JPH09328008A - Air conditioner for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To materialize in a high level a cold air amount increasing function at vent mode time and a vertical difference temperature ensuring function at bilevel mode time, in an air conditioner for an automobile provided with an air conditioner unit arranging a max cool door in parallel to an air mix door for ensuring cold air amount increasing at vent mode time and vertical difference temperature at bilevel mode time. SOLUTION: A max cool door 8 parallelly arranged on an air mix door 7 is formed as a butterfly type door, a cold air bypass passage 6 provided with the max cool door 8 is divided into an upper/lower cold air passage 6a/6b, in the downstream of the upper cold air passage 6a, a vent blow port 10 is arranged through a vent door 9, in the downstream of the lower cold air passage 6b, a foot blow port 12 is arranged through a foot door 11, in an air mix door lower side of the max cool door 8, a lower cold air amount limiting plate 13, limiting a lower cold air amount in a door opening region from door full closing to intermediate opening, is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an air conditioner unit in which a max cool door is arranged in parallel with an air mix door in order to increase the amount of cold air in the vent mode and to secure a vertical differential temperature in the bi-level mode. It belongs to the technical field of automobile air conditioners.

[0002]

2. Description of the Related Art Conventionally, an air conditioner for an automobile provided with an air conditioner unit in which a max cool door is arranged in parallel with an air mix door in order to increase the amount of cold air in the vent mode and to secure a vertical temperature difference in the bilevel mode. For example, the device shown in FIG. 8 is known (Shokai Sho 60-19).
1511).

In the air conditioner unit of this conventional apparatus, an air mix door is arranged in a cool air main passage and a cool cool bypass passage is arranged in a cool air main passage among cold air passages through which cool air passing through an evaporator arranged in a unit case passes. A heater core is arranged on the downstream side of the air mix door, and a vent outlet is arranged on the downstream side of the mac cool door via a vent door and a foot outlet is arranged on the foot door.

In the vent mode with the air mix door in the full cool position, the max cool door is fully opened to increase the amount of cold air from the vent outlet, and the opening degree of the air mix door is adjusted. In bi-level mode, the max cool door is fully opened to lower the vent outlet temperature from the vent outlet, ensuring a vertical temperature difference between the vent outlet temperature and the foot outlet temperature.

[0005]

However, in the above-described conventional air conditioner for automobiles, when the max cool door is opened, the cold air bypass passage is passed and the assist side (passenger side) is moved to the vent outlet. Most of the cool air is blown from the assist side vent port to the passenger compartment, and the air blown from the door side (driver's side) vent hole to the passenger compartment has a low amount of cool air and high temperature. Therefore, there is a problem that a difference in vent outlet temperature occurs between the assist side and the door side.

Therefore, in the bi-level mode in which a vertical temperature difference between the vent temperature and the foot temperature is secured, a large vertical temperature difference can be secured on the assist side, but the vertical temperature difference is reduced on the door side. Thus, the upper and lower temperature differentials tend to be biased.

Further, it is difficult to control the temperature of the air blown out from a plurality of vents arranged in the vehicle compartment, and it is difficult to control the temperature of the airflow. Since the tendency of the upper and lower temperature differences between the assist side and the door side is significantly increased, the cross-sectional area of the cold air bypass passage is set to a small area, and the function of increasing the cold air volume in the vent mode is suppressed to a small level.

As described above, although the air conditioner unit of the conventional automobile air conditioner has the max cool door set for the purpose of increasing the amount of cold air in the vent mode and ensuring the upper and lower differential temperatures in the bi-level mode, The passage cross-sectional area of the bypass passage is narrowed, and both the function of increasing the cool air volume and the function of ensuring the temperature difference between the upper and lower sides are achieved at a compromise level.

The problem to be solved by the present invention is to install an air conditioner unit in which a max cool door is arranged in parallel with an air mix door in order to increase the amount of cold air in the vent mode and to secure a vertical differential temperature in the bi-level mode. In an equipped vehicle air conditioner, a function of increasing the amount of cold air in the vent mode and a function of ensuring a vertical temperature difference in the bi-level mode are to be established at a high level.

