Vehicle air conditioning system

Abstract

The objective is to provide a vehicle air conditioning system that promotes surface heat dissipation of electronic devices located beneath the vehicle's seats. [Solution] The vehicle air conditioning system 20 includes an air conditioning unit 26 capable of changing the direction of air conditioning airflow, an intake and exhaust unit 28 provided in the rear seat 17 of the vehicle 10, a temperature detection unit that detects the temperature of a refrigerant that cools a power supply unit 29 provided at the bottom of the seat cushion 17B of the rear seat 17, and a control unit that controls the air conditioning unit 26 to change the direction of air conditioning airflow toward the rear seat 17 when the temperature of the refrigerant detected by the temperature detection unit is above a predetermined value, and controls the intake and exhaust unit 28 to draw air from the surface of the seat cushion 17B into the interior of the seat cushion 17B and discharge it to the bottom of the seat cushion 17B.

Description

Technical Field

[0001] The disclosed technology relates to a vehicle air conditioning system.

Background Art

[0002] Patent Document 1 discloses an electric vehicle in which an electrical component unit (i.e., an electronic device) is provided behind the seat.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the electric vehicle described in Patent Document 1, an electrical component unit (i.e., an electronic device) was installed behind the vehicle seat. However, when the electronic device is installed under the seat, the upper surface of the electronic device is covered by the seat, so cooling by surface heat radiation from the upper surface of the electronic device cannot be expected, and there is room for improvement in the cooling mechanism for cooling the electronic device.

[0005] An object of the disclosed technology is to provide a vehicle air conditioning system that promotes surface heat radiation of an electronic device provided under a vehicle seat.

Means for Solving the Problems

[0006] The vehicle air conditioning system according to claim 1 comprises: an air conditioning unit capable of changing the direction of air conditioning air blown out from an air outlet facing the passenger compartment of the vehicle; a seat ventilator provided in the rear seat of the vehicle; a temperature detection unit for detecting the temperature of a refrigerant that cools electronic equipment provided in the lower part of the seat cushion of the rear seat; and a control unit that, when the temperature of the refrigerant detected by the temperature detection unit is above a predetermined value, controls the air conditioning unit to change the direction of air conditioning air blown out toward the rear seat, and controls the seat ventilator to draw air on the surface of the seat cushion into the interior of the seat cushion and discharge it toward the lower part of the seat cushion.

[0007] According to the vehicle air conditioning system described in claim 1, when the temperature of the refrigerant used to cool the electronic equipment is above a predetermined value, the conditioned air blown toward the rear seats can be delivered through the seat cushions of the rear seats to the electronic equipment located beneath the seat cushions. This promotes surface heat dissipation of the electronic equipment located beneath the vehicle seats.

[0008] The vehicle air conditioning system according to claim 2 is the vehicle air conditioning system according to claim 1, further comprising a seat detection unit that detects whether or not an occupant is seated in the rear seat, and the control unit controls the seat ventilator to change the strength of the air intake according to whether or not an occupant is seated in the rear seat as detected by the seat detection unit. According to the vehicle air conditioning system according to claim 2, the strength of the seat ventilator can be changed according to the situation, so that a balance can be struck between the comfort of the occupant seated in the rear seat and the cooling efficiency of electronic equipment.

[0009] The vehicle air conditioning system according to claim 3 is the vehicle air conditioning system according to claim 2, wherein the control unit controls the seat ventilator to increase the strength of air intake when it detects that no occupant is seated in the rear seat. According to the vehicle air conditioning system according to claim 3, the cooling efficiency of electronic equipment can be increased when no occupant is seated in the rear seat.

[0010] The vehicle air conditioning system according to claim 4 is the vehicle air conditioning system according to claim 2 or claim 3, wherein the seat detection unit detects whether or not an occupant is seated in the passenger seat of the vehicle, and the control unit controls the air conditioning unit to change the direction of air conditioning airflow and the intensity of the air conditioning airflow depending on whether or not an occupant is seated in the passenger seat. According to the vehicle air conditioning system according to claim 4, the direction of air conditioning airflow can be changed according to the situation, so that a balance can be struck between the comfort of the occupant seated in the passenger seat and the cooling efficiency of electronic equipment.

