JP2009248587A - Air conditioning device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effeciently heat the interior of a compartment with preventing a window from fogging. <P>SOLUTION: An evaporator 18 includes: an upper stage 18A corresponding to a flow passage 68; and a lower stage 18B corresponding to a flow passage 70, both of which are integrally formed, and further includes: a sensing tube 76 arranged between the upper stage and the lower stage; and an sensing tube 78 installed on a refrigerant discharging side of the lower stage. The sensing tubes 76 and 78 are connected to an expansion valve 16 through a sensing tube changing-over valve 80. When the air conditioning device 10 is set to an outdoor air/indoor air double layer mode for introducing outdoor air into the flow passage 68 and indoor air into the flow passage 70, the expansion valve and the sensing tube 76 are made to communicated with each other through the sensing tube changing-over valve, and the zone downstream of the vicinity of the refrigerant discharging port at the upper stage becomes SH96B to prevent the indoor air from being cooled by a heater core. Thus, deterioration of heating efficiency is avoided when the window is prevented from fogging. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner that is provided in a vehicle that is driven by driving of an internal combustion engine or an electric motor and that air-conditions a vehicle interior.

  In an air conditioner (hereinafter referred to as an “air conditioner”) provided in a vehicle, inside air or outside air is introduced, the air is cooled using a refrigeration cycle when passing through an evaporator, and heating means such as a heater core ( Hereinafter, the air-conditioning air generated by adjusting the temperature by performing heating when passing through the “heater core” is blown into the vehicle interior.

  In an air conditioner, a comfortable feeling of heating is obtained by blowing out air-conditioning air, which is temperature-controlled mainly by heating with a heater core, from a foot outlet or the like. At this time, the heating efficiency is improved by performing the air conditioning operation in the inside air circulation mode in which the air in the passenger compartment is introduced.

  By the way, when the vehicle interior is heated in the inside air circulation mode, the humidity in the vehicle interior becomes high and the wind glass is likely to be fogged. In the air conditioner, the DEF mode and the FOOT / DEF mode are set in order to remove fogging and prevent fogging (hereinafter referred to as anti-fogging) of the window glass. For example, when the air conditioner is set to the DEF mode, the outside air is introduced, and the conditioned air generated by further dehumidifying the introduced outside air by the refrigeration cycle is blown out toward the wind glass.

  On the other hand, when heating the passenger compartment in the FOOT / DEF mode while preventing defogging, it is necessary to heat the outside air, which is low in temperature and cooled by passing through the evaporator, by the heater core. For this reason, it is difficult to efficiently heat the air, and in a hybrid vehicle or a vehicle in which idle stop control is performed, a sufficient heating capacity is not secured even though the heating operation is performed. This can cause discomfort such as a lack of heating.

  From here, in order to ensure anti-fogging properties and heating capacity, the outside air can be guided to the defroster outlet through the evaporator, and the inside air can be guided to the foot outlet through the heater core. An inside / outside air two-layer air conditioner provided with a flow path of conditioned air is used.

  As such an air conditioner, a heat exchanger that performs heat exchange between the refrigerant circulated in the refrigeration cycle and air is provided in each of the flow paths of the two conditioned air, and air using two heat exchangers is provided. It has been proposed that the air can be cooled or heated using only one heat exchanger (see, for example, Patent Document 1).

  Moreover, the heat exchanger which formed integrally the 1st heat exchange part arrange | positioned at one of two flow paths, and the 2nd heat exchange part arrange | positioned at the other, and the 1st heat exchange part and the 2nd heat exchange part Vehicle that enables dehumidification while preventing shortage in heating capacity by providing a switching valve between them and using the first heat exchange part as a condenser and the second heat exchange part as a radiator An air conditioner for a vehicle has been proposed (for example, see Patent Document 2).

However, in such an inside / outside air two-layer air conditioner, it is necessary to switch the flow path of the refrigerant according to the operation mode, and the configuration of the refrigeration cycle and the like becomes complicated.
JP-A-10-67224 Japanese Patent Laid-Open No. 2002-264641

  The present invention has been made in view of the above-described facts, and an object of the present invention is to provide a vehicle air conditioner that enables efficient heating while preventing fogging with a simple configuration.

  In order to achieve the above object, the present invention includes a cooling means for cooling or dehumidifying the air passing through the evaporator by a refrigeration cycle, and a heating means for heating the air, and is produced by cooling or heating the introduced air. This is a vehicle air conditioner that blows air from the outside air into the passenger compartment and allows the outside air introduced from the outside air inlet or the inside air introduced from the inside air inlet to be guided to the defroster outlet through the evaporator. The outside air is introduced into the first passage, the second passage capable of guiding the outside air or the inside air to the foot outlet through the evaporator and the heating means, and the first passage. When the inside / outside air two-layer mode in which the inside air is introduced into the second channel is selected, the inside air introduced into the second channel is cooled by the evaporator. Avoidance means for avoiding the of the, characterized in that it comprises a.

  According to the present invention, when the inside / outside air two-layer mode in which outside air that is outside the vehicle is introduced into the first flow path and air inside the vehicle is introduced into the second flow path is selected, It avoids being cooled by the cooling means and is guided to the heating means.

  Thereby, it is possible to avoid cooling the inside air before being heated by the heating means by the cooling means.

  Therefore, it is possible to prevent the heating efficiency from deteriorating while allowing the wind glass to reliably remove and prevent fogging by the outside air.

  In the invention according to claim 2, the evaporator is fed with the first cooling section corresponding to the first flow path and the refrigerant that has passed through the first cooling section corresponding to the second flow path. When the second cooling unit is provided, the avoidance unit controls the refrigerant flow rate to the evaporator based on the refrigerant temperature that has passed through the first cooling unit; When the second flow rate adjusting means for controlling the refrigerant flow rate to the evaporator based on the temperature of the refrigerant that has passed through the second cooling section and the inside / outside air two-layer mode are selected, the first flow rate adjusting means Switching means for switching to control the flow rate of the refrigerant to the evaporator.

