JP5235708B2 - Air conditioner for vehicles - Google Patents

Description

  The present invention relates to a vehicle air conditioner that prevents the growth of mold in the vicinity of an evaporator serving as a heat exchanger mounted on a vehicle and improves the comfort of passengers by purifying the air blown into the passenger compartment. .

  Conventionally, a technology for automatically switching between inside and outside air based on various conditions is widely known. For example, Patent Document 1 performs this in accordance with the degree of outside air contamination. This is to improve passenger comfort by automatically switching to the inside air circulation mode when the outside air is highly polluted.

  By the way, in the case of a vehicle air conditioner, mold and bacteria adhere to the evaporator surface and the vicinity of the evaporator when the evaporator disposed in the air passage that is provided in the refrigeration circuit and leads to the passenger compartment gets wet. These molds and bacteria may cause bad odors. In order to suppress mold growth, the moisture necessary for mold growth must be kept low by drying. Accordingly, it is necessary to appropriately perform the inside / outside air switching control and the blower air volume control not only depending on the degree of contamination of the outside air but also depending on the wetness of the evaporator.

JP 2003-72353 A

  Therefore, an object of the present invention is to satisfy the above-described requirements, and can control the humidity in the vicinity of the evaporator appropriately at an optimal timing, thereby suppressing the growth of mold and sterilizing the vehicle. It is to provide an air conditioner.

  In order to solve the above problems, in the present invention, the humidity in the vicinity of the evaporator as a heat exchanger disposed in the air passage is predicted using a humidity sensor or outside air temperature humidity, the evaporator outlet air temperature, The humidity is stored in a storage device at regular intervals, for example, and the inside and outside air switching control is performed by using a plurality of stored past humidity and humidity measured in real time to ventilate the interior of the vehicle. The bad odor which becomes and is suppressed.

That is, the vehicle air conditioner according to the present invention is a vehicle air conditioner including switching means for switching between intake of outside air and intake of air in the vehicle interior, and a heat exchanger that cools the air blown into the vehicle interior. ,
Heat exchanger vicinity humidity acquisition means for detecting or estimating the humidity in the vicinity of the heat exchanger, humidity storage means for storing the humidity acquired by the heat exchanger vicinity humidity acquisition means, and the current heat exchanger vicinity humidity a history reference humidity calculating means for calculating a history reference humidity based on a preset past the heat exchanger vicinity humidity weighted by weighting factors, preset the calculated history reference humidity by the reference humidity calculating means A first heat exchanger state determination means for determining a wet state of the heat exchanger by comparing with a predetermined value A;
Heat exchanger drying means for drying the heat exchanger and the periphery of the heat exchanger, mold, bacteria in the vicinity of the heat exchanger based on the determination result by the first heat exchanger state determination means when the air conditioning is off or the vehicle is parked The heat exchanger sterilization means for sterilizing etc. performs at least one operation. Examples of the heat exchanger include an evaporator disposed in an air passage provided in the refrigeration circuit and leading to the vehicle interior.

In the vehicle air conditioner according to the present invention having the first heat exchanger state determination means described above, the outside air temperature and humidity acquisition means for acquiring the temperature and humidity of the outside air that is the outside air of the passenger compartment, and the air in the passenger compartment Internal air temperature / humidity acquisition means for acquiring the temperature and humidity of the internal air, and intake air dew point temperature estimation for estimating the dew point temperature of the intake air based on the information of the external air temperature / humidity acquisition means or the internal air temperature / humidity acquisition means according to the inside / outside air introduction mode Means, heat exchanger outlet air temperature detecting means for detecting the temperature of the outlet air of the heat exchanger, at least the suction air dew point temperature estimated by the suction air dew point temperature estimating means and the heat exchanger outlet air temperature detection And a second heat exchanger state determination means for determining the wet state of the heat exchanger by comparing the heat exchanger outlet air temperature detected by the means. To,
A third heat exchanger state determination unit that determines a wet state of the heat exchanger by comparing determination results by both of the first heat exchanger state determination unit and the second heat exchanger state determination unit; Have
Heat exchanger drying means for drying the heat exchanger and the periphery of the heat exchanger based on the determination result by the third heat exchanger state determination means when the air conditioner is turned off or when the vehicle is parked, mold, bacteria near the heat exchanger It is possible to adopt a configuration characterized in that at least one operation is performed among heat exchanger sterilization means for sterilizing the above.

