KR101619873B1 - Air conditioning system for automotive vehicles - Google Patents

Abstract

The present invention relates to a vehicle air conditioner and, more particularly, to an air conditioner for a vehicle which controls the air flow rate of air blown to a windowpane to be lowered even if the temperature of the vehicle interior is raised to reduce a blowing amount of the blower, .
To achieve these objects, an air conditioning apparatus of the present invention includes a blower for supplying air to a passenger compartment, a defrost vent for a window glass, a face vent for a passenger, a floor vent for a floor of a passenger compartment, The air conditioner according to any one of claims 1 to 3, wherein the controller controls the blower to decrease the amount of air supplied to the passenger compartment when the temperature of the passenger compartment rises in a heating mode, And a control unit for controlling the mode doors so that the air amount ratio supplied to the defrost vent is increased if a value obtained by subtracting the detected temperature from the set temperature is less than a predetermined reference temperature.

Description

TECHNICAL FIELD [0001] The present invention relates to an air conditioning system for an automobile,

More particularly, the present invention relates to an air conditioner for a vehicle, and more particularly, it relates to an air conditioner for a vehicle, and more particularly, to an air conditioner for a vehicle which controls the air volume of the air blown to a windowpane, To a vehicle air conditioner capable of preventing a fogging phenomenon of a window glass caused by a window glass.

In recent years, automotive air conditioners have been improved in an automatic control system.

An automatic control system air conditioner (hereinafter referred to as "air conditioner") automatically adjusts the temperature of a vehicle interior according to external conditions and comprises a controller 1 as shown in Fig.

The controller 1 is equipped with a microprocessor. When the outside temperature, the inside temperature, the inside humidity, the solar radiation amount, and the like are input from the various sensors 3, the "Vent Mode" , "Bi-Level Mode", "Floor Mode", "Mix Mode", "Deep Mode" (Def Mode) The temperature controller 12, the heater 14, the intake door 16, the temperature control door 18, and the various mode doors 20, 22 and 24. Therefore, the indoor temperature of the vehicle is automatically adjusted.

The "vent mode" is a mode for discharging the air having passed through the evaporator 12 and the heater 14 toward the driver's face. The "bi-level mode" is a mode in which the evaporator 12 and the heater 14 And the floor mode is a mode in which the air having passed through the evaporator 12 and the heater 14 is discharged to the bottom surface of the vehicle cabin.

The "mix mode" is a mode for discharging the air that has passed through the evaporator 12 and the heater 14 to the bottom surface of the windowpane and the cabin of the vehicle. This is a mode in which air is discharged in the direction of the window glass.

On the other hand, the controller 1 is configured to control the various mode doors 20, 22, 24 to the "floor mode" This is because a warm warm air must be supplied to the driver and passengers at the foot of the vehicle, so that the driver and passengers in the car can feel comfortable.

At this time, even if the air conditioner is controlled in the "floor mode" state, the Def Door 20 and Vent Door 22 must be opened by a predetermined amount.

This is because air can be discharged to the defrost vent 20a and the face vent 22a even if the air conditioner is controlled in the "floor mode " Mode ", air is supplied to the front windowpane and the side windowpane corresponding to the defrost vent 20a and the face vent 22a. As a result, even if the air conditioner is controlled in the" floor mode " This is because it is possible to prevent fogging and icing which may occur in window glass and side window glass in advance.

Generally, in the "floor mode", it is common that the air distribution to the defrost vent 20a, the face vent 22a and the floor vent 24a is made at a ratio of 30: 10: 60.

However, this conventional automatic control type air conditioner has a structure to reduce the air blowing amount of the blower 10 when the temperature of the vehicle interior is raised and becomes higher than the "set temperature " The air volume of the air supplied to the vent 22a is also reduced. Thus, it is pointed out that there is a fear that fogging may occur in the front windowpane and the side windowpane due to such drawbacks.

That is, the conventional air conditioner reduces the air blowing amount of the blower 10 so that the interior of the vehicle is not heated too much when the temperature of the interior of the vehicle rises and becomes higher than the "set temperature"

In this case, however, the amount of air supplied to the defrost vent 20a and the face vent 22a is also reduced, so that the air volume of the air supplied to the front windowpane and the side windowpane is also reduced. It is pointed out that there is a possibility that the fogging phenomenon may occur in the front window glass and the side window glass due to such drawbacks.

