JPH10919A - Vehicle air conditioner - Google Patents

Abstract

(57) [Summary] [Problem] It is an object of the present invention to bring a feeling of heating of a front seat occupant closer to a heating plan for a rear seat occupant. SOLUTION: A hot air passage 7 is formed to extend upward from below. The foot air passage 11 is formed to extend from above to below on the downstream side of the hot air passage 7. A front seat foot outlet 13 is formed in the foot air passage 11, and a rear seat foot outlet 14 is formed downstream of the front seat foot outlet 13. The bypass passage 15 has one end communicating with the upstream of the warm air passage 7 downstream of the heat core 4 and the other end communicating with the rear foot foot outlet 14 downstream of the air passage 11 for foot. It is formed as follows. The bypass passage 15 is opened by the bypass door 16 in the foot mode and the foot differential mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the occupant's heating sensation in a vehicle air conditioner, and more particularly to improving the occupant's heating sensation in a rear seat occupant.

[0002]

2. Description of the Related Art A conventional vehicle air conditioner 100 is shown in FIG. The vehicle air conditioner 100 has a case 10
The evaporator 102 is disposed in the apparatus 1, and a heater core 103 is disposed in a part of a flow path on the downstream side of the evaporator 102. In the case 101, there are formed a cool air passage 104 through which the cool air passing through the evaporator 102 flows by bypassing the heater core 103, and a hot air passage 105 through which the warm air flows through the heater core 103.

[0003] The downstream side of the cold air passage 104 and the hot air passage 105 is branched into three, corresponding to well-known face outlets, foot outlets, and defroster outlets provided in the vehicle interior. Face air passage 10 that communicates
6. Foot air passage 107, defroster air passage 1
08 are formed. The foot air passage 107 is formed with a front seat foot outlet 109 for blowing conditioned air to the feet of the front seat occupant. A rear-seat foot outlet 110 for blowing conditioned air to the feet of the seat occupant is formed. Therefore, in the foot mode and the foot differential mode in which the interior of the vehicle is heated, conditioned air is blown from both the feet of the front seat occupant and the rear seat occupant to give the front seat occupant and the rear seat occupant a feeling of heating.

[0004]

By the way, the hot air passage 105 is formed so as to extend upward in the drawing after passing through the heater core 103.
The foot air passage 108 located downstream of the foot 05 is formed to extend downward. Therefore, in the foot mode, for example, the warm air that has passed through the heater core 103 flows into the rear foot foot outlet 110 in such a manner that the warm air passage 105 and the foot air passage 107 make a U-turn. .

Accordingly, the length of the flow path before the air is blown to the rear seat foot outlet 110 is increased, and the ventilation resistance is increased.
The amount of air blown from the rear-seat foot outlet 11 is reduced, and the warm air passage 105 and the foot air passage 10 are reduced.
7, the temperature of the conditioned air blown out from the rear-seat foot outlet 110 decreases due to heat loss during the U-turn flow, and sufficient heating for the rear-seat occupant compared to the front-seat occupant. There is a problem that it cannot give a feeling.

As a result, if the front seat occupant feels hot and, for example, the temperature control lever installed in the front seat of the passenger compartment is operated to lower the temperature, the rear seat occupant does not yet have a sufficient feeling of heating. There is a state. Therefore, an object of the present invention is to make the heating sensation of the front seat occupant close to the heating sensation of the rear seat occupant.

[0007]

In order to achieve the above object, according to the first to fourth aspects of the present invention, one end is located downstream of the heating heat exchanger (4), and the turn channel (7, 11) is provided.
And the other end is connected to the front seat foot outlet (1
On the downstream side of 3), a bypass passage (15) formed to communicate with the rear seat foot outlet (14), and bypass opening / closing means (16) for opening and closing the bypass passage (15).
During heating, in which warm air is blown from the front seat foot outlet (13) and the rear seat foot outlet (14), the bypass passage (15) is opened by the bypass opening / closing means (16), A portion of the warm air that has passed through the heating heat exchanger (4) through the bypass passage (15) is transferred to the rear seat foot outlet (1).
It is characterized by blowing air to 4).

