Vehicle air conditioning system

Abstract

This invention provides a vehicle air conditioning system that can more efficiently regenerate the adsorbent material of a humidity control device while utilizing power from an external power source. [Solution] The vehicle air conditioning system 1 comprises a humidity control device 2 having an adsorption unit 20 and a heating means 21, a duct 3 having a first flow path 31 and a second flow path 32, a valve 4, a blower 5, and a control unit 6 that controls the humidity control device 2, the valve 4 and the blower 5. The control modes of the control unit 6 include an adsorption mode in which the blower 5 is activated without activating the heating means 21 and air 10 is introduced into the first flow path 31, and a regeneration mode in which the blower 5 and the heating means 21 are activated and air is introduced into the second flow path 32. The control unit 6 performs the regeneration mode when the following conditions (1) and (2) are met. (1) The vehicle is connected to an external power source. (2) Radio waves are received from an electronic key held by the vehicle user, or there is an occupant inside the vehicle.

Description

[Technical Field]

[0001] This invention relates to an air conditioning system for vehicles. [Background technology]

[0002] Conventional vehicle air conditioning systems of this type include, for example, the configuration shown in Patent Document 1 below. Patent Document 1 discloses "an in-vehicle air conditioning system for an electric vehicle that runs using stored electricity as the main power source for an electric motor, in which a plurality of dehumidifying units containing a dehumidifying material that generates moisture absorption are arranged inside the vehicle body, characterized in that, mainly at night when the battery is being charged, warm air is produced using electricity in parallel, and the dehumidifying material in the dehumidifying unit is heated and regenerated by the warm air." [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2011-121516 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] If the heating of the adsorbent is stopped, the adsorbent (dehumidifier) ​​may adsorb moisture even without actively supplying air to the humidity control device (dehumidification unit). In the conventional configuration described above, it is proposed to heat and regenerate the adsorbent in the humidity control device when the battery is charged. However, if there is a time lag between the heating and regeneration of the adsorbent and the vehicle being driven, the adsorbent may adsorb a large amount of moisture by the time the vehicle is driven, and there is a risk that the adsorbent will need to be regenerated again when the vehicle is driven. In other words, in the conventional configuration, there is a risk that useless adsorbent will be regenerated.

[0005] This invention was made to solve the above-mentioned problems, and one of its objectives is to provide a vehicle air conditioning system that can more efficiently regenerate the adsorbent material of a humidity control device while utilizing power from an external power source. [Means for solving the problem]

[0006] The inventors of the present invention have diligently researched vehicle air conditioning systems equipped with a humidity control device and have found that the above problems can be solved by connecting an external power source to the vehicle and by regenerating the adsorbent material of the humidity control device when there are occupants near the vehicle or inside the vehicle. This led to the completion of the present invention.

[0007] [1] In one embodiment, the present invention includes a humidity control device having an adsorption section containing an adsorption material that adsorbs moisture at a predetermined temperature or below and desorbs the adsorbed moisture when the predetermined temperature is exceeded, and a heating means capable of heating the adsorption section; a duct in which the humidity control device is disposed and air from the vehicle's cabin or outside the vehicle can flow, the duct having a first flow path for introducing the air into the cabin and a second flow path for discharging the air outside the vehicle downstream of the humidity control device; a valve capable of switching the airflow between the first flow path and the second flow path; and a blower for supplying the air to the humidity control device. The present invention relates to a vehicle air conditioning system comprising a control unit that controls the humidity control device, the valve, and the blower, wherein the control modes of the control unit include an adsorption mode in which the blower is activated without activating the heating means and the air is introduced into the first flow path, and a regeneration mode in which the blower and the heating means are activated and the air is introduced into the second flow path, and the control unit performs the regeneration mode when the following (1) and (2) are satisfied: (1) an external power supply is connected to the vehicle, and (2) radio waves are received from an electronic key held by the user of the vehicle or there are occupants in the vehicle compartment.

[0008] [2] The present invention may also relate to the vehicle air conditioning system described in paragraph 1, wherein the control unit determines whether (1) and (2) are satisfied when the vehicle's power mode is OFF.

[0009] [3] The present invention may relate to a vehicle air conditioning system according to paragraph 1 or 2, wherein the control unit determines whether (1) and (2) are satisfied when the vehicle's power mode is ACC or ON.

[0010] [4] The present invention may relate to a vehicle air conditioning system according to any one of paragraphs 1 to 3, wherein the control unit performs the regeneration mode when (1) and (2) are satisfied but (3) below is not satisfied, and performs the regeneration mode and the adsorption mode alternately when (1) and (2) in addition to (3) below is satisfied, (3) the humidity inside the vehicle is above a predetermined threshold.

[0011] [5] The present invention may relate to a vehicle air conditioning system according to any one of paragraphs 1 to 4, wherein the adsorption portion comprises a honeycomb structure having an outer wall and partition walls disposed inside the outer wall and partitioning cells that form the air passage extending from a first end face to a second end face, and an adsorption layer containing the adsorbent provided on the surface of the partition walls, the heating means comprising a pair of electrodes connected to the honeycomb structure, and heating the honeycomb structure by passing an electric current through the pair of electrodes to the honeycomb structure, and the honeycomb structure is made of a material having PTC properties, at least the partition walls of which are made of a material. [Effects of the Invention]

[0012] According to one embodiment of the vehicle air conditioning system of the present invention, the control unit performs a regeneration mode when the above conditions (1) and (2) are met, so that the regeneration of the adsorbent material of the humidity control device can be performed more efficiently while utilizing power from an external power source. [Brief explanation of the drawing]

[0013] [Figure 1] It is a schematic diagram showing a vehicle air conditioning system according to an embodiment of the present invention. [Figure 2] It is a front view showing the humidity control device of FIG. 1. [Figure 3] It is a right side view showing the humidity control device of FIG. 2. [Figure 4] It is an enlarged view showing an enlarged area IV of FIG. 2.

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to each embodiment, and components can be deformed and embodied without departing from the gist thereof. Also, various inventions can be formed by appropriately combining a plurality of components disclosed in each embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, components of different embodiments may be appropriately combined.

[0015] (1. About the vehicle air conditioning system) FIG. 1 is a schematic diagram showing a vehicle air conditioning system 1 according to an embodiment of the present invention. The vehicle air conditioning system 1 of the present embodiment is a system mounted on a vehicle. As the vehicle, for example, those to which an external power source such as an electric vehicle and a plug-in hybrid vehicle is connected are intended. The external power source is constituted by, for example, a commercial power source or the like, and can be connected to the vehicle to charge a driving battery mounted on the vehicle. The driving battery can supply electric power to a driving motor that rotationally drives wheels when the vehicle is running.