[0010]

[Means for Solving the Problems]

(Solution 1) The means 1 for solving the above-mentioned problems (claim 1) is
An air mix door is placed in the cool air main passage of the cool air passages through which cool air that has passed through the evaporator placed in the unit case is placed, a max cool door is placed in the cold air bypass passage, and a heater core is provided downstream of the air mix door. Place the vent outlet through the vent door on the downstream side of the Max Cool door and the foot outlet through the foot door, and in the vent mode, open the Max Cool door to remove the vent from the vent outlet. Equipped with an air conditioner unit that increases the amount of cold air and lowers the vent outlet temperature from the vent outlet by opening the Max Cool door in the bi-level mode to ensure a vertical temperature difference between the vent outlet temperature and the foot outlet temperature. In the automotive air conditioning system, the air mix door and the Max Cool door are Max Cool A is an upper side and an air mix door is a lower side arranged in parallel, and the max cool door is a butterfly type door whose opening is controlled by rotation around a door support shaft provided in the central portion of the cold air bypass passage. The cold air bypass passage is divided into an upper cool air passage above the door support shaft of the Max Cool door and a lower cool air passage below the door support shaft, and a vent outlet is provided downstream of the upper cool air passage through a vent door. A foot outlet is arranged downstream of the lower cool air passage via a foot door, and the lower cool air is blown in the door opening range from the door fully closed to the intermediate opening at the lower side of the air mix door of Max Cool Door. It is characterized in that a lower cold air amount limiting member for limiting the amount is provided.

Therefore, in the solution means 1, the air mix door is set to the full cool position and the max cool door is set to the fully open position by the rotation about the door support shaft in the vent mode in which rapid vehicle interior cooling is desired. . With this door setting, as the cold air passage, the cold air bypass passage in which the max cool door is arranged is added to the cold air main passage in which the air mix door is arranged, that is, the cold air bypass passage in which the upper cold air passage and the lower cold air passage are combined. By adding the cross-sectional area to the cross-sectional area of the cold air passage, the amount of cold air from the vent outlet increases.

Further, in the bi-level mode in which it is desired to secure a differential temperature between the upper and lower sides, the opening degree of the air mix door is adjusted according to the set temperature, etc. Opened within the range where the lower cool air volume is limited. With this door setting, on the air mix door side, the cool air from the evaporator and the warm air that has passed through the heater core are mixed at the downstream position of the air mix door according to the opening of the air mix door, and this mixed air is passed through the foot door. Is blown out from the foot outlet. On the other hand, on the Max Cool door side, the lower cool air amount limiting member limits the lower cool air amount passing through the lower cool air passage, and only the upper cool air passing through the upper cool air passage uses the door surface of the Max cool door as the wind direction guide surface.
It is blown out toward a vent outlet arranged on the downstream side of the upper cold air passage.

That is, since the amount of lower cold air passing through the lower cold air passage is limited, the foot blowout temperature at the foot outlets located on the downstream side of the lower cool air passage changes with temperature due to the cold air passing through the Max Cool Door. Since the influence is suppressed, the temperature is kept almost constant. On the other hand, the vent blowing temperature is defined by the amount of cold air passing through the upper cold air passage, that is, the cross-sectional area of the upper cold air passage. Therefore, it is of course possible to secure a vertical differential temperature between the vent outlet temperature and the foot outlet temperature, and the optimum vertical differential temperature from a small vertical differential temperature to a large vertical differential temperature can be set by setting the door opening of the Max Cool Door. You can have the freedom to choose.

(Solution 2) Solution 2 for solving the above-mentioned problems (claim 2) is the air conditioner for an automobile according to claim 1, wherein the vent temperature and the foot temperature of the max cool door are different from each other. In the bi-level mode, the control range is the door opening area from the full closing of the door to the maximum door opening that can limit the lower cool air flow rate by the lower cool air flow rate limiting member, and the set vertical differential temperature or the target vertical differential temperature is set. Is provided with maxcool door opening control means for outputting an opening control command for increasing the door opening to the door actuator.

Therefore, in the solving means 2, in the bi-level mode in which the vent blow temperature and the foot blow temperature have a vertical difference temperature, the max cool door opening control means uses the lower cool air amount limiting member from the full closing of the door. The control range is the door opening area up to the maximum door opening that can limit the lower cool air volume.
An opening control command for increasing the door opening as the set vertical temperature difference or the target vertical temperature difference increases is output to the door actuator.

By this Max Cool Door opening control,
The upper / lower differential temperature can be set in response to the driver's or occupant's request, and bi-level control for determining the target upper / lower differential temperature according to the vehicle state, running state, etc. can be added as one of the air conditioning controls.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Embodiment 1 is an automobile air conditioner corresponding to solving means 1 and solving means 2.

First, the configuration will be described.

