JPH0732871A - Air conditioner - Google Patents

Abstract

PURPOSE:To automate switching of a dehumidifying time operation mode by controlling so that the operation mode can be switched between a dehumidifying mode and a cooling or heating mode according to data containing at least one of an outside air temperature and a target blowoff temperature. CONSTITUTION:Respective detecting signals of respective sensors 77 to 79 of an inside air temperature, an outside air temperature and solar radiation and a heat sensitivity setting unit 82 as a control target are read in an ECU 68 through an A/D converter 72. This ECU 68 controls the whole air-conditioning operation by practicing a prescribed control program, and controls so that an operation mode can be switched between respective modes of high temperature dehumidification, low temperature dehumidification, cooling and heating according to a switching condition on the basis of the outside air temperature and a target blowoff temperature when a front defroster switch is turned on. Thereby, opertability is improved, and the operation mode can be switched automatically in the proper timing, so that amenity can be maintained excellently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having an improved operation control system during dehumidification.

[0002]

2. Description of the Related Art In recent years, for example, an air conditioner installed in an electric vehicle uses a refrigeration cycle that also serves as a heat pump, and switches a circulation path of a refrigerant to switch an operation mode among a cooling mode, a heating mode, and a dehumidifying mode. It is like this.

[0003]

In the above-mentioned conventional structure, when dehumidifying the interior of the vehicle is necessary, for example, when the windshield of the automobile becomes cloudy, the driver turns on the defroster switch (dehumidifying switch) to operate the vehicle. Mode D
It will be switched to the EF mode (dehumidification mode),
The operation in the DEF mode (dehumidification mode) is continued as it is unless the defroster switch (dehumidification switch) is returned to the off position. Therefore, the driver turns off the defroster switch (dehumidifying switch) when the windshield is cloudy, switches to the cooling or heating mode, and then when the windshield starts to cloud again,
It is necessary for the driver to turn on the defroster switch (dehumidification switch) again and switch to the DEF mode (dehumidification mode) again, which is very troublesome.

Dehumidification may be required not only during the rainy season but also during the winter, but the required dehumidifying capacity (the amount of heat absorbed by the evaporator) is different between the dehumidification during the rainy season and the dehumidification during winter. Even during operation in the dehumidification mode, the dehumidification capacity (the amount of heat absorbed by the evaporator) depends on the outside air temperature and the target outlet temperature.
If it can be switched, it is possible to improve comfort during dehumidification. However, allowing the driver to switch the dehumidifying capacity in this way makes the operation more and more troublesome, and goes against the demand for simplification of operation, which is an important technical problem in recent years.

The present invention has been made in consideration of such circumstances, and an object thereof is to be able to automatically switch the operation mode at the time of dehumidification and to achieve both comfort and operability. It is to provide an air conditioner capable of

[0006]

In order to achieve the above object, in an air conditioner according to claim 1 of the present invention, a condenser and an evaporator are arranged in a blower duct, and outdoor heat exchange is performed outside the blower duct. Are installed in the refrigerant circulation circuit, and the operation mode is switched between the dehumidification mode and the cooling mode by switching the valve provided in the refrigerant circulation circuit to switch the refrigerant circulation path. In the one that is switched between the heating mode and the heating mode, the operation mode is dehumidified on the basis of data including at least one of the outside air temperature and the target outlet temperature for detecting the outside air temperature or obtaining the target outlet temperature. The control unit is configured to control so as to switch between the mode and the cooling or heating mode.

In the air conditioner according to a second aspect of the invention, flow path resistance varying means is provided in each of the refrigerant flow path from the condenser to the outdoor heat exchanger and the refrigerant flow path from the outdoor heat exchanger to the evaporator. A low temperature dehumidifying mode in which the outdoor heat exchanger functions as a condenser together with the condenser by switching the flow channel resistances of the respective refrigerant flow channels by the respective flow channel resistance varying means during dehumidification, and the outdoor heat exchanger In which a high temperature dehumidification mode that acts as an evaporator together with the evaporator is switched, including means for detecting an outside air temperature or obtaining a target outlet temperature, and at least one of the outside air temperature and the target outlet temperature. Control for controlling the dehumidification mode to switch between the low temperature dehumidification mode and the high temperature dehumidification mode based on data It is obtained by a structure in which a stage.

