JP2000158931A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of supplying the rear seat side with hot air of higher temperature than the front seat side in the case of heating the rear seat side taking precedence over the front seat side. SOLUTION: When a mode of heating the rear seat side taking precedence over the front seat side is set in a blowoff mode of simultaneously opening both foot opening parts 29, 33, a hot air bypass door 22 is opened to lead hot air passing a heater core 13, directly to a second hot air passage 30. The front seat side is supplied with hot air regulated to suitable temperature by air mixing doors 17, 18, and the rear seat side is supplied with the hot air passing the heater core 13 directly via the second hot air passage 30. The front seat side is therefore maintained at suitable temperature, and the rear seat side can be further heated.

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 capable of blowing hot air having different temperatures from foot outlets on a front seat side and a rear seat side, and is particularly suitable for a vehicle having a large interior space. is there.

[0002]

2. Description of the Related Art A prior art of a vehicle air conditioner is disclosed in Japanese Patent Application No. 9-274679. In this conventional technique, in the normal heating state, by appropriately adjusting the opening of the air mixing door, the air passing through the heating heat exchanger and the air bypassing the heating heat exchanger are mixed in the cold / hot air mixing space. After mixing, warm air is supplied from the outlet. On the other hand, when the maximum heating state is set, the air mix door is closed to increase the hot air temperature, and the door that bypasses the cool / hot air mixing space is opened to supply hot air directly to the front seat and rear seat foot outlets. by doing,
The ventilation efficiency of the air passage is reduced, and the heating efficiency is increased by preventing the amount of hot air from decreasing.

[0003]

In the above prior art, the air mix door and the hot air bypass door are driven by a drive mechanism provided independently. However, since the opening and closing of the hot air bypass door is performed only based on the determination as to whether or not the air conditioner is in the maximum heating state, the opening and closing of the air mix door and the hot air bypass door are actually interlocked. Therefore, the temperature of the warm air supplied to the front seat side and the rear seat side is the same.

In a vehicle such as an RV (recreational vehicle) vehicle having a large cabin space, there is a potential problem that the rear seat side is harder to warm up than the front seat side.
That is, the front seat side may be heated to an appropriate temperature, but the rear seat side may want to be further heated. But,
In the above-mentioned prior art, the temperature of the hot air supplied to the front seat side and the temperature of the hot air supplied to the rear seat side are the same, so that only the rear seat side cannot be further heated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has an object to provide a vehicle air conditioner capable of supplying hot air having a higher temperature to a rear seat side than to a front seat side when preferentially heating a rear seat side. The purpose is to provide.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, both foot openings (2) are provided.
9 and 33), when the mode in which the rear seat side is preferentially heated rather than the front seat side is set, the warm air bypass door (22) is opened and the heating heat exchanger (13) is opened. ) Is directly led to the second hot air passage (30).

According to this, both foot openings (29, 3)
In the blowout mode in which 3) is simultaneously opened, when the mode in which the rear seat side is preferentially heated over the front seat side is set, the hot air bypass door (22) is opened even when not in the maximum heating state. Then, warm air adjusted to an appropriate temperature by the temperature adjusting means (17, 18) is supplied to the front seat side,
The warm air that has passed through the heating heat exchanger (13) is directly supplied to the rear seat side through the second warm air passage (30). As a result, the front seat side can be maintained at an appropriate temperature, and the rear seat side can be further warmed. The rear seat side is a heating heat exchanger (1
3) The warm air passed directly through the rear seat foot opening (33)
Therefore, it is possible to reduce the ventilation resistance of the air passage, prevent a decrease in the amount of hot air, and increase the heating efficiency.

According to the second aspect of the present invention, the vehicle further comprises a defroster opening (25) connected to a defroster outlet for blowing air toward the inner surface of the vehicle window glass, wherein both foot openings (29, 33) and the defroster are provided. In the blowing mode in which both the openings (25) are simultaneously opened, the passage of the conditioned air is divided into a first air passage (8) through which inside air flows and a second air passage (9) through which outside air flows. The first air passage (8) communicates with both foot openings (29, 33), and the second air passage (9) communicates with the defroster opening (2).
When the two-layer flow mode is set to communicate with 5), the hot air bypass door (22) opens the inlet portion (21) and defines the first air passage (8) and the second air passage (9). It is characterized by doing.

