JP3684725B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle air conditioner in which a first air passage and a second air passage are formed in an air conditioning case, and inside air can be introduced into the first air passage and outside air can be introduced into the second air passage. .
[0002]
[Prior art]
As a first prior art of the vehicle air conditioner as described above, there is one disclosed in JP-A-5-124426. Briefly describing the configuration of this prior art, an air conditioning case of a vehicle air conditioner has an inside air inlet and an outside air inlet formed at one end thereof, and a foot outlet, a defroster outlet, and a face outlet at the other end. Each outlet is formed.
[0003]
The air conditioning case includes a partition plate and a first air passage from the inside air inlet to the foot outlet, and a second air passage from the outside air inlet to the defroster outlet and the face outlet. The air conditioning case is provided with a blowing means for generating an air flow, a cooling heat exchanger, and a heating heat exchanger.
[0004]
When the foot differential mode is selected as the blowing mode, a two-layer mode is adopted in which inside air is introduced into the first air passage and outside air is introduced into the second air passage. By doing so, the interior of the vehicle is heated with the already warmed inside air, so that the heating performance is improved and the low-humidity outside air is blown out to the window glass, so that the anti-fogging performance of the window glass is improved.
[0005]
A second prior art is disclosed in Japanese Patent Laid-Open No. 7-47831. The configuration of this prior art is the same as the first prior art, in which an inside air inlet and an outside air inlet are formed at one end of the air conditioning case, and a foot outlet, a defroster outlet, and a face outlet are provided at the other end. Each is formed. And in this air-conditioning case, the partition plate, the ventilation means, the cooling heat exchanger, and the heating heat exchanger which partition and form the said 1st air path and the said 2nd air path are provided.
[0006]
Further, this second prior art describes that a detecting means for detecting the cold air temperature immediately after passing through the cooling heat exchanger is provided.
[0007]
[Problems to be solved by the invention]
However, none of the above-described conventional techniques describes a specific arrangement position of the detection means.
Therefore, an object of the present invention is to clarify a preferable arrangement position of the detection means.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present inventors
An inside air inlet and an outside air inlet are formed on one end side, and a foot opening that blows wind toward at least the feet of passengers in the passenger compartment and a defroster opening that blows wind toward the inner surface of the vehicle window glass are formed on the other end. A formed air conditioning case;
In the air conditioning case, a partition member that partitions and forms a first air passage from the inside air inlet to the foot opening and a second air passage from the outside air inlet to the defroster opening,
A blowing means for generating an air flow from the one end side toward the other end side in the first and second air passages;
In the vehicle air conditioner provided in the first and second air passages and provided with a cooling heat exchanger for cooling the air in the air passages,
(1) a case in which detection means for detecting the degree of air cooling in the cooling heat exchanger (specifically, the cold air temperature immediately after passing through the cooling heat exchanger) is provided on the first air passage side; 2) The following experiments were conducted for the case where the second air passage was provided.
[0009]
That is, in the case where (1) the detection means is provided on the first air passage side, an experimental temperature sensor is provided in the direct air downstream portion of the cooling heat exchanger on the second air passage side, and (2) In the case where the detection means is provided on the second air passage side, an experimental sensor is provided on the downstream side of the direct air of the cooling heat exchanger in the first air passage. Then, the cooling by the cooling heat exchanger is stopped when the detected temperature of the detecting means is 3 (° C.) or lower, and the cooling by the cooling heat exchanger is performed when the detected temperature is 4 (° C.) or higher. Experiments were conducted on the temperature detected by the experimental sensor when the test was performed under various outside air temperatures.
[0010]
As a result, (1) the data shown in FIG. 9 is obtained when the detection means is provided on the first air passage side, and (2) the data shown in FIG. 10 is obtained when the detection means is provided on the second air passage side. The data shown in Fig. 1 were obtained.
From these data, it can be seen that: (1) When the detection means is provided on the first air passage side (FIG. 9), the outside air temperature is 0 (° C.) or less in the second air passage side for cooling. The heat exchanger can be frosted. Actually, in the above experiment, data in the range where the outside air temperature is 0 (° C.) or less is not taken, but the above can be estimated from the temperature change.
[0011]
On the other hand, (2) when the detection means is provided on the second air passage side, as shown in FIG. 10, even if the dehumidifying performance on the first air passage side is somewhat degraded, (1) first There is no possibility that the cooling heat exchanger will be frosted as in the case where the detection means is provided on the air passage side.