[0008]

According to the invention of claim 1, during the air conditioning operation, the outside air temperature is detected or the target blowout temperature is obtained, and the control means is based on the data including at least one of the outside air temperature and the target blowout temperature. The operation mode is switched between the dehumidification mode and the cooling or heating mode. Thereby, the switching between the dehumidifying mode and the cooling or heating mode is automatically performed according to the environment.

According to the second aspect of the present invention, during the air conditioning operation, the outside air temperature is detected or the target outlet temperature is obtained,
The control means switches the dehumidification operation between the low temperature dehumidification mode and the high temperature dehumidification mode based on the data including at least one of the outside air temperature and the target blowout temperature. in this case,
In low temperature dehumidification mode, while switching the flow path resistance in the refrigerant flow path from the condenser to the outdoor heat exchanger to "small",
The flow path resistance in the refrigerant flow path from the outdoor heat exchanger to the evaporator is switched to "large". As a result, the outdoor heat exchanger functions as a condenser together with the condenser, the refrigerant liquefied by both the condenser and the outdoor heat exchanger is supplied to the evaporator, and the air is dehumidified and cooled by the heat absorbing effect of the evaporator, and then the condenser is cooled. Then, reheat to a slightly lower temperature, and perform dehumidifying heating at a low temperature.

On the contrary, in the high temperature dehumidification mode, the flow path resistance in the refrigerant flow path from the condenser to the outdoor heat exchanger is switched to "large" and the refrigerant flow path from the outdoor heat exchanger to the evaporator is changed. Switch the flow path resistance of to "small". As a result, the outdoor heat exchanger functions as an evaporator together with the evaporator, and after dehumidifying and cooling the air by the heat absorbing effect of the evaporator, the condenser is reheated to a higher temperature to perform dehumidifying and heating at high temperature.

An embodiment in which the present invention is applied to an air conditioner for an electric vehicle will be described with reference to the drawings. First, the schematic configuration of the entire air conditioner will be described with reference to FIG. On the upstream side of the blower case 21, there are provided an outside air suction port 22 for sucking air (outside air) outside the vehicle compartment and two inside air suction ports 23, 24 for sucking air (inside air) inside the vehicle compartment. At the intermediate portion between the inside air intake port 23 and the outside air intake port 22,
The inside / outside air damper 25 is provided, and the opening degree of the inside / outside air damper 25 is adjusted by the servo motor 26.
The intake air temperature is adjusted by changing the mixing ratio of the air taken in from the outside air intake port 22 and the inside air intake ports 23 and 24. The downstream side of the inside / outside air damper 25 and the inside air suction port 2
Blowers 27 and 28 are provided on the downstream side of 4, respectively, and both blowers 27 and 28 are attached to the rotary shaft of a blower motor 29. This blower motor 29 is
It is driven by the drive circuit 30.

On the other hand, an evaporator 31 is arranged on the downstream side of the blowers 27, 28, and the downstream side of the evaporator 31 is partitioned by a partition plate 32 into two upper and lower ventilation passages 33, 34. A condenser 35 is arranged in the lower ventilation passage 34, and an upper portion of the condenser 35 is projected into the upper ventilation passage 33. This capacitor 35
A strong cooling damper 36 is disposed above the, and by driving the strong cooling damper 36 by a servo motor 37,
The air volume that bypasses the condenser 35 is variable. Further, the partition plate 32 on the downstream side of the condenser 35
A communication damper 38 is disposed in the communication port 32a provided in the drive unit 32. By driving the communication damper 38 by a servomotor 39, the amount of air passing through the communication port 32a of the partition plate 32 can be changed to a single mode. (For example, "FACE"
Mode, "DEF" mode, etc.).

