JP3306451B2 - Vehicle air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a two-layer mode in which inside air is introduced into a first air passage leading to a foot opening and outside air is introduced into a second air passage leading to a defroster opening, as an inside / outside air mode. , A whole outside air mode in which outside air is introduced into the second air passage can be set, and as a blowing mode,
The present invention relates to a vehicle air conditioner capable of setting a foot mode and a foot differential mode.

[0002]

2. Description of the Related Art As a vehicle air conditioner as described above,
There is one disclosed in Japanese Patent Application No. 8-288801 filed earlier by the present applicant. Briefly describing the configuration of this prior application, the air conditioning case of the vehicle air conditioner has an inside air intake port and an outside air intake port formed at one end, and a foot opening communicating with the foot outlet at the other end. A defroster opening communicating with the defroster outlet and a face opening communicating with the face outlet are formed. A partition plate that defines a first air passage extending from the inside air intake port or the outside air intake port to the face opening and the foot opening and a second air passage extending from the outside air intake port to the defroster opening inside the air conditioning case. Is provided.

[0003] The inside / outside air mode includes a whole inside air mode in which inside air is introduced into the first and second air passages, and a first inside air mode.
And an outside air mode in which outside air is introduced into the second air passage;
There is a two-layer mode in which inside air is introduced into the first air passage and outside air is introduced into the second air passage. In addition, the blowing mode includes a foot mode in which a large amount of conditioned air is blown from the foot outlet compared to the defroster outlet, a foot differential mode in which the same conditioned air is blown from the foot outlet and the defroster outlet, and a face outlet. There is a face mode that blows out conditioned air.

When the foot mode or the foot differential mode is selected, the two-layer mode or the outside air mode is set according to the magnitude of the heating capacity with respect to the target temperature. By using the two-layer mode in the foot mode or the foot differential mode, the outside air having a lower humidity than the inside air is blown out to the vehicle windshield to prevent fogging of the vehicle windshield, and the inside air having a higher temperature than the outside air is used for the occupant's feet. To improve heating performance.

[0005]

However, the above-mentioned 2
In the layer mode, the first air passes through a minute gap inevitably formed by providing the partition plate (for example, a gap between a heat exchanger or the like disposed over the partition plate and the partition plate). Since the high humidity inside air introduced into the passage is slightly mixed into the second air passage, the air in the second air passage has a slightly higher humidity than the outside air. That is, the air in the second air passage in the two-layer mode has a slightly higher humidity than the air in the second air passage in the all outside air mode. Therefore, the foot opening and the defroster opening
In the blow mode that blows air from
If specified, slightly humid air may be
Surface, the inside of the vehicle windshield may become cloudy.
There was.

In the foot mode, the ratio of the amount of air blown out from the defroster outlet is smaller than in the foot differential mode, so that the anti-fog effect of the vehicle windshield is small. So
Therefore , particularly when the two-layer mode is set in the foot mode , the anti-fog effect of the vehicle windshield is small, and a slightly high humidity air is blown out to the inner surface of the vehicle windshield. There was fear.

[0007] The present invention has been made in view of the above points,
Air is blown out from the foot opening and the defroster opening
An object of the present invention is to suppress fogging of the inside of the vehicle windshield when the two-layer mode is set in the blowout mode .

[0008]

Means for Solving the Problems] The present inventors, off
Cut opening (15) and defroster opening (16)
When the two-layer mode is set in the blowing mode that blows air from the air, the two-layer mode is set by paying attention to the fact that air with a slightly higher humidity is blown into the inner surface of the vehicle windshield than in the case of setting the whole outside air mode. It has been devised to achieve the above object by increasing the amount of air blown from the defroster outlet at the time compared to when setting the all outside air mode.

That is, according to the first to sixth aspects of the present invention, the first air passage (1) leading to the foot opening (15) is provided.
3) and a second air passage (14) communicating with the defroster opening (16). In the inside / outside air mode, inside air is introduced into the first air passage (13) and the second air passage (14) is introduced into the second air passage (14). and two-layer mode for introducing outside air, can be set and the total outside air mode for introducing outside air into the first air passage (13) and the second air passage (14), the foot opening (1
5) and blow air from the defroster opening (16)
When the blow mode is set, the ratio of the amount of air blown out from the defroster opening (16) is larger when the two-layer mode is set than when the whole outside air mode is set.

Thus, the foot opening (15) and
A blowout mode that blows air from the defroster opening (16)
When the two-layer mode is set, since the ratio of the amount of air blown out from the defroster opening (16) is larger than that in the setting of the whole outside air mode, the foot opening (15) and the foot opening (15) are set.
Blower that blows air from the defroster opening (16)
When the mode is set, the anti-fog property of the vehicle windshield when the two-layer mode is set can be improved, and the inner surface of the vehicle windshield can be prevented from fogging.

