Air conditioning system for automotive vehicles

Abstract

The present invention relates to a vehicle air conditioning system and aims to enable the rear seat air conditioning unit to be operated independently without starting the vehicle or turning on the front seat air conditioning unit, thereby enabling independent cooling of the rear seat area under the condition of the vehicle's engine being off while minimizing energy consumption. To achieve this objective, the present invention provides a vehicle air conditioning system comprising a front seat air conditioning unit for cooling and heating the front seat portion of the vehicle interior and a rear seat air conditioning unit for cooling the rear seat portion of the vehicle interior, wherein the system comprises a control unit that determines whether the vehicle and the outside air condition satisfy at least one preset condition, and when the preset condition is satisfied, controls the flow of the compressor and refrigerant to operate the rear seat air conditioning unit independently while entering a rear seat-only cooling mode.

Description

Technology Field

[0001] The present invention relates to a vehicle air conditioning system, and more specifically, to a vehicle air conditioning system that can operate the rear seat air conditioning unit independently without starting the vehicle and turning on the front seat air conditioning unit, thereby enabling independent cooling of the rear seat area under conditions where the vehicle's engine is off while minimizing energy consumption. Background Technology

[0002] Recently, individual air conditioning systems that independently cool and heat multiple areas within the vehicle cabin are being developed. For example, front and rear individual air conditioning systems that independently cool and heat the front and rear sections of the cabin have been developed and are in use.

[0003] As shown in FIG. 1, the individual air conditioning unit for the front and rear seats is equipped with a compressor (10), a high-pressure heat exchanger (12), and a front seat air conditioning unit (20) and a rear seat air conditioning unit (30) connected in parallel to the compressor (10) and the high-pressure heat exchanger (12).

[0004] The front seat air conditioning unit (20) is for cooling the front seat portion of the vehicle interior and includes an expansion valve (22), a low-pressure side heat exchanger (24), and a blower (26) that blows the cold air from the low-pressure side heat exchanger (22) to the front portion of the vehicle interior.

[0005] The rear air conditioning unit (30) is for cooling the rear seat portion of the vehicle interior and includes a bypass line (32) that bypasses the refrigerant that has passed through the high-pressure side heat exchanger (12), an expansion valve (34) and a low-pressure side heat exchanger (36) installed in the bypass line (32), and a blower (38) that blows the cold air from the low-pressure side heat exchanger (36) to the rear portion of the vehicle interior.

[0006] However, since this conventional air conditioning system is structured to be turned off simultaneously when the vehicle's engine is turned off, there is a disadvantage that the rear air conditioning unit (30) of the air conditioning system cannot be turned on due to the vehicle's engine being turned off, for example, when cooling of the rear seat area inside the vehicle is required when the vehicle's engine is turned off, after parking the vehicle at the campsite during summer car camping, and when cooling the rear seat area inside the vehicle where most camping activities take place.

[0007] Furthermore, due to these drawbacks, there is a problem in that the rear passenger compartment cannot be cooled when the engine is off during car camping, and many car campers are currently experiencing inconvenience because of this issue.

[0008] Meanwhile, due to this inconvenience, most car camping enthusiasts turn on the engine of the vehicle to cool the rear seat area inside the vehicle, but in this case, the front air conditioning unit (20) and other parts are also turned on, so there is a disadvantage that unnecessary energy consumption occurs.

[0009] In particular, in the case of electric vehicles that use electricity as an energy source, such as hybrid vehicles, electric vehicles, and fuel cell vehicles, energy consumption must be minimized to improve the vehicle's energy efficiency. However, as described above, there is a disadvantage that energy consumption cannot be minimized with a structure in which the air conditioning unit (20) for the rear seats in the vehicle cabin is turned on simultaneously and the vehicle's engine is turned on, and as a result, there is a drawback that the vehicle's fuel efficiency and energy efficiency are significantly reduced. Prior art literature

[65535] Japanese Patent Publication No. JP 2017-140880 (Aug. 17, 2017) The problem to be solved

[0010] The present invention has been devised to solve the aforementioned conventional problems, and its purpose is to provide a vehicle air conditioning system capable of operating the rear air conditioning unit independently without starting the vehicle or turning on the front air conditioning unit.

[0011] Another objective of the present invention is to enable air conditioning of the rear seat area while minimizing energy consumption by configuring the rear seat air conditioning unit to operate independently without starting the vehicle or turning on the front seat air conditioning unit.

