JPH10338019A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an air conditioning unit so as to simplify its structure by using a hot air bypass door, by which hot air is directly bypassed to a foot opening part side in a maximum heating time, as a movable partition member for an air passage at the same time. SOLUTION: A hot air bypass door 22 is operated toward the vicinity of a partition line for a heater core 13 when a maximum heating condition is set in a foot blowing mode and a defroster blowing mode, that is, when a two- laminar flow mode is set In this case, the hot air bypass door 22 serves as a movable partition member dividing the first hot air passage 19a right behind the heater core 13 into the first air passage 8 and the second air passage 9. In this way, the hot air bypass door 22 itself can works as the movable partition member for inside/outside air, so that an installation area for a fixed partition member can be reduced, and miniaturization of an air conditioning unit and simplification of its structure can be accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a passage of air-conditioned air into a first air passage on the inside air side and a second air passage on the outside air side, so that the high temperature inside air warmed from the foot outlet is formed. The present invention relates to an air conditioner for a vehicle that recirculates and blows out air while blowing out low-humidity outside air from a defroster outlet to achieve both improvement in heating capacity and anti-fog property of window glass.

[0002]

2. Description of the Related Art As a prior art of such a vehicle air conditioner, there is one disclosed in Japanese Patent Application Laid-Open No. 5-124426. To explain the outline of this prior art, an air conditioning case of a vehicle air conditioner has an inside air intake port and an outside air intake port formed at one end side, and a foot outlet, a defroster outlet, and a face outlet at the other end side. Each is formed.

In the air conditioning case, a first air passage extending from the inside air inlet to the face outlet and the foot outlet, and a second air passage extending from the outside air inlet to the defroster outlet are defined. A partition plate to be formed is provided. Further, a heating heat exchanger, a bypass passage that bypasses the heating heat exchanger, and an air mixing door are provided in the air passages. In the air mix door, a door on the first air passage side and a door on the second air passage side are integrally provided on one rotating shaft rotatably provided over both the air passages. It has a configuration.

When one of the face mode, the bi-level mode, and the foot mode is selected as the blowing mode, if the inside / outside air mode at that time is the inside air circulating mode, the inside air is introduced into the two air passages. Introduce,
In the outside air introduction mode, outside air is introduced into both air passages. When the defroster mode is selected as the blowing mode, outside air is introduced into both air passages.

Further, when the foot defroster mode is selected as the blowing mode, a two-layer flow 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, already warmed inside air can be blown out from the foot outlet to heat the vehicle interior, so that the heating performance can be improved. At the same time, low-humidity outside air is blown out to the window glass from the defroster outlet,
The anti-fog performance of the window glass can be secured.

[0006]

In recent years, in a vehicle air conditioner, it has been a major problem to reduce the size and simplification of the configuration of an air conditioning unit mounted in a vehicle cabin due to space restrictions and cost restrictions in mounting the vehicle. Has become. However, in the above-described conventional technology, the first air conditioning unit has the first
It is necessary to additionally install a partition plate that separates the air passage and the second air passage, which leads to a complicated configuration, raises costs, and has a physique to avoid interference between the partition plate and doors. It becomes large.

In view of the above, the present invention provides a vehicle air conditioner capable of setting an inside / outside air two-layer mode in which inside air and outside air can be separated and allowed to flow in an air conditioning case. The purpose is to simplify it.

[0008]

In the present invention, attention is paid to the point that the two-layer inside / outside air mode is set at the time of maximum heating (including the time of high heating capacity near the maximum heating). The above object is achieved by sometimes using the hot air bypass door for directly bypassing the hot air to the foot opening side as a movable partition member of the air passage.

That is, in the inventions according to claims 1 to 7,
Foot openings (29, 33) and defroster openings (2
In the blowout mode in which both of the above 5) are simultaneously opened, at least when the maximum heating state is set, the passage of the conditioned air passes through the first air passage (8) through which the inside air flows and the second air passage (9) through which the outside air flows. The first air passage (8) communicates with the foot openings (29, 33), and the second air passage (9) communicates with the defroster opening (2).
An air conditioner for a vehicle, which communicates with the vehicle air conditioner (5), wherein hot air that has passed through the heating heat exchanger (13) is passed through the foot openings (29, 3).
3) and the first hot air passage (19a) leading to the side of the defroster opening (25) and the hot air that has passed through the heating heat exchanger (13) bypass the first hot air passage (19a). A second warm air passage (30) directly leading to the foot openings (29, 33), and an inlet (2) of the second warm air passage (30).
1) a hot air bypass door (22) for opening and closing 1).
In the two-layer flow mode in which the air passage (8) and the second air passage (9) are defined, the hot air bypass door (22) opens the inlet portion (21) and opens the first hot air passage ( 1
9a) is operated at a position where it is divided into a first air passage (8) and a second air passage (9).

[0010] Thus, the hot air bypass door (22) itself can also serve as a movable partition member for the inside and outside air, so that the installation area of the fixed partition member can be reduced, and the air conditioning unit can be reduced in size and configuration. Simplification can be achieved. In particular, the invention according to claim 2 switches and opens / closes the inside air inlets (2, 2a) and the outside air inlet (3) provided at the inlets of the first air passage (8) and the second air passage (9). The switching order between the inside / outside air switching doors (4, 5) and the hot air bypass door (22) is defined, and the outside air is supplied to both the first air passage (8) and the second air passage (9). When switching from the whole outside air mode for introducing air to the two-layer flow mode for introducing inside air to the first air passage (8) and outside air to the second air passage (9), the hot air bypass door (22) is opened. First, the inside / outside air switching doors (4, 5) are moved to the operation position in the two-layer flow mode, and the mode is switched from the two-layer flow mode to the whole outside air mode. When the inside / outside air switching doors (4, 5) are It is moved to,
Then, the hot air bypass door (22) is connected to the entrance (21).
Is moved to a normal position for closing.

According to this, in the switching process between the whole outside air mode and the two-layer flow mode, the phenomenon that the inside and outside air are temporarily mixed and flow into the defroster opening (25) side can be reliably avoided, and the window can be reliably prevented. Glass fogging can be reliably prevented. According to the fifth aspect of the present invention, the foot opening (2)
9, 33) for opening and closing the foot door means (31, 31)
0), and the hot-air bypass door (22) has an entrance (2).
As the mode shifts from the normal mode in which the hot air bypass door (22) is closed to the two-layer flow mode in which the inlet (21) is opened, the foot door means (31, 310) are opened. It is characterized in that it is operated to a position where the opening degree of the portions (29, 33) is reduced.

By the way, in the blowing mode in which both the foot openings (29, 33) and the defroster openings (25) are simultaneously opened, the hot air bypass door is used for switching between the two-layer flow mode and the normal mode. (22) is at the entrance (2
When opening and closing 1), the pressure loss in the passage on the side of the foot openings (29, 33) fluctuates greatly, and the foot openings (29, 33)
Then, the ratio of the amount of air blown out from the (defroster opening 25) greatly changes.

Therefore, according to the invention described in claim 5, when the mode shifts from the normal mode to the two-layer flow mode,
Connect the foot door means (31, 310) to the foot opening (2).
By operating the opening position of the hot air bypass door (22) to reduce the pressure loss of the foot opening (29, 33) side passage due to the opening operation of the hot air bypass door (22), it is possible to cancel the two layers. Even if there is a switch between flow mode and normal mode,
A change in the ratio between the amount of air blown out from the foot openings (29, 33) and the amount of air blown out from the defroster openings (25) can be effectively suppressed.

According to the present invention, the foot opening for front seat (29) and the foot opening for rear seat (33) communicated with each other by the second hot air passage (30). ), The inlet portion (21) of the second warm air passage (30) is arranged so as to face the air downstream surface of the heating heat exchanger (13), and the rear seat foot opening (33) is provided. ) Is arranged at a position immediately after the entrance part (21).