According to the second aspect of the present invention, the door means (19), (18) for controlling the air flow to the foot opening (15) and the defroster opening (16).
And a foot opening (15) and a defroster opening
In the setting of the blowout mode for blowing air from (16) , the opening / closing door is set so that the ratio of the amount of air blown out from the defroster opening (16) is larger when the two-layer mode is set than when the whole outside air mode is set. The positions of the means (19) and (18) are set. In this way, the present invention can be implemented well.

Further, according to the third aspect of the present invention, the foot
Empty from opening (15) and defroster opening (16)
Foot opening (15)
And approximately the same amount of air from the defroster opening (16)
Differential mode that blows air and the foot opening (15)
And blowing air from the defroster opening (16)
In addition, the ratio of the amount of air blown out from the defroster opening (16) is
Smaller foot mode than set differential mode can be set
When setting this foot mode, 2
When the stratified mode is set, the
Make sure that the air flow rate from the froster opening (16) is large.
It is characterized by. Thus, setting the foot mode
When the two-layer mode is set, the
Air flow from defroster opening (16)
Is larger than in the foot differential mode.
When the flow rate from the outlet is small and the foot mode is set
Under conditions where the interior surface of the vehicle windshield is easily fogged
Even when the inside of the vehicle windshield is
Can be controlled. According to the fourth aspect of the present invention , even when the foot differential mode is set, when the two-layer mode is set,
The defroster opening (1
6) Since the ratio of the amount of air blown out is large, even when such a foot differential mode is set, the anti-fog property of the vehicle windshield when the two-layer mode is set can be improved, and the inner surface of the vehicle windshield is prevented from fogging. it can.

According to the fifth aspect of the present invention, the heating means (8) for heating the air in the first and second air passages (13, 14) is provided in the first and second air passages (13, 14). provided by the heating amount adjusting means (11) and by adjusting the air heating amount by the heating means, the foot opening (15) and de
At the time of setting the blowing mode in which air is blown out from the froster opening (16) , when the heating amount of the air is substantially maximized by the heating amount adjusting means (11), the two-layer mode is set. Except when the maximum is set, the all outside air mode is set.

Here, when the amount of air heating is substantially maximized, it means that the heating capacity is insufficient with respect to the target temperature in the vehicle compartment. Layer mode is set. At times other than the maximum time, it means that the heating capacity has surplus to the target temperature. At this time, the whole outside air mode in which the heating capacity is smaller than the two-layer mode is set. . Note that the case where the air heating amount is substantially maximized also includes a case where the air heating amount is slightly smaller than the case where the air heating amount is maximized.

[0015] In the invention according to claim 6 , the side face opening (1) communicating with the side face outlet (172a) for blowing wind toward the inner surface of the vehicle side glass is provided.
71) is provided at the other end of the second air passage (14), and when the foot mode or the foot differential mode is set, air is also blown out from the side face opening (171). When the differential mode is set, the ratio of the amount of air blown out from the side face opening (171) is larger when the two-layer mode is set than when the whole outside air mode is set.

Here, when the two-layer mode is set when the foot mode or the foot differential mode is set, the air having a higher humidity than the above-described outside air passes through the second air passage (14) and the side face outlet (172a). At this time, when the two-layer mode is set, the ratio of the amount of air blown out from the side face opening (171) can be made larger than in the case of setting the whole outside air mode. Can be improved, and the possibility that the inner surface of the vehicle side glass is fogged can be suppressed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this embodiment,
Each of the air-conditioning units in the air-conditioning unit for air-conditioning the interior space of the vehicle equipped with the diesel engine is provided by an air-conditioning control device 3
3 (see FIG. 5; hereinafter, referred to as ECU).

First, the configuration of the air conditioning unit will be described with reference to FIG. FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 2 is a sectional view taken along the line BB in FIG. The air conditioning unit 1 is shown in FIG.
1 is mounted on the vehicle so that the upper side is the front side of the vehicle (engine side), the lower side of FIG. 1 is the rear side of the vehicle (inside of the vehicle compartment), and the horizontal direction of FIG. An air conditioning case 2 forming a passage is provided.

The air-conditioning case 2 is made of a resin material such as polypropylene, and has, in order from the air upstream side, an inside / outside air blowing unit 3, a cooler unit 4, and a heater unit 5.
And are combined. Note that broken lines X and Y in FIG. 1 indicate these binding sites. The inside / outside air blowing unit 3 is for taking in at least one or both of the inside air and the outside air into the air-conditioning case 2, and a blower 6 for generating an air flow is disposed therein. The inside / outside air blowing unit 3 and the blower 6 will be described later with reference to FIG.