[0012] Another objective of the present invention is to provide a vehicle air conditioning system that can improve fuel efficiency and energy efficiency by enabling air conditioning of the rear seat area while minimizing energy consumption. means of solving the problem

[0013] To achieve this objective, the vehicle air conditioning system according to the present invention comprises a front seat air conditioning unit for cooling and heating the front seat portion of the vehicle interior and a rear seat air conditioning unit for cooling the rear seat portion of the vehicle interior, and is characterized by including a control unit that determines whether the vehicle and the outside air condition satisfy at least one preset condition, and when the preset condition is satisfied, controls the flow of the compressor and refrigerant to operate the rear seat air conditioning unit independently while entering a rear seat-only cooling mode.

[0014] And the control unit is characterized by controlling the flow of the compressor and refrigerant to operate the rear air conditioning unit independently when all of the following conditions are satisfied: a first condition that the engine of the vehicle is currently turned off; a second condition that a preset time has elapsed after the engine of the vehicle is turned off; a third condition that no passengers are in the driver's seat or passenger seat of the front seat, and passengers are in the rear seat only; a fourth condition that the outside air temperature is above a preset temperature; and a fifth condition that the relative humidity of the outside air is above a preset humidity.

[0015] And the expansion valves of the front air conditioning unit and the rear air conditioning unit are variable solenoid valves in which the opening amount of the throttling passage is variably adjusted according to the magnitude of the applied voltage; and the control unit is characterized by turning on the compressor to a preset reference value when entering the rear-only cooling mode, controlling the variable expansion valve of the front air conditioning unit to close completely, and controlling the expansion valve and blower of the rear air conditioning unit to a preset reference value.

[0016] The invention further includes a rear seat controller installed to control the rear seat air conditioning unit; the control unit enters the rear seat-only cooling mode and controls the compressor and the rear seat air conditioning unit with preset reference values, and when a user operates the rear seat controller to reset the rear seat temperature, rear seat airflow level, and rear seat discharge mode, controls the compressor and the rear seat air conditioning unit according to the reset values, thereby enabling the temperature, discharge airflow, and airflow direction of the rear seat area to be controlled in accordance with the control values ​​reset by the user.

[0017] And the above control unit is characterized by the fact that, after entering the rear seat-only cooling mode, when the user turns off the rear seat-only cooling switch, it is released from the rear seat-only cooling mode and turns off both the compressor and the rear seat air conditioning unit, thereby stopping the dedicated cooling of the rear seat area.

[0018] And the above control unit is characterized by turning off both the compressor and the rear air conditioning unit when the user turns on the vehicle ignition after entering the rear-seat-only cooling mode, thereby stopping the dedicated cooling of the rear-seat area. Effects of the invention

[0019] According to the vehicle air conditioning system of the present invention, a rear-seat-only cooling switch for selecting rear-seat-only cooling is installed, and when a user operates it to select rear-seat-only cooling, the structure controls the refrigerant flow of the air conditioning system regardless of whether the vehicle's engine is off, thereby operating only the rear-seat air conditioning unit. Thus, there is an effect of being able to operate the rear-seat air conditioning unit independently without turning on the vehicle's engine or the front-seat air conditioning unit.

[0020] In particular, it has the effect of allowing the rear air conditioning unit to be operated independently after turning off the vehicle's engine at the campsite, such as during summer car camping.

[0021] In addition, since the rear air conditioning unit can be operated independently after turning off the vehicle's engine at the camping site, it has the effect of enabling cooling of the rear passenger compartment while minimizing energy consumption.

[0022] In addition, since it is possible to cool the rear passenger compartment at a car camping site while minimizing energy consumption, it is possible to simultaneously achieve interior comfort and improve the vehicle's fuel efficiency and energy efficiency. Brief explanation of the drawing

[0023] FIG. 1 is a drawing showing the configuration of a conventional vehicle air conditioning system. FIG. 2 is a drawing showing the configuration of a vehicle air conditioning system according to the present invention. FIGS. 3 and FIGS. 4 are flowcharts illustrating examples of operation of a vehicle air conditioning system according to the present invention. Specific details for implementing the invention

[0024] Hereinafter, a preferred embodiment of a vehicle air conditioning system according to the present invention will be described in detail with reference to the attached drawings (components identical to those of the prior art are described using the same reference numerals).

[0025] First, before examining the features of the vehicle air conditioning system according to the present invention, the individual air conditioning system for the front and rear seats will be briefly described with reference to FIG. 2.

