JP2007062562A - Dehumidifier for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress breeding of mold or unwanted bacteria by efficiently dehumidifying atmosphere around an evaporator. <P>SOLUTION: The dehumidifier 6 is provided with a negative electrode 4a and a positive electrode 4b on both surfaces of a proton conduction type electrolyte film 1. The dehumidifier is disposed in an attaching duct 9a communicating an evaporator case 9 and an engine compartment 11 so as to open to the engine compartment on the negative electrode side and open to the evaporator case on the positive electrode side. After the operation of the evaporator stops, a valve provided at an opening portion of the evaporator case is closed. Direct current voltage is applied to each electrode of the dehumidifier to electrolyze water in the evaporator case on the positive electrode side, and the water is discharged from the negative electrode to the engine compartment. In that case, the temperature of the negative electrode side is raised due to exhaust heat from the engine compartment, so that heat energy required for the electrolysis of the water in the dehumidifier is compensated, and activation of catalyst reaction in the electrode is promoted. Consequently, dehumidification can be efficiently carried out by little energy. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle dehumidifier for dehumidifying a vehicle interior.

  Conventionally, the atmosphere around the evaporator inside the air conditioner has become a high humidity, causing mold and bacteria to propagate and causing bad odors from being generated inside the air conditioner. To solve this problem, for example, the surface of the evaporator is coated with an antibacterial or bactericidal agent (for example, see Patent Document 1), the evaporator surface is cleaned with a photocatalyst, or the evaporator surface is directly irradiated with ultraviolet rays to sterilize. There exists a thing (for example, refer patent document 2).

On the other hand, there is one that removes moisture in an enclosed space by electrolysis with a moisture remover using a proton conductive solid electrolyte (see, for example, Patent Document 3).
Japanese Patent Laid-Open No. 10-185357 Japanese Patent Laid-Open No. 10-141838 Japanese Patent No. 2915019

  However, since the surface of the evaporator is complicated in shape and has a large surface area, in the prior art described in Patent Documents 1 and 2, the medicine is uniformly applied to the evaporator surface, or the evaporator surface is irradiated with light uniformly. This is difficult, and there is a problem that the life span of the drug effect is short, and the effect of preventing the growth of mold and various germs of the evaporator is limited.

  Further, when the prior art described in Patent Document 3 is used for dehumidifying the atmosphere around the evaporator, normally, the wind blown into the vehicle interior constantly flows around the evaporator, so that an efficient dehumidifying effect is obtained. There is a problem that cannot be obtained.

  In view of the above points, an object of the present invention is to efficiently dehumidify the atmosphere around an evaporator and suppress the growth of mold and bacteria.

  In order to achieve the above-described object, the present invention provides an proton-conducting electrolyte membrane (1) having an anode (4b) and a cathode (4a) formed on both sides, and an evaporator case (9) that houses an evaporator (8) of an air conditioner. ) And a power duct (9a) that communicates the power source of the vehicle, and the anode side is opened inside the evaporator case and the cathode side is opened to the power room. It is characterized by.

  Usually, during the operation of the cooler as the air conditioner, the temperature of the evaporator is lowered to near freezing point, so the temperature on the anode side opened in the evaporator case is also lowered, thereby reducing the electrolysis efficiency of the dehumidifier.

  On the other hand, in the present invention, the exhaust heat generated in the power chamber can increase the temperature on the cathode side opened to the power chamber through the attachment duct, and further the temperature on the anode side can be increased. Therefore, the dehumidifying efficiency of the dehumidifier can be improved.

  Further, at least one surface of the proton conductive electrolyte membrane on which the anode and the cathode are formed is covered with a heat insulating material (5a, 5b) on a surface portion not covered with the anode electrode or the cathode electrode. And

  As a result, on the cathode side, due to the exhaust heat from the power chamber open to the cathode, the temperature of the part not covered with the electrode rises excessively, and the moisture contained in the proton conducting electrolyte membrane evaporates. It can be prevented by a heat insulating material.

  In addition, on the anode side, a heat insulating material prevents the temperature of the portion not covered by the electrode from being lowered by the evaporator from the inside of the evaporator case that is open to the anode, thereby reducing the operating efficiency of the dehumidifier 6. can do.

