JP2003104028A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To direct heating capability of the whole of a heater core 13 to a rear seat side when requiring maximum heating capability on the rear seat side, in an air conditioner for a vehicle capable of independently controlling a blow-off air temperature on the front seat side/rear seat side. SOLUTION: This air conditioner is constituted of a cold air side air mix door 16 for a front seat for opening/closing a cold air bypass passage 15 for a front seat and a hot air side air mix door 33 for a front seat for opening/ closing a hot air passage 31 for a front seat on an air downstream side of the heater core 13. The cold air side air mix door 16 for the front seat does not close a reheating air passage 30 to the heater core 13 at even a maximum cooling side position. As a result, when requiring the maximum heating capability on the rear seat side, the whole quantity of hot air passing through the heater core 13 is directed to a hot air passage 32 for a rear seat by closing the hot air passage 31 for the front seat by the hot air side air mix door 33 for the front seat and interrupting the supply of hot air to the front seat side, and thereby heating capability of the whole of the heater core 13 can be directed to the rear seat side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a vehicle air conditioner capable of independently controlling the temperature of air blown to the front seat side and the temperature of air blown to the rear seat side.

[0002]

2. Description of the Related Art The applicant of the present invention has previously disclosed a technique disclosed in Japanese Patent Application Laid-Open No. 2000-62442 as a vehicle air conditioner capable of independently controlling the temperature of blown air on the front seat side and the rear seat side in a vehicle compartment. I am applying.

In the vehicle air conditioner disclosed in this publication, one heat exchanger common to the front seat side and the rear seat side is provided in the air conditioning case as a heat exchanger for heating, and the air of the heat exchanger for heating is provided. A partition wall that divides the air flow path of the heating heat exchanger into a front seat flow path and a rear seat flow path on the inlet side, and a rear seat flow path on the air outlet side of the heating heat exchanger. The air-mixing door that adjusts the air flow rate ratio between the hot air passing through the heating heat exchanger and the cold air bypassing the heating heat exchanger, as well as arranging the switching door that switches between the rear seat side and the The front and rear seats are installed independently.

[0004]

In the above-mentioned prior art, since the switching door is provided on the air outlet side of the heating heat exchanger, the heating heat exchanger is used when the maximum heating capacity is desired on the front seat side. It is possible to direct the heating capacity of the entire heating heat exchanger to the front seat side by operating the switching door so that the part of the exchanger that was used as the rear seat flow passage is included in the front seat flow passage. It was

However, since the heating capacity to the rear seat side cannot be increased beyond the capacity of the part partitioned by the partition wall as the rear seat flow path, the temperature of air blown to the rear seat side cannot be controlled independently. However, the heating capacity was not sufficient.

The present invention has been made in view of the above-mentioned prior art, and an object thereof is to increase the heating capacity of the entire heat exchanger for heating in the rear seat when the maximum heating capacity in the rear seat is desired. An object is to provide a vehicle air conditioner that can be turned to the side.

[0007]

In order to achieve the above object, the present invention employs the following technical means.

According to the first aspect of the present invention, the front seat temperature adjusting means (16) is provided with the front seat cold air side air mix door (16) for opening and closing the front seat cold air bypass passage (15) and the heating heat. The warm air passage for the front seat (3
Warm air side air mix door (33) for the front seat that opens and closes 1)
And the cold air side air mix door (16) for the front seat is provided so as not to block the reheated air passage (30) leading to the heating heat exchanger (13) even when it is in the maximum cooling side position. It is characterized by that.

As a result, when the maximum heating capacity is desired on the rear seat side, the warm air side air mix door (33) for the front seat is provided.
The hot air passage (31) for the front seat is closed by shutting off the supply of the hot air to the front seat side so that the total amount of hot air that has passed through the heat exchanger (13) for heating is the hot air passage for the rear seat. As it goes to (32), the heating capacity of the entire heating heat exchanger (13) can be directed to the rear seat side.

Further, the entire amount of warm air that has passed through the heating heat exchanger (13) can be used, and the opening ratio of the warm air side air mix door (33) for the front seat and the air mix door (35) for the rear seat. By changing the amount of warm air distributed to the front seats and rear seats to adjust the temperature of each blown air, the amount of blown conditioned air on the rear seats, especially the conditioned air mixed with warm air It is possible to increase the blowout amount of.

According to the second aspect of the invention, when the front seat side is in the maximum cooling state, the warm air side air mix door for the front seat (3
3) is a position where the warm air passage (31) for the front seat is closed.

