JP2603298Y2 - Auto air conditioner for automobile - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automotive air conditioner which controls an intake door in response to a relative increase in heat load accompanying a rise in ambient temperature in front of a condenser in a refrigeration cycle when the vehicle is stopped or the like.

[0002]

2. Description of the Related Art The structure shown in FIG. 5 has been put to practical use as a conventional automobile air conditioner. That is, an outside air temperature sensor 70 for detecting an outside air temperature, a room temperature sensor 71 for detecting a vehicle interior temperature, and a solar radiation sensor 7 for detecting an amount of solar radiation.
2, and each detection signal of the suction temperature sensor 73 for detecting the suction air temperature from the blower unit is sent to a controller 75 including a microcomputer via an input signal processing circuit 74 including an A / D converter and an input interface. Is entered. The controller 75 is provided with a temperature correction processing section 76 and an intake door opening degree calculation processing section 77. The temperature correction processing unit 76 applies an increase restriction of, for example, 0.2 ° C./min to the outside air temperature detected by the outside air temperature sensor 70, and performs the intake door opening degree calculation processing unit 77.
To enter.

That is, if the outside air temperature changes, the heat radiation amount of the condenser provided in the refrigeration cycle changes, and the heat load on the refrigeration cycle relatively changes. Therefore, in order to accurately detect the change in the heat load with respect to the refrigeration cycle based on the outside air temperature, it is preferable to detect the outside air temperature at the front of the condenser, and therefore, the outside air temperature sensor 70 is provided at the front of the condenser. Are located. However, when the outside air sensor 70 is disposed in front of the condenser in this manner, the outside air temperature sensor 70 is disposed in the engine room together with the condenser, so that the outside air sensor 70 is easily affected by heat from the engine and the like, so that the vehicle travels at a low speed. When the vehicle is stopped or when the vehicle is stopped, the detection value may suddenly rise due to the influence of the heat.

When the value of the outside air temperature that rises rapidly is used for control related to air conditioning such as control of an intake door and control of a blower motor, which will be described later, the opening degree of the intake door and the rotation speed of the blower motor are rapidly increased. Changes to
Comfort is impaired. Therefore, the temperature correction processing unit 7
From 6, the outside air temperature detected by the outside air temperature sensor 70 is 0.2
A corrected outside air temperature to which a rise limit of ° C./min is added is output so that the outside air temperature used for control related to air conditioning does not suddenly increase.

The room temperature sensor 71, the solar radiation sensor 72, and the corrected outside air temperature output from the temperature
The detection signal from the suction temperature sensor 73 and the output signal from the room temperature setting unit 78 that outputs a desired set temperature by the operation of the occupant are output from the intake door opening calculation processing unit 7.
7 is input. Intake door opening calculation processor 77
Calculates the intake door opening X _M with the values and the following formula indicated by these signals.

X _M = A × T _PTC + B × T _AM + C × Q _SUN + D × T _INC + E where A to E: constants (B, C and D are negative values) T _PTC : set temperature T _AM : correction Outside air temperature Q _SUN : Insolation T _INC : Vehicle interior temperature The intake door opening X _M calculated by the intake door calculation processing unit 77 is A / D converted by an output signal processing circuit 79 and converted into an A / D signal. The motor 81 of the intake door actuator 80 operates in response to the D-converted signal. The operation of the motor 81 drives an intake door (not shown), and the rotational position of the intake door is fed back to the controller 75 via the input signal processing circuit 74 detected by the position detection unit 82. As a result, the motor 81 is feedback-controlled, and the intake door is moved to the intake door opening X.
_The opening corresponding to _M is set.

[0007] Here, as the intake door is shown in FIG. 4, the intake door Smaller X _M is set to the inside air mode for fully opening the inside air inlet, the air clogging the air in the passenger compartment in the inner air mode It is suction-cooled and circulated and supplied into the vehicle interior. Also, if the value of X _M is greater than this,
An inside / outside air mode is set in which both the outside air introduction port and the inside air introduction port are half-opened. In the inside / outside air mode, both the inside air and outside air are suction-cooled and supplied to the vehicle interior. Also, X _M
Is further increased, an outside air mode in which the inside air introduction port is fully closed and the outside air introduction port is fully opened is set. In the outside air mode, outside air is suction-cooled and supplied to the vehicle interior.