The invention according to claims 1 to 4 made in view of the above,
The detection means is provided in the second air passage, and the operation of the cooling heat exchanger is controlled based on the temperature detected by the detection means.
[0012]
Therefore, as shown in FIG. 10, the problem that the heat exchanger for cooling is frosted can be prevented.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, 1st Embodiment of this invention is described based on FIGS.
In this embodiment, each air-conditioning means in an air-conditioning unit that air-conditions a vehicle interior space of a vehicle equipped with a diesel engine is controlled by an air-conditioning control device (hereinafter referred to as ECU).
[0014]
First, the configuration of the air conditioning unit will be described with reference to FIG.
The air conditioning unit 1 is mounted on the vehicle such that the upper side in FIG. 1 is the front side of the vehicle (engine side), the lower side of FIG. 1 is the rear side of the vehicle (inside the vehicle compartment), and the left-right direction in FIG. An air conditioning case 2 is provided that forms an air passage for guiding conditioned air into the room.
The air conditioning case 2 is formed of a resin material such as polypropylene, and is configured by connecting an inside / outside air switching box 3, a cooler unit 4, and a heater unit 5 in order from the air upstream side. Note that broken lines X and Y in FIG. 1 indicate these binding sites.
[0015]
The inside / outside air switching box 3 is for taking at least one or both of inside air and outside air into the air conditioning case 2, and a blower 6 for generating an air flow is disposed therein. The inside / outside air switching box 3 and the blower 6 will be described later with reference to FIG.
In the cooler unit 4, the air passing through itself is cooled, and the refrigerant evaporator 7 constituting one component of the refrigeration cycle device 7 a mounted on the vehicle covers the entire air passage in the air conditioning case 2. Arranged. The refrigeration cycle apparatus 7a includes a compressor 7b that compresses a refrigerant by the driving force of an automobile engine, a condenser 7c that condenses and liquefies the compressed refrigerant, and gas-liquid separation of the condensed and liquefied refrigerant is only liquid refrigerant. The receiver 7d is configured to flow downstream, an expansion valve 7e that decompresses and expands the liquid refrigerant, and the evaporator 7.
[0016]
The compressor 7b is connected to an electromagnetic clutch 7f that transmits or shuts off engine power to the compressor 7b. When the electromagnetic clutch 7f is energized, the engine power is transmitted to the compressor 7b and the evaporator 7 performs air cooling. When the electromagnetic clutch 7f is de-energized, the engine and the compressor 7b are energized. Is cut off, and the air cooling action by the evaporator 7 is stopped.
[0017]
The heater unit 4 is provided with a heater core 8 for reheating the cold air that has passed through the refrigerant evaporator 7. As shown in FIG. 2 which is a sectional view taken along the line AA in FIG. 1 and FIG. 3 which is a sectional view taken along the line BB in FIG. 1, the heater core 8 has a bypass passage 9a through which the cold air bypasses the heater core 8. 9b is provided in the air conditioning case 2 so that the cooling water of the engine flows therein, and the cooling air is reheated by using the cooling water as a heat source.
[0018]
A rotary shaft 10 is provided on the air upstream side of the heater core 8 so as to be rotatable with respect to the air conditioning case 2. Further, plate-like air mix doors 11 and 11 are integrally coupled to the rotary shaft 10 so that the plate surfaces thereof are the same. The rotary shaft 10 is connected to a servo motor 40 (see FIG. 5) as a driving means thereof. When the rotary shaft 10 is rotated by the servo motor 40, the air mix doors 11, 11 are connected. Are integrally rotated between the solid line position and the one-dot chain line position in FIGS. That is, the air mix doors 11 and 11 adjust the ratio of the amount of cold air passing through the heater core 8 and the amount of cold air passing through the bypass passages 9a and 9b (FIGS. 2 and 3) depending on the stop position, It functions as a temperature adjusting means for adjusting the blown air temperature.
[0019]
The cooler unit 4 and the heater unit 5 are coupled by, for example, claw fitting or a screw member as coupling means. In the cooler unit 4 and the heater unit 5, as shown in FIG. 1, a first air passage 13 and a second air passage 14 are partitioned by a partition wall 12 extending in a substantially vertical direction. . Further, the refrigerant evaporator 7, the heater core 8, and the rotating shaft 10 are disposed across the first air passage 13 and the second air passage 14.