The fact that the front seat side is in the maximum cooling state means that the front seat side does not require the warm air that has passed through the heating heat exchanger (13), and therefore the front seat warm air side air mix door (3
By setting 3) to the position where the warm air passage for the front seat (31) is closed, the blown air temperature can be adjusted on the rear seat side by using the total amount of the warm air that has passed through the heating heat exchanger (13). It is possible to increase the amount of conditioned air on the rear seat side, particularly the amount of conditioned air mixed with warm air.

According to the third aspect of the invention, when the cooling and heating on the rear seat side is prioritized, the cold air side air mix door for the front seat (1
6) is a position for closing the front cold air bypass passage (15), and the front warm air side air mix door (33) is for closing the front warm air passage (31). To do.

As a result, the front cold air bypass passage (1
The cold air supplied from 5) is blocked by the cold air side air mix door (16) for the front seat, and the hot air supplied from the warm air passage (31) for the front seat is warm air side air mix door (33) for the front seat. ) To shut off. As a result, the blowout openings for the front seats (21, 25, 2
The conditioned air blown out from 6) to the front seat side is completely blocked by both air mix doors (16, 33), and passes through the cooling heat exchanger (12) and the heating heat exchanger (13). Since all of the warm air is directed to the rear seat side, the vehicle air conditioner completely performs cooling / heating with the rear seat side as the rear seat air conditioner.

In a fourth aspect of the invention, the defroster mode in which air is blown toward the inner surface of the vehicle window glass from the defroster blowout opening (21) which is one of the blowout openings for the front seats, as the blowout mode on the front seat side. And defroster mode signal means (61) for outputting a signal indicating that the defroster mode has been selected, and rear seat priority signal means for outputting a signal indicating that the rear seat cooling / heating is prioritized over the front seat cooling / heating. (63), first air mix door driving means (67) for driving the cold air side air mix door (16) for the front seat, and second air mix for driving the warm air side air mix door (33) for the front seat. Signals from the door driving means (68), the defroster mode signal means (61) and the rear seat priority signal means (63) are input to the first and second air mix door driving means (67, 68). Gosuru control means (50) and provided with,
The control means (50) receives the signal from the rear seat priority signal means (63) and also receives the defroster mode signal means (6).
When the signal from 1) is not input, the cold air side air mix door (16) for the front seat is connected to the cold air bypass passage (15) for the front seat through the first and second air mix door drive means (67, 68). And the front warm air side air mix door (33) is positioned to close the front warm air passage (31).

As a result, when the control means (50) receives a signal from the rear seat priority signal means (63) indicating that priority is given to cooling and heating on the rear seat side, the front seat blowing opening portion (the same as in claim 3). The air-conditioning air blown out from the front side of the seats (21, 25, 26) is completely shut off by the air mix doors (16, 33), and the cooling heat exchanger (12) and the heating heat exchanger (13) are Since all of the cold air and hot air that have passed pass toward the rear seat side, the vehicle air conditioner completely performs air conditioning as the rear seat air conditioner by giving priority to the rear seat side.

However, the defroster mode for clearing the frost of the window glass is selected as the blowing mode on the front seat side,
The defroster mode signal means (61) is added to the control means (50).
While the signal from is input, this is given top priority for safety and the defroster mode on the front seat side is established to prevent the above-mentioned rear seat side priority blowing. By the way,
The reference numerals in parentheses of the above-mentioned means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a part of an air conditioning unit 10 according to the present embodiment. A ventilation system of a vehicle air conditioner according to the present embodiment is roughly divided into two parts, a blower unit (not shown) and an air conditioning unit 10. There is. The blower unit is arranged offset from the central part to the passenger seat side in the lower part of the instrument panel in the passenger compartment, while the air conditioning unit 10 is arranged in the lower part of the instrument panel in the passenger compartment in the left-right direction of the vehicle. It is located in the approximate center.

As is well known, the blower unit comprises an inside / outside air switching box for selectively introducing inside air (air inside the vehicle) and outside air (air outside the vehicle), and a blower for sucking and blowing air through the inside / outside air switching box. ing. The air-conditioning unit 10 is of a type in which both an evaporator (cooling heat exchanger) 12 and a heater core (heating heat exchanger) 13 are integrally incorporated in one common air-conditioning case 11. The air-conditioning case 11 is made of a resin such as polypropylene having a certain degree of elasticity and being excellent in strength.