  Further, the evaporator case that is the object of dehumidification is usually provided with an inlet and an outlet for air passing through the evaporator as the conditioned air, and a valve that can be opened and closed is provided at all the openings of the inlet and outlet. If these valves are fully closed during operation, the inside of the evaporator case can be made into a sealed space, and the air in the evaporator case can be used for a short time and with a small amount of power by making the best use of the dehumidifying capacity of the dehumidifier. Can be dried.

  If the humidity in the evaporator case is detected, the driving power of the dehumidifier can be intermittently set according to the detected humidity in the case, and power saving can be achieved.

  In addition, after the operation of at least one of the power source of the vehicle and the evaporator is stopped and the cooler operation is stopped, the air blower (25) of the air conditioner is set in a blowing state to send wind to the evaporator. The blowing state is continued for the duration of the blowing, and after the duration of the blowing, the blower is stopped and simultaneously the operation of the dehumidifier is started.

  Thereby, the evaporator temperature lowered immediately after the end of the cooler operation is quickly raised by air blowing, and the dehumidifier operation is started when the temperature in the evaporator case becomes relatively high after the air blowing continuation period, The operating efficiency of the dehumidifier can be increased.

  The ventilation duration may be set in advance, or the time when the temperature inside the evaporator case rises and becomes equal to or close to the outside air temperature is defined as the end time of the ventilation duration. The operation may be started.

  Further, if the operation of the dehumidifier is stopped when the voltage of the battery that supplies the driving power for the dehumidifier decreases and an alarm is issued, battery protection can be reliably performed.

  In addition, the code | symbol in the bracket | parenthesis of each means described in a claim and this column shows the correspondence with the specific means as described in embodiment mentioned later.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a basic structure of a dehumidifier 6 according to the present embodiment, where (a) is a perspective view and (b) is a cross-sectional view.

  The dehumidifier 6 has a structure in which the catalyst layers 2a and 2b and the diffusion layers 3a and 3b are sandwiched in this order from both sides of the proton conducting electrolyte membrane 1 and bonded or thermocompression bonded.

  The electrode 4a is formed by the catalyst layer 2a and the diffusion layer 3a on one surface, and the electrode 4b is formed by the catalyst layer 2b and the diffusion layer 3b on the other surface. The surface portions of the proton conducting electrolyte membrane 1 where the electrodes 4a and 4b are not formed are covered with heat insulating materials 5a and 5b.

  In these electrodes 4a and 4b, a voltage and current capable of electrolyzing water are supplied between the anode 4b which is an electrode connected to the positive electrode of the DC power source 7 and the cathode 4a which is an electrode connected to the negative electrode. . Note that the theoretical voltage at which water can be electrolyzed is 1.23 V, and the current at that time is determined by the dehumidifying speed and the like.

As a result, water in the air on the anode 4b side is electrolyzed, and water is discharged to the cathode 4a side together with water molecules accompanying the proton H ⁺ generated by this electrolysis. This will be explained in a little more detail.

The electrolysis of water is an endothermic reaction as represented by the following formula.
H ₂ O (gas) = H ₂ (gas) + (1/2) O ₂ (gas) -273.13 (KJ / mol)
That is, when energy of 237.13 (KJ / mol) is added to water, decomposition occurs, and it is known that a voltage of 1.23 V is theoretically required when the energy is supplied by electricity.

  However, in actuality, the amount of heat released from the reaction must be compensated, and electrolysis does not occur unless a voltage greater than 1.23 V or energy greater than 237.13 (KJ / mol) is applied.

  As a method of supplementing the energy of 1.23 V + α, it is conceivable to give the sum of electric energy and heat energy. That is, if a larger amount of heat energy is supplied, the amount of electric energy can be reduced accordingly.

  In the present embodiment, as will be described later, exhaust heat accumulated in the engine compartment in which the engine that is the power source of the automobile is housed (in the case of a fuel cell automobile, the exhaust heat of the fuel cell stack, in the case of an electric automobile, the battery The temperature of the anode 4b and the cathode 4a of the dehumidifier 6 is increased using the exhaust heat of

  Furthermore, since the catalyst activity at the cathode 4a and the anode 4b can be improved by this temperature rise, the electrolysis operating efficiency can be further improved.

  As a result of the electrolysis reaction with improved reactivity, the water present on the anode 4b side is decomposed and the water is released on the cathode 4a side. This can be expressed as follows.