[0011] The vehicle air conditioning system according to claim 5 is the vehicle air conditioning system according to claim 4, wherein the control unit, when it detects that no occupant is seated in the passenger seat, changes the direction of the air conditioning airflow upwards towards the passenger seat and controls the air conditioning unit to increase the intensity of the airflow. According to the vehicle air conditioning system according to claim 5, when no occupant is seated in the passenger seat, the cooling efficiency of electronic equipment can be increased. [Effects of the Invention]

[0012] According to the disclosed technology, surface heat dissipation of electronic devices located beneath a vehicle seat can be promoted. [Brief explanation of the drawing]

[0013] [Figure 1] This figure shows a simplified representation of the vehicle air conditioning system according to this embodiment. [Figure 2] This is a block diagram showing an example of the schematic configuration of a vehicle air conditioning system according to this embodiment. [Figure 3] A block diagram showing an example of the functional configuration of the control device according to this embodiment. [Figure 4] This flowchart shows an example of the startup process flow according to this embodiment. [Modes for carrying out the invention]

[0014] The vehicle air conditioning system 20 according to this embodiment will be described with reference to Figures 1 to 4. Figure 1 shows a simplified representation of the vehicle air conditioning system 20 according to this embodiment. Figure 2 shows a block diagram illustrating an example of the schematic configuration of the vehicle air conditioning system 20 according to this embodiment. In Figure 1, arrow FR indicates the front side of the vehicle, and arrow UP indicates the upper side of the vehicle.

[0015] (Hardware configuration) As shown in Figure 1, the vehicle air conditioning system 20 is mounted on the vehicle 10. The vehicle air conditioning system 20 is composed of an air conditioning unit 26 and an intake / exhaust unit 28. Note that Figure 1 shows only a part of the vehicle 10 in order to explain the vehicle air conditioning system 20 of this embodiment. The intake / exhaust unit 28 is an example of a "seat ventilator".

[0016] Vehicle 10 is, for example, a battery electric vehicle (BEV) equipped with two rows of seats and has multiple seats. The seats include a front seat 16 and a rear seat 17. Vehicle 10 also has an Electricity Supply Unit (ESU) 29 located below the rear seat 17. In this embodiment, the front seat 16 is described as the passenger seat and the rear seat 17 as the rear passenger seat, but it is not limited to this.

[0017] The rear seat 17, which has a power supply unit 29 located at its lower part, is installed higher than the front seat 16 within the vehicle compartment 12. The front seat 16 and the rear seat 17 may be installed at the same height.

[0018] The power supply unit 29 is an electronic device that supplies power from an external power source to a battery (not shown). Further, the power supply unit 29 is installed at the lower part of the seat cushion 17B of the rear seat 17. And the power supply unit 29 includes a cooling device 60 (see FIG. 2) that cools the power supply unit 29 itself. The cooling device 60 can cool the power supply unit 29 by circulating cooling water through a cooling water circuit provided inside the power supply unit 29 as an example.

[0019] The air conditioning unit 26 can perform air conditioning by blowing conditioned air into the passenger compartment 12 from an air outlet 14A facing the passenger compartment 12 side. The air outlet 14A is formed in an instrument panel 14 disposed at the front of the passenger compartment 12 as an example. Also, in the passenger compartment 12, the front surface of the seat back 16A of the front seat 16 is disposed on the side facing the air outlet 14A.

[0020] Further, the air conditioning unit 26 can control the blowing direction of the conditioned air by changing the direction of the louver of an electric register 26A (see FIG. 2) provided at the air outlet 14A. The air conditioning unit 26 controls, for example, so that the blowing direction of the conditioned air is in the direction of the passenger of the front seat 16 (see arrow W1). Also, the air conditioning unit 26 controls so that the blowing direction of the conditioned air is at the upper part of the seat back 16A (see arrow W2).

[0021] Also, the air conditioning unit 26 can change the volume of the conditioned air. The air conditioning unit 26 can change the volume of the conditioned air in five steps by adjusting the output of a blower (not shown) provided inside the air conditioning unit 26 as an example. The steps of the volume can be changed from "0" indicating the stage where the blower is in a standby state (i.e., no wind) to "4" indicating the stage where the volume is maximum.