[0026] The individual air conditioning unit for the front and rear seats is equipped with a compressor (10), a high-pressure side heat exchanger (12), and a front seat air conditioning unit (20) and a rear seat air conditioning unit (30) connected in parallel to the compressor (10) and the high-pressure side heat exchanger (12).

[0027] The front seat air conditioning unit (20) is for cooling the front seat portion of the vehicle interior and includes an expansion valve (22), a low-pressure side heat exchanger (24), and a blower (26) that blows the cold air from the low-pressure side heat exchanger (22) to the front portion of the vehicle interior.

[0028] The rear air conditioning unit (30) is for cooling the rear seat portion of the vehicle interior and includes a bypass line (32) that bypasses the refrigerant that has passed through the high-pressure side heat exchanger (12), an expansion valve (34) and a low-pressure side heat exchanger (36) installed in the bypass line (32), and a blower (38) that blows the cold air from the low-pressure side heat exchanger (36) to the rear portion of the vehicle interior.

[0029] Here, the expansion valves (22, 34) of the front seat air conditioning unit (20) and the rear seat air conditioning unit (30) are variable solenoid valves in which the opening amount of the throttling flow path is variably adjusted according to the magnitude of the applied voltage, and are configured to automatically control the pressure reduction and expansion amount of the refrigerant introduced into the low-pressure side heat exchanger (24, 36).

[0030] Next, the features of the vehicle air conditioning system according to the present invention will be described in detail with reference to FIG. 2.

[0031] First, the air conditioning device of the present invention is equipped with a rear seat-only cooling switch (40).

[0032] The rear seat-only cooling switch (40) is for selecting independent cooling of the rear seat area inside the vehicle cabin and is installed as a button on the rear seat controller (50) of the rear seat area, which is installed for air conditioning control of the rear seat area.

[0033] In some cases, the above rear seat-only cooling switch (40) may be installed on both the front seat controller (not shown) of the front seat section and the rear seat controller (50).

[0034] Here, the rear seat-only cooling switch (40) is turned ON and OFF depending on the number of times the user presses it.

[0035] Therefore, it is configured to output an "on signal" or an "off signal" depending on the number of times the user presses.

[0036] If a separate off switch (not shown) is installed on the rear seat controller (50), the rear seat-only cooling switch (40) is turned off even when the separate off switch is operated.

[0037] And the air conditioning device of the present invention is equipped with a control unit (60) that controls the compressor (10), the front seat air conditioning unit (20), and the rear seat air conditioning unit (30) according to a signal from the rear seat-only cooling switch (40).

[0038] The above control unit (60) is equipped with a microprocessor, and when an ON signal is output as the user turns on (0N) the rear seat-only cooling switch (40), it determines whether the vehicle and the outside air condition satisfy at least one of the preset conditions, and determines whether to provide dedicated cooling for the rear seat based on the result of the determination.

[0039] To explain this in more detail, when the control unit (60) receives an ON signal from the rear seat-only cooling switch (40), it determines whether all of the following conditions are satisfied: a first condition that the engine of the vehicle is currently OFF, a second condition that a preset time has elapsed after the engine of the vehicle is OFF, for example, a second condition that one minute has elapsed after the engine is OFF, a third condition that passengers are not seated in the front seats, i.e., the driver's seat and the passenger seat, and passengers are seated only in the rear seats, a fourth condition that the outside air temperature is above a preset temperature, for example, 25°C or higher, and a fifth condition that the relative humidity of the outside air is above a preset humidity, for example, 70% or higher.

[0040] At this time, the reason for determining the first and second conditions above is to restrict exclusive cooling of the rear seat area only when the vehicle is parked for a short time, and the reason for determining the third condition above is to restrict exclusive cooling of the rear seat area only when passengers are seated in the driver's seat and passenger seat of the front seat.

[0041] In addition, the reason for determining the above 4th and 5th conditions is to minimize energy consumption by allowing dedicated cooling of the rear seat area only when the outside temperature and humidity are higher than a preset size.

[0042] In particular, for electric vehicles, this is intended to minimize battery consumption by allowing dedicated cooling for the rear seats only when the outside temperature and humidity are high.

[0043] Here, the first to fifth conditions are based on sensing values ​​input from an outside air temperature sensor, an outside air humidity sensor, a seating detection sensor of each seat, etc., which are installed in the vehicle.

