Air-conditioning system for vehicle

Abstract

To provide an air-conditioning system for a vehicle capable of shortening a time for introducing outside air while preventing fogging of a window glass.SOLUTION: An air-conditioning system (100) for a vehicle (1) includes: an air conditioner (30) capable of blowing out outside air and inside air toward a windshield (2); a water absorption rate sensor (23) for measuring a water absorption rate of a water absorption film provided on a surface on a cabin side of the windshield; an outside air temperature humidity sensor (21) for measuring humidity of outside air; an inside air temperature humidity sensor (22) for measuring humidity of inside air; and a controller (10) configured to control the air conditioner. The controller is configured to: acquire humidity of air in the vicinity of the windshield on the basis of the humidity of outside air and the humidity of inside air; set a target water absorption rate so that the target water absorption rate becomes high when humidity of the air in the vicinity of the windshield is relatively high; and cause the air conditioner to execute dry control until the water absorption rate of the water absorption film becomes the target water absorption rate or lower.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vehicle air conditioning system.

Background Art

[0002] When the surface temperature of the vehicle-side of the window glass of a vehicle becomes below the dew point due to the temperature difference between the inside and outside of the vehicle compartment and the humidity inside the vehicle compartment, condensation occurs on the surface of the vehicle-side of the window glass. As a result, the window glass becomes fogged, which hinders the driver's visibility. Therefore, conventionally, the vehicle air conditioner has been used to blow low-humidity air introduced from outside the vehicle toward the surface of the vehicle-side of the window glass to evaporate the condensed water droplets, thereby removing the fog on the window glass.

[0003] Also, a technique for preventing the occurrence of condensation, which is the cause of fogging, by providing a water-absorbing film (water-absorbing film) on the surface of the vehicle-side of the window glass is also known. In a vehicle having a window glass on which such a water-absorbing film is formed, in order to dry the water absorbed by the water-absorbing film and restore the anti-fog performance, it has been proposed to partially introduce outside air during the running of the vehicle to dry and regenerate the water-absorbing film, and to perform outside air introduction for a predetermined time when it is determined that the vehicle has stopped (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when outside air is introduced for removing fog on the window glass or drying the water-absorbing film while the temperature outside the vehicle compartment is lower than that inside the vehicle compartment and the air conditioner is operating according to the set temperature set by the vehicle occupants, the temperature inside the vehicle compartment will decrease.

[0006] The present invention has been made to solve such problems, and an object thereof is to provide an air conditioning system for a vehicle that can prevent fogging of window glass while shortening the time for introducing outside air.

Means for Solving the Problems

[0007] In order to solve the above-described problems, the present invention provides an air conditioning system for a vehicle, including: an air conditioner capable of blowing out air introduced from outside the vehicle compartment and air taken in from inside the vehicle compartment toward the surface on the vehicle compartment side of the vehicle window glass; a water absorption rate sensor that measures the water absorption rate of a water absorption film provided on the surface on the vehicle compartment side of the vehicle window glass; an outside air humidity sensor that measures the humidity of the air outside the vehicle; an inside air humidity sensor that measures the humidity of the air inside the vehicle; and a controller configured to control the air conditioner. The controller obtains the humidity of the air near the surface on the vehicle compartment side of the vehicle window glass based on the humidity of the air outside the vehicle measured by the outside air humidity sensor and the humidity of the air inside the vehicle measured by the inside air humidity sensor. When the humidity of the air near the surface on the vehicle compartment side of the vehicle window glass is relatively high, the target water absorption rate is set so as to be higher than when the humidity of the air near the surface on the vehicle compartment side of the vehicle window glass is relatively low. The air conditioner is configured to execute drying control to blow out air including the air introduced from outside the vehicle compartment toward the surface on the vehicle compartment side of the vehicle window glass until the water absorption rate of the water absorption film measured by the water absorption rate sensor becomes equal to or lower than the target water absorption rate.

