JPH06156194A - Vehicle air conditioner - Google Patents

Abstract

PURPOSE:To minimize the total power consumption in preventing the cloudiness of window glass by using a transparent conductive thin films while executing the air-conditioning in a cabin. CONSTITUTION:A ROM built in a control device 50 stores the power consumption of a HWS 31 for the outdoor air introducing volume for each vehicle speed. The control device 50 controls an indoor/outdoor air switching damper 7 according to the vehicle speed to be detected by a vehicle speed sensor 49 so that the total of the power consumption of a refrigerant compressor and the power consumption of the HWS 31 may be minimized, and at the same time, the power supply to the HWS 31 is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular air conditioner capable of preventing fogging of a window glass by energizing a transparent conductive thin film provided on the window glass to heat the window glass.

[0002]

2. Description of the Related Art Conventionally, in a diesel engine vehicle or an electric vehicle, etc. where a heat source for heating is not sufficiently secured, the amount of introduced outside air is reduced (the amount of circulation of inside air is increased) during heating.
A technique for improving heating performance by reducing ventilation loss is known. However, in this case, there is a problem that the window glass becomes cloudy due to an increase in the humidity in the vehicle compartment as the amount of circulation of the inside air increases. Then, the actual development Sho 61-5
Japanese Patent No. 8112 discloses a technique of providing a transparent conductive thin film on a window glass and heating the window glass by energizing the transparent conductive thin film to prevent the window glass from fogging.

[0003]

However, in the prior art disclosed in the above publication, the power consumption of the air conditioner saved by performing the heating by circulating the inside air exceeds the power consumption of the air conditioner, and the transparency necessary for the anti-fog of the window glass is increased. The power supplied to the conductive thin film may be higher. As a result, there arises a problem that the total power consumption of the vehicle is rather increased. Therefore, as a result of an experiment conducted by the inventor of the present application, when performing anti-fog on the window glass by air conditioning in the vehicle compartment and energizing the transparent conductive thin film by the air conditioner, the amount of outside air introduced should be increased as the vehicle speed increases. Therefore, it was found that the total power consumption of the air conditioner and electric power supplied to the transparent conductive thin film can be reduced.

The details will be described below. When the complete outside air mode or the amount of introduced outside air is high, it is possible to prevent fogging of the window glass only by ventilating the outside air. The required power supply can be reduced. Further, since the power consumption in the heating means of the air conditioner is proportional to the temperature difference before and after the heating means, if the blown air temperature after the heating means is the same, the lower the intake air temperature before the heating means is in the heating means. Power consumption will increase.
Therefore, when the outside air mode or the ratio of the amount of introduced outside air is large, the intake air temperature becomes lower in the winter when the window glass tends to become cloudy compared to when in the inside air mode. Will consume more power.

On the other hand, in the complete inside air mode or when the ratio of the amount of introduced inside air is high, the temperature of the sucked air can be raised by introducing warm inside air, so that the power consumption in the heating means of the air conditioner is reduced. be able to. However, since the ventilation volume (outside air volume) is small, the humidity in the passenger compartment rises and the window glass easily becomes fogged. Therefore, the power supply required to energize the transparent conductive thin film to protect the window glass is increased. Need to let. As a result, the total of the power consumption of the air conditioner and the power supply required to energize the transparent conductive thin film to defrost the window glass is minimized in the complete inside air mode or the complete outside air mode. It can be seen that the internal / external air mixing ratio is not a predetermined time but a predetermined ratio. Furthermore, when the relationship between the vehicle speed and the surface temperature of the window glass is examined, it is known that the higher the vehicle speed, the lower the surface temperature of the window glass. Taking these things into consideration, as a result of experiments conducted by the inventors of the present application, the power consumption of the air conditioner is changed by changing the predetermined ratio of the inside / outside air mixing ratio so that the outside air introduction amount increases as the vehicle speed increases. It was specifically confirmed that the total of the power supplied to the transparent conductive thin film can be minimized. The present invention has been made based on the above circumstances, and an object thereof is to minimize the total power consumption in the case of preventing fogging of a window glass by using a transparent conductive thin film while air-conditioning a vehicle interior. It is to provide a vehicle air conditioner capable of performing the above.