The air-conditioning case 11 is specifically composed of a plurality of divided cases. The plurality of divided cases accommodate the heat exchangers 12 and 13 and devices such as doors described later, and then metal spring clips, screws and the like. The air conditioning unit 10 is configured by being integrally connected by the fastening means. The air conditioning unit 10 part is arranged in the form shown in FIG. 1 in the front-rear direction and the up-down direction of the vehicle. An air inlet 14 is formed on the side surface of the air-conditioning case 11 that is closest to the front of the vehicle. The conditioned air blown from the blower unit described above flows into the air inlet 14.

An evaporator 12 is arranged in the air conditioning case 11 immediately after the air inlet 14. This evaporator 1
2 is a thin type in the vehicle front-rear direction and is vertically arranged so as to cross the passage in the air-conditioning case 11. Therefore, the blown air from the air inlet 14 flows into the front surface of the evaporator 12 extending in the vehicle vertical direction. As is well known, the evaporator 12 absorbs latent heat of vaporization of the refrigerant of the refrigeration cycle from the conditioned air to cool the conditioned air.

A heater core 13 is arranged on the downstream side of the air flow of the evaporator 12 (on the rear side of the vehicle) at a predetermined interval. The heater core 13 is arranged on the lower side in the air conditioning case 11 so as to be inclined toward the vehicle rear side. Although not shown, the evaporator 12 and the heater core 13
The width dimension of the vehicle in the left-right direction is designed to be substantially equal to the width dimension of the air conditioning case 11.

The heater core 13 reheats the cold air passing through the evaporator 12, hot hot water (engine cooling water) flows therein, and heats the air by using this hot water as a heat source. In the air passage in the air conditioning case 11, a front seat cold air bypass passage 15 for bypassing the heater core 13 and allowing air (cold air) to flow is formed above the heater core 13.

Further, a flat air-conditioning air-mixing door 16 for the front seat (cooling means for the front seat) 16 is arranged between the heater core 13 and the evaporator 12. The cold air side air mix door 16 for the front seat opens and closes the cold air bypass passage 15 for the front seat, and at the same time, the cold air bypass passage 15 for the front seat.
The flow rate of the cold air that bypasses the heater core 13 is adjusted.

The cold air side air mix door 1 for the front seats
6, the maximum cooling side position (MAX.CO
The reheated air passage 30 leading to the heater core 13 is not blocked even when it is set to OL.

The cold air side air mix door 16 for the front seat is integrally connected to a rotary shaft 17 arranged in the horizontal direction (vehicle width direction), and is rotatable around the rotary shaft 17 in the vertical direction of the vehicle. Has become.

The rotary shaft 17 is rotatably supported by the air conditioning case 11, and one end of the rotary shaft 17 projects outside the air conditioning case 11 to use a servomotor or the like via a link mechanism (not shown). The actuator mechanism is adapted to adjust the rotational position of the cold air side air mix door 16 for the front seat.

On the other hand, in the air conditioning case 11, a wall surface 18 extending vertically is formed integrally with the air conditioning case 11 at a portion on the air downstream side of the heater core 13 (rear side of the vehicle) with a space between the heater core 13 and the heater core 13. Has been done. The wall surface 18 forms a hot air passage 19 that extends vertically from immediately after the heater core 13 (on the downstream side of the air), and an upper side of the hot air passage 19 supplies warm air to the front seat side. The passage 31 is formed, and the lower side is a rear seat warm air passage 32 that supplies warm air to the rear seats.

At the entrance of the warm air passage 31 for the front seat, a flat air-mix door for the warm air for the front seat (front seat temperature adjusting means) 33 is arranged. The front-seat warm air side air mix door 33 opens and closes the front-seat warm air passage 31 and adjusts the amount of warm air supplied to the front-seat warm air passage 31 to the front seat side.

The front cold air side air mix door 16 adjusts and shuts down the cold air quantity, and the front warm air side air mix door 33 adjusts and shuts off the warm air quantity, whereby the front seat. As the side temperature adjusting means, the temperature of blown air toward the front seat of the passenger compartment is adjusted.

Further, both of the above air mix doors 16 and 3 are
By adopting the structure of No. 3, when the maximum heating capacity on the rear seat side is desired, the warm air passage 31 for the front seat is closed by the warm air side air mix door 33 for the front seat, and the warm air to the front seat side is closed. By shutting off the supply of the hot air to the rear seats, all of the warm air that has passed through the heater core 13 is directed to the rear seat warm air passage 3), and the heating capacity of the entire heater core 13 can be directed to the rear seat side.

The warm air side air mix door 33 for the front seat is integrally connected with a rotary shaft 34 arranged in the horizontal direction (vehicle width direction), and is rotatable around the rotary shaft 34 in the vertical direction of the vehicle. It has become.

