JPH10193949A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress fluctuation of temperature difference between foot part blowoff air and face part blowoff air caused by fluctuation of inside and outside air temperature. SOLUTION: Only in case of an outside air mode and maximum hot mode and also a foot mode and a foot differential mode being set, a control amplifier 44 opens an internal air damper 38. Accordingly, unless maximum hot is set even if the outside air mode and also the foot mode and foot differential mode are set, the internal air damper is always in a closed state, and outside air is taken into an internal air passage 22 and an outside air passage 20 from an outside air suction port 30 and blown out of a defroster blowoff port and a foot blowoff port after passing an evaporator and a heater core to become specified temperature. Comfortable temperature difference can therefore be maintained for cold head and warm foot without being influenced by temperature fluctuation of internal air and outside air.

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, and more particularly, to an air conditioner for a two-layer inside / outside air unit mounted on a vehicle such as an automobile.

[0002]

2. Description of the Related Art Conventionally, as an air conditioner for a vehicle such as an automobile, an air conditioner for a vehicle having a two-layer inner / outer air unit in which upper and lower layers are divided by a partition wall has already been proposed.
A structure disclosed in Japanese Utility Model Laid-Open No. 60-8105, which discloses this type of vehicle air conditioner, will be described below.

As shown in FIG. 16, in this air conditioner 200 for a vehicle, an outside air inlet 202 and a vehicle interior air (inside air) inlet 204 are provided on the windward side, and a defroster outlet 206 and ventilation are provided on the windward side. Outlet 20
8, other air outlets such as a foot air outlet 210 are provided, and an inside air passage 212 from the outside air intake 202 to the defroster outlet 206 and an inside air passage 214 from the inside air intake 204 to another air outlet are provided therein. And a duct 220 having a connection passage 218 connecting the outside air passage 212 and the inside air passage 214 at the leeward side, and an outside air suction port 202 and a inside air suction port 204 of the duct 220. The attached blower fans 222 and 224 and the duct 220
A heat exchanger 226 for heating arranged and partitioned into an outside air passage 212 and an inside air passage 214, and a damper 228 for opening and closing at least a connection passage 218 between the outside air passage 212 and the inside air passage 214. It is provided with a configuration.

In such a vehicle air conditioner having a two-layer unit of inside and outside air, the air conditioner is usually in a foot mode and a foot differential mode, and when the outside air is introduced, the air is sucked from the outside air suction port 202. After adjusting the relatively low temperature air to a predetermined temperature, the air is blown out to the defroster outlet 206, and the relatively high temperature air sucked from the inside air suction port 204 is adjusted to a predetermined temperature, and then the foot outlet By blowing out to 210, a comfortable temperature difference is realized due to head and foot heat.

[0005]

However, in such an air conditioner for a vehicle, when the outside air temperature or the inside air temperature fluctuates, the air temperature sucked from the outside air suction port 202 and the air sucked from the inside air suction port 204 are changed. The temperature difference from the temperature changes, and the temperature difference between the air blown out from the face from the defroster outlet 206 and the foot blown out from the foot outlet 210 fluctuates. As a result, a comfortable temperature difference due to head and foot heat cannot be realized.

The present invention has been made in view of the above-described circumstances, and has as its object to provide an air conditioner for a vehicle which can suppress a change in a temperature difference between a foot-portion airflow and a face-portion airflow due to a change in inside / outside air temperature. .

[0007]

According to a first aspect of the present invention, there is provided an inside / outside air switching means for switching the introduction of air to be introduced into a duct and a partition wall for dividing the inside of a duct into a first passage and a second passage. And a vehicle air conditioner having inside air introduction means for selectively introducing inside air to the first passage, in the foot mode and the foot differential mode, and when the inside / outside air switching means is outside air introduction. The apparatus is characterized in that control means is provided for opening the inside air introduction means and introducing the inside air only at the time of maximum heating, and for blowing out the introduced inside air to the foot portion.

Therefore, only in the foot mode and the foot differential mode, the inside / outside air switching means is at the time of outside air introduction and only at the time of maximum heating, the inside air introduction means is opened by the control means, and the inside air is introduced into the first passage. It is introduced and the introduced indoor air is blown out to the foot. That is, except during the maximum heating, the operation is in the foot mode and the foot differential mode, and the inside air introduction unit is always closed even when the inside / outside air switching unit is introducing outside air. For this reason, the air sucked in from the outside air inlet is adjusted to a predetermined temperature, respectively, and is made into a foot part blowout wind and a face part blowout wind. Variations in the difference can be suppressed, and a comfortable temperature difference can be maintained due to head and foot heat.

On the other hand, at the time of the maximum heating (max hot), the inside air introduction means is opened to introduce the inside air, and the introduced vehicle interior air is blown out to the foot portion, so that the vehicle interior can be efficiently heated quickly. That is, the maximum heating capacity of the air conditioner can be ensured.

According to a second aspect of the present invention, in the air conditioner for a vehicle according to the first aspect, the control means opens the inside air introduction means under a condition in which backflow of outside air does not occur in the vehicle cabin. Is introduced, and the introduced inside air is blown out to the foot portion.