[0006]

In order to achieve the above object, the present invention provides a duct for connecting an inside air inlet and an outside air inlet with a vehicle compartment, and introducing the inside air or the outside air into the duct to provide the vehicle. An air blower to be sent indoors, an inside / outside air switching means for adjusting the introduction ratio of the inside air and the outside air introduced into the duct, a heating means for heating the air in the duct, and a window glass, which are energized. A transparent conductive thin film that heats the window glass, a vehicle speed detection unit that detects the vehicle speed, and based on the vehicle speed and the amount of outside air introduced, the transparent conductive thin film is heated to prevent fogging of the window glass. The minimum supply power required to determine the minimum supply power and the power consumption of the heating means that changes in accordance with the amount of outside air introduced are minimized, depending on the vehicle speed detected by the vehicle speed detection means. The above Further comprising a control means for controlling the supply power of the working and the to the transparent conductive thin film of the outside air switching means and technical means.

[0007]

The air conditioner for a vehicle of the present invention having the above-described structure has the following actions. The minimum power supply to the transparent conductive thin film required to prevent the fogging of the window glass varies depending on the vehicle speed and the amount of outside air introduced. Further, the power consumption of the heating means required to heat the air in the duct changes according to the amount of outside air introduced. Therefore, based on the vehicle speed and the amount of outside air introduced, the minimum supply power to the transparent conductive thin film necessary to prevent the fogging of the window glass is obtained, and the heating means that changes according to this minimum supply power and the amount of outside air is supplied. The operation of the inside / outside air switching unit and the electric power supplied to the transparent conductive thin film are controlled according to the vehicle speed so that the sum of the power consumption and the power consumption is minimized.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a vehicle air conditioner of the present invention will be described with reference to FIGS. FIG. 1 is an overall schematic view of a vehicle air conditioner. The vehicle air conditioner 1 of the present embodiment is installed in, for example, an electric vehicle,
A duct 2 for introducing air into the vehicle compartment is provided. A first blower 3 and a second blower 4 are provided at one end of the duct 2 for sending air into the passenger compartment. The first blower 3 includes an inside air introduction port 5 for introducing inside air, an outside air introduction port 6 for introducing outside air, and an inside / outside air switching damper 7 for switching between the inside air introduction port 5 and the outside air introduction port 6. The second blower 4 always sucks only the inside air, and includes the inside air introduction port 8 for introducing the inside air.

The other end of the duct 2 is connected to each branch duct 2a,
Via 2b, 2c, and 2d, it is connected to the air outlet opening to each part in the vehicle interior. This air outlet is from the center of the front of the passenger compartment to the center face outlet 9 that mainly blows out cool air toward the upper half of the passenger, and from both sides of the front of the passenger compartment toward the upper half of the passenger or the side window glass. Side face outlet 10 that blows out mainly cold air, front window glass 1
Defroster outlet 12 that mainly blows warm air toward 1.
Foot outlet 1 that mainly blows warm air toward the feet of passengers
It consists of three. Inside the duct 2, the side face outlet 1
At the openings of the respective branch ducts 2a, 2c, 2d leading to the outlets 9, 12, 13 other than 0, the respective branch ducts 2a, 2
Center face damper 1 for opening and closing c and 2d respectively
4, a defroster damper 15, and a foot damper 16 are provided.

A cooling means 17 for cooling the air flowing in the duct 2 is arranged upstream of the duct 2.
A heating means 18 for heating the air flowing in the duct 2 is arranged downstream thereof. A cooling bypass passage 19 that bypasses the cooling means 17 is provided in the duct 2, and a heating bypass passage 20 that bypasses the heating means 18 is provided.
Equipped with. As a result, the cooling means 17 is provided in the duct 2.
The first flow path 21 passing through only the second flow path 22 passing through both the cooling means 17 and the heating means 18, and the heating means 1.
It becomes possible to form the third flow path 23 that passes through only 8. A cooling damper 24 that opens and closes the heating bypass passage 20 is provided. By closing the heating bypass passage 20 with the cooling damper 24, the cooling means 17 is provided.
All the air that has passed through passes through the heating means 18.

A first partition wall 25 is provided upstream of the cooling means 17 in the duct 2 to separate the air blown by the first blower 3 and the air blown by the second blower 4 so as to pass through the cooling means 17. ing. Further, downstream of the cooling means 17 in the duct 2 is provided a second partition wall 26 for separating the air passing through the cooling means 17 and the air bypassing the cooling means 17 and passing only through the heating means 18. . The heating means 18 is arranged in the duct 2 while penetrating the second partition wall 26. Downstream of the second partition wall 26, there are provided an opening 27 for guiding the air passing through only the heating means 18 to the defroster outlet 12 in the defroster mode, and a defroster mode damper 28 for opening and closing the opening 27. There is. The defroster mode damper 28 is provided with the opening 2 when the defroster mode is selected by the user.
It is provided to open 7.