A DEF outlet 40 and a FACE outlet 41 are provided on the downstream side of the upper ventilation passage 33. The FACE outlet 41 and the DEF outlet 40 are provided with dampers 48 and 49, respectively.
49 is driven by servomotors 50 and 51. On the other hand, on the downstream side of the lower ventilation passage 34,
A FOOT outlet 52 that blows the wind toward the feet of the occupant is provided, and the FOOT outlet 52 is also provided with a damper 54 that is driven by a servo motor 53.

On the other hand, the evaporator 31 and the condenser 35 described above are components of the refrigeration cycle 55 which also serves as a heat pump. This refrigeration cycle 55 includes a compressor 56, a four-way switching valve 57, an outdoor heat exchanger 58, check valves 59 and 60, a capillary 61, solenoid valves 62 and 63,
64, the pressure reducing valve 65, the accumulator 90, the evaporator 31, and the condenser 35 are connected by piping. Further, in this embodiment, the pressure reducing valve 65 and the capillary 6 are
1 and solenoid valves 63, 6 connected in parallel to them
4, the flow path resistance varying means 92 and 93 are configured.
The electromagnetic valves 62, 63, 64 and the four-way switching valve 57 are switched as shown in Table 1 below according to the operation mode of the refrigeration cycle 55.

[0015]

[Table 1]

As is clear from Table 1, in the cooling mode, the four-way switching valve 57 is switched to the position (on position) shown by the dotted line in FIG.
The refrigerant discharged from a is a check valve 59 → the outdoor heat exchanger 5
8 → Capillary 61 → Evaporator 31 → Accumulator 90 → Suction port 56b of the compressor 56. As a result, the discharge port 56a of the compressor 56
The high temperature gas refrigerant discharged from the heat exchanger 58 dissipates heat and liquefies in the outdoor heat exchanger 58, and the liquid refrigerant evaporates in the evaporator 31 to cool the wind passing through the evaporator 31.

On the other hand, in the heating mode, the four-way switching valve 57 is switched to the position (off position) shown by the solid line in FIG.
The refrigerant discharged from the discharge port 56a of the compressor 56 circulates in the path of the condenser 35, the pressure reducing valve 65, the check valve 60, the outdoor heat exchanger 58, the solenoid valve 62, the accumulator 90, and the suction port 56b of the compressor 56. As a result, the high temperature gas refrigerant discharged from the discharge port 56a of the compressor 56 radiates heat and liquefies in the condenser 35, and the heat radiation warms the wind passing through the condenser 35.

In the defrosting mode, the four-way switching valve 57 is at the position shown by the solid line in FIG. 2, the solenoid valve 63 is opened, and the high temperature gas refrigerant discharged from the discharge port 56a of the compressor 56 is discharged from the condenser 35 and the solenoid valve. It is also supplied to the outdoor heat exchanger 58 via 63 to remove the frost adhering to the surface of the outdoor heat exchanger 58.

Further, in the high temperature dehumidifying mode, the four-way switching valve 5
7, the solenoid valve 63 is closed and the solenoid valve 64 is opened. As a result, the flow path of the refrigerant is changed from the condenser 35 to the pressure reducing valve 65 to the outdoor heat exchanger 58 to
Solenoid valve 64 → evaporator 31 and condenser 35
The flow path resistance in the refrigerant flow path from the outdoor heat exchanger 58 to the outdoor heat exchanger 58 is switched to “large”, and the flow path resistance in the refrigerant flow path from the outdoor heat exchanger 58 to the evaporator 31 is “small”.
Can be switched to. As a result, the outdoor heat exchanger 58 acts as an evaporator together with the evaporator 31 to reduce the inflow amount of the liquid refrigerant into the evaporator 31 and relatively reduce the heat absorption amount of the evaporator 31, and at the same time, the condenser 35 Increase the amount of heat radiated by to perform dehumidifying heating at high temperature.