Therefore, it is possible to prevent the backflow of the outside air into the vehicle interior.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] A first embodiment of a vehicle air conditioner according to the present invention will be described below with reference to FIGS.

As shown in FIG. 3, the air conditioner 10 for a vehicle according to the present embodiment is composed of three elements, a blower unit 12, a cooler unit 14, and a heater unit 16. They are integrated by being mutually connected via an air seal material not shown. Further, in the vehicle air conditioner 10, the inside of the duct is partitioned by a partition guide 18 into an outside air passage 20 that can communicate with the outside air and an inside air passage 22 that can communicate with the inside air. It is a unit air conditioner for vehicles.

An evaporator 14A is provided in the cooler unit 14. Also, the heater unit 1
6, a heater core 16A is provided, and a main air mix damper 16 is provided upstream of the heater core 16A.
B, cold air bypass dampers 16C and 16D are provided. A sub air mix damper 16E, an upper and lower bypass damper 16F for connecting the upper and lower passages, a differential damper 16G, and a foot damper 16H are disposed downstream of the heater core 16A. Further, a downstream side of the heater unit 16 is connected to a three-way branch box 23, and the three-way branch box 23 is formed with a center face damper 23A.

As shown in FIG. 1, the blower unit 12
A first blower fan 24 and a second blower fan 2 driven by a single motor 25 are provided in the outside air passage 20 and the inside air passage 22.
6 are provided respectively. In the outside air passage 20, an inside / outside air switching damper 32 as inside / outside air switching means for selectively opening and closing the inside air suction port 28 and the outside air suction port 30 is provided.
Are arranged. The inside / outside air switching damper 32 is opened and closed by driving means such as a cable and a servo motor (not shown).

The inside air passage 22 is provided with a bypass duct 34 for guiding outside air from the outside air suction port 30. Also,
The inside air suction port 36 of the inside air passage 22 is provided with an inside air damper 38 serving as inside air introduction means. The inside air damper 38 opens and closes the inside air suction port 36 and opens the inside air duct side opening 34A of the bypass duct 34. It opens and closes.

The inside air damper 38 is connected to a servomotor 42 by a link 40, and is driven by the servomotor 42 to close the inside air duct side opening 34A of the bypass duct 34 (the position indicated by the solid line in FIG. 1; (Position) and an outside air position (a position indicated by a two-dot chain line in FIG. 1, a closed position) for closing the inside air suction port 36. A control amplifier 44 as control means is connected to the servomotor 42. The control amplifier 44 includes an inside / outside air mode switch 46, an air outlet mode switch 48, a vehicle speed sensor 50, a blower voltage detection circuit 52, A max hot switch 53 is connected.

The inside / outside air mode switch 46 and the air outlet mode switch 48 are turned on / off in accordance with the operation of the inside / outside air lever and the air outlet mode lever provided on the heater control of the instrument panel, respectively. ing. Max hot switch 53
Is turned on and off in response to operation of a temperature control (temperature control) lever provided in a heater control of an instrument panel.

Next, the operation of the present embodiment will be described. FIG.
As shown in FIG. 2, in the vehicle air conditioner of this embodiment, when the inside / outside air mode switch 46 is set to the inside air mode by operating the inside / outside air lever provided on the heater control of the instrument panel, the inside / outside air switching damper 32 is provided. Is closed (at the position indicated by the two-dot chain line in FIG. 1), and the servo motor 42 is rotated by a predetermined angle to open the inside air damper 38.

When the inside / outside air lever is operated to set the inside / outside air mode switch 46 to the outside air mode, and the temperature control lever is operated to set the mode other than the maximum hot mode (at the time of temperature control), the inside / outside air switching damper 32 is activated. When the servo motor 42 is opened (the position indicated by the solid line in FIG. 1),
Is rotated by a predetermined angle to the outside air position. Accordingly, the inside air damper 38 is closed, and the outside air position (the position indicated by the two-dot chain line in FIG. 1) where the outside air guided from the bypass duct 34 is introduced into the inside air passage 22 is set.

Further, the inside / outside air mode switch 46 is set to the outside air mode, and the maximum temperature (maximum heating) is set by operating the temperature control lever (the maximum hot switch 53 is turned on).
Also in cases other than the foot mode and the foot differential mode, the servo motor 42 rotates by a predetermined angle to be in the outside air position. Accordingly, the inside air damper 38 is closed, and the outside air position (the position indicated by the two-dot chain line in FIG. 1) where the outside air guided from the bypass duct 34 is introduced into the inside air passage 22 is set.