In the cooler unit 4, a refrigerant evaporator 7c for cooling the passing air is disposed so as to cover the entire air passage in the air conditioning case 2. This refrigerant evaporator 7c is one component of the refrigeration cycle device 7 mounted on the vehicle. The refrigeration cycle apparatus 7 includes a compressor 7a that compresses refrigerant by the driving force of an automobile engine, a condenser 7b that condenses and liquefies the compressed refrigerant, a receiver 7e that stores liquid refrigerant, and a condensed and liquefied refrigerant. It is a well-known device having a pressure reducing means 7d for reducing the pressure of the refrigerant, and the refrigerant evaporator 7c.

In the refrigeration cycle apparatus 7, when the electromagnetic clutch 7f, which is an on-off means for interrupting the operation of the compressor 7a, is energized, the driving force of the engine is reduced via the electromagnetic clutch 7f. The refrigerant is compressed by the compressor 7a and supplied to the refrigerant evaporator 7c (hereinafter, this state is referred to as the compressor being on). Further, when the power supply to the electromagnetic clutch 7f is cut off, the compressor 7a stops, and the supply of the refrigerant to the refrigerant evaporator 7c is cut off (hereinafter, this state is referred to as the compressor 7a).
b is off). The control of energization of the electromagnetic clutch 7f is performed by an ECU 33 described later.

In the heater unit 5, a refrigerant evaporator 7c is provided.
Is provided with a heater core (heating means, heating heat exchanger) 8 for heating the cool air that has passed through. This heater core 8
2 and 3 are provided in the air conditioning case 2 such that the cool air forms bypass passages 9a and 9b for bypassing the heater core 8.
The cooling water of the engine flows inside, and the heat exchanger uses the cooling water as a heat source to heat the cold air.

A rotary shaft 10 is provided on the upstream side of the heater core 8 so as to be rotatable with respect to the air conditioning case 2. Further, plate-shaped air mix doors (air volume ratio adjusting means) 11a and 11b are integrally connected to the rotating shaft 10 so that their plate surfaces are the same. The air mix door 11a is connected to a first air passage 13 to be described later.
The air mix door 11b is provided in a second air passage 14 described later.

A servo motor 40 (see FIG. 5) is connected to the rotating shaft 10 as a driving means. Then, the rotary shaft 10 is
Is rotated, the air mix door 11 is rotated.
2A, the air mix door 11b rotates integrally from the solid line position to the dashed line position in FIG. 2 from the solid line position to the dashed line position in FIG.

Then, the air mix door 11a is
As shown in FIG. 5, the temperature control means (air heating by the heater core 8) for adjusting the ratio of the amount of the cool air passing through the heater core 8 and the amount of the cool air passing through the bypass passage 9a by adjusting the temperature of the air blown into the vehicle interior. (Heating amount adjusting means for adjusting the amount). The air mix door 11b adjusts the ratio of the amount of cool air passing through the heater core 8 to the amount of cool air passing through the bypass passage 9b, depending on the stop position, as shown in FIG. Functioning as a temperature adjusting means (heating amount adjusting means for adjusting an air heating amount by the heater core 8).

The cooler unit 4 and the heater unit 5 are connected as a connecting means by, for example, a claw fitting or a screw member. In the cooler unit 4 and the heater unit 5, as shown in FIG. 1, a first air passage 13 and a second air passage 13 are formed by a partition wall 12 extending in a substantially vertical direction.
An air passage 14 is defined. The above-described refrigerant evaporator 7c, heater core 8 and rotating shaft 10 are disposed over the first air passage 13 and the second air passage 14.

The partition wall 12 allows the bypass passage 9 to be located on the back side of the air mix doors 11a and 11b on the paper surface, as shown in FIGS.
It is formed in each of the air passage 13 and the second air passage 14. Then, the first downstream end of the air conditioning case 2
On the air passage 13 side, a foot opening 15 is formed, and on the second air passage 14 side of the most downstream end of the air conditioning case 2,
Defroster opening 16, center face opening 170,
Further, a side face opening 171 is formed.

A foot duct (not shown) is connected to the foot opening 15, and the conditioned air introduced into the foot duct flows from the foot outlet at the downstream end of the foot duct to the foot of the passenger in the passenger compartment. It is blown out toward.
A defroster duct (not shown) is connected to the defroster opening 16, and the conditioned air introduced into the defroster duct flows from the defroster outlet at the downstream end of the defroster duct toward the inner surface of the vehicle windshield. Be blown out.