[0008] In this case, the constant B used in the calculation of the intake door opening X _M, C, D is a negative value as described above. Therefore, the corrected outside air temperature T multiplied by this constant
_{If AM} , solar radiation Q _SUN , and vehicle interior temperature T _INC are large, on the contrary, X
The value of _M decreases, and the inside air mode is set. Therefore, if the vehicle interior temperature, the outside air temperature, and the amount of solar radiation are high and the interior temperature T _INC cannot be maintained at the set temperature T _PTC in the inside / outside air mode or the outside air mode, the inside air mode is formed to cool the inside air, By circulating the air into the cabin, the cooling efficiency is improved and the cabin temperature T _INC is maintained at the set temperature T _PTC . Further, when the vehicle interior temperature T _INC decreases with the elapse of the cooling time, the value of X _M increases even if the corrected outside air temperature T _AM and the amount of solar radiation Q _SUN do not change. Then, the mode is shifted from the inside / outside air mode to the outside air mode. Therefore, when the vehicle interior temperature T _INC decreases, by setting the outside air mode as much as possible,
A desired cooling effect can be obtained while performing ventilation. A structure similar to this prior art is disclosed, for example, in Japanese Utility Model Publication No. Sho 62-58925.

[0009]

By the way, the refrigerating cycle arranged in the air conditioner for the automobile cools the condenser not only by the air blown by the rotation of the condenser fan provided at the rear of the condenser but also by the traveling wind. To condense the refrigerant. Therefore, when the vehicle is in a stopped state or a low-speed running state, the condenser cannot be cooled by the traveling wind, and the condensation efficiency of the refrigerant is reduced, and the cooling effect is accordingly reduced.

However, in the conventional automotive air conditioner, the outside air temperature sensor 70 is disposed in front of the condenser because of the above-mentioned necessity, and the outside air temperature sensor 70
In order to avoid the inconvenience of the control due to the heat influence, the temperature correction processing unit 76 outputs a corrected outside air temperature obtained by adding a 0.2 / min increase limit to the outside air temperature detected by the outside air temperature sensor 70, and is used for control. The outside air temperature is prevented from rising rapidly. Thus, for example, even when the ambient temperature of the outside air temperature sensor 70 by the heat influence from the heat affected and the engine heat dissipation from the capacitor is reduced to the parked increases, the correction air temperature T _AM used in the calculation of X _M is The temperature rises only by 0.2 ° C. in one minute, and it takes a time corresponding to the 0.2 ° C./min rise limit until the corrected outside temperature T _AM actually reaches the temperature detected by the outside temperature sensor 70. .

For this reason, even when the cooling efficiency is reduced due to a decrease in the refrigerant condensation efficiency in the condenser while the vehicle is stopped, it takes time to shift from the outside air mode or the inside / outside air mode to the inside air mode. Formation is delayed. Therefore, until the inside air mode is formed, high-temperature outside air is sucked by the formation of the outside air mode or the inside / outside air mode.
Moreover, at this time, since the cooling efficiency has been reduced as described above, the drawn high-temperature outside air cannot be sufficiently cooled, and the temperature in the vehicle interior rises. When the temperature was 35 ° C., discomfort due to insufficient cooling occurred.

The present invention has been made in view of such a conventional problem, and when the heat load on the refrigeration cycle is relatively increased when the vehicle is stopped or the like, the inside air mode is formed without delay. It is an object of the present invention to provide an auto air conditioner for automobiles.

[0013]

According to the present invention, there is provided a vapor compression refrigeration cycle.
Is located in front of the installed capacitor to detect the outside air temperature.
Outside air temperature detection means, an intake door that opens and closes the outside air inlet and the inside air inlet, and changes the amount of inside and outside air introduced according to the degree of opening; and an intake door provided in the vapor compression refrigeration cycle. outside air temperature correction to output a cooling means for cooling the outside air to be introduced in accordance with the opening degree, the correction ambient temperature with a limited increase per unit time of the outside temperature outside air temperature detected by the detecting means within a predetermined value Means and at least the outside air detected by the corrected outside air temperature
Temperature as a variable, calculating means for calculating a door opening in a direction in which the outside air increases as the variable decreases, driving means for driving the intake door according to the door opening calculated by the calculating means, A heat load determining means for determining a relative increase in the heat load on the cooling means; and when the heat load determining means determines that the relative increase in the heat load on the cooling means is equal to or greater than a predetermined value, the outside air temperature detecting means.
The outside air temperature detected by the step and the outside air temperature correction means.
The difference from the corrected outside air temperature output from the stage is calculated, and the difference is calculated.
And opening correction means for correcting the direction of the inside air increases the door opening is provided in accordance with increase.

