JP2000280724A - Vehicular air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold the constant outside air introducing amount even if the air blowing quantity by a blower is fluctuated as well as to perform heat exchange and moisture exchange between discharging inside air and introducing outside air. SOLUTION: The air blowing quantity of one motor 10 for driving an outside air introducing impeller 9 and an inside air circulating impeller 25 is detected by an air blowing quantity detecting means 100, and a first door 11 for adjusting the amount of outside air passing through a sensible heat exchanger 7 and a second door 24 for adjusting the amount of inside air passing through the sensible heat exchanger 7 are adjusted by an air exchanging amount adjusting means 110 so as to maintain the outside air introducing amount and the inside air discharging amount constant in relation to the air blowing quantity. Therefore, the outside air introducing amount and the inside air discharging amount can be made constant even if the revolutions of the motor are fluctuated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a vehicle and circulates inside air, and can exchange a part of the inside air and outside air at a predetermined ratio without changing the air blowing condition of the air conditioner. The present invention relates to a vehicle air conditioner.

[0002]

2. Description of the Related Art A "deodorizing, dehumidifying and cooling method using an adsorbent having a deodorizing and dehumidifying function" disclosed in Japanese Patent Application Laid-Open No. Hei 5-115737 discloses a method in which a sucked high-temperature and high-humidity outside air is subjected to a humidity exchange rotor and a heat exchange rotor. It exchanges humidity and heat with the inside air that is passed and discharged, and further humidifies the air to continuously supply it to the vehicle interior as air having the optimum temperature and humidity.

Further, the dehumidification type air conditioner disclosed in Japanese Patent Application Laid-Open No. 6-221618 discloses a total heat exchanger for exchanging total heat between the introduced outside air and exhaust gas, and an air conditioner in the outside air passing through the total heat exchanger. A dehumidifying rotor that adsorbs and desorbs moisture to and from a hygroscopic material, a cooling coil that cools outside air that has passed through the dehumidifying rotor, and a regeneration heater that heats exhaust air from a living room to dry and regenerate the hygroscopic material of the dehumidifying rotor. Is provided. As a result, part of the inside air sucked from the living room
Heat is exchanged with the introduced outside air by the two heat exchangers, the total heat exchanger and the sensible heat exchanger. After being heated by the regenerative heater, it is discharged outside through the dehumidifying rotor that dehumidifies the outside air, and is sucked from the living room. The remaining part of the inside air is heat-exchanged with a part of the inside air, mixed with the introduced outside air dehumidified by the dehumidification rotor by the mixer, and returned to the living room.

Further, an air conditioner for a vehicle disclosed in Japanese Patent Application Laid-Open No. H10-16531 discloses that a first air passage is provided with outside air,
At the time of the mode in which the inside air is introduced into the air passage, in order to reduce heat loss due to the introduction of the outside air, the first air passage from the outside air inlet to the defroster outlet air passage, and the first air passage from the outside air inlet to the foot outlet air passage. A second air passage,
An inside air discharge passage for discharging inside air to the outside of the vehicle compartment;
A heat exchanger that absorbs heat from the inside air flowing through the inside air discharge passage and radiates heat to the outside air introduced from the outside air inlet when the mode in which outside air is introduced into the air passage and inside air is introduced into the second air passage. The heat of the outside air is used to raise the temperature of the outside air to reduce the heat loss due to the introduction of the outside air. Thereby, the first fan that sucks the inside air and the outside air switched by the door and blows it to the downstream side of the air conditioning duct, sucks the inside air, discharges a part of the inside air to the outside air, and leaves the rest to the downstream side of the air conditioning duct. The second fan that blows air is driven by one motor, the outside air is sucked by the first fan and sent to the downstream side of the air conditioning duct, and a part of the inside air is discharged by the second fan, and the total heat is released. The heat exchange between the outside air sucked in by the exchanger and the inside air discharged is performed.

[0005] Furthermore, the vehicle air conditioner disclosed in Japanese Patent Application Laid-Open No. 5-147423 reduces the cooling load,
The purpose of this is to provide sufficient transient air conditioning such as cool-down. During cool-down, the passenger compartment air is sucked by the sub-flow fan and blown out of the sub-flow outlet grill into the passenger compartment to make the occupants feel cool. When the air conditioning control is shifted to a stable air conditioning control, the heat exchange between the warm air that has passed through the outside air intake duct and the cold air that is sucked in by the substream fan and passes through the exhaust duct is performed by the total heat exchanger, which leads to the evaporator. The outside air is cooled so that the cooling load of the evaporator can be reduced.

[0006]

However, the invention disclosed in the above-mentioned Japanese Patent Application Laid-Open No. HEI 5-115737 discloses a blower that sucks indoor air and sends it to the heat exchange rotor side, and sucks air that passes through the humidity exchange rotor. And a blower that sucks and discharges air bypassing the humidity exchange rotor, and all the blowers are provided on the inside air discharge passage side. Is sucked by Therefore, in order to properly control the amount of outside air introduced, the amount of inside air that exchanges humidity with outside air, and the amount of inside air that exchanges temperature, it is necessary to consider the airflow balance of each blower. There is a disadvantage that very difficult control is required to obtain the inside air amount for exchanging heat with the air.