When the mode is set to the outside air mode, the mode is set to the maximum hot mode, and the mode is set to the foot mode and the foot differential mode, the control amplifier 44 calculates the ram pressure from the vehicle speed data from the vehicle speed sensor 50, and The blower discharge pressure calculated from the blower voltage value of the blower voltage detection circuit 52 is compared with the blower discharge pressure. When the ram pressure is higher than the blower discharge pressure, the inside air damper 38 is closed (the position indicated by the two-dot chain line in FIG. 1). . That is, under the condition where the ram pressure becomes larger than the blower discharge pressure and the backflow of the outside air into the passenger compartment occurs, the inside air damper 38 is closed, so that the outside air flows into the inside air passage 22.
Backflow from the inside air suction port 36 into the vehicle interior. Therefore, outside air is taken into the inside air passage 22 from the outside air suction port 30 through the bypass duct 34, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and is blown out from the foot outlet. Further, outside air is taken into the outside air passage 20 from the outside air suction port 30, passes through the evaporator and the heater core, reaches a predetermined temperature T2 (T2 <T1), and is blown out from the defroster outlet. Therefore, it is possible to maintain a comfortable temperature difference due to head and foot heat without being affected by temperature fluctuations of the inside and outside air. . Further, since the outside air can be introduced into the inside air passage 22 to secure the air volume, the heating performance does not decrease.

On the other hand, in the case of the outside air mode, the maximum hot mode and the foot mode and the foot differential mode, when the ram pressure is not larger than the blower discharge pressure, that is, when the backflow of the outside air does not occur in the vehicle interior. Then, the servo motor 42 is rotated by a predetermined angle to open the inside air damper 38 (the position indicated by the solid line in FIG. 1). For this reason, the inside air is taken into the inside air passage 22 from the room through the inside air suction port 36, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and is blown out to the foot outlet, so that the blown air blown to the feet of the occupant is efficiently discharged. It can be heated well, and the maximum heating capacity can be secured. Second Embodiment A second embodiment of the vehicle air conditioner of the present invention will be described below with reference to FIGS.

Note that the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 4, in this embodiment, the opening and closing of the inside / outside air switching damper 32 and the opening and closing of the inside air damper 38 are performed by one.
The configuration is performed by two servo motors 60.
The servo motor 60 is connected to the inside / outside air switching damper 32 by a link 6.
2 and is connected to the inside air damper 38 by a link 64. In addition, the servomotor 60 has an outside air mode position 60A, a two-layer mode position 60B, and an inside air mode position 60B.
It has three positions of C and the outside air mode position 60A
, The inside / outside air switching damper 32 is opened via the link 62 and the link 64, and the inside air damper 38 is closed. When the servomotor 60 is in the two-layer mode position 60B, the inside / outside air switching damper 32 is opened via the link 62 and the link 64, and the inside air damper 38 is also opened. Further, when the servo motor 60 is at the inside air mode position 60C, the inside / outside air switching damper 32 is closed and the inside air damper 38 is opened via the link 62 and the link 64.

Next, the operation of the present embodiment will be described. FIG.
As shown in FIG. 2, in the vehicle air conditioner of this embodiment, when the inside / outside air mode switch 46 is set to the inside air mode by operating the inside / outside air lever provided in the heater control of the instrument panel, the servo motor 60 It rotates by an angle and moves to the inside air mode position 60C. Therefore, the inside / outside air switching damper 32 is closed (the position indicated by the two-dot chain line in FIG. 4). The inside air damper 38 is opened (the position indicated by the solid line in FIG. 4) or closed (position indicated by the two-dot chain line in FIG. 4).

If the inside / outside air lever is operated to set the inside / outside air mode switch 46 to the outside air mode, and the temperature control lever is operated to set the time other than the maximum heating time, the servo motor 60 is rotated by a predetermined angle. Then, it becomes the outside air mode position 60A. Therefore, the inside / outside air switching damper 32 is opened (the position indicated by the solid line in FIG. 4), the inside air damper 38 is closed, and outside air guided from the bypass duct 34 is introduced into the inside air passage 22.

When the outside air mode is set and the maximum heating time is set, when the outlet mode switch 48 is set to a mode other than the foot mode and the foot differential mode by operating the outlet mode lever, the servo motor 60 rotates by a predetermined angle. , Move to the outside air mode position. Therefore, the inside / outside air switching damper 32 is opened, and the inside air damper 38 is closed,
The outside air guided from the bypass duct 34 is introduced into the inside air passage 22.

In the case of the outside air mode and the maximum heating, when the foot mode and the foot differential mode are set,
The control amplifier 44 calculates the ram pressure from the vehicle speed data from the vehicle speed sensor 50, compares the ram pressure with the blower discharge pressure calculated from the blower voltage value of the blower voltage detection circuit 52, and determines that the ram pressure is If the pressure is higher than the pressure, that is, if the ram pressure is higher than the blower discharge pressure and the backflow of the outside air into the vehicle cabin occurs, the servomotor 60 rotates a predetermined angle and the outside air mode position 60
Move to A. Therefore, the inside / outside air switching damper 32 is opened and the inside air damper 38 is closed. For this reason,
The outside air does not flow backward from the inside air suction port 36 of the inside air passage 22 into the vehicle interior.