A center face duct (not shown) is connected to the center face opening 170, and the conditioned air introduced into the center face duct flows through a center face outlet, which is the downstream end of the center face duct. It is blown out toward the upper body of the passenger in the cabin. The side face opening 171, the side face duct 17
2 are connected, and this side face duct 172
The conditioned air introduced into the inside of this side face duct 1
72 is blown out toward the vehicle side glass from a side face outlet 172a which is a downstream end.

The openings 15, 16, 17
The foot door 18, the defroster door 19, the center face door 200, and the side face door 201 are provided on the upstream side of 0 and 171. These doors 18,
19, 200, 201 are the openings 15, 16, 1
An opening / closing door for controlling the air flow to 70 and 171 is configured.

The doors 18, 19, 200, 201
Is connected to a link mechanism (not shown).
This link mechanism includes a servo motor 41 as a driving means.
(See FIG. 5). In other words, when the servo motor 41 moves the link mechanism, the rotational positions of the doors 18, 19, 200, and 201 are simultaneously operated in accordance with each of the blowout modes and the inside / outside air modes described later. You.

In the vicinity of the side face outlet 172a of the side face duct 172, an outlet grill 173 for the occupant to manually open and close the side face outlet 172a.
Is provided. The outlet grill 173 also constitutes an opening / closing door for controlling the air flow to the side face opening 171. The partition wall 12 is provided with each of the openings 15.
17 and on the downstream side of the heater core 8, the first air passage 13
A communication hole 21 that communicates with the second air passage 14 is formed. The foot door 18 fully closes the communication hole 21 when the foot opening 15 is fully opened, and fully opens the communication hole 21 when the foot opening 15 is fully closed.

Next, the inside / outside air blowing unit 3 and the blower 6 will be described with reference to FIG. FIG. 4 is a schematic perspective view seen from the direction of arrow B in FIG. The inside / outside air blower unit 3 includes an inside / outside air case 3a that constitutes the most upstream side of the air conditioning case 2 and the blower 6 housed in the inside / outside air case 3a. The blower 6 is disposed substantially at the center in the inside / outside air case 3a, and includes a first fan 6a, a second fan 6b, and a blower motor 6c for driving these fans 6a, 6b to rotate. Here, the first fan 6a and the second fan 6b are formed integrally, and the diameter of the second fan 6b is larger than the diameter of the first fan 6a.

The first fan 6a and the second fan 6b are housed in scroll casing portions 22 and 23 each having a bell mouth shape on the suction side. The end portions (air blowing side) of the scroll casing portions 22 and 23 communicate with the first air passage 13 and the second air passage 14, respectively. In addition, the scroll casing parts 22 and 23 share the partition part 24.

On the other hand, in the inside / outside air case 3a, a first inside air suction port 26 is formed corresponding to the suction port 25 of the first fan 6a, and corresponding to the suction port 27 of the second fan 6b,
A second inside air suction port 28 and an outside air suction port 29 are formed. In the inside / outside air case 3a, a first suction port opening / closing door 30 for opening / closing the first inside air suction port 26 and a second suction / opening door 29 for selectively opening / closing the second inside air suction port 28 and the outside air suction port 29 are provided. An inlet opening / closing door 31 is provided.

The first inside air suction port 26 is formed closer to the suction port 25 than the second inside air suction port 28 is. The first inlet opening / closing door 30 is a door whose position is controlled according to whether or not the air mixing doors 11a and 11b are at a max hot position (maximum heating position) described later. Second inlet opening / closing door 3
Reference numeral 1 denotes a door whose position is controlled in accordance with the inside / outside air mode, as described later.

The first suction port opening / closing door 30 and the second suction port opening / closing door 31 are connected to servo motors 42 and 43 (see FIG. 5) as respective driving means. By means of 42 and 43, they rotate between the solid line position and the dashed line position in the figure.
A communication passage 3 that connects the second inside air suction port 28 or the outside air suction port 29 to the suction port 25 is provided in the inside / outside air case 3a.
2 are formed. When the first air inlet opening / closing door 30 fully opens the first air inlet 26 (the position indicated by the solid line in FIG. 4), the communication passage 32 is fully closed, and the first air inlet 26 is completely closed. At this time (in the position indicated by the chain line in FIG. 4), the communication passage 32 is fully opened.