  In such a vehicle air conditioner according to the present invention, the history reference humidity calculated based on the current heat exchanger vicinity humidity and the past heat exchanger vicinity humidity weighted by a preset weighting factor, The predetermined value A set in advance is compared with the first heat exchanger state determining means to determine the wet state of the heat exchanger. The wet state of the heat exchanger can also be determined by the second heat exchanger state determination means. Furthermore, the wet state of the heat exchanger can also be determined by the third heat exchanger state determination unit that compares the determination results of both the first heat exchanger state determination unit and the second heat exchanger state determination unit. it can. Based on this determination result, at least one of the heat exchanger drying means and the heat exchanger sterilization means is executed at an optimal timing when the air conditioning is off or when the vehicle is parked. By executing the operation of the heat exchanger drying means, the heat exchanger and the surroundings of the heat exchanger are dried to suppress the growth of mold, and sterilization is also possible by executing the operation of the heat exchanger sterilizing means. By suppressing the growth and disinfection of mold, malodor caused by them is suppressed.

  At least one of the heat exchanger drying means and the heat exchanger sterilization means can be operated for an appropriate time determined by the drying time determination means or the sterilization time determination means.

  For example, at least one of the heat exchanger drying means and the heat exchanger sterilization means is operated until at least the history reference humidity is equal to or lower than a predetermined value B lower than the predetermined value A, or for a predetermined period of time. Can be made to run. Alternatively, the operation of at least one of the heat exchanger drying means and the heat exchanger sterilization means is performed until at least the heat exchanger outlet air temperature is higher than the suction air dew point temperature, or a predetermined constant value. Can be run for hours. The predetermined value B can be set according to environmental conditions, for example, the average temperature and humidity depending on the season. Further, the fixed execution time can be changed according to the vehicle type and the size of the air conditioning unit.

  The heat exchanger drying means can be configured to simply turn on the blower and send the air to the heat exchanger. Alternatively, dry air having a lower humidity than the outside air and the cabin air can be selectively used. It is also possible to comprise means for drying the heat exchanger by supplying it to the heat exchanger. Alternatively, as the heat exchanger drying means, the heat exchanger can be dried by heating the heat exchanger. About heating, it can dry by heating directly an evaporator as a heat exchanger using a compressor discharge refrigerant gas (hot gas) or a heat pump, and it is arranged downstream of an evaporator. It can also be dried by heating the evaporator using the heat of the heater core.

  In the heat exchanger sterilization means, the heat exchanger can be sterilized by heating the heat exchanger or using at least one of ozone, ions, a photocatalyst, and ultraviolet rays. For example, the evaporator as a heat exchanger can be heated to a high temperature by using hot gas and the heat of the heater core to be sterilized. Further, the evaporator can be sterilized by an ozone cleaning device. Further, the evaporator can be sterilized by the ion air purification device. It can also be sterilized by spraying an evaporator containing a photocatalyst or spraying the photocatalyst on the evaporator and irradiating with ultraviolet rays. Furthermore, it can also be sterilized by directly irradiating the evaporator with ultraviolet rays.

  Whether the air conditioning is off or whether the vehicle is parked can be determined by, for example, turning on / off the vehicle engine or turning on / off the air conditioner.

  In addition, the outside air humidity necessary for estimating the intake air dew point temperature may be detected by an outside air humidity sensor, or may be acquired from the outside of the vehicle via an external information receiving device mounted on the vehicle. It is also possible to make it. As external information, it is possible to refer to weather data (precipitation, temperature, humidity, etc.) that can be acquired from a meteorological satellite, the Meteorological Agency, an electric power company, etc. via a receiving device mounted on the vehicle.