[0022] The intake and exhaust part 28 is also referred to as a seat ventilation system (hereinafter referred to as SVS). The intake and exhaust part 28 of the present embodiment is disposed inside the seat cushion 17B of the rear seat 17, and is capable of sucking the air on the surface of the seat cushion 17B into the seat cushion 17B (see arrow W3). As an example, the intake and exhaust part 28 includes a blower (not shown) disposed inside the seat cushion 17B. Further, the skin of the rear seat 17 is made ventilable, and a flow path is formed between the inner surface side of the skin of the rear seat 17 and the arrangement region of the blower. Thereby, when the blower operates, air is sucked from the surface of the seat cushion 17B of the rear seat 17 into the seat cushion 17B. Also, the air sucked by the intake and exhaust part 28 is discharged to the lower part of the seat cushion 17B (see arrow W4). Note that the intake and exhaust part 28 may discharge the air sucked from the lower part of the seat cushion 17B onto the surface of the seat cushion 17B.

[0023] Also, the intake and exhaust part 28 is capable of changing the output of intake and exhaust. The intake and exhaust part 28 can be set to, for example, a low output mode (hereinafter also referred to as Lo mode) and a high output mode (hereinafter also referred to as Hi mode).

[0024] FIG. 2 shows an example of the schematic configuration of the control device 40 according to the present embodiment and the components connected to the control device 40. The control device 40 is, for example, an air conditioning ECU (Electronic Control Unit). The control device 40 includes a CPU (Central Processing Unit: processor) 42, a RAM (Random Access Memory) 44, a ROM (Read Only Memory) 46, and an input / output interface section (I / O) 50, and these are communicably connected to each other via a bus 52. The control device 40 is an example of a "control section".

[0025] The CPU 42 executes various programs and controls each part (device) connected to the control device 40 and performs various calculations according to the programs. The ROM 46 is a non-volatile memory unit, and various programs such as the control program 48 and various data are stored in the ROM 46. The RAM 44 temporarily stores various data such as the angle information of the louvers of the electric register 26A that indicates the direction of air conditioning airflow, and the air conditioning airflow volume setting, and is also used as a working area for programs. The I / O 50 communicates with external devices. The air conditioning unit 26, intake and exhaust unit 28, temperature sensor 30, and seat sensor 32 are connected to the I / O 50. In the control device 40, the CPU 42 reads the control program 48 from the ROM 46 and executes the control program 48 using the RAM 44 as a working area. The temperature sensor 30 is an example of a "temperature detection unit". The seat sensor 32 is an example of a "seat detection unit".

[0026] The temperature sensor 30 is a sensor that detects the temperature of the refrigerant in the cooling device 60. For example, the temperature sensor 30 detects the temperature of the cooling water circulating in the cooling water circuit of the cooling device 60 that cools the power supply unit 29 and outputs it to the control device 40.

[0027] The seating sensor 32 is a piezoelectric sensor installed in the seat cushion of a vehicle seat, which turns on when a load is generated when an occupant sits down. The seating sensor 32 is installed, for example, in the seat cushion 16B of the front seat 16 and the seat cushion 17B of the rear seat 17. The seating sensor 32 detects the presence or absence of load on the seat cushions 16B and 17B and outputs a signal to the control device 40. The seating sensor 32 may also be a sensor that detects the presence or absence of an occupant from images of the vehicle interior, etc.

[0028] (Functional Configuration) Figure 3 is a block diagram showing an example of the functional configuration of the control device 40 according to this embodiment. In this embodiment, the control device 40 functions as a detection unit 42A, a determination unit 42B, and a drive control unit 42C when the CPU 42 executes the control program 48.

[0029] The detection unit 42A has the function of detecting when the temperature of the refrigerant reaches a predetermined temperature or a predetermined value. Specifically, the detection unit 42A acquires the temperature of the cooling water output from the temperature sensor 30 and detects whether the acquired temperature is above a preset temperature.

[0030] The determination unit 42B has the function of determining whether or not an occupant is seated in a vehicle seat. Specifically, the determination unit 42B determines whether or not an occupant is seated in the front seat 16 and the rear seat 17 based on the signal output from the seating sensor 32.

[0031] Furthermore, the determination unit 42B has a function to determine whether or not the direction of the air conditioning airflow is towards the occupant. Specifically, the determination unit 42B determines whether or not the angle of the louvers of the electric register 26A provided at the air outlet 14A is within the range of angles that indicate the direction of an occupant seated in a vehicle seat.

