JP2000289455A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively conduct the dehumidification regeneration of a dehumidifying rotor and secure the heat radiation quantity on a high-pressure line by providing a sub-condenser between the condenser of a refrigerating cycle and an expanding means, and arranging the sub-condenser in the upstream of the dehumidifying rotor in an inside air discharge duct. SOLUTION: An air conditioner duct 6 is arranged on the blowout side of a blast device 5 constituted of an outside air introducing impeller 2, an inside air introducing impeller 3 and a motor 4. An evaporator 13 constituting a refrigerating cycle 12 together with a compressor 8, a condenser 9, a sub-condenser 10 and an expansion valve 11 is arranged in the air conditioner duct 6, and a heater core 14 is provided in the downstream of the evaporator 13. During a cooling operation, the sub-condenser 10 arranged between the condenser 9 and the expansion valve 11 makes a heat radiating action together with the condenser 9, thus the discharge inside air passing through the sub-condenser 10 is heated to dry a dehumidifying rotor 26, thereby the humidity of the introduced outside air can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner capable of exchanging heat and humidity between outside air and inside air.

[0002]

2. Description of the Related Art An air conditioner for a vehicle disclosed in Japanese Patent Application Laid-Open No. 10-16531 has a first passage formed from an outside air inlet to a defroster outlet air passage, and a first passage formed from an inside air inlet to a foot outlet air passage. A second passage, and an inside air discharge passage for discharging inside air to the outside of the vehicle compartment, and furthermore, inside air flowing through the inside air discharge passage in a mode in which outside air is introduced into the first air passage and inside air is introduced into the second air passage. Equipped with a total heat exchanger that absorbs heat from the outside air and radiates heat to the outside air introduced from the outside air inlet, and can use the heat of the inside air to raise the temperature of the outside air introduced, reducing heat loss due to the introduction of outside air Is what you do.

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 introduced outside air and exhaust gas, and a total heat exchanger passing through the total heat exchanger. A dehumidifying rotor that adsorbs and desorbs moisture into and from a hygroscopic material, a sensible heat exchanger that exchanges heat with the exhaust air passing through the dehumidifying rotor, and cools the outside air that passes through the sensible heat exchanger and draws it into the living room. A cooling coil and a regeneration heater for heating exhaust gas from the living room to dry and regenerate the hygroscopic material of the dehumidifying rotor,
In addition to obtaining practical dry air, the temperature of cold water produced by the refrigerator is raised to improve the COP of the refrigerator.

[0004]

However, the air conditioner for a vehicle disclosed in Japanese Patent Application Laid-Open No. H10-16531 does not have a sufficient dehumidifying and replacing function. Therefore, when outside air is introduced during a cooling operation, air having a lot of latent heat is generated. Since the case where the evaporator is reached occurs, cooling power in the evaporator is required, and there is a problem that the power saving effect is not sufficiently exhibited.

When a dehumidifying air conditioner disclosed in Japanese Patent Application Laid-Open No. 6-221618 is mounted on a vehicle, it is necessary to secure a heat source for a regeneration heater for drying and regenerating a dehumidifying rotor due to a problem of battery capacity. Occurs.

Accordingly, the present invention provides an air conditioner for a vehicle that includes a sub-condenser in a refrigeration cycle and uses the sub-condenser as a regeneration heater of the dehumidifying rotor to dehumidify introduced outside air during a cooling operation. To provide.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention has a suction motor including one motor, and an impeller for introducing outside air and an impeller for introducing inside air, which are driven by the motor. And an air-conditioning duct arranged on the outlet side of the impeller for inside air introduction, having a plurality of air outlets opening into the vehicle interior and a mode door selectively opening the air outlets, and being arranged in the air-conditioning duct,
At least a compressor, an evaporator constituting a refrigeration cycle together with a condenser and expansion means, a heater core for heating the passing air, an outside air introduction duct communicating with an outside air introduction port opening outside the vehicle and a suction port of the outside air introduction impeller, An inside air discharge duct that communicates an opening of the air conditioning duct near the outlet side of the inside air introduction impeller and an inside air discharge opening that opens outside the vehicle; an outside air passing through the outside air introduction duct; and the inside air discharge duct And a dehumidifying rotor for exchanging humidity between the exhaust air passing through the refrigeration cycle, and a sub-condenser provided between the condenser of the refrigeration cycle and the expansion means. It is arranged in the duct on the upstream side of the dehumidification rotor.