[0008] According to the present invention configured as described above, when the humidity of the air near the surface on the passenger compartment side of the vehicle window glass is relatively high, the controller sets the target water absorption rate so that the target water absorption rate is higher than when the humidity of the air near the surface on the passenger compartment side of the vehicle window glass is relatively low, and causes the air conditioner to perform drying control until the water absorption rate of the water absorption film becomes equal to or lower than the target water absorption rate. That is, when it is predicted that the execution time of the drying control will be long because the humidity of the air near the surface on the passenger compartment side of the vehicle window glass is high, by setting a high target water absorption rate for ending the drying control, it is possible to prevent the time until the end of the drying control from becoming long. Thereby, while preventing the window glass from fogging due to the drying control, it is possible to shorten the time for introducing outside air.

[0009] In the present invention, preferably, the humidity of the air near the surface on the passenger compartment side of the vehicle window glass is relative humidity.

[0010] According to the present invention configured as described above, since the target water absorption rate is set based on the relative humidity of the air near the surface on the passenger compartment side of the vehicle window glass, it is possible to appropriately reflect the drying ability of the air blown toward the vehicle window glass and set the target water absorption rate, and it is possible to surely achieve both prevention of fogging of the window glass by drying control and shortening of the time for introducing outside air.

[0011] In the present invention, preferably, an outside air temperature sensor that measures the temperature of the air outside the vehicle and an inside air temperature sensor that measures the temperature of the air inside the vehicle are provided, and the controller acquires the target temperature inside the vehicle, and based on the temperature of the air outside the vehicle measured by the outside air temperature sensor, the temperature of the air inside the vehicle measured by the inside air temperature sensor, and the target temperature, obtains the ratio of the air outside the vehicle in the air blown toward the surface on the passenger compartment side of the vehicle window glass that can achieve the target temperature when the heating output of the air conditioner is maximized, and based on the obtained ratio of the air outside the vehicle, the humidity of the air outside the vehicle, and the humidity of the air inside the vehicle, obtains the humidity of the air near the surface on the passenger compartment side of the vehicle window glass, and is configured to cause the air conditioner to perform drying control when the humidity of the air near the surface on the passenger compartment side of the vehicle window glass is less than a predetermined threshold.

[0012] According to the present invention configured as described above, the controller acquires the ratio of the outside air in the air blown toward the surface on the passenger compartment side of the vehicle window glass that can achieve the target temperature when the heating output of the air conditioner is maximized, based on the temperature of the outside air outside the passenger compartment, the temperature of the air inside the passenger compartment, and the target temperature inside the passenger compartment. Then, based on the acquired ratio of the outside air, the humidity of the outside air, and the humidity of the air inside the passenger compartment, the controller acquires the humidity of the air near the surface on the passenger compartment side of the vehicle window glass. When the humidity of the air near the surface on the passenger compartment side of the vehicle window glass is less than a predetermined threshold value, the controller causes the air conditioner to execute drying control. Therefore, drying control can be executed when it is possible to take in dry outside air without exceeding the maximum heating output of the air conditioner. Thereby, it is possible to prevent the window glass from fogging while avoiding a decrease in the temperature inside the passenger compartment.

[0013] In the present invention, preferably, the controller acquires the target temperature inside the passenger compartment. When the air conditioner circulates the air inside the passenger compartment without introducing the outside air, the controller acquires the required heating output necessary to achieve the target temperature. When the required heating output is less than a predetermined threshold value, the controller is configured to cause the air conditioner to execute drying control.

[0014] According to the present invention configured as described above, when the required heating output is less than a predetermined threshold value, the controller causes the air conditioner to execute drying control. Therefore, when there is room in the heating capacity of the air conditioner and drying control can prevent a decrease in the temperature inside the passenger compartment even if outside air is introduced by performing the drying control, the drying control can be executed. Thereby, it is possible to prevent the window glass from fogging while avoiding a decrease in the temperature inside the passenger compartment.

Effect of the Invention

[0015] According to the air conditioning system of the vehicle of the present invention, it is possible to shorten the time for introducing outside air while preventing the window glass from fogging.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0017] Hereinafter, with reference to the accompanying drawings, an air conditioning system for a vehicle according to an embodiment of the present invention will be described.