The rotary shaft 34 is rotatably supported by the air conditioning case 11, and one end of the rotary shaft 34 projects outside the air conditioning case 11, and a servomotor or the like is used via a link mechanism (not shown). The actuator mechanism is adapted to adjust the turning position of the warm air side air mix door 33 for the front seat.

The front warm air passage 31 for the front seat is provided with the heater core 1
In the upper part of 3, the front seat cold air bypass passage 15 joins with the downstream side to form a front seat air mixing portion 20 for mixing the cold air and the warm air.

Then, on the upper surface of the air conditioning case 11, the defroster opening 2 into which the temperature-controlled conditioned air from the front air mixing portion 20 flows into a portion near the front of the vehicle.
1 is open. The defroster opening 21 is connected to a defroster outlet through a defroster duct (not shown), and blows wind from the defroster outlet toward the inner surface of the vehicle front window glass.

The defroster opening 21 is opened and closed by a flat defroster door 22. This defroster door 22
Is rotated by a rotary shaft 23 arranged horizontally in the vicinity of the upper surface of the air conditioning case 11. The defroster door 22 switches between the defroster opening 21 and the communication port 24 to open and close. The communication port 24 serves as a passage for flowing the conditioned air from the air mixing unit 20 toward the front seat face opening 25 and the front seat foot opening 26 described later.

A front seat face opening 25 is provided on the upper surface of the air conditioning case 11 at a position rearward of the vehicle (closer to the occupant) than the defroster opening 21. The front seat face opening 25 is shown in the drawing. Not connected to the front seat face air outlet located on the upper side of the instrument panel through the front seat face duct, and the wind is directed from the front seat face air outlet toward the front seat passenger's head in the vehicle compartment. Blow out.

Next, in the air conditioning case 11, a front seat foot opening 26 is provided below the front seat face opening 25. The front seat foot openings 26 are opened on the left and right side surfaces of the air conditioning case 11, and pass through the front seat foot outlets (not shown) on the left and right sides of the front passenger seat and the passenger seat feet. Blow air into.

A flat face / foot switching door 27 is rotatably disposed between the openings 25, 26 by a rotary shaft 28. The face / foot switching door 2
7, the front opening 25 for the front seat and the entrance 26a of the foot opening 26 for the front seat are switched and opened.

Here, the defroster door 22 and the face
The foot switching door 27 is a front seat blowing mode switching means, and its rotating shafts 23 and 28 are connected to a blowing mode switching actuator mechanism such as a servo motor via a link mechanism (not shown). The doors 22 and 27 are interlocked by this actuator mechanism.

Next, inside the air-conditioning case 11, a rear seat cold air bypass passage 29 is formed in the lower part of the heater core 13 for allowing the cool air from the outlet of the evaporator 12 to bypass the heater core 13.

A flat rear seat air mix door 35 is rotatably disposed by a rotary shaft 36 at the confluence of the rear seat warm air passage 32 and the rear seat cold air bypass passage 29. The rear seat air mix door 35 adjusts the air volume ratio between the warm air from the rear seat warm air passage 32 and the cool air from the rear seat cold air bypass passage 29 to control the temperature of the air blown to the rear seat side of the passenger compartment. A rear seat temperature adjusting means for adjusting is configured. Warm air from the rear seat warm air passage 32 and the rear seat cold air bypass passage 2
The cool air from 9 is mixed in the rear seat air mixing section 37 to become air having a desired temperature.

The rotary shaft 36 is arranged in the horizontal direction (vehicle width direction), and one end of the rotary shaft 36 projects to the outside of the air conditioning case 11 to form an independent actuator mechanism using a servo motor or the like via a link mechanism (not shown). The actuator mechanism is connected and the rotational position of the rear seat air mix door 35 is adjusted.

The air of the desired temperature mixed in the rear seat air mixing section 37 flows toward the downstream side (rear side of the vehicle), and flows from the rear seat outlet opening 38 through a connection duct (not shown) to the rear seat face. From the outlet or the foot outlet for the rear seat, blow out to the head side or the foot side of the rear seat occupant.

FIG. 2 is a block diagram showing an outline of electric control in this embodiment, which is an electronic control unit for air conditioning (EC
U) 50 automatically controls various air conditioners. The ECU 50 is composed of a microcomputer and the like, and has a blower unit and an air conditioning unit 1
It controls various air-conditioning equipment installed in No. 0 according to a preset program. The ECU 50 is supplied with power from a vehicle battery (not shown) when an ignition switch (not shown) of the automobile engine is turned on.