Next, the configuration of the control system of this embodiment will be described with reference to FIG. The ECU 33 that controls each air-conditioning unit of the air-conditioning unit 1 receives signals from each switch (for example, a temperature setting switch for an occupant to set the vehicle interior set temperature) on an operation panel 34 provided on the front of the vehicle interior. Is entered. The ECU 33 also includes an internal air temperature sensor 35 for detecting a vehicle interior temperature (air temperature in the vehicle interior, hereinafter referred to as internal air temperature), an external air temperature sensor 36 for detecting a temperature outside the vehicle interior (air temperature outside the vehicle interior, hereinafter referred to as external air temperature), A solar radiation sensor 37 for detecting the amount of solar radiation radiated into the vehicle interior, a water temperature sensor 38 for detecting the temperature of the engine cooling water flowing into the heater core 8, and a degree of air cooling of the refrigerant evaporator 7c (specifically, passing through the evaporator. A signal from the post-evaporator sensor 39 for detecting the temperature of the air immediately after) is input.

Further, the ECU 33 includes an air conditioner switch 50 for manually turning on and off the compressor 7a by an occupant.
Connected as input terminal. Note that the post-evaporator sensor 39 is installed in the first air passage 13 as shown in FIG. Here, a well-known microcomputer including a CPU, a ROM, a RAM, and the like (not shown) is provided inside the ECU 33. And each of the sensors 3
A signal (Tr) obtained by A / D converting the detection values of 5, 36, 37, 38, and 39 by an input circuit (not shown) in the ECU 33.
, Tam, Ts, Tw, and Te) are input to the microcomputer. In addition, EC
U33 is supplied with power from a battery (not shown) when an ignition switch (not shown) of the engine of the automobile is turned on.

Next, control processing of the microcomputer of the present embodiment will be described with reference to FIG. First, when the ignition switch is turned on and power is supplied to the ECU 33, the routine shown in FIG. 6 is started, each initialization and initial setting are performed in step 100, and in the next step 110, the temperature setter is used. Enter the set temperature.

Then, in the next step 120, a signal obtained by A / D converting the detection values of the sensors 35 to 39 is read. Then, in the next step 130, the target outlet temperature (TAO) into the vehicle compartment is calculated based on the following equation 1 stored in the ROM in advance.

[0042]

## EQU1 ## TAO = Kset × Tset−Kr × Tr−Kam ×
Tam−Ks × Ts + C where Tset is the temperature set by the above temperature setting device, Tr,
Tam and Ts are detection values (A / D converted signals) of the sensors 35, 36, and 37, respectively. Also, Kset, Kr,
Kam and Ks are gains, and C is a correction constant.

Next, at step 140, a blower voltage (voltage applied to the blower motor 6c) corresponding to the TAO is calculated from a map (not shown) stored in the ROM in advance. Then, in the next step 150, the ROM
The blowout mode corresponding to the above TAO is determined from a map (not shown) stored in the storage device. In the determination of the blowing mode, the TAO is determined to be a face mode, a bi-level mode, a foot mode, and a foot differential mode from the lower side to the higher side.

In the face mode, the foot door 18 is positioned at the dashed line in FIG. 1 (the foot opening 18 is fully closed, and the degree of opening relative to the foot opening 18 is zero), and the defroster door 19 is positioned at the solid line (defroster opening). 19 fully closed,
The opening degree of the defroster opening 19 is zero), the center face door 200 is positioned in a dashed line (the center face opening 170 is fully opened, the opening degree of the center face opening 170 is 60 °), and the side face door 201 is positioned in a dashed line ( In this mode, the conditioned air is blown toward the upper body of the vehicle occupant, with the side face opening 171 being fully opened and the opening with respect to the side face opening 171 being 60 °).

In the bi-level mode, the foot door 18 is moved to a solid line position (the foot opening 18 is fully opened,
, The defroster door 19 is in a solid line position, the center face door 200 is in a position to open the center face opening 170 by about half (center face opening 1).
70 is fully opened, the opening degree with respect to the center face opening 170 is 30 °), and the side face door 201 is set at a position where the side face opening 171 is opened by about half (the opening degree with respect to the side face opening 171 is 30 °). Is blown out toward the occupant's upper body and feet.

The foot differential mode means that the foot door 18 is in a solid line position, the defroster door 19 is in a dashed line position (the opening degree to the defroster opening 19 is 30 °), the center face door 200 is in a solid line position, and the side face door is a side face. In this mode, the air-conditioning air is blown to the foot of the occupant and to the inner surface of the windshield by the same amount at a position where the opening 171 is slightly opened (the opening with respect to the side face opening 171 is 10 °).