[0016] As shown in FIG. 1, the vehicle air conditioning system 1 has a humidity control device 2, a duct 3, a valve 4, a blower 5, and a control unit 6.

[0017] The humidity control device 2 has an adsorption section 20 and a heating means 21. The adsorption section 20 contains an adsorbent that adsorbs moisture at a predetermined temperature or below, and releases the adsorbed moisture when the temperature exceeds the predetermined temperature. The heating means 21 is configured to heat the adsorption section 20. By heating the adsorption section 20 with the heating means 21, moisture is released from the adsorbent in the adsorption section 20.

[0018] Duct 3 is a pipe in which a humidity control device 2 is arranged inside. Duct 3 is configured to allow air 10 from the vehicle's passenger compartment or from outside the vehicle to flow through. Downstream of the humidity control device 2, Duct 3 has a first passage 31 and a second passage 32. The first passage 31 is a passage for allowing the air 10 that has passed through the humidity control device 2 to flow into the passenger compartment. The second passage 32 is a passage for discharging the air 10 that has passed through the humidity control device 2 to the outside of the vehicle. The first passage 31 and the second passage 32 are separated from each other by a duct partition wall 33. Although not shown in the figures, the first passage 31 and the second passage 32 may be provided at a distance from each other.

[0019] The outlet of the first flow path 31 may be positioned to face the HVAC intake port 70 of the HVAC unit 7. The outlet of the second flow path 32 may be positioned offset from the HVAC intake port 70. The HVAC unit 7 is a unit that provides heating, ventilation, and air conditioning in the vehicle. The HVAC unit 7 can send the air 10 taken in from the HVAC intake port 70 into the passenger compartment. The air 10 flowing through the first flow path 31 is intended to be supplied to the passenger compartment through the HVAC unit 7, and the air 10 flowing through the second flow path 32 is intended to be discharged outside the vehicle without passing through the HVAC unit 7.

[0020] Valve 4 is configured to switch the flow of air 10 circulating through duct 3 between a first flow path 31 and a second flow path 32. Valve 4 can cause air 10 to flow through the first flow path 31 when moisture from the air 10 is adsorbed onto the humidity control device 2, and to flow air 10 through the second flow path 32 when moisture is released from the humidity control device 2. Figure 1 shows the state in which air 10 is flowing through the first flow path 31. There are no particular restrictions on valve 4 as long as it is electrically driven and has the function of switching flow paths, but examples include solenoid valves and motorized valves. In one embodiment, valve 4 includes an opening / closing door 41 supported on a rotating shaft 40 and an actuator 42 such as a motor that rotates the rotating shaft 40.

[0021] The blower 5 is configured to supply air 10 to the humidity control device 2. The blower 5 may be located inside the duct 3. The blower 5 may be positioned upstream of the humidity control device 2 in the direction of airflow of the air 10.

[0022] The control unit 6 is composed of an ECU (Electronic Control Unit) or the like, and is configured to control the humidity control device 2, the valve 4, and the blower 5. The control unit 6 may be electrically connected to the humidity control device 2, the valve 4, and the blower 5 by wire or wireless means. The control modes of the control unit 6 may include an adsorption mode in which the blower 5 is started without starting the heating means 21 and air 10 is introduced into the first flow path 31, and a regeneration mode in which the blower 5 and the heating means 21 are started and air 10 is introduced into the second flow path 32.

[0023] The control unit 6 performs the regeneration mode when the following conditions (1) and (2) are met. (1) The vehicle is connected to an external power source. (2) Radio waves are received from an electronic key held by the vehicle user, or there is an occupant inside the vehicle.

[0024] By performing the regeneration mode when an external power source is connected to the vehicle, the adsorbent material of the humidity control device 2 can be regenerated using the power from the external source. When the regeneration mode is performed, heating of the adsorption section 20 by the heating means 21, control of the valve 4, and blowing of air by the blower 5 are all performed using the power from the external source. Power from the drive battery is not required to regenerate the adsorbent material.

[0025] Although not limited to these, the control unit 6 can detect whether an external power source is connected to the vehicle based on the output signal of a voltage sensor that measures the voltage of the drive battery or a circuit connected to the drive battery. The voltage sensor may be incorporated into a battery management system that manages the drive battery. When the control unit 6 detects that an external power source is connected, it inputs a regeneration command to the humidity control device 2, and in accordance with the regeneration command, the adsorption unit 20 is heated by the heating means 21.

[0026] If the adsorbent material of the humidity control device 2 is regenerated independently of the occupants, the adsorbent material may absorb a large amount of moisture due to the time elapsed between regeneration and boarding, potentially requiring further regeneration upon boarding. In contrast, when radio waves are received from the electronic key held by the vehicle user, it is likely that an occupant is nearby and will board the vehicle at some point. As in the vehicle air conditioning system 1 of this embodiment, by implementing the regeneration mode when radio waves are received from the electronic key or when an occupant is inside the vehicle, the adsorbent material of the humidity control device 2 can be regenerated more efficiently.

[0027] The electronic key is equipped with a transmitter that emits radio waves at a specific frequency. The vehicle is equipped with a receiver that inputs a detection signal to the control unit 6 when it receives radio waves from the electronic key. The electronic key and the vehicle are equipped with antennas for transmitting and receiving radio waves. The control unit 6 can detect when radio waves from the electronic key are received based on the signal from the receiver. Authentication information (ID) is assigned to the vehicle and the electronic key, and when the electronic key is authenticated by the transmission and reception of authentication information between the vehicle and the electronic key, the doors can be unlocked and the engine or motor can be started. The vehicle emits a polling signal, and when the electronic key receives a polling signal from the vehicle, it transmits authentication information to the vehicle via radio waves. The control unit 6 may perform a regeneration mode when an external power supply is connected to the vehicle and the authentication information from the electronic key matches the authentication information pre-registered in the vehicle. The electronic key may also be called a smart key or portable device, or by other names.

[0028] The control unit 6 can detect the presence of an occupant in the vehicle based on signals from the occupant detection sensor. An example of an occupant detection sensor is a weight sensor installed in the seat, which is configured to detect the occupant's weight when the occupant sits in the seat.

[0029] The control unit 6 does not perform the regeneration mode when the vehicle's power mode is OFF and the above conditions (1) and / or (2) are not met.