The hot air bypass door (22) is connected to the entrance (2).
Along with opening and closing 1), the first air passage (8) and the second air passage (9) are also divided, so that the structure can be simplified. As in the third aspect of the present invention, the setting of the mode in which the rear seat side is preferentially heated can be performed by manually switching a switch (52) provided in the vehicle.

[0010] The reference numerals in parentheses above indicate the correspondence with specific means described in the embodiment described later.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. (First Embodiment) FIGS. 1 and 2 show a first embodiment of the present invention. In the first embodiment, as shown in FIG.
The present invention is applied to an air conditioner in a vehicle having a large indoor space.

FIG. 1 is a schematic diagram showing the entire configuration of an air conditioning system ventilation system in the first embodiment, and FIG. 2 is a longitudinal sectional view of an 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 / outside air switching doors 4 and 5 are respectively operated to rotate about 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 3a 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 cross-sectional area of the first passage 8 side, and the ventilation resistance (pressure loss) of the second passage 9 side is made smaller than that of 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 of 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 such as polypropylene and also having excellent strength. 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 substantially at the center in the vehicle left-right direction in the lower part of the instrument panel in the vehicle interior. 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 in a form that is 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 disposed 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 the 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.

Particularly, 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 (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.

At the lower end of the partition wall 19, a hot air bypass inlet 21 is opened so as to face the surface of the heater core 13 on the downstream side of the air. 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 via an actuator such as a link mechanism and a servomotor (not shown). I have.

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 has a solid line position (partition of the heater core 13) in FIG. (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 a well-known one, and is formed by laminating a large number of flat tubes formed by molding a thin metal plate such as aluminum into a flat cross section with corrugated fins interposed therebetween and brazing them integrally. . 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 air passage 8 and the second air passage 9 can be defined.

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 opened 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.

Entrance hole 29a of 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. The rear seat foot opening 33 allows warm air that has passed through the warm air bypass inlet 21 to flow from the rear seat foot outlet through a rear seat foot duct (not shown) to the foot of an occupant on the rear seat side. Blow out.

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 the present embodiment, the foot / door switching means 31 constitutes the foot / door switching 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 position indicated by the solid line in the drawing, so that the main air mixing door 17 completely 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, warm air heated from 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 of 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 air mix 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 flows through the cool air bypass passage 16 in the cool / hot air mixing space 20.
And the desired temperature. This warm air is
Most of the air flows through the communication passage 36 to the front and rear seat foot openings 29 and 33, and blows out to the feet of the occupant.

The remaining hot air in the cold / hot air mixing 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 usually closes both the first and second inside air introduction ports 2 and 2a and sets the outside air introduction port. Set to the whole outside air mode in which only 3 is opened. However, the outside air inlet 3 is closed by the setting by the manual operation of the occupant, and the first and second inside air inlets 2 and 2 are closed.
a may be set to a full inside air mode in which both are opened, or an inside / outside air mixing mode in which the inside air and the outside air are simultaneously introduced as described above.

In the foot blowing mode in this temperature control region, 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, so that the defroster 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 from the front and rear foot openings 29 and 33 and the amount of air blown from the defroster opening 25 are substantially equal. 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 flowing from the communication passage 36 into 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 blow-out air temperature in the face blow-out 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 close the hot air bypass inlet 21 to prevent the hot air from flowing out to the second hot air passage 30 side. FIG. 10 shows a state in which the two air mixing doors 17 and 18 are operated from the maximum heating state to the intermediate opening position for controlling the blowing air temperature in the foot blowing mode, and after being provided on the air conditioning panel. This shows a state where the seat priority switch is set to ON. The rear seat priority switch is set when the temperature near the rear seat is lower than that near the front seat, and the rear seat is to be preferentially heated.

In the rear seat priority mode, usually, in the foot blowing mode, the hot air bypass door 22 is operated to the position shown in FIG. 10 by the solid line to open the hot air bypass inlet 21. The hot-air bypass door 22 passes through the space immediately after the heater core 13 through the hot-air bypass inlet 21 and passes through the second hot-air passage 3.
0 and a path leading to the cold / hot air mixing space 20 via the first passage above the hot air bypass door 22.

