JPH068724A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To adjust a blow temperature through a specified blow out duct while increasing blow rate from the specified blowout duct in quick cooling in an air conditioner for sending air conditioning air from an air conditioning duct into a cabin through a plurality of blowout ducts. CONSTITUTION:An evaporator 27 and heater core 28 are disposed in a main path 34 provided in an air conditioning duct 21, and a first bypass path 34 is formed to bypass the heater core 28. Blow rate passing through the heater core 28 is adjusted by an air mix damper 30. A second bypass path 35 is formed by a partition wall 33. Cool air passing through the second bypass path 35 has the blow rate adjusted by a cool air damper 36 and is mixed with air conditioning air from the main path 34. In quick cooling, a path changing-over damper 54 provided on the partition wall 33 opens a communicating path 53, so that the cool air passing through the first bypass path 34 flows into the second bypass path 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle, which blows the conditioned air generated by an air conditioning duct into a vehicle through a plurality of blowing ducts.

[0002]

2. Description of the Related Art Conventionally, as a vehicle air conditioner,
In the bi-level mode, warm air-conditioned air is blown to the passengers' feet and air-conditioned air at a temperature slightly lower than the air-conditioned air temperature is blown to the upper half of the body to provide comfortable ventilation of head cold foot heat. There is.

As an example of this type of air conditioner, Jitsuko Sho 5
7-28653, and its configuration is shown in FIG. That is, the evaporator 2 and the heater core 3 are arranged in the air conditioning duct 1, and the air supplied into the air conditioning duct 1 is cooled by passing through the evaporator 2. The amount of cold air passing through the heater core 3 is adjusted by the air mix damper 4, and the evaporator 2 is adjusted according to the adjustment.
The proportion of the cold air from which the air is warmed by passing through the heater core 3 is determined, and thus the temperature-controlled conditioned air is blown from the air conditioning duct 1.

The air conditioning duct 1 includes a foot blowout duct 5 for blowing air to the feet of the front and rear seats, a defroster blowout duct 6 for blowing air to the windshield, and a face blowout duct 7 for blowing air to the upper half of the occupant's body. It is connected. Foot outlet duct 5 and defroster outlet duct 6
The dampers 8 and 9 for adjusting the air volume are provided corresponding to the above, and the passage switching damper 10 for switching the defroster blowout duct 6 and the face blowout duct 7 is provided.

On the other hand, in the air conditioning duct 1, the downstream side of the evaporator 2 and the face outlet duct 7 are connected by a bypass duct 11, and the bypass duct 11 is opened and closed by a cold air damper 12. In this case, each of the dampers is opened / closed in conjunction with the mode switching lever.

Now, when the cooling operation is set by the mode switching lever, only the face blowing duct 7 is opened, so that all the conditioned air whose temperature is adjusted by the air mix damper 4 is blown into the vehicle through the face blowing duct 7.

When the bi-level mode is set by the mode switching lever, the foot outlet duct 5 opens and the face outlet duct 7 opens, so that the conditioned air whose temperature is adjusted by the air mix damper 4 is released in the foot outlet duct. The air is blown into the vehicle through the 5 and the face outlet duct 7. At this time, the bypass duct 11
Since part of the cool air that has passed through the evaporator 2 is also supplied to the face outlet duct 7 through the bypass duct 11, the temperature of the air blown to the upper body of the occupant is slightly lower than the temperature of the air blown to the feet. A comfortable ventilation environment for cold feet can be realized.

[0008]

By the way, in recent years, there has been a demand for arbitrarily setting the temperature of air blown through the face blowing duct 7 in the bilevel mode. However, in the case of the above-mentioned conventional configuration, in the bi-level mode, the temperature of the air blown from the face outlet duct 7 is uniformly set to a temperature slightly lower than the temperature of the conditioned air whose temperature is adjusted by the air mix damper 4. Will end up. For this reason, the temperature of the air blown through the face blowout duct 7 cannot be set independently of the temperature of the air blown to the feet, and that point remains as an unsolved problem.