[0030] The control unit 6 may determine whether (1) and (2) are satisfied when the vehicle's power mode is OFF. Additionally or alternatively, the control unit 6 may determine whether (1) and (2) are satisfied when the vehicle's power mode is ACC (accessory). Additionally or alternatively, the control unit 6 may determine whether (1) and (2) are satisfied when the vehicle's power mode is ON.

[0031] The power mode can be switched by operating the vehicle's start button or key cylinder. When the power mode is OFF, pressing the start button without pressing the brake pedal switches the power mode to ACC, and pressing the start button while pressing the brake pedal switches the power mode to ON. The power mode can also be switched between OFF, ACC, and ON depending on the position of the key inserted into the key cylinder. When the power mode is OFF, power is stopped to accessory equipment such as the car navigation system and drive equipment such as the motor. However, even when the power mode is OFF, power is supplied to the control unit 6, and the control unit 6 is operational. When the power mode is ACC, power is stopped to the drive equipment, but power is supplied to accessory equipment. When the power mode is ON, power is supplied to both accessory equipment and drive equipment. A sensor detects changes in voltage and / or current corresponding to the power mode, and the control unit 6 can detect the vehicle's power mode based on the signal from the sensor.

[0032] The control unit 6 performs the regeneration mode when (1) and (2) are satisfied but (3) below is not satisfied, and alternates between the regeneration mode and the adsorption mode when (1) and (2) in addition to (3) below are satisfied. (3) The humidity inside the vehicle is above a predetermined threshold.

[0033] When the humidity inside the vehicle is above a predetermined threshold, the adsorption mode is performed in addition to the regeneration mode, thereby reducing the humidity inside the vehicle. The control unit 6 can determine whether or not the humidity inside the vehicle is above a predetermined threshold based on a signal from a humidity sensor configured to detect the humidity inside the vehicle. The humidity sensor may be installed inside the vehicle. A threshold of 40% for the humidity inside the vehicle in (3) is given.

[0034] The period during which the regeneration mode is performed is called the first period, and the period during which the adsorption mode is performed is called the second period. The first period may be the same as the second period, but it may also be longer or shorter than the second period. The first and second periods may be consecutive in time, or there may be a pause between the first and second periods. If the humidity inside the vehicle falls below a predetermined threshold while the regeneration mode and adsorption mode are being performed alternately, the adsorption mode may be omitted and only the regeneration mode may be performed.

[0035] The first period is preferably run for 0.1 to 10 minutes, more preferably for 0.5 to 8 minutes, and even more preferably for 1 to 5 minutes. Alternatively, the relationship between the duration of the first period and the regeneration rate of the adsorption unit 20 may be determined in advance, and the duration of the first period may be set based on that relationship. Furthermore, humidity sensors (not shown) may be installed upstream and downstream of the humidity control device 2, and the first period may be completed when the difference between the upstream and downstream humidity sensors approaches zero (below a predetermined threshold).

[0036] The second period is preferably run for 0.1 to 10 minutes, more preferably for 0.5 to 8 minutes, and even more preferably for 1 to 5 minutes. Humidity sensors (not shown) are installed upstream and downstream of the humidity control device 2, and the second period may be completed when the difference between the upstream and downstream humidity sensors approaches zero (below a predetermined threshold).

[0037] (2. Regarding humidity control devices) Next, Figure 2 is a front view showing the humidity control device 2 in Figure 1, Figure 3 is a right side view showing the humidity control device 2 in Figure 2, and Figure 4 is an enlarged view showing region IV in Figure 2.

[0038] As shown in Figures 2 to 4, the adsorption section 20 of the humidity control device 2 in this embodiment has a honeycomb structure 90 and an adsorption layer 91. The honeycomb structure 90 has an outer wall 900 and a partition wall 901 disposed inside the outer wall 900, which partitions cells 901a that form airflow channels for air 10 extending from a first end face 90a to a second end face 90b. The adsorption layer 91 is a layer containing the adsorbent material described above and is provided on the surface of the partition wall 901 as shown in Figure 4. As air 10 passes through the cells 901a between the first end face 90a and the second end face 90b, moisture from the air 10 is adsorbed by the adsorbent material of the adsorption layer 91.

[0039] In such a humidity control device 2, the heating means 21 has a pair of electrodes 92 and 93 connected to the honeycomb structure 90, and heats the honeycomb structure 90 by passing an electric current through the pair of electrodes 92 and 93 to the honeycomb structure 90. Hereinafter, when referring to the pair of electrodes 92 and 93 separately, one will be called the first electrode 92 and the other the second electrode 93.

[0040] As is particularly evident in Figure 3, the first electrode 92 is provided on the first end face 90a of the honeycomb structure 90, and the second electrode 93 is provided on the second end face 90b of the honeycomb structure 90. The first electrode 92 and the second electrode 93 are provided on the end face of the outer wall 900, and also on the end face of the partition wall 901, as shown in Figure 4. The first electrode 92 and the second electrode 93 do not block the cell 901a. However, a portion of the cell 901a may be blocked by the first electrode 92 and / or the second electrode 93.

[0041] As shown in Figures 2 and 3, a first metal terminal 94 may be provided on the first electrode 92, and a second metal terminal 95 may be provided on the second electrode 93. The first metal terminal 94 and the second metal terminal 95 are rectangular frames attached to the outer periphery of the first end face 90a and the second end face 90b. The first metal terminal 94 and the second metal terminal 95 are provided with extensions that extend outward in the width direction of the honeycomb structure 90 from the rectangular frames.

[0042] The positive electrode of a power supply (not shown) is connected to the extension of either the first metal terminal 94 or the second metal terminal 95, and the negative electrode of the power supply is connected to the other extension of the first metal terminal 94 or the second metal terminal 95. If the positive electrode is connected to the extension of the first metal terminal 94 and the negative electrode is connected to the extension of the second metal terminal 95, the current from the first metal terminal 94 spreads through the first electrode 92 onto the first end face 90a, flows through the honeycomb structure 90 in the direction in which the cell 901a extends, and flows into the second metal terminal 95 through the second electrode 93 on the second end face 90b. This current flow causes the honeycomb structure 90 to heat up uniformly.

[0043] The honeycomb structure 90 may have at least the partition walls 901 made of a material having PTC (Positive Temperature Coefficient) properties. A material having PTC properties has the characteristic that when the temperature rises and exceeds the Curie point, its resistance increases rapidly and it becomes difficult for electricity to flow.

[0044] The following describes in detail each component of the humidity control device 2.