Thus, at the time of heating in which warm air is blown out from the front seat foot outlet and the rear seat foot outlet, a part of the heating heat exchanger is passed through the bypass passage which bypasses the U-turn passage. Is blown to the rear seat foot outlet. Therefore, by bypassing the turn flow path, it is possible to increase the amount of air blown from the rear-seat foot outlet. Further, since the heat loss of the turn passage can be eliminated with the increase of the air volume, the temperature of the air blown out from the rear seat foot air outlet can be increased.

Further, since the amount of air blown to the rear-seat foot outlet can be increased and the temperature of the air blown from the rear-seat foot outlet can be increased, the feeling of heating of the rear-seat occupant is improved. However, as a result, the feeling of heating for the front seat occupant and the feeling of heating for the rear seat occupant can be approximated. In particular, in the third aspect of the invention, the heating heat exchanger (4) has hot water as a heat source flowing therein, and the heating heat exchanger (4) has a heat exchange for exchanging heat between hot water and air. (4b), an inlet tank (4c) provided on one end side of the heat exchange section (4b), and serving as an inlet for hot water of the heat exchange section (4b), and the other end of the heat exchange section (4b). And an outlet tank (4d), which is provided on the side of the heat exchanger and exchanges heat with air in the heat exchange section (4b) and forms an exit section of hot water of the heat exchanger. It is configured to flow linearly from the inlet tank (4c) toward the outlet tank (4d), and one end of the bypass passage opens to the inlet tank (4c) side of the heat exchange section (4b). It is characterized by having.

Thus, the heat exchange section of the heating heat exchanger is configured to flow linearly from the inlet tank to the outlet tank, so that the warm air passing through the heat exchange section on the inlet tank side is not heated. The temperature is higher than that of the warm air that has passed through the outlet tank side of the heat exchange section. Further, since one end of the bypass passage is open to the inlet tank side of the heat exchange section, the temperature of the warm air blown to the rear foot foot outlet through the bypass passage can be increased, so that the front seat is further increased. The feeling of heating for the occupant and the feeling of heating for the rear seat occupant can be made closer.

In addition, in particular, in the invention according to claim 5, there is provided rear seat occupant signal generating means (25) for generating a signal indicating that an occupant is present at the rear seat of the vehicle, and the rear seat occupant signal generating means (2) is provided.
According to 5), when a signal indicating that an occupant is present in the rear seat of the vehicle is generated, the bypass opening / closing means (16) opens the bypass passage (15).

Thus, when there is an occupant in the rear seat of the vehicle, the feeling of heating of the rear occupant can be enhanced.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. (First Embodiment) FIG. 1 shows an overall configuration diagram of an air conditioner 1 for a vehicle. FIG. 2 shows a control device 2 of the vehicle air conditioner 1.
0 shows a schematic diagram.

[0014] Vehicle air conditioner 1 according to the present embodiment.
Consists of an inside / outside air blower unit (not shown) and an air conditioner unit 2 that houses an air conditioning heat exchanger described later. The inside / outside air blowing unit is for blowing inside air or outside air to the air conditioner unit 2. The inside / outside air blowing unit is provided with an inside air introduction port, an outside air introduction port, and an inside / outside air switching door for selectively switching these introduction ports. Further, a blower for blowing inside air or outside air to the air conditioner unit 2 from the inside air introduction port or the outside air introduction port is provided in the inside / outside air blowing unit.

The air conditioner unit 2 is arranged so as to be aligned with the inside and outside air blowing unit in the vehicle width direction (the direction of the front and back in FIG. 1). Is formed. Evaporator 3 (cooling heat exchanger) for cooling the passing air inside air conditioner unit 2
And a heater core 4 (heating heat exchanger) for cooling the passing air are arranged so as to be aligned in the vehicle front-rear direction.
The air blown from the inside / outside air blower unit 1 is blown from the front of the vehicle to the rear of the vehicle in the order of the evaporator 3 and the heater core 4.