Particularly, since the mode doors 20, 22 and 24 are controlled in the "floor mode " so that the amount of air supplied to the defrost vent 20a and the face vent 22a is greatly reduced, There is a disadvantage in that the amount of air supplied to the defrost vent 20a and the face vent 22a is further reduced when the air blowing amount of the front window pane 10 and the side window pane 10 is reduced. There is a problem that it becomes large. Even when the temperature is extremely low, there is a problem that icing (hereinafter referred to as "icing") occurs in the front window pane and the side window pane.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-described problems of the related art, and it is an object of the present invention to provide an air conditioner which controls the air volume of the air supplied to a windowpane to be reduced even if the temperature of the vehicle interior is raised during heating, And an air conditioner for a vehicle.

It is another object of the present invention to provide a vehicular air conditioner capable of preventing fogging of a window glass caused by a decrease in air volume and thus an icing phenomenon by controlling the amount of air supplied to a windowpane to be not reduced even when the temperature of the vehicle interior is raised, .

In order to achieve the above object, a vehicle air conditioning system of the present invention includes a blower for supplying air to a vehicle interior, a defrost vent on a window glass side, a face vent on a passenger side, a floor vent on a floor surface of a vehicle interior, The air conditioner according to any one of claims 1 to 3, wherein the control unit controls the blower to decrease the amount of air supplied to the passenger compartment when the temperature of the passenger compartment rises in a heating mode, And a controller for controlling the mode doors so that the air flow rate supplied to the defrost vent is increased when the value obtained by subtracting the detected indoor temperature from the set temperature is lower than a predetermined reference temperature.

According to the air conditioning system for a vehicle according to the present invention, when the difference between the "set temperature" and the "actual temperature" in the interior of the vehicle is small at the time of heating, more airflow can be distributed in the window glass direction, Even when the rotational speed of the blower is reduced, the air volume of the air supplied to the windowpane is not reduced.

In addition, even if the temperature of the interior of the vehicle rises and the rotation speed of the blower is reduced, the air flow rate of the air supplied to the windowpanes is controlled so as not to be reduced, thereby preventing fogging of the windowpane caused by a decrease in air volume, There is an effect.

1 is a view showing a conventional air conditioner for a vehicle,
2 is a view showing a vehicle air conditioner according to the present invention,
3 (a), 3 (b), and 3 (c) are graphs showing the mode conversion relation of the mode door by temperature,
4 is a flowchart showing a control method of the air conditioner according to the present invention,
5 is a view showing another embodiment of the air conditioner according to the present invention,
6 is a flowchart showing a method of controlling an air conditioning apparatus according to another embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a vehicle air conditioner according to the present invention will be described in detail with reference to the accompanying drawings (the same components as those in the prior art are denoted by the same reference numerals).

2 is a detailed view of a feature of a vehicle air conditioner according to the present invention.

First, a description will be given of a vehicle air conditioning system with reference to FIG. 2, before a characteristic portion of the air conditioning system according to the present invention will be described.

A vehicle air conditioner includes a controller (1) and various sensors (3). The various sensors 3 include an outside air sensor, a humidity sensor, a solar radiation sensor, an inca sensor, etc. These sensors 3 sense the outside air temperature and humidity of the vehicle, the inside air temperature and humidity of the vehicle,

The controller 1 processes the data inputted from each sensor 3 and controls the blower 10, the evaporator 12, the heater 14, the intake door 16, the temperature control door 18 And the various mode doors 20, 22, and 24, respectively.

In particular, the "Vent Mode", "Bi-Level Mode", "Floor Mode", "Mix Mode", " 12, 14, 16, 18, 20, 22, 24, while changing to the respective devices 10, 12, 14, Therefore, the indoor temperature of the vehicle is automatically adjusted.

On the other hand, the controller 1 controls each of the mode doors 20, 22, 24 in the "floor mode" state when the vehicle interior is heated. Thus, a warm warm air is supplied to the driver and the foot of the passenger.

At this time, even if the air conditioner is controlled in the "floor mode" state, the deep door 20 and the vent door 22 are opened by a predetermined amount.

Thus, air is blown through the defrost vent 20a and the face vent 22a to the front window pane and the side window pane. This prevents the fogging and icing of the front window glass and the side window glass in advance.