[0045] (2-1. About honeycomb structures) The shape of the honeycomb structure 90 is not particularly limited. For example, the outer shape of the cross-section of the honeycomb structure 90 perpendicular to the flow direction (the direction in which the cells 901a extend) can be a polygon such as a quadrilateral (rectangle, square), pentagon, hexagon, heptagon, or octagon, or a circle, oval (egg, ellipse, oblong, rounded rectangle, etc.). The end faces (first end face 90a and second end face 90b) have the same shape as the cross-section. Furthermore, if the cross-section and end faces are polygonal, the corners may be chamfered.

[0046] The shape of the cell 901a is not particularly limited, but in a cross-section perpendicular to the flow direction of the honeycomb structure 90, it can be a polygon such as a square, pentagon, hexagon, heptagon, or octagon, or a circle or oval shape. These shapes may be single or a combination of two or more. Among these shapes, square or hexagonal is preferred. By providing cells 901a of such shape, the pressure loss when air 10 flows can be reduced. Figures 2 to 4 show an example of a honeycomb structure 90 in which the outer shape of the cross-section and the shape of the cell 901a are square in a cross-section perpendicular to the flow direction of the honeycomb structure 90.

[0047] The honeycomb structure 90 may be a honeycomb joint having a plurality of honeycomb segments and a joining layer that joins the outer periphery sides of the plurality of honeycomb segments. By using a honeycomb joint, it is possible to increase the total cross-sectional area of ​​cells 901a, which are important for securing the airflow rate of the air 10, while suppressing the occurrence of cracks. The bonding layer can be formed using a bonding material. The bonding material is not particularly limited, but a paste made by adding water or other solvent to a ceramic material can be used. The bonding material may contain a material having PTC properties, or it may contain the same material as the outer wall 900 and the partition wall 901. In addition to its role in bonding the honeycomb segments together, the bonding material can also be used as an outer perimeter coating material after the honeycomb segments have been bonded.

[0048] From the viewpoint of ensuring the strength of the honeycomb structure 90, reducing pressure loss when air 10 passes through the cells 901a, ensuring the amount of functional material carried, and ensuring the contact area with the air 10 flowing inside the cells 901a, it is desirable to suitably combine the thickness of the partition wall 901, the cell density, and the cell pitch (or the opening ratio of the cells 901a). In this specification, cell density is a value obtained by dividing the number of cells by the area of ​​one end face (first end face 90a or second end face 90b) of the honeycomb structure 90 (the total area of ​​the partition wall 901 and cells 901a excluding the outer wall 900). In this specification, cell pitch refers to a value obtained by the following calculation. First, the area per cell is calculated by dividing the area of ​​one end face of the honeycomb structure 90 (first end face 90a or second end face 90b) (the total area of ​​the partition wall 901 and cell 901a excluding the outer wall 900) by the number of cells. Next, the square root of the area per cell is calculated and this is defined as the cell pitch. In this specification, the aperture ratio of cell 901a is the value obtained by dividing the total area of ​​cells 901a partitioned by partition walls 901 in a cross section perpendicular to the flow direction of the honeycomb structure 90 by the area of ​​one end face (first end face 90a or second end face 90b) (the total area of ​​partition walls 901 and cells 901a excluding the outer wall 900). Note that the first electrode 92 and the second electrode 93 and the adsorption layer 91 described later are not considered when calculating the aperture ratio of cell 901a.

[0049] In an embodiment advantageous in terms of supporting a sufficient amount of functional material, the thickness of the partition wall 901 is 0.300 mm or less, and the cell density is 140 cells / cm³. 2 The following conditions apply, and the cell pitch is 0.85 mm or more. In a preferred embodiment, the thickness of the partition wall 901 is 0.200 mm or less, and the cell density is 120 cells / cm². 2 The following conditions apply, and the cell pitch is 0.91 mm or more. In a more preferred embodiment, the thickness of the partition wall 901 is 0.160 mm or less, and the cell density is 110 cells / cm². 2 The following conditions apply, and the cell pitch is 0.95 mm or more.

[0050] In each of the above embodiments, from the viewpoint of ensuring the strength of the honeycomb structure 90 and keeping electrical resistance low, the lower limit of the thickness of the partition wall 901 is preferably 0.010 mm or more, more preferably 0.020 mm or more, and even more preferably 0.030 mm or more. In each of the above embodiments, from the viewpoint of ensuring the strength of the honeycomb structure 90, keeping electrical resistance low, and increasing the surface area to promote reaction, adsorption, and desorption, the lower limit of the cell density is 30 cells / cm². 2 Preferably, it is 35 cells / cm 2More preferably, it is as described above, 40 cells / cm 2 Even more preferably, it is as described above. In each of the above embodiments, from the viewpoints of ensuring the strength of the honeycomb structure 90, keeping the electrical resistance low, and increasing the surface area to promote reaction, adsorption, and desorption, the upper limit of the cell pitch is preferably 2.0 mm or less, more preferably 1.8 mm or less, and even more preferably 1.6 mm or less.

[0051] In an advantageous embodiment that is advantageous from the viewpoint of achieving both reduction of pressure loss and maintenance of strength, the thickness of the partition wall 901 is 0.08 to 0.36 mm, the cell density is 2.54 to 140 cells / cm 2 , and the aperture ratio of the cell 901a is 0.70 or more. In a preferred embodiment, the thickness of the partition wall 901 is 0.09 to 0.35 mm, the cell density is 15 to 100 cells / cm 2 , and the aperture ratio of the cell 901a is 0.80 or more. In a more preferred embodiment, the thickness of the partition wall 901 is 0.14 to 0.30 mm, the cell density is 20 to 90 cells / cm 2 , and the aperture ratio of the cell 901a is 0.85 or more.

[0052] In each of the above embodiments, from the viewpoint of ensuring the strength of the honeycomb structure 90, the upper limit of the aperture ratio of the cell 901a is preferably 0.94 or less, more preferably 0.92 or less, and even more preferably 0.90 or less.

[0053] The thickness of the outer wall 900 is not particularly limited, but it is preferably determined based on the following viewpoints. First, from the viewpoint of reinforcing the honeycomb structure 90, the thickness of the outer wall 900 is preferably 0.05 mm or more, more preferably 0.06 mm or more, and even more preferably 0.08 mm or more. On the other hand, from the viewpoints of increasing the electrical resistance to suppress the initial current and reducing the pressure loss when the air 10 flows, the thickness of the outer wall 900 is preferably 1.0 mm or less, more preferably 0.5 mm or less, even more preferably 0.4 mm or less, and even more preferably 0.3 mm or less. In this specification, the thickness of the outer wall 900 refers to the length in the direction normal to the side surface, from the boundary between the outer wall 900 and the outermost cell 901a or partition wall 901 to the side surface of the honeycomb structure 90, in a cross section perpendicular to the flow direction of the honeycomb structure 90.