Anode side reaction: H ₂ O → 2H ⁺ + (1/2) O ₂ + 2e ⁻
Cathode side reaction: 2H ⁺ + (1/2) O ₂ + 2e ⁻ → H ₂ O
When 1 mol of water molecules is electrolyzed at this time, 2 mol of H ⁺ is generated, and each H ⁺ is accompanied by N mol of accompanying water from the anode 4b side to the cathode 4a side inside the proton conducting electrolyte membrane 1. I know it will move.

  Further, when the normal proton conductive electrolyte membrane 1 is used, it is experimentally known that this N value is 4 to 5. Therefore, when 1 mol of water molecules is electrolyzed from the anode 4b side, the cathode 4a. It is calculated that ((4-5) × 2 + 1) moles of water molecules are discharged (dehumidified) to the side.

  Next, the vehicle dehumidifier of this embodiment will be described. FIG. 2 is a diagram showing a schematic configuration of the present embodiment, and FIG. 3 is a cross-sectional view of the dehumidifier 6 portion in FIG. FIG. 4 is a diagram showing the configuration of the control system of the present embodiment. In FIG. 2, only the evaporator 8 which is a heat exchanger for cooling and its peripheral devices are shown in the air conditioner.

  The evaporator 8 is housed in an evaporator case 9. The evaporator case 9 is disposed in the passenger compartment 10. One opening of the attachment duct 9a is connected to the evaporator case 9. The other end of the mounting duct 9a is connected to the interior of the engine chamber 11 via a partition wall 12 that separates the engine chamber 11 as a power chamber in which an engine (not shown) that is a power source of the vehicle is housed and the vehicle interior 10. Open to.

  A dehumidifier 6 is fixedly disposed in the attachment duct 9a. In this arrangement, the proton conducting electrolyte membrane 1 blocks the mounting duct 9a, the anode 4b side is opened in the evaporator case 9 so as to be in contact with the air inside, and the cathode 4a side exhausts heat from the engine compartment 11. It is open to the engine compartment 11 so that it can be received.

  By operating the dehumidifier 6 attached in this way, particularly after the engine is stopped (or after the air conditioner is stopped), the exhaust heat in the engine chamber 11 on the cathode 4a side is utilized to make the anode 4b and cathode 4a portions The temperature is increased, thereby promoting the electrolysis reaction of water, which is an endothermic reaction, and the catalytic reaction of the catalyst layers of the electrodes 4a and 4b, so that the moisture in the evaporator case 9 on the anode 4b side is transferred to the engine on the cathode 4a side. It can be discharged into the chamber 11 (outside the vehicle).

  The evaporator case 9 is connected to a duct 15 that guides air outside the passenger compartment (outside air) introduced from the outside air inlet 14 into the evaporator case 9. A valve 16 capable of opening and closing the duct 15 is provided at a connection portion between the duct 15 and the evaporator case 9.

  The evaporator case 9 is connected to a duct 18 that guides air in the vehicle interior (inside air) introduced from the inside air introduction port 17 into the evaporator case 9. A valve 19 that can open and close the duct 18 is provided at a connection portion between the duct 18 and the evaporator case 9.

  Further, the evaporator case 9 is connected to a duct 21 for blowing the conditioned air cooled by passing through the evaporator 8 from the air outlet 20 into the passenger compartment 10. A valve 22 capable of opening and closing the duct 21 is provided at a connection portion between the duct 21 and the evaporator case 9.

  These valves 16, 19, and 22 are closed by a control device 30 to be described later after the air conditioner cooler operation is stopped, and the evaporator case 9 is hermetically sealed to dehumidify the evaporator case 9 by the dehumidifier 6. It is efficient.

  A humidity sensor 13 is provided in the evaporator case 9. The humidity sensor 13 detects the relative humidity of the evaporator case 9 and outputs it to the control device 30 as a humidity signal.

  Next, the control device 30 of the present embodiment will be described. The control device (air conditioner ECU) 30 includes a CPU, a ROM and a RAM, and peripheral circuits such as a drive circuit, and controls an air conditioner (not shown) to control the air conditioning in the passenger compartment 10. .

  A humidity sensor 13, an evaporator temperature sensor 23, an outside air temperature sensor 24, an engine ECU 31, and a battery voltage alarm 32 are connected to the input side of the control device 30.