FIG. 1 is a sectional view showing an air conditioner unit of an automobile air conditioner according to a first embodiment, and FIG. 2 is an enlarged view showing a max cool door portion of the device according to the first embodiment.

In FIG. 1, 1 is a unit case, 2 is an evaporator, 3 is a heater core, 4 is an air inlet, 5 is a cold air main passage, 6 is a cold air bypass passage, 7 is an air mix door, 8 is a max cool door, 9 is a vent door,
10 is a vent outlet, 11 is a foot door, 12 is a foot outlet, 13 is a lower cold air amount limiting plate (lower cold air amount limiting member), 14 is a differential door, 15 is a door drive motor (door actuator), 16 is an auto amplifier ( Max-cool door opening control means) 17 is a vertical differential temperature setting dial.

The unit case 1 is a case in which an evaporator 2, a heater core 3 and various doors which constitute an air conditioner unit are provided, and various passages and blowout ports are integrally formed. The unit case 1 has an air inlet port. An evaporator 2 for cooling the introduced air from 4 is arranged, and an air mix door 7 is arranged in a cold air main passage 5 among cold air passages through which cold air passing through the evaporator 2 passes,
A max cool door 8 is arranged in the cold air bypass passage 6. A heater core 3 is arranged downstream of the air mix door 7. A vent outlet 10 is arranged downstream of the MacCool door 8 via a vent door 9 and a foot outlet 12 is arranged via a foot door 11.

The evaporator 2 receives the refrigerant of a low-pressure low-temperature atomized liquid that has passed through a compressor, a condenser, a liquid tank, and an expansion valve (not shown), takes away heat from the outside, evaporates, and returns the vaporized refrigerant again. It is an evaporator sent to a compressor.

The heater core 3 is a heat exchanger in which engine cooling water is passed through a circulation pump.

The air mix door 7 is a door for introducing a part of the cool air, which has passed through the evaporator 2 at an intermediate opening, to the heater core 3 and mixing the cool air and the warm air.

The max cool door 8 is provided to achieve the function of increasing the amount of cold air in the vent mode and the function of ensuring the temperature difference between the vent temperature and the foot temperature in the bi-level mode. It's a door.

The air mix door 7 and the max cool door 8 are arranged side by side in the vertical direction with the max cool door 8 above and the air mix door 7 below. The max-cool door 8 is a butterfly door whose opening is controlled by turning around a door support shaft 8a provided in the center of the cold air bypass passage 6,
Is divided into an upper cool air passage 6a above the door support shaft 8a of the Max Cool door 8 and a lower cool air passage 6b below the door support shaft 8a.

On the downstream side of the upper cold air passage 6a,
A vent outlet 10 is arranged via a vent door 9.

At the downstream side of the lower cold air passage 6b, a foot outlet 12 is arranged via a foot door 11.

At the lower part of the max cool door 8 on the air mix door 7 side, there is a lower cold air amount limiting plate 13 for limiting the lower cool air amount in the door opening region from the door fully closed to an intermediate opening (for example, about 45 degrees). Is provided, and the surface on the door side of the lower cool air amount limiting plate 13 is an arc surface 13a having a radius centered on the door support shaft 8a so as to maintain a constant gap with the tip surface of the Max Cool door 8, A fully closed stopper protrusion 13b is formed at the fully closed side end of the amount limiting plate 13.

Door support shaft 8a of the Max Cool door 8
2, is connected to a motor shaft of a door drive motor 15 that rotationally drives the Max Cool door 8, and the door drive motor 15 is drive-controlled according to a drive command from the auto amplifier 16.

In the vent mode, the auto amplifier 16 opens the max cool door 8 in the fully open position (position shown in FIG. 2) when the temperature inside the vehicle is below the set temperature even though the air mix door 7 is in the full cool position. ) Is output. Further, in the bi-level mode in which the vent outlet temperature and the foot outlet temperature have a vertical differential temperature, if the vertical differential temperature setting dial 17 is set to a position with a small differential temperature, the max cool door 8 is in the fully closed position (Fig. 2 position) and outputs a drive command to set the max cool door 8 to an intermediate opening position (position in FIG. 2) when the position in the differential temperature is selected by the upper / lower differential temperature setting dial 17. When a position with a large temperature difference is selected by the upper / lower temperature difference setting dial 17, a drive command for outputting the max cool door 8 to the maximum door opening position (position in FIG. 2) that can limit the lower cool air volume is output. To do.

Next, the operation will be described.