[0032] The drive control unit 42C has the function of controlling the direction and volume of the air conditioning airflow. Specifically, the drive control unit 42C controls the direction of the air conditioning airflow by controlling the orientation of the louvers of the electric register 26A provided at the air outlet 14A. The drive control unit 42C also controls the volume of airflow by controlling the output of the blower installed inside the air conditioning unit 26.

[0033] Furthermore, the drive control unit 42C has the function of activating the intake and exhaust unit 28 and controlling the intake and exhaust output of the intake and exhaust unit 28. Specifically, the drive control unit 42C activates a blower located inside the seat cushion and controls the output of the blower.

[0034] (action) Next, as an example of the operation of this embodiment, the startup process executed by the CPU 42 (see Figure 2) in a vehicle 10 equipped with the vehicle air conditioning system 20 will be explained with reference to the flowchart shown in Figure 4. The startup process is, for example, a process that is executed while the vehicle 10 is in motion.

[0035] In step S100 of Figure 4, the CPU 42 detects that the temperature of the cooling water has risen above a preset temperature. Specifically, the CPU 42 detects, based on the signal output from the temperature sensor 30, that the cooling water in the cooling device 60 that cools the power supply unit 29 has risen above a preset temperature. In other words, the CPU 42 executes the processes from step S101 onwards when it detects that the temperature of the cooling water has risen above a preset temperature while the vehicle 10 is running.

[0036] In step S101, the CPU 42 determines whether or not an occupant is seated in the front seat 16. Specifically, the CPU 42 determines whether or not it has detected a load on the seat cushion 16B of the front seat 16. If the CPU 42 determines that an occupant is seated in the front seat 16 (step S101: YES), it proceeds to step S102. On the other hand, if the CPU 42 determines that no occupant is seated in the front seat 16 (step S101: NO), it proceeds to step S110.

[0037] In step S102, the CPU 42 determines whether the direction of airflow is towards the occupant of the front seat 16. Specifically, the CPU 42 determines whether the angle of the louvers of the electric register 26A provided on the air outlet 14A is towards the occupant seated in the front seat 16 (for example, arrow W1 in Figure 1). If the CPU 42 determines that the direction of airflow is towards the occupant of the front seat 16 (step S102: YES), the process proceeds to step S103. On the other hand, if the CPU 42 determines that the direction of airflow is not towards the occupant of the front seat 16 (step S102: NO), the process proceeds to step S110.

[0038] In step S103, the CPU 42 determines whether or not an occupant is seated in the rear seat 17. Specifically, the CPU 42 determines whether or not it has detected a load on the seat cushion 17B of the rear seat 17. If the CPU 42 determines that an occupant is seated in the rear seat 17 (step S103: YES), it proceeds to step S104. On the other hand, if the CPU 42 determines that no occupant is seated in the rear seat 17 (step S103: NO), it proceeds to step S106.

[0039] In step S104, the CPU 42 controls the changes in the direction and volume of the airflow to be small. Specifically, the CPU 42 slightly changes the direction of the air-conditioned airflow from the direction of the occupants of the front seats 16 to the direction of the rear seats 17, and controls the air conditioning unit 26 to slightly increase the volume of the air-conditioned airflow from the original volume. Here, a slight change in the direction of the airflow means, for example, changing the direction of the airflow upwards so that the air-conditioned air still hits the occupants seated in the front seats 16 even after the change in the direction of the airflow. Also, slightly increasing the volume means, for example, changing the original volume level to "2" to "3", which is one level higher. In this way, by changing the direction of the airflow upwards and increasing the volume, the amount of air-conditioned air that flows over the seat back 16A towards the rear seats 17 can be increased.

[0040] In step S105, the CPU 42 starts the intake and exhaust unit 28 of the rear seat 17 in Lo mode. Specifically, the CPU 42 controls the intake and exhaust unit 28, which is located inside the seat cushion 17B of the rear seat 17, to start in Lo mode. Then, the CPU 42 terminates the startup process.

[0041] In step S106, the CPU 42 controls the changes in the discharge direction and airflow to be small. Since step S106 is the same process as step S104, a detailed explanation is omitted.

[0042] In step S107, the CPU 42 activates the intake and exhaust unit 28 of the rear seat 17 in Hi mode. Specifically, the CPU 42 controls the intake and exhaust unit 28, which is located inside the seat cushion 17B of the rear seat 17, to activate in Hi mode. Then, the CPU 42 terminates the activation process.