The evaporator 3 is one component of a known refrigeration cycle apparatus, and the details are omitted here. The heater core 4 uses engine cooling water (hereinafter, hot water) as a heat source, and will be described in detail later. Further, the heater core 4 is arranged in a part of the air downstream flow path of the evaporator 3. As a result, in the air conditioner unit 2, a cool air passage 6 through which the cool air cooled by the evaporator 3 bypasses the heater core 4, and a warm air passage 7 through which the warm air heated by the heater core 4 flows are formed. .

The cold air passage 6 and the hot air passage 7 are formed so as to be aligned in the vertical direction. Since the heater core 4 is arranged at a lower portion in the air conditioner unit 2, the cold air passage 6 is formed. It is located above the hot air passage 7. The air volume ratio between the cold air passage 6 and the hot air passage 7 is adjusted by an air mixing door 8 which is a mixing ratio adjusting door, and the temperature of the conditioned air is adjusted to a desired temperature by the air mixing door 8. . In this embodiment, the air mix door 8 is rotated by a servo motor 8a (see FIG. 2) as a driving unit.

As shown in FIG. 1, the hot air passage 7 is formed so as to extend upward. This is because the cold air flowing through the cold air passage 6 and the hot air flowing through the hot air passage 7 are different from each other. This is because cold air and hot air are favorably mixed by hitting each other so as to intersect at right angles. Downstream from the cool air passage 6 and the hot air passage 7, air passages 9 to 11 provided corresponding to the respective air outlets installed in the vehicle cabin are formed. Specifically, a defroster air passage 9 for blowing the conditioned air toward the inner surface of the window glass of the vehicle, a face air passage 10 for blowing the conditioned air toward the upper body of the front passenger, A foot air passage 11 for blowing conditioned air toward the feet of front and rear passengers is formed.

The foot air passage 11 is formed so that the conditioned air flows downward from above, and the front seat foot outlet 13 for blowing the conditioned air to the feet of the front occupant is provided. Is formed. Further, downstream of the front seat foot outlet 13, a rear seat foot outlet 14 for blowing conditioned air to the feet of the rear occupant is formed.

Therefore, when the warm air that has passed through the heater core 4 is blown to the front seat foot outlet 13 and the rear seat foot outlet 14, the warm air flows upward from below in the hot air passage 7. After flowing, the air is sent to the foot air passage 11 so as to make a U-turn. The rear-seat foot outlet 14 is formed downstream of the foot air passage 11, which is a flow path after the U-turn.

An extension duct (not shown) arranged to extend in the front-rear direction of the vehicle is connected to the rear-seat foot outlet 14, so that a rear-seat foot provided at the rear of the vehicle compartment is provided. It communicates with an outlet (not shown). The opening and closing of these air passages 9 to 11
Switching is performed by the blowout switching doors 12 and 13. The blow-out switching doors 12, 13 are rotated by servo motors 12a, 13a as driving means (see FIG. 2). Further, a predetermined blowing mode described later is switched by the blowing switching doors 12 and 13.

In the present embodiment, as shown in the figure, one end of the air conditioner unit 2 communicates with the downstream side of the heater core 4 and the air upstream side of the hot air passage 7.
The other end communicates with the rear seat foot outlet 14 downstream of the foot air passage 11 and downstream of the front seat foot outlet 13 to bypass the warm air passage 7 and the foot air passage 11. Is formed with a bypass passage 15.

The bypass passage 15 is formed so as to extend from the front side of the vehicle to the rear side of the vehicle, and is opened and closed by a bypass door 16 disposed just behind the heater core 4 on the vehicle side. Also, this bypass door 1
6 is opened and closed by, for example, a servo motor 16a as a driving means (see FIG. 2). Next, the control device 20 of the vehicle air conditioner 1 shown in FIG. 2 will be briefly described. The control device 20
It has well-known computer means such as a RAM and a ROM, and has a turning position (hereinafter referred to as an opening) of the air mix door 8 and a turning position of the switching doors 12 and 13 and the bypass door 16 according to an air-conditioning environment. (Hereinafter, opening degree) is automatically adjusted and switched.

The input terminals of the control device 20 include a temperature setter 21 for setting a set temperature in the vehicle compartment, an outside air sensor 22 for detecting the outside air temperature, an inside air sensor 23 for detecting the temperature in the vehicle compartment, and a heater core 4. A water temperature sensor 24 for detecting the temperature of the engine cooling water to be activated is connected. Note that input terminals surrounded by a dotted line in FIG. 2 are used in another embodiment described later, and have nothing to do with this embodiment.