  The evaporator temperature sensor 23 is disposed near the evaporator 8 in the evaporator case 9, detects the temperature of the evaporator 8, and outputs a detection signal to the control device 30. The outside air temperature sensor 24 detects the air temperature outside the vehicle and outputs a detection signal to the control device 30. The engine ECU 31 is a controller that controls an engine (not shown) that is a power source of the vehicle. In the present embodiment, the engine ECU 31 outputs a signal indicating that the engine has stopped to the control device 30. The battery voltage alarm device 32 outputs an abnormal signal to the control device 30 when the voltage of an in-vehicle battery (not shown) that is a driving power source of the dehumidifier 6 becomes an abnormal value equal to or less than a threshold value.

  Valves 16, 19, 22, a dehumidifier 6 and a blower 25 are connected to the output side of the control device 30. The valves 16, 19, and 22 are controlled to be opened and closed by the control device 30, and communicate and block the ducts 15, 18, and 21, respectively. The dehumidifier 6 is applied or stopped with a DC voltage required for the dehumidifying operation by the control device 30.

  The blower 25 is provided in an air conditioner (not shown) and is driven by a blower voltage provided by the control device 30. Thereby, the air blower 25 blows the outside air from the outside air introduction port 14 or the inside air from the inside air introduction port 17 to the evaporator 8 and blows it out into the vehicle compartment 10 from the blowout port 20 as conditioned air.

  Next, the operation of this embodiment will be described. The control device 30 is supplied with power from an in-vehicle battery (not shown) and executes a control program to control the dehumidifying device. FIG. 5 is a flowchart showing a control routine of the dehumidifier when the air conditioner is operating as a cooler.

  In step S100, a humidity signal is read from the humidity sensor 13 that detects the humidity in the evaporator case 9. In the next step S110, it is detected that the cooler is operating from the air conditioning control mode of the control device 30 itself, and the process proceeds to step S120. At this time, if the cooler is not operating in winter, the ambient atmosphere around the evaporator 8 is regarded as not having high humidity, and the dehumidifier 6 is not operated.

  If it is detected in step S110 that the cooler operation is stopped, the process proceeds to a control routine of FIG.

  In step S120, the valves 16, 19, and 22 are kept open according to the operation of the air conditioner, and the dehumidifier 6 is operated while the detected humidity exceeds the threshold, and the humidity is below the threshold. Then, the applied voltage is turned off and the operation is stopped. As this threshold value, a value that is humidity at which generation of germs is suppressed, 50% RH, is set.

  Thereby, during the cooler operation of the air conditioner, the dehumidifier 6 dehumidifies so that the humidity of the air around the evaporator 8 approaches the threshold value.

  At this time, the anode 4b side of the dehumidifier 6 is affected by cold air from the evaporator 8, while the cathode 4a side receives exhaust heat from the engine compartment 11, so that the entire dehumidifier 6 has a relatively high temperature. As a result, the dehumidifying efficiency of the dehumidifier 6 is relatively high.

  Since the surface portions of the proton conducting electrolyte membrane 1 that are not covered with the electrodes 4a and 4b are respectively covered with the heat insulating materials 5a and 5b, the proton conducting type due to the exhaust heat of the engine chamber 11 on the cathode 4b side. Drying of the electrolyte membrane 1 can be suppressed, and the influence of cooling by the evaporator 8 on the anode 4a side can be reduced. Therefore, it is possible to suppress a decrease in operating efficiency of the dehumidifier 6.

  Next, the operation of the dehumidifier 6 after stopping the cooler operation of the air conditioner will be described according to the control routine of FIG.

  In step S200, the stop of the air conditioner cooler operation is sensed. Specifically, when the control device 30 itself as the air conditioner ECU stops the operation of the evaporator 8 or when an engine stop signal is output from the engine ECU 31, the control device 30 senses the stop of the cooler operation.

  Next, in step S210, the air blowing from the blower 25 is continued for a predetermined time. This continuation time is defined as the time when the evaporator temperature, which is the temperature inside the evaporator case 9 detected by the evaporator temperature sensor 23, coincides with or becomes a value close to the outside air temperature detected by the outside air temperature sensor 24. Is set.

  As a result, the temperature of the evaporator 8, which is at a low temperature immediately after the operation is stopped, can be quickly raised by applying the inside air or the outside air to the evaporator 8, and the dehumidifying efficiency of the dehumidifier 6 can be improved.