Thus, in the two-layer flow mode, the warm air immediately after the heating heat exchanger (13) can be positively introduced into the front seat foot opening (29) through the second warm air passage (30). In addition, the amount of hot air blown out from the front seat foot opening (29) can be increased, the heating effect can be improved, and at the time of normal heating other than the two-layer flow mode (the entrance (21) is replaced with the door (22)
Is closed), the second warm air passage (30) is
Conversely, it can function as a rear seat hot air passage for guiding warm air from the front seat foot opening (29) to the rear seat foot opening (33).

That is, in the vehicle having the rear seat foot opening (33), one common hot air passage (30) is
In the laminar flow mode as well as in other normal heating, it can be effectively used, and the configuration can be further simplified. In particular, according to the seventh aspect of the present invention, in the two-layer flow mode, the front end of the hot air bypass door (22) is connected to the second air passage (9).
The stop position of the hot-air bypass door (22) is set so as to shift by a predetermined amount to the area (2).

As described above, the tip of the hot-air bypass door (22) is shifted by a predetermined amount to the area of the second air passage (9) in the two-layer flow mode, so that the hot-air bypass door (22) is provided. The outside air of the second air passage (9) flows into the first air passage (8) through the gap at the end of the first air passage (9). Therefore, the inside air of the first air passage (8) is transferred to the second air passage (9).
It is possible to prevent the air from leaking into the air blown from the side, and eventually from the defroster, and to prevent the antifogging property of the vehicle window glass from deteriorating.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 and 2 show a first embodiment of the present invention. This first embodiment is used for heating such as a vehicle equipped with a diesel engine, an electric vehicle, a hybrid vehicle and the like. The present invention is applied to an air conditioner in a vehicle in which it is difficult to secure a sufficient heat source.

FIG. 1 is a schematic diagram showing the entire configuration of the air-conditioning apparatus ventilation system according to the first embodiment, and FIG. 2 is a longitudinal sectional view of the air-conditioning unit therein. In FIG. 1, the ventilation system of the air conditioner is roughly divided into a blower unit 1 and an air conditioning unit 1.
00 is divided into two parts. First, the blower unit 1 will be described. The blower unit 1 is disposed in the lower part of the instrument panel in the vehicle cabin so as to be offset from the center toward the passenger seat side. First and second inside air inlets 2 for introducing vehicle interior air),
2a and an outside air inlet 3 for introducing outside air (outside the vehicle compartment). These inlets 2, 2a, 3 can be opened and closed by first and second inside / outside air switching doors 4, 5, respectively.

The inside and outside air switching doors 4 and 5 are respectively operated to rotate about the rotation shafts 4a and 5a, respectively. Operated in conjunction with the air introduction mode control signal. Then, a first (inside air side) fan 6 and a second (outside air side) fan 7 for blowing the air introduced from the inlets 2, 2 a, and 3 are arranged in the blower unit 1. The fans 6 and 7 are composed of a well-known centrifugal multi-blade fan (sirocco fan), and are simultaneously driven to rotate by one common electric motor (not shown).

FIG. 1 shows a state of a two-layer flow mode which will be described later. The first inside / outside air switching door 4 opens the first inside air inlet 2 and closes the outside air passage 3 a from the outside air inlet 3. Therefore, the inside air is sucked into the suction port 6a of the first (inside air) fan 6, while the second inside / outside air switching door 5 closes the second inside air inlet 2a to open the outside air passage 3b from the outside air inlet 3. , The outside air is sucked into the suction port 7a of the second (outside air side) fan 7.

Therefore, in this state, the first fan 6
The inside air from the inside air inlet 2 is blown to the first (inside air side) passage 8, and the second fan 7 sends the outside air from the outside air inlet 3 to the second
(Outside air side) It is designed to blow air to the passage 9,
The second passages 8 and 9 are partitioned by a partition plate 10 arranged between the first fan 4 and the second fan 5. The partition plate 10 can be integrally formed with a resin scroll casing 10a that houses the fans 6 and 7.

Further, in the present embodiment, in the two-layer flow mode, the inside air volume blown by the first fan 6 in the two-layer flow mode in order to achieve both improvement of the heating capacity and securing of the anti-fog property of the window glass. It is set so that the amount of outside air blown by the second fan 7 is larger than that. That is, in the two-layer flow mode, the ventilation resistance (pressure loss) on the first passage 8 side and the second
In consideration of the ventilation resistance (pressure loss) on the passage 9 side, the blowing capacity of the first fan 6 is set such that the amount of outside air blown by the second fan 7 is larger than the amount of inside air blown by the first fan 6. In addition, the blowing capacity of the second fan 7 is set.

More specifically, the second passage 9 side is made larger than the passage sectional area on the first passage 8 side, and the ventilation resistance (pressure loss) on the second passage 9 side is made smaller than that on the first passage 8 side. Or the air blowing capacity of the second fan 7 is made larger than that of the first fan 6 in a state of a single fan, or both the ventilation resistance and the air blowing capacity are combined so that the air volume is smaller than the internal air volume in the two-layer flow mode. Increase the ratio of outside air volume.

According to the experimental study of the present inventors, the ratio between the inside air amount and the outside air amount in the two-layer flow mode is specifically,
A ratio of about 4.5 to 5.5 is preferable for achieving both the above-mentioned heating capacity and anti-fog property of window glass. Next, the air-conditioning unit 100 includes an evaporator (cooling heat exchanger) 1 in one air-conditioning case 11.
2 and a heater core (heating heat exchanger) 13 are both integrated. Hereinafter, a specific structure of the air conditioning unit 100 will be described in detail with reference to FIG.

The air-conditioning case 11 is made of a molded article of a resin having a certain degree of elasticity and excellent strength, such as polypropylene, and is divided into two parts having a dividing surface in the vertical direction (vertical direction of the vehicle) in FIG. It consists of the case. The left and right two-part case accommodates the heat exchangers 12 and 13 and devices such as doors to be described later, and is then integrally connected by fastening means such as metal spring clips and screws to form the air conditioning case 11.

The air-conditioning unit 100 is disposed at a substantially central portion of the lower part of the instrument panel in the vehicle interior in the left-right direction of the vehicle. An air inlet 14 is provided, and the conditioned air blown from the blower unit 1 flows into the air inlet 14. The air inlet 14 is open on the side of the air-conditioning case 11 on the passenger seat side to connect to the air outlet of the blower unit 1 disposed at the front part of the passenger seat.

In the air conditioning case 11, the air inlet 1
The evaporator 12 is provided with the first and second air passages 8 and 9 immediately after the evaporator 12.
It is arranged so as to cross the whole area. This evaporator 12
As is well known, the latent heat of evaporation of the refrigerant in the refrigeration cycle is absorbed from the conditioned air to cool the conditioned air. Here, as shown in FIG. 2, the evaporator 12 is installed in the air-conditioning case 11 so as to be thin in the vehicle front-rear direction and oriented in the vehicle vertical direction in the longitudinal direction.

The air passage from the air inlet 14 to the evaporator 12 is divided by a partition plate 15 into a first air passage 8 on the lower side of the vehicle and a second air passage 9 on the upper side of the vehicle. The partition plate 15 is a fixed partition member formed integrally with the air-conditioning case 11 with resin and extending in the horizontal direction.
The downstream side of the air flow of the evaporator 12 (the rear side of the vehicle)
The heater cores 13 are adjacently arranged at a predetermined interval. The heater core 13 reheats the cold air that has passed through the evaporator 12, in which high-temperature engine cooling water (hot water) flows, and heats the air using the cooling water as a heat source. Like the evaporator 12, the heater core 13 is thin in the vehicle front-rear direction and installed in the air-conditioning case 11 so as to be oriented in the vehicle vertical direction in the longitudinal direction. However, the heater core 13 is arranged to be inclined toward the vehicle front side by a slight angle from the vertical.