On the other hand, the output terminals of the control device 20
The above-described servo motors 8a, 12a, 13a, 16a are connected. The control device 20 controls the opening of the air mixing door 8 based on the information from the input terminal. The opening control of the air mixing door 8 is well known and will be briefly described. I do.

The control device 20 calculates a target outlet temperature, which is a target temperature of the conditioned air blown into the vehicle interior, based on the air conditioning information from the input terminal. Then, it is determined that the lower the target blowout temperature, the greater the cooling load in the vehicle compartment, and the mixture ratio of the cool air and the warm air adjusted by the air mix door 8 is controlled so that the cool air has a larger air flow. On the other hand, the control device 20 determines that the heating load in the vehicle interior increases as the target outlet temperature increases, and controls the mixing ratio of the cold air and the hot air adjusted by the air mixing door 8 so that the hot air becomes larger. .

Further, the control device 20 determines the blowing mode in accordance with the target blowing temperature. This will also be described briefly. As the target blowing temperature increases, a face mode, which will be described later, and a bi-level mode will be described. , The foot mode and the foot differential mode are automatically switched in this order. Hereinafter, the blow-out switching doors 12, 13 and the bypass door 16 in the predetermined blow-out mode will be described.
The operation of the air conditioner and the flow of the conditioned air will be described.

Face Mode In the face mode, the blow-out switching door 12 is set to the rotation position shown in FIG. 1A, the air intake of the defroster air passage 9 is fully closed, and the blow-out switching door 13 is moved to the position shown in FIG. With the rotation position shown, the face air passage 10 is fully opened, and the air intake of the foot air passage 11 is completely closed. In addition, the bypass door 16 is set to a turning position shown by i in the drawing, and is set to a turning position for closing the bypass passage 15.

Thus, the conditioned air whose temperature has been adjusted by the air mix door 8 flows only through the face air passage 10. Bi-level mode In the bi-level mode, the face air passage 1 is used in order to achieve head and foot heat, which is the sensation of the occupant, in the middle period such as spring and autumn.
0 is a blowing mode in which cold air is blown into the foot air passage 11 and warm air is blown into the foot air passage 11.

In the bi-level mode, the air inlets of the air passage 10 for the face and the air passage 11 for the foot are opened with the outlet switching door 13 being at the intermediate rotation position shown by f in FIG. Further, the air outlet switching door 12 is set to the intermediate rotation position in FIG. 1A, and the air inlet of the defroster air passage 9 is fully closed. In addition, the bypass door 16 is set to a turning position shown by i in the drawing and to a turning position for closing the bypass passage 15.

As a result, the conditioned air whose temperature has been adjusted by the air mixing door 8 is supplied to the face air passage 10 by approximately half a figure.
And the air passage 11 for the foot. Foot Mode In the foot mode, the blow-out switching door 13 is turned to the rotation position shown in FIG. 1 to close the air intake of the face air passage 10 and fully open the air intake of the foot air passage 11. Then, the outlet switching door 12 is set to the intermediate rotation position shown by g in FIG. In addition, the bypass door 16 is configured as shown in FIG.
The bypass passage 15 is fully opened as a rotation position indicated by middle k.

As a result, most (about 90%) of the conditioned air whose temperature is controlled by the air mix door 8 is blown to the foot air passage 11 and the remaining conditioned air is blown to the defroster air passage 9. Will be done. More specifically, in the foot mode, the bypass door 16 causes the front end of the bypass door 16 to contact the ventilation surface 4 a on the downstream side of the heater core 4 so that the hot air that has passed through the heater core 4 passes through the bypass passage 15 and the hot air passage. 7 and two.

That is, in the foot mode, the flow of the conditioned air to the front seat foot outlet 13 and the rear seat foot outlet 14 is different from that in the bilevel mode. And
In the foot mode, warm air blown from the ventilation surface 4a located above the heater core 4 flows into the defroster air passage 9 and the foot air passage 11 as shown by arrows A and B in FIG. On the other hand, the warm air blown out from the ventilation surface 4 a located below the heater core 4 flows into the bypass passage 15.