The ECU 50 includes sensor signals from a well-known sensor group 51, a front-seat operation panel 52 for air conditioning installed on the instrument panel portion in the front of the vehicle compartment, and an air-conditioning panel installed on the rear seat side of the vehicle compartment. An operation signal is input from the rear seat side operation panel 53. As is well known, the sensor group 51 includes an outside air temperature sensor 54 that detects an outside temperature (outside air temperature) of the vehicle interior, an inside air temperature sensor 55 that detects an inside temperature (inside air temperature) of the vehicle interior, and a solar radiation sensor that detects an amount of solar radiation into the vehicle interior. 56, a post-evaporator temperature sensor 57 that detects the temperature of air blown from the evaporator 12, and the heater core 1
A water temperature sensor 58 and the like for detecting the hot water temperature to 3 are provided.

On the front seat side operation panel 52, a front seat side temperature setting device 59, an air volume setting device 60, and a front seat blowing mode setting device 6 are provided.
1, an inside / outside air mode setting device 62 and the like, and a rear seat side temperature setting device 64 is provided on the rear seat side operation panel 53. Further, in the present embodiment, the rear seat priority air-conditioning switch (rear seat priority signal means) 6 that issues a signal to the front seat operation panel 52 indicating that the rear seat cooling / heating is prioritized over the front seat cooling / heating.
Equipped with 3.

Next, as drive means for various air conditioners controlled by the ECU 50, a drive motor 65 for an inside / outside air switching door (not shown), a drive motor 66 for a blower fan (not shown), and the cold air side air mix door 16 for the front seat. Actuator mechanism drive motor 67, front seat warm air side air mix door 33 actuator mechanism drive motor 6
8, a drive motor 69 for the actuator mechanism of the front seat blowing mode doors 22, 27, a rear seat air mix door 35
A driving motor 70 for the actuator mechanism is provided.

Next, the operation of the present embodiment having the above-described structure will be described. In the vehicle air conditioner of the present embodiment, the defroster door 22 and the face / foot switching door 27, which are the door means for switching the blowing modes, and the front The following blowing modes can be set by selecting the operating positions of the cold air side air mix door 16 for the front seat and the warm air side air mix door 33 for the front seat, which form the door means of the temperature adjusting means for the seat.

(1) Face blowing mode Signal from front side blowing mode setting device 69 or EC
When the face blowout mode is selected based on the blowout mode calculation result in U50, the defroster door 22 is operated to the position shown by the solid line in FIG. 1 to close the defroster opening 21 and fully open the communication port 24. Further, the face / switching door 27 is operated to the position shown by the solid line in FIG. 1 to close the entrance 26a of the front seat foot opening 26.

At this time, the cold air side air mix door 1 for the front seats
6 and the warm air side air mix door 33 for the front seat are operated to the positions shown by the solid lines in FIG. 1, the warm air from the warm air passage 31 for the front seat is closed by the warm air side air mix door 33 for the front seat, A maximum cooling state in which the cold air bypass passage 15 is fully opened is set. In this state, when the blower unit and the refrigeration cycle are operated, the blown air from the blower unit flows in through the air inlet 14 and is then cooled by the evaporator 12 to become cold wind.

In the maximum cooling state, the cold air as it is passes through the cold air bypass passage 15 for the front seats, the air mixing portion 20 for the front seats, and the face opening portion 25 for the front seats through the communication port 24.
Toward the front passenger's head, cold air blows out toward the front passenger's head.

On the other hand, the rear seat air mix door 35 is shown in FIG.
Is operated to the position indicated by the solid line, the air flow in the warm air passage 32 for the rear seat downstream of the heater core 13 is shut off.
The cold air from the exit is the same, and the cold air bypass passage 2 for the rear seats
After passing through 9, the air flows toward the rear seat blowing opening 38, and the cool air is blown from the rear seat face outlet toward the head of the rear passenger.

In order to control the temperature of the air blown into the passenger compartment, the cold air side air mix door 16 for the front seat and the warm air side air mix door 33 for the front seat are moved from the solid line position (maximum cooling position) in FIG. 1 to the intermediate opening position. When the operation is performed, most of the cool air passes through the front seat cold air bypass passage 15 according to the opening positions of the front seat cold air side air mix door 16 and the front seat warm air side air mix door 33, and a part of the remaining portion. The cold air flows into the heater core 13 from the reheating air passage 30 to be heated, becomes warm air, and flows out to the warm air passage 19. Then, according to the opening position of the warm air side air mix door 33 for the front seat, the hot air passage 31 for the front seat flows,
Cold air in the front cold air bypass passage 15 and hot air passage 3 for the front seat
The warm air from 1 is mixed in the front seat air mixing section 20,
Adjust to desired temperature.