[0054] The length of the honeycomb structure 90 in the flow direction and the cross-sectional area perpendicular to the flow direction can be adjusted to the required size of the humidity control device 2 and are not particularly limited. For example, when used in a compact humidity control device 2 while ensuring a predetermined function, the honeycomb structure 90 may have a length of 2 to 20 mm in the flow direction and a cross-sectional area perpendicular to the flow direction of 10 cm². 2 The above can be applied. The upper limit of the cross-sectional area of ​​the honeycomb structure 90 perpendicular to the flow direction is not particularly limited, but for example, 300 cm². 2 That is the case.

[0055] The partition walls 901 constituting the honeycomb structure 90 are made of a material capable of generating heat when an electric current is passed through them, specifically a material having PTC properties. If necessary, the outer wall 900 may also be made of a material having PTC properties similar to the partition walls 901. With this configuration, it is possible to heat the adsorption layer 91 by heat transfer from the heat-generating partition walls 901 (and the outer wall 900 if necessary). Furthermore, materials having PTC properties have the characteristic that when the temperature rises and exceeds the Curie point, the resistance value increases rapidly and it becomes difficult for electricity to flow. Therefore, when the humidity control device 2 becomes hot, the current flowing through the partition walls 901 (and the outer wall 900 if necessary) is limited, thus suppressing excessive heat generation in the humidity control device 2. Consequently, it is also possible to suppress thermal degradation of the adsorption layer 91 caused by excessive heat generation.

[0056] From the viewpoint of obtaining appropriate heat generation, the lower limit of the volume resistivity of a PTC-type material at 25°C is preferably 0.5 Ω·cm or more, more preferably 1 Ω·cm or more, and even more preferably 5 Ω·cm or more. From the viewpoint of generating heat with a low drive voltage, the upper limit of the volume resistivity of a PTC-type material at 25°C is preferably 170 Ω·cm or less, more preferably 160 Ω·cm or less, and even more preferably 150 Ω·cm or less. In this specification, the volume resistivity of a PTC-type material at 25°C is measured in accordance with JIS K6271:2008.

[0057] From the viewpoint of being electrically conductive and having PTC characteristics, it is preferable that the outer wall 900 and the partition wall 901 are made of a material mainly composed of barium titanate (BaTiO3). Furthermore, it is more preferable that this material is a ceramic material mainly composed of barium titanate (BaTiO3)-based crystalline particles in which a portion of Ba is replaced with rare earth elements. In this specification, "main component" means a component whose proportion to the total component exceeds 50% by mass. The content of BaTiO3-based crystalline particles can be determined by fluorescent X-ray analysis. Other crystalline particles can also be measured in the same manner.

[0058] The compositional formula for BaTiO3-based crystal grains in which some of the Ba is replaced by rare earth elements is (Ba 1-x A x It can be represented as TiO3. In the empirical formula, A represents one or more rare earth elements, and 0.0001 ≤ x ≤ 0.010. A is not particularly limited as long as it is a rare earth element, but is preferably one or more selected from the group consisting of La, Ce, Pr, Nd, Eu, Gd, Dy, Ho, Er, Y, and Yb, and is more preferably La. x is preferably 0.001 or more, more preferably 0.0015 or more, from the viewpoint of suppressing excessively high electrical resistance at room temperature. On the other hand, x is preferably 0.009 or less, from the viewpoint of suppressing excessively high electrical resistance at room temperature due to insufficient sintering. The content of BaTiO3-based crystalline particles in ceramics, in which a portion of Ba is substituted with rare earth elements, is not particularly limited as long as it constitutes the main component, but is preferably 90% by mass or more, more preferably 92% by mass or more, and even more preferably 94% by mass or more. The upper limit of the content of BaTiO3-based crystalline particles is not particularly limited, but is generally 99% by mass, preferably 98% by mass. The content of these BaTiO3-based crystalline particles can be measured by X-ray fluorescence analysis. Other crystalline particles can be measured in the same manner.

[0059] From the viewpoint of reducing environmental impact, it is desirable that the materials used for the outer wall 900 and the partition wall 901 are substantially free of lead (Pb). Specifically, the Pb content of the outer wall 900 and the partition wall 901 is preferably 0.01% by mass or less, more preferably 0.001% by mass or less, and even more preferably 0% by mass. The low Pb content allows, for example, the heated air 10, which is brought into contact with the heat-generating partition wall 901, to be safely directed at living organisms such as humans. In addition, the Pb content of the outer wall 900 and the partition wall 901, when converted to PbO, is preferably less than 0.03% by mass, more preferably less than 0.01% by mass, and even more preferably 0% by mass. The lead content can be determined by ICP-MS (inductively coupled plasma mass spectrometry).

[0060] The lower limit of the Curie point of the materials constituting the outer wall 900 and the partition wall 901 is preferably 80°C or higher, more preferably 90°C or higher, and even more preferably 100°C or higher, from the viewpoint of efficiently heating the air 10. The upper limit of the Curie point is preferably 250°C or lower, more preferably 225°C or lower, even more preferably 200°C or lower, and even more preferably 150°C or lower, from the viewpoint of safety as a component placed in or near the vehicle compartment.

[0061] The Curie points of the materials constituting the outer wall 900 and the partition wall 901 can be adjusted by the type and amount of sifter added. For example, the Curie point of barium titanate (BaTiO3) is approximately 120°C, but by substituting some of the Ba and Ti with one or more of Sr, Sn, and Zr, the Curie point can be shifted to a lower temperature.

[0062] In this specification, the Curie point is measured by the following method: The sample is mounted in a sample holder for measurement and placed in a measuring chamber (e.g., MINI-SUBZERO MC-810P, manufactured by ESPEC Corporation). The change in the electrical resistance of the sample with respect to temperature changes as the temperature is raised from 10°C is measured using a DC resistance meter (e.g., Multimeter 3478A, manufactured by YOKOGAWA HEWLETT PACKARD, LTD). The Curie point is defined as the temperature at which the resistance value becomes twice the resistance value at room temperature (20°C) as shown in the electrical resistance-temperature plot obtained from the measurement.