  According to the vehicle air conditioner of the present invention, the wetness of the heat exchanger is determined based on the history reference humidity near the heat exchanger or / and the suction air dew point temperature and the heat exchanger outlet air temperature, and the drying mode or / and By executing the operation in the sterilization mode when the air conditioner is turned off or when the vehicle is parked, generation of mold, bacteria near the heat exchanger, and breeding can be suppressed. As a result, it is possible to prevent malodor caused by mold and bacteria, which has been a problem until now, and to improve passenger comfort when using the air conditioner.

It is a principal part schematic block diagram of the vehicle air conditioner which concerns on one embodiment of this invention. It is a flowchart which shows an example of control of the apparatus of FIG. It is a flowchart which shows the reference example of control of the apparatus of FIG. 6 is a flowchart showing yet another example of control of the apparatus in FIG. 1. It is a block diagram which shows an example of control of the apparatus of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 mainly shows mechanical components in a main part of a vehicle air conditioner according to an embodiment of the present invention. The vehicle air conditioner is an air passage for sending temperature-controlled air into a vehicle interior. 1 and a refrigeration circuit 2 (vapor compression refrigeration cycle) in which refrigerant is circulated. The refrigeration circuit 2 is driven by a vehicle engine as a drive source (not shown, but another drive source such as an electric motor is also possible) via an electromagnetic clutch 3 and the like, and variable capacity compression for compressing refrigerant. A radiator 5 (for example, a condenser) that cools the refrigerant by heat exchange between the high-temperature and high-pressure refrigerant discharged from the compressor 4 and the compressor 4 and external air, and expansion that adiabatically expands the refrigerant that has flowed out of the radiator 5 Means 6 (expansion valve), and an evaporator 7 as a heat exchanger that evaporates the refrigerant from the expansion means 6 and is disposed in the air passage 1 and cools the conditioned air sent thereto. The refrigerant flowing out of the evaporator 7 is sent to the compressor 4 and compressed again. On the inlet side of the air passage 1, switching is performed to switch intake air between outside air (outside air) 9 introduced from the outside air inlet 8 side and inside air (inside air) 11 introduced from the inside air inlet 10 side. An inside / outside air switching damper 12 is provided as means. The introduced air is sucked in by the blower 13, supplied toward the evaporator 7, and cooled by heat exchange with the refrigerant by the evaporator 7. The air that has passed through the evaporator 7 passes or bypasses a heater core (not shown) as necessary, and the temperature-controlled air is sent to the vehicle interior through the selected outlet.

In this embodiment, an evaporator outlet air temperature / humidity sensor 14 is provided on the outlet side of the evaporator 7, and the humidity data acquired by the evaporator outlet air temperature / humidity sensor 14 is stored in the humidity storage means. The humidity storage means is incorporated in the air conditioning control device 15. In this embodiment, the humidity in the vicinity of the evaporator is obtained through the humidity sensor function of the evaporator outlet air temperature / humidity sensor 14, but in the case of no humidity sensor, the humidity in the vicinity of the evaporator is estimated. It is possible to obtain humidity by means of In order to estimate the humidity near the evaporator, for example, the following environmental information is acquired.
(1) Vehicle side information (outside air temperature, passenger compartment temperature, intake air temperature, etc.)
(2) External information (precipitation, local temperature, humidity, etc.)
The acquired humidity in the vicinity of the evaporator is stored in humidity storage means that can temporarily store humidity data. The history reference humidity is estimated using a plurality of stored past humidity and the humidity acquired in real time as described later, and the heat exchanger drying control means and / or the heat exchanger sterilization means are operated.

  In the above embodiment, the vapor compression refrigeration cycle uses a chlorofluorocarbon refrigerant, but may be a carbon dioxide refrigerant. The vapor compression refrigeration cycle is equipped with a clutch capable of controlling the drive of the compressor, but may be clutchless. In addition to the mechanical expansion valve, an electronic expansion valve, a temperature expansion valve, a differential pressure expansion valve, or the like may be used as the expansion means of the compression refrigeration cycle. In the above-described vapor compression refrigeration cycle, an external variable capacity compressor that can change the capacity of the compressor by an external control signal is used. However, a fixed capacity compressor may be used. The compressor of the vapor compression refrigeration cycle may be a compressor driven by an engine, a motor driven by an electric motor, or a hybrid compressor that can be selectively or simultaneously driven by both drive sources. In addition, for external information to estimate humidity, refer to meteorological data (precipitation, local temperature, humidity, etc.) that can be obtained from meteorological satellites, the Japan Meteorological Agency, electric power companies, etc. via a receiver mounted on the vehicle can do.