[0018] [System Configuration] First, with reference to FIGS. 1 and 2, the configuration of the air conditioning system of the vehicle according to the present embodiment will be described. FIG. 1 is an explanatory drawing of a vehicle equipped with the air conditioning system, and FIG. 2 is a block diagram of the vehicle's air conditioning system.

[0019] A vehicle 1 equipped with an air conditioning system 100 according to the present embodiment includes a front window 2. On the surface of the front window 2 on the passenger compartment side, a water absorption film 4, which is a water-absorbing film, is formed. As the water absorption film 4, existing technologies can be used. For example, a water-absorbing crosslinked resin layer or a ceramics layer is formed on the surface of the front window 2 on the passenger compartment side as the water absorption film 4.

[0020] The air conditioning system 100 is configured to execute normal control for adjusting the temperature inside the vehicle according to the set temperature set by the occupant, or to execute drying control for blowing the introduced outside air onto the front window 2 to dry the water absorption film 4. The air conditioning system 100 includes a controller 10, a plurality of sensors 21 to 23, and an air conditioner 30.

[0021] Specifically, the plurality of sensors include an outside air temperature and humidity sensor 21 that measures the temperature and humidity of the air outside the vehicle (outside air), an inside air temperature and humidity sensor 22 that measures the temperature and humidity of the air inside the vehicle (inside air), and a water absorption rate sensor 23 that measures the water absorption rate of the water absorption film 4 of the front window 2. The air conditioner 30 includes a blower 35, an inside / outside air ratio adjustment valve 36, an air outlet switching valve 37, a compressor 38, a heater 39, and an input unit 40.

[0022] The controller 10 executes various calculations based on the signals received from the plurality of sensors 21 to 23 and the air conditioner 30, and transmits a control signal to the air conditioner 30 to appropriately operate the blower 35, the inside / outside air ratio adjustment valve 36, the air outlet switching valve 37, the compressor 38, and the heater 39. The controller 10 is composed of a computer including one or more processors 10a (typically a CPU), a memory 10b (such as ROM and RAM) that stores various programs and data, and an input / output device.

[0023] The outside air temperature and humidity sensor 21 and the inside air temperature and humidity sensor 22 each include a temperature sensor and a humidity sensor, and measure the ambient temperature and humidity.

[0024] The water absorption rate sensor 23 measures the water absorption rate of the water absorption film 4. The water absorption rate is a value representing the ratio of the current water absorption amount to the saturated water absorption amount of the water absorption film 4, and takes a value from 0% to 100%. That is, when the water absorption rate is 0%, the water absorption amount of the water absorption film 4 is 0, and when the water absorption rate is 100%, the water absorption amount of the water absorption film 4 is equal to the saturated water absorption amount. The water absorption rate sensor 23 includes, for example, a capacitor formed by attaching two electrodes to the water absorption film 4 so that a part of the water absorption film 4 functions as a dielectric. The capacitance of this capacitor changes according to the amount of moisture absorbed in the water absorption film 4. Therefore, by previously grasping the relationship between the capacitance value of the capacitor and the water absorption rate, the water absorption rate can be measured based on the capacitance value obtained from the capacitor.

[0025] The air conditioner 30 includes an outside air inlet 31 for introducing air from outside the vehicle compartment, an inside air circulation port 32 for taking in the air inside the vehicle compartment to circulate the air inside the vehicle compartment, an indoor side air outlet 33 for blowing out the air taken into the air conditioner 30 into the vehicle compartment, and a window side air outlet 34 for blowing out the air taken into the air conditioner 30 toward the front window 2. Inside the air conditioner 30, a blower 35 is provided for drawing in air from the outside air inlet 31 and the inside air circulation port 32 and blowing it out from the indoor side air outlet 33 and the window side air outlet 34.