[0014]

In the above construction, when the outside air temperature detecting means detects the outside air temperature, the outside air temperature correcting means adds a rise limit of, for example, 0.2 ° C./min to the outside air temperature detected by the outside air temperature detecting means, and applies a limit per unit time. Output the corrected outside air temperature in which the change of the temperature is restricted within a certain value. Then, the calculation means executes a calculation using at least the corrected outside air temperature as a variable, and calculates a door opening in a direction in which the outside air increases as the variable decreases. Therefore, the driving means drives the intake door according to the door opening degree,
The inside air mode, the inside / outside air mode, and the outside air mode are formed according to the opening degree of the intake door, and the inside air or outside air introduced according to each mode is cooled by the cooling means.

On the other hand, when the heat load on the cooling means is relatively increased due to a decrease in the amount of heat radiated when the vehicle is stopped, and the heat load determining means determines that the heat load has exceeded a predetermined value, the cooling means is opened. Temperature correction means, the outside air temperature detection means
The outside air temperature detected by the outside air temperature correction means
Calculated from the corrected outside air temperature output from the
The door opening is corrected in such a direction that the inside air increases as it becomes smaller . Therefore, by the intake door is driven in accordance with the corrected door opening, the introduction amount of outside air decrease rapidly.

[0016]

An embodiment of the present invention will be described below with reference to the drawings. That is, as shown in FIG.
Is formed by sequentially connecting a blower unit 5, a cooling unit 6, and a heater unit 7 separated by casings 2, 3, and 4, respectively. The blower unit 5 includes a pair of intake doors 11 and 12 for opening and closing an outside air inlet 8 formed on a peripheral wall and opposed inside air inlets 9 and 10, and a fan 14 driven by a blower motor 13. Is provided. In the cooling unit 6, an evaporator 20 provided in a vapor compression refrigeration cycle as a cooling means is provided. In the heater unit 7, an introduction tank 15a and a discharge tank 15 are provided on both sides. And a heater core 16 that uses engine cooling water as a heat source.

The heater unit 7 is of a so-called two-layer flow type. The heater core 16 is disposed horizontally along the flow direction of the air supplied by the fan 14 and is located upstream of the heater core 16. An upstream air guide 18 that bisects the side ventilation surface 17 and a downstream air guide 21 that bisects the downstream ventilation surface 19 are provided. The upstream air guide 18 extends in the upstream direction along one side wall 22 of the casing 4, and is provided between the upstream air guide 18 and the upstream ventilation surface 17.
3 and a second introduction passage 24 between the first side wall 22 and the first side wall 22.
Is defined.

A first bypass passage 26 is formed between the outlet tank 15a and the other side wall 25 of the casing 4, and a second bypass passage 28 is provided between the introduction tank 15 and the rear wall 27 of the casing 4. Is formed. The boss 29 formed in the outlet tank 15a has a first introduction path 2
1 is provided at the upstream end of the first bypass passage 26 in cooperation with the first air mix door 30.
A vent bypass door 31 that opens and closes the intake passage 6 is provided, and a second air mix door 32 that opens and closes the second bypass passage 28 is provided at an end edge of the introduction tank 15.

A first air mix chamber 33 and a second air mix chamber 34 are provided on both sides of the downstream air guide 21. The first air mix chamber 33 has a defrost outlet 35 pointing toward the front window, and a center ventilator outlet 3 located at the center of an instrument panel disposed in the vehicle interior.
6 and side ventilator outlets 37 located on both sides,
37, and the side ventilator outlet 3
An air distribution control door 38 is provided between 7 and 37.

At the downstream end of the first air mix chamber 33, the ventilator outlets 36, 37, 37
, And a defrost door 40 for opening and closing the defrost outlet 35. On the other hand, the second air mix chamber 34 communicates with a foot outlet 41 provided at a lower portion in the vehicle interior. The foot outlet 41 is provided with a foot door 42 and the first and second air mix chambers are connected to each other. Chambers 33 and 34
A bypass door 43 is provided at a portion where the communication is established.