The controller 1 reduces the rotational speed of the blower 10 and reduces the air volume of the hot air supplied to the passenger compartment when the temperature of the passenger compartment rises higher than the "set temperature"

This is because, when the temperature of the vehicle interior becomes higher than the "set temperature" set by the driver, the vehicle interior may become too hot or uncomfortable. Accordingly, when the temperature of the passenger compartment is higher than the "set temperature ", the air volume of the hot air supplied to the passenger compartment is reduced, thereby maintaining the temperature of the passenger compartment at a comfortable level.

Next, a characteristic portion of the vehicle air conditioner according to the present invention will be described in detail with reference to FIG.

First, the air conditioner of the present invention includes a heating sensing means 30 for sensing whether the interior of the vehicle is currently heated.

The heating sensing means 30 is provided with an opening amount detection sensor 32 for sensing the amount of opening of the temperature control door 18 and a control means for controlling the amount of opening of the temperature control door 18 inputted to the opening amount detection sensor 32 And a determination unit 34 for determining whether the interior of the vehicle is currently heating.

The opening amount detection sensor 32 is a position detection sensor for sensing the opening angle of the temperature control door 18 and detects the opening angle of the temperature control door 18 so that the opening amount of the temperature control door 18 is indirectly .

Particularly, by detecting the opening angle of the temperature control door 18, the opening amount of the temperature control door 18 with respect to the cool air passage 18a and the opening amount of the temperature control door 18 with respect to the warm air passage 18b It serves to detect.

When the amount of opening of the temperature control door 18 is input from the opening amount detection sensor 32, the determination unit 34 determines whether the vehicle interior is currently cooling or heating based on the input opening amount, .

Particularly when the opening amount of the temperature control door 18 with respect to the warming passage 18b is larger than the opening amount of the temperature control door 18 with respect to the cooling passage 18a among the inputted opening amount, And outputs a "heating detection signal ".

The determination unit 34 stores in advance the opening amounts of the cold air passage 18a and the warm air passage 18b according to the opening angle of the temperature control door 18 and stores the opening amounts of the cold air passage 18a The opening amount of the warming passage 18b is compared and judged.

As another example of the heating sensing means 30, there is a temperature control switch (not shown) provided on the front of the driver's seat.

The temperature control switch is a switch for selecting the cooling mode or the heating mode of the air conditioner, and detects that the user selects the heating mode. Therefore, it indirectly detects whether the interior of the car is currently heating.

Referring again to FIG. 2, the air conditioner of the present invention includes a room temperature sensing means 40 for sensing a temperature of a vehicle interior.

The room temperature sensing means 40 is a temperature sensor installed in a vehicle interior, and senses the temperature of the vehicle interior and then inputs the sensed "room temperature data"

It is preferable that the room temperature sensing means 40 is used in common with the existing incase sensor 3 for measuring the temperature of the inside of the car. Accordingly, it is possible to detect the temperature of the passenger compartment without providing a separate temperature sensor. As a result, the number of parts can be reduced and the number of parts can be reduced, so that the cost reduction effect can be expected.

2, the air conditioner of the present invention is provided with an arithmetic unit 50 and a control unit 52 which are built in the controller 1.

The calculation unit 50 subtracts the current "room temperature" input from the room temperature sensing unit 40 at the "set temperature" set by the driver or the like when the "heating sensing signal" is inputted from the heating sensing unit 30.

When the value Dif obtained by subtracting the " room temperature "from the" set temperature " is input, the control unit 52 compares the input value with a predetermined "reference temperature"

As a result of comparison, if the temperature is lower than the "reference temperature ", the rotational speed of the blower 10 may be lowered as the temperature of the inside of the vehicle rises and approaches the set temperature, And controls the position of each mode door 20, 22, 24 in the direction of the window glass in the "floor mode ". As a result, the air flow rate supplied to the de-frost vent 20a is increased.

Therefore, the airflow distribution of the air blown toward the window glass is increased. Thus, even if the rotational speed of the blower 10 is lowered due to the temperature rise of the inside of the vehicle, the air volume of the air blown toward the window glass is not reduced. As a result, it is possible to prevent the fogging of the window glass due to the lowering of the rotation speed of the blower 10 and the resulting icing phenomenon.