As a result, the rear seat foot outlet 14 has
As in the bilevel mode, the warm air passing through the warm air passage 7 and the cool air flowing through the cool air passage 6 are mixed, and the conditioned air passing through the heater core 4 is passed through the warm air passage 7 and the foot air passage 11. Rather than being blown in a U-turn, the warm air that has passed through the heater core 4 by the bypass passage 14 is blown directly to the rear seat foot outlet 14 as shown by the arrow C in FIG. 1 without mixing with the cool air. You.

The reason for this is that the extension duct is connected to the rear-seat foot outlet 14 as described above, and the temperature of the conditioned air actually blown from the rear seat is:
Due to the heat loss in the extension duct, the temperature becomes lower than the temperature of the conditioned air blown out from the front seat foot blowout portion 13. Further, if the conditioned air is blown to the rear foot foot outlet 14 so as to make a U-turn through the warm air passage 7 and the foot air passage 11 without providing the bypass passage 15, the rear seat foot is increased due to an increase in ventilation resistance. The amount of air blown to the foot outlet 14 decreases, and the warm air passage 7 and the foot air passage 1
The temperature of the conditioned air blown to the rear-seat foot outlet 14 is reduced due to the heat loss of the air-conditioner 1.

Therefore, in the present embodiment, the hot air that has passed through the heater core 4 is blown directly to the rear foot foot outlet 13 through the bypass passage 15 so as to bypass the hot air passage 7 and the foot air passage 11. As a result, the air volume from the rear seat foot outlet 13 can be increased, and heat loss in the warm air passage 7 and the foot air passage 11 can be eliminated. Thereby, the temperature of the conditioned air blown out from the rear seat foot blowing section 13 can be increased.

As a result, the feeling of heating for the front seat occupant and the feeling of heating for the rear seat occupant can be approximated. Foot differential mode In the foot differential mode, the blow-out switching door 13 is turned to the rotation position shown in FIG. 1 to close the air intake of the face air passage 10, and the blow-out switching door 12 is moved to the intermediate rotation position shown in e in FIG. As the moving position, the air intakes of the foot air passage 11 and the defroster air passage 9 are opened. In addition, the bypass door 16 is set to a pivot position indicated by k in the drawing similarly to the foot mode, and the bypass passage 15 is fully opened.

Thus, the conditioned air whose temperature is controlled by the air mix door 8 is sent to both the defroster air passage 9 and the foot air passage 11. In this foot differential mode, about half of the conditioned air that has been temperature-controlled by the air mix door 8 is used for the foot air passage 1.
1 and the other half to the defroster air passage 9.

In the foot differential mode, since the bypass passage 15 is open, the feeling of heating for the front seat occupant and the feeling of heating for the rear seat occupant can be approximated as in the case of the foot mode. In the present embodiment, the bypass passage 15 is fully opened in the foot mode and the foot differential mode. However, this may be automatically performed by the control device 20. Specifically, since the blowing mode is determined based on the air conditioning information from the input terminal, when the controller 20 generates a signal indicating that the blowing mode is the foot mode or the foot differential mode, A signal to fully open the bypass passage 15 at the bypass door 16 is transmitted to the servo motor 16a.
Output it to

Defroster Mode In the defroster mode, the air switching inlet 12 of the face air passage 10 and the foot air passage 11 is closed by setting the blowout switching door 12 to the rotation position shown in FIG. Also, the bypass door 15 is closed by setting the bypass door 16 to the pivot position shown by i in FIG.

Thus, the conditioned air whose temperature has been adjusted by the air mix door 8 flows only through the defroster air passage 9. The defroster mode is not switched unless a defroster switch (not shown) provided in the vehicle compartment is not turned on. By the way, in the present embodiment, the opening position of one end side (air intake) of the bypass passage 15 with respect to the heater core 4 is characterized in order to further bring the heating feeling of the front seat occupant and the heating feeling of the rear seat occupant closer.