Outside air is taken into the inside air passage 22 from the outside air suction port 30 via the bypass duct 34, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and is blown out to the foot outlet. In addition, outside air suction port 3
Outside air is taken into the outside air passage 20 from 0, passes through the evaporator and the heater core, and reaches a predetermined temperature T2 (T2 <T1).
After that, it is blown out to the defroster outlet. For this reason, it is possible to maintain a comfortable temperature difference due to head and foot heat without being affected by the temperature of the inside and outside air. Further, since the outside air can be introduced into the inside air passage 22 to secure the air volume, the heating performance does not decrease.

On the other hand, in the case of the outside air mode and the maximum heating, when the foot mode and the foot differential mode are set,
If the ram pressure is not greater than the blower discharge pressure,
Under the condition that the backflow of the outside air does not occur in the vehicle interior, the servo motor 60 rotates by a predetermined angle and the two-layer mode position 60B
Go to Therefore, the inside / outside air switching damper 32 is opened, and the inside air damper 38 is also opened. As a result, the inside air is taken into the inside air passage 22 from the inside of the room through the inside air suction port 36, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and blows out to the foot outlet. Can be warmed well,
Maximum heating capacity can be secured.

Further, since the opening / closing of the inside / outside air switching damper 32 and the opening / closing of the inside air damper 38 are performed by one servomotor 60, the cost can be reduced. Third Embodiment A third embodiment of the vehicle air conditioner according to the present invention will be described below with reference to FIGS.

The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 6, in the present embodiment, when the blower motor 25 is operated, the vehicle does not generate backflow of outside air into the vehicle interior. (See FIG. 1) blower voltage detection circuit 52
, A blower switch 66 is connected.

Next, the operation of the present embodiment will be described. The description of the same operation as that of the first embodiment is omitted.

In this embodiment, the inside / outside air mode switch 4
In the case where 6 is set to the outside air mode and the maximum heating is performed, the control amplifier 4 is set to the foot mode and the foot differential mode.
In 4, the inside air damper 38 is closed by the servomotor 42 under the condition that the blower switch 66 is off, that is, the blower motor 25 is stopped and the backflow of the outside air to the vehicle compartment occurs. Therefore, the outside air does not flow backward from the inside air suction port 36 of the inside air passage 22 into the vehicle interior. Therefore, outside air is taken into the inside air passage 22 from the outside air suction port 30 via the bypass duct 34, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and is blown out to the foot outlet. Further, outside air is taken into the outside air passage 20 from the outside air suction port 30, passes through an evaporator and a heater core, reaches a predetermined temperature T2 (T2 <T1), and is blown out to a defroster outlet. And can maintain a comfortable temperature difference due to head and foot heat. Furthermore, inside air passage 2
Since the outside air can be introduced into 2 and the air volume can be secured,
There is no decrease in heating performance.

On the other hand, in the case of the outside air mode and the maximum heating, when the foot mode and the foot differential mode are set,
Under the condition that the blower switch 66 is ON, that is, the blower motor 25 is rotating and the backflow of the outside air does not occur in the vehicle interior, the servo motor 42 is rotated by a predetermined angle to open the inside air damper 38 (solid line in FIG. 6). Position). For this reason,
Inside air is taken into the inside air passage 22 from the inside of the room through the inside air suction port 36, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and is blown out to the foot outlet, so that the blown air blown out to the feet of the occupant is efficiently warmed. To ensure maximum heating capacity. Further, the configuration is simpler than that of the first embodiment, the productivity of the apparatus is improved, and the cost can be reduced. [Fourth Embodiment] Hereinafter, a fourth embodiment of the vehicle air conditioner of the present invention will be described with reference to FIGS.

The same members as those of the second or third embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 8, in this embodiment, when the blower motor 25 is operated, the vehicle does not generate backflow of outside air into the vehicle interior. (See FIG. 4) Blower voltage detection circuit 52
, A blower switch 66 is connected.

Next, the operation of the present embodiment will be described. The description of the same operation as that of the third embodiment is omitted.

As shown in FIG. 9, in the air conditioner for a vehicle according to the present embodiment, when the inside / outside air mode switch 46 is set to the outside air mode and the maximum heating is performed, the control is performed in the foot mode and the foot differential mode. The amplifier 44 for the air conditioner operates under the condition that the blower switch 66 is off, that is, the blower motor 25 is stopped and the backflow of the outside air to the passenger compartment occurs.
The servo motor 60 rotates by a predetermined angle and moves to the outside air mode position 60A. Thereby, the inside / outside air switching damper 32
Is opened and the inside air damper 38 is closed.
The outside air does not flow backward from the inside air suction port 36 of the inside air passage 22 into the vehicle interior.

Outside air is taken into the inside air passage 22 from the outside air suction port 30 via the bypass duct 34, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and is blown out to the foot outlet. In addition, outside air suction port 3
Outside air is taken into the outside air passage 20 from 0, passes through the evaporator and the heater core, and reaches a predetermined temperature T2 (T2 <T1).
After that, it is blown out to the defroster outlet. For this reason, it is possible to maintain a comfortable temperature difference due to head and foot heat without being affected by the temperature of the inside and outside air. Further, since the outside air can be introduced into the inside air passage 22 to secure the air volume, the heating performance does not decrease.