  In general, in an air conditioner, by controlling the flow rate of refrigerant sent to an evaporator based on the refrigerant temperature on the discharge side of the evaporator, the refrigerant discharged from the evaporator becomes a gas region having a superheat degree (superheat). Therefore, efficient cooling is possible on the entire surface of the evaporator.

  In the invention of claim 2, when the evaporator is provided with the first cooling unit and the second cooling unit, and the refrigerant that has passed through the first cooling unit is sent to the second cooling unit, normally The flow rate of the refrigerant sent to the evaporator is adjusted by the second flow rate adjusting means. When the inside / outside air two-layer mode is selected, the refrigerant flow rate is adjusted by the first flow rate adjusting means.

  Thereby, when the inside / outside air two-layer mode is selected, the inside air introduced into the second flow path is prevented from being cooled by the evaporator. Therefore, it is possible to efficiently heat the inside air while preventing the wind glass from being fogged.

  In the present invention as described above, at least one of the first or second flow rate adjusting means is connected to the sensitive cylinder in which the internal pressure changes based on the refrigerant temperature, and the sensitive cylinder. And a flow rate adjusting valve in which the flow rate of the refrigerant is changed in accordance with the change in the internal pressure. In the present invention, at least one of the first or second flow rate adjusting means is detected by a temperature detecting means for detecting a refrigerant temperature, an actuator for controlling the refrigerant flow rate, and the temperature detecting means. Control means for controlling the operation of the actuator based on the refrigerant temperature.

  Further, according to the present invention, one of the first or second flow rate adjusting means is connected to a sensitive cylinder in which an internal pressure changes based on a refrigerant temperature, and a change in the internal pressure of the sensitive cylinder is communicated with the sensitive cylinder. A flow rate adjusting valve that changes a refrigerant flow rate according to the temperature detection means for detecting the refrigerant temperature, an actuator for controlling the refrigerant flow rate, and the refrigerant temperature detected by the temperature detection means. And control means for controlling the operation of the actuator based on the above.

  The invention according to claim 5 is characterized in that the avoiding means is bypass means that allows the inside air introduced into the second flow path to be guided to the heating means by bypassing the cooling means. To do.

  According to the present invention, the second flow path is provided with the bypass means for bypassing the evaporator so that when the inside / outside air two-layer mode is selected, the inside air is guided to the heating means by bypassing the evaporator. .

  Thereby, since it is possible to avoid cooling the inside air heated by the heating means with the evaporator, the inside air can be efficiently heated by the heating means.

  As described above, according to the present invention, when the inside / outside air two-layer mode in which outside air is introduced into the first passage and inside air is introduced into the second passage is selected, the second passage Since the avoidance means for avoiding cooling of the inside air introduced by the evaporator is provided, an excellent effect that the inside air can be efficiently heated is obtained.

  Further, the present invention is based on the refrigerant temperature that has passed through the first cooling unit or the refrigerant temperature that has passed through the second cooling unit when using an evaporator formed by the first cooling unit and the second cooling unit. With the simple configuration for controlling the refrigerant flow rate, when the inside / outside air two-layer mode is selected, it is possible to prevent the inside air heating efficiency from deteriorating while anti-fogging the window glass.

  Further, according to the present invention, it is possible to prevent the heating efficiency of the inside air from being lowered while preventing the fogging of the window glass when the inside / outside air two-layer mode is selected with a simple configuration in which the bypass means is provided. .

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
1 and 2 show a schematic configuration of a vehicle air conditioner (hereinafter referred to as “air conditioner 10”) according to the first embodiment. The vehicle provided with the air conditioner 10 may be a conventional vehicle driven by an internal combustion engine (engine), a hybrid vehicle driven by an engine and an electric motor, an electric vehicle driven by an electric motor, or the like. Although it can be applied to a vehicle having an arbitrary configuration, a vehicle equipped with an engine (a conventional vehicle or a hybrid vehicle) will be described below as an example.

  As shown in FIG. 2, in the air conditioner 10, a refrigeration cycle including a compressor (compressor 12), a condenser (condenser 14), an expansion valve (expansion valve 16), and a radiator (evaporator 18) is formed. .

  In this refrigeration cycle, the refrigerant compressed by rotating the compressor 12 is sent to the condenser 14. In the condenser 14, air on the vehicle front side is introduced by driving the vehicle or driving a cooling fan (not shown), whereby heat is exchanged between the air and the refrigerant to cool the refrigerant. Thus, the liquefied refrigerant is sent to the evaporator 18. In the evaporator 18, the liquefied refrigerant is vaporized, whereby heat exchange is performed with the air passing through the evaporator 18, and the air passing through the evaporator 18 is cooled or dehumidified.

  The expansion valve 16 is configured to improve the vaporization efficiency of the refrigerant in the evaporator 18 (cooling efficiency in the evaporator 18) by sending the refrigerant 18 in a mist state by rapidly depressurizing the refrigerant. A known general configuration can be applied to the basic configuration of such a refrigeration cycle.

  As shown in FIG. 1, the air conditioner 10 includes an air conditioner unit 20 in which a flow path of conditioned air is formed, and a blower unit 22 that introduces air used to generate the conditioned air.

  The blower unit 22 is open toward the outside of the vehicle and can be introduced outside air (outside air) 24 and can be introduced into the inside of the vehicle interior. The inside air inlet 26 is formed, and the outside air inlet 24 and the switching door 28 for opening and closing the inside air inlet 26 are provided. The blower unit 22 is provided with a blower fan 30. Thus, in the air conditioner 10, when the blower fan 30 is driven to rotate by driving the blower motor 32, outside air or inside air is introduced into the blower unit 22 and sent into the air conditioner unit 20.

  The air conditioner unit 20 is provided with an evaporator 18, and air sent from the blower unit 22 passes through the evaporator 18. At this time, when the compressor 12 is operated, in the air conditioner 10, heat exchange is performed between the air passing through the evaporator 18 and the refrigerant, thereby cooling and dehumidifying the air passing through the evaporator 18.