Similarly, on the rear seat side, when the rear seat air mix door 35 is operated from the solid line position (maximum cooling position) in FIG. 1 to the intermediate opening position, the rear seat air mix door 3
According to the opening position of 5, the air volume ratio between the cool air from the rear seat cold air bypass passage 29 and the warm air from the rear seat warm air passage 32 can be adjusted, and the cool air and the warm air are mixed in the rear seat air mixing section 37. Can be mixed and adjusted to the desired temperature.

Therefore, the cold air side air mix door 1 for the front seats
6 by controlling the operation positions (rotational positions) of the warm air side air mix door 33 for the front seat 6 and the air mix door 35 for the rear seat, respectively, so that the face blowout air temperatures of the front seat side and the rear seat side are independently controlled. You can control.

Further, the entire amount of warm air that has passed through the heater core 13 can be used, and depending on the opening ratio of the warm air side air mix door 33 for the front seat and the air mix door 35 for the rear seat, the front seat side and the rear seat side can be selected. By providing a structure in which the amount of warm air to be distributed is changed and the temperature of each blown air can be adjusted, the amount of conditioned air on the rear seat side, in particular, the amount of conditioned air mixed with warm air can be increased.

(2) Bi-level blowout mode The defroster door 22 is operated to the solid line position in FIG. 1, and the face / foot switching door 27 is operated to an intermediate position between the solid line position and the one-dot chain line position in FIG. Both the seat face opening 25 and the entrance 26a of the front seat foot opening 26 are opened.

Since the bi-level blow-out mode is usually used in the middle season of spring and autumn, the cold air side air mix door 16 for the front seats and the warm air side air mix door 33 for the front seats are operated to the intermediate opening position and desired. The temperature-adjusted wind blows out from both the front seat face opening 25 and the front seat foot opening 26 to the upper and lower sides of the front seat of the passenger compartment at the same time. Further, by operating the rear seat air mix door 35 to the intermediate opening position, the wind adjusted to the desired temperature can be blown out from the rear seat blowout opening portion 38 to the rear seat side of the passenger compartment. .

(3) Foot blowing mode The defroster door 22 is operated from the position shown by the solid line in FIG. 1 to a position where the defroster opening 21 is opened by a small amount and the communication port 24 is opened (almost fully opened). The face / foot switching door 27 is operated to the position indicated by the alternate long and short dash line in FIG. 1 to close the front seat face opening 25 and fully open the entrance 26a of the front seat foot opening 26.

At this time, the cold air side air mix door 1 for the front seats
6 and the warm air side air mix door 33 for the front seat are operated to the position indicated by the alternate long and short dash line in FIG. 1, the cold air bypass passage 15 for the front seat is fully closed and the warm air flow passage 31 for the front seat is fully opened to set the maximum heating state. To be done. In this state, the blown air from the blower unit flows in from the air inlet 14, then passes through the evaporator 12 and flows into the heater core 13 from the reheating air passage 30 to be heated and becomes warm air.

This warm air passes through the warm air side air mix door 33 for the front seat, rises in the warm air passage 31 for the front seat to reach the air mixing portion 20 for the front seat, and from there, through the communication port 24, to the front. The warm air blows toward the seat foot opening 26, and from here toward the feet of the front passengers.

At this time, the rear air mix door 3
5 is operated to the position indicated by the alternate long and short dash line in FIG. 1 to fully close the rear seat cold air bypass passage 29 and fully open the rear seat warm air passage 32, the hot air heated by the heater core 13 becomes the rear seat warm air. The hot air is blown from the rear seat blowing opening 38 through the passage 32 and the rear seat air mixing portion 37 to the foot portion of the rear seat passenger through the rear seat foot outlet.

The cold air side air mix door 16 for the front seats, the warm air side air mix door 33 for the front seats, and the air mix door 35 for the rear seats are respectively set at arbitrary intermediate openings from the one-dot chain line position (maximum heating position) in FIG. When operated to the position, it is possible to independently adjust the mixing ratio of cold air and warm air on both the front seat side and the rear seat side, so that the blown air temperature on the front seat side and the rear seat side can be adjusted independently. You can control.