That is, the structure of the heater core 4 will be briefly described. The heater core 4 is formed of a metal such as aluminum. The heater core 4 is provided on one end side of the heat exchange section 4b, in which hot water flows therein and exchanges heat between the hot water and the air passing through the evaporator 3, and a heat exchange section 4b. It has an inlet tank 4c serving as an inlet for hot water, and an outlet tank 4d provided at the other end of the heat exchange unit 4b and serving as an outlet for hot water of the heat exchange cormorant 4b.

The heat exchanging section 4b is configured such that flat tubes (not shown) in which flow paths are formed linearly are stacked in the front and back directions in FIG. Corrugated fins (not shown) for improving the exchange efficiency are provided. In the present embodiment, the inlet tank 4c and the outlet tank 4d are arranged such that the inlet tank 4c is located above the outlet tank 4d as shown in FIG. And the heat exchange part 4b
The above-mentioned flat tube is moved from the inlet tank 4c to the outlet tank 4c.
It is configured to flow linearly toward d.

Therefore, the temperature of the hot air blown out from the ventilation surface 4a of the heat exchange section 4b located on the inlet tank 4c side is reduced by the blower surface 4a located on the outlet tank 4d side. It becomes higher than the temperature of the warm air. Therefore, in the present embodiment, as shown in FIG. 1, by opening one end side (air intake) of the bypass passage 15 to the inlet tank 4 c side, it is possible to blow hot air having a higher temperature to the bypass passage 15. The heating feeling of the front passenger and the heating feeling of the rear passenger can be made closer to each other.

The fact that one end of the bypass passage 15 is opened to the inlet tank 4c side means that the temperature of the hot air blown into the bypass passage 15 through the heater core 4 is
This means that the temperature of the hot air flowing upward through the heater core 4 is higher than that of the hot air. Therefore, the opening position at one end of the bypass passage 15 is not limited to that shown in FIG.
For example, it may be slightly above FIG.

(Second Embodiment) In the first embodiment, in the foot mode or the foot differential mode, the bypass passage 15 is simply fully opened to provide a feeling of heating to the front seat occupant and a feeling to the rear seat occupant. An example in which the control device 20 automatically controls the opening and closing of the bypass passage 15 in accordance with the warmth of the rear occupant will be described with reference to the flowchart of FIG. I do.

In this embodiment, as indicated by a dotted line in FIG. 2, a rear seat occupancy switch for changing the control content of the bypass door 15 as an input terminal of the control device 20 in accordance with the presence or absence of a rear occupant. 25 and a rear seat priority switch 26 for increasing the feeling of heating of the rear seat occupant over the front seat occupant. First, in step S100, it is determined whether the foot mode is the foot mode or the foot differential mode based on the air conditioning information from the input terminal of the control device 20, and if not, step S400 Then, the bypass passage 15 is closed by the bypass door 15.

If it is determined in step S100 that the mode is the foot mode or the foot differential mode, the flow advances to step S100.
At 200, it is determined whether or not the rear seat occupant switch 25 is turned on. And the rear seat occupant presence / absence switch 25
Is not turned on, that is, when there is no rear seat occupant, the process proceeds to step S400. If there is no rear seat occupant even in the foot mode, the bypass passage 15 is opened and blown out from the rear seat foot outlet 14. Since it is not necessary to increase the temperature of the conditioned air or increase the air volume, the bypass door 16 is closed and the bypass passage 15 is closed.

On the other hand, when the rear seat occupant presence / absence switch 25 is turned on and a signal indicating that there is an occupant in the rear seat is generated, the process proceeds to step S300, and whether the rear seat priority switch 26 is further turned on is determined. Is determined. When it is determined that the rear seat priority switch 26 is turned on, the process proceeds to step S500, and the bypass door control 1
And

If it is determined that the rear seat priority switch 26 has not been turned on, the process proceeds to step S600, and the bypass door control 2 is set. Hereinafter, the bypass door control 1 and the bypass door control 2 will be described with reference to FIG. 4. The bypass door 16 in this example controls the bias door 16 according to the opening degree of the air mix door 8.
As shown in FIG. 4, the opening degree of the air mix door 8 is changed from a max school (a state where all the air passing through the MAXCOOL, the evaporator 3 is blown to the heater core 4 and a cooling state) to a maximum hot (the MAXHOT, the state passing the evaporator 3). The bypass passage 15 is rotated in the direction indicated by the arrow E in FIG. 1 as the air passes through the heater core 4 and turns toward the heating state (ie, in the direction indicated by the arrow D in FIG. 1). Thus, control is performed so that the bypass passage 15 can be opened gradually.