  Next, the control in this embodiment will be described with reference to the control flow diagrams shown in FIGS. 2 to 4 and the control block diagram shown in FIG.

History reference humidity calculation means (when there is a humidity sensor near the evaporator)
As information obtained from the vehicle air conditioner, the current evaporator vicinity humidity (Hn) and a plurality of past evaporator vicinity humidity (H _n−1 , H _{n− 2} ,. With reference to at least one of H ₁ , the history reference humidity (He) of the evaporator is calculated.
_{He = f (Hn, H n} -1, H n-2, ···, H 1)
The details of the above formula are shown in the following formula 1.

In the above formula 1, a indicates a weighting factor for weighting, and the weighting factor a satisfies 1> a _n > a _n-1 > a _n-2 >.

  Thus, the purpose of referring to the history of the humidity near the evaporator in the present invention is to predict the humidity accumulated in the past near the evaporator and in the air conditioning unit including the evaporator by considering the past humidity. .

History reference humidity calculation means (when there is no humidity sensor near the evaporator)
Information obtained from the vehicle air conditioner includes the outside air temperature (Tamb), the passenger compartment temperature (Tin), the evaporator outlet air temperature (Teva), and the outside air humidity ( Hamb) is used to estimate the humidity near the evaporator (Hn) and calculate the history reference humidity (He) near the evaporator.
Hn = f (Teva, Tamb, Tin, Hamb)
He = f (Hn, H _n-1 , H _n-2 , ..., H ₁ )

Dew point temperature estimation means The intake air dew point temperature (Tdew) is estimated from the outside air temperature (Tamb), the outside air humidity (Hamb), the passenger compartment temperature (Tin), the passenger compartment humidity (Hin), and the intake signal (IS).
In the outside air introduction mode, the intake air dew point temperature is estimated from the outside air temperature (Tamb) and the outside air humidity (Hamb).
・ Tdew = f (Tamb, Hamb)
In the inside air introduction mode, the intake air dew point temperature is estimated from the vehicle interior temperature (Tin) and the vehicle interior humidity (Hin).
・ Tdew = f (Tin, Hin)

Evaporator outlet air temperature detection means For example, an evaporator outlet air temperature (Teva) is detected by a fin sensor provided on the evaporator surface.

Vehicle and air conditioner state determination means It is determined whether or not the vehicle is parked because the engine is on or off.
Further, it is determined whether or not the air conditioner is used because the air conditioner is on or off.
Such on / off of the engine or the air conditioner may be performed by an external signal from a wireless remote controller or the like in addition to the operation of the ignition switch and the operation of the air conditioner switch.

First heat exchanger state determination means When the history reference humidity (He) calculated by the history reference humidity calculation means is greater than or equal to a predetermined value A (when He ≧ A), heat exchanger sterilization means is executed. Further, when the history reference humidity (He) is less than the predetermined value A and is B or more (when A> He ≧ B), the heat exchanger drying means is executed. Further, when the history reference humidity (He) is equal to or higher than the predetermined value A (when He ≧ A) in the state where the heat exchanger drying means is being executed, the heat exchanger sterilization means is also executed. To do.

Second heat exchanger state determination means The evaporator gets wet when the following conditions are obtained from the intake air dew point temperature (Tdew) and evaporator outlet air temperature (Teva) obtained by the dew point temperature estimation means and the evaporator outlet air temperature detection means. Whether it is dry or not. Here, X is a positive predetermined value, and when the temperature difference between Tdew and Teva becomes a certain level or more when the engine is turned off or the air conditioner is turned off, the heat exchanger sterilization means and / or the heat exchanger drying means are executed. For this purpose, an optimum value (for example, X = 5) is used.
・ When Tdew ≧ Teva and Tdew−Teva <X and the intake air humidity (Hamb in the outside air introduction mode, Hin in the inside air introduction mode) is less than the predetermined value A, the heat exchanger sterilization means is executed. To do.
When Tdew ≧ Teva, Tdew−Teva <X, and the intake air humidity (Hamb in the outside air introduction mode, Hin in the inside air introduction mode) is equal to or greater than the predetermined value A, the heat exchanger drying means is executed. .
When Tdew ≧ Teva and Tdew−Teva ≧ X, heat exchanger sterilization means and heat exchanger drying means are executed.