On the inner surface of the window glass 11 (between two sheets of glass in the case of laminated glass), a pair of electrodes 29 provided on both sides of the window glass 11 and connected to the electrodes 29, The transparent conductive thin film 30 is provided over the entire surface of the window glass 11. This transparent conductive thin film 30
Is to generate heat by being energized via the electrode 29, and to prevent the fogging of the window glass 11 by heating the window glass 11. The window glass 11 having the transparent conductive thin film 30 will be referred to as HWS31 hereinafter.

The cooling means 17 of this embodiment is the refrigerant evaporator 17 of the refrigeration cycle 32, and the heating means 18 of this embodiment is
It is the refrigerant condenser 18 of the refrigeration cycle 32. Here, an example of the refrigeration cycle 32 will be described with reference to FIG. FIG. 2 is a refrigerant circuit diagram of the refrigeration cycle 32. Refrigeration cycle 32
In addition to the refrigerant evaporator 17 and the refrigerant condenser 18, is provided with an outdoor heat exchanger 33, a refrigerant compressor 34, a pressure reducing device 35, an accumulator 36, and flow path switching means (described later) for switching the flow direction of the refrigerant. . In addition, this refrigeration cycle 3
The power consumption when operating 2 is about 1000-1500 watts. The outdoor heat exchanger 33 is provided outside the duct 2.
The outdoor fan 37 is used to exchange heat between the outside air and the refrigerant.
And an outside air shutter 38. The refrigerant compressor 34 is
Intakes, compresses, and discharges refrigerant, and the electric motor 3
Driven by 9. The refrigerant compressor 34 is arranged in the sealed case 40 integrally with the electric motor 39.
The electric motor 39 that drives the refrigerant compressor 34 has a rotational speed that is variable under the control of the inverter 41.
The change in the rotation speed of the electric motor 39 changes the refrigerant discharge capacity of the refrigerant compressor 34. The vehicle air conditioner 1 of the present embodiment controls the blown air temperature by changing the capacity of the refrigerant compressor 34 due to the change in the rotation speed. The decompression device 35 decompresses and expands the refrigerant flowing into the refrigerant evaporator 17, and is provided so as to adjust the supercool amount of the refrigerant condenser 18 during dehumidification operation, for example. The flow path switching means switches the flow direction of the refrigerant between the refrigerant operation, the heating operation, and the dehumidifying operation. Specifically, the four-way valve 42 that switches the discharge direction of the refrigerant compressor 34, the refrigerant evaporator 17 during the heating operation. An electromagnetic on-off valve 43 for bypassing the refrigerant, an electromagnetic three-way valve 44 for bypassing the refrigerant condenser 18 during the cooling operation, and a check valve 45 for restricting the flow direction of the refrigerant.

The flow path switching means switches the flow of the refrigerant as follows in accordance with the cooling operation, the heating operation, and the dehumidifying operation. During the cooling operation, the refrigerant discharged from the refrigerant compressor 34 bypasses the four-way valve 42-> the outdoor heat exchanger 33-> the refrigerant condenser 18 and the decompression device 35-> the refrigerant evaporator 1
7 → four-way valve 42 → accumulator 36 → refrigerant compressor 34
The flow is switched in this order (the flow of the refrigerant is indicated by arrow C in the figure). During the heating operation, the refrigerant discharged from the refrigerant compressor 34 is the four-way valve 42 → the refrigerant condenser 18 → the pressure reducing device 3
5-> Bypassing the refrigerant evaporator 17, the outdoor heat exchanger 33
(Outdoor fan 37 ON, outside air shutter 38 open) → Four-way valve 4
The flow is switched in the order of 2 → accumulator 36 → refrigerant compressor 34 (refrigerant flow is indicated by arrow H in the figure).
During the dehumidifying operation, the refrigerant discharged from the refrigerant compressor 34 is
Four-way valve 42 → refrigerant condenser 18 → pressure reducing device 35 → refrigerant evaporator 17 → outdoor heat exchanger 33 (outdoor fan 37 OFF, outside air shutter 38 closed) → four-way valve 42 → accumulator 36 →
The refrigerant compressor 34 is switched so as to flow in order (the refrigerant flow is indicated by an arrow D in the figure).