The foot mode means that the foot door 18 is in the solid line position, the defroster door 19 is in the position in which the defroster opening 16 is slightly opened (when the mode is not the two-layer mode described later, the opening with respect to the defroster opening 171 is 5 ° (blowout). In the case of the two-layer mode described later, the opening with respect to the defroster opening 171 is 8 ° (the blowing ratio increasing position), and the center face door 200 is in the solid line position (the center face opening 170 is fully closed, the center is closed). Face opening 1
70 is zero), the side face door 201
Is set to a position where the side face opening 171 is slightly opened (when the mode is not a two-layer mode described later, the opening degree with respect to the side face opening 171 is 10 ° (normal blowing ratio position). Face opening 17
In this mode, most of the air-conditioned air is blown toward the feet of the occupant, and a small amount is blown toward the inner surface of the windshield when the opening angle with respect to 1 is 15 ° (blowing ratio increasing position).

In the present embodiment, in the foot mode and the foot differential mode, the amount of air blown out from each of the outlets (and, consequently, each of the openings 15, 16, 171, 1).
The above doors 18, 19, 200, and 2 are arranged such that the amount of air blown from the air outlet 72 is the amount of air blown as shown in the table of FIG.
An opening degree (position) of 01 is set. In the present embodiment, when a defroster switch (not shown) provided on the operation panel 34 is operated, the foot door 18 and the defroster door 19 are set to a dashed line position, the center face door 200 is set to a solid line position, and the side face door 201 is set to a side position. A mode in which the conditioned air is blown toward the inner surface of the windshield is set at a position where the face opening 171 is slightly opened.

In any of the blowing modes, the side face outlet 172a is connected to the outlet grill 173.
Can always be opened and closed by the occupant manually operating the vehicle.
Then, in step 160, the target opening (SW) of the air mix door 11 is calculated based on the following mathematical expression 2 stored in the ROM in advance. The air mix door 11
Since a and 11b rotate integrally, the air mixing door 11 is simply referred to as an air mixing door 11 in the present embodiment.

[0050]

## EQU00002 ## SW = ((TAO-Te) / (Tw-Te)). Times.100 (%) When calculated as SW.ltoreq.0 (%), the air mix door 11 is moved from the refrigerant evaporator 7c. Is controlled to a position where all of the cool air is passed through the bypass passages 9a and 9b. When it is calculated that SW ≧ 100 (%), the air mix door 11 is controlled to a position where all of the cold air passes through the heater core 8. Then, 0 (%) <SW <10
When calculated as 0 (%), the cool air is controlled to a position where it passes through both the heater core 8 and the bypass passage 9.

At the next step 170, a subroutine shown in FIG. 7 is called to determine the positions of the first suction port opening / closing door 30 and the second suction port opening / closing door 31. Specifically, in step 1000 of FIG.
The inside / outside air mode is determined from the map of FIG. 8 stored in the OM. In this step 1000, a full inside air mode in which inside air is introduced into the first air passage 13 and the second air passage 14,
Alternatively, an outside air introduction mode for introducing outside air into at least the second air passage 14 is determined. As the outside air introduction mode, a two-layer mode in which inside air is introduced into the first air passage 13 and outside air is introduced into the second air passage 14, and a two-layer mode in which outside air is introduced into the first air passage 13 and the second air passage 14. The outside air mode is set. In this embodiment, the step 1000 constitutes an outside air introduction mode setting means and an all inside air mode setting means.

Then, in the next step 1100, it is determined whether or not the inside / outside air mode determined in step 1000 is the outside air introduction mode. Here, when NO is determined, that is, when it is determined as the all inside air mode, the process jumps to step 1600, where the first inlet opening / closing door 30 is set to the solid line position in FIG. It is determined as the position of the dashed line in FIG. Thereafter, the process exits this subroutine.

If the result of the determination in step 1100 is YES, in the next step 1200, the blowing mode determined in step 150 (see FIG. 6) is changed to the foot mode (FOOT) or foot differential. Mode (F / D) is determined. That is, it is determined whether or not the mode is one in which both heating of the vehicle interior and anti-fog of the window glass are performed. If the determination in step 1200 is NO, the process jumps to step 1500 to move the first inlet opening / closing door 30 to the position indicated by the alternate long and short dash line in FIG.
1 is determined as the position of the solid line. That is, the all outside air mode is determined. Thereafter, the process exits this subroutine.

On the other hand, if YES is determined in step 1200, then in step 1300, the target opening SW of the air mix door 11 calculated in step 160 (see FIG. 6) is 100 (%). It is determined whether or not this is the case. That is, the air mix door 11 is connected to the refrigerant evaporator 7c.
Where all of the cool air from the heater passes through the heater core 8 (see FIGS. 2 and 3).
It is determined whether or not the position is controlled to the solid line position (max hot position described above).