In the invention disclosed in Japanese Patent Application Laid-Open No. Hei 6-221618, the moisture contained in the introduced outside air is removed by the dehumidifying rotor, and the dehumidified outside air is mixed with the inside air and passes through the cooling coil. Therefore, the air blown into the room becomes extremely dry air. In the case of this reference, since the purpose is to obtain dry air, the purpose can be achieved, but it can be said that it is not suitable for being mounted on a vehicle as an air conditioner for a vehicle.

Further, the invention disclosed in Japanese Patent Application Laid-Open No. H10-16531 exchanges heat between the outside air introduced by the first fan and the inside air exhausted by the second fan. Heat loss due to
As the rotation speed of the blower increases, the amount of outside air introduced increases with the increase in the rotation speed of the first fan, but the amount of inside air discharge increases only at a predetermined rate of the rotation speed of the second fan. There is a problem that the heat to the introduced outside air given by the discharged inside air cannot catch up with the increase of the introduced outside air. In addition, an increase in the amount of outside air introduced increases the amount of air leaked from the vehicle interior, so that there is a problem that the energy loss of the air conditioning control itself is large.

Further, the invention disclosed in Japanese Patent Application Laid-Open No. 5-147423 discloses an outside air sucked by a first blower fan and sent out into a room, and an inside air sucked and discharged by a second blower fan. And heat exchange with a total heat exchanger. In this case, the amount of introduced outside air is controlled by a motor that rotates the first blowing fan, and the amount of inside air discharged is controlled by a motor that rotates the second blowing fan. In addition, when the amount of air blown into the vehicle interior is increased by the first blower fan, the amount of outside air introduced inevitably increases, and the amount of air in the vehicle interior leaking from the vehicle interior increases.
There is a problem that the energy loss of the air conditioning control itself is large.

[0010] The amount of introduced air required to discharge the carbon dioxide concentration in the vehicle compartment depends on the size of the vehicle and the like, but may be a predetermined fixed value, specifically, about 50 m ³ / h. Should be fine.

From the above, the vehicle air conditioner according to the present invention exchanges heat and moisture between the exhaust air and the introduced external air, and maintains a constant amount of the external air even if the amount of air blown by the blower fluctuates. To provide a vehicle air conditioner.

[0012]

SUMMARY OF THE INVENTION Therefore, an air conditioner for a vehicle according to the present invention, as shown in FIG.
Temperature control means including a cooling means 28 and a heating means 29 disposed therein, an outside air introduction duct 3 connected to the air conditioning duct 2, and sucking air passing through the outside air introduction duct 3 to blow air into the air conditioning duct An impeller 9 for introducing outside air, an impeller 25 for circulating inside air for sucking air inside the vehicle and blowing the air into the air conditioning duct; a motor for driving the impeller 9 for introducing outside air and the impeller 25 for circulating inside air; Air discharge duct 20 that branches off from the downstream side of the impeller 9 and discharges part of the internal air, and sensible heat that exchanges heat between the external air passing through the external air introduction duct 3 and the internal air passing through the internal air discharge duct 20 An exchanger 7, a dehumidifying rotor 6 for exchanging humidity between outside air passing through the outside air introduction duct 3 and inside air passing through the inside air discharge duct 20, and the outside air introduction duct Wherein the introduction external air heater 5 that is disposed upstream of the dehumidification rotor 6, the inner air discharge duct 20
And a discharge inside air heater 23 disposed upstream of the dehumidification rotor 6.
Is passed through the dehumidification rotor 6 and then passes through the sensible heat exchanger 7 to reach the impeller 9 for introducing outside air, and part of the inside air passing through the inside air discharge duct 20 is used for circulation of inside air. In the vehicle air conditioner 1 which passes through the sensible heat exchanger 7 from the downstream side of the impeller 25 and then passes through the dehumidifying rotor 6 and is discharged to the outside of the vehicle cabin, the vehicle air conditioner 1 is provided in the outside air introduction duct 3, A first door 11 for adjusting the amount of outside air passing through the inner air discharge duct 20; a second door 24 for adjusting the amount of inside air passing through the sensible heat exchanger 7; A sending amount detecting means 100 for detecting the amount of air blown by a motor for driving the impeller 9 and the inside air circulation impeller 25, and a blowing amount detecting means 100 for maintaining the outside air introduction amount and the inside air discharge amount at predetermined values. Detection result Therefore, it is to comprise an air exchange amount adjusting means 110 for adjusting while cooperating the opening of the first door 11 and the second door 24.

Therefore, according to the present invention, the amount of air blown by one motor driving the impeller 9 for introducing outside air and the impeller 25 for circulating inside air is detected by the blown air amount detecting means 100, and the amount of air blown by the outside air is detected. A first door 11 for adjusting the amount of outside air passing through the sensible heat exchanger 7 so as to keep the amount of introduction and the amount of inside air discharged constant;
And the second door 24, which adjusts the amount of inside air passing through, is adjusted by the air exchange amount adjusting means 110.
Even if the number of revolutions of the motor fluctuates, the amount of outside air introduced and the amount of inside air discharged can be kept constant, thereby suppressing an increase in the concentration of carbon dioxide in the passenger compartment and ensuring good air quality. .