The above-mentioned first blower 3, second blower 4, inverter 41 of electric motor 39, outdoor fan 37, four-way valve 42, electromagnetic on-off valve 43, electromagnetic three-way valve 44, HWS31,
Each damper 7, 14 to 16, 24, 28 and the outside air shutter 3
An electric component such as an actuator (not shown) that drives 8 is detected by an operation signal from an operation panel (not shown) and each sensor (inside air sensor 46, outside air sensor 47, solar radiation sensor 48, vehicle speed sensor 49, etc.). Energization is controlled by the control device 50 based on the signal (see FIG. 3).
The control device 50 operates by the power supplied from the battery 60. On the operation panel, the temperature setting means 51 for setting the passenger compartment temperature desired by the occupant, and the controller 50 are instructed to automatically control the electric parts so that the passenger compartment is maintained at the temperature set by the temperature setting means 51. An automatic air conditioner switch 52 is provided.

The controller 50 includes a ROM 50a and a RAM 5
0b and a CPU 50c. The ROM 50a is a read-only memory, and stores various arithmetic expressions, various data, a predetermined control program, and the like. The RAM 50b is a memory in which data can be freely read and written, and is used to temporarily hold data that appears during processing. CPU
Reference numeral 50c is a central processing unit that performs various calculations and processings based on the control program stored in the ROM 50a.

Now, the operation of the control device 50 when the automatic air conditioner switch 52 is operated will be described with reference to the flow chart shown in FIG. First, the temperature setting means 5
1, inside air sensor 46, outside air sensor 47, solar radiation sensor 4
8. The set temperature Tset, the inside air temperature Tr, the outside air temperature Tam, the amount of solar radiation Ts, and the vehicle speed Tv are input from the vehicle speed sensor 49 (step S1). Next, the target outlet temperature TAO is calculated based on the following equation (step S2).

## EQU1 ## TAO = Kset.Tset-Kr.Tr-Kam.Tam-Ks.Ts + C where Kset is a temperature setting constant, Kr is an inside air temperature constant, K
am: outside air temperature constant, Ks: solar radiation constant, C: correction constant.

Next, based on the calculated target outlet temperature TAO, from the blower control characteristics showing the relationship between the target outlet temperature TAO shown in FIG. 5 and each air flow level of the first blower 3 and the second blower 4, The air volume levels of the first blower 3 and the second blower 4 are set (step S3). Then, based on the calculated target outlet temperature TAO, the target outlet temperature T shown in FIG.
Based on the inside / outside air control characteristic indicating the relationship between the AO and the inside / outside air mode, it is determined whether the air sucked by the first blower 3 is inside air or outside air (step S4). Then, based on the calculated target outlet temperature TAO, the outlet mode is determined from the outlet mode control characteristics showing the relationship between the target outlet temperature TAO and the outlet mode shown in FIG. 7 (step S5).

Then, the operation of the HWS 31 is determined according to the calculated target outlet temperature TAO (step S
6). Then, depending on the blowing mode, the cool damper 24
And the open / closed state of the defroster mode damper 28 is determined (step S7). Then, according to the calculated target outlet temperature TAO, the operating state of the refrigeration cycle 32 is determined from the target outlet temperature TAO shown in FIG. 8 and the compressor control characteristic indicating the on / off state of the refrigerant compressor 34. That is,
The rotation speed of the refrigerant compressor 34 (including the rotation speed 0) and the operation mode (cooling operation, heating operation, dehumidifying operation) are determined (step S8). Then, a power saving determination is performed (step S9). This power saving determination will be described later.

After that, the following controls are sequentially performed. The energizing voltage of the first blower 3 and the second blower 4 is controlled according to the determination result of step S3 (step S10). The inside / outside air switching damper 7 is controlled according to the determination result of step S4 or step S9 to switch between the inside and outside air (step S11). According to the determination result of step S5, the center face damper 14, the defroster damper 15, and the foot damper 16 are controlled to set the blowout mode (step S12). The operation of the HWS 31 is controlled according to the determination result of step S6 or step S9 (step S13). The cool damper 24 and the defroster mode damper 28 are controlled according to the determination result of step S7 (step S14). The operation state of the refrigeration cycle 32 is controlled according to the determination result of step S8 (step S15). Then return.