  Next, in step S220, after the temperature in the evaporator case 9 rises, the dehumidifier 6 is operated by applying a voltage to the dehumidifier 6, and in the next step S230, all the valves 16, 19, and 22 are closed. State. As a result, the evaporator case 9 is sealed.

  In the next step S240, the humidity signal is read from the humidity sensor 13. In step S250, it is determined whether there is an abnormality in the battery voltage from the battery voltage alarm 32. If there is an abnormality in the battery voltage, the process proceeds to step S270, the operation of the dehumidifier 6 is stopped, and the control routine is ended.

  If the battery voltage is not abnormal, the operation of the dehumidifier 6 is continued until the detected humidity falls below a threshold value (for example, 50% RH) in step S260, and dehumidification occurs when the humidity falls below the threshold value. The voltage application to the device 6 is turned off to stop the dehumidifying operation, and the control routine is terminated.

The trial calculation result of the dehumidification capability of the dehumidifier 6 which operate | moves as mentioned above is demonstrated. In addition, the dehumidifying capacity based on the following calculation is based on the assumption that the amount of water in the proton conducting electrolyte membrane 1 constituting the dehumidifier 6 is always maintained at an optimum amount for proton (H ⁺ ) conduction. .

A current of 10 A (current density of 0.4 A / cm ² ) is applied to the electrode area of 25 cm ² to determine the amount of dehumidification per minute (molar amount of water molecules).

<Electrolysis only>
1A = 1C / sec, the amount of electricity of 1 mol of hydrogen ions is 96485C (Coulomb), 10A × 60 sec ÷ 96485C ÷ 2 = 3.11 × 10 ⁻³ mol of water molecules are drained by electrolysis.

<Only accompanying water>
When electrolysis (water electrolysis) is performed, N = 4.5 is taken as an average as N mole accompanying water when 1 mol of H ⁺ moves inside the electrolyte from the anode 4b side to the cathode 4a side. . Therefore, the accompanying water when electrolyzing 1 mol of water is 2 × 4.5 = 9 mol.

Therefore, when the dehumidification amount by electrolysis is 3.11 × 10 ⁻³ mol, the dehumidification amount by the accompanying water is 3.11 × 10 ⁻³ × 9 = 2.80 × 10 ⁻² mol.

From the above, the total dehumidification amount per minute is 3.11 × 10 ⁻³ + 2.80 × 10 ⁻² = 3.11 × 10 ⁻² mol / min.

When the total amount of dehumidification per minute is converted into weight units, it becomes 3.11 × 10 ⁻² × 18 = 0.560 g / min. The size of the evaporator case 9 is, for example, 0.4 m × 0.4 m × 0.2 m = 0.032 m ³ , and the interior space 10 of the small automobile is, for example, 1.865 m × 1.390 m × 1.270 m = 3.29 m. ^{If 3} were, their spatial internal temperature 40 ° C., assuming a relative humidity of 100%, the water content of 51.2g per 1 m ³ is contained inside the evaporator case 9, 51.2 × 0.032 = 1 .64 g of water is present, and the vehicle interior 10 contains 51.2 × 3.29 = 168.45 g of water.

  Assuming that the enclosed space is dehumidified with the dehumidifying capacity calculated above, the inside of the evaporator case 9 is 1.64 ÷ 0.560 = 2.93 minutes, and the relative humidity can be dehumidified from 100% to 0% in about 3 minutes. Become.

  In the case of a closed system space in a vehicle, 168.45 ÷ 0.56 = 300.8 minutes, which is a calculation result that can be dehumidified from 100% to 0% relative humidity in about 5 hours.

  The estimated amount of dehumidification can be easily increased by increasing the current value flowing through the electrodes by increasing the electrode area or increasing the number of dehumidifiers.

  Moreover, since the dehumidifier 6 has no mechanically operating portion, it has low noise and low energy loss.

  Further, not only the inside of the evaporator case 9 but also the piping, the air-conditioner blowing portion, and the vehicle interior 10 space can be dehumidified without lowering the vehicle interior temperature.

(Other embodiments)
(1) In the above embodiment, an example in which an engine is used as a power source of the vehicle, such as an engine vehicle or a hybrid vehicle, is shown, but the present invention is not limited to this, and a fuel cell vehicle or an electric vehicle may be used. In this case, the power chamber 11 to which the cathode 4a of the dehumidifier 6 is opened is a chamber in which a fuel cell stack and a motor driving battery are stored.