[0063] (2-2. Regarding the first and second electrodes) The first electrode 92 and the second electrode 93 are provided on the first end face 90a and the second end face 90b. By applying a voltage between the first electrode 92 and the second electrode 93, it is possible to generate heat in the honeycomb structure 90 by Joule heating.

[0064] The first electrode 92 and the second electrode 93 are not particularly limited, but for example, metals or alloys containing at least one selected from Cu, Ag, Al, Ni, and Si can be used. Alternatively, ohmic electrodes capable of ohmic contact with the outer wall 900 and / or partition wall 901 having PTC properties can be used. For example, an ohmic electrode can be used that contains at least one selected from Al, Au, Ag, and In as a base metal and at least one selected from Ni, Si, Zn, Ge, Sn, Se, and Te for n-type semiconductors as a dopant. The first electrode 92 and the second electrode 93 may be a single-layer structure or a multilayer structure of two or more layers. If the first electrode 92 and the second electrode 93 have a multilayer structure of two or more layers, the materials of each layer may be the same type or different types.

[0065] The thicknesses of the first electrode 92 and the second electrode 93 can be appropriately set depending on the method of forming the first electrode 92 and the second electrode 93. Methods for forming the first electrode 92 and the second electrode 93 include metal deposition methods such as sputtering, vapor deposition, electrolytic deposition, and chemical deposition. The first electrode 92 and the second electrode 93 can also be formed by applying electrode paste and then baking it, or by thermal spraying. Furthermore, the first electrode 92 and the second electrode 93 may be formed by joining metal plates or alloy plates.

[0066] The thickness of the first electrode 92 and the second electrode 93 is preferably about 5 to 30 μm for electrode paste baking, about 100 to 1000 nm for dry plating such as sputtering and vapor deposition, about 10 to 100 μm for thermal spraying, and about 5 to 30 μm for wet plating such as electroplating and chemical deposition. Furthermore, when joining metal plates or alloy plates, their thickness is preferably about 5 to 100 μm.

[0067] (2-3. Regarding the first and second metal terminals) By providing the first metal terminal 94 and the second metal terminal 95, connection to an external power supply is facilitated. The first metal terminal 94 and the second metal terminal 95 are connected to a conductor connected to the external power supply.

[0068] The metals constituting the first metal terminal 94 and the second metal terminal 95 can be single metals or alloys, but from the viewpoint of corrosion resistance, electrical resistivity and coefficient of linear expansion, it is preferable to use an alloy containing at least one selected from the group consisting of Cr, Fe, Co, Ni, Cu, Al, and Ti, and stainless steel, Fe-Ni alloy, and phosphor bronze are more preferable. The thickness of the first metal terminal 94 and the second metal terminal 95 is not particularly limited, but is, for example, 0.01 to 10 mm, typically 0.05 to 5 mm.

[0069] The method of connecting the first metal terminal 94 and the second metal terminal 95 to the first electrode 92 and the second electrode 93 is not particularly limited as long as they are electrically connected, and can be done by means of diffusion bonding, a mechanical pressurizing mechanism, welding, etc.

[0070] (2-4. Regarding intermediate materials) An intermediate material may be provided between the first electrode 92 and the second electrode 93 and the first metal terminal 94 and the second metal terminal 95. By providing an intermediate material, the structural degree of freedom of the connection between the first electrode 92 and the second electrode 93 and the first metal terminal 94 and the second metal terminal 95 is increased. The material of the intermediate material is not particularly limited and can be the same as the material of the first metal terminal 94 and the second metal terminal 95 described above. Alternatively, the material of the intermediate material may be different from the material of the first metal terminal 94 and the second metal terminal 95 described above. In this case, the intermediate material can be formed from solder, brazing material, conductive adhesive, etc. The method of connecting the intermediate material to the first metal terminal 94 and the second metal terminal 95 and the first electrode 92 and the second electrode 93 is not particularly limited as long as they are electrically connected, and can be connected by, for example, diffusion bonding, a mechanical pressurizing mechanism, welding, etc.

[0071] (2-5. Regarding the adsorption layer) As shown in Figure 4, the humidity control device 2 may include an adsorption layer 91 provided on the surface of the partition wall 901. The adsorption layer 91 can be provided on the surface of the partition wall 901 (in the case of the outermost cell 901a, the partition wall 901 and the outer wall 900 that partition the outermost cell 901a). By providing the adsorption layer 91 in this way, the functional material contained in the adsorption layer 91 becomes easier to heat, thereby enabling the functional material to exhibit the desired function.

[0072] The adsorbent contained in the adsorption layer 91 is not particularly limited as long as it is a material that can exhibit the desired function. The adsorbent has the function of adsorbing moisture, carbon dioxide and / or volatile components from the air. The adsorption layer 91 may also further contain a catalyst. This allows for the purification of the adsorbed substance. By using the adsorbent and catalyst in combination, the adsorption function of the adsorbent in capturing the adsorbed substance can be enhanced.

[0073] The adsorbent preferably has the function of adsorbing target substances, such as moisture, carbon dioxide, and volatile components, at -20 to 40°C and desorbing them at high temperatures of 60°C or higher. Examples of adsorbents having such function include zeolite, silica gel, activated carbon, alumina, silica, low-crystalline clay, and amorphous aluminum silicate composites. The type of adsorbent should be appropriately selected according to the type of target substance. The adsorbent may be used alone or in combination of two or more types.

[0074] The catalyst is preferably one that has the function of promoting oxidation-reduction reactions. Examples of catalysts with such function include metal catalysts such as Pt, Pd, and Ag, and oxide catalysts such as CeO2 and ZrO2. The catalyst may be used alone or in combination of two or more types.

[0075] Volatile components contained in the air inside a vehicle include, for example, volatile organic compounds (VOCs) and odor components other than VOCs. Specific examples of volatile components include ammonia, acetic acid, isovaleric acid, nonenal, formaldehyde, toluene, xylene, paradichlorobenzene, ethylbenzene, styrene, chlorpyrifos, di-n-butyl phthalate, tetradecane, di-2-ethylhexyl phthalate, diazinon, acetaldehyde, and N-methylcarbamate-2-(1-methylpropyl)phenyl.

[0076] The thickness of the adsorption layer 91 can be determined according to the size of the cell 901a and is not particularly limited. For example, from the viewpoint of ensuring sufficient contact with the air 10, the thickness of the adsorption layer 91 is preferably 20 μm or more, more preferably 25 μm or more, and even more preferably 30 μm or more. On the other hand, from the viewpoint of suppressing the peeling of the adsorption layer 91 from the partition wall 901 and the outer wall 900, the thickness of the adsorption layer 91 is preferably 400 μm or less, more preferably 380 μm or less, and even more preferably 350 μm or less.