  The air conditioner 10 is seated on the front seat and the rear seat as a defroster outlet 34 that opens toward a wind glass (not shown), a register outlet 36 that opens toward an occupant in the passenger compartment, and an air outlet for air conditioning. A foot outlet 38 that is open toward the feet of the occupant is provided.

  The air conditioner unit 20 is connected to a defroster outlet 34, a register outlet 36, and a foot outlet 38. Further, the air conditioner unit 20 is provided with a mode switching door 40 (mode switching doors 40A, 40B, 40C, 40D) for selectively opening and closing the defroster outlet 34, the register outlet 36, and the foot outlet 38.

  In the air conditioner 10, the DEF mode in which the defroster outlet 34 is selected, the FACE mode in which the register outlet 36 is selected, the FOOT mode in which the foot outlet 38 is selected, the register outlet 36 and the foot as the air-conditioning air blowing mode. A BI-LEVEL mode in which the outlet 38 is selected and a FOOT / DEF mode in which the defroster outlet 34 and the foot outlet 38 are selected are set. In the air conditioner unit 20, the mode switching door 40 is operated in accordance with the blowing mode. Thereby, in the air conditioner 10, the conditioned air is blown out from the blowout opening corresponding to the blowout mode.

  The air conditioner unit 20 is provided with a heater core 42 and an air mix door 44. Cooling liquid (for example, cooling water) is circulated between the heater core 42 and an engine (not shown), and thereby air passing through the heater core 42 is heated. The amount of air passing through the heater core 42 is controlled by the air mix door 44.

  In the air conditioner 10, the air bypassed by the heater core 42 by the air mix door 44 and the air heated by passing through the heater core 42 are mixed in the air conditioner unit 20. Thereby, in the air conditioner 40, the air-conditioning wind which makes a vehicle interior a desired temperature according to the opening degree of the air mix door 40 is produced | generated. In addition, as a heating means, you may provide electric heaters, such as a PCT heater, as an auxiliary heating means. Further, when the air conditioner 10 is provided in an electric vehicle, an electric heater or the like can be applied as a heating means instead of the heater core 42.

  On the other hand, as shown in FIG. 2, the air conditioner ECU 50 provided in the control unit 48 that controls the operation of the air conditioner 10 includes a microcomputer in which a CPU, a ROM, a RAM, and the like are connected by a bus, various input / output interfaces, and a drive circuit. (All are not shown in the figure).

  The air conditioner ECU 50 is connected to the compressor 12 and the blower motor 32. The air conditioner 10 is provided with actuators such as an actuator 52A that operates the switching door 28, an actuator 52B that operates the mode switching door 40, and an actuator 52C that operates the air mix door 44. The ECU 50 is connected.

  The air conditioner ECU 50 controls the cooling capacity by controlling the operation (drive / stop, refrigerant discharge pressure, etc.) of the compressor 12. At the same time, the air conditioner ECU 50 controls the blower air volume, which is the air volume of the air conditioned air, by controlling the operation (drive / stop, rotation speed, etc.) of the blower motor 32. The air conditioner ECU 50 controls the switching door 28 by operating the actuator 52A, controls the mode switching door 40 by operating the actuator 52B, and controls the opening of the air mix door 44 by operating the actuator 52C.

  The compressor 12 may be driven by an electric motor (compressor motor). At this time, the air conditioner ECU 50 controls the driving / stopping of the compressor motor, the rotational speed at the time of driving, and the like. That's fine. Further, the compressor 12 may be driven by the driving force of the engine. At this time, the air conditioner ECU 50 has a known general configuration such that the driving force is intermittently controlled and the refrigerant discharge pressure at the time of driving is controlled. Can be applied.

  The air conditioner 10 includes a room temperature sensor 54 that detects a temperature (room temperature) in the vehicle interior, an outside air temperature sensor 56 that detects a temperature outside the vehicle (outside air temperature), a solar radiation sensor 58 that detects the amount of solar radiation, and a cooling water temperature (water temperature). And a post-evaporator temperature sensor 62 for detecting the temperature of the air that has passed through the evaporator 18 (post-evaporator temperature), and the like, are connected to the air conditioner ECU 50.

  The air conditioner ECU 50 detects an environmental condition and an operating state when the vehicle interior is air-conditioned by these sensors, and performs an air conditioning operation so that the vehicle interior becomes a set temperature based on an operation condition input from an operation panel (not shown). I do.

  At this time, the air conditioner ECU 50 sets a target blowing temperature, which is the temperature of the conditioned air for setting the passenger compartment to the set temperature, based on the set temperature, the room temperature, the outside air temperature, the amount of solar radiation, and the like. The heating capacity and the cooling capacity are controlled so that the conditioned air can be obtained. In addition, when the air-conditioning operation in the auto mode is set, the air-conditioner ECU 50 sets the operation conditions such as the blower air volume and the air-conditioning air blowing mode based on the target blowing temperature, and performs the air-conditioning operation under the set operating conditions. Do. In addition, the basic structure of control of the air-conditioning driving | operation of the air conditioner 10 by such air-conditioner ECU50 can apply a well-known general structure, and abbreviate | omits detailed description here.

  By the way, as shown in FIG. 1, in the air conditioner 10, a centrifugal fan is used as an example of the blower fan 30. The blower fan 30 is divided into a first fan 30A and a second fan 30B at an axial intermediate portion. Thereby, in the blower unit 22, the first fan 30A sucks air from the upper side of the drawing in FIG. 1, and the second fan 30B sucks air from the lower side of the drawing. In the following description, the upper side of the sheet of FIG. 1 is the upper side of the air conditioner unit 20 and the blower unit 22, and the lower side of the sheet of FIG. 1 is the lower side. As a result, the blower fan 30 has a first fan 30A on the upper side and a second fan 30B on the lower side.

  The blower unit 22 is provided with a partition wall 64 so as to surround the first fan 30 </ b> A of the blower fan 30. The partition wall 64 is formed to partition the blower unit 22 into an upper side on the first fan 30A side and a lower side on the second fan 30B side.