[0026] The outside air inlet 31 and the inside air circulation port 32 are each provided with an inside / outside air ratio adjustment valve 36. When the inside / outside air ratio adjustment valve 36 of the outside air inlet 31 opens during the operation of the blower 35, air is introduced from outside the vehicle compartment, and when the inside / outside air ratio adjustment valve 36 of the inside air circulation port 32 opens, the air inside the vehicle compartment is circulated. Also, by adjusting the opening degree of each inside / outside air ratio adjustment valve 36 of the outside air inlet 31 and the inside air circulation port 32, the ratio of outside air to inside air in the air blown out from the air conditioner 30 can be adjusted.

[0027] Also, the indoor side air outlet 33 and the window side air outlet 34 are each provided with an air outlet switching valve 37. When the air outlet switching valve 37 of the indoor side air outlet 33 opens during the operation of the blower 35, air is blown out from the indoor side air outlet 33 into the vehicle compartment, and when the air outlet switching valve 37 of the window side air outlet 34 opens, air is blown out from the window side air outlet 34 toward the front window 2.

[0028] Furthermore, the air conditioner 30 includes a compressor 38 for compressing the refrigerant used for cooling or heating the air taken into the air conditioner 30 and sending it to the heat exchanger, and a heater 39 for heating the air taken into the air conditioner 30. Also, the air conditioner 30 includes an input unit 40 for receiving setting inputs of temperature and air volume. The controller 10 transmits control signals for operating the blower 35, the inside / outside air ratio adjustment valve 36, the air outlet switching valve 37, the compressor 38, and the heater 39 of the air conditioner 30 when performing normal control for adjusting the temperature inside the vehicle compartment or when performing drying control for drying the water absorption film 4.

[0029] [Air conditioning control process] Next, with reference to FIGS. 3 to 5, the flow of the air conditioning control process by the air conditioning system 100 of the vehicle 1 according to the present embodiment will be described. FIG. 3 is a flowchart of the air conditioning control process, FIG. 4 is a drying / normal control setting table referred to in the air conditioning control process, and FIG. 5 is a map showing the relationship between the relative humidity of the air near the front window 2 and the target water absorption rate of the water absorption film 4. The air conditioning control process is repeatedly executed by the controller 10 in parallel at a predetermined cycle (for example, every 0.05 to 0.2 seconds).

[0030] The air conditioning control process in FIG. 3 is a process for executing drying control for drying the water absorption film 4 under predetermined conditions. When the air conditioning control process is started, the controller 10 acquires signals from the outside air temperature and humidity sensor 21, the inside air temperature and humidity sensor 22, and the water absorption rate sensor 23 (step S11). Also, the controller 10 acquires the current set temperature from the air conditioner 30 (step 12). Acquisition of signals from the outside air temperature and humidity sensor 21, the inside air temperature and humidity sensor 22, and the water absorption rate sensor 23, and acquisition of the set temperature are always executed in the background in the processes after step S12. The set temperature corresponds to the "target temperature in the vehicle interior" in the present invention. Instead of acquiring the set temperature, the temperature of the air currently blown out from the indoor side air outlet 33 may be acquired.

[0031] Next, when the controller 10 executes normal control with internal air circulation without introducing outside air, the controller 10 calculates the required heating output Qreq required to achieve the set temperature (step S13). For example, the controller 10 calculates, based on the temperature difference between the set temperature and the inside air temperature measured by the inside air temperature and humidity sensor 22 and the air volume of the blower 35, the calorific value of the heater 39 required to reach the set temperature for the inside air temperature within a predetermined time as the required heating output Qreq. Alternatively, the calorific value of the heater 39 at the current time may be acquired as the required heating output Qreq.

[0032] Next, the controller 10 refers to a drying / normal control setting table stored in advance in the memory, and acquires a control setting corresponding to the current water absorption rate WA based on the signal obtained from the water absorption rate sensor 23 and the required heating output Qreq (step S14). As illustrated in FIG. 4, according to the drying / normal control setting table, either drying control or normal control is set according to the combination of the water absorption rate WA and the required heating output Qreq. For example, when the water absorption rate WA is less than 60%, since the water absorption rate WA is sufficiently low and there is no need to perform drying control, normal control is set regardless of the required heating output Qreq. Also, when the required heating output Qreq is 90% or more, there is no margin in the heating output, and it is difficult to prevent a temperature drop when outside air is introduced by performing drying control. Therefore, normal control is set regardless of the water absorption rate WA. That is, drying control is executed at least when the required heating output Qreq is less than 90%.