On the other hand, as shown in FIG.
Outside air temperature sensor 5 as outside air temperature detecting means for detecting _AMB
0, room temperature sensor 51 as room temperature detecting means for detecting vehicle interior temperature T _INC , solar radiation sensor 5 for detecting solar radiation amount Q _SUN
2, and each detection signal of the suction temperature sensor 53 for detecting the suction air temperature Tin from the blower unit 5 is constituted by a microcomputer via an input signal processing circuit 54 including an A / D converter and an input interface. It is input to the controller 55. The controller 5
5 includes a temperature correction processing unit 56 as an outside air temperature correction unit.
And an intake door opening degree calculation processing circuit 57. The temperature correction processing unit 56 generates a corrected outside air temperature T _AM by adding a 0.2 / min increase restriction to the outside air temperature T _AMB detected by the outside air temperature sensor 50, and inputs the corrected outside air temperature T _AM to the intake door opening calculation processing circuit 57. .

The intake door opening calculation processing circuit 57 includes a refrigeration cycle load increase determination unit 58 as a heat load determination unit, a normal intake door opening calculation processing unit 59 as a calculation unit, and a correction unit as a correction unit. An intake door opening degree calculation processing unit 60 at the time of load increase is provided. The corrected outside air temperature T output from the temperature correction processing unit 56
_AM and detection signals T _AMB , T _INC , T from the room temperature sensor 51, the solar radiation sensor 52, and the suction temperature sensor 53.
In and the output signal from the room temperature setting unit 61 that outputs the desired set temperature T _PTC by the operation of the occupant are input to the intake door opening calculation processing circuit 57.

The refrigeration cycle load increase judging section 58 in the intake door opening degree calculation processing circuit 57 has an outside air temperature T _AMB.
And a predetermined temperature L (for example, 48 ° C.), T _AMB ≦
If L, the load on the refrigeration cycle is determined to be normal, and if T _AMB > L, it is determined that the load on the refrigeration cycle when the vehicle is stopped is relatively increased. The normal-time intake door opening calculation processor 59 uses the corrected outside air temperature T _AM , the set temperature T _PTC , the solar radiation amount Q _SUN , and the vehicle interior temperature T _INC as variables to describe the normal-time intake door opening. and calculates the degree X _M. When the load increase determination unit 58 determines that the load on the refrigeration cycle when the vehicle is stopped is increasing, the intake door opening degree calculation processing unit 60 responds to the external temperature T in response to the determination.
Calculation is performed using _AMB , the amount of solar radiation, and the corrected outside air temperature T _AM as variables, and a corrected opening X _M ′ obtained by correcting the normal intake door opening X _M is calculated and output.

The normal intake door opening X calculated by the intake door arithmetic processing circuit 57 in this manner.
M or correction opening XM 'is input to the output signal processing circuit 62 is converted D / A, the motor 64 of the intake door actuator 63 as a driving means in response to the D / A converted signal is Operate. The intake doors 11 and 12 shown in FIG. 2 are driven by the operation of the motor 64, and the rotational positions of the intake doors 11 and 12 are detected by a position detection unit 65 and the input signal processing circuit 5 is turned on.
4 is fed back to the controller 55.
As a result, the motor 64 is feedback-controlled,
The intake doors 11 and 12 are provided with the intake door opening X.
M or the opening corresponding to the corrected opening XM '.

In order to accurately detect a change in the heat load on the refrigeration cycle based on the outside air temperature, it is preferable that the outside air temperature be detected at the front of the condenser of the refrigeration cycle. , Is disposed in front of the condenser of the refrigeration cycle having the evaporator 20.

Next, the operation of this embodiment having the above configuration will be described with reference to the flowchart shown in FIG. That is, the controller 55 starts the control according to this flowchart by turning on an air conditioner switch (not shown), and first, the respective sensors 50, 51, 5
2 and 53 and the set temperature data from the room temperature setter 61 are read (S1). Then, the temperature correction processing unit 56 sets the outside air temperature T _AMB detected by the outside air temperature sensor 50 to
A corrected outside air temperature T _AM is generated by adding a 0.2 / min rise limit, and is input to the intake door opening degree calculation processing circuit 57.
As a result, the normal intake door opening calculation processor 59
It is set the temperature T _PTC, correcting the outside air temperature T _AM, solar radiation Q _SUN, calculates the normal intake door opening X _M using the following equation as a variable cabin temperature T _INC (S3).