[0044] Meanwhile, the control unit (60) enters the rear seat-only cooling mode (62) when all of the first to fifth conditions are satisfied.

[0045] Then, the control unit (60) that has entered the rear seat-only cooling mode (62) turns on the compressor (10) of the air conditioning unit, controls the variable expansion valve (22) of the front seat air conditioning unit (20) to close completely, turns off the blower (26), and controls the expansion valve (34) and blower (38) of the rear seat air conditioning unit (30) to a preset reference value.

[0046] Accordingly, when entering the rear seat-only cooling mode (62), the air conditioning system is operated, but the operation of the front seat air conditioning unit (20) is restricted, and only the rear seat air conditioning unit (30) is operated.

[0047] Thus, only the rear seat portion of the vehicle interior can be cooled. As a result, the rear seat air conditioning unit (30) can be operated independently without starting the vehicle and turning on the front seat air conditioning unit (20).

[0048] In particular, such as during summer car camping, after turning off the vehicle's engine at the campsite, only the rear passenger compartment can be cooled independently.

[0049] As a result, it is possible to cool the rear passenger compartment of the vehicle at a camping site while minimizing energy consumption, thereby simultaneously promoting interior comfort and improving fuel efficiency.

[0050] Meanwhile, the first condition built into the control unit (60) may further include an auxiliary condition of whether the battery (not shown) is being charged.

[0051] That is, the first condition above may include both detailed conditions, whether the vehicle's ignition is off and whether the battery is being charged.

[0052] Thus, when the first condition of whether the battery is being charged while the vehicle is turned off and the second to fifth conditions are all satisfied, the control unit (60) controls the flow of the compressor (10) and the refrigerant while entering the rear seat-only cooling mode to operate the rear seat air conditioning unit (30) independently.

[0053] And, the above control unit (60) is configured to control the compressor (10), the expansion valve (34) and the blower (38) of the rear air conditioning unit (30) with a preset reference value when entering the rear seat-only cooling mode (62), and then, when the user operates at least one of the rear seat temperature control switch (not shown), the rear seat airflow control switch (not shown), and the discharge mode control switch (not shown) of the rear seat controller (50) to reset the rear seat temperature, the rear seat airflow level, and the rear seat discharge mode, the compressor (10), the expansion valve (34) and the blower (38) of the rear air conditioning unit (30) according to the reset values.

[0054] Accordingly, the rear air conditioning unit (30) is controlled according to the setting value reset by the user, so that the rear seat area can be cooled according to the setting value reset by the user.

[0055] Again, referring to FIG. 2, the control unit (60) is released from the rear seat-only cooling mode (62) when, after entering the rear seat-only cooling mode (62), the user turns off the rear seat-only cooling switch (40) or turns off a separate off switch installed on the rear seat controller (50).

[0056] Then, the control unit (60) released from the rear seat-only cooling mode (62) turns off the compressor (10) of the air conditioning unit and the expansion valve (34) and blower (38) of the rear seat air conditioning unit (30). Thus, the dedicated cooling of the rear seat area is stopped.

[0057] Meanwhile, the above control unit (60) turns off the compressor (10) of the air conditioning system and the expansion valve (34) and blower (38) of the rear air conditioning unit (30) when the user turns on the vehicle engine after entering the rear seat-only cooling mode (62).

[0058] Therefore, when the vehicle is turned on, the dedicated air conditioning for the rear seats is stopped.

[0059] And the control unit (60) determines the occurrence of surface icing on the low-pressure heat exchanger (36) based on the temperature sensing value of the low-pressure heat exchanger (36) input from the low-pressure heat exchanger sensor (not shown) of the rear air conditioning unit (30).

[0060] In particular, it is determined whether the temperature sensing value of the low-pressure side heat exchanger (36) is below a preset reference temperature, and if the result of the determination is below the reference temperature, it is recognized that icing has occurred on the surface of the low-pressure side heat exchanger (36).

[0061] And based on this recognition, the compressor (10) is turned off. Accordingly, the circulation of refrigerant to the low-pressure heat exchanger (36) is restricted, thereby preventing icing from occurring in the low-pressure heat exchanger (36).

[0062] Next, an example of operation of the present invention having such a configuration will be described in detail with reference to FIGS. 2, 3, and 4.

[0063] First, referring to FIGS. 2 and FIGS. 3, when the user turns on (0N) the rear seat-only cooling switch (40) and selects rear seat-only cooling (S101), the control unit (60) determines whether the vehicle's engine is turned off (OFF) (S103).