[0033] Next, the controller 10 determines whether the control setting acquired in step S14 is drying control (step S15). As a result, when the control setting is not drying control (step S15: NO), that is, when the control setting is normal control, the controller 10 ends the air conditioning control process without executing drying control. In this case, if normal control is already being executed, the controller 10 continues normal control.

[0034] On the other hand, when the control setting is drying control (step S15: YES), the controller 10 calculates the ratio of outside air (outside air rate) Xf in the air blown toward the front window 2 that can achieve the set temperature when the heating output of the air conditioner 30 is maximized (step S16).

[0035] Specifically, the controller 10 calculates the temperature (suction temperature) Tmix of the air (mixed air of outside air and inside air) taken into the air conditioner 30 when the set temperature is achieved by maximizing the heating output. The suction temperature Tmix is calculated by the following formula. Tmix = Tout - Qmax / WC Here, Tout is the temperature of the air blown out from the air outlet of the air conditioner 30 (the blown-out temperature), which is determined according to the set temperature (it may be the same as the set temperature). Also, Qmax is the maximum heating output [W], W is the air volume of the blower 35 [m 3 / s], and C is the specific heat capacity of air [J / m 3 ℃].

[0036] Furthermore, the controller 10 calculates the outside air rate Xf from the following formula based on the suction temperature Tmix, the outside air temperature Tamb based on the signal acquired from the outside air temperature and humidity sensor 21, and the inside air temperature Tin based on the signal acquired from the inside air temperature and humidity sensor 22. Xf = (Tin - Tmix) / (Tin - Tamb)

[0037] Next, the controller 10 calculates the relative humidity RHw of the air blown out from the window side air outlet 34 toward the front window 2 (i.e., the air near the front window 2) when the heating output is maximum and the outside air rate is Xf (step S17). This relative humidity RHw corresponds to the "humidity of the air near the surface on the passenger compartment side of the vehicle window glass" in the present invention. Also, in the present embodiment, the "near the front window 2" refers to the range where air is blown out from the window side air outlet 34 toward the front window 2.

[0038] Specifically, the controller 10 calculates the absolute humidity AHw of the air near the front window 2 from the following formula based on the absolute humidity AHamb of the outside air based on the signal acquired from the outside air temperature and humidity sensor 21, the absolute humidity AHin of the inside air based on the signal acquired from the inside air temperature and humidity sensor 22, and the outside air rate Xf. AHw = AHamb × Xf + AHin × (1 - Xf)

[0039] Furthermore, the controller 10 calculates the relative humidity RHw of the air near the front window 2 from the absolute humidity AHw of the air near the front window 2 and the dew condensation humidity AHdp as follows. RHw = AHw / AHdp The dew condensation humidity AHdp is the absolute humidity when dew condensation occurs. A dew condensation humidity map defining the relationship between temperature and dew condensation humidity AHdp is stored in advance in the memory, and the controller 10 can refer to the dew condensation humidity map and obtain the dew condensation humidity corresponding to the blowing temperature Tout as the dew condensation humidity AHdp in the above formula.

[0040] Next, the controller 10 determines whether the relative humidity RHw of the air near the front window 2 is less than a predetermined threshold RHth (step S18). The threshold RHth is the upper limit value of the relative humidity at which the water absorption film 4 can be dried without taking a long time, for example, 60%, but it may be changed as appropriate.

[0041] As a result, when the relative humidity RHw of the air near the front window 2 is not less than the predetermined threshold RHth (step S18: NO), that is, when the relative humidity RHw of the air near the front window 2 is equal to or higher than the threshold RHth, it is predicted that even if the drying control is executed, it will take a long time to dry because the humidity of the air blown toward the front window 2 is high. Therefore, the controller 10 ends the air conditioning control process without executing the drying control.