[0043] In step S110, the CPU 42 determines whether or not an occupant is seated in the rear seat 17. Specifically, the CPU 42 determines whether or not it has detected a load on the seat cushion 17B of the rear seat 17. If the CPU 42 determines that an occupant is seated in the rear seat 17 (step S110: YES), it proceeds to step S111. On the other hand, if the CPU 42 determines that no occupant is seated in the rear seat 17 (step S110: NO), it proceeds to step S113.

[0044] In step S111, the CPU 42 significantly controls the changes in the direction and volume of the airflow. Specifically, the CPU 42 significantly changes the direction of the air-conditioned airflow from the direction of the occupants of the front seats 16 to the direction of the rear seats 17, and controls the air conditioning unit 26 to significantly increase the volume of the air-conditioned airflow from the original volume. Here, a significant change in the direction of the airflow means, for example, changing the direction of the airflow to the one that maximizes the elevation angle within the range of adjustable airflow direction (for example, arrow W2 in Figure 1). Furthermore, significantly increasing the volume means, for example, changing the original volume level to "2" to the maximum volume level, "4". In this way, by changing the direction of the airflow as far upward as possible and maximizing the volume, the amount of air-conditioned air flowing over the seat back 16A towards the rear seats 17 can be increased.

[0045] In step S112, the CPU 42 starts the intake and exhaust unit 28 of the rear seat 17 in Lo mode. Specifically, the CPU 42 controls the intake and exhaust unit 28, which is located inside the seat cushion 17B of the rear seat 17, to start in Lo mode. Then, the CPU 42 terminates the startup process.

[0046] In step S113, the CPU 42 significantly controls the changes in the direction and volume of the airflow. Since step S113 is the same process as step S111, a detailed explanation is omitted.

[0047] In step S114, the CPU 42 activates the intake and exhaust unit 28 of the rear seat 17 in Hi mode. Specifically, the CPU 42 controls the intake and exhaust unit 28, which is located inside the seat cushion 17B of the rear seat 17, to activate in Hi mode. Then, the CPU 42 terminates the activation process.

[0048] Furthermore, if the CPU 42 detects that the cooling water temperature has fallen below a preset temperature after executing the startup process described above, it may return the state of the air conditioning unit 26 and the intake / exhaust unit 28 to the state they were in before the startup process was executed.

[0049] (Summary of this embodiment) In this embodiment, the vehicle air conditioning system 20, when it is detected by the temperature sensor 30 that the temperature of the coolant cooling the power supply unit 29 has risen above a preset temperature, controls the air conditioning unit 26 so that the direction of the air conditioning airflow is toward the rear seat 17, and controls the intake and exhaust unit 28 so that the air inside the passenger compartment 12 is discharged to the lower part of the seat cushion 17B. Therefore, according to this embodiment, the vehicle air conditioning system 20 can promote surface heat dissipation of the power supply unit 29 located beneath the vehicle seat.

[0050] In this embodiment, the vehicle air conditioning system 20 changes the intake and exhaust output of the intake and exhaust unit 28 depending on whether or not an occupant is seated in the rear seat 17, as detected by the seating sensor 32. Therefore, with the vehicle air conditioning system 20 of this embodiment, it is possible to balance the comfort of the occupant seated in the rear seat 17 with the cooling efficiency of the power supply unit 29.

[0051] In this embodiment, the vehicle air conditioning system 20 activates the intake and exhaust unit 28 in Hi mode when it is determined that no occupants are seated in the rear seat 17. Therefore, according to the vehicle air conditioning system 20 of this embodiment, the cooling efficiency of the power supply unit 29 can be increased when no occupants are seated in the rear seat 17.

[0052] In this embodiment, the vehicle air conditioning system 20 changes the direction and volume of the conditioned air blown out from the air conditioning unit 26 depending on whether or not an occupant is seated in the front seat 16, as detected by the seating sensor 32. Therefore, the vehicle air conditioning system 20 of this embodiment can balance the comfort of the occupant seated in the front seat 16 with the cooling efficiency of the power supply unit 29.