3A to 3C, when the value Dif obtained by subtracting the "room temperature" from the "set temperature" is equal to or smaller than the "first reference temperature", the control unit 52 determines that each mode door 20, 22, and 24 are controlled to the "mix mode ".

The "mix mode" is a mode for discharging the air that has passed through the heater 14 to the bottom surface of the windowpane and the cabin, as described above. As shown in the following Table 1, Quot; floor mode "is significantly increased as compared with the" floor mode ".

In the mix mode and the floor mode, mode Floor vent Defrost vents Side vents Floor mode 55% 35 % 10% Mix mode 45% 45% 10%

Therefore, at the time of the "mix mode ", the amount of air blown in the direction of the window glass is increased to effectively prevent the fogging phenomenon occurring in the windowpane and the resulting ice phenomenon.

More preferably, the control unit 52 determines whether or not a value Dif (hereinafter referred to as "Dif value ") obtained by subtracting the room temperature from the" set temperature " 22, and 24 is set to be between the "mix mode" and the "floor mode" when the temperature of the mode door 20 is higher than the first reference temperature It is preferable to control to the corresponding intermediate mode.

Therefore, when the "Dif value" is larger than the "first reference temperature" and equal to or lower than the "second reference temperature", it is possible to control the increase rate of the airflow rate of the distrovent vent 20a to be smaller than that at the " desirable.

The reason for this construction is that when the "Dif value" is larger than the "first reference temperature" and equal to or lower than the "second reference temperature", the degree of temperature rise in the vehicle interior is low and the degree of temperature rise is low This means that it is not necessary to increase the airflow rate of the defrost vent 20a significantly compared with the case where the airflow rate of the defrost vent 20a is lower than the "first reference temperature".

More preferably, when the "Dif value" is larger than the "first reference temperature" and equal to or lower than the "second reference temperature", the control section 52 controls the defrost vent 20a, the face vent 22a, It is preferable that the position of each mode door 20, 22, 24 with respect to each of the doors 24a, 24a is appropriately controlled between the "mix mode" and the "floor mode", and linearly controlled.

Thus, the amount of opening of the defrost vent 20a, the face vent 22a, and the floor vent 24a can be controlled linearly with respect to the "Dif value ". This makes it possible to linearly control the air flow rate ratio of the air blown toward the window glass to the "Dif value ".

When the "Dif value" is larger than the "second reference temperature", the control unit 52 may control the position of each mode door 20, 22, 24 to the "floor mode".

This means that when the "Dif value" is larger than the "second reference temperature ", it means that the temperature in the passenger compartment is not increased, meaning that the temperature of the passenger compartment is not increased. It is not necessary to increase the amount of air blown to the window glass. Therefore, the position of each mode door 20, 22, 24 is controlled in the "floor mode ".

It is preferable that the control section 52 sets the "first reference temperature" and the "second reference temperature" to be lower as the outside air temperature is lower.

This is because the lower the outside temperature is, the larger the probability of occurrence of "fogging and casting" in the window glass is, so that the lower the outside air temperature is, the earlier the time point of increasing the airflow toward the window glass.

Next, an operation example of the present invention having such a configuration will be described with reference to FIGS. 2 and 4. FIG.

First, it is determined whether the vehicle interior is heating (S101). As a result of the determination, if the interior of the vehicle is in the heating state, the arithmetic unit 50 calculates a value Dif obtained by subtracting the "indoor temperature detected" input from the indoor temperature sensing unit 40 at the " (S103).

When the calculation of the "Dif value" is completed, the control unit 52 compares the calculated "Dif value "

As a result of the determination, if the temperature is lower than the "reference temperature ", it is determined that the rotational speed of the blower 10 may be lowered according to the temperature rise in the vehicle interior, thereby reducing the air volume blown to the front window glass and the side window glass And controls each of the mode doors 20, 22, and 24 by the target opening amount. That is, the amount of air toward the defrost vent 20a is increased (S107).

This increases the distribution of the amount of air in the direction of the front window glass and the side window glass so that the air flow rate of the air blown toward the windowpane does not decrease even if the rotational speed of the blower 10 decreases due to the temperature rise in the vehicle interior. As a result, it is possible to prevent the fogging of the window glass due to the lowering of the rotation speed of the blower 10 and the resulting icing phenomenon.