A vehicle air conditioner 1 according to the present invention.
Is further provided with a humidity detecting means 120 for detecting a vehicle interior humidity.
And selectively operate the introduced outside air heater 5 and the discharged inside air heater 23 in accordance with the detection result of the humidity detecting means 120 so as to maintain a predetermined vehicle interior humidity, and dehumidify and dehumidify the dehumidification rotor 6. And a dehumidifying amount adjusting means 130 for adjusting the amount.

More specifically, in the present invention, the dehumidification amount adjusting means 130 stops the discharge inside air heater 23 when the vehicle interior humidity detected by the humidity detecting means 120 falls below a predetermined value. In addition, the introduction outside air heater 5 is operated to heat the introduction outside air, and the humidity reduction prevention control for adding the moisture contained in the discharge inside air to the introduction outside air via the dehumidification rotor 6 is performed. Thus, when the vehicle interior is dried below a predetermined value, the moisture contained in the exhaust air can be collected and returned to the introduced external air, thereby preventing a decrease in the humidity in the vehicle interior.

Further, in the present invention, the dehumidification amount adjusting means 130 stops the introduced outside air heater 5 when the vehicle interior humidity detected by the humidity detecting means 120 exceeds a predetermined value, and The discharge inside air heater 23 is operated to heat the discharge inside air and perform dehumidification control for removing moisture contained in the introduced outside air from the introduced outside air via the dehumidification rotor 6. Thus, when the humidity in the vehicle compartment increases, the introduced outside air can be dehumidified, so that the humidity in the vehicle compartment can be reduced.

Further, the vehicle air conditioner 1 according to the present invention further comprises a temperature detecting means 14 for detecting the temperature inside the vehicle.
0, and the dehumidification amount adjusting means 130 determines that the vehicle interior humidity detected by the humidity detecting means 120 exceeds a predetermined value and the vehicle interior temperature detected by the temperature detecting means 140 is equal to or less than a set value by an occupant. When it is determined that there is, the cooling means 28 disposed in the air conditioning duct 2 is stopped, the introduction outside air heater 5 is stopped, and the discharge inside air superheater 28 is operated to heat the discharge inside air. The dehumidification control is performed by the dehumidification rotor 6 to add moisture contained in the introduced outside air to the discharged inside air to dehumidify. Accordingly, when it is required to perform dehumidification without lowering the room temperature, such as during rainy season in the middle period (spring / autumn), it is possible to dehumidify the introduced outside air without operating the cooling means.

Further, in the present invention, it is desirable that the air exchange amount adjusting means 110 equalize the outside air introduction amount and the inside air discharge amount, and the air exchange amount adjusting means 110 is provided with the outside air introduction amount. May be made larger than the inside air discharge amount. As a result, energy loss due to inside air discharge can be suppressed, and at the same time, the interior of the vehicle can be made positive pressure to prevent dirty outside air from entering the interior of the vehicle.

The vehicle air conditioner 1 according to the present invention.
Further, as shown in FIG. 2, the air conditioner includes air condition detecting means 150 for detecting an air condition outside the vehicle, and the air exchange amount adjusting means 110 detects the air condition outside the vehicle detected by the air condition detecting means 150. Is worse, the outside air introduction amount is made larger than the inside air discharge amount. Thus, only when the ambient air condition is deteriorated (for example, NO _X and increase soot), it is possible to be larger than the inside air emissions outside air introduction amount, it is capable to minimize the energy loss due to internal air exhaust .

Further, the vehicle air conditioner 1 according to the present invention is further formed along the outside air introducing duct 3 and the air conditioning duct 2 as shown in FIG. A bypass passage 60 extending to the defroster outlet 30 via the sensible heat exchanger 7 and the outside air introduction impeller 9 and a bypass door 61 for opening and closing the bypass passage 60 are provided. If prevention of fogging of windshield is required,
The bypass door is opened to open a bypass passage, and outside air bypass means for directly blowing outside air from a defroster outlet is provided. Thereby, since the humidity of the introduced outside air is low during the humidity reduction prevention control, when the windshield is fogged, the bypass passage can be opened and the outside air can be directly blown on the windshield, so that the fogging of the windshield can be prevented.

The vehicle air conditioner 1 according to the present invention.
Further includes an inside air introduction port formed in the outside air introduction duct 3 and communicating the downstream side of the sensible heat exchanger 7 with the vehicle interior, and an inside / outside air door 13 for opening and closing the inside air introduction port,
At the time of full cool and full hot control, the first door 11 and the second door 24 are closed, the outside air introduction duct 3 and the inside air discharge duct 20 are closed, and the inside and outside air door 13 is opened, so that the outside air introduction impeller 9 is opened. In addition, the inside air circulation impeller 25 sends the inside air into the air conditioning duct 2. Thereby, in the case of full cool and full hot, a complete internal air circulation cycle can be constructed.

