another example may include a mobile phone which may be associated with a user of the vehicle and may be connected to the vehicle to provide path information such as source and destination information. In further examples, the one or more external sources 101d may include sources that may communicate with the vehicle and provide real time information of traffic, weather, and the like. In other words, the external sources 101d may include systems that may indulge in a V2X communication with the vehicle hosting the HVAC system 100. For example, the external sources 101d may include another vehicle (which may provide information about the traffic visible to it), a traffic light (which may inform the vehicle the traffic light is about to turn red in the next dew seconds), and a camera installed along the road on which the vehicle is travelling. In some embodiments, the one or more internal sources 101a, 101b, 101c and the one or more external sources 101d may be used in combination in some embodiments of the present disclosure. Further, the one or more information sources 101 may also include a computing device equipped with a navigation application and connected with the vehicle. The computer device may be a smartphone, a laptop, a Personal Digital Assistant (PDA), a digital assistant, a tablet, a wearable device such as

smart watch. The HVAC system 103 may include more other components and are not shown in Fig. 1.
[025] The compressor 103a typically compresses a refrigerant which is then circulated in the HVAC system 103. The one or more flaps 103b is used for directing flow of air in the HVAC system 103. The climate control system 102 is configured to operate the HVAC system 103 based on inputs received from one or more information sources 101. Here, the one or more information sources 101 may include an internal source, such as the internal source 101a-c, and/or an external source, such as the external source 101d. The one or more information sources 101 may also be referred to as one or more sources 101. In an embodiment, the one or more sources 101 may include more than one internal source and/or more than one external source. For example, the climate control system 102 may operate the HVAC system 103 based on inputs from a smartphone. In another example, the climate control system 102 may operate the HVAC system 103 based on inputs from a smartphone, RADAR, LIDAR, another vehicle, a traffic light, a roadside camera, and GPS. Additionally, the climate control system 102 may receive inputs from a user. In an embodiment, the climate control system 102 may receive one or more parameters indicating a path of the vehicle from the one or more sensors 102. The one or more parameters may include, but not limited to source location, destination location, speed of the vehicle, acceleration of the vehicle, terrain of a path, traffic on the path, and the like. In some embodiments, the source location and the destination location, the terrain of the path may be obtained from a map application of the computer device associated with the vehicle. The climate control system 102 may predict a change in speed of the vehicle using the one or more parameters. Further, the climate control system 102 is configured to operate the compressor 103a of the HVAC system 103 based on the predicted change in speed of the vehicle. Additionally, the climate control system 102 may operate the one or more flaps 103b of the HVAC system 103.
[026] Fig. 2 illustrates the climate control system 102. The climate control system 102 may be configured to control the HVAC system 103 of the vehicle. The climate control system 102 is depicted to include a control unit 201, a memory 202, a communication interface 203 and an Input/Output module 204. It shall be noted that, in some embodiments, the climate control system 102 may include more or fewer components than those depicted herein. The various components of the climate control system 102 may be implemented using hardware, software, firmware or any

combinations thereof. Further, the various components of the climate control system 102 may be operably coupled with each other. More specifically, various components of the climate control system 102 may be capable of communicating with each other using communication channel media (such as buses, interconnects, etc.).
[027] In one embodiment, the control unit 201 may be embodied as a multi-core processor, a single core processor, or a combination of one or more multi-core processors and one or more single core processors. For example, the control unit 201 may be embodied as one or more of various processing devices, such as a coprocessor, a microprocessor, a controller, a digital signal processor (DSP), a processing circuitry with or without an accompanying DSP, or various other processing devices including, a microcontroller unit (MCU), a hardware accelerator, a special-purpose computer chip, or the like. In an example, the control unit 201 may be an electronic control unit (ECU) controlling the climate control functions in the vehicle.
[028] In one embodiment, the memory 202 is capable of storing machine executable instructions, referred to herein as instructions. In an embodiment, the control unit 201 is embodied as an executor of software instructions. As such, the control unit 201 is capable of executing the instructions stored in the memory 202 to perform one or more operations described herein. For example, the memory 202 may include one or more volatile or non-volatile memories, or a combination thereof. For example, the memory 202 may be embodied as semiconductor memories, such as flash memory, mask ROM, PROM (programmable ROM), EPROM (erasable PROM), RAM (random access memory), etc. and the like.
[029] In an embodiment, the control unit 201 is configured to execute the instructions for: (1) receiving one or more parameters indicating a path of the vehicle, from one or more information sources (101), (2) predicting a change in speed of the vehicle using the one or more parameters, (3) controlling a compressor of the HVAC system based on the predicted speed of the vehicle to adjust temperature of a passenger cabin of the vehicle.
[030] In an embodiment, the I/O module 204 may include mechanisms configured to receive user inputs. To enable reception of inputs and provide outputs, the I/O module 204 may include at least