Third heat exchanger state determination means The third heat exchanger state determination means obtains the results obtained from the first and second heat exchanger state determination means from the air conditioning control device, and heat exchanger sterilization based on the results. Means, heat exchanger drying means, or both.
When the first heat exchanger state determination means is He ≧ A and the second heat exchanger state determination means is Tdew <Teva, the heat exchanger sterilization means is executed.
When the first heat exchanger state determination means is He <A and the second heat exchanger state determination means is Tdew ≧ Teva, the heat exchanger drying means is executed.
When the first heat exchanger state determination means is He ≧ A and the second heat exchanger state determination means is Tdew ≧ Teva, both the heat exchanger sterilization means and the heat exchanger drying means are executed.

Heat exchanger drying means The first and second heat exchanger state determination means determine that the evaporator is wet, and when the air conditioner is off or parked, the evaporator is dry.
(1) The blower 13 is turned on and air is supplied to the evaporator for drying.
(2) It is determined by determining which of the outside air and the inside air is dry, and drying the air by selectively supplying the air that is drier to the evaporator.
(3) Drying by directly heating the evaporator using a compressor discharge refrigerant gas (hot gas) or a heat pump.
(4) Drying is performed by heating the evaporator using the heat of the heater core.

Heat exchanger sterilization means The heat exchanger state determination means determines that the evaporator is wet, and sterilizes the evaporator by one of the following methods when the air conditioner is off or parked.
(1) The evaporator is heated to a high temperature using the hot gas and the heat of the heater core to be sterilized.
(2) The evaporator is sterilized by an ozone cleaning device.
(3) The evaporator is sterilized by an ion air purification device.
(4) An evaporator containing a photocatalyst or a photocatalyst is sprayed on the evaporator and sterilized by irradiation with ultraviolet rays.
(5) The bacteria are sterilized by directly irradiating the evaporator with ultraviolet rays.

Drying time determination means and sterilization time determination means The execution time of the heat exchanger drying means or the heat exchanger sterilization means is determined.
The execution time determination method uses at least one of the following methods.
(1) The process is executed until the history reference humidity becomes equal to or lower than a predetermined value B (B is a value smaller than the predetermined value A).
(2) Execute until the evaporator outlet air temperature is higher than the inside / outside air dew point temperature.
(3) Execute for a predetermined time (for example, about 15 minutes). This time can be arbitrarily set according to the size of the air conditioning unit for each vehicle. It is preferable that an electric vehicle equipped with a power storage function is limited to a time during which the amount of power used can be executed within a few percent.
(4) In a vehicle capable of storing electric power, such as an electric vehicle, the determination is performed under the determination condition (1) or (2) even after the engine is stopped or immediately before boarding.
The predetermined value B in (1) may be changed according to environmental conditions. For example, it can be set by the average temperature and humidity for each season (for example, the predetermined value B is set lower in the summer than in the winter).

FIG. 2 shows an example of the control flow.
Step S1: It is determined by the vehicle and the air conditioner state determination means whether the vehicle is parked or air conditioning is being used.
- Step S2: If it is determined that the time of parking during or conditioning off in step S1, the vehicle and the outside from the data (Tamb, Hamb, Teva, Heva , H n, H n-1, H n-2, ···, H ₁ , Tin, Hin).
Step S3: History reference humidity (He) is calculated by the history reference humidity calculation means.
Step S4: The first heat exchanger state determination means determines whether or not the evaporator is condensed.
Steps S5, S6, and S7: When it is determined in step S4 that condensation has occurred, at least one operation of the heat exchanger drying means or the heat exchanger sterilization means is performed. The time for executing the heat exchanger drying means and the heat exchanger sterilization means is determined and determined by the drying time determination means and the sterilization time determination means. If it is determined in step S4 that there is no condensation, the process returns to step S1.