In the air conditioning case 11, the heater core 1
A cool air bypass passage 16 through which air (cool air) flows bypassing the heater core 13 is formed in an upper portion of the heater 3. In the air-conditioning case 11, between the heater core 13 and the evaporator 12, the ratio of the amount of hot air heated by the heater core 13 and the amount of cool air bypassing the heater core 13 (that is, the cool air flowing through the cool air bypass passage 16) is adjusted. A main air mix door 17 and an auxiliary air mix door 18 are arranged. Here, the air mixing doors 17 and 18 are integrally connected to rotating shafts 17a and 18a arranged in the horizontal direction, respectively, and are rotatable in the vehicle vertical direction together with the rotating shafts 17a and 18a. I have.

The rotating shafts 17a and 18a are
, And one end of each of the rotating shafts 17a, 18a protrudes outside the air conditioning case 11, and is connected to a link mechanism (not shown). Both air mix doors 17,
Reference numeral 18 is operated in conjunction with the air temperature control signal of the air conditioner via the link mechanism and an actuator such as a servomotor.

The rotating shaft 17a of the main air mixing door 17 is arranged above the rotating shaft 18a of the auxiliary air mixing door 18 at a predetermined interval, and the main and auxiliary air mixing doors 17, 18 interfere with each other. The air mixing doors 17 and 18 are turned to the position where they wrap each other as shown by the two-dot chain line in FIG. Both air mix doors 17 and 18 are pressed against the protruding ribs on the air conditioning case 11 side, and the air inflow path to the heater core 13 is completely closed.

On the other hand, at the time of maximum heating, both the air mixing doors 17 and 18 are rotated to the solid line positions in FIG.
At the same time that the end of the auxiliary air mix door 18 is completely closed and the tip of the auxiliary air mix door 18 is located immediately after the evaporator 12 and in the vicinity of the extension line A of the partition plate 15, the auxiliary air mix door 18 The air passage between the heater core 13 and the first air passage 8 and the second air passage 9 serve as a movable partitioning member.

In particular, in this embodiment, the auxiliary air mix door 1
8 is set so as to shift a predetermined amount toward the second air passage 9 side from the extension line A of the partition plate 15. In addition,
The evaporator 12 is of a well-known lamination type, and is formed by laminating a large number of flat tubes formed by laminating two thin metal plates made of aluminum or the like with corrugated fins therebetween and brazing integrally. The inside of the evaporator 12 can partition the air passage on the extension line A by the fin surface of the corrugated fin or the flat surface of the flat tube, whereby the first air passage 8 and the second air passage 9 can also be formed inside the evaporator 12. Can be sectioned.

In the air-conditioning case 11, a partition wall 19 extending in the vertical direction at a predetermined interval from the heater core 13 is provided downstream of the heater core 13 (a portion on the vehicle rear side). The partition wall 19 forms a first hot air passage 19a that is upward from immediately after the heater core 13. The downstream side (upper side) of the first hot air passage 19a merges with the cold air bypass passage 16 at an upper portion of the heater core 13, and
A cold / hot air mixing space 20 for mixing cold and hot air is formed.

A hot air bypass inlet 21 is opened at the lower end of the partition wall 19 so as to face the downstream surface of the heater core 13. It is opened and closed by the wind bypass door 22.
The hot air bypass door 22 is connected to a rotating shaft 23 rotatably disposed at an upper end of the hot air bypass inlet 21,
The rotary shaft 23 is rotated integrally between the solid line position and the two-dot chain line position in FIG. In this example, the hot-air bypass door 22 is operated according to a blow-out air temperature control signal and a blow-out mode control signal of the air conditioner through an unillustrated link mechanism and an actuator such as a servomotor.

When the maximum heating state is set (two-layer flow mode) in a foot blow mode and a foot defroster blow mode, which will be described later, the hot air bypass door 22 is positioned at the solid line in FIG. 2 (partition of the heater core 13). (The position near the line B) and acts as a movable partition member that partitions the first warm air passage 19a immediately after the heater core 13 into the first air passage 8 and the second air passage 9. The stop position of the hot-air bypass door 22 in the two-layer flow mode is the same as the auxiliary air mix door 18 except that the tip of the door 22
Is shifted to the second air passage 9 side by a predetermined amount.

The heater core 13 is of a well-known type, and a large number of flat tubes formed by joining thin metal plates of aluminum or the like to have a flat cross section by welding or the like are laminated and arranged with corrugated fins interposed therebetween, and are integrally brazed. Things. The inside of the heater core 13 can partition the air passage on the partition line B by the fin surface of the corrugated fin or the flat surface of the flat tube.
The first air passage 8 and the second air passage 9 can also be formed in the interior 3.

On the upstream side of the heater core 13 in the air,
The partition line B and the rotation axis 1 of the auxiliary air mix door 18
7a is fixed to the air conditioning case 11
It is integrally molded with. On the upper surface of the air conditioning case 11, a defroster opening 25 is opened at a portion on the vehicle front side. The defroster opening 25 receives temperature-controlled conditioned air from the cold / hot air mixing space 20, and blows air toward the inner surface of the vehicle window glass through a defroster duct and a defroster outlet (not shown).
Inlet hole 2 provided in the passage leading to defroster opening 25
5a is opened and closed by a defroster door 26. The defroster door 26 is rotatable about a rotation shaft 27.

On the upper surface of the air-conditioning case 11, a face opening 28 is opened at a position on the vehicle rear side (closer to the occupant) than the defroster opening 25. The face opening 28 also receives temperature-controlled conditioned air from the cold / hot air mixing space 20 through the communication passage 36. The occupant's head is opened through a face duct (not shown) from a face outlet at the upper part of the instrument panel. Blow the wind towards the club.

In the air-conditioning case 11, a front seat foot opening 29 is formed on the upper side of the side surface on the vehicle rear side. The front-seat foot opening 29 allows the temperature-controlled conditioned air from the cold / hot air mixing space 20 to flow in through the communication passage 36, and at the time of maximum heating, the opening of the hot-air bypass inlet 21 allows the bypass inlet to be opened. The warm air from 21 flows in through the second warm air passage 30. Then, the front seat foot opening 29 blows warm air from the front seat foot outlet through the front seat foot duct (not shown) to the feet of the occupant on the front seat side.

The entrance hole 29a of the front seat foot opening 29.
And a face opening portion 28, a foot / face switching door 31 is installed rotatably about a rotation shaft 32,
The entrance hole 2 of the front seat foot opening 29 is formed by the door 31.
9a and the face opening 28 are switched open and closed. In the air-conditioning case 11, a rear seat foot opening 33 is opened at the lower portion of the side surface on the vehicle rear side (closer to the occupant) so as to face immediately after the hot-air bypass inlet 21. Hot air from the hot air bypass inlet 21 and the second hot air passage 30 flows into the rear seat foot opening 33, and this hot air is blown through the rear seat foot duct (not shown). Warm air is blown from the exit to the rear passengers' feet.

At the lower end of the hot air bypass inlet 21, a hot air guide plate 34 for guiding the hot air toward the second hot air passage 30 is provided. In the present embodiment, in the two-layer flow mode in the foot blowing mode, the hot air bypass door 22 is operated at the solid line position on the downstream side of the heater core 13 to partition the first and second air passages 8 and 9. When the defroster door 26 opens the communication passage 36, the first and second air passages 8,
9 communicates near the front seat foot opening 29.

The defroster door 26 and the foot / face switching door 31 are door means for switching the blowing mode, are connected to a link mechanism (not shown), and control the blowing mode of the air conditioner by an actuator such as a servomotor. It is operated in conjunction with a signal.
Each of the doors 4, 5, 17, 18, 22, 22,
6, 31 have the same structure in a single state,
Each rotating shaft 4a, 5a, 17a, 18a, 23, 27, 3
2 has a resin or metal door substrate integrally joined thereto, and has a structure in which an elastic sealing material such as urethane foam is adhered to both front and back surfaces of the substrate.