[0020]
A foot opening 15, a defroster opening 16, and a face opening 17 are formed at the most downstream end of the air conditioning case 2.
A foot duct (not shown) is connected to the foot opening 15, and the conditioned air introduced into the foot duct passes from the foot outlet at the downstream end of the foot duct to the feet of passengers in the passenger compartment. It is blown out toward.
[0021]
Further, a defroster duct (not shown) is connected to the defroster opening 16, and the conditioned air introduced into the defroster duct passes from the defroster outlet at the downstream end of the defroster duct to the inner surface of the vehicle windshield. It is blown out toward.
The face opening 17 is connected to a center face duct and a side face duct (not shown). Of these, the conditioned air introduced into the center face duct is blown out from the center face outlet, which is the downstream end of the center face duct, toward the upper body of the passenger in the passenger compartment, and is introduced into the side face duct. The conditioned air is blown out toward the vehicle side glass from the side face outlet which is the downstream end of the side face duct.
[0022]
A foot door 18, a defroster door 19, and a face door 20 are provided upstream of the openings 15 to 17. The foot door 18 is a door that opens and closes an air inflow passage to the foot duct, the defroster door 19 is a door that opens and closes an air inflow passage to the defroster duct, and the face door 20 is the center face duct. A door that opens and closes the air inflow passage to
The doors 18 to 20 are connected by a link mechanism (not shown), and the link mechanism is driven by a servo motor 41 (see FIG. 5) as a driving unit. That is, when the servo motor 41 moves the link mechanism, the doors 18 to 20 move so as to obtain each blowing mode described later.
[0023]
The air inflow passage to the side face duct is not opened or closed by the doors 18 to 20. In the vicinity of the side face air outlet, an unillustrated air outlet grill is provided in which an occupant manually opens and closes the side face air outlet, and the air inflow passage to the side face duct is opened and closed by the air outlet grill. The partition wall 12 is interrupted at the upstream side of the openings 15 to 17 and at the downstream side of the heater core 8. The first air passage 13 and the second air passage 14 are disconnected at the interrupted portion. A communication hole 21 that communicates with each other is formed. The communication hole 21 is opened and closed by the foot door 18.
[0024]
Next, the inside / outside air switching box 3 and the blower 6 will be described with reference to FIG. FIG. 3 is a schematic perspective view seen from the direction of arrow C in FIG.
As shown in FIG. 4, the inside / outside air switching box 3 is composed of an inside / outside air case 3a that constitutes the most upstream side of the air conditioning case 2 and the blower 6 that is housed in the inside / outside air case 3a. .
[0025]
The blower 6 is disposed substantially in the center of the inside / outside air case 3a, and includes a first fan 6a, a second fan 6b, and a blower motor 6c that rotationally drives the fans 6a and 6b. Here, the first fan 6a and the second fan 6b are integrally formed, and the diameter of the second fan 6b is larger than the diameter of the first fan 6a.
[0026]
And these 1st fan 6a and 2nd fan 6b are each accommodated in the scroll casing parts 22 and 23 in which the suction side exhibits bellmouth shape. The end portions (air blowing sides) of the scroll casing portions 22 and 23 communicate with the first air passage 13 and the second air passage 14, respectively. Further, the scroll casing portions 22 and 23 share the partition portion 24.
[0027]
On the other hand, the inside / outside air case 3a is formed with a first inside air suction port 26 corresponding to the suction port 25 of the first fan 6a, and a second inside air suction corresponding to the suction port 27 of the second fan 6b. A mouth 28 and an outside air inlet 29 are formed. In the inside / outside air case 3a, a first suction port opening / closing door 30 for opening / closing the first inside air suction port 26, and a second suction for selectively opening / closing the second inside air suction port 28 and the outside air suction port 29 are provided. A mouth opening / closing door 31 is provided.
[0028]
The first suction port opening / closing door 30 and the second suction port opening / closing door 31 are connected to servomotors 42 and 43 (see FIG. 5) as respective drive means. Are rotated between a solid line position and an alternate long and short dash line position in the figure.
Further, the inside / outside air case 3a is formed with a communication passage 32 that communicates the second inside air suction port 28 or the outside air suction port 29 with the suction port 25. The first intake opening / closing door 30 fully closes the communication passage 32 and fully closes the first indoor air intake port 26 when the first indoor air intake port 26 is fully opened (the position indicated by the solid line in FIG. 4). At times (the one-dot chain line position in FIG. 4), the communication passage 32 is fully opened.