one input interface and/or at least one output interface. The I/O module 204 may be used by the user to provide temperature factor. The temperature factor may be additionally used to further optimize the cabin temperature and reduce power consumption. This optimizes the process of controlling the HVAC system 103. In an embodiment, the temperature setpoint is calculated based on the predicted speed of the vehicle and the temperature factor.
[031] Examples of the input interface may include, but are not limited to, a keyboard, a mouse, a joystick, a keypad, a touch screen, soft keys, a microphone, and the like. Examples of the output interface may include, but are not limited to, a display such as a light emitting diode display, a thin-film transistor (TFT) display, a liquid crystal display, an active-matrix organic light-emitting diode (AMOLED) display, a microphone, a speaker, a ringer, and the like. It shall be noted that, the I/O module 204 may be an optional component and some the control unit 201 may be implemented without the I/O module 204.
[032] The communication interface 203 may include mechanisms configured to communicate with external entities/peripheral devices, for example, one or more information sources 101 for receiving parameters indicating a path of the vehicle.
[033] The control unit 201 is depicted to be in operative communication with a database (not shown). In one embodiment, the database is configured to store user profile. The user profile may store data related to different users and their preference in relation to temperature, humidity, blower speed, and the like.
[034] The database may include multiple storage units such as hard disks and/or solid-state disks in a redundant array of inexpensive disks (RAID) configuration. In some embodiments, the database may include a storage area network (SAN) and/or a network attached storage (NAS) system. In one embodiment, the database may correspond to a distributed storage system, wherein individual databases are configured to store custom data. In some embodiments, the database is integrated within the control unit 201. For example, the control unit 201 may include one or more hard disk drives as the database. In other embodiments, the database is external to the control unit 201 and may be accessed by the control unit 201 using a storage interface (not shown in FIG. 2).

The storage interface is any component capable of providing the control unit 201 with access to the database.
[035] The control unit 201 in conjunction with the instructions is configured to predict a change in speed of the vehicle. In some embodiments, the control unit 201 may use statistical or Artificial Intelligence (AI) techniques or rule based techniques to predict the change in speed of the vehicle. The control unit 201 obtains the one or more parameters indicating the path of the vehicle to predict the change in speed. For example, parameters such as source location, destination location and path information such as terrain type, traffic data may be obtained from a map application. In some embodiments, the traffic information may be obtained using sensors such as the LIDAR, the RADAR, the camera or from other information sources such as Vehicle to Vehicle (V2V) communication, vehicle to Infrastructure (V2X) communication. For example, LIDAR sensors can be used to detect number of vehicle on a road in all weather conditions. Hence, traffic information may be obtained from LIDAR sensors irrespective of weather conditions. Further, LIDAR can also be used to understand terrain information as LIDAR provides 3D information. The V2V communication can be helpful in predicting the weather or traffic conditions. For example, a first vehicle may provide traffic or weather information with a second vehicle which may be behind the first vehicle in a path. Likewise, an infrastructure may provide traffic information to the vehicle. For example, a traffic department may provide information related to traffic in a particular path to the vehicle via V2X communication standards. In some examples, the RADAR data can be used to detect number of vehicles in a path. Also, speed of the vehicles may be determined using the RADAR data which can be further used to determine road conditions. In one scenario, a path where all the vehicles moves slowly and when the vehicle density is less, the path can be determined to be uneven. Further, current speed and current location of the vehicle may be obtained from the vehicle. Using these parameters the control unit 201 can determine the change in speed of the vehicle. Referring the same example, when the control unit 201 can determine that the vehicle is entering a path having heavy traffic, and predict that the vehicle speed will reduce. Likewise, when the control unit determines that the vehicle is entering a region of less traffic, such as an expressway, a prediction may be made that the vehicle speed will increase. The control unit 201 may also predict a future speed of the vehicle, such as an increased speed once the vehicle enters