During the rapid cooling operation, the foot blow duct 5 and the defroster blow duct 6 are closed to blow all the cool air from the evaporator 2 into the vehicle through the face blow duct 7, but the air conditioning duct 1 And the face outlet duct 7 are connected so as to be substantially orthogonal to each other, the air blowing resistance during the rapid cooling operation is extremely large, and it is difficult to increase the amount of air blown through the face outlet duct 7.

The present invention has been made in view of the above circumstances, and an object thereof is to blow the conditioned air from the air-conditioning duct through a plurality of air-blowing ducts into the vehicle to arbitrarily adjust the air-blowing temperature through a specific air-blowing duct. (EN) It is possible to provide a vehicle air conditioner capable of increasing the amount of air blown through a specific blowout duct during a rapid cooling operation.

[0011]

According to the present invention, a heater is arranged so that a first bypass passage is formed in a main passage provided in an air conditioning duct, and cool air is blown from the blower means to the main passage. In a vehicle air conditioner that blows conditioned air into a vehicle through a plurality of outlet ducts connected to a main passage by adjusting the amount of cool air that passes through a heater by a temperature adjusting means, the first bypass passage is provided. A second bypass passage is provided for allowing the passing cool air to flow into a specific blowout duct of the plurality of blowout ducts, and a cold wind damper is provided for adjusting the amount of blown air passing through the second bypass passage. A communication passage is provided for allowing cool air passing through the first bypass passage to flow into the second bypass passage, and a passage switching damper is provided for opening the communication passage. Thereby adjusting the amount of air passing through by,
A control device is provided for opening the communication passage by the passage switching damper when the rapid cooling operation is instructed.

[0012]

The cool air from the blowing means passes through the main passage provided in the air conditioning duct. At this time, since the amount of cold air passing through the heater is adjusted by the temperature adjusting means, the warm air warmed by passing through the heater and the cold air passing through the first bypass passage are mixed. Therefore, the conditioned air is blown into the vehicle through the outlet duct connected to the main passage.

On the other hand, the amount of cold air passing through the second bypass passage is set by the opening degree of the cold air damper. As a result, the amount of cold air that flows into the specific outlet duct through the second bypass passage is adjusted.

When the rapid cooling operation is instructed, the control device opens the communication passage by the passage switching damper. As a result, the cool air passing through the first bypass passage flows into the specific blowing duct through the communication passage, so that the amount of air blown from the specific blowing duct can be increased.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the overall schematic configuration. In FIG. 1, a blower fan 22 is provided at the start end of the air conditioning duct 21, and an inside / outside switching damper 23 is provided.
The air inside the vehicle or the air outside the vehicle passes through the main passage 3 provided in the air conditioning duct 21 by the blower fan 22.
4 is supplied. The blower fan 22 is driven by a motor control circuit 24, and the damper 23 is opened and closed by a servo motor 25. Then, the motor control circuit 2
The operation of the servo motor 4 and the servo motor 25 is controlled by a control unit (ECU) 26.

An evaporator 27 and a heater core 28 as a heater are arranged in the main passage 34. The evaporator 27 is supplied with a refrigerant from a compressor (not shown), and the heater core 28 is supplied with engine cooling water through a water valve 29. The size of the heater core 28 is set so as to occupy approximately half of the cross-sectional area of the main passage 34, whereby a first bypass passage 34a separated from the heater core 28 is formed in the main passage 34.

An air mix damper 30 serving as a temperature adjusting means is provided corresponding to the heater core 28, and the amount of cold air passing through the heater core 28 is set according to the opening degree of the air mix damper 30. This air mix damper 3
The opening degree of 0 is adjusted by the servo motor 31, and the operation of the servo motor 31 is controlled by the controller 26. Further, a temperature sensor 32 is arranged downstream of the evaporator 27, and a temperature signal from the temperature sensor 32 is given to the control device 26.

In the main passage 34, the evaporator 27
A partition 33 is provided on the downstream side of the partition 33.
Thus, the second bypass passage 35 is formed. Here, the second bypass passage 35 is opened / closed by a cold air damper 36, and the cold air damper 36 causes the servo motor 3 to move.
The opening degree is adjusted by the operation of 7. The operation of the servo motor 37 is controlled by the controller 26.