Therefore, a part of the warm air heated by passing through the heater core 13 is mixed with the cool air from the cool air bypass passage 16 in the cool / hot air mixing space 20 after rising in the first warm air passage 19a. Temperature. Most of the hot air reaches the front seat foot opening 29 through the communication passage 36 and blows out to the feet of the front seat occupant. In addition, cold and hot air mixing space 2
The remainder of the warm air of 0 reaches the defroster opening 25 side and blows out to the inner surface of the window glass.

On the other hand, the remainder of the heated air that has passed through the heater core 13 passes through the hot air bypass inlet 21, most of which reaches the rear seat foot opening 33 and blows out to the feet of the rear passenger. In the foot blowing mode in the temperature control range shown in FIG. 10, since the maximum heating capacity is not required,
The inside / outside air introduction mode is usually set to an all outside air mode in which the first and second inside air introduction ports 2 and 2a are both closed and 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.

FIG. 11 shows a foot defroster in a normal mode in which both air mix doors 17 and 18 are operated from the maximum heating state to the intermediate opening position for controlling the blown air temperature, and are provided on the air conditioning operation panel. This shows a state where the rear seat priority switch is set to ON. In the rear seat priority mode, usually, in the foot defroster blowing mode, the hot air bypass door 22 is operated to the position shown in FIG. 11 by the solid line to open the hot air bypass inlet 21. The hot-air bypass door 22 passes through the space immediately after the heater core 13 through the hot-air bypass inlet 21 to the second hot-air passage 30 and the first passage above the hot-air bypass door 22 to cool and cool. A partition is formed on the path leading to the wind mixing space 20.

Further, the defroster door 26 is operated to the position indicated by the solid line in FIG. And the front seat foot opening 29
The airflow passage of the warm air mixed to a desired temperature is secured on the side of the defroster opening 25. Therefore, a part of the warm air heated by passing through the heater core 13 rises in the first warm air passage 19 a and then mixes with the cool air from the cool air bypass passage 16 in the cool / hot air mixing space 20 to reach a desired temperature. Become. This warm air blows out to the feet of the occupant of the front seat through the front seat foot opening 29 and blows into the vehicle window glass through the defroster opening 25.

On the other hand, the remaining portion of the warm air heated by passing through the heater core 13 passes through the warm air bypass inlet 21 and most of the warm air reaches the rear seat foot opening 33 and blows out to the feet of the rear passenger. In the first embodiment, the hot-air bypass door 22 is driven by a drive mechanism provided independently of the drive mechanisms (link mechanism and drive servomotor) of the air mix doors 17 and 18.

FIG. 12 is a system diagram showing an outline of the electric control in the first 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
Of 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, and 54 is the main air mix door 17 and the auxiliary A servomotor for driving the air mix door 18 in conjunction with the servomotor 55 for driving the hot air bypass door 22, and a servomotor 63 for driving the defroster door 2.
6, a servomotor that drives 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.

[0066]

## 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 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.

[0068]

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 of the servo motor 54 for driving the air mix doors 17 and 18, based on a map stored in advance in the ROM, controlling the energization of the servo motor 54 in accordance with the temperature control calculation value SW and rotating the motor. Determine the corner.

Numeral 62 denotes a control means of the servomotor 55 for driving the blow-out mode doors 26 and 31. The control means controls the energization of the servomotor 63 in accordance with the target blow-off air temperature TAO based on a map previously stored in the ROM. And determine the motor rotation angle. Numeral 61 denotes a control means of a servomotor 55 for driving the hot air bypass door 22, which controls energization of the servomotor 55 in accordance with the temperature control calculation value SW based on a map stored in advance in the ROM, and controls the motor rotation angle. To determine.

The determination of the position of the hot-air bypass door 22 is specifically performed by a control routine shown in a flowchart of FIG. That is, first, at step 100, it is determined whether or not the air mix doors 17, 18 are in the maximum heating state based on the target opening degree SW. When the air mix doors 17 and 18 are in the maximum heating state, the process proceeds to step 130, where the hot air bypass door 22 is opened. On the other hand, when the air mix doors 17 and 18 are not in the maximum heating state, the process proceeds to the next step 110.