  The blower unit 22 is formed with an outside air inlet 24 on the upper side. Further, the blower unit 22 is formed with an inside air introduction port 26A on the side of the blower fan 30 and an inside air introduction port 26B adjacent to the outside air introduction port 24 on the upper side of the blower fan 30 as the inside air introduction port 26. As the switching door 28, a switching door 28A for opening / closing the inside air introduction port 26A and a switching door 28B for selectively opening / closing the outside air introduction port 24 and the inside air introduction port 26B are provided.

  The switching door 28 </ b> A partitions the blower unit 22 up and down between the partition wall 64 and the inside air inlet 26 </ b> A being opened. Thereby, in the state where the inside air introduction port 26A is opened, air (outside air or inside air) is introduced from the outside air introduction port 24 or the inside air introduction port 26B by the first fan 30A, and air is introduced from the inside air introduction port 26A by the second fan 30B. (Shy) is introduced. In the state where the inside air introduction port 26A is closed, air (outside air or inside air) is introduced from the outside air introduction port 24 or the inside air introduction port 26B by the first fan 30A and the second fan 30B.

  The air conditioner 10 controls the opening / closing of the outside air introduction port 24 and the inside air introduction port 26 (26A, 26B) by the switching doors 28A, 28B, thereby reducing the inside air introduction rate, which is the ratio of the inside air to the amount of introduced air, to 100. % To 0% (outside air introduction rate from 0% to 100%) can be adjusted stepwise.

  Thereby, in the air conditioner 10, the outside air introduction mode (inside air introduction rate 0%) for introducing only outside air from the outside air introduction port 24 and the inside air circulation mode (inside air introduction rate 100%) for introducing only the inside air from the inside air introduction ports 26A and 26B are set. In addition, an air-conditioning operation in the inside / outside air two-layer mode in which outside air is introduced by the first fan 30A and inside air is introduced by the second fan 30B is possible.

  On the other hand, a separator 66 that partitions the air flow path is provided between the air conditioner unit 20 and the blower unit 22. The separator 66 is provided between the evaporator 18 and the blower fan 30, guides the air introduced by the first fan 30 </ b> A to the upper side of the evaporator 18, and guides the air introduced by the second fan 30 </ b> B. It arrange | positions so that it may guide to the lower part side of 18. FIG.

  A defroster outlet 34 is connected to the air conditioner unit 20 adjacent to the upper side of the evaporator 18, a heater core 42 is disposed adjacent to the lower side of the evaporator 18, and a foot outlet 38 near the heater core 42. Is communicated. The air conditioner unit 20 is provided with an air mix door 44 </ b> A facing the upper side of the evaporator 18 and an air mix door 44 </ b> B facing the lower side of the evaporator 18 as the air mix door 44.

  In the air conditioner 10, when the air mix door 44 </ b> A is closed (for example, a position indicated by a broken line or a two-dot chain line in FIG. 1), the upper side of the evaporator 18 and the defroster outlet 34 can communicate with each other. A flow path 68 is formed as a first flow path through the evaporator 18 to the defroster outlet 34.

  In the air conditioner 10, the air mix door 44 </ b> B is opened (for example, a position indicated by a broken line or a solid line in FIG. 1) to reach the foot outlet 38 from the inside air inlet 26 </ b> A through the lower side of the evaporator 18 and the heater core 42. A flow path 70 serving as a second flow path is formed.

  Thus, in the air conditioner 10, when the inside / outside air two-layer mode and the FOOT / DEF mode are set, the outside air introduced from the outside air introduction port 24 is blown out from the defroster blowing port 34 toward the wind glass via the evaporator 18. The interior air introduced from the interior air inlet 26A is heated by the heater core 42 and blown out from the foot outlet 38 while anti-fogging of the window glass is achieved, so that the vehicle interior can be efficiently heated. Yes.

  In FIG. 1, the fully closed state (Max Cool) of the air mix doors 44A and 44B is indicated by a two-dot chain line, and the fully open state (Max Hot) is indicated by a solid line. In the air conditioner 10, when the inside / outside air two-layer mode is selected, the air mix doors 44 </ b> A and 44 </ b> B are half-opened (indicated by broken lines in FIG. 1). The air can be guided to the outlet 34 and the inside air that has passed through the flow path 70 is guided to the heater core 42.

  On the other hand, as shown in FIG. 1 and FIG. 3A, the evaporator 18 applied to the present embodiment has an upper side (hereinafter referred to as an upper step portion 18A) and a lower side (hereinafter referred to as a lower step portion 18B). It has a two-layer structure divided into two. As shown in FIG. 1, the evaporator 18 has an upper step portion 18 </ b> A disposed on the flow path 68 side and a lower step portion 18 </ b> B disposed on the flow path 70 side.

  Thereby, in the air conditioner 10, when the inside / outside air two-layer mode is selected, outside air introduced from the outside air introduction port 24 passes through the upper stage portion 18A, and inside air introduced from the inside air introduction port 26A passes through the lower stage portion 18B. pass.

  As shown in FIGS. 3 (A) and 3 (B), in the evaporator 18, the refrigerant cooled and liquefied by the condenser 14 is sent to the upper stage portion 18A via the expansion valve 16, and the upper stage portion 18A is passed through the upper stage portion 18A. The refrigerant that has passed is sent to the lower stage portion 18B through the refrigerant pipe 72, and the refrigerant that has passed through the lower stage portion 18B is returned to the compressor 12 through the refrigerant pipe 74.

  In the evaporator 18 applied to the first embodiment, a sensitive cylinder 76 is provided on the refrigerant pipe 72 connecting the upper stage 18A and the lower stage 18B, and a sensitive cylinder 78 is provided on the lower stage 18A side of the refrigerant pipe 74. ing. The internal pressure of the sensitive cylinder 76 changes in accordance with the temperature of the refrigerant in the refrigerant pipe 72, and the internal pressure of the sensitive cylinder 78 changes in accordance with the temperature of the refrigerant in the refrigerant pipe 74.