[0029]
Next, the configuration of the control system of this embodiment will be described with reference to FIG.
The ECU 33 that controls each air-conditioning means of the air-conditioning unit 1 receives each signal from each switch (for example, a temperature setting switch for the passenger to set the vehicle interior set temperature) on the operation panel 34 provided in the front of the vehicle interior. Entered.
Further, the ECU 33 includes an inside air temperature sensor 35 that detects the air temperature in the vehicle interior, an outside air temperature sensor 36 that detects the outside air temperature, a solar radiation sensor 37 that detects the amount of solar radiation irradiated into the vehicle interior, and engine cooling that flows into the heater core 8. Each signal is input from a water temperature sensor 38 that detects the water temperature and a post-evaporator sensor 39 that detects the degree of air cooling of the refrigerant evaporator 7 (specifically, the air temperature immediately after passing through the evaporator).
[0030]
Among these, as shown in FIG. 1, the post-evaporator sensor 39 is a temperature sensor that is provided in a portion of the second air passage 14 on the downstream side of the direct air of the evaporator 7 and detects the cold air temperature in this portion. is there.
The ECU 33 is provided with a known microcomputer including a CPU, ROM, RAM, and the like (not shown), and signals from the sensors 35 to 39 are A / D converted by an input circuit (not shown) in the ECU 33. After that, it is configured to be input to the microcomputer. The ECU 33 is supplied with power from a battery (not shown) when an ignition switch (not shown) of an automobile engine is turned on.
[0031]
Next, the control processing of the microcomputer of this embodiment will be described with reference to FIG.
First, when the ignition switch is turned on and power is supplied to the ECU 33, the routine shown in FIG. 6 is started. In step 100, each initialization and initial setting are performed. In the next step 110, the above temperature setting device is used. Enter the set temperature.
[0032]
In the next step 120, a signal obtained by A / D converting the values of the sensors 35 to 39 is read.
Then, in the next step 130, a target blowing temperature (TAO) into the vehicle compartment is calculated based on the following formula 1 stored in advance in the ROM.
[0033]
[Expression 1]
TAO = Kset * Tset-Kr * Tr-Kam * Tam-Ks * Ts + C
Tset is a set temperature by the temperature setter, Tr is a detected value of the inside air temperature sensor 35, Tam is a detected value of the outside air temperature sensor 36, and Ts is a detected value of the solar radiation sensor 37. Kset, Kr, Kam, and Ks are gains, and C is a correction constant.
[0034]
Next, in step 140, a blower voltage (voltage applied to the blower motor 6c) corresponding to the TAO is calculated from a map (not shown) stored in advance in the ROM.
In the next step 150, the blowing mode corresponding to the TAO is determined from a map (not shown) stored in advance in the ROM. Here, in the determination of the blowing mode, the face mode, the bi-level mode, the foot mode, and the foot differential mode are determined from the lower TAO to the higher TAO.
[0035]
The face mode is a mode in which the conditioned air is blown out toward the upper body of the passenger in the passenger compartment, with the foot door 18 as the one-dot chain line position in FIG. 1, the defroster door 19 as the solid line position, and the face door 20 as the one-dot chain line position. In addition, the bi-level mode is a mode in which the foot door 18 and the defroster door 19 are in a solid line position and the face door 20 is in a one-dot chain line position, and air-conditioning air is blown toward the upper body and feet of the occupant.
[0036]
Further, the foot mode means that the foot door 18 and the face door 20 are in a solid line position, the defroster door 19 is a position where the defroster opening 16 is slightly opened, and about 80% of the conditioned air is blown out toward the occupant's feet. In this mode, 20% is blown out toward the inner surface of the windshield. The foot differential mode is a mode in which the foot door 18 is in a solid line position, the defroster door 19 is in an alternate long and short dash line position, and the face door 20 is in a solid line position, and air-conditioning air is blown to the feet of the passenger and the inner surface of the windshield in equal amounts. .
[0037]
In this embodiment, when a defroster switch (not shown) provided on the operation panel 34 is operated, the foot door 18 and the defroster door 19 are set to the alternate long and short dash line position, the face door 20 is the solid line position, and the conditioned air is applied to the inner surface of the windshield A mode to blow out is set.