In step 110, the blowing mode is the foot (FOOT) mode or the foot defroster (F /
D) It is determined whether it is in one of the modes.
When the blowing mode is the foot (FOOT) mode or the foot defroster (F / D) mode, step 1
Move to 20. Then, it is determined whether the rear seat priority switch of the operation member group 52 is set to ON. Here, when the rear seat priority switch is set to ON, the process proceeds to step 130, and the hot air bypass door 22 is opened.

On the other hand, in step 110, the blowing mode is the foot (FOOT) mode or the foot defroster (F /
D) When it is determined that the mode is not any of the modes, or when the rear seat priority switch is not set to ON in step 120, the process proceeds to step 140, and the hot air bypass door 22 is closed. As described above, the open / close position of the hot air bypass door 22 is determined.

In this embodiment, the air mix door 17,
Even when 18 is not in the maximum heating state, the rear seat priority switch provided on the air conditioning operation panel is set to ON, and the blowing mode is in one of the foot (FOOT) mode and the foot defroster (F / D) mode. At times, the warm air bypass door 22 is opened. That is, the hot air bypass door 22 is not linked to the opening and closing of the air mix doors 17 and 18 but is controlled independently.

In a vehicle having a large indoor space such as an RV car, the vicinity of the rear seat is less likely to be warmed than the vicinity of the front seat. The temperature near the front seat is appropriate, but the temperature near the rear seat is low,
When it is necessary to preferentially heat the vicinity of the rear seat, the occupant sets the rear seat priority switch to ON. Then, the front seat side is supplied with hot air at an appropriate temperature via the cold / hot air mixing space 20, and the rear seat side is supplied with hot air passing through the heater core 13 directly through the hot air bypass inlet 21. . As a result, the front seat side can be maintained at an appropriate temperature, and the rear seat side can be further warmed. On the rear seat side, the warm air that has passed through the heater core 13 is directly supplied to the rear seat foot opening 33, so that the ventilation resistance of the air passage is reduced, and the amount of warm air is prevented from decreasing, thereby increasing the heating efficiency. ing.

(Second Embodiment) In the first embodiment, opening and closing of the hot air bypass door 22 is controlled by the control routine shown in the flowchart of FIG. 13, and the rear seat side is preferentially heated. In the second embodiment, it is possible to adjust the ratio of priority heating on the rear seat side by adding the following configuration.

In the second embodiment, a rear seat temperature setting adjusting member is provided on the air conditioning operation panel. Other configurations are the first
This is the same as the embodiment. In the second embodiment, the occupant sets the ratio of the priority heating of the rear seat. Thereby, when the temperature difference between the front seat and the rear seat is large, the hot air bypass door 2
2 is controlled so that the opening degree of the hot air bypass door 22 is reduced when the temperature difference is small.

FIG. 14 shows a state in which the air mix doors 17 and 18 are operated from the maximum heating state to the intermediate opening position for controlling the temperature of the blown air in the foot blowout mode, and are provided on the air conditioning panel. The rear seat priority switch is set to ON, and the priority heating ratio is set by the rear seat temperature setting adjustment member. The operation of the second embodiment is the same as that of the first embodiment except for the hot air bypass door 22. In the air-conditioning electronic control device 50, the energization of the servo motor 55 is controlled in accordance with the temperature control calculation value SW based on a signal from the rear seat temperature setting adjustment member and a map stored in advance in the ROM. Determine the motor rotation angle.

When the hot air bypass door 22 is at the intermediate opening position, the hot air supplied directly to the rear seat foot opening 33 after passing through the heater core 13 is restricted, and the hot air passing through the cold / hot air mixing space 20 is restricted. Part of the wind also has a rear seat foot opening 33
Supplied to Then, they are mixed and the warm air is blown out from the rear seat foot outlet through the rear seat foot duct (not shown) to the feet of the occupant on the rear seat side.

In the second embodiment, the hot air bypass door 22
The degree of opening can be adjusted by the operation of the rear seat temperature setting adjusting member by the occupant. Therefore, the temperature of the hot air supplied to the rear seat can be finely adjusted according to the temperature difference between the front seat side and the rear seat side. In the above-described second embodiment, the case of the foot blowing mode has been described. However, the operation and effect of the hot air bypass door 22 are the same in the case of the foot defroster blowing mode.