Here, if the determination is NO, it means that the heating capacity is surplus with respect to the target temperature, and the process proceeds to step 1500, where
The mode is such that outside air is introduced into the insides 3 and 14. Conversely,
When the determination is YES, it means that the heating capacity is insufficient with respect to the target temperature, and the process proceeds to step 1400 to change the positions of the first suction port opening / closing door 30 and the second suction port opening / closing door 31. Each is determined as the position of the solid line in FIG. That is, the two-layer mode is determined. Thereafter, the process exits this subroutine.

When the series of processing in FIG. 7 is completed in this way, the process proceeds to step 180 in FIG. 6, and it is determined whether or not the foot mode (FOOT) is set. If the determination in step 180 is YES, the process proceeds to step 190,
The above steps 1000, 1100, 1200, 1300
It is determined whether or not the inside / outside air mode determined in is the two-layer mode.

If the determination in step 190 is YES, the process proceeds to step 200 and the defroster door 1
9 and the position of the side face door 201 are determined as the above-described blowout ratio increasing positions. If NO is determined in step 190, the process proceeds to step 210, and the positions of the defroster door 19 and the side face door 201 are determined as the above-described normal blowing ratio positions. Here, steps 180, 190, 200,
210 constitutes a door position determining means for determining the positions of the defroster door 19 and the side face door 201.

When a series of processes is completed in this manner, the process proceeds to step 220, and the modes (door positions) calculated or determined in the above steps are obtained.
A control signal is output to each of the motors 6c, 40 to 43. Then, in the next step 210, the flow returns to step 110 after elapse of the control cycle time τ. As described above, according to the present embodiment, as shown in the table of FIG. 9, when the foot mode is set, the two-layer mode is set more than the defroster outlet (that is, the whole outside air mode). Since the ratio of the amount of air blown out from the defroster opening 16) is large, when the foot mode is set, the anti-fog property of the vehicle windshield when the two-layer mode is set can be improved, and the inner surface of the vehicle windshield is prevented from fogging. it can.

When the foot mode is set, when the side grill 173 is opened, that is, the side face outlet 172a (side face opening 171).
When the two-layer mode is set, the ratio of the amount of air blown out from the side face outlet 172a is larger when the two-layer mode is set than when the whole outside air mode is set. The antifogging property of the vehicle side glass at the time of setting can be improved, and the inside of the vehicle side glass can be prevented from fogging.

In this embodiment, step 1 in FIG.
When it is determined in 100 that the mode is the all inside air mode, the inside air is introduced into the first air passage 13 with the first intake opening / closing door 30 at the solid line position in FIG. Here, this door 30
4, the inside air is introduced into the first air passage 13, but in the case of this embodiment, the first
Since the inside air is introduced from the first inside air suction port 26 closer to the suction port 25 than the second inside air suction port 28 far from the suction port 25 of the fan 6a, the ventilation resistance can be reduced and a larger air volume can be obtained. .

In this embodiment, one first inlet opening / closing door 30 is connected to the first inside air inlet 26 and the communication passage 32.
Is opened and closed, so that the number of parts can be reduced as compared with the case where a door that opens and closes the first inside air suction port 26 and a door that opens and closes the communication passage 32 are provided. (Other Embodiments) In the above embodiment, even when the foot differential mode is set, when the two-layer mode is set,
The defroster door 19 is set so that the ratio of the amount of air blown out from the defroster outlet is larger than when the whole outside air mode is set.
(The normal blowout ratio position and the blowout ratio increasing position) may be set. As a result, even when the foot differential mode is set, the anti-fog property of the vehicle windshield when the two-layer mode is set can be improved, and the inside of the vehicle windshield can be prevented from fogging.

Further, in the above embodiment, even when the foot differential mode is set, the ratio of the amount of air blown out from the side face outlet 172a is larger when the two-layer mode is set than when the whole outside air mode is set. Thus, the position of the side face door 201 may be set. As a result, even when the foot differential mode is set, the anti-fogging property of the vehicle side glass when the two-layer mode is set can be improved, and the inside of the vehicle side glass can be prevented from fogging.

Further, the side face door 201 in the above embodiment may be omitted. In this case, the ratio of the amount of air blown out from the side face outlet 172a cannot be automatically switched between the setting of the two-layer mode and the setting of the all outside air mode. Further, in the above embodiment, when the air mix door 11 is located at a position where all the cool air from the refrigerant evaporator 7c passes through the heater core 8, the amount of air heating is substantially maximized. Occasionally, a slight amount (for example, 10%) of wind was generated in the bypass passage 9a,
The state of flowing through 9b may be included as the time when the amount of air heating is substantially maximized.