  The air conditioner 10 is provided with a sensitive cylinder switching valve 80. The sensitive cylinder 76 of the refrigerant pipe 72 is connected to the sensitive cylinder switching valve 80 via a pipe 82A, and the sensitive cylinder 78 of the refrigerant pipe 74 is connected to the sensitive cylinder switching valve 80 via a pipe 82B. The sensitive cylinder switching valve 80 is connected to the expansion valve 16 via a pipe 82C.

  The sensitive cylinder switching valve 80 switches the communication state between the pipe 82A and the pipe 82C or the pipe 82B and the pipe 82C. Thereby, a change in the internal pressure of the sensitive cylinder 76 or the sensitive cylinder 78 is transmitted to the expansion valve 18.

  As shown in FIG. 3B, the expansion valve 16 is a heat-sensitive expansion valve having a general configuration in which a diaphragm 84 is provided. In the expansion valve 16, the needle valve 86 and the diaphragm 84 are connected by a rod 88, and the needle valve 86 is urged in a direction to close the orifice 92 by the urging force of the pressure spring 90.

  In the expansion valve 16, when the pressure on the sensitive cylinder switching valve 80 side increases, the needle valve 86 is pushed down against the urging force of the pressure spring 90 by the diaphragm 84. Thereby, in the expansion valve 16, the orifice 92 is opened and the refrigerant flow rate is increased.

  Further, in the expansion valve 16, when the pressure on the sensitive cylinder switching valve 80 side becomes low, the needle valve 86 is pushed up by the urging force of the pressure spring 90. Thereby, in the expansion valve 16, the orifice 92 is narrowed and the refrigerant | coolant flow volume is restrict | squeezed.

  As shown in FIG. 2, the air conditioner 10 is provided with an actuator 94 that operates the sensitive cylinder switching valve 80, and this actuator 94 is connected to the air conditioner ECU 50. The air conditioner ECU 50 controls the operation of the actuator 94 to switch between the state in which the expansion valve 16 and the sensitive cylinder 76 communicate with each other by the sensitive cylinder switching valve 80 or the state in which the expansion valve 16 and the sensitive cylinder 78 communicate with each other. . Thereby, the expansion valve 16 controls the flow rate of the refrigerant according to the pressure change in the sensitive cylinder 76 or the sensitive cylinder 78.

  The air conditioner ECU 50 switches so that the sensitive cylinder 76 and the diaphragm 84 of the expansion valve 18 communicate with each other when the air introduction mode is the inside / outside air two-layer mode. As a result, in the air conditioner 10, the sensing cylinder 78 and the diaphragm 84 are communicated with each other except in the inside / outside air two-layer mode such as the outside air introduction mode and the inside air circulation mode, and the refrigerant flow rate is controlled according to the internal pressure of the sensing cylinder 76. .

  In the air conditioner 10, when the inside / outside air two-layer mode is selected, the sensitive cylinder 76 and the diaphragm 84 are in communication with each other, and the refrigerant flow rate is controlled based on the internal pressure of the sensitive cylinder 76.

  Here, in a state where the expansion valve 16 and the sensitive cylinder 78 are communicated with each other by the sensitive cylinder switching valve 80, the refrigerant that has passed through the evaporator 18 (lower stage portion 18B) becomes a gas region having a superheat degree (superheat). In addition, the refrigerant flow rate is controlled by the expansion valve 16. As a result, as shown in FIG. 3B, the refrigerant has a superheated gas region (SH96A) from the vicinity of the refrigerant discharge side of the lower stage portion 18B.

  On the other hand, in a state where the expansion valve 16 and the sensitive cylinder 76 are communicated by the sensitive cylinder switching valve 80, the refrigerant by the expansion valve 16 so that the refrigerant that has passed through the upper stage portion 18A becomes a gas region having a superheat degree. The flow rate control is performed. Thereby, the vicinity of the discharge side of the upper stage portion 18A becomes a gas region (SH96B) in which the refrigerant has a superheat degree, and the cooling of the air in the lower stage portion 18B of the evaporator 18 is stopped.

  Therefore, in the air conditioner 10, when the inside / outside air two-layer mode is selected, only the outside air guided along the flow path 68 and passing through the upper stage portion 18 </ b> A of the evaporator 18 is cooled. Thus, the inside air passing through the lower stage portion 18B of the evaporator 18 is sent to the heater core 42 without being cooled.

  The operation of the first embodiment will be described below.

  In the air conditioner 10, when performing an air conditioning operation, based on the heating load, the cooling load, etc., the compressor 12 drive control, the air mix door 44 opening control, the blower air volume control, etc. The air conditioning operation is performed so as to be in a state (for example, a set temperature).

  On the other hand, in the air conditioner 10, when the heating operation is performed, if the heating load is large, the air introduction mode is set to the inside air circulation mode, thereby enabling efficient heating. In the air conditioner 10, for example, when the air mix door 44 is at the maximum opening (Max Hot) and in the FOOT mode or the FOOT / DEF mode, or in addition to this, the vehicle speed is a predetermined value or more. When heating operation is performed under preset conditions, such as when the air conditioner is operating, the introduction mode is set to the inside / outside air two-layer mode, and the outside air with low humidity is introduced while circulating the inside air. Heating capacity is ensured while suppressing cloudiness.

  By the way, in the air-conditioner 10 which becomes the inside / outside air two-layer type, the evaporator 18 is a two-stage type in which the upper step portion 18A and the lower step portion 18B are integrated. In the air conditioner 10, a sensitive cylinder 76 is provided between the upper stage 18A and the lower stage 18B, a sensitive cylinder 78 is provided on the refrigerant discharge side of the lower stage 18B, and the sensitive cylinders 76 and 78 are switched by the sensitive cylinder switching valve 80. Connected to the expansion valve 16.

  Thereby, in the air conditioner 10, it is possible to switch between cooling each of the air passing through the flow paths 68 and 70 or cooling only the air passing through the one flow path 68. While suppressing the decrease, it is possible to prevent an increase in humidity in the vehicle interior and to prevent fogging.