the region of less traffic. Furthermore, the control unit 201 is configured to control the compressor 103a of the HVAC system 103 based on the change in speed of the vehicle.
[036] In an embodiment, the control unit 201 is configured to operate the compressor 103a at low power to undercool a passenger cabin of the vehicle when the predicted speed of the vehicle is more than a first speed threshold value. In an embodiment, if the HVAC system 103 is used for heating the passenger cabin, the control unit 201 is configured to operate the compressor 103a at low power to underheat a passenger cabin of the vehicle when the predicted speed of the vehicle is more than a first speed threshold value. Here, underheating may refer to supplying lesser heat as compared to the heat that may be demanded. For example, if the cabin was required to be heated to 23° C, the cabin may be heated to 21° C. .
[037] In an embodiment, the control unit 201 is configured to operate the compressor 103a at high power to overcool the passenger cabin of the vehicle when the predicted speed of the vehicle is less than a second speed threshold value. In an embodiment, if the HVAC system 103 is used for heating the passenger cabin, the control unit 201 is configured to operate the compressor 103a at high power to overheat the passenger cabin of the vehicle when the predicted speed of the vehicle is less than a second speed threshold value.
[038] In an embodiment, the control unit 201 is configured to predict that the vehicle will reach the destination location in less than a first time threshold value. The control unit 201 is further configured to shut off the compressor 103a in response to prediction that the vehicle will reach the destination location in less than the first time threshold value. Referring to the previous example, the control unit 201 may predict that the vehicle will reach the destination location in 10 minutes using parameters received from the one or more information sources 101. Therefore, the control unit 201 may switch off the compressor 103a upon such prediction. Hence, the HVAC system 103 is operated efficiently to save power and fuel.
[039] In an embodiment, controlling of the compressor involves controlling the compressor the mass flow rate of the compressor. For instance, if the passenger cabin is to be undercooled, the mass flow rate of the compressor is reduced and if the passenger cabin is to be overcooled, the

mass flow rate of the compressor is increased. The control of the mass flow rate of the compressor is performed using one or more techniques, such as controlling displacement of the compressor, controlling speed (i.e., RPM) of the compressor, or the like. The technique used for controlling the mass flow rate may depend on the type of the compressor used in the vehicle. For example, the compressor 103a may be a fixed displacement compressor or a variable displacement compressor. Controlling a variable displacement compressor includes controlling displacement of the compressor based on the prediction of the speed of the vehicle. A displacement value of the compressor indicates amount of refrigerant provided to the compressor which impacts the cooling. In an embodiment, the control unit 201 is configured to increase or decrease the displacement value of the variable displacement compressor based on the predicted speed of the vehicle. The controlling of the displacement controls the power consumption of the compressor. For example, increasing the displacement increases the power consumption, increases the mass flow rate, and increases the cooling of the cabin (i.e., overcooling). Correspondingly, decreasing the displacement may decrease the power consumption, mass flow rate, and the cooling of the cabin (i.e., undercooling).
[040] In some embodiments, the control unit 201 is configured to decrease the displacement of the variable displacement compressor when the speed of the vehicle is predicted to increase more than the first speed threshold value from a current speed of the vehicle which may be less than the first speed threshold value. For example, the first speed threshold may be 60kmph. When the speed of the vehicle is predicted to reach more than 60kmph, the displacement of the variable displacement compressor may be decreased. In other words, the cabin of the vehicle may be undercooled when the speed of the vehicle is predicted to increase beyond 60 kmph. The cabin may be undercooled for a predicted high speed since a high speed of the vehicle provides more heat exchange to the HVAC system 103, which enables more cooling. Therefore, the power required to cool the cabin of the vehicle is reduced and/ or the displacement of the compressor is decreased to reduce power consumption of the compressor.
[041] In a further embodiment, the control unit 201 is configured to operate the one or more flaps 103b of the HVAC system 103 to close a hot air branch and open a cold air branch to allow air to flow into the passenger cabin of the vehicle.