[Vent Mode] In the vent mode, when the vehicle interior temperature does not reach the set temperature and rapid cooling of the vehicle interior is desired even when the air mix door 7 is at the full cool position, the auto amplifier is used. In response to a drive command from 16, the Max Cool door 8 is brought to the fully open position (position in FIG. 2) by rotation around the door support shaft 8a.

With this door setting, as shown in FIG.
As a cold air passage, a cold air bypass passage 5 in which a max cool door 8 is arranged is added to a cold air main passage 5 in which an air mix door 7 is arranged, that is, a cold air bypass in which an upper cold air passage 5a and a lower cold air passage 5b are combined. By adding the passage cross-sectional area to the cold air passage cross-sectional area, the amount of cold air from the vent outlet 10 increases.

As described above, almost the entire cross-sectional area of the cold air bypass passage 6 whose passage cross-sectional area is set wide is an expanded cross-sectional area as a cold air passage, and a high function of increasing the cold air volume can be exerted in the vent mode.

[In bi-level mode] In the bi-level mode in which it is desired to secure a temperature difference between the upper and lower sides, the opening degree of the air mix door 7 is adjusted in accordance with the set temperature and the like, and the max cool door 8 is provided below the air mix door 7. The lower cold air amount limiting plate 13 controls the door opening in three steps within the range where the lower cold air amount is limited. In this bi-level mode, the foot outlet temperature characteristic and the vent outlet temperature characteristic when the opening degree of the air mix door 7 is changed are shown in FIG.
The characteristics shown in FIG.

Here, in an example in which the air mix door 7 is fixed at an intermediate opening degree, when the temperature difference is set to a small value so that the max cool door 8 is at the position shown in FIG. 2 and the max cool door 8 is at the position shown in FIG. The operation will be described separately for the setting during the differential temperature setting and the setting for the large differential temperature setting the max cool door 8 at the position shown in FIG.

(When the small differential temperature is set) When the small differential temperature is set, as shown in FIG.
The door settings are shown in.

With this door setting, the air mix door 7
The cool air that has passed through the lower cool air main passage 5 becomes warm air as it passes through the heater core 3, and this warm air and the cool air that has passed through the cool air main passage 5 above the air mix door 7 form the air mix door 7. The heater core side mixed air having a large influence of warm air is blown out from the foot outlet 12 via the foot door 11, and the air mix door side mixed air having a large influence of cold air is emitted from the vent outlet 10 via the vent door 9 at the downstream position. Blown out.

Since the max cool door 8 is fully closed, there is no inflow of cold air from the cold air bypass passage 6.

Therefore, the upper and lower temperature difference between the vent outlet temperature and the foot outlet temperature is determined only by the opening degree of the air mix door 7,
As shown in FIG. 4, at the intermediate opening position of the air mix door 7, the smallest vertical temperature difference ΔT1 can be secured.

(During differential temperature setting) When the differential temperature is set, FIG.
The door settings are shown in.

With this door setting, the air mix door 7
The cool air that has passed through the lower cool air main passage 5 becomes warm air as it passes through the heater core 3, and this warm air and the cool air that has passed through the cool air main passage 5 above the air mix door 7 form the air mix door 7. The heater core side mixed air that is mixed at the downstream position and has a large influence of warm air is blown from the foot outlet 12 through the foot door 11, and the air mix door side mixed air that has a large influence of cold air is blown toward the vent outlet 10. .

On the other hand, on the side of the Max cool door 8, the lower cool air amount limiting plate 13 limits the lower cool air amount passing through the lower cool air passage 6 and only the upper cool air passing through the upper cool air passage 6a is exposed on the door surface of the max cool door 8. Is used as a wind guide surface and is blown toward a vent outlet 10 arranged on the downstream side of the upper cold air passage 6.

That is, since the amount of lower cold air passing through the lower cool air passage 6b is limited, the foot outlet temperature at the foot outlet 12 arranged on the downstream side of the lower cool air passage 6b passes through the Max Cool door 8. Since the influence of temperature change due to cold air is suppressed, the temperature can be maintained at a substantially constant temperature that is the same as when the max cool door 8 is fully closed.

On the other hand, the vent blow-out temperature is such that the temperature of the mixed air on the air mix door side, which has a great influence on the cold air, decreases according to the amount of cold air passing through the upper cold air passage 6, that is, the size of the upper cold air passage cross-sectional area. The temperature is specified by.

Therefore, the upper and lower temperature difference between the vent blowout temperature and the foot blowout temperature is as shown in FIG. The temperature difference ΔT2 can be secured at the degree position.