  (2) The drive power source of the dehumidifier 6 uses an auxiliary battery in an engine vehicle or a hybrid vehicle. However, the present invention is not limited to this, and a fuel cell stack of a fuel cell vehicle or a battery of an electric vehicle is used. Furthermore, the dehumidifier 6 can be turned on or off by detecting an output voltage abnormality of the fuel cell stack or the electric vehicle battery.

  (3) In the said embodiment, although the operation continuation time of the air blower 25 after the cooler operation stop in S210 showed the example which determines an operation end time according to the difference of evaporator temperature and external temperature, it is not restricted to this. The operation continuation time may be a predetermined constant value. Alternatively, if duration = 0, that is, if the cooler operation stop is detected, the blower 25 may not be blown, and the dehumidifier 6 may be started immediately.

  (4) In the above embodiment, the example in which the operation of the dehumidifier 6 after the cooler operation is stopped is continued until the humidity in the evaporator case 9 falls below the threshold value as shown in S240 and S260. Not limited thereto, the operation duration time of the dehumidifier 6 may be set to a constant value in advance. This set value can be experimentally determined in advance in consideration of various vehicle environments.

It is a figure which shows the basic structure of the dehumidifier of embodiment, (a) is a perspective view, (b) is sectional drawing. It is a figure which shows schematic structure of embodiment. It is sectional drawing of the dehumidifier part in FIG. It is a figure which shows the structure of the control system of embodiment. It is a flowchart which shows the control routine during the cooler action | operation of embodiment. It is a flowchart which shows the control routine after the cooler operation stop of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Proton conduction type electrolyte membrane, 4a ... Cathode, 4b ... Anode, 6 ... Dehumidifier,
9 ... Evaporator case, 9a ... Mounting duct, 11 ... Engine room (power room).

Claims (8)

A dehumidifier (6) comprising a proton conducting electrolyte membrane (1), an anode (4b) formed on one surface of the proton conducting electrolyte membrane, and a cathode (4a) formed on the other surface; ,
A control device (30) for controlling voltage application of positive polarity to the anode and negative polarity to the cathode;
The dehumidifier is provided in an evaporator case (9) for storing an evaporator (8) provided in an air conditioner of a vehicle, and is connected to an interior of the evaporator case and a power chamber (11) for storing a power source of the vehicle. (9a) The vehicle dehumidifying device is arranged such that the anode side is opened inside the evaporator case and the cathode side is opened to the power chamber. The surface portion of the proton-conducting electrolyte membrane where the anode and the cathode are formed is covered with a heat insulating material (5a, 5b) where the surface is not covered with the electrode. The vehicle dehumidifying device according to claim 1. The evaporator case is provided with openable and closable valves (16, 19, 22) at the openings of the inlet and the outlet of the wind passing through the evaporator,
3. The vehicle dehumidifying device according to claim 1, wherein the control device closes each valve during operation of the dehumidifier. 4. A humidity sensor (13) for detecting the humidity in the evaporator case;
The dehumidifier for a vehicle according to any one of claims 1 to 3, wherein the control device operates the dehumidifier so that the detected humidity falls below a set threshold value. The control device continues to blow air to the evaporator for the duration of the blowing period after the operation of at least one of the power source of the vehicle and the evaporator stops, and stops the blowing after the duration of the blowing period ends. The dehumidifier for a vehicle according to any one of claims 1 to 4, wherein the operation of the dehumidifier is started at the same time. The dehumidifying device for a vehicle according to claim 5, wherein the ventilation duration is a constant value set in advance. An outside air temperature sensor (24) for detecting the temperature outside the passenger compartment, and an evaporator temperature sensor (23) for detecting the evaporator temperature inside the evaporator case,
The dehumidifying device for a vehicle according to claim 5, wherein the control device sets a time when the difference between the outside air temperature and the evaporator temperature is equal to or less than a threshold value as an end time of the air blowing duration. A battery voltage alarm (32) for monitoring the voltage of the battery supplying the driving power for the dehumidifier;
8. The vehicle dehumidification according to any one of claims 1 to 7, wherein when the battery voltage alarm is output from the battery voltage alarm device, the control device stops the voltage application to the dehumidifier. apparatus.

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