It should be noted that the ratio of the amount of air blown out from each of the outlets as described in the above embodiment (see FIG. 9) is not limited. However, it is only necessary to set the ratio of the amount of air blown from each of the above outlets so that the ratio of the amount of air blown from the defroster air outlet becomes larger than when the all outside air mode is set. In the above-described embodiment, the doors 18 and 19 constitute the opening / closing means described in the claims, and the door 201 constitutes the side face opening / closing means described in the claims. , 171 and 172 may be constituted by a single film door which simultaneously opens and closes the opening and closing means and the side face opening and closing means.

In the above embodiment, the air mix door 1 is operated in the foot mode or the foot differential mode.
Only when 1 was at the max hot position, the two-layer mode was set, but regardless of the opening of the air mix door 11,
2 when in foot mode or foot differential mode
The present invention can be applied to an air conditioner in a layer mode.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

FIG. 4 is a schematic perspective view seen from the direction of arrow B in FIG. 1;

FIG. 5 is a block diagram of a control system according to the embodiment.

FIG. 6 is a flowchart showing a control process by the microcomputer of the embodiment.

FIG. 7 is a flowchart showing a process in step 170 of FIG. 6;

FIG. 8 is a diagram illustrating an inside / outside air mode according to the present embodiment.

FIG. 9 is a table showing the ratio (%) of the amount of air blown out from each outlet in the foot mode and the foot differential mode of the embodiment.

[Explanation of symbols]

13: first air passage, 14: second air passage, 15: foot opening, 16: defroster opening.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Goro Uchida 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. (72) Inventor Yuki Kato 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (56) References JP-A-60-8105 (JP, A) JP-A-2-112573 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60H 1/00 103

Claims (6)

(57) [Claims] 1. A first air passage (13) leading to a foot opening (15) communicating with a foot outlet for blowing air toward the feet of an occupant in a vehicle compartment, and a defroster for blowing air toward the inner surface of a vehicle windshield. A second air passage (14) communicating with a defroster opening (16) communicating with the air outlet, and introducing inside air into the first air passage (13) in an inside / outside air mode, as well as introducing the second air passage ( and two-layer mode for introducing outside air into 14), and full outside air mode for introducing outside air into the first air passage (13) and the second air passage (14) has a settable, the foot opening ( 15) and the defroster opening
(16) Hey when setting the blowing mode to blow air from
The air conditioner for a vehicle according to claim 1, wherein when the two-layer mode is set, the ratio of the amount of air blown out from the defroster opening (16) is larger than when the whole outside air mode is set. 2. Opening / closing door means (19), (18) for controlling air flow to the foot opening (15) and the defroster opening (16), wherein the foot opening (15) and the defroster are provided. Aperture
(16) Hey when setting the blowing mode to blow air from
Te, setting of the two-layer mode than said settings of all outside air mode, as airflow volume ratio of from the defroster opening (16) increases, said door means (19), (18)
The vehicle air conditioner according to claim 1, wherein the position is set. 3. The foot opening (15) wherein said foot opening (15)
Blow-out mode that blows air from the froster opening (16)
The foot opening (15) and the defrost
Foot that blows approximately the same amount of air from the opening (16)
The differential mode, the foot opening (15) and the differential
Blow air from the froster opening (16)
The ratio of the amount of air blown out from the defroster opening (16) is
Smaller foot mode than foot differential mode can be set
When this foot mode is set, the two-layer mode
At the time of setting, the differential is higher than at the time of setting of the all outside air mode.
A large ratio of the amount of air blown out from the roster opening (16)
The vehicle air conditioner according to claim 1 or 2, wherein: 4. When the foot differential mode is set,
Also, when the two-layer mode is set, the all-outside air mode is set.
Blowout from the defroster opening (16)
4. The air flow rate is large.
The vehicle air conditioner according to any one of the above. 5. The first and second air passages (13, 1 ).
4) and in these air passages (13, 14).
A heating means for heating the air (8), heating amount for adjusting the air heating amount by the heating means (8)
Adjusting means (11) for controlling the heating amount when the foot mode is set.
Step (11) maximizes the amount of air heating substantially
Set the two-layer mode when
Other than the above, the whole outside air mode is set.
The vehicle according to any one of claims 1 to 4,
Dual use air conditioner. 6. Wind is blown toward the inner surface of the vehicle side glass.
Rhino that communicates with the outgoing side face outlet (172a)
The face opening (171) is connected to the second air passage (1).
4) is provided on the other end side, when the foot mode or the foot differential mode is set.
In the above, also from the side face opening (171)
Air is blown out, and in the foot mode or the foot differential mode,
At the time of setting, when setting the two-layer mode,
Than when the air mode is set, the side face opening
(171) is characterized in that the ratio of the amount of air blown out is large.
A vehicle according to any one of claims 1 to 5,
Air conditioner.