Furthermore, it is desirable to provide a dust collector / deodorizer 27 upstream of the cooling means 28 of the air conditioning duct 2.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in order to explain the present invention in more detail, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 5 to 7, an air conditioner 1 for a vehicle according to an embodiment of the present invention includes an air conditioning duct 2 having an impeller 9 for introducing outside air and an impeller 25 for circulating inside air on the upstream side, and an outside air. An outside air introduction duct 3 provided between the introduction port 4 and the suction port 8 of the outside air introduction impeller 9.
(3A, 3B), an inside air outlet 21 and an inside air discharge port 2 provided near the downstream side of the inside air circulation impeller 25.
The inside air discharge duct 20 (20A, 2A)
0B).

The air-conditioning duct 2 is provided with a dust collecting or deodorizing device 27 and an evaporator 2 as cooling means downstream of the impeller 9 for introducing outside air and the impeller 25 for circulating inside air.
8 and a heater core 29 as a heating means. The evaporator 28 forms a refrigeration cycle together with at least the compressor 34, the condenser 35, and the expansion valve 36 controlled by the electromagnetic clutch 37, and cools the passing air. The heater core 29 normally uses engine cooling water as a heat source, and the amount of heating is adjusted by adjusting the amount of water with a water valve (not shown). Further, a defroster (DEF) outlet 30, a vent (VENT) outlet 31, and a foot (FOOT) outlet 32 are opened at the most downstream of the air conditioning duct 2, and are appropriately opened and closed by mode doors 33A, 33B, and 33C. Things. The air-conditioning duct 2 is provided with an inlet 26 of the inside air circulation impeller 25.

The outside air introduction duct 3 and the inside air discharge duct 20 are provided with a dehumidification rotor 6 through which the respective ducts 3 and 20 pass. This dehumidification rotor 6
For exchanging humidity with the passing air itself, if the humidity of the material constituting the rotating element is lower than the humidity of the passing air, deprive the passing air of moisture and pass the opposite If the humidity is higher than the air humidity, moisture is added to the passing air. The outside air inlet 4 is located upstream of the outside air introduction duct 3 of the dehumidification rotor 6.
The heater 5 for introducing outside air is provided in the vicinity of the inside air, and the heater 23 for discharging inside air is provided on the upstream side of the inside air discharge duct 20 of the dehumidification rotor 6.

The outside air introduction duct 3 and the inside air discharge duct 20 are arranged so as to intersect with each other by the sensible heat exchanger 7, and the outside air passing through the outside air introduction duct 3 and the inside air discharge duct 20 are connected to each other. Heat exchange takes place with the passing exhaust air. The introduced outside air passing through the sensible heat exchanger 7 is
The amount of air passing through the first door 11 disposed upstream of the sensible heat exchanger 7 is adjusted.
The amount of discharged inside air passing through the second door 24 arranged downstream of the discharged inside air of the sensible heat exchanger 7 is adjusted.

The sensible heat exchanger 7 is, for example, as shown in FIG. 8, in which the corrugated fins 7C and 7D are interposed between the end plates 7A and 7B arranged on both sides of the sensible heat exchanger 7 via the flat plate 7E so that the flow direction is vertical. And are arranged alternately as described above.

Further, in the outside air introduction duct 3,
In the part 3B between the sensible heat exchanger 7 and the suction port 8,
Second inside air inlet 1 opened and closed by inside / outside air door 13
2 is an opening.

In the vehicle air conditioner 1 having the above configuration,
The operation of the motor 10 causes the impeller 9 for introducing outside air and the impeller 25 for circulating inside air to rotate, thereby causing the first inside air introduction port 2 to rotate.
The inside air sucked from the inside 6 by the inside air circulation impeller 25 is filtered through a dust collector or a deodorizer 27, temperature-controlled by an evaporator 28 and a heater core 29, and through predetermined outlets 30, 31, 32 into the vehicle interior. Blow out.

A part of the inside air sucked by the rotation of the inside air circulation impeller 25 and sent to the downstream side of the air conditioning duct 2 has an amount limited by the opening degree (θ2) of the second door 24, After flowing into the upstream portion 20A of the inside air discharge duct 20 from the inside air outlet 21 and passing through the sensible heat exchanger 7 and exchanging heat with the introduced outside air, the dehumidifying rotor 6 exchanges humidity with the introduced outside air to obtain the inside air outlet. Discharged from 22.

Further, the amount of the introduced outside air sucked from the outside air introduction port 4 by the operation of the outside air introduction impeller 9 is limited by the opening degree (θ 1) of the first door 11, and discharged by the dehumidification rotor 6. The sensible heat exchanger 7 exchanges heat with the exhaust air to be sent out into the air conditioning duct 2.

Then, like the inside air sucked by the inside air circulation impeller 25, the introduced outside air is filtered through a dust collector or deodorizer 27, temperature-controlled by an evaporator 28 and a heater core 29, and is subjected to predetermined blowing. Exit 30,
Air blows from the interior of the vehicle from 31, 32.