  Here, with reference to FIG. 4, an outline of the introduction mode during the heating operation in the air conditioner ECU 50 and the sensitive cylinder switching control by the sensitive cylinder switching valve 80 will be described. Note that the processing in FIG. 4 is executed when an ignition switch (not shown) is turned on and an instruction to start an air conditioning operation in the auto mode is given, for example. Moreover, this process should just be performed at the time of the heating operation of the air-conditioner 10. FIG.

  In this flowchart, it is confirmed in the first step 200 whether or not the air conditioner 10 is warming up. In the air conditioner 10, for example, when the set temperature is higher than the outside air temperature or the room temperature, the air conditioning operation in the heating mode is set. In the air conditioner 10, when the air conditioning operation is performed in the heating mode, any one of the FOOT mode, the BI-LEVEL mode, and the FOOT / DEF mode is selected as the air-conditioning air blowing mode. Further, when the air conditioner 10 starts the air conditioning operation in the heating mode, the air conditioner 10 warms up when the coolant temperature is low (for example, when the coolant temperature is equal to or lower than a preset minimum coolant temperature). .

  In this warm-up, for example, when the blower fan 30 is stopped and the cooling water temperature rises to a predetermined temperature (for example, the above-mentioned minimum water temperature) by the warm-up operation of the engine, the blower fan 30 is adjusted so as to have a minimum air volume. Rotating drive. Thereafter, in the air conditioner 10, the blower fan 30 is driven so that the blower air volume increases as the coolant temperature rises.

  Then, when the coolant temperature rises to a temperature at which a predetermined heating capacity can be ensured, the warm-up is terminated, and for example, an air conditioning operation (heating operation) is performed with a blower air volume based on the target blowing temperature.

  Here, if the air conditioner ECU 50 is warming up, an affirmative determination is made in step 200 and the routine proceeds to step 202. In this step 202, the air introduction mode is set to the inside / outside air two-layer mode. Thus, in the air conditioner 10, the inside air introduction port 26A is opened by the switching door 28A, the outside air introduction port 24 is opened by the switching door 28B, and the inside air introduction port 26B is closed. At this time, in the air conditioner ECU 50, by setting the air mix door 44 in a half-open state, the flow path 68 from the outside air inlet 24 to the defroster outlet 34 and the inside air inlet 26A to the foot outlet 38 through the heater core 42. A leading flow path 70 is formed.

  In the next step 204, the sensitive cylinder switching valve 80 is operated so that the expansion valve 16 and the sensitive cylinder 76 provided on the discharge side of the upper stage portion 18A of the evaporator 18 communicate with each other.

  In the air conditioner 10, for example, when the temperature of the air that has passed through the evaporator 18 (post-evaporator temperature) exceeds a predetermined temperature (for example, the post-evaporator temperature of the upper stage 18A is 0 ° C.), the air conditioner 10 is set in advance. The compressor 12 is driven under the above conditions, and the air passing through the evaporator 18 is cooled and dehumidified.

  At this time, in the evaporator 18, the expansion tube 16 communicates with the sensitive cylinder 76 provided in the refrigerant pipe 72 between the upper step portion 18 </ b> A and the lower step portion 18 </ b> B. The refrigerant flow rate is controlled based on the refrigerant temperature that has passed.

  Thereby, in the air conditioner 10, cooling and dehumidification of the outside air passing through the upper stage portion 18A of the evaporator 18 are performed. Further, in the evaporator 18, the lower stage portion 18B becomes SH96B (superheated gas region), so in the air conditioner 10, the inside air passing through the lower stage portion 18A is sent to the heater core 42 without being cooled.

  Therefore, even if the compressor 12 is driven, the inside air heated by the heater core 42 is not cooled by the evaporator 18, so the air conditioner 10 efficiently heats the inside air using the heater core 42, and the heated conditioned air The vehicle interior can be heated. When the compressor 12 is stopped, the outside air having a lower humidity than the inside air is blown into the vehicle interior as it is, so that the wind glass using the outside air is removed from fogging, fogging is prevented, and the humidity inside the vehicle is prevented from rising. Is possible.

  Thus, in the air conditioner 10, when the inside / outside air two-layer mode is selected, the inside air is heated by the heater core 42 without being cooled by the evaporator 18, so that the upper stage portion 18 </ b> A of the evaporator 18 is not lowered without reducing the heating capacity. The conditioned air that has passed can surely prevent a rise in humidity in the vehicle interior and fogging of the windshield.

  On the other hand, when the warm-up is completed, the air conditioner ECU 50 makes a negative determination in step 200 and proceeds to step 206. In step 206, the air introduction mode is set to the outside air introduction mode. Thus, in the air conditioner 10, the inside air introduction ports 26 </ b> A and 26 </ b> B are closed by the switching doors 28 </ b> A and 28 </ b> B, and the outside air introduction port 24 is opened to introduce outside air into the blower unit 22.

  Further, the air conditioner ECU 50 operates the sensitive cylinder switching valve 80 in the next step 208 to switch the communication cylinder 78 on the outlet side of the lower stage portion 18A and the diaphragm 84 of the expansion valve 16 to communicate with each other, thereby ending the processing. .

Thereby, in the air conditioner 10, when the compressor 12 operates, the entire area of the evaporator 18 (both the upper stage 18A and the lower stage 18B) can be used to dehumidify the conditioned air. Further, even when the compressor 12 is stopped, the introduction of outside air can suppress the increase in humidity in the vehicle compartment during heating, and reliably prevent fogging of the wind glass.
[Second Embodiment]
Next, a second embodiment of the present invention will be described. The basic configuration of the second embodiment is the same as that of the first embodiment described above, and the same reference numerals are used for the same parts as those of the first embodiment in the second embodiment. Will be omitted.

  FIG. 6A shows a schematic configuration in the vicinity of the evaporator 18 in the air conditioner 10A according to the second embodiment. In the air conditioner 10 </ b> A, an expansion valve 100 is provided instead of the expansion valve 16.