Accordingly, during the cooling operation, the sub-condenser arranged in series with the condenser between the condenser and the expansion means performs a heat-radiating action together with the condenser, so that the exhaust air passing through the sub-condenser is heated, and the dehumidification is performed. Since the rotor is dried, the discharged outside air passing through the other side of the dehumidification rotor is dehumidified by the dehumidification rotor, so that the humidity of the introduced outside air can be reduced.

Further, according to the present invention, since a heat exchanger for exchanging heat between the introduced outside air passing through the outside air introduction duct and the discharged inside air passing through the inside air discharge duct is provided, the temperature of the introduced outside air is reduced. Since the temperature can be reduced by the exhaust air, it is possible to prevent an increase in the temperature of the vehicle interior due to the introduction of the external air.

Further, the present invention provides a first door for opening and closing the outside air introduction duct, a second door for opening and closing the inside air discharge duct, target temperature setting means for setting a target temperature in the vehicle interior, and a vehicle. A vehicle interior temperature detecting means for detecting an indoor temperature; and a first and a second, wherein a temperature difference between the vehicle interior temperature detected by the vehicle interior temperature detecting means and the target temperature setting means is a predetermined value or more. A first cooling means for closing the door of No. 2 and setting the rotation speed of the motor to a maximum; and when the temperature difference between the vehicle interior temperature and the target temperature in the vehicle interior is smaller than a predetermined value, the first cooling means. And normal cooling means for opening the second door, arbitrarily setting the number of rotations of the motor, and operating the dehumidifying rotor.

Thus, when the temperature difference between the actual temperature in the vehicle compartment (vehicle compartment temperature) and the target temperature is equal to or more than a predetermined value, rapid cooling needs to be performed. The door is closed, the motor is rotated at the maximum speed to perform rapid cooling, and if the temperature difference is equal to or less than a predetermined value, the first cooling operation is performed.
In addition, since the second door is opened and the motor rotation speed can be set arbitrarily and the dehumidifying rotor can be operated, appropriate cooling control can be performed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

The air conditioner 1 for a vehicle shown in FIG. 1 has a blower 5 composed of an impeller 2 for introducing outside air, an impeller 3 for introducing inside air, and a motor 4 for driving them. Is provided with an air conditioning duct 6.

In the air conditioning duct 6, for example, a compressor 8 which is driven through an electromagnetic clutch 7 and compresses the refrigerant, a condenser 9 provided on the discharge side of the compressor 8 for condensing a high-temperature and high-pressure refrigerant, An evaporator 13 constituting a refrigeration cycle 12 is disposed together with a sub-condenser 10 arranged in series with the expansion condenser 9 and an expansion valve 11 for adiabatically expanding the refrigerant passing through the sub-condenser 10. Further, on the downstream side of the evaporator 13, a heat source is provided. The engine cooling water is used as a heater core 1 and the supply amount of the engine cooling water is adjusted by a flow control valve 15.
4 are provided. Also, on the most downstream side of the air conditioning duct 6,
Differential outlet 16, vent outlet 17, and foot outlet 1
8 is opened, and selectively opened by mode doors 19a, 19b, 19c.

An upstream introduction duct 22 is provided between the outside air inlet 20 and the outside air inlet 21 of the impeller 2 for introducing outside air.
and an outside air discharge duct 22 composed of a downstream air inlet duct 22b and an inside air outlet 22 and an inside air outlet 23 which are open to the air conditioning duct 6 near the air outlet side of the inside air inlet impeller 3 of the blower device 5. Is provided with an inside air exhaust duct 24 composed of an upstream exhaust duct 24a and a downstream exhaust duct 24b.

A sensible heat exchange is provided between the upstream introduction duct 22a and the downstream introduction duct 22b of the outside air introduction duct 22, and between the upstream exhaust duct 24a and the downstream exhaust duct 24b of the inside air exhaust duct 24. Vessel 25 is provided,
The introduced outside air passing through the outside air introduction duct 22 and the discharge inside air passing through the inside air discharge duct 24 flow so as to cross each other in the sensible heat exchanger 25 so that heat is exchanged between them. Is what it is. The sensible heat exchanger 25 in this embodiment is a known cross-flow type heat exchanger.