On the other hand, in the low temperature dehumidification mode, the four-way switching valve 5
At the position 7 shown by the solid line in FIG. 2, the solenoid valve 63 is opened and the solenoid valve 64 is closed. As a result, the refrigerant flow path is changed from the condenser 35 to the solenoid valve 63 to the outdoor heat exchanger 58 to
From the capillary 61 to the evaporator 31, the flow path resistance in the refrigerant flow path from the condenser 35 to the outdoor heat exchanger 58 is switched to “small”, and the outdoor heat exchanger 58 is also provided.
The flow path resistance in the refrigerant flow path from the evaporator to the evaporator 31 is switched to “large”. As a result, the outdoor heat exchanger 5
8 acts as a condenser together with the condenser 35 and supplies the refrigerant liquefied by both the condenser 35 and the outdoor heat exchanger 58 to the evaporator 31 to increase the inflow amount of the liquid refrigerant to the evaporator 31. At the same time that the amount of heat absorbed by the condenser 35 is increased, the amount of heat dissipated in the condenser 35 is relatively reduced, and dehumidifying heating at a low temperature is performed.

The outdoor heat exchanger 58 is provided with an outdoor fan 89 for forced cooling, and the fan motor 89a of the outdoor fan 89 has a refrigeration cycle 5 as shown in FIG.
High-speed rotation “Hi”, low-speed rotation “Lo”, stop “OF” according to the operation mode of 5 and output data of various sensors described later.
For example, in the cooling mode, the outside air temperature Tam detected by the outside air temperature sensor 78 becomes “Hi” at 25 ° C. or higher and becomes “Lo” at 22 ° C. or lower. In heating mode, outside temperature Tam
Becomes "Hi" below 13 ℃, and "Lo" above 16 ℃
Becomes In the high temperature dehumidification mode, the wind temperature immediately after passing through the evaporator 31 (hereinafter referred to as “evaporator outlet temperature”) T
Stops "OFF" when e is 4 ℃ or higher, and becomes "H" when 2 ℃ or lower.
i ”and becomes“ Lo ”in the range of 3 ° C. → 4 ° C. and 3 ° C. → 2 ° C.
Becomes In the low temperature dehumidification mode, the refrigerant discharge pressure Pd of the compressor 56 and the refrigerant discharge temperature Td of the compressor 56 detected by the refrigerant discharge pressure sensor 88
It is determined by the priority order of Hi>Lo> OFF. For example,
If the refrigerant discharge pressure Pd is 19 kgf / cm @ 2 G or more, it will always be "Hi" regardless of the value of Td.

On the other hand, the compressor 5 of the refrigeration cycle 55
The rotation speed of the motor 66 that drives 6 is controlled by an inverter 67. The inverter 67, the servo motors 26, 37, 39, 50, 51, 53, the fan motor 89a of the outdoor fan 89, and the drive circuit 30 of the blower motor 29 are controlled by an electronic control unit (hereinafter referred to as "ECU") 68. The ECU 68 is mainly composed of a microcomputer, and has a CPU 6
9. RAM 70 for temporarily storing various data, FIG.
ROM storing control programs and the like, A / D converter 72 for converting input data into digital values, I
An / O unit 73, a crystal oscillator 74 that generates a reference signal of several MHz, and the like are provided, and power is supplied from a battery 75 via an ignition switch 76.

The ECU 68 detects an inside air temperature sensor 77 for detecting the inside air temperature Tr, an outside air temperature sensor 78 for detecting the outside air temperature Tam, a solar radiation sensor 79 for detecting the amount of solar radiation Ts entering the passenger compartment, and an evaporator outlet temperature Te. Air temperature immediately after passing through the evaporator outlet temperature sensor 80 and the condenser 35 (hereinafter referred to as "condenser outlet temperature") T
A condenser outlet temperature sensor 81 that detects c, a refrigerant discharge pressure sensor 88 that detects the refrigerant discharge pressure Pd of the compressor 56, a temperature sensation setter 82 for an occupant to manually set a set temperature sensation Sset that is a control target, and an evaporator 31. Each detection signal from the intake air temperature sensor 46 that detects the temperature (hereinafter referred to as “intake air temperature”) Tin of the air sucked into the air, the discharge temperature sensor 91 that detects the refrigerant discharge temperature Td, etc., via the A / D converter 72. Read.