In this embodiment, the foot / door switching means 31 constitutes a foot door means. Next, the operation of the first embodiment will be described in the above configuration. As is well known, the vehicle air conditioner receives operation signals from various operation members provided on the air conditioning operation panel and various sensors for air conditioning control. And an electronic control unit (not shown) to which the sensor signals of the respective doors 4, 5, 17, 18, 22, 22 and 2 are input.
The positions of 6, 31 are controlled.

FIG. 3 shows a state in which the maximum heating state is set and the two-layer flow mode is set in the foot blowing mode, and FIGS. 1 and 2 show the same state. In this state, in the blower unit 1, the first inside air introduction port 2 communicates with the suction port 6 a of the first (inside air side) fan 6, and the outside air introduction port 3 connects with the second (outside air side) fan 7. 7
communicate with a. Therefore, in this state, the first fan 6
Sends the inside air from the inside air inlet 2 to the first (inside air side) passage 8, and the second fan 7 sends outside air from the outside air inlet 3 to the second (outside air side) passage 9.

In the air-conditioning unit 100, both the air mixing doors 17 and 18 are rotated to the solid line positions shown in the drawing, so that the main air mixing door 17 fully closes the inlet hole 16a of the cool air bypass passage 16, and at the same time, The distal end of the auxiliary air mix door 18 is set at a position immediately after the evaporator 12 and shifted by a predetermined amount toward the second air passage 9 from the extension line A of the partition plate 15. As a result, the auxiliary air mix door 18 functions as a movable partition member that partitions the air passage between the evaporator 12 and the heater core 13 into the first air passage 8 and the second air passage 9.

The hot-air bypass door 22 is operated at a position indicated by a solid line in the figure to partition the first hot-air passage 19a immediately after the heater core 13 into a first air passage 8 and a second air passage 9. And opens the hot air bypass inlet 21. Also, the defroster door 26
Is operated at an intermediate position between the communication passage 36 and the entrance hole 25a of the defroster opening 25, and both the openings 25a and 36 are opened. The foot / face switching door 31 closes the face opening 28 and opens the front seat foot opening 29.

Therefore, by operating the fans 6 and 7, the inside air from the inside air inlet 2 and the outside air from the outside air inlet 3 are separated by the partition members 10, 15, 18, and 22, and the first air passage is formed. 8 and the second air passage 9 flow while being divided. All of the inside air and outside air pass through the heater core 13 and are heated to the maximum. Inside air is heater core 1
After being heated at 3, the air passes through the warm air bypass inlet 21 and the second warm air passage 30 to reach the front seat and rear seat foot openings 29 and 33. On the other hand, the outside air is heated by the heater core 13, passes through the first hot air passage 19 a above the hot air bypass door 22, reaches the cold / hot air mixing space 20, and from there, the outside air flows into two flows. After branching, one of the outside air flows into the defroster opening 25, and the remaining outside air flows into the front seat foot opening 29 through the communication passage 36.

As a result, the warm air heated from the low-humidity outside air flows through the defroster opening 25, and the low-humidity warm air blows out to the inner surface of the windowpane, so that the antifogging property of the windowpane is sufficiently secured. it can. In addition, a high-temperature hot air that mainly heats the inside air is blown out to the front seat and rear seat foot openings 29 and 33, so that the heating effect can be improved. In FIG. 2, an arrow C indicates a flow of inside air, and an arrow D indicates a flow of outside air.

At this time, the ratio between the amount of air blown out to the defroster opening 25 and the amount of air blown out to the foot openings 29 and 33 is determined by operating the defroster door 26 to an intermediate position to reduce the outside air on the second air passage 9 side. By flowing into the front seat foot opening 29 side, the amount of air blown out to the foot openings 29 and 33 can be set to about 80%, and the amount of air blown out to the defroster opening 25 can be set to about 20%.

Further, in the two-layer flow mode, it should be noted that despite the formation of the communication passage 36 that connects the first air passage 8 and the second air passage 9 downstream of the heater core 13. The point is that inside air is effectively prevented from entering the defroster opening 25 side. That is, as described above, in the two-layer flow mode, the ratio of the outside air amount is larger than the inside air amount (specifically, 4.5 to 5.5).
In addition, the outside air is guided by the defroster door 26 so that the dynamic pressure of the outside air that has reached the position of the cold / hot air mixing space 20 is directed to the communication passage 36, and the defroster opening 25 side Since the ventilation resistance of the front seat and rear seat foot openings 29 and 33 is sufficiently smaller than the ventilation resistance of the air passage of the inside, the dynamic pressure of the inside air reaching the front seat foot opening 29 is reduced. Is reduced by slipping into the front seat foot opening 29, so that the inside air does not flow backward through the communication passage 36 and enter the outside air on the defroster opening 25 side.

In the two-layer flow mode, the tip of the hot air bypass door 22 is shifted by a predetermined amount from the partition line B inside the heater core 13 to the area of the second air passage 9 (outer air layer area). The stop position of the hot air bypass door 22 is set. As a result, the dynamic pressure of the outside air in the second air passage 9 acts on the gap at the tip of the hot air bypass door 22, and the outside air tends to flow into this gap. Therefore,
Leakage of the inside air of the first air passage 8 to the outside air layer region through this gap can be favorably suppressed.

Next, in the foot blowing mode, when the air mixing doors 17 and 18 are operated from the maximum heating state to the intermediate opening position for controlling the blowing air temperature, the air conditioning unit 100 is in the normal mode shown in FIG. Becomes In the normal mode state, both the air mix doors 17 and 18 are operated to the intermediate opening position, and the main air mix door 17 opens the cool air bypass passage 16. Directly to the cold / hot air mixing space 20.

In conjunction with the operation of the two air mixing doors 17 and 18, the hot air bypass door 22 is operated to the position indicated by the solid line in FIG. The partitioning action on the warm air passage 19a is extinguished. Therefore, all the warm air heated by passing through the heater core 13 rises in the first warm air passage 19a and then mixes with the cool air from the cool air bypass passage 16 in the space 20 to reach a desired temperature. Most of the warm air passes through the communication passage 36, and the front and rear foot openings 2 are formed.
It reaches the 9 and 33 sides and blows out to the occupant's feet.

The remaining hot air in the space 20 reaches the defroster opening 25 and blows out to the inner surface of the window glass. In the foot blowing mode in the temperature control region shown in FIG. 4, since the maximum heating capacity is not required, the inside / outside air introduction mode is
Usually, the first and second inside air introduction ports 2 and 2a are both closed, and the whole outside air mode is set in which only the outside air introduction port 3 is opened. However, by setting by manual operation of the occupant, the outside air inlet 3 is closed and the first and second inside air inlets 2 and 2a are both opened to set a full inside air mode. May be introduced into the inside / outside air mixing mode.

In the foot blowing mode in this temperature control area, the amount of air blown to the front seat and rear seat foot openings 29 and 33 tends to decrease due to the blockage of the hot air bypass inlet 21. FIG. 4 shows the position of the door 26.
In the mode, the opening area of the communication passage 36 is changed to a position where the opening area is larger than that in FIG.

Next, FIG. 5 shows the maximum heating in the foot defroster blowing mode in which the amount of air blown out from the front and rear foot openings 29 and 33 is substantially equal to the amount of air blown out from the defroster opening 25. The state is set and the two-layer flow mode is set. In the two-layer flow mode in the foot defroster blowing mode, the position of the defroster door 26 is operated to a position that closes the communication passage 36 as understood from the comparison with FIG.