A defroster blowout duct 38, a foot blowout duct 39 and a face blowout duct 40 as a specific blowout duct are connected to the main passage 34. in this case,
The face outlet duct 40 is connected in a direction orthogonal to the direction of air blown from the main passage 34. Further, the blowout ducts 38 and 39 are opened and closed by the dampers 41 and 42, and the air passage extending from the main passage 34 to the face blowout duct 40 is opened and closed by the damper 43. The opening degree of these dampers 41, 42, 43 is adjusted by a servomotor 44. And the servo motor 4
The operation of 4 is controlled by the control device 26.

An air outlet 45 is provided at the end of the face air outlet duct 40, and an air volume adjusting damper 46 is provided corresponding to the air outlet 45. The opening of the air volume adjusting damper 46 is adjusted by a servo motor 47. The operation of the servo motor 47 is controlled by the controller 26.

Now, the control device 26 includes the indoor temperature sensor 4
By inputting each detection signal from 8, the outside air temperature sensor 49, the solar radiation sensor 50, the cooling water temperature sensor 51, and the set temperature from the temperature setting switch 52,
It controls each servo motor.

FIG. 2 is a partial perspective view of the air conditioning duct 21, and FIG. 3 is a cross sectional view of the bypass passage 35. 2 and 3, the bypass passage 35 is formed in a U shape so as to have a pair of opposed arm portions 35a and 35b, and the main passage 3 is formed between the arm portions 35a and 35b.
The conditioned air from 4 passes and is blown to the face blowout duct 40. Here, the bypass passage 35
A plurality of cutouts 35c are formed in the arm portions 35a, 35b of the base 35, and the bypass passage 35 communicates with the air passage through the cutouts 35c.

The partition 33 has a rectangular communication passage 53.
Is formed, and a passage switching damper 54 is provided in the communication passage 53. The passage switching damper 54 is rotated by the servomotor 31, and closes the communication passage 53 at the closed position and opens the communication passage 53 at the open position.

Next, the operation of the above configuration will be described. When the outside temperature is relatively low and the sunlight is strong, such as in spring and autumn, warm air is blown to the feet of the occupants and cold air is blown to the upper half of the occupants who are exposed to the sunlight, creating a head cold foot heat blowing environment. It is desirable to do. Therefore, when the bi-level mode is set by the mode switching lever, the control device 26
Controls each servo motor to open the foot blowout duct 39 and the face blowout duct 40, and drives the blower fan 22 according to the set blowing strength. As a result, the air blown from the blower fan 22 is cooled by the evaporator 27, and most of the air is blown to the main passage 34, while the rest is blown to the second bypass passage 3
Is blown to 5.

The cold air blown to the main passage 34 is warmed by a part of it passing through the heater core 28 according to the opening degree of the air mix damper 30, and the rest passes through the first bypass passage 34a. Air-conditioned air whose temperature is controlled is sent from the main passage 34 according to the opening degree of the air mix damper 30. Then, the air-conditioning air whose temperature has been adjusted in this way is blown into the vehicle through the foot blowing duct 39 and the face blowing duct 40.

On the other hand, the controller 26 adjusts the opening degree of the cold air damper 36 according to the temperature setting, and the cold air having the air volume corresponding to the opening degree passes through the second bypass passage 35. As a result, a predetermined amount of cold air is blown from the cutout portion 35c of the second bypass passage 35 to the air passage extending from the main passage 34 to the face blowout duct 40. At this time, since the temperature-controlled air-conditioning air is blown from the main passage 34 to the air-blowing path, the cold air blown from the bypass passage 35 mixes with the air-conditioning air and is blown into the vehicle through the face blow-out duct 40. . Therefore, the face outlet duct 40
The temperature of the conditioned air that is blown into the vehicle through the vehicle is lower than the temperature of the conditioned air that is passed through the foot outlet duct 39.