[0042] On the other hand, when the relative humidity RHw of the air near the front window 2 is less than the predetermined threshold RHth (step S18: YES), the controller 10 causes the air conditioner 30 to execute the drying control (step S19). Specifically, the controller 10 maximizes the outputs of the blower 35 and the heater 39, and adjusts the opening degrees of the inside / outside air ratio adjustment valve 36 of the outside air inlet 31 and the inside / outside air ratio adjustment valve 36 of the inside air circulation port 32 so that the outside air ratio becomes Xf. In addition, the controller 10 closes the outlet switching valve 37 of the indoor side outlet 33 and opens the outlet switching valve 37 of the window side outlet 34 so that the air including the outside air is blown toward the front window 2.

[0043] Further, the controller 10 refers to a map that defines the relationship between the relative humidity of the air near the front window 2 stored in advance in the memory and the target water absorption rate of the water absorption film 4, and sets the target water absorption rate corresponding to the relative humidity RHw of the air near the front window 2 calculated in step S17 (step S20). FIG. 5 is an example of a map that defines the relationship between the relative humidity RHw of the air near the front window 2 and the target water absorption rate of the water absorption film 4. As shown in FIG. 5, the target water absorption rate is set so that when the relative humidity RHw of the air near the front window 2 is relatively high, the target water absorption rate is higher than when the relative humidity RHw is relatively low. In this way, when the relative humidity RHw of the air near the front window 2 is relatively high, by setting the target water absorption rate high, it is possible to prevent the time until the end of the drying control from becoming long.

[0044] Next, based on the signal acquired from the water absorption rate sensor 23, the controller 10 determines whether the current water absorption rate of the water absorption film 4 is less than or equal to the target water absorption rate (step S21). As a result, when the water absorption rate is not less than or equal to the target water absorption rate (step S21: NO), that is, when the drying of the water absorption film 4 is not sufficient, the determination in step S21 is performed again. Thereafter, the determination in step S21 is repeated until the water absorption rate becomes less than or equal to the target water absorption rate.

[0045] When the current water absorption rate of the water absorption film 4 becomes less than or equal to the target water absorption rate (step S21: YES), the controller 10 terminates the drying control by the air conditioner 30 (step S22) and ends the air conditioning control process.

[0046] [Operation and Effect] Next, the operation and effect of the air conditioning system 100 of the vehicle 1 according to the above-described embodiment will be described.

[0047] When the humidity of the air near the surface on the passenger compartment side of the front window 2 is relatively high, the controller 10 sets the target water absorption rate so that it is higher than when the humidity of the air near the surface on the passenger compartment side of the front window 2 is relatively low, and causes the air conditioner 30 to perform drying control until the water absorption rate of the water absorption film 4 becomes equal to or lower than the target water absorption rate. That is, when it is predicted that the execution time of the drying control will be long because the humidity of the air near the surface on the passenger compartment side of the front window 2 is high, by setting a high target water absorption rate for ending the drying control, it is possible to prevent the time until the end of the drying control from becoming long. Thereby, while preventing the front window 2 from fogging due to the drying control, it is possible to shorten the time for introducing outside air.

[0048] In addition, since the target water absorption rate is set based on the relative humidity of the air near the surface on the passenger compartment side of the front window 2, the target water absorption rate can be set by appropriately reflecting the drying ability of the air blown toward the front window 2, and it is possible to surely achieve both prevention of fogging of the front window 2 by the drying control and shortening of the time for introducing outside air.

[0049] In addition, the controller 10 obtains an outside air rate at which the set temperature can be achieved when the heating output of the air conditioner 30 is maximized based on the temperature of the outside air, the temperature of the inside air, and the set temperature, and based on the obtained outside air rate, the humidity of the outside air, and the humidity of the inside air, obtains the humidity of the air near the surface on the passenger compartment side of the front window 2, and when the humidity of the air near the surface on the passenger compartment side of the front window 2 is less than a predetermined threshold value, causes the air conditioner 30 to perform drying control, so that the drying control can be executed when dry outside air can be taken in without exceeding the maximum heating output of the air conditioner 30. Thereby, while avoiding a decrease in the temperature inside the passenger compartment, it is possible to prevent the front window 2 from fogging.