(Other Embodiments) In the first and second embodiments, the doors 4, 5, 17, 18, 22, 22,
The case where the operations of 6 and 31 are performed by an actuator such as a servomotor via a link mechanism has been described. Each of the doors may be operated by a manual operation force applied to the door.

The maximum heating time when 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 and second embodiments, the change to the mode in which the rear seat side is preferentially heated is performed by setting the rear seat priority switch provided on the air conditioning panel to ON. However, switching to the rear seat priority mode may be performed automatically. For example, temperature sensors may be provided on all the seat sides and the rear seat side, and the rear seat priority mode may be set when the temperature difference between them becomes a predetermined value or more.

In the first and second embodiments, the evaporator (cooling heat exchanger) 12 is provided in the air conditioning unit 100. However, the air conditioner does not have the cooling heat exchanger. It goes without saying that the present invention can be similarly applied to an apparatus. In the first and second embodiments, the air mixing doors 17 and 18 adjust the heating amount of the conditioned air by the heater core 13 to adjust the air temperature, and adjust the air flow ratio between the cold air and the hot air. Using
Instead of the air mix doors 17 and 18, the heater core 1
The present invention is similarly applicable to an air conditioner of a type that uses a hot water valve that adjusts the flow rate or temperature of hot water flowing into the hot water supply 3 and adjusts the air temperature by adjusting the hot water flow rate (or hot water temperature) of the hot water valve. Can be applied.

In the first and second embodiments, the passage of the conditioned air is divided into the first air passage 8 on the inside air side and the second air passage 9 on the outside air side.
A description has been given of the vehicle air conditioner in which the warmed high-temperature air is recirculated and blown out from the outlets 9 and 33, while low-humidity outside air is blown out from the defroster opening 25.
However, the present invention is not limited to the above type of air conditioner, but can be applied to a type in which the air passages for the inside and outside air are not formed.

[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 showing a state of a normal mode in a foot blowing mode in a rear seat priority mode of the embodiment.

FIG. 11 is a sectional view showing a state of a normal mode in a foot defroster blowing mode in a rear seat priority mode of the embodiment.

FIG. 12 is a system diagram of electric control of the embodiment.

FIG. 13 is a flowchart of electric control of the hot-air bypass door of the embodiment.

FIG. 14 is a cross-sectional view illustrating a state of a normal mode in a foot blowing mode in a rear seat priority mode according to the second embodiment.

[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.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroaki Shiraishi 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Makoto Umebayashi 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Denso Corporation F-term (reference) 3L011 CP03

Claims (3)

[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 front seat foot opening (29) that blows wind toward the feet of the front passengers in the vehicle compartment, and a rear seat foot outlet that blows wind toward the feet of the rear passengers in the vehicle compartment. Rear foot opening to be connected (33)
And a first warm air passage (1) for guiding the warm air that has passed through the heating heat exchanger (13) toward the two foot openings (29, 33).
9a), the hot air that has passed through the heating heat exchanger (13)
A second hot air passage (30) which bypasses the hot air passage (19a) directly to the rear seat foot opening (33), and an inlet (21) of the second hot air passage (30). And a warm air bypass door (22) that opens and closes the rear seat side over the front seat side in a blowing mode in which the two foot openings (29, 33) are simultaneously opened. When the heating mode is set, the hot air bypass door (22) is opened, and the hot air that has passed through the heating heat exchanger (13) is directly sent to the second hot air passage (30). An air conditioner for a vehicle, wherein the air conditioner is guided. 2. A defroster opening (2) connected to a defroster outlet for blowing air toward an inner surface of a vehicle window glass.
5), and in the blowing mode in which both the foot openings (29, 33) and the defroster openings (25) are simultaneously opened, the first air passage (8) ) And a second air passage (9) through which outside air flows, and the first air passage (8) communicates with the two foot openings (29, 33) and the second air passage (9). ) Can be set in a two-layer flow mode in which the hot air bypass door (22) opens the inlet part (21) when the two-layer flow mode is set. ,
The vehicle air conditioner according to claim 1, wherein the first air passage (8) and the second air passage (9) are defined. 3. The method according to claim 1, wherein the setting of the mode for heating the rear seat side preferentially is performed by manually switching a switch (52) provided in the vehicle. Vehicle air conditioner.