In any of the blowing modes, the side face outlet can be opened and closed by the outlet grill.
[0038]
In step 160, the target opening (SW) of the air mix door 11 is calculated based on the following formula 2 stored in the ROM in advance.
[0039]
[Expression 2]
SW = ((TAO−Te) / (Tw−Te)) × 100 (%)
Te is a value detected by the post-evaporator sensor 39, and Tw is a value detected by the water temperature sensor 38. When calculated as SW ≦ 0 (%), the air mix door 11 is controlled to a position where all the cold air from the refrigerant evaporator 7 passes through the bypass passages 9a and 9b (FIGS. 2 and 3). When calculated as SW ≧ 100 (%), the air mix door 11 is controlled to a position where all of the cold air passes through the heater core 8. When 0 (%) <SW <100 (%), the cold air is controlled to a position where it passes through both the heater core 8 and the bypass passages 9a and 9b.
[0040]
In the next step 170, the operation of the compressor 7b is controlled based on the detection value Te of the post-evaporator sensor 39. Specifically, when the detected value Te of the post-evaporator sensor 39 is equal to or higher than the first predetermined temperature (4 (° C.) in the present embodiment), the energization control of the electromagnetic clutch 7f is performed so that the compressor 7b is turned on, When the detected value Te of the post-evaporator sensor 39 is equal to or lower than the second predetermined temperature (3 (° C.) in the present embodiment), the energization control of the electromagnetic clutch 7f is performed so that the compressor 7b is turned off.
[0041]
Then, in the next step 180, the subroutine shown in FIG. 7 is called to determine the positions of the first inlet opening / closing door 30 and the second inlet opening / closing door 31.
Specifically, in step 1000 of FIG. 7, the inside / outside air mode is determined from the map of FIG. 8 stored in advance in the ROM.
In the next step 1100, it is determined whether or not the inside / outside air mode determined in step 1000 is the outside air introduction mode. Here, when it is determined as NO, that is, when it is determined as the inside air circulation mode, the routine jumps to step 1600, where the first inlet opening / closing door 30 is moved to the position indicated by the solid line in FIG. This is determined as the one-dot chain line position in FIG. That is, at this time, the mode is such that the inside air is introduced into both the first air passage 13 and the second air passage 14. Thereafter, the subroutine is exited.
[0042]
If YES in step 1100, the blow mode determined in step 150 of FIG. 6 is set to the foot mode (FOOT) or the foot differential mode (F / D) in the next step 1200. It is determined whether or not. That is, it is determined whether or not the vehicle interior heating mode and the window glass antifogging mode are both performed. If NO in step 1200, the process jumps to step 1500 to determine the first suction opening / closing door 30 as the one-dot chain line position in FIG. 4 and the second suction opening / closing door 31 as the solid line position. . That is, at this time, the mode is such that outside air is introduced into both the air passages 13 and 14. Thereafter, the subroutine is exited.
[0043]
On the other hand, when YES is determined in step 1200, it is determined in step 1300 whether or not the target opening degree SW of the air mix door 11 determined in step 160 of FIG. 6 is 100 (%) or more. To do. That is, it is determined whether or not the air mix door 11 is controlled to a position where all of the cold air from the refrigerant evaporator 7 passes through the heater core 8 (solid line position in FIGS. 2 and 3, hereinafter referred to as “max hot position”).
[0044]
Here, when it is determined as NO, it means that the heating capacity is surplus with respect to the target temperature, and the process proceeds to the process of step 1500 and the outside air is introduced into both the air passages 13 and 14. Mode. On the other hand, when the determination is YES, it means that the heating capacity is insufficient with respect to the target temperature, and the process proceeds to step 1400, where the first inlet opening / closing door 30 and the second inlet opening / closing door 31 are set. The positions are determined as the solid line positions in FIG. That is, it is determined to be in the two-layer mode in which the inside air is introduced into the first air passage 13 and the outside air is introduced into the second air passage 14. Thereafter, the subroutine is exited.
[0045]
When the series of processes in FIG. 7 is completed in this way, the process proceeds to step 190 in FIG. 6, and the motors 6 c, 40 to 40 are obtained so that the modes calculated or determined in steps 140 to 180 are obtained. A control signal is output to 43.
Then, in the next step 200, the process returns to step 110 after the elapse of τ which is the control cycle time.