[0064] If, as a result of the determination, the vehicle's engine is turned off, the control unit (60) determines again whether a preset time has elapsed since the vehicle's engine was turned off (S105). For example, it determines again whether 1 minute has elapsed since the engine was turned off.

[0065] If, as a result of the judgment, 1 minute has elapsed, the control unit (60) determines again whether passengers are not in the front seats and passengers are only in the rear seats (S107).

[0066] If, as a result of the judgment, passengers are only seated in the rear seats, the control unit (60) determines again whether the outside temperature is above a preset temperature (S109). For example, it determines again whether the outside temperature is 25℃ or higher.

[0067] As a result of the judgment, if the outside temperature is 25℃ or higher, the control unit (60) determines again whether the relative humidity of the outside air is higher than a preset humidity (S111). For example, it determines again whether the relative humidity of the outside air is 70% or higher.

[0068] If, as a result of the judgment, the relative humidity of the outside air is 70% or higher, the control unit (60) determines that the current user wants to cool only the rear seat area exclusively and that the vehicle condition and outside air conditions are suitable for cooling exclusively for the rear seat, and enters the cooling mode (62) exclusively for the rear seat (S113).

[0069] Then, the control unit (60) that has entered the rear seat-only cooling mode (62) turns on the compressor (10) of the air conditioning unit as shown in FIG. 4, controls the variable expansion valve (22) of the front seat air conditioning unit (20) to close completely, turns off the blower (26), and also operates the expansion valve (34) and blower (38) of the rear seat air conditioning unit (30) to preset reference values ​​(S115).

[0070] Then, the air conditioning system starts operating, but the operation of the front air conditioning unit (20) is restricted, and only the rear air conditioning unit (30) operates. As a result, only the rear seat area of ​​the vehicle cabin is cooled.

[0071] Meanwhile, when the user operates the rear seat controller (50) to reset the rear seat temperature, rear seat airflow level, and rear seat discharge mode while the rear seat is in the cooling mode (62), the control unit (60) controls the compressor (10), the expansion valve (34), and the blower (38) of the rear seat air conditioning unit (30) according to the reset values.

[0072] Accordingly, the rear air conditioning unit (30) is controlled according to the setting value reset by the user, and the rear seat area is cooled according to the setting value reset by the user.

[0073] And while entering the rear seat-only cooling mode (62), the control unit (60) determines again whether the rear seat-only cooling switch (40) is turned off or the vehicle's engine is turned on (S117).

[0074] If, as a result of the judgment, the rear seat-only cooling switch (40) is turned OFF or the vehicle's engine is turned ON, the control unit (60) is released from the rear seat-only cooling mode (62) (S119).

[0075] Then, the control unit (60) released from the rear seat-only cooling mode (62) turns off both the compressor (10) of the air conditioning unit and the blower (38) of the rear seat air conditioning unit (30) (S121). Then, the dedicated cooling of the rear seat area is stopped.

[0076] According to the air conditioning device of the present invention having such a configuration, a rear-seat-only cooling switch (40) for selecting rear-seat-only cooling is installed, and when a user operates it to select rear-seat-only cooling, the refrigerant flow of the air conditioning device is controlled regardless of whether the vehicle's engine is off, thereby operating only the rear-seat air conditioning unit (30). Therefore, the rear-seat air conditioning unit (30) can be operated independently without turning on the vehicle's engine and the front-seat air conditioning unit (20).

[0077] In particular, such as during summer car camping, after turning off the engine of the vehicle at the car camping site, the rear air conditioning unit (30) can be operated independently.

[0078] In addition, since the rear air conditioning unit (30) can be operated independently after turning off the engine of the vehicle at the campsite, it is possible to cool the rear seat area inside the vehicle at the campsite while minimizing energy consumption.

[0079] In addition, since it is possible to cool the rear passenger compartment at a car camping site while minimizing energy consumption, it is possible to simultaneously achieve interior comfort and improve the vehicle's fuel efficiency and energy efficiency.