  As shown in FIG. 6B, the expansion valve 100 includes an adjustable screw 102 in which a needle valve 86 and a rod 88 are formed. In the expansion valve 100, an adjustable screw 102 is movable by a diaphragm 84 in a direction in which the needle valve 86 opens the orifice 92 and a closing direction.

  Further, as shown in FIGS. 6A and 6B, the expansion valve 100 is provided with an actuator unit 104 for operating the adjustable screw 102. As shown in FIG. 6B, the actuator unit 104 includes, for example, an actuator 106 such as a stepping motor, a gear unit 108, and the like.

  In the gear unit 108, a flange 112 is formed at the tip of a rod 110 inserted into the expansion valve 100, and a pressure spring 90 is disposed between the flange 112 and the needle valve 86. Thereby, in the expansion valve 100, the needle valve 86 can move in the direction of increasing the refrigerant flow rate and the direction of reducing the refrigerant flow rate due to the pressure difference generated in the diaphragm 84.

  In addition, the actuator unit 104 is configured such that the rod 110 is axially moved by driving the actuator 106. Thereby, in the expansion valve 100, the needle valve 86 can be moved in the direction in which the refrigerant flow rate increases and the refrigerant flow rate is reduced regardless of the pressure difference generated in the diaphragm 84.

  On the other hand, as shown in FIGS. 6A and 6B, in the air conditioner 10A, the refrigerant temperature sensor 114 is provided in the refrigerant pipe 72 between the upper stage part 18A and the lower stage part 18B of the evaporator 18. Yes. In the air conditioner 10A, a sensitive cylinder 78 provided on the refrigerant discharge side of the lower step portion 18B is communicated with the expansion valve 100 via a pipe 82B.

  Thereby, the expansion valve 100 can control the flow rate of the refrigerant by the pressure change in the sensitive cylinder 78 according to the temperature of the refrigerant discharged from the lower stage portion 18B. At this time, the refrigerant flow rate is controlled so that the vicinity of the discharge port of the lower step portion 18A shown in FIG. 6B becomes SH96A.

  As shown in FIG. 5, the actuator 106 of the actuator unit 104 and the refrigerant temperature sensor 114 are connected to the air conditioner ECU 50A provided in the control unit 48A of the air conditioner 10A. As a result, the air conditioner ECU 50A can control the flow rate of the refrigerant sent to the evaporator 18 and detect the temperature of the refrigerant that has passed through the upper stage portion 18A of the evaporator 18 by driving the actuator 106.

  In the air conditioner ECU 50A, even during the heating operation, the adjustable screw 102 is held so as to be in a preset original position in the outside air introduction mode and the inside air circulation mode. At this time, the expansion valve 100 performs refrigerant flow rate control in the expansion valve 100 in accordance with the pressure change in the sensitive cylinder 78.

  In addition, air conditioning ECU 50A controls actuator 106 based on the refrigerant temperature detected by refrigerant temperature sensor 114 when the inside / outside air two-layer mode is set during heating operation. At this time, the air conditioner ECU 50A operates the actuator 106 so that the refrigerant flow rate after the discharge port of the upper portion 18A of the evaporator 18 becomes a gas region SH96B (see FIG. 6B) having a superheat degree is obtained. .

  Such control is performed, for example, when the refrigerant temperature detected by the refrigerant temperature sensor 114 is low, the actuator 106 is operated so as to reduce the flow rate of the refrigerant, and the change in the refrigerant temperature detected by the refrigerant temperature sensor 114 is eliminated. It is possible to apply a configuration such as

  In the air conditioner 10A configured as described above, when the inside / outside air two-layer mode is selected, the outside air can be cooled by the evaporator 18 and guided to the defroster outlet 34, and the inside air that has not been cooled by the evaporator 18 can be guided. Guide to the heater core 42 is possible.

  Here, as an operation of the second embodiment, an example of control in the air conditioner ECU 50A will be described with reference to FIG. This flowchart is similar to FIG. 4 described above. In the first step 200, it is confirmed whether or not the air conditioner 10A is warming up. If it is warming up, an affirmative determination is made in step 200 and the process proceeds to step 202. The air introduction mode is set to the inside / outside air two-layer mode.

  Thereafter, in step 210, the refrigerant flow rate control in the expansion valve 100 is performed by operating the actuator 106 based on the refrigerant temperature detected by the refrigerant temperature sensor 114.

  Thereby, in the air conditioner 10A, the outside air introduced from the outside air introduction port 24 can be blown out from the defroster blowing port 34 toward the window glass. Further, when the compressor 12 is driven, cooling and dehumidification are performed when the outside air passes through the upper stage portion 18A of the evaporator 18. Therefore, reliable anti-fogging of the window glass is possible.

  Further, in the air conditioner 10A, the inside air introduced from the inside air introduction port 26A is heated by the heater core 42 without being cooled even if it passes through the lower stage portion 18B of the evaporator 18. Thereby, in the air conditioner 10A, the heating efficiency is not lowered, and the conditioned air can be efficiently heated.

  On the other hand, if the warm-up has been completed, a negative determination is made in step 200 and the process proceeds to step 206. In step 206, the air introduction mode is set to the outside air introduction mode, and in step 212, the operation of the needle valve 86 by the actuator 106 of the expansion valve 100 is terminated. That is, the actuator 106 is operated so that the flange 112 in the expansion valve 100 is returned to the original position and held.

  Thus, in the air conditioner 10A, the refrigerant flow rate is controlled by the expansion valve 100 so that substantially the entire area of the evaporator 18 (approximately the entire area of the upper stage portion 18A and the lower stage portion 18B) is in the saturated vapor state of the refrigerant.

In the second embodiment, the temperature of the refrigerant discharged from the upper stage portion 18A is detected by the refrigerant temperature sensor 114, and the sensitive cylinder 78 is provided in the vicinity of the refrigerant discharge port of the lower stage portion 18B. Alternatively, a sensitive cylinder 76 may be provided on the refrigerant discharge side of the upper stage portion 18A, the refrigerant temperature discharged from the lower stage portion 18B may be detected by a refrigerant temperature sensor, and the refrigerant flow rate to the evaporator 18 may be controlled. .
[Third Embodiment]
Next, a third embodiment of the present invention will be described. The basic configuration of the third embodiment is the same as that of the second embodiment described above. In the third embodiment, the same components as those of the first or second embodiment are used. The same reference numerals are given and the description thereof is omitted.