FIG. 3 shows a reference example of the control flow.
Step S11: The vehicle and the air conditioner state determination means determine whether the vehicle is parked or air conditioning is being used.
Step S12: If it is determined in step S11 that the vehicle is parked or the air conditioner is off, data (Tamb, Hamb, Tin, Hin, IS) is read from the vehicle and the outside.
Step S13: The dew point temperature (Tdew) of the intake air is calculated by the dew point temperature estimating means.
Step S14: The second heat exchanger state determination means determines whether or not the evaporator is condensed.
Steps S15, S16, S17: When it is determined in step S14 that condensation has occurred, at least one operation of the heat exchanger drying means or the heat exchanger sterilization means is performed. The time for executing the heat exchanger drying means and the heat exchanger sterilization means is determined and determined by the drying time determination means and the sterilization time determination means. If it is determined in step S14 that there is no condensation, the process returns to step S11.

FIG. 4 shows still another example of the control flow.
Step S21: It is determined whether the vehicle and the air conditioner state determining means are parked or using air conditioning.
Step S22: If it is determined that the time of parking during or conditioning off at step S21, the vehicle and the outside from the data (Tamb, Hamb, Teva, Heva , H n, H n-1, H n-2, ···, H _1, Tin, reads Hin, a, IS) a.
Step S23: The history reference humidity (He) is calculated by the history reference humidity calculation means.
Step S24: It is determined by the first heat exchanger state determination means whether or not the evaporator is condensed.
Steps S25 and S26: When it is determined in step S24 that there is no condensation (He <A), and when it is determined that condensation is present (He ≧ A), each state determination result is stored in the storage means. .
Steps S27 and S28: The dew point temperature (Tdew) of the intake air is calculated by the dew point temperature estimating means.
Steps S29 and S30: The data (Tdew) calculated in steps S27 and S28 and Teva are read.
Steps S31 and S32: The second heat exchanger state determination means determines whether or not the evaporator is condensed.
Steps S33, S34, and S35: The state determination results at steps S31 and S32 are stored in the storage unit. At this time, if it is determined in step S31 that there is no condensation, that is, it is determined in step S24 that there is no condensation by the first heat exchanger state determination means, and in step S31, the second heat exchanger state is determined. If it is determined by the means that there is no condensation, the process returns to step S21.
Step S36: The state determination result saved in steps S33, S34, and S35 is read.
Step S37: The third heat exchanger state determination means determines the wet state of the evaporator.
Steps S38, S39, and S40: The heat exchanger drying means, the heat exchanger sterilization means, or both are operated according to the state determination result in step S37. The time for executing the heat exchanger drying means and the heat exchanger sterilization means is determined and determined by the drying time determination means and the sterilization time determination means. In the illustrated example, if He ≧ A and Tdew <Teva, the heat exchanger sterilization means is executed in step S38. If He <A and Tdew ≧ Teva, the heat exchanger drying means is executed in step S39. When ≧ A and Tdew ≧ Teva, the operation of both the heat exchanger drying means and the heat exchanger sterilization means is executed in step S40. Then, it returns to step S21.

  The present invention can be applied to any vehicle air conditioner in which an evaporator is disposed in an air passage leading to a vehicle interior.

DESCRIPTION OF SYMBOLS 1 Air passage 2 Refrigeration circuit 3 Electromagnetic clutch 4 Compressor 5 Radiator 6 Expansion means 7 Evaporator 8 as heat exchanger 8 Outside air introduction port 9 Outside air air 10 Inside air introduction port 11 Inside air introduction air 12 Inside / outside air switching as switching means Damper 13 Blower 14 Evaporator outlet air temperature and humidity sensor 15 Air conditioning controller

Claims (11)