Further, in the present embodiment, the opening of the bypass door 16 with respect to the opening of the air mix door 8 is set to be different depending on the state of the rear seat priority switch 26. That is, the bypass door control 1 and the bypass door control 2 are different in the timing at which the bypass passage 15 is opened with respect to the opening degree of the air mix door 8, and the bypass door control 1 is as shown by a dashed line in FIG. The bypass passage 15 is opened earlier than the bypass door control 2 (shown by a two-dot chain line in FIG. 4).

That is, in the bypass door control 1, since the rear seat priority switch 26 is turned on, the feeling of heating from the front seat occupant to the rear seat occupant is emphasized. The bypass passage 15 is slightly opened even in the air mixing area where the cool air and the hot air are mixed as indicated by the middle D. Then, as shown in FIG. 1, the conditioned air in which the cold air and the hot air flowing through the cold air passage 6 and the hot air passage 7 are mixed is sent to the front seat foot outlet 13, but the rear seats are blown. In addition to the conditioned air in which the cool air and the hot air are mixed, the warm air that has passed through the heater core 4 from the bypass passage 15 is directly blown to the use foot outlet 14.

As a result, compared to when the bypass passage 15 is closed, high-temperature conditioned air is blown to the rear-seat foot outlet 14, regardless of the degree of opening of the air mix door 8. Therefore, the rear passengers can be given a feeling of heating with priority. Also, at this time, as the heating load in the vehicle compartment increases, the rear seat occupant is more likely to feel a lack of heating feeling, so the heating load is large, that is, as the air mix door 8 rotates to the max hot side, the bypass door 16 The opening is set to be large.

Also, in the bypass control 1, the rear passenger occupant does not give priority to the heating sensation of the front occupant, and the air mix door 8 is not operated in the foot mode or the foot differential mode.
Irrespective of the opening degree, the heating sensation of the front occupant and the rear occupant are adjusted to be substantially the same. The embodiments of the present invention have been described above, but the present invention can be applied to the following modifications.

In the above-described embodiment, the present invention is applied to an apparatus for automatically switching the blowing mode. However, the present invention is applied to a manual type air conditioner for a vehicle in which the blowing mode is switched by an occupant's operating force using an outlet switching lever or the like. Is also good.
In this case, for example, the outlet passage switching lever and the bypass door 16 are linked so that the bypass passage 15 is fully opened when the operation position of the outlet switching lever is in the foot mode or the foot differential mode. Good.

Further, one end (air intake) of the bypass passage 15 may be opened to the inlet tank 4 d side of the heater core 4. Further, the present invention does not limit the arrangement structure of the evaporator 3 and the heater core 4, and can be applied to any arrangement structure. In the first embodiment, as the opening of the air mix 8 is shifted from the max school side to the max hot side in the foot mode, the bypass door 16
Of course, 5 may be opened gradually.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a control device of a vehicle air conditioner in the above embodiment, and a configuration diagram of a control device of a vehicle air conditioner in another embodiment of the present invention.

FIG. 3 is a flowchart showing an operation of a bypass door 16 according to another embodiment of the present invention.

FIG. 4 shows a bypass door 16 according to the above embodiment.
FIG. 6 is a diagram showing a correlation between the opening degree of the air mixing door 8 and the opening degree of the air mixing door 8.

FIG. 5 is an overall configuration diagram of a conventional vehicle air conditioner.