A control unit 51 is provided to control the vehicle air conditioner 1 described above. The control unit 51 is a known unit including at least a central processing unit (CPU) (not shown), a read-only memory (ROM), a random access memory (RAM), an input / output port (I / O), and the like. Sensor 45 for detecting the humidity of the vehicle, a temperature sensor 46 for detecting the temperature in the passenger compartment, a temperature sensor 47 for detecting the temperature of the outside air, a pollution detection sensor 48 for detecting the pollution of the outside air, and an actuator for driving the first door 11 The first emanating from 40
, An opening signal from the actuator 41 for driving the second door 24, and a rotation signal from the motor 10 for driving the impeller 9 for introducing outside air and the impeller 25 for circulating inside air. A signal is input through a multiplexer (MPX) 49 and an A / D converter 50, and a setting signal or the like set by an operation panel 52 is input and converted into a control signal by a predetermined program. A heater control unit 38 for controlling the heating heater 5;
Control unit 39 for controlling the first door 1
1 and the second door 24
, The mode door 33
The actuator 42 drives the A, 33B, and 33C, the actuator 43 drives the inside / outside air door 13, and the rotating device 44 that rotates the dehumidifying rotor 6.

FIGS. 9 and 10 are flowcharts showing a part of the air conditioning control executed by the control unit 51. FIG.

The flowchart shown in FIG. 9 shows the control of the heater (heater) 5 for heating the introduced outside air and the heater (heater) 23 for heating the discharged inside air. The heater control started from step 200 is performed in step 2
At 10, it is determined whether the humidity Hinc detected by the vehicle interior humidity detection sensor 45 is smaller than a predetermined value γ1. In this determination, the vehicle interior humidity Hinc is γ1
When it is determined that the temperature is smaller than the predetermined value, it is necessary to suppress the drying of the passenger compartment. Therefore, the process proceeds to step 210 to operate the heater 5 for introducing outside air, and the process proceeds to step 220 to stop the heater 23 for discharging inside air. , From step 330 to another control routine.

As a result, the introduced outside air FO1 introduced from the outside air introduction port 4 is heated to lower the relative humidity.
The moisture of the discharged internal air FI4 is added to the introduced external air FO1 by the dehumidifying rotor 6. Furthermore, the humidified introduction outside air F0
(2) The sensible heat exchanger 7 exchanges heat with the exhausted internal air to lower the temperature because the temperature decreases, and the relative humidity increases. Can be done.

If it is determined in step 210 that the vehicle interior humidity Hinc is equal to or higher than the predetermined value γ1, the routine proceeds to step 230, where the vehicle interior humidity Hinc is determined.
It is determined whether or not inc is greater than a predetermined value γ2.
In the determination at step 230, the vehicle interior humidity Hinc
Is less than or equal to a predetermined value γ2 (γ2> γ1), it can be said that the vehicle interior humidity Hinc is within a predetermined range, and therefore, Step 2
The routine proceeds to 40, where the heater 5 for introducing outside air is stopped, and the routine proceeds to step 250, where the heater 23 for discharging inside air is stopped.

If it is determined in step 230 that the vehicle interior humidity Hinc is greater than the predetermined value γ2, the routine proceeds to step 260, where the vehicle interior temperature Tinc detected by the temperature sensor 46 is set by the operation panel 52. It is determined whether it is equal to or less than Tset. If it is determined in step 260 that the vehicle interior temperature Tinc is higher than the set temperature Tset (N), the routine proceeds to step 270, where the compressor (COMP) 34 is operated, and the vehicle interior temperature Tinc is lower than the set temperature Tset. In case (Y),
Proceeding to step 280, the compressor (COMP) 34 is stopped. Then, in step 290, the heater 5 for heating the introduced outside air is stopped, in step 300, the heater 23 for discharging inside air is operated, and the process proceeds from step 330 to another control.

Accordingly, when the vehicle interior humidity Hinc is high and the vehicle interior temperature Tinc is higher than the set temperature Tset, the cooling and dehumidification of the blown air is necessary. Evaporator 28
In addition to performing cooling (including dehumidification) of the blown-out air by the cooling by, the dehumidification of the introduced outside air is performed.

More specifically, a part FI3 of the inside air FI1 sucked by the inside air circulation impeller 25 exchanges heat with the introduced outside air in the sensible heat exchanger 7, and the temperature rises and the relative humidity falls to be discharged. Since the inside air FI4 is formed and further heated by the inside air heating heater 23, the relative humidity decreases, and the dehumidification rotor 6 is deprived of moisture and dried. Thus, the dried dehumidification rotor 6 absorbs moisture from the introduced outside air FO1 and dehumidifies to obtain dehumidified introduced outside air FO2. Then, the introduced outside air FO2 is cooled by exchanging heat with the discharged inside air in the sensible heat exchanger 7 and then cooled again by the evaporator 28.
, And is blown out into the vehicle interior, so that the humidity in the vehicle interior can be reduced.

When the vehicle interior humidity Hinc is high and the vehicle interior temperature Tinc is lower than the set temperature Tset, only the dehumidification is required.
Is stopped, and the temperature drop of the air blown out by the evaporator 28 is suppressed.

More specifically, a part FI3 of the inside air FI1 sucked by the inside air circulation impeller 25 is subjected to heat exchange with the outside air by heat exchange by the sensible heat exchanger 7 to lower the temperature. Since the heating is performed by the heating unit 23, the relative humidity decreases, and the moisture is deprived from the dehumidifying rotor 6 and dried. Thus, the dried dehumidification rotor 6 absorbs moisture from the introduced outside air FO1 and dehumidifies to obtain dehumidified introduced outside air FO2. Then, since the introduced outside air FO2 is heated by exchanging heat with the discharged inside air in the sensible heat exchanger 7, the relative humidity decreases, and the humid air is directly blown out into the vehicle interior, so that the humidity in the vehicle interior can be reduced. it can.