[0050] Further, when the required heating output is less than a predetermined threshold value, the controller 10 causes the air conditioner 30 to execute drying control. Therefore, when there is room in the heating capacity of the air conditioner 30 and it is possible to prevent a temperature drop in the vehicle interior even if outside air is introduced by performing drying control, the drying control can be executed. Thereby, while avoiding a temperature drop in the vehicle interior, it is possible to prevent fogging of the front window 2.

Explanation of Signs

[0051] 1 Vehicle 2 Front Window 4 Water Absorbing Film 10 Controller 21 Outside Air Temperature and Humidity Sensor 22 Inside Air Temperature and Humidity Sensor 23 Water Absorption Rate Sensor 30 Air Conditioner 31 Outside Air Inlet 32 Inside Air Circulation Port 33 Indoor Side Air Outlet 34 Window Side Air Outlet 35 Blower 36 Inside / Outside Air Ratio Adjusting Valve 37 Air Outlet Switching Valve 38 Compressor 39 Heater 40 Input Unit 100 Air Conditioning System

Claims

1. An air conditioning system for a vehicle, comprising: an air conditioner capable of blowing out air introduced from outside the vehicle compartment and air taken in from inside the vehicle compartment toward the surface on the vehicle compartment side of the vehicle window glass; a water absorption rate sensor for measuring the water absorption rate of a water absorption film provided on the surface on the vehicle compartment side of the vehicle window glass; an outside air humidity sensor for measuring the humidity of the air outside the vehicle compartment; an inside air humidity sensor for measuring the humidity of the air inside the vehicle compartment; a controller configured to control the air conditioner, wherein the controller: acquires the humidity of the air near the surface on the vehicle compartment side of the vehicle window glass based on the humidity of the air outside the vehicle compartment measured by the outside air humidity sensor and the humidity of the air inside the vehicle compartment measured by the inside air humidity sensor; when the humidity of the air near the surface on the vehicle compartment side of the vehicle window glass is relatively high, sets the target water absorption rate to be higher compared to when the humidity of the air near the surface on the vehicle compartment side of the vehicle window glass is relatively low; is configured to cause the air conditioner to perform a drying control of blowing out air containing air introduced from outside the vehicle compartment toward the surface on the vehicle compartment side of the vehicle window glass until the water absorption rate of the water absorption film measured by the water absorption rate sensor becomes equal to or lower than the target water absorption rate. An air conditioning system for a vehicle.

2. The air conditioning system for a vehicle according to claim 1, wherein the humidity of the air near the surface on the vehicle compartment side of the vehicle window glass is relative humidity.

3. an outside air temperature sensor for measuring the temperature of the air outside the vehicle compartment; an inside air temperature sensor for measuring the temperature of the air inside the vehicle compartment; wherein the controller: acquires the target temperature inside the vehicle compartment; acquires the ratio of the air outside the vehicle compartment in the air blown out toward the surface on the vehicle compartment side of the vehicle window glass that can achieve the target temperature when the heating output of the air conditioner is maximized based on the temperature of the air outside the vehicle compartment measured by the outside air temperature sensor, the temperature of the air inside the vehicle compartment measured by the inside air temperature sensor, and the target temperature; acquires the humidity of the air near the surface on the vehicle compartment side of the vehicle window glass based on the acquired ratio of the air outside the vehicle compartment, the humidity of the air outside the vehicle compartment, and the humidity of the air inside the vehicle compartment; is configured to cause the air conditioner to perform the drying control when the humidity of the air near the surface on the vehicle compartment side of the vehicle window glass is less than a predetermined threshold. The air conditioning system for a vehicle according to claim 1 or 2.

4. wherein the controller: acquires the target temperature inside the vehicle compartment, When the air conditioner circulates the air inside the vehicle without introducing the air outside the vehicle compartment, obtain the required heating output necessary to achieve the target temperature. When the required heating output is less than a predetermined threshold value, the drying control is configured to be executed by the air conditioner. The vehicle air conditioning system according to claim 1 or 2.

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