As a result, there is no air flow from the communication passage 36 to the front seat foot opening 29 side, so that the amount of air blown out from the front seat and rear seat foot openings 29 and 33 is reduced.
It is possible to make the amount of air blown from the defroster opening 25 substantially equal. The other points are the same as the two-layer flow mode in the foot blowing mode. The air conditioning unit 100
Since the ventilation resistance of each part in varies in each product, in the two-layer flow mode in the foot defroster blowing mode,
Of course, the defroster door 26 may be operated to a position where the communication passage 36 is slightly opened. In this way, in the two-layer flow mode, not only in the foot blowing mode but also in the foot defroster blowing mode, outside air flows into the front seat foot opening 29 through the communication passage 36 from the second air passage 9 side. Become.

Next, FIG. 6 shows a normal mode state in which the air mixing doors 17 and 18 are operated from the maximum heating state to the intermediate opening position for controlling the blown air temperature in the foot defroster blowing mode. In this normal mode state, in conjunction with the operation of both air mix doors 17 and 18,
The hot air bypass door 22 is operated to the solid line position in FIG. 6 to close the hot air bypass inlet 21. Therefore, in order to secure an air flow passage to the front and rear seat foot openings 29 and 33, the defroster door 26 is operated to the intermediate position shown in FIG. And the amount of air blown out to the defroster opening 25 side is substantially equalized.

FIG. 7 shows the state of the face blowing mode, in which the doors 22, 26 and 31 are respectively operated to the solid line positions to open only the air passage to the face opening 28. Both air mix doors 17 and 18 are provided with heater core 13.
The maximum cooling state in which the air inflow path to the air conditioner is fully closed is shown.
Therefore, all the cool air cooled by the evaporator 12 passes through the bypass passage 16 and blows out to the face opening 28 side.

By rotating both air mix doors 17 and 18 from the maximum cooling state to the maximum heating side, the blown air temperature in the face blowout mode can be arbitrarily adjusted. FIG. 8 shows the state of the bi-level blowing mode. In the face blowing mode, the foot / face switching door 32 is operated to the intermediate position, and the air passage toward the face opening 28 and the foot opening 29 are opened. , 33 at the same time. Thereby, the cool air from the cool air bypass passage 16 mainly flows to the face opening 28 side, and the warm air from the first warm air passage 19a mainly flows to the foot openings 29 and 33. Is lower than the blowing temperature on the side of the foot openings 29 and 33, and a blowing temperature distribution of head cold foot heat is obtained.

FIG. 9 shows the state of the defroster blowing mode, in which the doors 22, 26 and 31 are respectively operated to the solid line positions to open only the air passage to the defroster opening 25. The air mixing doors 17 and 18 are in the maximum heating state in which the cold air bypass passage 16 is fully closed. However, by rotating the air mixing doors 17 and 18 from the maximum heating state to the maximum cooling side, the defroster blows out. The outlet air temperature in the mode can be adjusted arbitrarily.

In the defroster blowing mode, the hot-air bypass door 22 is operated to a position where the hot-air bypass inlet 21 is closed to prevent hot air from flowing out to the second hot-air passage 30 side. In the first embodiment, the case where the hot air bypass door 22 is driven by a drive mechanism provided independently of the drive mechanism (link mechanism and drive servomotor) of the air mix doors 17 and 18 has been described. It is also possible to drive the hot air bypass door 22 using a common drive mechanism with the air mix doors 17 and 18.

For example, the rotating shaft 2 of the hot air bypass door 22
3 to the air mix door 1 via an appropriate link mechanism.
7 and 18 are connected to the output shafts of the driving servomotors, and in a mode other than the foot blowing mode and the foot defroster blowing mode, for example, in the defroster blowing mode, even when both the air mix doors 17 and 18 are in the maximum heating state, the temperature is not increased. The wind bypass door 22 is connected to the warm air bypass inlet 21.
2 and the hot air bypass door 22 is moved from the closed position of the hot air bypass inlet 21 only at the time of maximum heating in the foot blowing mode and the foot defroster blowing mode. The position is switched to the partition position between the first air passage 8 and the second air passage 9.

For this purpose, the amount of rotation of the servo motor for driving the air mix door is increased at the time of maximum heating in the foot blowing mode and the foot defroster blowing mode as compared with the time of maximum heating in the other blowing modes. Due to the increase in volume, both air mix doors 1
With the warm air bypass door 22 closed from the closed position of the warm air bypass inlet 21 while the air conditioners 7 and 18 are maintained in the maximum heating state,
What is necessary is just to switch to the partition position of the air passage 8 and the 2nd air passage 9.

(Second Embodiment) In the first embodiment described above, the inside / outside air switching door 4 of the blower unit 1
5 and the hot air bypass door 2 in the air conditioning unit 100
The present inventor specifically conducted an experimental study on the switching order between the outside air switching door 2 and the hot air bypass door 22 based on a predetermined switching order. It has been found that the fogging of the window glass can be more effectively prevented in the process of switching between the inside and outside two-layer flow mode. The second embodiment relates to the definition of the switching order.

FIGS. 10 and 11 show a blower unit 1 and an air conditioning unit 100 according to a second embodiment.
The configuration is basically the same as that of the first embodiment, and the same or equivalent parts are denoted by the same reference numerals. In the blower unit 1 shown in FIG. 10, the outside air inlet 3 and the second inside air inlet 2a are arranged adjacent to each other at the upper part of the unit, and the outside air inlet 3 and the second inside air inlet 2a are connected to the second inside / outside air switching door. 5 switches and opens and closes. An air filter 40 for purifying the air introduced from the outside air inlet 3 and the inside air inlet 2a (removal of dust, adsorption of odor, etc.) is provided by a second air filter 40.
It is arranged below the inside / outside air switching door 5.

An electric motor 42 for driving the fan is arranged below the first fan 6 on the inside air side.
2 drives the first fan 6 on the inside air side and the second fan 7 on the outside air side. The suction port 6a of the first fan 6 can communicate with the first inside air introduction port 2 and has a communication passage 43.
Through the space 44 on the downstream side of the air filter 40. The first inside / outside air switching door 4 switches and opens / closes the first inside air inlet 2 and the communication passage 43.

In the air conditioning unit 100 shown in FIG. 11, a door mechanism for switching the blowing mode is changed as compared with the first embodiment. That is, the defroster door 26 is a butterfly-shaped door that rotates about the rotation shaft 27, and opens and closes the inlet hole 25 a of the defroster opening 25. The defroster door 26 does not participate in opening and closing the communication passage 36 in this example.

The foot / face switching door 31 in the first embodiment is divided into a face door 31 and a foot door 310, and the face door 31 and the foot door 310 are centered on the rotation shaft 32 and the rotation shaft 311 respectively. A face opening 28 and a front seat foot opening 29 having an entrance hole 2
9a is opened and closed.

The defroster door 26 and the face door 3
1, and the foot door 310 is a door means for blowing mode switching, and is connected to a link mechanism (not shown),
Actuators such as servo motors are operated in conjunction with each other in response to a blowing mode control signal of the air conditioner. The other points are the same as the first embodiment.

FIG. 12 shows the state of the all outside air mode in the foot defroster blowing mode, and FIG. 13 shows the state of the inside / outside air two-layer flow mode in the blowing mode. In the foot blowing mode, the defroster door 26
The other points are the same except that the opening of the foot door 310 decreases and the opening of the foot door 310 increases. In the process of switching from the total outside air mode of FIG. 12 to the inside / outside air two-layer flow mode of FIG.
The inventor first examined setting the state shown in FIG. The state of FIG. 14 shows a state in which the first inside / outside air switching door 4 is moved to the open position of the first inside air inlet 2 before the hot air bypass door 22 from the state of the whole outside air mode of FIG. ing. And the hot air bypass door 22
Moves to the inside / outside air partition position shown in FIG.