On the other hand, in the case of the outside air mode and the maximum heating, when the foot mode and the foot differential mode are set,
Under the condition that the blower switch 66 is turned on, that is, the blower motor 25 is rotating and the backflow of the outside air into the vehicle compartment does not occur, the servo motor 60 rotates by a predetermined angle and moves to the two-layer mode position 60B. Therefore, the inside / outside air switching damper 32 is opened, and the inside air damper 38 is also opened. As a result, the inside air is taken into the inside air passage 22 from the inside of the room through the inside air suction port 36, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and blows out to the foot outlet. It can be heated well, and the maximum heating capacity can be secured.

Further, since the opening / closing of the inside / outside air switching damper 32 and the opening / closing of the inside air damper 38 are performed by one servomotor 60, the cost can be reduced. [Fifth Embodiment] Hereinafter, a fifth embodiment of the vehicle air conditioner of the present invention will be described with reference to FIGS.

The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 10, in this embodiment,
Instead of the control amplifier 44 (see FIG. 1) of the first embodiment, the servomotor 42 is controlled by a relay circuit 54 as control means.

As shown in FIG. 11, the relay coil 54A of the relay circuit 54 is connected to a power supply 56 and a blower position detecting switch 58 provided for a heater control of the instrument panel. In this case, the blower position detection switch 58 is turned on and the relay coil 54A is energized.

Next, the operation of the present embodiment will be described. The inside / outside air mode switch 46 is connected to a power supply 56. When the inside / outside air mode switch 46 is connected to a contact 46A on the inside air mode side, the servomotor 42 is driven to open the inside air damper 38 (FIG. 10). (Solid line position, shy position).

A max hot switch 47 is connected to a contact 46B on the outside air mode of the inside / outside air mode switch 46. The inside / outside air mode switch 46 is connected to a contact 46B on the outside air mode, and the max hot switch 47 is turned off. , The servomotor 42 is driven to close the inside air damper 38 (the position indicated by the solid line in FIG. 10 and the outside air position).

An on-side contact 47B of the max hot switch 47 is connected to an outlet mode switch 48, an inside / outside air mode switch 46 is connected to a contact 46B on the outside air mode, and the max hot switch 47 is turned on. And the outlet mode switch 48 is connected to the contact 4 on the side other than the foot mode and the foot differential mode.
8A, the servomotor 42 is driven to close the inside air damper 38 (the position indicated by the two-dot chain line in FIG. 10, the outside air position).

A relay switch 54B is connected to the contact 48B on the foot mode side of the outlet mode switch 48, and the inside / outside air mode switch 46 is connected to the contact 46B on the outside air mode.
7 is connected to the on-side contact 47B, and the outlet mode switch 48 is connected to the foot mode and foot differential mode side contact 48B, the relay switch 54B
Is supplied with a power supply voltage. This relay switch 54B
Is connected to the low air flow or off-time side contact 54C in a state where the relay coil 54A is not energized (the heater control is set to low air flow or off and the blower position detection switch 58 is off). In this state, the servo motor 42 is driven to close the inside air damper 38 (the position indicated by the two-dot chain line in FIG. 10, the outside air position).

When the relay coil 54A is energized (the heater control is set to a high air flow and the blower position detection switch 58 is turned on), the relay switch 54B is turned on from the low air flow or off contact 54C. The contact is switched to the high air flow side contact 54D, the servomotor 42 is driven, and the inside air damper 38 is opened (the position indicated by the solid line in FIG. 10, the inside air position).

For this reason, in the present embodiment, when the mode is set to the outside air mode, the mode is set to the maximum hot, and the mode is set to the foot mode and the foot differential mode, the heater control is set to a low air volume or off, and the blower position detecting switch 58 is turned off. In this case, the servo motor 42 is rotated by a predetermined angle to close the inside air damper 38 (to the position indicated by the two-dot chain line in FIG. 10). That is, under the condition in which the backflow of the outside air into the vehicle compartment occurs, the inside air damper 38 is closed, so that the outside air does not flow back into the vehicle compartment from the inside air suction port 36 of the inside air passage 22. Therefore, outside air is taken into the inside air passage 22 from the outside air suction port 30 through the bypass duct 34, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and is blown out from the foot outlet. Further, outside air is taken into the outside air passage 20 from the outside air suction port 30, passes through the evaporator and the heater core, and passes through a predetermined temperature T2 (T2 <T2).
After 1), it is blown out from the defroster outlet.
Therefore, it is possible to maintain a comfortable temperature difference due to head and foot heat without being affected by temperature fluctuations of the inside and outside air. Furthermore, inside air passage 2
Since the outside air can be introduced into 2 and the air volume can be secured,
There is no decrease in heating performance.

On the other hand, in the case where the outside air mode is set, the maximum hot is set, and the foot mode and the foot differential mode are set, when the heater control is set to a high air volume and the blower position detecting switch 58 is turned on,
By rotating the servo motor 42 by a predetermined angle, the inside air damper 38 is rotated.
Open (the position indicated by the solid line in FIG. 10). For this reason, inside air is taken into the inside air passage 22 from the room through the inside air suction port 36, passes through the evaporator and the heater core, and reaches a predetermined temperature T.
After the air pressure reaches 1, the air blows out to the foot outlet, so that the air blown out to the feet of the occupant can be efficiently warmed, and the maximum heating capacity can be secured.