In the foot blowing mode, on the front seat side, the ratio of the blowing air amount from the defroster opening 21 to the blowing air amount from the front seat foot opening 26 is usually about 2 to 8. If the defroster door 22 is operated to a position where the degree of opening of the defroster opening 21 increases and the degree of opening of the communication port 24 decreases compared to the case of the foot blowout mode, the amount of air blown out from the defroster opening 21 and the front seats. The ratio with the amount of air blown from the foot opening 26 can be set to about 5: 5.

As a result, it is possible to set the foot / defroster blowing mode, which has a higher effect of preventing the window glass from being fogged than the foot blowing mode.

(4) Defroster blowout mode The occupant operates the front seat side blowout mode setting device (defroster mode signal means) 69 to select the defroster mode, and a signal indicating that the defroster mode is selected is sent to the ECU.
At 50, the ECU 50 opens the defroster door 22 as shown in FIG.
The defroster opening 21 is fully opened and the communication port 24 is closed by operating to the position indicated by the alternate long and short dash line.

Then, the cold air side air mix door 1 for the front seats
6 and the warm air side air mix door 33 for the front seat are operated to the one-dot chain line position (maximum heating position) in FIG. 1, after heating the entire amount of the blown air from the blower unit by the heater core 13,
The warm air passes through the warm air side air mixing door 33 for the front seats and rises in the warm air passage 31 for the front seats to move to the air mixing portion 20 for the front seats.
From here, through the defroster opening 21, from the defroster outlet to the window glass of the vehicle,
Anti-fog on the front window glass.

At this time, the rear seat air mix door 3
When 5 is operated to an arbitrary intermediate opening position, the air volume of the cool air from the rear seat cold air bypass passage 29 and the warm air from the rear seat warm air passage 32 according to the opening position of the rear seat air mix door 35. The ratio can be adjusted, and the cool air and the warm air are mixed in the rear seat air mixing section 37 to adjust the temperature to a desired temperature, and then the rear seat blow-out opening portion 38 is passed through the rear seat blow-out opening toward the rear seat passengers. Blown out.

(5) Rear seat priority blowing mode A rear seat priority blowing mode is a characteristic blowing mode in this embodiment. This is selected by turning on the rear seat priority air conditioning switch (rear seat priority signal means) 63 provided on the front seat operation panel 52 when the passenger wants to give priority to the rear seat side cooling / heating over the front seat side.

When a signal from the rear seat priority air-conditioning switch 63 is input to the ECU 50, the cold air side air mix door 16 for the front seat is provided.
1 to the position for closing the front seat cold air bypass passage 15 at the one-dot chain line position in FIG. 1, and for closing the front seat warm air side air mix door 33 at the position for closing the front seat warm air passage 31 in the solid line position in FIG. To operate.

As a result, the cold air bypass passage 15 for the front seats is provided.
The cold air supplied from the front seat is the cold air side air mix door 1
The hot air supplied from the front seat warm air passage 31 is blocked by the front seat warm air side air mix door 33.

That is, the front-seat outlet openings 21, 25, 2
Air-conditioned air that blows out from 6 to the front seat side is completely shut off by both air mix doors 16 and 33, and all of the cold air / warm air that has passed through the evaporator 12 and the heater core 13 is directed to the rear seat side. The air conditioner will completely perform air conditioning as a rear seat air conditioner with priority given to the rear seat side.

However, the defroster mode for clearing the window glass is selected as the blowing mode, and the ECU 5
While the signal indicating it from the front seat blowing mode setting device 69 is input to 0, this is prioritized for safety and the front seat side defroster mode is established so that the rear seat side prioritized blow-out does not occur. It has become.

(Other Embodiments) In the above-described embodiment, the rear seat air mix door 35 is connected to the rear seat outlet opening 38 through the connecting duct to form the rear seat outlet. A shut door is provided in the part to shut off the ventilation to the rear seat side when the air blowing to the rear seat is not necessary or when you want to direct the total heating capacity to the defroster outlet in the defroster mode. You may turn to the front seat side.

Further, if the structure is such that the ventilation to the rear seat side can be cut off, the rear seat priority air conditioning switch 63 in the above embodiment is replaced with a front and rear air volume ratio variable volume or the like, and the front seat side and the rear seat side are replaced. And the air flow rate ratio from 0% to 100
You may make it variable up to%.

Further, the rear seat outlet 38 is divided into a rear face outlet and a rear foot outlet, and an outlet switching door is provided at the branch point of the outlets so that both outlets can be connected depending on the outlet mode. You may make it switch.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an air conditioning unit according to an embodiment of the present invention.