However, in the above switching process, FIG.
Occurs, the inside and outside air that has been divided up to the upstream of the heater core 13 is discharged to the first hot air passage 1 downstream of the heater core 13.
Since the mixing is performed at 9a, it has been found that the high-humidity air mixed with the inside and outside air flows into the defroster opening 25 temporarily, causing fogging of the window glass. Contrary to the above, FIG.
When switching from the inside / outside air two laminar flow mode to the all outside air mode in FIG. 12, the warm air bypass door 22 is placed in the normal position (the inlet portion 2 of the second warm air passage 30) before the first inside / outside air switching door 4.
Similarly, when the air is moved to the position (close position 1), the high-humidity air in which the inside and outside air are mixed flows into the defroster opening 25 temporarily.

Therefore, in the second embodiment, when the state of the all-outside air mode of FIG. 12 is switched to the two-layer flow of inside / outside air of FIG. 13, as shown in FIG. Before moving 4, the hot air bypass door 22 is always moved to the inside / outside air partition position. Thereby, the defroster opening 25 and the foot openings 29, 3
In any of the three cases, the outside air flows in all, so there is no fear of fogging of the window glass.

Conversely, when switching from the inside / outside air two-layer flow mode shown in FIG. 13 to the all outside air mode shown in FIG. 12, first, as shown in FIG. The inside / outside air switching door 4 is moved to a position where the first inside air introduction port 2 is closed. Thereby, each opening 25, 29, 3
Since all the outside air flows into 3, there is no fear of fogging of the window glass.

As described above, when switching between the all outside air mode and the inside / outside air two-layer flow mode, the order of switching between the first inside / outside air switching door 4 and the hot air bypass door 22 is defined, so that the switching process is performed. The fogging of the window glass can be reliably prevented. The regulation of the door switching order described above can be specifically implemented by electrically controlling the operation of a servomotor (actuator) for driving each door.

FIG. 16 is a system diagram showing an outline of the electric control in the second embodiment.
Is composed of a microcomputer or the like, and receives various sensor signals from a well-known sensor group 51 and various operation signals from an operation member group 52 provided on an air-conditioning operation panel (not shown). Electronic control unit for air conditioning 5
Among the various air conditioning devices controlled by 0, 53 is a servomotor that drives the first inside / outside air switching door 4 and the second inside / outside air switching door 5 via a link mechanism, 54 is the main air mixing door 17, and This servo motor drives the auxiliary air mix door 18 in conjunction with the servo motor 5.
Reference numeral 4 drives the hot air bypass door 22 in a region on the maximum heating side beyond a predetermined rotation angle range for driving the air mixing doors 17 and 18. For such a door drive mechanism,
The modification of the door drive mechanism has already been described at the end of the first embodiment. Reference numeral 55 denotes a servomotor that drives the defroster door 26, the face door 31, and the foot door 310 in conjunction with each other.

The air-conditioning electronic control unit 50 has a preset R
Based on a program stored in the OM, arithmetic processing is performed on each input signal to control the operation of various air-conditioning devices (such as the above-described doors). Explaining only by extracting only, reference numeral 56 denotes a first calculating means for calculating a target outlet air temperature TAO required to maintain the vehicle interior at a set temperature, based on the following formula 1 stored in advance in a ROM. The target outlet temperature TAO into the room is calculated.

[0080]

## EQU1 ## TAO = Kset × Tset−Kr × Tr−Kam ×
Tam−Ks × Ts + C Here, Tset is the temperature set by the temperature setting operation member of the air conditioning operation panel, Tr is the inside air temperature detected by the inside air temperature sensor,
Tam is the outside air temperature detected by the outside air temperature sensor, and Ts is the amount of solar radiation detected by the solar radiation sensor. Also, Kset, Kr
, Kam, and Ks are gains, and C is a correction constant.

Reference numeral 57 denotes control means for the blower fan electric motor 42, which determines a fan motor voltage corresponding to the TAO based on a map stored in advance in the ROM, and applies the determined fan motor voltage to the motor 42. 58 is an air mix door 17, 18
A second calculating means for calculating a temperature control calculation value SW for determining the target opening degree of the temperature control, the temperature control calculation value SW is determined in advance by R
It is calculated based on the following equation 2 stored in the OM.

[0082]

SW = [(TAO−Te) / (Tw−Te)] × 100 (%) where Tw is the temperature of the hot water flowing into the heater core 13 (water temperature) detected by the water temperature sensor, and Te is the evaporator. This is the temperature of the blown air from the evaporator 12 detected by the blown air temperature sensor.

Reference numeral 59 denotes control means for the servo motor 53 for driving the inside / outside air switching doors 4 and 5, and energizing the servo motor 53 in accordance with the temperature control calculation value SW based on a map previously stored in the ROM. Control to determine the motor rotation angle. Numeral 60 denotes control means for a servomotor 54 for driving the air mix doors 17, 18 and the hot air bypass door 22,
Based on the map stored in the ROM in advance, energization of the servomotor 54 is controlled in accordance with the temperature control calculation value SW to determine the motor rotation angle.

Reference numeral 61 denotes a blowing mode door 26, 31, 310.
The control means of the driving servomotor 55 is used to control the target blow-off air temperature T based on a map stored in advance in the ROM.
The energization of the servo motor 55 is controlled corresponding to AO to determine the motor rotation angle. Next, FIG. 17 illustrates the contents of the door control corresponding to the above-described temperature control calculation value SW in the second embodiment, in which each door is controlled as shown in FIG. 17 in the other blowing modes except the defroster blowing mode. Is done. However, since the maximum heating mode is unnecessary in the face mode and the bi-level mode, each door is controlled in an area where the temperature control calculation value SW is smaller than SW3 (SW <SW3).

More specifically, when the temperature control calculation value SW is equal to or less than SW1, the air mix doors 17 and 18 fully open the cold air bypass passage 16 and completely open the ventilation path to the heater core 13. Operated to the maximum cooling position to close. At the same time, the warm air bypass door 22 is operated to the normal position to close the entrance 21. The inside / outside air switching doors 4, 5 open both the inside air introduction ports 2, 2a and close the outside air introduction port 3. It is operated to the shy mode position.

When the temperature control calculation value SW exceeds SW1, which is a sufficiently small value, the first inside / outside air switching door 4 closes the first inside air introduction port 2, opens the communication passage 43, and opens the second inside / outside air switching door 5. Is operated to the position of the full outside air mode in which the second inside air inlet 2a is closed and the outside air inlet 3 is opened. At the same time, the air mix doors 17 and 18 are operated to a position where the ventilation path to the heater core 13 is gradually opened.

When the temperature control calculation value SW exceeds SW1 and S
Until the temperature reaches W2 (a value sufficiently larger than SW1), the hot-air bypass door 22 is held at the normal position for closing the entrance 21 and the first and second inside / outside air switching doors 4, 5 holds the position of the whole outside air mode. On the other hand, during this time, the air mix doors 17 and 18 continuously increase the opening degree of the ventilation path to the heater core 13 to increase the temperature of the blown air.

When the temperature control calculation value SW reaches SW2, the air mix doors 17, 18 are moved to the cool air bypass passage 1
6 is fully closed and the ventilation path to the heater core 13 is fully opened to operate the maximum heating position. However, the hot air bypass door 22
Is still held at the normal position for closing the entrance 21, and the first and second inside / outside air switching doors 4, 5 hold the position in the all outside air mode.

Then, when the temperature control calculation value SW reaches SW3, which is slightly larger than SW2, first, the hot air bypass door 22 moves from the normal position to the two-layer flow position. That is, the hot-air bypass door 22 opens the entrance 21 and the first
The hot air passage 19a is moved to a position that partitions the first and second air passages 8 and 9 from each other. At this time, since the first and second inside / outside air switching doors 4 and 5 still hold the position in the all outside air mode,
A situation in which the inside and outside air are temporarily mixed on the downstream side of the heater core 13 does not occur.