Next, the power saving determination made in step S9 will be described with reference to FIG. FIG. 9 is a flowchart showing a processing procedure of the control device 50 relating to the power saving determination. First, it is determined whether the HWS 31 is in an operating (ON) state (step 91). If not in operation (N
O) advances to step S10 above. When it is in the operating state (YES), from the outside air amount control characteristics shown in FIG.
The inside / outside air switching damper 7 is switched to the outside air introduction amount determined by the vehicle speed (step 92). This outside air introduction amount is controlled so as to increase as the vehicle speed increases, as shown in FIG. As a result, the temperature of the sucked air can be raised by mixing the warm inside air rather than sucking only the cold outside air. Next, the HW determined by the vehicle speed from the power supply control characteristic shown in FIG.
The power supply of S31 is controlled (step 93). This H
As shown in FIG. 11, the power supplied to the WS 31 is controlled to increase as the vehicle speed increases. After performing the process of step 93, the process proceeds to step S10. Note that FIG.
0 and the characteristic charts shown in FIG. 11 are obtained by expressing the relationship between the amount of outside air introduced and the power consumption of the HWS 31 required to prevent the fogging of the window glass 11 with respect to changes in vehicle speed.

External air introduction amount and HW with respect to changes in vehicle speed
The relationship with the power consumption in S31 will be described with reference to FIGS. First, the relationship between the vehicle speed and the surface temperature of the window glass 11 will be described. FIG. 13 shows a model of HWS31. In addition, Tam: outside air temperature, Tr: vehicle interior temperature (inside air temperature) Tgi: surface temperature of the window glass 11 (inside the vehicle interior) α0: heat transfer coefficient (outside the vehicle interior), αi: heat transfer coefficient (inside the vehicle interior) δ: thickness of window glass 11, δ ′: transparent conductive thin film 3
Thickness 0: λ: thermal conductivity of window glass 11, λ ′: transparent conductive thin film 3
The thermal conductivity of 0 is A: the surface area of the window glass 11, and Q: the power supplied to the HWS 31. Surface temperature T of window glass 11
gi can be obtained from the following equation from the heat balance in the window glass 11.

[Equation 2]

Using this equation, the vehicle speed and the glass surface temperature Tgi
As shown in FIG. 14, the relationship between the glass surface temperature Tgi and the glass surface temperature Tgi decreases as the vehicle speed increases. The electric power supplied to the HWS 31 and the vehicle interior temperature are under the same constant conditions. As a result, the higher the vehicle speed, the more easily fog is generated on the window glass 11. Therefore, even under the same air conditioning conditions, in order to prevent fogging of the window glass 11,
It is necessary to increase the power supply to the HWS 31. When the relationship between the amount of outside air introduced and the power consumption (power consumption) is calculated based on the above results, the results shown in FIG. 12 are obtained. In this FIG. 12, the horizontal axis is the amount of outside air introduced and the vertical axis is the power consumption,
Changes in power consumption depending on vehicle speed (0 km / h, 40 km / h, 100 km / h) are shown. In the figure, the power consumption of the refrigerant compressor 34 is indicated by a broken line, the power consumption of the HWS 31 is indicated by a one-dot chain line, and the total power consumption of the refrigerant compressor 34 and the HWS 31 is indicated by a solid line.

The power consumption of the refrigerant compressor 34 shows a characteristic that the temperature difference before and after the heating means 18 becomes large because the intake air temperature lowers as the amount of introduced outside air increases, so that the power consumption also increases. Regarding the power consumption of the HWS 31, the humidity in the vehicle interior decreases as the amount of introduced outside air increases, and the window glass 11
Shows a characteristic that power consumption is reduced because it becomes difficult to cloud.
Therefore, as can be seen from the relationship between the vehicle speed and the glass surface temperature described above, the lower the vehicle speed, the smaller the power consumption can be. As a result, when the total power consumption of the refrigerant compressor 34 and the HWS 31 is calculated, the point indicating the minimum power consumption value for each vehicle speed (indicated by a black dot in the figure) is as shown by the solid line in the figure.
It appears with different amounts of introduced outside air. That is, the lower the vehicle speed, the smaller the amount of outside air introduced. The relationship between the outside air introduction amount and the vehicle speed for achieving this minimum power consumption value is summarized as shown in FIG. Similarly, vehicle speed and H
The relationship with the power supplied to the WS 31 is summarized as shown in FIG. 11 described above. As described above, in the present embodiment, the total power consumption of the vehicle can be suppressed to the minimum value by variably controlling the outside air introduction amount and the power supplied to the HWS 31 according to the vehicle speed as described above.