FIG. 10 shows the first and second doors 11, 24.
It is a flowchart figure regarding control of. Step 40
In step 410, the door control starting from 0 is full cool (rapid cooling) / full hot (rapid heating).
Is determined (FC / FH?), And if the mode is the full cool mode / full hot, the process proceeds to step 420, where the inside / outside air door 13 is opened, and the process proceeds to step 430, where the first door is opened. 11 is closed, the process proceeds to step 440, the second door 24 is closed, and the process proceeds from step 510 to another control.

As a result, the vehicle air conditioner 1 is
1, the upstream side portion 3A of the outside air introduction duct 3
Is separated from the sensible heat exchanger 7 by the first door 11, and furthermore, the sensible heat exchanger 7 is
Although not shown in FIG. 11, the sensible heat exchanger 7 and the downstream side of the inside air discharge duct 20 are shut off by the second door. Since the introduction and the inside air discharge can be completely stopped, and the suction port 8 of the outside air introduction impeller 9 and the second inside air introduction port 12 can be directly communicated, the full cool / full hot control is executed. Is what you can do.

If it is determined in step 410 that it is not full cool / full hot, the process proceeds to step 450, in which the inside / outside air door 13 is closed, and proceeds to step 460, where the contamination concentration Dr is smaller than the predetermined value λ. When it is determined that the rotation speed F of the motor 10
Is multiplied by a predetermined constant α to calculate the door opening θ1 of the first door 11, and further proceeds to step 480 to multiply the rotation speed F of the motor 10 by a predetermined constant β to obtain the second door 24. Is calculated. The constants α and β are calculation constants set so that the outside air introduction amount and the exhaust inside air amount become equal to the rotation speed F of the motor.

As a result, the vehicle air conditioner 1 is
13 and the airflow of each duct with respect to the rotation speed of the motor 10 is as shown in FIG. FIG.
In the graph, FT denotes the impeller 9 for introducing outside air and the impeller 25 for circulating inside air with respect to the rotation speed of the motor 10.
The outside air introduction amount FED is substantially the same as the FED 'with the rotation of the outside air introduction impeller 9, and the outside air introduction amount FED is increased by a predetermined value (for example,
50 m ³ / h) or more, the first door 11
Is adjusted so as to maintain the outside air introduction amount at a predetermined value.

In order to keep the heat exchange rate with the outside air introduction amount constant, the discharge inside air amount is also adjusted by the opening degree θ2 of the second door 24. In this case, the inside air amount FAD ′ passing through the inside of the air conditioning duct 2A by the inside air circulation impeller 25 is:
Since the amount of discharged internal air that increases with the rotation of the internal air circulation impeller 25 is limited by the second door 24,
Since the surplus amount excluding the exhausted internal air amount discharged in accordance with the external air introduction amount is added to the internal air amount FAD ', the actual internal air amount is indicated by FAD. The sum of the introduction amount FED becomes equal to the total air amount FT.

From the above, since the outside air introduction amount and the discharge inside air amount are adjusted to be constant by the first and second doors 11 and 24 regardless of the fluctuation of the rotation of the motor 10,
The heat exchange rate between the intake outside air and the exhaust inside air can be kept constant, and loss due to an increase in the exhaust inside air can be prevented.

If it is determined in step 460 that the contamination concentration Dr is larger than the predetermined value λ, the flow advances to step 490 to multiply the rotation speed F of the motor 10 by a predetermined constant α ′. Is calculated by multiplying the rotation speed F of the motor 10 by a predetermined constant β ′ to calculate the door opening θ2 of the second door 24. is there. The constants α ′ and β ′ are calculation constants set so that the outside air introduction amount becomes larger than the exhaust inside air amount by a predetermined value with respect to the rotation speed F of the motor.

For this reason, when the contamination concentration Dr is larger than the predetermined value λ, the opening degree θ1 of the first door 11 is set to be larger than in the case where the outside air introduction amount and the inside air introduction amount are equalized. Since it is set, the outside air introduction amount can be made larger than the inside air introduction amount, so that the pressure in the vehicle interior becomes positive pressure with respect to the pressure outside the vehicle, thereby preventing the contamination outside air from entering the vehicle interior. It is.

A vehicle air conditioner 1 shown in FIG. 14 is formed along the outside air introduction duct 3 and the air conditioning duct 2, bypasses the dehumidification rotor 6, and has the sensible heat exchanger 7 and the outside air introduction impeller. It further includes a bypass passage 60 extending to the defroster outlet 30 ′ through the bypass passage 9, and a bypass door 61 that opens and closes the bypass passage 60. In the vehicle air conditioner 1, the outside air introduction duct 3 is provided with an upstream portion 3A 'in which a first portion 60A of a surrounding bypass passage is formed and a downstream portion in which a second portion 60B of the bypass passage is formed around the upstream portion. The downstream side of the downstream portion 3B 'is configured so that the outside air passing through the bypass passage 60 is smoothly discharged to the third portion 60C formed in the air conditioning duct 2. And a flapper portion 81 whose diameter is enlarged in a flapper shape. In this embodiment, the same portions as those in the above-described embodiment and portions having similar effects are denoted by the same reference numerals, and description thereof is omitted.