Further, in the present embodiment, since the relay circuit 54 controls the servomotor 42, the cost can be reduced as compared with the first embodiment.

If the ram pressure can be reduced on the body side or the like, the above-mentioned switching (inside air position) can be performed even when the air volume is low. [Sixth Embodiment] Hereinafter, a sixth embodiment of the vehicle air conditioner of the present invention will be described with reference to FIGS.

The same members as those in the second and fifth embodiments are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 12, in the present embodiment,
The opening / closing of the inside / outside air switching damper 32 and the opening / closing of the inside air damper 38 are performed by one servomotor 60, and the servomotor 60 is controlled by a relay circuit 54.

Next, the operation of the present embodiment will be described. FIG.
As shown in FIG. 3, the inside / outside air mode switch 46 is connected to the power supply 5.
When the inside / outside air mode switch 46 is connected to the inside air mode side contact 46A, the servomotor 60 rotates by a predetermined angle and moves to the inside air mode position 60C. Therefore, the inside / outside air switching damper 32 is closed (FIG. 1).
2 (the position indicated by the two-dot chain line). The inside air damper 38 is opened (the position indicated by the solid line in FIG. 12) or closed (position indicated by the two-dot chain line in FIG. 12).

When the inside / outside air mode switch 46 is connected to the contact 46B on the outside air mode side and the max hot switch 47 is connected to the contact 47A on the off side, the servo motor 60 is rotated by a predetermined angle to allow the outside air mode to rotate. Mode position 6
It becomes 0A. Therefore, the inside / outside air switching damper 32 is opened, and the inside air damper 38 is closed, so that outside air guided from the bypass duct 34 is introduced into the inside air passage 22.

The inside / outside air mode switch 46 is connected to a contact 46B on the outside air mode side, the max hot switch 47 is connected to the contact 47B on the on side, and the outlet mode switch 48 is connected to a side other than the foot mode and the foot differential mode. Is connected to the contact 48A, the servomotor 60 rotates by a predetermined angle and moves to the outside air mode position 60A. Therefore, the inside / outside air switching damper 32 is opened, the inside air damper 38 is closed, and the bypass duct 34 is closed.
Is introduced into the inside air passage 22.

When the relay coil 54A is energized (heater control is set to a high air flow and the blower position detection switch 58 is turned on), the relay switch 54B is turned on by a contact 54C on the low air flow or off side. The contact is switched to the high air flow side contact 54D, the servo motor 42 is driven, and the inside air damper 38 is opened (the position indicated by the solid line in FIG. 12, the inside air position).

For this reason, in the present embodiment, when the mode is set to the outside air mode, the mode is set to the maximum hot mode, and the mode is set to the foot mode and the foot differential mode, the heater control is set to a low air volume or off, and the blower position detecting switch 58 is turned off. , The relay switch 54B
When the relay coil 54A is not energized, the relay coil 54A is connected to the low air flow or off-side contact 54C. In this state, the servomotor 60 rotates a predetermined angle and moves to the outside air mode position 60A. As a result, the inside / outside air switching damper 32 is opened, and the inside air damper 38 is closed. Therefore, the outside air does not flow back into the vehicle interior from the inside air suction port 36 of the inside air passage 22.

The outside air is taken into the inside air passage 22 from the outside air suction port 30 through the bypass duct 34, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and is blown out to the foot outlet. In addition, outside air suction port 3
Outside air is taken into the outside air passage 20 from 0, passes through the evaporator and the heater core, and reaches a predetermined temperature T2 (T2 <T1).
After that, since the air is blown out to the defroster air outlet, the temperature of the inside and outside air does not fluctuate, and a comfortable temperature difference can be maintained due to head and foot heat. Further, since the outside air can be introduced into the inside air passage 22 to secure the air volume, the heating performance does not decrease.

On the other hand, when the outside air mode is set, the maximum hot is set, and the foot mode and the foot differential mode are set, when the heater control is set to a high air volume and the blower position detection switch 58 is turned on,
The servo motor 60 rotates by a predetermined angle, moves to the two-layer mode position 60B, opens the inside / outside air damper 32 (the position indicated by the solid line in FIG. 12), and opens the inside air damper 38 (FIG. 12).
Solid line position). For this reason, the inside air is taken into the inside air passage 22 from the room through the inside air suction port 36, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and is blown out to the foot outlet, so that the blown air blown to the feet of the occupant is efficiently discharged. It can be heated well, and the maximum heating capacity can be secured.

Further, since the opening / closing of the inside / outside air switching damper 32 and the opening / closing of the inside air damper 38 are performed by one servomotor 60 and the servomotor 60 is controlled by the relay circuit 54, the cost can be reduced. Seventh Embodiment A seventh embodiment of the vehicle air conditioner of the present invention will be described below with reference to FIG.