[0053] In this embodiment, the vehicle air conditioning system 20, when it is determined that no occupant is seated in the front seat 16, significantly changes the direction of the air conditioning airflow from the direction of the passenger seat occupant to the direction of the rear seat 17, and controls the air conditioning unit 26 to significantly increase the airflow volume from the original volume. Therefore, according to the vehicle air conditioning system 20 of this embodiment, when no occupant is seated in the front seat 16, the cooling efficiency of the power supply unit 29 can be increased.

[0054] [Other embodiments] In this embodiment, the vehicle air conditioning system 20 changed the direction of air conditioning airflow from the air conditioning unit 26 upwards when changing the direction of air conditioning airflow towards the rear seat 17. However, the vehicle air conditioning system 20 is not limited to this, and the vehicle air conditioning system 20 in this embodiment may change the direction of air conditioning airflow from the air conditioning unit 26 to the left and right directions of the seat back 16A. Therefore, according to the vehicle air conditioning system 20 in this embodiment, the amount of air conditioning air flowing towards the rear seat 17 by passing along the sides of the seat back 16A can be increased.

[0055] In addition, the startup process in which the CPU 42 reads and executes the software (program) in the above embodiment may be executed by various processors other than the CPU. Examples of such processors include FPGAs (Field-Programmable Gate Arrays) and other PLDs (Programmable Logic Devices) whose circuit configuration can be changed after manufacturing, and dedicated electrical circuits such as ASICs (Application Specific Integrated Circuits) which have a circuit configuration specifically designed to execute a particular process. Furthermore, the startup process may be executed by one of these various processors, or by two or more processors of the same or different types. It may also be implemented using a combination of FPGAs (for example, multiple FPGAs, and a combination of a CPU and an FPGA). More specifically, the hardware structure of these various processors is an electrical circuit made up of circuit elements such as semiconductor elements.

[0056] Furthermore, although the above embodiment describes a configuration in which the program is pre-stored (installed) in ROM46, the invention is not limited thereto. The program may be provided in a form recorded on a recording medium such as a CD-ROM (Compact Disk Read Only Memory), DVD-ROM (Digital Versatile Disk Read Only Memory), or USB (Universal Serial Bus) memory. Alternatively, the program may be provided in a form that can be downloaded from an external device via a network. The technology disclosed herein is also applicable to programs and program products. [Explanation of symbols]

[0057] 10 vehicles 12 Cabin 14A Air outlet 16 Front seat (passenger seat) 17. Rear seats 17B Seat Cushion 20. Vehicle air conditioning systems 26. Air Conditioning Department 28. Intake and exhaust section (seat ventilator) 29 Power supply unit (electronic equipment) 30. Temperature sensor (temperature detection unit) 32. Seat sensor (seat detection unit) 40 Control device (control unit) 42A Detection Unit 42B Judgment section 42C Drive Control Unit

Claims

1. An air conditioning unit that can change the direction of the conditioned air blown out from an air outlet facing the passenger compartment of the vehicle, A seat ventilator is provided in the rear seat of the aforementioned vehicle, A temperature detection unit for detecting the temperature of the refrigerant used to cool electronic equipment, located at the bottom of the rear seat cushion, A control unit controls the air conditioning unit to change the direction of the air conditioning airflow towards the rear seats when the temperature of the refrigerant detected by the temperature sensing unit is above a predetermined value, and controls the seat ventilator to draw air from the surface of the seat cushion into the interior of the seat cushion and discharge it to the bottom of the seat cushion. A vehicle air conditioning system equipped with the following features.

2. It includes a seating detection unit that detects whether or not an occupant is seated in the rear seat, The control unit controls the seat ventilator to change the intensity of air intake according to whether or not an occupant is seated in the rear seat as detected by the seating detection unit. The vehicle air conditioning system according to claim 1.

3. The control unit, when it detects that no occupant is seated in the rear seat, controls the seat ventilator to increase the intensity of air intake. The vehicle air conditioning system according to claim 2.

4. The seating detection unit detects whether or not an occupant is seated in the passenger seat of the vehicle. The control unit controls the air conditioning unit to change the direction of the air conditioning airflow and the intensity of the airflow depending on whether or not an occupant is seated in the passenger seat as detected by the seating detection unit. The vehicle air conditioning system according to claim 2 or claim 3.

5. When the control unit detects that no occupant is seated in the passenger seat, it changes the direction of the air conditioning airflow upwards towards the passenger seat and controls the air conditioning unit to increase the intensity of the airflow. The vehicle air conditioning system according to claim 4.

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