The warmth setting device 82 described above is provided with the cool key 8
The air conditioner control panel 83 is provided in the center of an instrument panel (not shown) of the automobile and includes a warming key 2a and a warming key 82b. As shown in FIG. 3, the air conditioner control panel 83 has
Above the temperature sensation setter 82, a temperature sensation display section 84 in which a plurality of light emitting elements 84n are arranged in a horizontal row is provided. The warmth display section 84 displays the set warmth Sset inputted by the cool key 82a and the warm key 82b. This set temperature sensation Sset is an index indicating how cool or warm the temperature is based on the average temperature of 25 ° C. [see FIG. 5 (a)], and before operating the keys 82 a and 82 b. In the state, the light emitting element 84 in the center of the warmth display portion 84
Each time n is turned on and the cool key 82a is pressed once, the set temperature sensation Sset is lowered by one rank to shift the lighting position to the left one by one, and each time the warm key 82b is pressed, the set temperature is set. The feeling Sset is increased by one rank and the lighting position is shifted to the right one by one. In addition, the air conditioner control panel 83 is provided with an air conditioner on / off switch 85, a rear defogger switch 86, and a front defroster switch 87.

On the other hand, the ECU 68 controls the entire air conditioning operation by executing the control program shown in FIG. 1, and when the front defroster switch 87 is turned on, the ECU 68 is based on the outside air temperature Tam and the target outlet temperature TAO. It functions as control means for controlling the operation mode to be switched between the high temperature dehumidification mode, the low temperature dehumidification mode, the cooling mode, and the heating mode according to the switching condition of FIG.
The switching conditions in FIG. 8 are the outside air temperature Tam and the target outlet temperature TAO.
71 of the ECU 68 as a function or data map of
Remembered in.

The control contents of the ECU 68 will be described below with reference to the flowchart of FIG. First, step 10
At 0, the initialization process for initializing the counters and flags used for the subsequent calculation process is executed, and then the process proceeds to step 110, where the set temperature sensation Sset input by the operation of the temperature sensation setter 82 is read and , Inside air temperature sensor 77, outside air temperature sensor 78, solar radiation sensor 79, evaporator outlet temperature sensor 80, condenser outlet temperature sensor 81, intake air temperature sensor 46, outside air temperature Tam, outside air temperature Tam, solar radiation amount Ts, evaporator outlet temperature Te,
Each data of the condenser outlet temperature Tc and the intake air temperature Tin is read.

Next, at step 120, the set temperature Tset is calculated from the set temperature sensation Sset, the outside air temperature Tam and the solar radiation amount Ts by the following equation (1). Tset = f (Sset, Tam, Ts) = Tset '+ [Delta] Tam + [Delta] Ts (1) where Tset' = 25 + 0.4Sset ... See FIG. 5 (a) [Delta] Tam = (10-Tam) / 20 ... FIG. See b) ΔTs = -Ts / 1000 ...... See Fig. 5 (c)

After the set temperature Tset is calculated as described above, the routine proceeds to step 130, where the set temperature Tset is set in the passenger compartment.
The heat quantity QAO required to maintain the set value is calculated by the following equation (2). QAO = K1 * Tset-K2 * Tr-K3 * Tam-K4 * Ts + C (2) (K1, K2, K3, K4: coefficient, C: constant) The required heat quantity QAO was calculated by this equation (2). After that, the process proceeds to step 140, and the front defroster switch 87
Whether or not there is an ON operation (hereinafter referred to as "DEF input") is determined. If there is no DEF input, the routine proceeds to step 150, where the air volume VB is obtained from the air volume characteristics with respect to the required heat volume QAO shown in FIG. 6, and this air volume VB is set as the blowout air volume VAO. Next, at step 160, the target outlet temperature TAO is calculated by the following equation (3).