The dehumidifying rotor 26 is composed of a cylindrical suction section 26a made of a hygroscopic material and a drive section 26b consisting of a motor for rotating the suction section 26a. 26a is
It rotates so as to traverse the upstream introduction duct 22a and the downstream exhaust duct 24b around the center between the upstream introduction duct 22a of the outside air introduction duct 22 and the downstream exhaust duct 24b of the inside air exhaust duct 24. .

Further, a sub-condenser 10 constituting a part of the refrigeration cycle 12 is disposed between the dehumidification rotor 27 and the sensible heat exchanger 25 in the downstream discharge duct 24b.

The upstream introduction duct 22a includes:
A first door 27 that opens and closes the outside air inlet 21 or the outside air introduction duct 22 is provided, and a second door that opens and closes the inside air outlet 23 or the inside air discharge duct 24 is provided in the downstream discharge duct 24b. 28 are provided.

A control unit (C / U) 29 is provided to control the vehicle air conditioner 1 having the above configuration. The control unit 29 is a device known per se 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. A temperature sensor 3 for detecting at least the temperature in the vehicle compartment
0, detection signals from the temperature sensor 31 and the like for detecting the outside air temperature, and various setting signals from the operation panel 32 (including a setting signal for setting a target value of the vehicle interior temperature) are input;
After performing arithmetic processing by a predetermined program, the control signal is transmitted to each control device, for example, an actuator 33 for driving the first door 27, an actuator 34 for driving the second door 28,
The electromagnetic clutch 7 and the drive unit 26 of the dehumidification rotor 26
b, the flow control valve 15, and the mode door 19a,
These are output to the actuator 34 for driving 19 b and 19 c and the motor 4 of the blower 5.

Hereinafter, a part of the program executed by the control unit 29 will be described with reference to a flowchart shown in FIG. The A / C control started from step 100 is periodically started from a main control routine that is the basis of the control of the entire air conditioner, and the vehicle interior temperature T detected by the temperature sensor 30 in step 110.
and the target temperature Tset in the vehicle interior set on the operation panel 32, and the set temperature Tset is compared with the vehicle interior temperature Tset.
If it is higher than r, the routine proceeds to step 120, where heating control is executed.

Although this heating control is not particularly related to the present invention, the operation of the compressor 8 is stopped, the flow control valve 15 is opened, and the opening thereof is adjusted to adjust the amount of engine cooling water supplied to the heater core 14. And adjust the heater core 1
It is preferable that heating is performed by adjusting the amount of heating in step 4. When the heating capacity is large, the compressor 8 may be operated to cool the air passing through the evaporator 13 once, and then heat the heater core 14. Further, the first and second doors 27 and 28 may be opened so that the sensible heat exchanger 25 exchanges heat between the introduced outside air and the discharged inside air.

If it is determined in step 110 that the set temperature Tset is lower than the vehicle interior temperature Tr, a cooling operation is required. In step 130, the temperature difference between the vehicle interior temperature Tr and the set temperature Tset is a predetermined value α (for example, 5 ° C. to 10 ° C.).
In the case above, rapid cooling is required, so the routine proceeds to step 140, where the first door 27 and the second door 2
8 is closed, and the routine proceeds to step 150, where the compressor (C
OMP) 8 is operated (ON), and the motor 4 of the blower (FAN) 5 is fixed at the maximum (MAX) in step 160 to achieve rapid cooling. Then, the process returns from step 210 to the main control routine.

If it is determined in step 130 that the temperature difference between the vehicle interior temperature Tr and the set temperature Tset is smaller than a predetermined value α, normal cooling is required. 2 doors 27 and 28 are opened, and a compressor (COMP) 8
Is operated (ON), the blower 5 is automatically controlled in step 190, the dehumidifying rotor 26 is operated (ON) in step 200, and the process returns to the main control routine from step 210.

When the compressor 8 is operated in the step 180, the refrigerant compressed by the compressor 8 radiates heat and condenses in the condenser 9 and the sub-condenser 10, so that the refrigerant passes through the sub-condenser 10. Since the discharged inside air is heated, the discharged inside air removes the moisture contained in the suction portion 26a of the dehumidification rotor 26 from the suction portion 26a, and the suction portion 26a is regenerated.