[0080] Although preferred embodiments of the present invention have been described illustratively above, the scope of the present invention is not limited to such specific embodiments and can be appropriately modified within the scope described in the claims. Explanation of the symbols

[0081] 10: Compressor 12: High-pressure side heat exchanger 20: Front-seat air conditioning unit 22: Expansion valve 24: Low-pressure heat exchanger 26: Blower 30: Rear air conditioning unit 32: Bypass line 34: Expansion valve 36: Low-pressure side heat exchanger 38: Blower 40: Rear seat cooling switch 50: Rear Seat Controller 60: Control Unit 62: Rear-seat only cooling mode

Claims

Claim 1 A vehicle air conditioning system comprising a front seat air conditioning unit for cooling and heating the front seat portion of the vehicle interior and a rear seat air conditioning unit for cooling the rear seat portion of the vehicle interior, wherein the system includes a control unit that determines whether the vehicle and outside air conditions satisfy at least one preset condition, and when the preset condition is satisfied, enters a rear seat-only cooling mode and controls the flow of the compressor and refrigerant to operate the rear seat air conditioning unit independently; wherein, when a user operates a rear seat-only cooling switch to select cooling for the rear seat portion independently, the control unit enters the rear seat-only cooling mode and, when all of the following conditions are satisfied: a first condition that the vehicle engine is currently off; a second condition that a preset time has elapsed after the vehicle engine is off; a third condition that passengers are not seated in the driver's seat and passenger seat of the front seat, and passengers are seated only in the rear seat; a fourth condition that the outside air temperature is above a preset temperature; and a fifth condition that the relative humidity of the outside air is above a preset humidity, the control unit A vehicle air conditioning system characterized by controlling the flow of the compressor and refrigerant to operate the rear air conditioning unit independently. Claim 2 delete Claim 3 A vehicle air conditioning device according to claim 1, wherein the expansion valves of the front seat air conditioning unit and the rear seat air conditioning unit are variable solenoid valves in which the opening amount of the throttling passage is variably adjusted according to the magnitude of the applied voltage; and wherein the control unit, upon entering the rear seat-only cooling mode, turns on the compressor to a preset reference value and controls the variable expansion valve of the front seat air conditioning unit to be completely closed, and also controls the expansion valve and blower of the rear seat air conditioning unit to a preset reference value. Claim 4 A vehicle air conditioning device according to claim 3, further comprising a rear seat controller installed to control the rear seat air conditioning unit; wherein the control unit enters the rear seat-only cooling mode and controls the compressor and the rear seat air conditioning unit with a preset reference value, and then, when a user operates the rear seat controller to reset the rear seat temperature, rear seat airflow level, and rear seat discharge mode, controls the compressor and the rear seat air conditioning unit according to the reset values ​​so that the temperature, discharge airflow, and airflow direction of the rear seat portion can be controlled in accordance with the control values ​​reset by the user. Claim 5 A vehicle air conditioning device according to claim 4, wherein the control unit, after entering the rear seat-only cooling mode, turns off the rear seat-only cooling switch when the user turns it off, thereby releasing from the rear seat-only cooling mode and turning off both the compressor and the rear seat air conditioning unit to stop the dedicated cooling of the rear seat area. Claim 6 A vehicle air conditioning device according to claim 5, wherein the control unit, when the user turns on the vehicle ignition after entering the rear seat-only cooling mode, is released from the rear seat-only cooling mode and turns off both the compressor and the rear seat air conditioning unit, thereby stopping the dedicated cooling of the rear seat area. Claim 7 A vehicle air conditioning device characterized in that, in any one of claims 1, 3 to 6, the rear seat-only cooling switch is installed as a button on a rear seat controller installed in the rear seat portion to control the rear seat air conditioning unit. Claim 8 In claim 7, the above-mentioned rear seat-only cooling switch is characterized by being installed as a button on a front seat controller installed in the front seat portion to control the above-mentioned front seat air conditioning unit. Claim 9 A vehicle air conditioning device according to claim 1, wherein the first condition further includes an auxiliary condition of whether the battery is in a charging state; and wherein the control unit controls the flow of the compressor and refrigerant to operate the rear air conditioning unit independently while entering the rear-seat-only cooling mode when the first condition of whether the battery is in a charging state with the vehicle's ignition off and the second to fifth conditions are all satisfied. Claim 10 A vehicle air conditioning device according to any one of claims 1, 3 to 4, wherein the control unit determines the occurrence of surface icing of the low-pressure heat exchanger based on the temperature sensing value of the low-pressure heat exchanger input from the low-pressure heat exchanger sensor of the rear seat air conditioning unit, and if the occurrence of surface icing of the low-pressure heat exchanger is confirmed as a result of the determination, the compressor is turned off.

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