X _M = A × T _PTC + B × T _AM + C × Q _SUN + D × T _INC + E where A to E are constants (B, C and D are negative values). Performs the refrigeration cycle load increase determination by directly using the outside air temperature T _AMB detected by the outside air temperature sensor 50 and comparing the outside air temperature T _AMB with a predetermined temperature L (S4). That is, for the reason described above, the outside air temperature sensor 50 is disposed at the front of the condenser. Therefore, if the heat radiation amount of the condenser decreases when the vehicle stops or runs at a low speed, and the heat load on the refrigeration cycle relatively increases, the condenser is affected by heat radiation from the condenser and the engine.
The detection value of the outside air temperature sensor 50 increases. Therefore, by determining whether or not the outside air temperature T _AMB which is the value of the outside air temperature sensor 50 is larger than the predetermined value L, the load on the refrigeration cycle has relatively increased with the stop of the vehicle or running at low speed. Can be determined.

If the determination is NO and the vehicle is running and the heat load on the refrigeration cycle is not relatively increasing, the opening correction value α = 0 is set (S5). . That is, the load increase during the intake door opening computing unit 60 by the processing of the S5, the outputs opening correction value 0, thus then in X _M correction processing in (S8), normal intake door opening X _M Is calculated by adding the opening correction value α to the opening correction value X _M ′, X _M = X _M ′.
Normally, the intake door opening _XM is output without correction. Therefore, this X _M ′ (=
X _M ) to drive the intake doors 11 and 12,
Doing outside air inlet position change processing (S9), the intake door 11 is normally set to the intake door opening X _M.

[0029] That is, by the intake door actuator 63 drives the intake door 11, 12 in accordance with normal intake door opening X _M, inside air mode, and outside air mode, either of the outside air mode is set,
Inside air or outside air is sucked into the air conditioner main body 1 as the blower fan 14 rotates according to each mode. The drawn inside air or outside air is cooled by the evaporator 20, and then passes through the first and second bypass passages 26 and 28 according to the opening degrees of the first and second air mix doors 30 and 32,
The air is supplied into the vehicle cabin from the center and side ventilator outlets 36 and 37 which are kept open during cooling.

At this time, as described above, the expression X _M = A × T
_{In PTC} + B × T _AM + C × Q _SUN + D × T _INC + E,
Since the constants B, C, and D are negative values, when the corrected outside air temperature T _AM , the solar radiation amount Q _SUN , and the vehicle interior temperature T _INC are high, X
The value of _M becomes smaller, thereby forming the inside air mode as shown in FIG. Further, if the vehicle interior temperature T _INC decreases as the cooling time elapses, the value of X _M increases even if the corrected outside air temperature T _AM and the amount of solar radiation Q _SUN do not change. Shift to the outside air mode.
Therefore, when the vehicle interior temperature T _INC is lowered, by setting the outside air mode as much as possible, a desired cooling effect can be obtained while performing ventilation.

Then, as described above, the intake door 11,
When the vehicle stops or runs at a low speed in a state where air conditioning is being performed while controlling the opening of the compressor 12, the cooling of the condenser by the traveling wind becomes insufficient, the refrigerant condensation efficiency is reduced, and the heat load on the refrigeration cycle is reduced. Increases relatively. Further, the ambient temperature of the outside air temperature sensor 50 rises due to a thermal effect due to a decrease in the amount of heat radiation and a rise in the temperature of the capacitor and a thermal effect from the engine. At this time, the corrected outside air temperature T _AM used in the calculation of X _M rises only by 0.2 ° C. per minute, and is not changed until the corrected outside air temperature T _AM actually reaches the temperature detected by the outside air temperature sensor 50. Requires a time corresponding to a 0.2 ° C./min rise limit.

However, since the refrigeration cycle increase determination unit 58 performs the above-described determination using the outside air temperature T _AMB detected by the outside air temperature sensor 50, when the outside air temperature T _AMB becomes _equal to or higher than L, the processing proceeds from S4. Proceeding to S6, the opening correction value α is calculated using the following equation.

Α = −J × (T _AMB −T _AM ) where J is a constant. That is, the opening correction value α corresponding to the difference between the current outside air temperature T _AMB and the corrected outside air temperature T _AM is calculated. , Α are corrected using the following equation (S7).

Α = α × 1 / K × Q _SUN Therefore, by sequentially executing the processing of S6 and S7, α = −J × ( _TAMB- T _AM ) × Q _SUN / K is calculated. It will be.