The same members as those in the third and fifth embodiments are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 14, in this embodiment,
Instead of the blower position detection switch 58 of the fifth embodiment (FIG. 11), a blower switch 70 is
4 is connected to the relay coil 54A, and when the blower switch 70 is turned on, the relay coil 54A is energized.

Next, the operation of the present embodiment will be described. The description of the same operation as in the fifth embodiment will be omitted.

The inside / outside air mode switch 46 is connected to the contact 46 B on the outside air mode side,
Is connected to the contact 47B on the ON side and the outlet mode switch 48 is connected to the contact 48B on the foot mode and foot differential mode, the power supply voltage is supplied to the relay switch 54B. This relay switch 54B
When the relay coil 54A is not energized (the blower switch 70 is off), the relay coil 54A is connected to the contact 54C on the blower off side. In this state, the servomotor 42 is driven to close the inside air damper 38 (see FIG. 10). (The position indicated by the two-dot chain line in FIG. 10, the outside air position). Therefore, the outside air does not flow back into the vehicle interior from the inside air suction port 36 of the inside air passage 22. In addition, the bypass duct 34 is connected to the outside air suction port 30.
The outside air is taken into the inside air passage 22 via the evaporator, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and is blown out to the foot outlet. Further, outside air is taken into the outside air passage 20 from the outside air suction port 30, passes through an evaporator and a heater core, reaches a predetermined temperature T2 (T2 <T1), and is blown out to a defroster outlet. And can maintain a comfortable temperature difference due to head and foot heat. Further, since the outside air can be introduced into the inside air passage 22 to secure the air volume, the heating performance does not decrease.

On the other hand, the inside / outside air mode switch 46 is connected to the outside air mode side contact 46B, the max hot switch 47 is connected to the ON side contact 47B, and the outlet mode switch 48 is connected to the foot mode and foot differential mode side. When connected to the contact 48B, the relay coil 54A
Is turned on (the blower switch 70 is turned on), the relay switch 54B is switched from the contact 54C on the blower off side to the contact 54D on the blower on side, and the servo motor 42 is turned on.
To open the inside air damper 38 (see FIG. 10) (see FIG. 10).
(Solid line position, shy position).

For this reason, the inside air is taken into the inside air passage 22 from the room through the inside air suction port 36, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and blows out to the foot outlet, so that the blowout blows out to the feet of the occupant. The wind can be efficiently heated, and the maximum heating capacity can be secured.

Further, in the present embodiment, since the servo circuit 42 is controlled by the relay circuit 54, the cost can be reduced as compared with the first embodiment. [Eighth Embodiment] Hereinafter, a seventh embodiment of the vehicle air conditioner of the present invention will be described with reference to FIG.

The same members as those in the fourth and sixth embodiments are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 15, in this embodiment,
Instead of the blower position detection switch 58 of the sixth embodiment (FIG. 13), a blower switch 70 is
4 is connected to the relay coil 54A, and when the blower switch 70 is turned on, the relay coil 54A is energized.

Next, the operation of the present embodiment will be described. The description of the same operation as in the sixth embodiment will be omitted.

The inside / outside air mode switch 46 is connected to the contact 46 B on the outside air mode side,
Is connected to the contact 47B on the ON side and the outlet mode switch 48 is connected to the contact 48B on the foot mode and foot differential mode, the power supply voltage is supplied to the relay switch 54B. This relay switch 54B
When the relay coil 54A is not energized (the blower switch 70 is off), the relay coil 54A is connected to the contact 54C on the blower-off side. In this state, the servomotor 60 rotates a predetermined angle and moves to the outside air mode position 60A. . Therefore, the inside / outside air switching damper 32 is opened and the inside air damper 38 is closed.

Accordingly, the outside air does not flow backward from the inside air suction port 36 of the inside air passage 22 into the vehicle interior. As a result, the inside air passage 2 is passed through the outside air suction port 30 through the bypass duct 34.
The outside air is taken into 2 and passes through an evaporator and a heater core, reaches a predetermined temperature T1, and is blown out to a foot outlet. Further, outside air is taken into the outside air passage 20 from the outside air suction port 30, passes through an evaporator and a heater core, reaches a predetermined temperature T2 (T2 <T1), and is blown out to a defroster outlet. And can maintain a comfortable temperature difference due to head and foot heat. Further, since the outside air can be introduced into the inside air passage 22 to secure the air volume, the heating performance does not decrease.

On the other hand, the inside / outside air mode switch 46 is connected to the outside air mode side contact 46B, the max hot switch 47 is connected to the ON side contact 47B, and the air outlet mode switch 48 is connected to the foot mode and the foot differential mode side. When connected to the contact 48B, the relay coil 54A
Is turned on (the blower switch 70 is turned on), the relay switch 54B switches from the contact 54C on the blower-off side to the contact 54D on the blower-on side. As a result, the servo motor 60 rotates by a predetermined angle and the two-layer mode position 60B
Go to Therefore, the inside / outside air switching damper 32 is opened, and the inside air damper 38 is also opened. Therefore, the inside air is taken into the inside air passage 22 from the inside of the room through the inside air suction port 36, passes through the evaporator and the heater core, reaches a predetermined temperature T1, and blows out to the foot outlet, so that the blowing wind blown to the feet of the occupant can be efficiently generated. It can be warmed and the maximum heating capacity can be secured.