TAO = QAO / (Cp.gamma.VAO) + Tin (3) where Cp is the specific heat of air, γ is the specific gravity of air, and Tin is the temperature of the intake air sucked into the evaporator 31.

Then, in step 170, the inside air inlet 2
The opening degree of the inside / outside air damper 25 is calculated so as to reduce the temperature difference between the temperature (intake air temperature) Tin of the air sucked through the outside air intake ports 3 and 24 and the outlet temperature TAO. Then
In step 180, it is determined whether the operation mode of the refrigeration cycle 55 is the cooling or heating mode by the following equation (4).

TM = TAO-Tin (4) When TM obtained by the equation (4) is TM ≥ + θ (eg, θ = 2 ° C), the heating mode is set, and TM ≤
When −θ, the cooling mode is set. When −θ <TM <+ θ, the compressor 56 of the refrigeration cycle 55 is stopped.

After the operation mode of the refrigeration cycle 55 is determined in this way, the routine proceeds to step 190, where each of the dampers 36, 38, and 38, based on the blowout temperature TAO and the blown air volume VAO.
The opening degree of 46, 48, 49, 54 is determined, and the blowing mode is set to "FACE", "B / L", "FOOT", "FOOT".
/ DEF "or" DEF ".

The various control data determined as described above are output to each device (step 200), and thereafter, the process returns to step 110 described above and the processing is repeated to control the air conditioning operation. At this time, in order to realize the blown air volume VAO obtained in step 150, the blower motor 29 is used.
The blower voltage applied to is determined by the voltage characteristics of FIG. 7 according to the blowing mode.

In this case, the compressor 56 of the refrigeration cycle 55 is stopped when the blowout temperature TAO required to maintain the vehicle interior at the set temperature Tset can be created by mixing the inside air and the outside air. On the other hand, when the required blow-out temperature TAO cannot be produced only by the inside / outside air, the compressor 67 is driven by the inverter 67, and the refrigeration cycle 55 is operated in the operation mode determined in step 160. At this time, in the cooling mode, feedback control is performed by PI control or fuzzy control for the evaporator outlet temperature Te detected by the evaporator outlet temperature sensor 80, and in the heating mode, the condenser outlet temperature sensor 81 detects the condenser. P for the outlet temperature Tc
Feedback control is performed by I control or fuzzy control.

On the other hand, in step 140 described above, DEF
If it is determined that there is an input, the routine proceeds to step 210, where the blown air volume VAO is set to, for example, 300 m3 / h. Next, in step 220, the opening degree of the inside / outside air damper 25 is determined to be the outside air mode, and in step 230, the target blowout temperature TAO is calculated by the above-described equation (3).

Next, at step 240, the operation mode is determined based on the target outlet air temperature TAO and the outside air temperature Tam under the switching condition of FIG. The switching condition of FIG. 8 is stored in the ROM 71 of the ECU 68 as a function or a data map of the outside air temperature Tam and the target outlet temperature TAO. If the region of the target outlet temperature TAO and the outside air temperature Tam obtained in step 230 described above is the H region of FIG. 8, the heating mode, DH
A high temperature dehumidification mode is determined for a region, a low temperature dehumidification mode is determined for a DC region, and a cooling mode is determined for a C'or C region (C 'region is a mode for strengthening / weakening cooling). Generally, in the cooling mode, the low temperature dehumidifying mode and the high temperature dehumidifying mode, the evaporator outlet temperature Te is lower than the intake air temperature Tin by about 10 ° C. or more, and Te> 0 ° C., so that the evaporator 31 is not frozen. In addition to being able to dehumidify, the blowout temperature can be brought sufficiently close to the target blowout temperature TAO.