[0077] The thickness of the adsorption layer 91 is measured by the following procedure. An arbitrary cross section parallel to the flow direction of the honeycomb structure 90 is cut out, and a cross-sectional image at approximately 50x magnification is obtained using a scanning electron microscope or the like. This cross section is also taken so that it passes through the centroid position of a cross section perpendicular to the flow direction of the honeycomb structure 90. For each adsorption layer 91 visible in the cross-sectional image, the thickness is calculated by dividing the cross-sectional area by the length of the cell 901a in the flow direction. This calculation is performed for all adsorption layers 91 visible in the cross-sectional image, and the overall average value is taken as the thickness of the adsorption layer 91.

[0078] From the viewpoint of ensuring that the functional material performs the desired function within the humidity control device 2, the amount of the adsorption layer 91 is preferably 50 to 500 g / L, more preferably 100 to 400 g / L, and even more preferably 150 to 350 g / L, relative to the volume of the honeycomb structure 90. The volume of the honeycomb structure 90 is determined by the external dimensions of the honeycomb structure 90.

[0079] (3. Regarding the manufacturing method of humidity control devices) The method for manufacturing the humidity control device 2 according to the embodiment of the present invention is not particularly limited as long as it has the above-described features, and can be carried out in accordance with known methods. Hereinafter, a method for manufacturing the humidity control device 2 according to the embodiment of the present invention will be described illustratively. The manufacturing method for the honeycomb structure 90 constituting the humidity control device 2 includes a molding step and a firing step. In the molding process, a clay mold containing ceramic raw materials including BaCO3 powder, TiO2 powder, and rare earth nitrate or hydroxide powder is molded to produce a honeycomb molded body with a relative density of 60% or more. Ceramic raw materials can be obtained by dry-mixing each powder to achieve the desired composition. The clay can be obtained by adding a dispersion medium, binder, plasticizer, and dispersant to ceramic raw materials and kneading them together. The clay may also contain additives such as sifters, metal oxides, property improvers, and conductive powders as needed. The amount of components other than ceramic raw materials is not particularly limited, as long as it is such that the relative density of the honeycomb molded body is 60% or more.

[0080] Here, in this specification, "relative density of the honeycomb molded body" means the ratio of the density of the honeycomb molded body to the true density of the entire ceramic raw material. Specifically, it can be calculated by the following formula. Relative density (%) of honeycomb molded material = Density (g / cm³) of honeycomb molded material 3 ) / True density of the entire ceramic raw material (g / cm³) 3 ) × 100 The density of a honeycomb molded body can be measured by the Archimedes method using pure water as the medium. The true density of the entire ceramic material is calculated by adding the mass of each material (g) and then adding the actual volume of each material (cm³). 3 It can be found by dividing by ).

[0081] Examples of dispersion media include water, or a mixed solvent of water and an organic solvent such as alcohol, but water is particularly suitable.

[0082] Examples of binders include organic binders such as methylcellulose, hydroxypropoxylcellulose, hydroxyethylcellulose, carboxymethylcellulose, and polyvinyl alcohol. In particular, the combined use of methylcellulose and hydroxypropoxylcellulose is preferred. A single binder may be used, or two or more may be used in combination, but it is preferable that the binder does not contain alkali metal elements.

[0083] Examples of plasticizers include polyoxyalkylene alkyl ethers, polycarboxylic acid polymers, and alkyl phosphate esters.

[0084] Dispersants that can be used include surfactants such as polyoxyalkylene alkyl ethers, ethylene glycol, dextrin, fatty acid soaps, and polyalcohols. Dispersants may be used individually or in combination of two or more types.

[0085] Honeycomb molded bodies can be manufactured by extruding clay. During extrusion molding, a die with the desired overall shape, cell shape, partition wall thickness, cell density, etc., can be used.

[0086] The relative density of the honeycomb molded body obtained by extrusion molding is 60% or more, preferably 65% ​​or more. By controlling the relative density of the honeycomb molded body within this range, it is possible to densify the honeycomb molded body and reduce its electrical resistance at room temperature. The upper limit of the relative density of the honeycomb molded body is not particularly limited, but is generally 80%, preferably 75%.

[0087] The honeycomb molded body can be dried before the firing process. The drying method is not particularly limited, but conventional known drying methods such as hot air drying, microwave drying, dielectric drying, reduced pressure drying, vacuum drying, and freeze drying can be used. Among these, a drying method combining hot air drying with microwave drying or dielectric drying is preferred because it can dry the entire molded body quickly and uniformly.

[0088] The firing process includes maintaining the temperature at 1150-1250°C, then increasing the temperature to a maximum of 1360-1430°C at a heating rate of 20-600°C / hour, and maintaining the temperature for 0.5-10 hours. By holding the honeycomb molded body at a maximum temperature of 1360-1430°C for 0.5-10 hours, a honeycomb structure 90 can be obtained that mainly consists of BaTiO3-based crystalline grains in which some of the Ba is replaced by rare earth elements. Furthermore, by maintaining the temperature at 1150-1250°C, the Ba2TiO4 crystal particles generated during the firing process are more easily removed, thereby densifying the honeycomb structure 90. Furthermore, by setting the heating rate from 1150-1250°C to the maximum temperature of 1360-1430°C to 20-600°C / hour, 1.0-10.0 mass% of Ba6Ti 17 O 40 Crystal particles can be generated in the honeycomb structure 90.

[0089] The holding time at 1150-1250°C is not particularly limited, but is preferably 0.5-10 hours. This holding time makes it easier to stably remove the Ba2TiO4 crystal grains generated during the firing process.

[0090] The firing process preferably includes holding the temperature at 900-950°C for 0.5-5 hours during the heating phase. Holding the temperature at 900-950°C for 0.5-5 hours allows BaCO3 to decompose efficiently, making it easier to obtain a honeycomb structure 90 having a predetermined composition.

[0091] Furthermore, a degreasing process may be performed before the firing process to remove the binder. The atmosphere during the degreasing process is preferably atmospheric air to completely decompose the organic components. Furthermore, the atmosphere during the firing process is preferably an atmospheric environment, from the viewpoint of controlling electrical properties and reducing manufacturing costs. The furnace used in the firing and degreasing processes is not particularly limited, but electric furnaces, gas furnaces, etc., can be used.