Further, when the temperature control calculation value SW increases from SW3 and reaches SW4, the first inside / outside air switching door 4 moves to the intermediate opening position. By the movement of the door 4 to the intermediate opening position, the first inside / outside air switching door 4 opens both the first inside air introduction port 2 and the communication passage 43 by the intermediate opening. When the temperature control calculation value SW increases from SW4 and reaches SW5, the first inside / outside air switching door 4 fully opens the first inside air inlet 2 and completely closes the communication passage 43. Note that the second inside / outside air switching door 5 always keeps the outside air introduction port 3 open in the range of SW> SW1, so the inside / outside air introduction of the blower unit 1 is started only when SW> SW5. The part is located at a two-layer flow of the inside and outside air. That is, the timing (SW) at which the hot air bypass door 22 switches from the normal position to the two-layer flow position
3), the timing (SW5) at which the inside / outside air introduction portion of the blower unit 1 becomes the inside / outside air two-layer flow position is delayed.

Conversely, when the mode is switched from the inside / outside air two laminar flow mode to the all outside air mode, at the time of SW5, first, in the inside / outside air introduction part of the blower unit 1, the first inside / outside air switching door 4 is moved to the intermediate opening position. Then, at the time of SW4, the first inside / outside air switching door 4 completely closes the first inside air introduction port 2 and fully opens the communication passage 43, so that the inside / outside air introduction part of the blower unit 1 is in the full outside air mode. Switch to

However, at this time, the hot air bypass door 22
Still retains the two-layer flow position, so that the situation where the inside and outside air are temporarily mixed on the downstream side of the heater core 13 does not occur. Then, thereafter, at the time of SW3, the warm air bypass door 22 returns to the normal position from the two-layer flow position. In FIG. 17, in the inside / outside air introduction section of the blower unit 1, the first outside air mode and the two-layer flow mode
The inside / outside air switching door 4 is connected to the first inside air inlet 2 and the communication passage 43.
The reason why the intermediate opening position is provided to open both of them by the intermediate opening degree is as follows. That is, the whole outside air mode and 2
Switching directly between the laminar flow mode and the inside / outside air mode may cause abrupt fluctuations in the temperature, air volume, etc. of the air blown into the vehicle cabin. This is to alleviate sudden fluctuations in temperature, air volume, and the like due to mode switching.

However, the necessity of setting the intermediate opening position varies variously depending on the specifications of the ventilation system of the air conditioner. The purpose of the present invention is to prevent the fogging of the window glass due to the switching of the position, so that the setting of the intermediate opening position is not always necessary. As described above, FIG. 17 shows the door control executed in the blowing mode other than the defroster blowing mode. In the defroster blowing mode, the all outside air mode is always maintained regardless of the temperature control calculation value SW, and the window glass is controlled. Perform anti-fog.

(Third Embodiment) FIGS. 18 to 21 show a third embodiment in which both the foot openings 29 and 33 and the defroster opening 25 are simultaneously opened as in the foot defroster blowing mode and the foot blowing mode. In the blowing mode, even if the mode is switched between the two-layer flow mode and the normal mode, the foot openings 29 and 33 and the defroster openings 25
Thus, it is possible to suppress a change in the ratio of the amount of air blown from the air.

That is, in the first and second embodiments,
In the foot defroster blowing mode and the foot blowing mode, when the hot air bypass door 22 is in the two-layer flow mode position, the opening of the inlet 21 of the second warm air passage 30 causes a pressure loss in the foot openings 29 and 33. Decreases,
The amount of air blown out to the foot openings 29 and 33 increases. On the other hand, when the hot air bypass door 22 is in the normal mode position, the pressure loss of the foot openings 29 and 33 increases due to the blockage of the entrance 21 of the second hot air passage 30, and the foot openings 29 and The amount of air blown to 33 decreases.

As a result, in the foot defroster blowing mode and the foot blowing mode, the foot openings 29, 3
3 and the ratio of the amount of air blown out from the defroster opening 25 greatly changes with switching between the two-layer flow mode and the normal mode. Therefore, in the third embodiment, in the foot defroster blowing mode and the foot blowing mode,
The opening degree of the foot door 310 is changed in conjunction with the switching between the two-layer flow mode and the normal mode to suppress the change in the blowout air volume ratio.

More specifically, the opening adjustment of the foot door 310 will be described. FIG. 18 shows a two-layer flow mode of the foot defroster blowing mode, and FIG. 19 shows a normal mode of the blowing mode. As can be understood from the comparison between FIGS. 18 and 19, the foot door 310 is used in the two-layer flow mode.
Is operated to a position for completely closing the entrance hole 29a of the front seat foot opening 29 (a position where the opening degree is zero), whereas in the normal mode, the foot door 310 is connected to the entrance hole 29a of the front seat foot opening 29. Operated to the fully open position (maximum opening position).

According to this, in the two-layer flow mode, by opening the hot air bypass door 22, the front seat foot opening 29 is opened.
In addition, the reduction in pressure loss of the warm air passage to the rear seat foot opening 33 can be offset by fully closing the foot door 310. On the other hand, in the normal mode, due to the closing of the hot air bypass door 22,
Front seat foot opening 29 and rear seat foot opening 33
The increase in pressure loss of the hot air passage to the hot air passage can be offset by fully opening the foot door 310.

As a result, even when the mode is switched between the two-layer flow mode and the normal mode, a change in the ratio between the amount of air blown out from the foot openings 29 and 33 and the amount of air blown out from the defroster opening 25 is effectively suppressed. it can. FIG. 20 shows a two-layer flow mode of the foot blowing mode, and FIG. 21 shows a normal mode of the blowing mode. As understood from the comparison between FIGS. 20 and 21, in the foot blowing mode, the foot door 310 is operated to the first opening position where the opening is small in the two-layer flow mode, and in the normal mode, the foot door 310 is moved to the first opening position where the opening is large. By operating to the two-opening (full open) position, it is possible to suppress a change in the air volume ratio between the foot side and the defroster side due to switching between the two-layer flow mode and the normal mode.

In the foot defroster blowing mode shown in FIGS. 18 and 19, the defroster door 26 is maintained at a constant opening in both the two-layer flow mode and the normal mode.
Also in the foot blowing modes 0 and 21, the defroster door 26 is maintained at a constant opening in both the two-layer flow mode and the normal mode. However, the opening degree of the defroster door 26 is larger in the foot defroster blowing mode than in the foot blowing mode.

The above-described opening adjustment of the foot door 310 is performed as follows.
Specifically, the control is performed via the link mechanism by controlling the rotation angle of the servomotor 55 (see FIG. 16) by the air-conditioning electronic control device 50 (see FIG. 16). (Other Embodiments) In the first to third embodiments, the operations of the doors 4, 5, 17, 18, 22, 26, and 31 are performed by an actuator such as a servomotor via a link mechanism. Although the case has been described, each of the doors may be operated by a manual operation force applied to a manual operation member such as an inside / outside air introduction setting lever, a temperature control lever, and a blowing mode lever provided on the air conditioning operation panel. Good.

The maximum heating time in which the two-layer flow mode is set is not strictly limited when the air mix doors 17 and 18 are operated at positions where the cool air bypass is completely prevented. This includes the case of the air mix door position that allows a small amount of cool air to be bypassed. In the first to third embodiments, the air conditioning unit 100
The evaporator (cooling heat exchanger) 12 is arranged inside,
Of course, the present invention can be similarly applied to an air conditioner having no cooling heat exchanger.

In the first to third embodiments, the temperature adjusting means for adjusting the heating amount of the conditioned air by the heater core 13 to adjust the air temperature is an air mix door for adjusting the ratio of the amount of cold air to the amount of hot air. Although the hot water valves 17 and 18 are used, instead of the air mixing doors 17 and 18, a hot water valve that adjusts the flow rate of the hot water flowing into the heater core 13 or the temperature of the hot water is used, and the hot water flow rate of the hot water valve (or The present invention can be similarly applied to an air conditioner of the type in which the air temperature is adjusted by adjusting the temperature.

Further, it goes without saying that the present invention can be similarly applied to an air conditioner in which the rear seat foot opening 33 in the first to third embodiments is eliminated.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a ventilation system according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the air conditioning unit of FIG.