[042] In an embodiment, the control unit 201 is configured to adjust the temperature setpoint based on the predicted speed. For example, when the speed of the vehicle is predicted to increase to a speed more than the first speed threshold value, the temperature setpoint may be increased. Further, when the speed of the vehicle is predicted to reduce to a speed less than the second speed threshold value, the temperature setpoint may be reduced.
[043] In some embodiments, the control unit 201 is configured to increase the displacement of the variable displacement compressor when the speed of the vehicle is predicted to reduce to a speed less than the second speed threshold value. For example, the second speed threshold may be 30kmph. When the speed of the vehicle is predicted reduce to less than 30kmph from, say 50kmph, the displacement of the compressor is increased. For example, when the vehicle is travelling at an expressway at a high speed and it is predicted that the vehicle speed is to drop to less than 30 kmph due to exiting the expressway and entering a congested city road, the cabin may be overcooled. The overcooling may be performed for a predicted reduction in the speed since the heat exchange efficiency is about to drop due to a drop in the speed of the vehicle. In a further embodiment, the control unit 201 is configured to operate the one or more flaps 103b of the HVAC system 103 to allow cold air to flow into the passenger cabin of the vehicle.
[044] In an embodiment, when the compressor 103a is a fixed displacement compressor, the climate control system 103 operates the compressor 103a according to the predicted speed of the vehicle. When the speed of the vehicle is predicted to increase to be more than the first speed threshold value, the compressor 103a is operated at low power. The operation further includes increasing the temperature setpoint of the cabin of the vehicle. Further, the climate control system 102 may close the hot air branch and opens the cold air branch of the one or more flaps 103b to further cool the cabin. Therefore, the overall power consumption is reduced. When the speed of the vehicle is predicted to decrease below the second speed threshold value the compressor 103a is operated at high power the compressor 103a is operated at high power and the one or more flaps 103b is operated to allow cool air inside the cabin. When the vehicle is predicted to reach the destination location within the first time threshold value the compressor 103a is shut down.
[045] Fig. 3 is a flowchart illustrating a method 300 for operating the HVAC 103 of the vehicle, in accordance with an embodiment of the present disclosure. The method 300 depicted in the flow

diagram may be executed by, for example, the climate control system 102. Operations of the flow diagram, and combination of operations in the flow diagram, may be implemented by, for example, hardware, firmware, a processor, circuitry and/or a different device associated with the execution of software that includes one or more computer program instructions. The operations of the method 300 are described herein with help of the control unit 201 of the climate control system 102. It is noted that the operations of the method 300 can be described and/or practiced by using the control unit 201. The method 300 starts at operation 302.
[046] At operation 302, the method 300 comprises, receiving one or more parameters indicating a path of the vehicle, from one or more information sources 101. The one or more parameters includes, but not limited to, speed of the vehicle, a location of the vehicle, information relating to the path of the vehicle such as terrain, traffic and the like, temperature and humidity in the cabin of the vehicle, temperature and humidity outside the vehicle, and weather data.
[047] At operation 304, the method 300 comprises predicting a change in speed of the vehicle using the one or more parameters.
[048] At step 306, the method 300 comprises controlling a compressor of the HVAC system 103 based on the predicted speed of the vehicle to adjust temperature of a passenger cabin of the vehicle.
[049] The sequence of operations of the methods 300 need not be necessarily executed in the same order as they are presented. Further, one or more operations may be grouped together and performed in form of a single step, or one operation may have several sub-steps that may be performed in parallel or in sequential manner.
[050] The disclosed method with reference to Fig. 3, or one or more operations of the flow diagram 300 may be implemented using software including computer-executable instructions stored on one or more computer-readable media (e.g., non-transitory computer-readable media, such as one or more optical media discs, volatile memory components (e.g., DRAM or SRAM), or non-volatile memory or storage components (e.g., hard drives or solid-state non-volatile

memory components, such as Flash memory components) and executed on a computer (e.g., any suitable computer, such as a laptop computer, net book, Web book, tablet computing device, smart phone, or other mobile computing device). Such software may be executed, for example, on a single local computer.
[051] Fig. 4 illustrates a flow chart for operating the HVAC system 103 when predicted vehicle speed has increased from a current speed which is lesser than the first speed threshold to a speed greater than the first speed threshold, in accordance with an embodiment of the present disclosure. At 401, the climate control system 102 checks whether the predicted speed of the vehicle is greater than the current speed and the first speed threshold. At 402, when the climate control system 102 determines that the predicted speed of the vehicle is not greater than the first speed threshold, the climate control system 103 applies a standard control to the HVAC system 103 as shown in block 403. In an embodiment, the standard control may be according to user desired setpoint. When the climate control system 102 determines that the predicted speed of the vehicle is greater than the current speed and the first speed threshold at step 402, the climate control system 103 controls the compressor 103a of the vehicle. The control may be such that the mass flow rate of the compressor is controlled as shown at block 404. The mass flow rate may be adjusted, for example, by controlling the displacement, speed of the compressor, or both.
[052] If the compressor 103a is a fixed displacement compressor as shown at block 405, the climate control system 103 operates the compressor 103a at low power as shown at block 407. The operation at the low point may involve increasing the temperature setpoint of the cabin of the vehicle. Further, the climate control system 102 closes the hot air branch and opens the cold air branch of the one or more flaps 103b. If the compressor 103a is a variable displacement compressor as shown at block 406, the climate control system 103 operates the compressor 103a at reduced power as shown at block 408. The operation of the compressor at the reduced power may involve reducing a displacement of the compressor, thus reducing the intake of refrigerant into the compressor 103a to undercool the cabin. Further, the climate control system 102 closes the hot air branch and opens the cold air branch of the one or more flaps 103b.
[053] Fig. 5 illustrates a flow chart for operating the HVAC system when predicted vehicle speed is less than current speed and second speed threshold, in accordance with an embodiment of the