[0092] The humidity control device 2 can be manufactured by forming the first electrode 92 and the second electrode 93 on the honeycomb structure 90 obtained in this manner. The first electrode 92 and the second electrode 93 can also be formed by metal deposition methods such as sputtering, vapor deposition, electrolytic deposition, and chemical deposition. The first electrode 92 and the second electrode 93 can also be formed by applying electrode paste and then baking it. Furthermore, the first electrode 92 and the second electrode 93 can also be formed by thermal spraying. The first electrode 92 and the second electrode 93 may consist of a single layer, but they can also consist of multiple electrode layers with different compositions. Typical methods for forming the first electrode 92 and the second electrode 93 will be described below.

[0093] First, an electrode slurry containing electrode material, an organic binder, and a dispersion medium is prepared and applied to the first end face 90a or the second end face 90b of the honeycomb structure 90. The dispersion medium can be water, an organic solvent (e.g., toluene, xylene, ethanol, n-butanol, ethyl acetate, butyl acetate, terpineol, dihydroterpineol, texanol, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether), or a mixture thereof. Excess slurry around the outer periphery of the honeycomb structure 90 is removed by blowing and wiping. Subsequently, the first electrode 92 and the second electrode 93 can be formed on the first end face 90a or the second end face 90b of the honeycomb structure 90 by drying the slurry. Drying can be performed, for example, by heating the humidity control device 2 to a temperature of about 120 to 600°C. The series of steps—coating, slurry removal, and drying—may be performed only once, but by repeating the process multiple times, the first electrode 92 and second electrode 93 of the desired thickness can be provided.

[0094] Next, the first metal terminal 94 and the second metal terminal 95 are placed at predetermined positions on the first electrode 92 and the second electrode 93, and the first electrode 92 and the second electrode 93 are connected to the first metal terminal 94 and the second metal terminal 95. The above-described method can be used for connecting the first electrode 92 and the second electrode 93 to the terminals. Furthermore, if an intermediate material is provided between the first electrode 92 and the second electrode 93 and the first metal terminal 94 and the second metal terminal 95, the intermediate material can be placed at predetermined positions on the first electrode 92 and the second electrode 93 and connected, and then the first metal terminal 94 and the second metal terminal 95 can be placed at predetermined positions on the intermediate material and connected. The above-described method can be used for these connections. The first metal terminal 94, the second metal terminal 95, and the intermediate material may be installed after the adsorption layer 91 described below has been formed.

[0095] Next, by forming an adsorption layer 91 on the surface of the partition wall 901 or the like of the humidity control device 2 obtained in this way, a humidity control device with a functional material-containing layer is obtained. The method for forming the adsorption layer 91 is not particularly limited, but for example, it can be formed by the following steps: The humidity control device 2 is immersed in a slurry containing a functional material, an organic binder, and a dispersion medium for a predetermined time, and excess slurry from the end faces and outer circumference of the honeycomb structure 90 is removed by blowing and wiping. The dispersion medium can be water, an organic solvent (e.g., toluene, xylene, ethanol, n-butanol, ethyl acetate, butyl acetate, terpineol, dihydroterpineol, texanol, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether) or a mixture thereof. After that, the adsorption layer 91 can be formed on the surface of the partition wall 901 by drying the slurry. Drying can be carried out, for example, by heating the humidity control device 2 to a temperature of about 120 to 600°C. The series of steps—immersion, slurry removal, and drying—may be performed only once, but by repeating them multiple times, an adsorption layer 91 of the desired thickness can be formed on the surface of the partition wall 901 or the like.

[0096] Although preferred embodiments of the present invention have been described in detail above with reference to the attached drawings, the present invention is not limited to these examples. It is clear to any person with ordinary skill in the art to which the present invention belongs that various modifications or alterations can be conceived within the scope of the technical idea described in the claims, and these are also understood to fall within the technical scope of the present invention. [Explanation of Symbols]

[0097] 1: Vehicle air conditioning system 2: Humidity control devices 3: Duct 4: Valve 5: Blower 6: Control Unit 10: Air 20: Adsorption part 21: Heating means 31: First channel 32: Second channel 90: Honeycomb structure 90a: 1st end surface 90b: Second end surface 91: Adsorption layer 92: Electrode 93: Electrode 900: Exterior wall 901: Bulkhead

Claims

1. A humidity control device comprising an adsorption section containing an adsorbent that adsorbs moisture at a predetermined temperature or below and allows the adsorbed moisture to be released when the predetermined temperature is exceeded, and a heating means capable of heating the adsorption section, A duct through which air from the vehicle's cabin or outside the vehicle can flow, wherein the humidity control device is disposed inside the duct, and the duct has a first flow path downstream of the humidity control device for introducing the air into the cabin and a second flow path for discharging the air outside the vehicle. A valve capable of switching the airflow between the first flow path and the second flow path, A blower that supplies the air to the humidity control device, The control unit controls the humidity control device, the valve, and the blower. Equipped with, The control modes of the control unit include an adsorption mode in which the blower is activated without activating the heating means and the air is introduced into the first flow path, and a regeneration mode in which the blower and the heating means are activated and the air is introduced into the second flow path. The control unit shall perform the playback mode when the following conditions (1) and (2) are met: (1) The vehicle is connected to an external power source. (2) When radio waves are received from an electronic key held by the user of the vehicle, or when there is an occupant inside the vehicle, Vehicle air conditioning system.

2. The control unit determines whether conditions (1) and (2) are met when the vehicle's power mode is OFF. The vehicle air conditioning system according to claim 1.

3. The control unit determines whether conditions (1) and (2) are met when the vehicle's power mode is ACC or ON. The vehicle air conditioning system according to claim 1.

4. The control unit performs the regeneration mode when (1) and (2) are satisfied but (3) below is not satisfied, and alternately performs the regeneration mode and the adsorption mode when (1) and (2) in addition to (3) below are satisfied. (3) The humidity inside the vehicle is above a predetermined threshold, The vehicle air conditioning system according to claim 1.

5. The adsorption portion comprises an outer wall and a honeycomb structure disposed inside the outer wall, having partition walls that partition cells forming the airflow channels extending from a first end face to a second end face, and an adsorption layer containing the adsorbent material provided on the surface of the partition walls. The heating means includes a pair of electrodes connected to the honeycomb structure, and heats the honeycomb structure by passing an electric current through the pair of electrodes. The honeycomb structure is composed of a material in which at least the partition wall has PTC properties. A vehicle air conditioning system according to any one of claims 1 to 4.

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