FIG. 3 is a cross-sectional view showing a state of a two-layer flow mode in a foot blowing mode of the embodiment.

FIG. 4 is a sectional view showing a state of a normal mode in a foot blowing mode of the embodiment.

FIG. 5 is a sectional view showing a state of a two-layer flow mode in a foot defroster blowing mode of the embodiment.

FIG. 6 is a sectional view showing a state of a normal mode in a foot defroster blowing mode of the embodiment.

FIG. 7 is a cross-sectional view showing a face mode state of the embodiment.

FIG. 8 is a cross-sectional view showing a state in a bilevel mode of the embodiment.

FIG. 9 is a cross-sectional view showing a state of a defroster blowing mode of the embodiment.

FIG. 10 is a sectional view of a blower unit according to a second embodiment of the present invention.

FIG. 11 is a sectional view of an air conditioning unit according to a second embodiment of the present invention.

FIG. 12A is a cross-sectional view of an air conditioning unit in a full outside air mode according to a second embodiment, and FIG. 12B is a cross-sectional view of a blower unit in a full outside air mode according to the second embodiment.

FIG. 13A is a cross-sectional view of an air conditioning unit in a two-layer flow mode of the second embodiment, and FIG. 13B is a cross-sectional view of a blower unit in a two-layer flow mode of the second embodiment.

14A and 14B show a state of a switching process between a full outside air mode and a two-layer flow mode in a comparative example of the second embodiment, and FIG. 14A is a cross-sectional view of the air conditioning unit in the switching process. (B) is a sectional view of the blower unit in the switching process.

FIG. 15 is a diagram showing a state of the second embodiment in the case of the all outside air mode and
Indicates the state of the switching process between the laminar flow mode,
(A) is a sectional view of the air conditioning unit in the switching process,
(B) is a sectional view of the blower unit in the switching process.

FIG. 16 is a system diagram of electric control according to a second embodiment.

FIG. 17 is a control characteristic diagram showing a specific example of door control according to the second embodiment.

FIG. 18 is a sectional view of an air conditioning unit according to a third embodiment of the present invention, showing a state of a two-layer flow mode in a foot defroster blowing mode.

FIG. 19 is a sectional view of an air conditioning unit according to the third embodiment;
The state of the normal mode in the foot defroster blowing mode is shown.

FIG. 20 is a sectional view of an air conditioning unit according to the third embodiment;
The state of the two laminar flow mode in the foot blowing mode is shown.

FIG. 21 is a sectional view of an air conditioning unit according to a third embodiment;
This shows the normal mode in the foot blowing mode.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Blower unit, 2, 2a ... Inside air introduction port, 3 ... Outside air introduction port, 4, 5 ... 1st, 2nd inside / outside air switching door, 6, 7 ...
1st, 2nd fan, 8, 9 ... 1st, 2nd air passage, 11
... air-conditioning case, 12 ... evaporator, 13 ... heater core, 16
... Cool air bypass passage, 17 ... Main air mixing door, 18
... Auxiliary air mix door, 19a ... First hot air passage, 21
… Hot air bypass entrance, 22… hot air bypass door, 25
... defroster opening, 26 ... defroster door, 28 ... face opening, 29 ... front seat foot opening, 30 ... second
Hot air passage, 31 ... Foot face switching door, 33 ... Foot opening for rear seat, 100 ... Air conditioning unit.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasuhiro Sato 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. Inside

Claims (7)

[Claims] A heating heat exchanger (1) for heating conditioned air.
3) and temperature adjusting means (17, 1) for adjusting the heating temperature of the conditioned air by the heating heat exchanger (13) to adjust the air temperature.
8), a foot opening (29, 33) connected to a foot outlet for blowing air toward the passenger's feet, and a defroster connected to a defroster outlet for blowing wind toward the inner surface of the vehicle window glass. An opening (25), and in the blowing mode in which both the foot opening (29, 33) and the defroster opening (25) are simultaneously opened, the temperature adjusting means ( When the maximum heating state in which the air conditioners 17 and 18) are operated is set, at least the air-conditioned air passage is divided into a first air passage (8) through which inside air flows and a second air passage (9) through which outside air flows. Forming the first air passage (8) with the foot opening (29, 3);
3) A vehicle air conditioner that communicates with the third air passage (9) and the defroster opening (25), wherein the hot air that has passed through the heating heat exchanger (13) is The first hot air passageway (19a) leading to the foot opening portions (29, 33) and the defroster opening portion (25), and the hot air that has passed through the heating heat exchanger (13), A second hot air passage (30) that bypasses the hot air passage (19a) and directly leads to the foot openings (29, 33).
And a hot air bypass door (22) for opening and closing an inlet (21) of the second hot air passage (30). The first air passage (8) and the second air passage (9) In the two-layer flow mode in which the hot air bypass door (22) is formed, the hot air bypass door (22) opens the inlet portion (21) and connects the first hot air passage (19a) to the first air passage (8). And a second air passage (9). 2. The first air passage (8) and the second air passage (8).
An inside air inlet (2, 2) provided at the inlet of the air passage (9).
2a) and an outside air introduction port (3); and an inside / outside air switching door (4, 5) for switching and opening / closing the inside air introduction port (2, 2a) and the outside air introduction port (3). 8) and the second air passage (9)
When switching from the full outside air mode in which outside air is introduced into both to the two-layer flow mode in which inside air is introduced into the first air passage (8) and outside air is introduced into the second air passage (9),
After moving the hot air bypass door (22) to the operation position in the two-layer flow mode, the inside / outside air switching door (4, 5) is moved to the operation position in the two-layer flow mode, When switching from the two-layer flow mode to the all outside air mode, after moving the inside and outside air switching doors (4, 5) to the operation position in the all outside air mode, the hot air bypass door (22) is moved to the entrance. The vehicle air conditioner according to claim 1, wherein the part (21) is moved to a normal position where the part (21) is closed. 3. An actuator (53) for driving the inside / outside air switching doors (4, 5); an actuator (54) for driving the hot air bypass door (22); and the temperature adjusting means (17, 18). Calculation means (58) for calculating a temperature control calculation value (SW) for controlling the temperature control; and control means (5) for controlling the driving of the two actuators (53, 54) based on the temperature control calculation value (SW).
9. The vehicle air conditioner according to claim 2, further comprising: (9, 60). 4. A cold air bypass passage (16) for flowing conditioned air by bypassing the heating heat exchanger (13), a cool air from the cool air bypass passage (16) and the first hot air passage (19a). And a cool / hot air mixing space (20) for mixing the hot air from the heating air flow from the heating heat exchanger (13) and the cold air bypass passage (16). Air mix door (17,
The vehicle air conditioner according to any one of claims 1 to 3, wherein 18). 5. A normal mode having a foot door means (310) for opening and closing the foot openings (29, 33), wherein the hot air bypass door (22) closes the entrance (21). From the above, as the hot air bypass door (22) shifts to the two-layer flow mode in which the inlet (21) is opened, the foot door means (31)
The vehicle air conditioner according to any one of claims 1 to 4, wherein (0) is operated to a position where the degree of opening of the foot openings (29, 33) is reduced. 6. A foot opening for a front seat (29) and a foot opening for a rear seat (33), which are communicated with each other through the second warm air passage (30), as the foot opening. 2, the inlet (21) of the warm air passage (30) is arranged so as to face the air downstream surface of the heating heat exchanger (13), and the rear seat foot opening (33) is Entrance (21)
The vehicle air conditioner according to any one of claims 1 to 5, wherein the air conditioner is arranged at a position immediately after the vehicle. 7. In the two-layer flow mode, the hot-air bypass door (22) is shifted such that the tip of the hot-air bypass door (22) shifts by a predetermined amount to the area of the second air passage (9). 7. The vehicle air conditioner according to claim 1, wherein a stop position is set.