Here, the line segment x in FIG. 4 shows the change in the temperature of the conditioned air passing through the main passage 34 with respect to the opening degree of the air mix damper 30, and the line segment y shows when the opening degree of the cold air damper 36 is 100%. The change in the face outlet temperature with respect to the opening degree of the air mix damper 30 is shown, and the line segment z shows the change in the face outlet temperature with respect to the opening degree of the air mix damper 30 when the opening degree of the cold air damper 36 is 50%. At this time, in the line segment x, the opening degree of the cold air damper 36 is 0%.
At this time, the temperature of the face blowout with respect to the opening of the air mix damper 30 substantially matches. The temperature TE indicates the temperature of the cold air from the evaporator 27.

As can be seen from FIG. 4, as the opening of the air mix damper 30 increases, the temperature of the conditioned air increases, and as the opening of the cold air damper 36 increases, the face outlet temperature generally decreases. In this case, the face air conditioning temperature at a predetermined angle of the air mix damper 30 can be set within a predetermined range shown by the shaded area below the air conditioning air temperature according to the opening degree of the cold air damper 36. That is, the air-conditioning wind temperature and the face outlet temperature when the opening degree of the cold air damper 36 is 0 ° and when the opening angle is a predetermined angle are the air mix damper 3
Since the ratio is constant regardless of the opening degree of 0, the air-conditioning air set temperature and the face outlet set temperature are controlled by the controller 26.
The control device 26 determines the opening degrees of the air mix damper 30 and the cold air damper 36 from the relationship shown in FIG. To do. As a result,
Since the opening degree of the damper 36 is adjusted according to the opening degree of the air mix damper 30, the face outlet temperature through the face outlet duct 40 can be adjusted to a target value.

When the rapid cooling operation is set by the mode switching lever, the control device 26 closes the defroster blowout duct 38 and the foot blowout duct 39 and opens the face blowout duct 40. In addition, the control device 26
Causes the blower fan 22 to rotate at the maximum speed with the air mix damper 30 moved to the closed position and the passage switching damper 54 moved to the open position. As a result, the cool air cooled by the evaporator 27 by passing through the main passage 34 is blown into the vehicle through the face blowout duct 40. At this time, since the passage switching damper 54 is located at the open position, most of the cool air passing through the first bypass passage 34a is connected to the communication passage 5 by the passage switching damper 54.
While flowing into the second bypass passage 35 through 3,
The air is blown into the vehicle through the face outlet duct 40.

According to the above configuration, the evaporator 2
A part of the cool air from 7 is blown to the second bypass passage 35, and the amount of the blown air is adjusted by the cool air damper 36. Therefore, in the bi-level mode, a predetermined amount of cool air is passed through the bypass duct to the face blowing duct. Unlike the conventional configuration in which only the air is supplied, the temperature of the air blown into the vehicle through the face air outlet duct 40 can be adjusted to a predetermined temperature equal to or lower than the temperature of the conditioned air that has passed through the main passage 34.

Further, in the case of the above-described embodiment, during the rapid cooling operation, the passage switching damper 54 provided in the partition wall 33 is switched to the open position so that the cool air passing through the first bypass passage 34a can be cooled. Therefore, the first bypass passage 34a is connected to the communication passage 53.
Through to the second bypass passage 35. Therefore, in order to supply the conditioned air from the air conditioning duct to the face air outlet, unlike the conventional configuration in which the air blowing direction must be bent in the orthogonal direction, the air blowing resistance to the face air outlet duct 40 can be reduced. Therefore, the amount of air blown into the vehicle through the face air outlet duct 40 can be increased.

Further, in the case of the above-described embodiment, since the cool air is blown from the cutout portions 35c formed in the arm portions 35a and 35b of the bypass passage 35, the cool air from the bypass passage 35 is temperature-controlled conditioned air. Will be supplied in a direction orthogonal to the air blowing direction. Therefore, since the cool air is efficiently mixed with the conditioned air, the face blowing temperature through the face blowing duct 40 matches the target temperature well.