In the above embodiment, an example in which the present invention is applied to an electric vehicle has been described, but it can also be applied to a gasoline vehicle and a diesel vehicle. In this case, the power consumption of the refrigerant compressor driven by the engine and the power generation amount of the alternator driven by the engine can be minimized, and as a result, the fuel consumption can be improved. In the above-described embodiment, the air conditioner unit having the two-layer structure including the first blower 3 and the second blower 4 and partitioning the respective blowers with the first partition wall 25 is shown, but the inside / outside air switching means is provided by only one blower. The air conditioner unit may have a single-layer structure, which is provided and is not divided into two layers. The rate of introduction of inside / outside air is determined by detecting the outside air humidity or vehicle interior humidity with a humidity sensor,
The set value may be changed according to the detected humidity (see FIG. 15). In this case, when the outside air humidity or the vehicle interior humidity is high, the window glass 11 is easily fogged, and therefore, as shown in FIG.
As shown in, the amount of outside air introduced is changed so as to increase.
On the other hand, when the outside air humidity or the vehicle interior humidity is low, the amount of introduced inside air is varied so as to increase. Although the transparent conductive thin film 30 is provided on the front window glass 11 in the above embodiment, the transparent conductive thin film 30 may be provided on the side glass and the rear glass, not limited to the front.
The operation may be controlled by the same method as in the case of the front window glass 11.

[0026]

The vehicle air conditioner of the present invention can accurately control the amount of outside air introduced and the power supplied to the transparent conductive thin film in order to minimize the power consumption of the entire vehicle in accordance with the vehicle speed. When the present invention is applied to an engine vehicle, fuel consumption can be improved, and when the present invention is applied to an electric vehicle, power consumption of a battery can be reduced.

[Brief description of drawings]

FIG. 1 is an overall schematic diagram of a vehicle air conditioner according to a present embodiment.

FIG. 2 is a refrigerant circuit diagram of a refrigeration cycle.

FIG. 3 is a block diagram of a control device.

FIG. 4 is a flowchart showing a processing procedure of a control device relating to automatic control.

FIG. 5 is a graph showing a blower control characteristic.

FIG. 6 is a graph showing an inside / outside air control characteristic.

FIG. 7 is a graph showing blowing mode control characteristics.

FIG. 8 is a graph showing compressor control characteristics.

FIG. 9 is a flowchart showing a processing procedure of a control device for power saving determination.

FIG. 10 is a graph showing the relationship between vehicle speed and the amount of introduced outside air.

FIG. 11 is a graph showing the relationship between the vehicle speed and the electric power supplied to the HWS.

FIG. 12 is a graph showing a relationship among an amount of introduced outside air, a vehicle speed, and power consumption.

FIG. 13 is a model diagram of HWS.

FIG. 14 is a graph showing the relationship between vehicle speed and glass surface temperature.

FIG. 15 is a graph showing a modified example of the present invention and showing the relationship between humidity and the inside / outside air ratio.

[Explanation of symbols]

 1 Air Conditioner for Vehicle 2 Duct 3 First Blower 4 Second Blower 5 Inside Air Inlet 6 Outside Air Inlet 7 Inside / Outside Air Switching Damper (Inside / Outside Air Switching Means) 8 Inside Air Inlet 11 Window Glass 18 Heating Means 30 Transparent Conductive Thin Film 32 refrigeration cycle 49 vehicle speed sensor (vehicle speed detection means) 50 control device (control means)

Claims (1)

[Claims] 1. A duct for connecting an inside air introduction port and an outside air introduction port to a vehicle interior, b) a blower for introducing inside air or outside air into the duct and sending the air into the vehicle interior, and c) inside the duct. Inside / outside air switching means for adjusting the introduction ratio of inside air and outside air to be introduced into the duct; d) heating means for heating the air in the duct; and e) the window provided by being energized and energized. A transparent conductive thin film for heating the glass; f) a vehicle speed detecting means for detecting the vehicle speed; and g) heating the transparent conductive thin film based on the vehicle speed and the amount of outside air introduced to prevent the window glass from fogging. In order to minimize the total of the minimum supply power required for this, the minimum supply power and the power consumption of the heating means that changes according to the amount of outside air introduced, depending on the vehicle speed detected by the vehicle speed detection means. Operation of the inside / outside air switching means And air conditioning apparatus for a vehicle, characterized in that it comprises a control means for controlling the supply power of the to the transparent conductive thin film.