On the other hand, in the heating mode, dehumidification is not performed, but since the blow-out temperature can be made sufficiently high with respect to the intake air temperature Tin, the relative humidity of the blown-air decreases, and the defroster performance equivalent to that of dehumidifying is obtained. Further, the blowout temperature can be sufficiently brought close to the target blowout temperature TAO.

After the operation mode is determined as described above, step 2
After proceeding to 50 and determining the blowout mode to be "DEF",
In step 200, the control data is output to each device, and thereafter, the process returns to step 110 and the process is repeated. In this case, even when DEF is input, in the cooling mode,
The evaporator outlet temperature Te detected by the evaporator outlet temperature sensor 80 is subjected to feedback control by PI control or fuzzy control, and low temperature dehumidification,
In each of the high temperature dehumidification and heating modes, feedback control is performed by PI control or fuzzy control for the condenser outlet temperature Tc detected by the condenser outlet temperature sensor 81. In the C'region (cooling strong / weak mode),
Temperature difference Δ between intake air temperature Tin and evaporator outlet temperature Te
A container 56 in which T is a set temperature (for example, 15 ° C)
The operation of hunting between the rotation speed of 1 and the minimum rotation speed of the compressor 56 is repeated.

According to the present embodiment described above, when the DEF input is present, the operation mode is set to the high temperature dehumidification mode, the low temperature dehumidification mode, and the cooling mode according to the switching conditions shown in FIG. 8 based on the outside air temperature Tam and the target outlet temperature TAO. Since the mode is switched between the heating mode and the heating mode, if the front defroster switch 87 is turned on only once when dehumidification is necessary, then the operation mode is automatically changed according to the outside air temperature Tam and the target outlet temperature TAO. It is possible to switch to, and both comfort and operability can be achieved.

Moreover, since the dehumidification mode is automatically switched between the high temperature dehumidification mode and the low temperature dehumidification mode according to the outside air temperature Tam and the target outlet temperature TAO, the dehumidification mode is changed to the high temperature according to the environmental conditions. It can be automatically switched between low temperature and the outlet temperature sufficiently close to the target outlet temperature TAO, and the comfort during dehumidification can be made extremely high.

In this embodiment, the automatic switching of the operation mode when the DEF input is present has been described. However, when the dehumidifying switch or the auto air conditioner switch is turned on instead of the DEF input, the operation as in this embodiment is performed. The mode may be automatically switched.

In this embodiment, the operation mode is switched based on both the outside air temperature Tam and the target outlet air temperature TAO. However, the operation mode is switched based on the data including one of the outside air temperature Tam and the target outlet air temperature TAO. You may make it switch a driving mode. Further, in the present embodiment, all four modes of the high temperature dehumidification mode, the low temperature dehumidification mode, the cooling mode (including the cooling strong / weak mode) and the heating mode can be automatically switched. It is possible to automatically switch only between the low temperature dehumidification mode and the cooling mode, or to automatically switch only between the high temperature dehumidification mode and the low temperature dehumidification mode. You can

Further, in this embodiment, in step 210, the blown air volume VAO is set to a constant value (for example, 300 m3 / h).
However, the blowing air volume VAO may be varied according to the required heat quantity QAO and the like. Also, step 220
The opening degree of the inside / outside air damper 25, which is determined by, may be variable instead of being fixed in the outside air mode.

In addition, the present invention is not limited to an air conditioner for an electric vehicle, and may be applied to various air conditioners such as an air conditioner for an engine-driven automobile and an air conditioner for a house. It goes without saying that various modifications can be made without departing from the scope.

[0045]

As is apparent from the above description, according to the first aspect of the invention, the operation modes are dehumidifying mode and cooling or heating mode based on the data including at least one of the outside air temperature and the target outlet temperature. Since it automatically switches between operation modes, it greatly saves time and effort for switching operation modes, improves operability, and automatically switches operation modes at appropriate times, which is comfortable. The property can also be maintained satisfactorily.