In the vehicle air conditioner 1 having the above configuration, as shown in FIG. 9, when the dehumidification reduction control in the vehicle interior is executed in steps 210 and 220, the windshield is prevented from fogging in step 310. It is determined whether or not a request has been made. If the request has been made, the process proceeds to step 320, where the bypass door 61 is opened to open the bypass passage 60. If not, the process proceeds to step 330. It is to be. As a result, since the outside air in this case has a low humidity, the low-humidity outside air can be directly blown onto the windshield, so that fogging of the Freon and the glass can be prevented.

In the vehicle air conditioner shown in FIG. 15, the first door 11 'and the second door 24' are constituted by a plurality of narrow dampers so that the vertical dimension of the air conditioning duct 2 can be reduced. It was done. Thus, the first and second
By changing the shape of the door, the outside air introduction duct 3
In addition, since the size of the inside air discharge duct 20 can be set freely, such a configuration does not pose a problem in mounting the vehicle.

[0055]

As described above, according to the present invention, the amount of outside air introduced can be kept constant irrespective of the rotation speed of the impeller for introducing outside air, so that a rise in carbon dioxide concentration is suppressed and good air quality is secured. Is what you can do.

Further, since the outside air introduction amount is equal to or larger than the inside air introduction amount, energy loss due to inside air discharge can be suppressed and, at the same time, the interior of the vehicle compartment is made to have a positive pressure. Therefore, it is possible to prevent dirty outside air from entering the passenger compartment.

Further, since the dehumidification of the introduced outside air is made possible by the humidity in the vehicle interior, a comfortable vehicle interior environment can be realized while suppressing an increase in energy due to dehumidification.

[Brief description of the drawings]

FIG. 1 is a first block configuration diagram of a vehicle air conditioner according to the present invention.

FIG. 2 is a second block diagram of the vehicle air conditioner according to the present invention.

FIG. 3 is a third block diagram of the vehicle air conditioner according to the present invention.

FIG. 4 is a block diagram showing a configuration of the vehicle air conditioner at the time of full cool / full hot.

FIG. 5 is a schematic configuration diagram showing a configuration of a vehicle air conditioner according to the present invention.

FIG. 6 is a front sectional view showing an example of a vehicle air conditioner.

FIG. 7A is a side sectional view showing an example of a vehicle air conditioner, and FIG. 7B is a plan view.

FIG. 8 is a perspective view showing an example of a sensible heat exchanger.

FIG. 9 is a flowchart illustrating heater control.

FIG. 10 is a flowchart illustrating door control.

FIG. 11 is a side sectional view showing the vehicle air conditioner at the time of full cool / full hot.

FIG. 12A is a front sectional view showing the vehicle air conditioner during normal control, and FIG. 12B is a side sectional view thereof.

FIG. 13 is a graph showing the relationship between the motor rotation speed and the air volume of each duct.

14A is a front sectional view showing a vehicle air conditioner having a bypass passage, and FIG. 14B is a side sectional view thereof.

FIG. 15 is a front sectional view showing a vehicle air conditioner having different shapes of first and second doors, and FIG. 15 (b) is a side sectional view thereof.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 air conditioner for vehicle 2 air conditioning duct 3 outside air introduction duct 5 heater for introduction outside air heating 6 dehumidification rotor 7 sensible heat exchanger 9 impeller for introduction of outside air 10 motor 11 first door 13 inside and outside air door 23 heater for exhaust inside air heating 24 2 door 25 Impeller for inside air circulation 27 Dust collector or deodorizer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroki Nagayama 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. Central Research Laboratory (72) Inventor Hiroaki Harada 2 Takaracho 2-kanagawa-ku, Yokohama-shi, Kanagawa Inside the Central Research Laboratory (72) Inventor Shinichi Hara 39, Higashihara, Chiyo, Odai-gun, Osato-gun, Saitama Prefecture Inside of the Xexel Gangnam Plant (72) Inventor Naoto Hayashi 39, Higashihara, Chiyo, Odai-gun, Osato-gun, Saitama 39 F term in the Gangnam factory (reference) 3L011 AF02 AP02 BE01 CH03

Claims (11)