(When the large differential temperature is set) When the large differential temperature is set, FIG.
The door settings are shown in.

With this door setting, the upper cold air passage 6
Except for the point that the amount of cold air passing through is larger than that when the temperature difference is set, it exhibits the same operation as when the temperature difference is set.

Therefore, the upper and lower temperature difference between the vent outlet temperature and the foot outlet temperature is as shown in FIG. 4 because the door opening of the MaxCool door 8 is the maximum opening that can limit the lower cool air volume.
As shown in FIG. 5, the upper and lower temperature difference ΔT3 can be secured at the intermediate opening position of the air mix door 7.

That is, the hatched portion of the blow-out temperature characteristic shown in FIG. 4 is the upper / lower differential temperature adjustment region which can be changed by setting the door opening of the Max Cool door 8, and the Mack is gradually changed as described above. By controlling the door opening of the school door 8 or by controlling the door opening of the Max Cool door 8 steplessly, the optimum vertical differential temperature can be selected from a small vertical differential temperature to a large vertical differential temperature. You will have the freedom to do so.

Next, the effects will be described.

(1) The air mix door 7 and the max cool door 8 are arranged side by side vertically with the max cool door 8 above and the air mix door 7 below, and the max cool door 8 is located at the center of the cold air bypass passage 6. Is a butterfly-type door whose opening is controlled by rotation around a door support shaft 8a provided in the cold air bypass passage 6, and the cool air bypass passage 6 is provided with an upper cool air passage 6a above the door support shaft 8a of the max cool door 8.
And a lower cold air passage 6b below the door support shaft 8a,
A vent outlet 10 is arranged on the downstream side of the upper cold air passage 6a via the vent door 9, and a foot outlet 12 is arranged on the downstream side of the lower cold air passage 6b via a foot door 11.
In the lower part of the air mix door of Max Cool Door 8,
Since the lower cold air amount limiting plate 13 for limiting the lower cold air amount in the door opening region from the door fully closed to the intermediate opening is provided,
The function of increasing the amount of cold air in the vent mode and the function of ensuring the vertical temperature difference in the bi-level mode can be established at a high level.

(2) In the bi-level mode, if a position having a small temperature difference is selected by the upper / lower temperature difference setting dial 17, a drive command for setting the max cool door 8 to the fully closed position is output, and the upper / lower temperature difference setting dial. When the position in the differential temperature is selected by 17, the drive command for setting the max cool door 8 to the intermediate opening position is output, and when the position of the large differential temperature is selected by the vertical differential temperature setting dial 17, the max cool is selected. Since the auto-amplifier 16 that outputs the drive command for setting the door 8 to the maximum door opening position that can limit the lower cool air volume is provided, the maximum cool door opening control allows the vertical differential temperature state to meet the driver's and occupant's requirements. Can be set.

(Other Embodiments) In the first embodiment, an example in which the upper / lower differential temperature setting dial 17 is used to set the upper / lower differential temperature according to the driver's or occupant's demands by controlling the MaxCool door opening degree. Although shown, the target top-bottom differential temperature may be determined according to the vehicle state, the traveling state, etc., and the max-cool door opening control for obtaining the determined target top-bottom differential temperature may be performed. Further, the max cool door opening control may be stepwise control as shown in the first embodiment,
Alternatively, stepless control may be used.

[0056]

According to the first aspect of the present invention, the max cool door is arranged in parallel with the air mix door in order to increase the amount of cold air in the vent mode and to secure the vertical temperature difference in the bi-level mode. In an automotive air conditioner equipped with an air conditioner unit, the air mix door and the max cool door are arranged side by side with the max cool door above and the air mix door below, and the max cool door is located in the center of the cold air bypass passage. A butterfly-type door whose opening is controlled by rotation around the provided door support shaft,
The cool air bypass passage is divided into an upper cool air passage above the door support shaft of the Max Cool Door and a lower cool air passage below the door support shaft, and a vent outlet is arranged on the downstream side of the upper cool air passage through a vent door. A foot outlet is arranged via a foot door on the downstream side of the lower cool air passage, and the lower cool air volume is limited in the door opening area from the door fully closed to the intermediate opening at the lower part of the air mix door of Max Cool Door. Since the lower cool air flow rate limiting member is provided, it is possible to obtain the effect that the function of increasing the cool air flow rate in the vent mode and the function of ensuring the vertical temperature difference in the bi-level mode can be achieved at a high level.