In step S8, the opening correction value X _M ′ is calculated as X _M ′ = X _M + α in the same manner as described above. As described above, α = −J × ( _TAMB- T _AM ). Since X Q _SUN / K, X _M ′ = X _M −J × ( _TAMB- T _AM ) × Q _SUN / K. Therefore, the normal intake door opening X _M 'is corrected to, the correction opening X _M' correction opening X _M is this smaller value by driving the intake door 11, 12 with, said intake door 11 and 12 are driven in the inside air mode side in accordance with the outside air temperature T _AM and solar radiation Q _SUN. Therefore, if the amount of heat radiated from the capacitor decreases and the ambient temperature of the outside air temperature sensor 50 increases due to its thermal influence or thermal influence from the engine, the value of X _M ′ decreases, and the intake doors 11 and 12 are delayed. It switches to shy mode without it. As a result, the inside air is circulated and supplied to the evaporator 20 to enhance the cooling effect, and it is possible to perform cooling without stopping the occupant during cooling at low speed while the vehicle is stopped.

[0036]

In the present invention, as described above, according to the invention] is, the outside air temperature
Temperature detection means for detecting temperature
Because it is located at the front of the capacitor provided inside,
The change in heat load to the refrigeration cycle
It can be detected frequently. By means of outside temperature detection
Increase the detected outside air temperature per unit time
Of the intake door using the corrected outside air temperature
Because the opening is controlled, the front of the capacitor
Even if the outside air temperature detection means is placed in the
Does not change drastically, providing a comfortable feeling
There is no loss. Cooling means in the refrigeration cycle
When the relative increase in heat load with respect to
The outside air temperature detected by the outside air temperature detecting means and the outside air temperature;
The difference from the corrected outside air temperature output from the air temperature correction means.
As the difference increases, the door opening increases
When the vehicle is stopped, etc.
When the heat load of the cooling means increases relatively in
The cooling effect is enhanced, and the occupants do not feel insufficient cooling.
In addition, cooling can be performed. Therefore, the above ~
Changes in heat load on the refrigeration cycle
Detects with higher accuracy depending on the degree, and is usually taken in
A during normal times due to sudden changes in
While maintaining a comfortable feeling, the heat of the cooling
When the load increases relatively, the cooling effect increases,
It is possible to perform cooling without letting the staff feel insufficient cooling
It becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an automotive air conditioner according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing the structure of the air conditioner body of the embodiment.

FIG. 3 is a flowchart showing a control procedure of the embodiment.

FIG. 4 is a diagram showing a relationship between an opening degree of an intake door and a mode.

FIG. 5 is a block diagram showing a conventional automobile air conditioner.

[Explanation of symbols]

5 Blower unit 8 Outside air inlet 9 Inside air inlet 10 Inside air inlet 11 Intake door 12 Intake door 13 Evaporator (cooling means) 50 Outside air temperature sensor (detecting means) 51 Room temperature sensor (detecting means) 52 Solar radiation sensor (detecting means) 56 Temperature correction processing section (outside air temperature correction means) 58 Refrigeration cycle load increase determination section (heat load determination means) 59 Normal intake door opening calculation processing section (calculation means) 60 Intake door opening calculation processing section when load increases ( Opening correction means)

Claims (1)

(57) [Scope of request for utility model registration] 1. A refrigerating cycle provided in a vapor compression refrigeration cycle.
Outside air that is located at the front of the condenser and detects outside air temperature
A temperature detection unit, an intake door that opens and closes the outside air inlet and the inside air inlet and changes the amount of inside and outside air introduced according to the opening, and an opening of the intake door provided in the vapor compression refrigeration cycle. outside air is the cooling means for cooling the outside air, increasing the <br/> correction outside air temperature limit within a certain value output per the outside air temperature unit of the outside air temperature detected by the detecting means time introduced in accordance with the Temperature correcting means; calculating means for calculating at least the corrected outside air temperature as a variable, and calculating a door opening in a direction in which the outside air increases as the variable decreases; and the intake door according to the door opening calculated by the calculating means. A driving means for driving the cooling means; a heat load determining means for determining a relative increase in the heat load on the cooling means; When pairs increase is determined to be a predetermined or more, the outer
The outside air temperature detected by the air temperature detection means and the outside air
The difference between the corrected outside air temperature output from the temperature correction means and
And an opening correction means for calculating and correcting the door opening in a direction in which the inside air increases as the difference increases.