FIGS. 6 and 7 show a second embodiment of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Only different parts will be described. That is,
The auxiliary communication passage 53a is provided at positions on both sides of the communication passage 53 in the arms 35a and 35b of the second bypass passage 35.
Are formed respectively. Further, auxiliary passage switching dampers 54a are integrally provided on both sides of the passage switching damper 54, and the auxiliary communication passages 53a are opened and closed according to the positions of the auxiliary passage switching dampers 54a. .

In the case of the second embodiment, when the passage switching damper 54 is moved to the open position due to the setting of the rapid cooling operation, the auxiliary passage switching damper 54a is also moved to the open position. At the same time as the opening, the auxiliary communication passage 53a is also opened. Therefore, the cold air passing through the first bypass passage 34a flows into the second bypass passage 35 from the auxiliary communication passage 53a in addition to the communication passage 53, so that the rapid cooling is faster than that in the first embodiment. It is possible to further increase the amount of cool air blown into the vehicle through the face outlet duct 40 during operation.

Moreover, as described above, since the amount of cool air blown during the rapid cooling operation can be increased by bypassing the main passage 34, the amount of cool air can be increased regardless of the length or shape of the main passage 34. be able to. Therefore, the air conditioning duct 21 can be efficiently arranged within the limited space of the vehicle.

In each of the above embodiments, the bypass passage 35 is used.
Although the two arm portions 35a and 35b are provided in the above, the bypass passage 35 may be configured to have one arm portion instead.

The arms 35a, 3 of the bypass passage 35 are also provided.
The size and the number of the cutouts 35c formed in 5b can be set appropriately.

[0038]

As is apparent from the above description, the vehicle air conditioner of the present invention has the following effects.

The heater is formed so that the first bypass passage is formed in the main passage provided in the air conditioning duct, and the amount of cold air from the blower passing through the heater is adjusted by the temperature adjusting means. Therefore, when blowing air from the air conditioning duct into the vehicle through multiple outlet ducts,
The temperature of the air blown through the specific blowing duct can be adjusted arbitrarily.

Further, a second bypass passage and a communication passage are provided for allowing the cool air passing through the first bypass passage to flow into a specific blow-out duct, and when the rapid cooling operation is instructed, the passage switching damper is used for communication. Since the cool air passing through the first bypass passage is made to flow into the specially-designed duct through the second bypass passage by opening the passage, it is possible to increase the amount of air blown through the specific blowing duct during the rapid cooling operation. it can.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic perspective view showing an air conditioning duct in a broken manner.

FIG. 3 is a cross-sectional view of the bypass passage.

FIG. 4 is a diagram showing a change in air conditioning air temperature with respect to an opening degree of an air mix damper.

FIG. 5 is a diagram showing an opening of a damper with respect to temperature setting.

FIG. 6 is a view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 7 is a view corresponding to FIG.

FIG. 8 is a view corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

21 is an air conditioning duct, 26 is a control device, 28 is a heater core (heater), 30 is an air mix damper (temperature adjusting means), 34 is a main passage, 34a is a first bypass passage, 35 is a second bypass passage, 36 is a cold wind damper, 3
8 is a defroster outlet duct, 39 is a foot outlet duct,
40 is a face outlet duct (specific outlet duct), 53
Is a communication passage, and 54 is a passage switching damper.

Claims (1)

[Claims] 1. A heater is arranged so that a first bypass passage is formed in a main passage provided in an air conditioning duct, and cool air is blown from the blower means to the main passage and the heater passes through the heater. In a vehicle air conditioner that blows conditioned air into the vehicle through a plurality of outlet ducts connected to a main passage by adjusting the amount of cool air to be controlled by a temperature adjusting means, the cool air that passes through the first bypass passage is A second bypass passage for flowing into a specific one of the outlet ducts, a cool air damper for adjusting the amount of air blown through the second bypass passage, and a cool air passage for passing the first bypass passage in an open state. And a passage switching damper that opens the communication passage, and adjusts a passing air volume by the cold air damper, Fast vehicle air conditioner when the cooling operation is instructed, characterized in that a control device for opening the communication passage by the path switching damper.