[Claims] 1. An air conditioning duct comprising a cooling means and a heating means arranged in an air conditioning duct, an outside air introduction duct connected to the air conditioning duct, and an air passing through the outside air introduction duct for sucking air passing through the air conditioning duct. An impeller for introducing outside air into the inside, an impeller for circulating inside air for sucking air in the passenger compartment and blowing the air into the air conditioning duct, a motor for driving the impeller for introducing outside air and the impeller for circulating inside air, and An inside air discharge duct that branches off from the downstream side of the impeller and discharges part of the inside air, a sensible heat exchanger that performs heat exchange between outside air passing through the outside air introduction duct and inside air passing through the inside air discharge duct, A dehumidification rotor for performing humidity exchange between outside air passing through the outside air introduction duct and inside air passing through the inside air discharge duct; and an upstream side of the dehumidification rotor of the outside air introduction duct. An introduction outside air heater arranged in
At least a discharge inside air heater disposed on the upstream side of the dehumidification rotor of the inside air discharge duct, and outside air passing through the outside air introduction duct passes through the sensible heat exchanger after passing through the dehumidification rotor. To the impeller for introducing outside air, and a part of the inside air passing through the inside air discharge duct,
An air conditioner for a vehicle, which passes through the sensible heat exchanger from the downstream side of the inside air circulation impeller and then passes through the dehumidifying rotor and is discharged to the outside of the passenger compartment, is provided in the outside air introduction duct and passes through the sensible heat exchanger. A first door for adjusting the amount of outside air to be supplied; a second door provided on the inside air discharge duct to adjust the amount of inside air passing through the sensible heat exchanger; the outside air introduction impeller and the inside air circulation impeller An air blowing amount detecting means for detecting an air blowing amount of a motor for driving the first and the first air according to a detection result of the air blowing amount detecting means so as to maintain an outside air introduction amount and an inside air discharge amount at predetermined values.
An air-conditioning apparatus for a vehicle, comprising: an air exchange amount adjusting means for adjusting the opening of the second door and the second door in cooperation with each other. 2. The vehicle air conditioner further comprises: a humidity detecting means for detecting a vehicle interior humidity; and the introduced outside air heater according to a detection result of the humidity detecting means so as to maintain a predetermined vehicle interior humidity. The vehicle air conditioner according to claim 1, further comprising: a dehumidification amount adjusting unit that selectively operates the exhaust air heater and adjusts a dehumidification amount of the dehumidification rotor. 3. The dehumidifying amount adjusting means stops the discharge inside air heater and activates the introduction outside air heater when the vehicle interior humidity detected by the humidity detecting means falls below a predetermined value. The vehicle air conditioner according to claim 2, wherein the control unit performs heating control for preventing the decrease in humidity by heating the introduced outside air and adding moisture contained in the discharged inside air to the introduced outside air via the dehumidification rotor. 4. The dehumidifying amount adjusting means stops the introduced outside air heater and activates the discharged inside air heater when the vehicle interior humidity detected by the humidity detecting means exceeds a predetermined value. The vehicle air conditioner according to claim 2 or 3, wherein dehumidification control is performed for heating the discharged inside air and removing moisture contained in the introduced outside air from the introduced outside air via the dehumidification rotor. 5. The vehicle air conditioner further includes a temperature detecting means for detecting a vehicle interior temperature, wherein the dehumidification amount adjusting means is adapted to adjust the vehicle interior humidity detected by the humidity detecting means to a value exceeding a predetermined value. When it is determined that the cabin temperature detected by the temperature detecting means is equal to or less than a set value by the occupant, the cooling means disposed in the air conditioning duct is stopped and the introduced outside air heater is stopped. Along with operating the discharge inside air superheater to heat the discharge inside air,
The vehicle air conditioner according to any one of claims 2 to 4, wherein the dehumidification rotor performs dehumidification control for adding moisture contained in the introduced outside air to the discharged inside air to dehumidify. 6. The air conditioner for a vehicle according to claim 1, wherein the air exchange amount adjusting unit equalizes the outside air introduction amount and the inside air discharge amount. 7. The air conditioner for a vehicle according to claim 1, wherein the air exchange amount adjusting unit sets the outside air introduction amount to be larger than the inside air discharge amount. 8. The vehicle air conditioner further comprises an air condition detecting means for detecting an air condition outside the vehicle, and the air exchange amount adjusting means comprises an air condition detecting means for detecting the outside air condition detected by the air condition detecting means. 8. The air conditioner for a vehicle according to claim 7, wherein the amount of the outside air introduced is made larger than the amount of the inside air discharged when the temperature is poor. 9. The vehicle air conditioner further includes a defroster formed along the outside air introduction duct and the air conditioning duct, bypassing the dehumidification rotor, and passing through the sensible heat exchanger and the outside air introduction impeller. A bypass passage extending to the air outlet; and a bypass door for opening and closing the bypass passage. When the prevention of fogging of the windshield is required during the humidity reduction prevention control, the bypass door is opened to open the bypass passage. The vehicle air conditioner according to any one of claims 3 to 8, further comprising an outside air bypass unit that is opened and allows the outside air to be directly blown out from the defroster outlet. 10. The vehicle air conditioner further includes an inside air inlet formed in the outside air introduction duct and communicating a downstream side of the sensible heat exchanger with a vehicle interior, and an inside / outside opening / closing the inside air inlet / outlet. And at the time of full cool and full hot control, the first door and the second door are closed to close the outside air introduction duct and the inside air discharge duct, and the inside and outside air door is opened to open the outside air introduction port. The vehicle air conditioner according to any one of claims 1 to 9, wherein both the impeller and the impeller for circulating inside air blow the inside air into the air conditioning duct. 11. A vehicle air conditioner according to claim 1, wherein a dust collector and deodorizer are provided upstream of said cooling means of said air conditioning duct.