[Explanation of symbols]

3 evaporator, 4 heater core, 7 hot air passage, 1
1 ... air passage for foot, 13 ... foot outlet for front seat, 1
4 ... rear seat foot outlet, 15 ... bypass passage, 16 ...
Bypass door

Claims (5)

[Claims] 1. A cooling air exchanger (3) that mixes cold air cooled by a cooling heat exchanger (3) and hot air that has been heated by passing through a heating heat exchanger (4) in a mixing area to produce air-conditioned air. The temperature is adjusted, and the warm air that has passed through the heating heat exchanger (4) downstream of the heating heat exchanger (4) passes through the mixing area and blows the conditioned air to the feet of the front seat occupant. A turn channel (7, 11) for leading a front seat foot outlet for blowing air is provided, and further, conditioned air is blown to the feet of a rear passenger on the downstream side of the turn channel (7, 11). One end side is downstream of the heating heat exchanger (4) and the upstream side of the turn flow path (7, 11). The other end is downstream of the front seat foot outlet (13) and communicates with the rear seat foot outlet (14). Serial turn flow path (7,
11) a bypass passage (15) formed to bypass the 11); and a bypass opening / closing means (16) for opening and closing the bypass passage (15). In the case of heating in which warm air is blown from the foot foot outlet (14), the bypass passage (15) is provided by the bypass opening / closing means (16).
And a portion of the warm air that has passed through the heating heat exchanger (4) through the bypass passage (15) is blown to the rear seat foot outlet (14). apparatus. 2. A cooling heat exchanger (3) for cooling the passing air, and a heating heat exchanger (4) for heating the air passing through the cooling heat exchanger (3). And the hot air passing through the heating heat exchanger (4) is mixed with the cold air passing through the cooling heat exchanger (3) and bypassing the heating heat exchanger (4). It is configured to adjust the temperature of the conditioned air. On the downstream side of the heating heat exchanger (4), the air-conditioning air is blown toward the feet of the front seat occupant while extending upward and then downward. A U-turn-shaped turn flow path (7, 11) provided with a front-seat foot outlet (14) is formed, and air conditioning air is blown to the feet of a rear-seat occupant downstream of the turn flow path. In a vehicle air conditioner in which a rear seat foot outlet (14) for blowing air is formed, The downstream side of the heating heat exchanger (4) and the upstream side of the turn flow path (7, 11) communicate with the other end downstream of the front seat foot outlet (13). To the turn flow path (7,
11) a bypass passage (15) formed to bypass the 11); and a bypass opening / closing means (16) for opening and closing the bypass passage (15). In the case of heating in which warm air is blown from the foot foot outlet (14), the bypass passage (15) is provided by the bypass opening / closing means (16).
And a portion of the warm air that has passed through the heating heat exchanger (4) through the bypass passage (15) is blown to the rear seat foot outlet (14). apparatus. 3. The heating heat exchanger (4) has hot water as a heat source flowing therein, and the heating heat exchanger (4) has a heat exchanger (4b) for exchanging heat between the hot water and air. ), And an inlet tank (4) provided at one end of the heat exchange unit (4b) and serving as an inlet of the hot water of the heat exchange unit (4b).
c) an outlet tank (4d) provided on the other end side of the heat exchange section (4b), exchanges heat with air in the heat exchange section (4b), and forms an outlet section of hot water of the heat exchanger. The heat exchange section (4b) is configured to supply hot water to the inlet tank (4b).
c) so as to linearly flow from the outlet tank (4d) to the outlet tank (4d). One end of the bypass passage (15) is closer to the inlet tank (4c) in the heat exchange section (4b). The vehicle air conditioner according to claim 1 or 2, wherein the vehicle air conditioner is opened. 4. A mixing ratio adjusting door (8) for adjusting a temperature of the conditioned air by adjusting a mixing ratio of the cold air and the warm air, wherein a mixing ratio by the mixing ratio adjusting door (8) is: 4. The device according to claim 1, wherein the bypass opening / closing means (16) opens the bypass passage (15) as the hot air becomes larger. 5. Vehicle air conditioners. 5. A rear seat occupant signal generating means (25) for generating a signal indicating that an occupant is present in the rear seat of the vehicle, and the rear occupant signal generating means (25) allows the occupant to be in the rear seat of the vehicle. When a signal indicating that the bypass passage (1) is generated, the bypass passage (1) is
5. The vehicle air conditioner according to claim 1, wherein the air conditioner is configured to open. 5.