[0046]
As described above, according to the present embodiment, as described with reference to FIG. 10, the evaporator 7 is based on the detection value of the post-evaporator sensor 39 provided on the second air passage 14 side through which the outside air flows. Therefore, the frost of the evaporator 7 can be surely prevented.
(Other embodiments)
In the above embodiment, the post-evaporator sensor 39 is provided in the direct air downstream portion of the evaporator 7, but it may be directly attached to the fin of the evaporator 7.
[0047]
When the defroster mode is set by the above-described defroster switch (defroster mode instruction means) (not shown) provided on the operation panel 34 in addition to the configurations of the above embodiments, the air mix door 11 is set to the maximum hot position. Regardless of this, the first inlet opening / closing door 30 may be located at the position of the one-dot chain line in FIG. As a result, when the outside air introduction mode is set, outside air is always introduced into the air passages 13 and 14, so that the anti-fogging performance of the windshield can be improved.
[0048]
In each of the above embodiments, the heating heat exchanger referred to in the inventions of claims 1 and 2 is configured by the heater core 8 using engine cooling water as a heat source. Alternatively, a heat pump refrigeration cycle condenser or the like may be used.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a ventilation system according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a cross-sectional view taken along the line BB in FIG. 1;
4 is a schematic perspective view seen from the direction of arrow C in FIG.
FIG. 5 is a block diagram of a control system of the embodiment.
FIG. 6 is a flowchart showing control processing by the microcomputer of the embodiment.
FIG. 7 is a flowchart showing processing in step 180 of FIG.
FIG. 8 is a map for the inside / outside air mode of the embodiment.
FIG. 9 is experimental data when cooling degree detection means is provided on the first air passage side.
FIG. 10 is experimental data when a cooling degree detection means is provided on the second air passage side.
[Explanation of symbols]
1 Air Conditioning Unit 2 Air Conditioning Case 6 Blower (Blower)
7 Evaporator (cooling heat exchanger)
7a Refrigeration cycle apparatus 7b Compressor 7c Condenser 7d Receiver 7e Expansion valve (pressure reduction means)
7f Electromagnetic clutch 12 Partition wall (partition member)
13 First air passage 14 Second air passage 15 Foot opening 16 Defroster opening 17 Face opening 26 First inside air inlet (inside air inlet)
29 Outside air inlet 39 Evaporator rear sensor (cooling degree detecting means)

Claims (4)

An inside air inlet (26) and an outside air inlet (29) are formed on one end side, a foot opening (15) for blowing air toward at least the feet of passengers in the vehicle interior, and an inner surface of the vehicle window glass on the other end side An air-conditioning case (2) in which a defroster opening (16) for blowing air toward is formed;
In the air conditioning case (2), a first air passage (13) from the inside air inlet (26) to the foot opening (15) and a defroster opening (16) from the outside air inlet (29) are provided. A partition member (12) that partitions the second air passage (14) from
In the first and second air passages (13, 14), blowing means (6) for generating an air flow from the one end side toward the other end side;
In a vehicle air conditioner provided with a cooling heat exchanger (7) provided in the first and second air passages (13, 14) and cooling air in the air passages (13, 14),
In the second air passage (14), a cooling degree detection means (39) for detecting the degree of air cooling in the cooling heat exchanger (7) is provided,
A vehicle air conditioner that controls the operation of the cooling heat exchanger (7) based on the temperature detected by the cooling degree detecting means (39). The cooling heat exchanger (7) includes a compressor (7b) that compresses the refrigerant, a condenser (7c) that condenses the refrigerant from the compressor (7b), and the refrigerant from the condenser (7c). 2. The vehicle air conditioner according to claim 1, wherein the vehicular air conditioner is an evaporator (7) that constitutes a refrigeration cycle (7a) together with a decompression means (7e) for decompressing and evaporates the refrigerant from the decompression means (7e). . The said cooling degree detection means (39) is provided in the air downstream side site | part of the said heat exchanger (7) for cooling among the said 2nd air passages (14). The vehicle air conditioner described. When the temperature detected by the cooling degree detecting means (39) is equal to or higher than a predetermined temperature, air cooling action is performed by the cooling heat exchanger, and when the temperature detected by the cooling degree detecting means (39) is equal to or lower than the predetermined temperature. The vehicle air conditioner according to any one of claims 1 to 3, wherein an air cooling action by the cooling heat exchanger is stopped.

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