The opening / closing of the inside / outside air switching damper 32 and the opening / closing of the inside air damper 38 are performed by one servomotor 60, and the servomotor 60 is controlled by the relay circuit 54, so that the cost can be reduced.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to such an embodiment, and various other embodiments are within the scope of the present invention. It is clear to a person skilled in the art that is possible. For example, instead of the servomotors 42 and 60, another motor such as a stepping motor or a moving means such as a solenoid may be used. Further, the inside air introduction unit and the inside / outside air switching unit are not limited to the damper structure as in the embodiment, and the inside air introduction control and the inside / outside air switching control may be performed by, for example, a film damper.

[0082]

According to the first aspect of the present invention, a partition wall for dividing the inside of a duct into a first passage and a second passage, inside / outside air switching means for switching the introduction of air introduced into the duct, A vehicle air conditioner having an inside air introducing means for selectively introducing inside air into the passage of the vehicle, in the foot mode and the foot differential mode, wherein the inside / outside air switching means is at the time of outside air introduction, and Only at the time of heating, since there is provided control means for opening the inside air introduction means to introduce the inside air and blowing out the introduced inside air to the foot portion, the temperature difference between the foot portion blowout wind and the face portion blowout wind due to the fluctuation of the outside air temperature. And an excellent effect that the maximum heating capacity of the air conditioner can be ensured.
According to a second aspect of the present invention, in the air conditioner for a vehicle according to the first aspect, the control means opens the inside air introduction means under a condition that backflow of outside air does not occur in the vehicle interior, and the control means opens the first passage. Since the inside air is introduced and the introduced inside air is blown out to the foot portion, in addition to the effect of the first aspect, there is an excellent effect that the backflow of the outside air into the vehicle compartment can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a part of a vehicle air conditioner according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating control of the vehicle air conditioner according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram illustrating a vehicle air conditioner according to the first embodiment of the present invention.

FIG. 4 is a schematic configuration diagram illustrating a part of a vehicle air conditioner according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram for describing control of a vehicle air conditioner according to a second embodiment of the present invention.

FIG. 6 is a schematic configuration diagram showing a part of a vehicle air conditioner according to a third embodiment of the present invention.

FIG. 7 is an explanatory diagram for explaining control of a vehicle air conditioner according to a third embodiment of the present invention.

FIG. 8 is a schematic configuration diagram showing a part of a vehicle air conditioner according to a fourth embodiment of the present invention.

FIG. 9 is an explanatory diagram for explaining control of a vehicle air conditioner according to a fourth embodiment of the present invention.

FIG. 10 is a schematic configuration diagram showing a part of a vehicle air conditioner according to a fifth embodiment of the present invention.

FIG. 11 is an explanatory diagram illustrating control of a vehicle air conditioner according to a fifth embodiment of the present invention.

FIG. 12 is a schematic configuration diagram showing a part of a vehicle air conditioner according to a sixth embodiment of the present invention.

FIG. 13 is an explanatory diagram for explaining control of a vehicle air conditioner according to a sixth embodiment of the present invention.

FIG. 14 is an explanatory diagram for describing control of a vehicle air conditioner according to a seventh embodiment of the present invention.

FIG. 15 is an explanatory diagram for describing control of a vehicle air conditioner according to an eighth embodiment of the present invention.

FIG. 16 is a schematic configuration diagram showing a vehicle air conditioner according to a conventional embodiment.

[Explanation of symbols]

 Reference Signs List 10 air conditioner for vehicle 12 blower unit 18 partition guide 20 outside air passage 22 inside air passage 24 first blower fan 26 second blower fan 32 inside / outside air switching damper (inside / outside air switching means) 34 bypass duct 36 inside air suction port 38 inside air damper Inside air introduction means) 42 servo motor 44 control amplifier (control means) 46 inside / outside air mode switch 48 air outlet mode switch 50 vehicle speed sensor 52 blower voltage detection circuit 54 relay circuit (control means) 58 blower position detection switch

Claims (2)

[Claims] 1. A partition wall for dividing the inside of a duct into a first passage and a second passage, inside / outside air switching means for switching introduction of air introduced into the duct, and inside air selectively introduced into the first passage. An air conditioner for a vehicle having an inside air introduction unit that enables the inside air introduction unit in a foot mode and a foot differential mode, wherein the inside / outside air switching unit is outside air introduction, and only at the time of maximum heating. An air conditioner for a vehicle, comprising: control means for introducing open inside air and blowing out the introduced inside air to a foot portion. 2. The control means opens the inside air introduction means to introduce the inside air under a condition in which no backflow of outside air into the vehicle interior occurs, and blows out the introduced inside air to a foot portion. Item 2. The vehicle air conditioner according to Item 1.