Further, according to the second aspect of the invention, the dehumidification mode is automatically switched between the high temperature dehumidification mode and the low temperature dehumidification mode based on the data including at least one of the outside air temperature and the target blowout temperature. As a result, the dehumidification mode can be automatically switched between high temperature and low temperature depending on the environmental conditions, and the outlet temperature can be brought sufficiently close to the target outlet temperature, and the comfort during dehumidification is extremely high. be able to.

[Brief description of drawings]

FIG. 1 is a flowchart of a control program showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of the entire air conditioner.

[Figure 3] Front view of the air conditioner control panel

FIG. 4 is a diagram showing a relationship between a refrigeration cycle operation mode and an outdoor fan operation mode.

5A is a diagram showing a relationship between a set temperature sensation Sset and Tset ', FIG. 5B is a diagram showing a relationship between outside air temperature Tam and ΔTam, and FIG. 5C is a relationship between solar radiation amount Ts and ΔTs. Showing

FIG. 6 is a diagram showing the relationship between the required heat quantity QAO and the air volume VB.

FIG. 7 is a diagram showing the relationship between the blown air volume VAO and the blower voltage.

FIG. 8 is a diagram showing a relationship between an outlet temperature TAO, an outside air temperature Tam, and an operation mode.

[Explanation of symbols]

22 ... Outside air inlet, 23, 24 ... Inside air inlet, 25 ... Inside / outside air damper, 31 ... Evaporator, 35 ... Condenser,
40 ... DEF air outlet, 41 ... FACE air outlet, 46 ... Intake air temperature sensor, 52 ... FOOT air outlet, 55 ... Refrigeration cycle, 56 ... Compressor, 57 ... Four-way switching valve, 58 ...
Outdoor heat exchanger, 61 ... Capillary, 62-64 ... Electromagnetic valve, 65 ... Pressure reducing valve, 67 ... Inverter, 68 ... ECU
(Control means), 77 ... Inside air temperature sensor, 78 ... Outside air temperature sensor, 79 ... Solar radiation sensor, 80 ... Evaporator outlet temperature sensor, 81 ... Condenser outlet temperature sensor, 82 ... Warm feeling setting device, 82a ... Cooling key, 82b. ... warm key,
Reference numeral 84 ... Warm feeling display portion, 88 ... Refrigerant pressure sensor, 89 ... Outdoor fan, 92, 93 ... Flow path resistance varying means.

Claims (2)

[Claims] 1. A condenser and an evaporator are arranged in a blower duct, an outdoor heat exchanger is arranged outside the blower duct, and these condenser, evaporator and outdoor heat exchanger are provided in a refrigerant circulation circuit. In an air conditioner in which the operation mode is switched between the dehumidifying mode and the cooling or heating mode by switching the valve provided in the circulation circuit to switch the refrigerant circulation path, the outside air temperature is detected or the target outlet temperature is set. And a control unit that controls the operation mode to switch between the dehumidification mode and the cooling or heating mode based on data including at least one of the outside air temperature and the target outlet temperature. Air conditioner characterized by. 2. A condenser and an evaporator are arranged in the blower duct, an outdoor heat exchanger is arranged outside the blower duct, and the condenser, the evaporator and the outdoor heat exchanger are provided in a refrigerant circulation circuit, and the condenser is formed. To the outdoor heat exchanger and a refrigerant flow path from the outdoor heat exchanger to the evaporator are provided with flow path resistance varying means, and at the time of dehumidification, the flow path resistance varying means causes the flow rate of each refrigerant to flow. By switching the flow path resistance of the passage, between the low temperature dehumidification mode in which the outdoor heat exchanger acts as a condenser together with the condenser, and the high temperature dehumidification mode in which the outdoor heat exchanger acts as an evaporator together with the evaporator. In the air conditioner that is switched, means for detecting the outside air temperature or obtaining a target outlet temperature, and Degrees and air conditioning system, characterized in that the dehumidification mode on the basis of the data and control means for controlling to switch between the low-temperature dehumidification mode and the high-temperature dehumidifying mode including at least one of the target air temperature.