present disclosure. At 501, the climate control system 102 checks whether the predicted speed of the vehicle is lesser than the current speed and the first speed threshold. At 502, when the climate control system 102 determines that the predicted speed of the vehicle is not lesser than the first speed threshold, the climate control system 103 applies a standard control to the HVAC system 103 as shown at block 503. In an embodiment, the standard control may be according to user desired setpoint. When the climate control system 102 determines that the predicted speed of the vehicle is lesser than the current speed and the first speed threshold at step 402, the climate control system 103 controls the compressor 103a of the vehicle.
[054] If the compressor 103a is a fixed displacement compressor as shown at block 505, the climate control system 103 may operate the compressor 103a at high power as shown at block 507. This may involve reducing the temperature setpoint of the cabin. Further, the climate control system 102 opens the cold air branch of the one or more flaps 103b. When the compressor 103a is a variable displacement compressor a shown at block 506, the climate control system 103 operates the compressor 103a at high power as shown at block 508. For example, the climate control system 102 may increase the displacement of the compressor 103a, thus increasing the intake of refrigerant into the compressor 103a to overcool the cabin. Further, the climate control system 102 opens the cold air branch of the one or more flaps 103b.
[055] FIG. 6 illustrates a flow chart for operating the HVAC system 103 when predicted vehicle is predicted to reach the destination within the first time threshold, in accordance with an embodiment of the present disclosure. At 601, the climate control system 102 checks whether the predicted speed of the vehicle is approaching the destination within the first time threshold. At 602, when the climate control system 102 determines that the predicted speed of the vehicle is not approaching the destination within the first time threshold, the climate control system 103 applies a standard control to the HVAC system 103 or a predictive control based on the predicted speed, as explained above. When the climate control system 102 determines that the predicted speed of the vehicle is approaching the destination within the first time threshold at step 602, the climate control system 103 controls the compressor 103a of the vehicle. When the compressor 103a is a fixed displacement compressor or a variable displacement compressor, the climate control system

103 shuts down the compressor 103a. Therefore, the power consumption is reduced as the cooling of the cabin is reduced as the vehicle approaches a destination.
[056] In the above explanation, the controlling of operation of the HVAC system when the HVAC system is used for cooling is explained. However, the present subject matter can also be used for controlling heating of the passenger cabin when a heating requirement is present. For example, in the case of a heating requirement, when the predicted speed is higher than a threshold speed, the cabin may be underheated, for example, by reducing the mass flow rate of the compressor of the HVAC system. Similarly, when the predicted speed is lower than a threshold speed, the cabin may be overheated, for example, by increasing the mass flow rate of the compressor of the HVAC system. Therefore, the present subject matter can be used for reducing the power consumption of the HVAC system in both cooling and heating scenarios.
[057] Although the present subject matter is explained with reference to terrestrial vehicles, the present subject matter may be utilized for controlling HVAC systems of other types of vehicles as well, such as aircrafts and ships.
[058] Various embodiments of the present disclosure provide numerous advantages. Embodiments of the present disclosure ensure efficient usage of the HVAC system 103. The present disclosure ensures optimized usage of fuel as the HVAC system 103 is controlled according to the predicted speed of the vehicle.
[059] It will be understood by those within the art that, in general, terms used herein, and are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). For example, as an aid to understanding, the detail description may contain usage of the introductory phrases “at least one” and “one or more” to introduce recitations. However, the use of such phrases should not be construed to imply that the introduction of a recitation by the indefinite articles “a” or “an” limits any particular part of description containing such introduced recitation to inventions containing only one such recitation, even when the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”) are included in the recitations; the same holds true for the use of

definite articles used to introduce such recitations. In addition, even if a specific part of the introduced description recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations or two or more recitations).
[060] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following detailed description