According to the second aspect of the present invention, the first aspect is provided.
In the vehicle air conditioner described, in the max cool door, the door opening area from the fully closed door to the maximum door opening that can limit the lower cool air quantity by the lower cool air quantity restricting member is the control range, and the set vertical differential temperature Alternatively, in addition to the above effect, in response to the driver and occupant's demand, in addition to the above effect, since the maximum cool door opening control means for outputting an opening control command to the door actuator to increase the door opening as the target temperature difference is increased, or It is possible to automatically control the setting of the temperature difference between the upper and lower sides according to the vehicle state, the running state, and the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an air conditioner unit of an automobile air conditioner according to a first embodiment.

FIG. 2 is a partially enlarged view showing a Max Cool door portion of the automobile air conditioner of the first embodiment.

FIG. 3 is an operation explanatory view in a vent mode in which the max-cool door is fully opened in the vehicle air conditioner of the first embodiment.

FIG. 4 is a blowout temperature characteristic diagram with respect to the air mix door opening when the door opening of the Max Cool door is changed in the bi-level mode in the automobile air conditioner of the first embodiment.

FIG. 5 is an explanatory view of the operation when the small vertical difference temperature is selected in the bi-level mode in the automobile air conditioner of the first embodiment.

FIG. 6 is an operation explanatory diagram when the upper / lower differential temperature is selected in the bi-level mode in the vehicle air conditioner of the first embodiment.

FIG. 7 is an operation explanatory diagram when the upper / lower temperature difference is selected in the bilevel mode in the vehicle air conditioner of the first embodiment.

FIG. 8 is a cross-sectional view showing an air conditioner unit of a conventional automobile air conditioner.

[Explanation of symbols]

1 Unit Case 2 Evaporator 3 Heater Core 4 Air Inlet 5 Cold Air Main Passage 6 Cold Air Bypass Passage 6a Upper Cold Air Passage 6b Lower Cold Air Passage 7 Air Mix Door 8 Max Cool Door 8a Door Spindle 9 Vent Door 10 Bent Air Outlet 11 Foot Door 12 Foot Blow Outlet 13 Lower cold air flow rate limiting plate (lower cold air flow rate limiting member) 14 Differential door 15 Door drive motor (door actuator) 16 Auto amplifier (Maxcool door opening control means) 17 Vertical differential temperature setting dial

Claims (2)

[Claims] 1. An air mix door (7) is arranged in a cool air main passage (5) among cold air passages through which cool air has passed through an evaporator (2) arranged in a unit case (1), and a cold air bypass passage (6). ), A max cool door (8) is arranged, a heater core (3) is arranged downstream of the air mix door (7), and a vent door (9) is arranged downstream of the max cool door (8). The vent outlet (10) and the foot outlet (12) via the foot door (11). In the vent mode, the max cool door (8) is opened to remove the vent outlet (10). By increasing the amount of cool air and opening the max cool door (8) in the bi-level mode, the vent outlet temperature from the vent outlet can be lowered, and the upper and lower temperature difference between the vent outlet temperature and the foot outlet temperature can be reduced. A vehicle air conditioner having an air conditioner unit for maintaining the air mix door (7) and the max cool door (8), wherein the max cool door (8) is on the upper side and the air mix door (7) is on the lower side. And the max-cool door (8) is a butterfly door whose opening is controlled by turning around a door support shaft (8a) provided in the center of the cold air bypass passage (6). The bypass passage (6) is divided into an upper cool air passage (6a) above the door support shaft (8a) of the Max Cool door (8) and a lower cool air passage (6b) below the door support shaft (8a), A vent outlet (10) is arranged downstream of the upper cool air passage (6a) via a vent door (9), and a foot blower (11) is arranged downstream of the lower cold air passage (6b) through a foot door (11). The mouth (12) is arranged, and the lower cool air amount restricting member (13) for restricting the lower cool air amount in the door opening area from the door fully closed to the intermediate opening is provided on the lower side of the Max Cool door (8) on the air mix door side. ) Is provided. 2. The air conditioner for an automobile according to claim 1, wherein the maximum cool door (8) has a maximum door opening degree capable of limiting a lower cool air amount by a lower cool air amount limiting member (13) from a fully closed state of the door. The door actuator (15) outputs an opening control command for increasing the door opening as the set upper / lower differential temperature increases or the target upper / lower differential temperature increases.
An air conditioner for an automobile, characterized in that it is provided with a Maxcool door opening control means (16) for outputting to.