In a vehicle air conditioner comprising switching means for switching between intake of outside air and intake of air inside a vehicle, and a heat exchanger that cools air blown into the vehicle interior,
Heat exchanger vicinity humidity acquisition means for detecting or estimating the humidity in the vicinity of the heat exchanger, humidity storage means for storing the humidity acquired by the heat exchanger vicinity humidity acquisition means, and the current heat exchanger vicinity humidity a history reference humidity calculating means for calculating a history reference humidity based on a preset past the heat exchanger vicinity humidity weighted by weighting factors, preset the calculated history reference humidity by the reference humidity calculating means A first heat exchanger state determination means for determining a wet state of the heat exchanger by comparing with a predetermined value A;
Heat exchanger drying means for drying the heat exchanger and the periphery of the heat exchanger, mold, bacteria in the vicinity of the heat exchanger based on the determination result by the first heat exchanger state determination means when the air conditioning is off or the vehicle is parked A vehicle air conditioner that performs at least one operation of heat exchanger sterilization means for sterilizing the above. Furthermore, the outside air temperature and humidity acquisition means for acquiring the temperature and humidity of the outside air that is the outside air of the vehicle interior, the inside temperature and humidity acquisition means for acquiring the temperature and humidity of the inside air that is the air of the vehicle interior, and the outside air temperature according to the inside and outside air introduction mode Intake air dew point temperature estimating means for estimating the dew point temperature of the intake air based on information of the humidity acquisition means or the internal temperature humidity acquisition means, and a heat exchanger outlet air temperature detection means for detecting the temperature of the outlet air of the heat exchanger And at least the suction air dew point temperature estimated by the suction air dew point temperature estimation means and the heat exchanger outlet air temperature detected by the heat exchanger outlet air temperature detection means, thereby wetting the heat exchanger. Having a second heat exchanger state determining means for determining the state,
A third heat exchanger state determination unit that determines a wet state of the heat exchanger by comparing determination results by both of the first heat exchanger state determination unit and the second heat exchanger state determination unit; Have
Heat exchanger drying means for drying the heat exchanger and the periphery of the heat exchanger based on the determination result by the third heat exchanger state determination means when the air conditioner is turned off or when the vehicle is parked, mold, bacteria near the heat exchanger 2. The vehicle air conditioner according to claim 1, wherein at least one operation is performed among heat exchanger sterilization means for sterilizing a heat exchanger. The vehicle air conditioner according to claim 2 , wherein an outside air humidity necessary for estimating the intake air dew point temperature is detected by an outside air humidity sensor. The vehicle air conditioner according to claim 2 , wherein the outside air humidity necessary for estimating the suction air dew point temperature is acquired from outside the vehicle via an external information receiving device mounted on the vehicle. The operation of at least one of the heat exchanger drying means and the heat exchanger sterilization means is performed until at least the heat exchanger outlet air temperature is higher than the suction air dew point temperature or a predetermined constant value. The vehicle air conditioner according to any one of claims 2 to 4 , which is executed for a time. At least one of the heat exchanger drying means and the heat exchanger sterilization means is operated until at least the history reference humidity falls below a predetermined value B lower than the predetermined value A, or for a predetermined period of time. The vehicle air conditioner according to any one of claims 1 to 4 , which is executed. At least one operation, run time is determined by the drying time determination means or sterilization time determination means of said heat exchanger drying means and said heat exchanger filtering unit, according to any of claims 1 to 6 Vehicle air conditioner. Said heat exchanger drying means, drying the heat exchanger by providing selectively the heat exchanger air humidity from one of the outside air and room air is dry low, any claim 1-7 A vehicle air conditioner according to claim 1. The vehicle air conditioner according to any one of claims 1 to 7 , wherein the heat exchanger drying means dries the heat exchanger by heating the heat exchanger. Said heat exchanger filtering unit, by heating the heat exchanger, or ozone, ions, sterilization of the heat exchanger by using a photocatalyst, at least one ultraviolet any of claims 1-9 A vehicle air conditioner according to claim 1. The vehicle air conditioner according to any one of claims 1 to 10 , wherein whether the air conditioning is off or whether the vehicle is parked is determined by turning on / off the vehicle engine or turning on / off the air conditioning device.

Images