According to the present invention having such a constitution, when the difference between the "set temperature" and the "actual temperature" in the interior of the car becomes small at the time of heating, more airflow can be distributed in the direction of the windowpane, Even if the rotational speed of the blower 10 is reduced due to an increase in the temperature of the room, the air volume of the air supplied to the windowpane is not reduced.

In addition, even if the temperature in the passenger compartment rises and the rotational speed of the blower 10 is reduced, the amount of air supplied to the windowpane is controlled so as not to be reduced so that the fogging of the windowpane due to a decrease in air volume and the resulting icing phenomenon .

Next, Figs. 5 and 6 are views showing another embodiment of the air conditioner according to the present invention.

As shown in FIG. 5, the air conditioner of another embodiment further includes an outside air temperature sensing means 60 for sensing the outside air temperature of the vehicle.

The outside temperature detecting means 60 is constituted by a temperature sensor provided on the outside portion of the vehicle and detects the outside temperature of the vehicle and then inputs the detected outside temperature data to the controller 1. [

It is preferable that the outside air temperature sensing means 60 is used in common with the existing outside air sensor 3 for measuring the outside air temperature. Therefore, it is possible to detect the ambient temperature without providing a separate temperature sensor. As a result, the number of parts can be reduced and the number of parts can be reduced, so that the cost reduction effect can be expected.

Referring again to FIG. 5, the air conditioning apparatus of another embodiment further includes a memory unit 54 and a detection unit 56 which are built in the controller 1.

The memory unit 54 has a built-in "reference temperature" for each temperature.

The detection unit 56 detects in the memory unit 54 the "reference temperature" corresponding to the temperature of the outside air when the outside air temperature is inputted from the outside air temperature detection means 60, .

On the other hand, when the "Dif value" is input in the arithmetic unit 50, the control unit 52 compares whether or not the inputted "Dif value" is smaller than the "reference temperature" input from the detection unit 56. [

As a result of the comparison, if the temperature is lower than the "reference temperature ", it is determined that the rotational speed of the blower 10 may be lowered according to the temperature rise of the inside of the vehicle, thereby decreasing the air volume of the air blown to the front and rear windowpanes The position of each mode door 20, 22, 24 is controlled in the direction of the window glass in the "floor mode ". As a result, the air flow rate supplied to the de-frost vent 20a is increased.

Therefore, the airflow distribution of the air blown toward the window glass is increased. Thus, even if the rotational speed of the blower 10 is lowered due to the temperature rise of the inside of the vehicle, the air volume of the air blown toward the window glass is not reduced. As a result, it is possible to prevent the fogging of the window glass due to the lowering of the rotation speed of the blower 10 and the resulting icing phenomenon.

On the other hand, in the memory unit 54, various "reference temperatures" vary depending on the outside temperature, and the "reference temperatures" for these outside temperatures are based on the test data obtained through several test results.

Preferably, the "reference temperatures" of the memory unit 54 are set to be in inverse proportion to the temperature temperature. For example, it is preferable that the "reference temperature" value stored in the memory section 54 gradually increases as the outside air temperature decreases.

The reason for this construction is that the lower the outside temperature is, the larger the "fogging probability" of the window glass becomes, and the lower the outside temperature is, the larger the "reference temperature" The larger the temperature difference (Dif), the faster is to advance the switching point of "towards window".

The larger the difference between the set temperature and the actual temperature is, the faster the change point of the direction of the windowpane is advanced so that the lower the outside temperature is, the more the airflow distribution of the air blown toward the windowpane becomes. So that it is possible to effectively cope with the "fogging occurrence probability" of the window glass which becomes higher as the outside air temperature is lowered.

In the air conditioning system of another embodiment having the above-described configuration, when the deviation between the "set temperature" and the "actual temperature" in the vehicle interior is small, more airflow distribution can be made in the windowpane direction, Because it is differentiated according to the outside temperature, it can effectively cope with the fogging and icing phenomenon of the window glass which changes according to the outside temperature. Therefore, regardless of the outside temperature, the fogging phenomenon and the icing phenomenon of the window glass can be effectively prevented.

Next, a method of controlling the air conditioner of another embodiment having such a configuration will be described with reference to Figs. 4 and 6. Fig.