The control of the blower (FAN) 5 in step 190 is performed, for example, as shown in FIG. 3 by various environmental factors such as a vehicle interior temperature, an outside air temperature, an amount of solar radiation,
The supply voltage Vf supplied to the motor 4 of the blower 5 based on the target outlet temperature Xm calculated from the set temperature and the like.
Is calculated based on the characteristic diagram shown in FIG. 3 and supplied.

In this embodiment, the first and second doors 27 and 28, the blower 5, the compressor 8, and the dehumidifying rotor 26 are controlled based on the temperature difference between the vehicle interior temperature and the set temperature. However, the control may be performed by adding a humidity factor to this. Further, the enthalpy may be calculated from the temperature and humidity of the air, and the enthalpy and the temperature or the enthalpy and the humidity may be controlled to be optimal.

[0028]

As described above, according to the present invention, the sub-condenser constituting a part of the refrigeration cycle is used as the heater for performing the dehumidification regeneration of the dehumidification rotor.
Since the heat radiation in the high-pressure line can be secured, the power for the compressor can be reduced. As a result, power saving or downsizing of the compressor can be achieved.

Further, since the dehumidifying efficiency of the introduced outside air is improved and the latent heat of the introduced outside air can be reduced, the load for controlling the temperature of the introduced outside air can be reduced. Furthermore, since outside air can be introduced, an increase in the concentration of carbon dioxide in the vehicle compartment can be suppressed.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating an example of air conditioning control according to the present invention.

FIG. 3 is a characteristic diagram showing a relationship between a target blowing temperature Xm and a voltage Vf supplied to a blower.

[Description of Signs] 1 Vehicle air conditioner 2 Outside air introduction impeller 3 Inside air introduction impeller 4 Motor 5 Blower 6 Air conditioning duct 8 Compressor 9 Condenser 10 Subcondenser 11 Expansion valve 12 Refrigeration cycle 13 Evaporator 14 Heater core 22 Outside air introduction duct 22a Upstream introduction duct 22b Downstream introduction duct 24 Inside air exhaust duct 24a Upstream exhaust duct 24b Downstream exhaust duct 25 Sensible heat exchanger 26 Dehumidifying rotor 27 First door 28 Second door

Claims (3)

[Claims] 1. An air blower comprising one motor and an outside air introduction impeller and an inside air introduction impeller driven by the motor. The suction air blowing means is provided on the blowout side of the outside air introduction impeller and the inside air introduction impeller. An air conditioning duct having a plurality of air outlets opening into the vehicle interior and a mode door selectively opening the air outlets; and an air conditioning duct disposed in the air conditioning duct, and constituting a refrigeration cycle together with at least a compressor, a condenser and expansion means. An evaporator,
A heater core that heats the passing air, an outside air introduction duct that communicates an outside air introduction port that opens outside the vehicle and an intake port of the outside air introduction impeller, and an opening near the outlet side of the inside air introduction impeller of the air conditioning duct. An inside air discharge duct that communicates an opening with an inside air discharge port that opens outside the vehicle, and a dehumidifying rotor that exchanges humidity between introduced outside air passing through the outside air introduction duct and discharged inside air passing through the inside air discharge duct. A sub-condenser is provided between the condenser of the refrigeration cycle and the expansion means, and the sub-condenser is arranged in the inside air discharge duct on the upstream side of the dehumidification rotor. Vehicle air conditioners. 2. A heat exchanger for exchanging heat between introduced outside air passing through the outside air introduction duct and discharged inside air passing through the inside air discharge duct.
An air conditioner for a vehicle as described in the above. 3. A first door for opening and closing the outside air introduction duct, a second door for opening and closing the inside air discharge duct, target temperature setting means for setting a target temperature in the passenger compartment, and detecting a temperature in the passenger compartment. The temperature difference between the vehicle interior temperature detected by the vehicle interior temperature detection means and the target temperature setting means is equal to or greater than a predetermined value. Closed, the rapid cooling means for setting the rotation speed of the motor to a maximum, and when the temperature difference between the vehicle interior temperature and the target temperature in the vehicle interior is smaller than a predetermined value, the first and second 3. A normal cooling means for opening a door, arbitrarily setting the number of rotations of a motor, and operating the dehumidification rotor.
An air conditioner for a vehicle as described in the above.