We Claim:
1. A method for controlling Heating, Ventilation and Air Conditioning (HVAC) system (103) in a
vehicle, comprising:
receiving, by a climate control system (102), one or more parameters indicating a path of the vehicle, from one or more sources (101);
predicting, by the climate control system (102), a change in speed of the vehicle using the one or more parameters;
and
controlling, by the vehicle climate control system (102), a compressor (103a) of the HVAC system (103) based on the predicted speed of the vehicle to adjust temperature of a passenger cabin of the vehicle.
2. The method of claim 1, wherein controlling the compressor comprises controlling a mass flow rate of the compressor.
3. The method as claimed in claim 2, wherein the compressor (103a) is operated at low power to undercool or underheat the passenger cabin when the predicted speed of the vehicle has increased to be more than a first speed threshold value.
4. The method as claimed in claim 2, wherein the compressor (103a) is operated at high power to overcool or overheat the passenger cabin of the vehicle when the predicted speed of the vehicle has decreased to be less than a second speed threshold value.
5. The method as claimed in claim 1, wherein predicting the speed of the vehicle further comprises:
predicting that the vehicle will reach the destination in less than a first time threshold value, wherein the method further comprises:
shutting off the compressor (103a) in response to prediction that the vehicle will reach the destination in less than the first time threshold value.

6. The method as claimed in claim 3, wherein the compressor (103a) is a variable displacement
compressor, and wherein controlling the variable displacement compressor comprises:
decreasing a displacement of the variable displacement compressor when the predicted speed of the vehicle has increased to be more than the first speed threshold value.
7. The method as claimed in claim 6, further comprises:
operating one or more flaps (103b) of the HVAC system (103) to close a hot air branch of the HVAC system (130) and open a cold air branch of the HVAC system (103) to allow air to flow into the passenger cabin of the vehicle.
8. The method as claimed in claim 4, wherein the compressor (103a) is a variable displacement
compressor, and wherein controlling the variable displacement compressor comprises:
increasing a displacement of the variable displacement compressor when the predicted speed of the vehicle has decreased to be less than the second speed threshold value.
9. The method as claimed in claim 8, further comprises:
operating one or more flaps (103b) of the HVAC system (103) to allow cool air to flow into the passenger cabin of the vehicle.
10. A climate control system (102) for controlling Heating, Ventilation and Air Conditioning
(HVAC) system (103) in a vehicle, comprising:
a control unit (201) configured to:
receive one or more parameters indicating a path of the vehicle, from one or more sources (101);
predict a change in speed of the vehicle using the one or more parameters;
and
control a compressor (103a) of the HVAC system (103) based on the predicted speed of the vehicle to adjust temperature of a passenger cabin of the vehicle.

11. The climate control system (102) as claimed in claim 10, wherein the control unit is configured
to control a mass flow rate of the compressor.
12. The climate control system (102) as claimed in claim 11, wherein control unit (201) is configured to operate the compressor (103a) at low power to undercool or underheat the passenger cabin when the predicted speed of the vehicle has increased to be more than a first speed threshold value.
13. The climate control system (102) as claimed in claim 9, wherein the control unit (201) is configured to operate the compressor (103a) at high power to overcool or overheat the passenger cabin of the vehicle when the predicted speed of the vehicle has decreased to be less than a second speed threshold value.
14. The climate control system (102) as claimed in claim 10, wherein the compressor (103a) is a variable displacement compressor, and wherein the control unit (201) is configured to control the variable displacement compressor, wherein the control unit (201) is configured to:
decrease a displacement of the variable displacement compressor when the predicted speed of the vehicle has increased to be more than the first speed threshold value.
15. The climate control system (102) as claimed in claim 13, wherein the control unit (201) is
further configured to:
operate one or more flaps (103b) of the HVAC system (103) to close a hot air branch of the HVAC system (103) and open a cold air branch of the HVAC system (103) to allow air to flow into the passenger cabin of the vehicle.
16. A vehicle, comprising:
a Heating, Ventilation and Air Conditioning (HVAC) system (103) comprising:
a compressor (103a); and
one or more flaps (103b); and a climate control system (102), comprising:

a control unit (201) configured to:
receive one or more parameters indicating a path of the vehicle, from one or more sources (101);
predict a change in speed of the vehicle using the one or more parameters; and
control the compressor (103a) of the HVAC system (103) based on the predicted speed of the vehicle to adjust temperature of a passenger cabin of the vehicle.