First, it is determined whether the vehicle interior is heating (S201). As a result of the determination, if the interior of the vehicle is in the heating state, the arithmetic unit 50 calculates a value Dif obtained by subtracting the "indoor temperature detected" input from the indoor temperature sensing unit 40 at the " (S203).

When the calculation of the "Dif value" is completed, the detection unit 56 detects in the memory unit 54 the "reference temperature" corresponding to the outside temperature of the outside air temperature detection means 60 (S205).

On the other hand, the control unit 52 compares the "Dif value" calculated by the calculation unit 50 with the "reference temperature" detected by the detection unit 56, Quot; reference temperature "(S207).

As a result of the determination, if the temperature is lower than the "reference temperature ", it is determined that the rotational speed of the blower 10 may be lowered according to the temperature rise of the inside of the car, thereby reducing the air volume blown to the front and rear windowpanes And controls each of the mode doors 20, 22, and 24 by the target opening amount. That is, the amount of air to the defrost vent 20a side is increased (S209).

Thus, even if the rotational speed of the blower 10 is lowered due to the temperature rise of the vehicle interior, the air volume of the air blown toward the windowpane is not reduced. As a result, it is possible to prevent the fogging of the window glass due to the lowering of the rotation speed of the blower 10 and the resulting icing phenomenon.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

1: Controller 10: Blower
12: Evaporator 14: Heater
16: Intake door 18: Temperature control door
20: Deep door (Def. Door) 22: Side vent door
24: Floor Door 30: Heating sensing means
32: opening amount detection sensor 34:
40: room temperature sensing means 50:
52: control unit 54: memory unit
56: detecting unit 60: outside temperature detecting means

Claims (6)

A blower 10 for supplying air to the inside of the vehicle, a defrost vent 20a on the side of the window glass, a face vent 22a on the passenger side, a floor vent 24a on the floor surface of the passenger compartment, And a mode door (20, 22, 24) for controlling the air conditioner
In the heating mode, as the temperature of the inside of the car rises, the rotational speed of the blower 10 is controlled to reduce the amount of air supplied to the inside of the car. In addition, a value obtained by subtracting the detected temperature of the car from the set temperature The rate of air supplied to the defrost vent 20a, the face vent 22a and the floor vent 24a is changed to increase the air flow rate to be supplied to the defrost vent 20a, And a control unit (52) for controlling the positions of the mode doors (20, 22, 24) with respect to the frost vent (20a), the face vent (22a) and the floor vent (24a). The method according to claim 1,
The control unit (52)
If the value obtained by subtracting the detected indoor temperature from the set temperature is lower than the first reference temperature, the mode doors 20, 22, and 24 of the vehicle. The method according to claim 1,
The control unit (52)
If the value obtained by subtracting the detected indoor temperature from the set temperature is higher than the first reference temperature and lower than the second reference temperature , the air volume of the deprost vent 20a, the face vent 22a, and the floor vent 24a The mode doors 20, 22 and 24 for the defrost vent 20a, the face vent 22a and the floor vent 24a are set to the defrost vent 20a between the mix mode and the floor mode, Wherein the control unit controls the amount of opening of the air conditioner in a linear manner. The method according to claim 1,
The control unit (52)
The mode doors 20 and 22 for the defrost vent 20a, the face vent 22a and the floor vent 24a are changed to the floor mode if the value obtained by subtracting the detected indoor temperature from the set temperature is greater than the second reference temperature , 24) of the air conditioner (1). 5. The method according to any one of claims 2 to 4,
The control unit (52)
And the first and second reference temperatures are set lower as the outside air temperature is lower. The method according to claim 1,
An outside air temperature sensing means (60) for sensing an outside air temperature of the vehicle;
A memory unit 54 incorporating a reference temperature for each outside temperature;
Further comprising a detecting unit (56) for detecting, in the memory unit (54), a reference temperature corresponding to the outside temperature when the outside temperature is inputted from the outside temperature detecting unit (60)
The controller 52 controls the defrost vent 20a, the face vent 22a, and the floor vent (not shown) when the value obtained by subtracting the detected indoor temperature from the set temperature is smaller than the reference temperature detected by the detector 56, 22, 24 to the direction of the window glass in which the air flow rate of the deprost vent 20a is increased.

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