FIG. 2 is a block diagram of electric control according to an embodiment of the present invention.

[Explanation of symbols]

12 Evaporator (Heat exchanger for cooling) 13 Heater core (Heat exchanger for heating) 15 Cold air bypass passage for front seat 16 Cold air side air mix door for front seat (temperature control means for front seat) 21 Defroster opening (front seat) 25 Face opening (front seat outlet opening) 26 Foot opening (front seat outlet opening) 29 Rear seat cool air bypass passage 30 Reheating air passage 31 Front seat warm air passage 32 Rear Seat warm air passage 33 Front seat warm air side air mix door (front seat temperature adjusting means) 35 Rear seat air mix door 38 Rear seat blowing opening 50 Control device (control means) 61 Front seat blowing mode Setting device (defroster mode signal means) 63 Rear seat priority air conditioning switch (rear seat priority signal means) 67 First air mix door motor (first air mix door driving means) 68 Second air mix door model Data (the second air mixing door drive means)

Claims (4)

[Claims] 1. A cooling heat exchanger (12) for cooling air.
A heating heat exchanger (13) arranged downstream of the cooling heat exchanger (12) for heating air that has passed through the cooling heat exchanger (12), and the cooling heat exchanger The cold air bypass passage (15) for the front seat, in which the cool air cooled in (12) bypasses the heating heat exchanger (13) and the hot air passing through the heating heat exchanger (13) and A front seat temperature adjusting means (16) for adjusting an air flow rate ratio to the cold air passing through the front cold air bypass passage (15), and a front warm air passage heated by the heating heat exchanger (13) ( 31) front air outlet openings (21, 25, 26) through which air mixed with warm air supplied from the front seat cold air bypass passage (15) flows out; The cold air cooled by the heat exchanger (12) flows through the heating heat exchanger (13). The cold air bypass passage (29) for the rear seats that flows by passing, and the air flow rate ratio between the warm air that passes through the heating heat exchanger (13) and the cold air that passes through the rear seat cold air bypass passage (29) are adjusted. Rear seat air mix door (35), warm air heated by the heating heat exchanger (13) and supplied from the rear seat warm air passage (32), and the rear seat cold air bypass passage (29) In a vehicle air conditioner having a rear-seat blow-out opening (38) through which air mixed with cold air supplied from the outflow is provided, the front-seat temperature adjusting means (16) is provided in the front-seat cold-air bypass passage. A cold air side air mix door (16) for opening and closing the front seat (15), and a front seat temperature for opening and closing the front hot air passage (31) on the air downstream side of the heating heat exchanger (13). Along with the wind side air mix door (33), The cold air side air mix door (16) for the front seat is provided so as not to block the reheat air passage (30) leading to the heating heat exchanger (13) even when it is at the maximum cooling side position. A vehicle air conditioner. 2. The warm air side air mix door (33) for the front seat is positioned to close the warm air passage (31) for the front seat when the front seat side is in the maximum cooling state. The vehicle air conditioner according to Item 1. 3. When prioritizing cooling / heating on the rear seat side, the cold air side air mix door (16) for the front seat is set to a position where the cold air bypass passage (15) for the front seat is closed and the front seat is provided. The vehicle air conditioner according to claim 1 or 2, wherein the warm air side air mix door (33) is set to a position where the warm air passage (31) for the front seat is closed. 4. A defroster blowout opening (21), which is one of the blowout openings for the front seat, as a blowout mode on the front seat side.
The defroster mode that blows air from the inside toward the inner surface of the vehicle window glass, the defroster mode signal means (61) that outputs a signal indicating that the defroster mode has been selected, and the cooling and heating of the rear seat side rather than the cooling and heating of the front seat Rear seat priority signal means (63) for outputting a signal indicating that it is desired to give priority, first air mix door driving means (67) for driving the cold air side air mix door (16) for the front seat, and the front seat temperature The second air mix door driving means (68) for driving the wind side air mix door (33), the defroster mode signal means (61) and the rear seat priority signal means (63) are input to receive the signals. 1
A control means (50) for controlling a second air mix door driving means (67, 68), wherein the control means (50) has the rear seat priority signal means (6).
When the signal from 3) is input and the signal from the defroster mode signal means (61) is not input,
The first and second air mix door driving means (67, 6)
8) through the cold air side air mix door for the front seat (1
6) is a position to close the front cold air bypass passage (15), and the front warm air side air mix door (33) is a position to close the front warm air passage (31). The vehicle air conditioner according to claim 3.