  FIG. 9A shows a schematic configuration in the vicinity of the evaporator 18 in the air conditioner 10B according to the third embodiment. The air conditioner 10B is provided with an expansion valve 120.

  As shown in FIG. 9B, the expansion valve 120 includes an adjustable screw 122. The adjustable screw 122 is formed including a needle valve 86 and a rod 88, and the needle valve 86 is urged by a pressure spring 90 in a direction to close the orifice 92.

  As shown in FIGS. 9A and 9B, the expansion valve 120 is provided with an actuator unit 104. As shown in FIG. 9B, in the expansion valve 120, the rod 88 is connected to the gear box 108 of the actuator unit 104. As a result, in the expansion valve 120, the actuator 106 is driven to move the needle valve 86 in a direction to close and open the orifice 92.

  On the other hand, as shown in FIGS. 9A and 9B, in the air conditioner 10B, the refrigerant temperature sensor 114 is provided in the refrigerant pipe 72 between the upper stage portion 18A and the lower stage portion 18B of the evaporator 18. In the air conditioner 10B, a refrigerant temperature sensor 124 that detects the temperature of the refrigerant discharged from the lower stage portion 18B is provided on the refrigerant outlet side of the lower stage portion 18B.

  As shown in FIG. 8, the refrigerant temperature sensor 124 is connected to the air conditioner ECU 50 </ b> B provided in the control unit 48 </ b> B of the air conditioner 10 </ b> B together with the refrigerant temperature sensor 114. Thus, the air conditioner ECU 50B can detect the refrigerant temperature discharged from the upper stage portion 18A and the refrigerant temperature discharged from the lower stage portion 18B.

  The air conditioner ECU 50B is connected to the actuator 106 of the actuator unit 104. In the air conditioner ECU 50B, the refrigerant flow rate using the expansion valve 120 is determined based on the refrigerant temperature detected by the refrigerant temperature sensor 114 or the refrigerant temperature sensor 124. Take control.

  Here, in the air conditioner ECU 50B, when the inside / outside air two-layer mode is selected during the heating operation, the actuator 106 is operated based on the refrigerant temperature detected by the refrigerant temperature sensor 114 provided between the upper stage portion 18A and the lower stage portion 18B. Operate. At this time, in the air conditioner ECU 50B, the refrigerant flow rate is controlled so that the entire region of the upper stage portion 18A is in a saturated vapor state of the refrigerant. Thereby, the evaporator 18 is made to become the gas area HS96B having a superheat degree from the vicinity of the discharge port side of the upper stage portion 18A shown in FIG. 9B.

  Further, in the air conditioner ECU 50B, even during the heating operation, when the outside air introduction mode or the inside air circulation mode is selected, the refrigerant temperature detected by the refrigerant temperature sensor 124 provided on the refrigerant discharge side of the lower stage portion 18B is set. Based on this, the actuator 106 is operated. At this time, the air conditioner ECU 50B controls the refrigerant flow rate so that substantially the entire area of the evaporator 18 (approximately the entire area of the upper stage portion 18A and the lower stage portion 18B) is in the saturated vapor state of the refrigerant. Thereby, the evaporator 18 is made to become the gas area 96A with a superheat degree from the discharge port vicinity of the lower step part 18B shown by FIG. 9 (B).

  In the air conditioner 10B configured as described above, similarly to the air conditioners 10 and 10A described above, when the inside / outside air two-layer mode is selected, the outside air can be cooled by the evaporator 18 and guided to the defroster outlet 34. The inside air that is not cooled by the evaporator 18 can be guided to the heater core 42.

  Here, as an operation of the third embodiment, an example of control in the air conditioner ECU 50B will be described with reference to FIG. In this flowchart, as in FIG. 4 and FIG. 7, in the first step 200, it is confirmed whether or not the air conditioner 10A is warming up. The air introduction mode is set to the inside / outside air two-layer mode.

  Thereafter, in step 220, the refrigerant flow rate control at the expansion valve 120 is performed by operating the actuator 106 based on the refrigerant temperature discharged from the upper portion 18 </ b> A of the evaporator 18 using the refrigerant temperature sensor 114.

  Thereby, also in the air conditioner 10B, similarly to the air conditioners 10 and 10A, the outside air introduced from the outside air introduction port 24 can be blown out from the defroster blowing port 34 toward the window glass. In the air conditioner 10B as well, when the compressor 12 is being driven, the outside air is cooled and dehumidified as it passes through the upper portion 18A of the evaporator 18. Therefore, reliable anti-fogging of the window glass is possible.

  In the air conditioner 10 </ b> B, the inside air introduced from the inside air introduction port 26 </ b> A is heated by the heater core 42 without being cooled even if it passes through the lower stage portion 18 </ b> B of the evaporator 18. Thereby, in the air conditioner 10B, heating efficiency is not reduced, and efficient heating of the conditioned air is possible.

  On the other hand, if the warm-up has been completed, a negative determination is made in step 200 and the process proceeds to step 206. In step 206, the air introduction mode is set to the outside air introduction mode, and in step 222, the refrigerant temperature used as a reference when controlling the actuator 106 of the expansion valve 120 is the refrigerant discharged from the lower end portion 18 </ b> B of the evaporator 18. Switch to temperature. That is, the refrigerant flow rate control at the expansion valve 120 is performed by operating the actuator 106 based on the refrigerant temperature discharged from the lower stage portion 18B of the evaporator 18 using the refrigerant temperature sensor 124.

As a result, in the air conditioner 10B, the refrigerant flow rate is controlled by the expansion valve 100 so that substantially the entire area of the evaporator 18 (approximately the entire area of the upper stage portion 18A and the lower stage portion 18B) is in the saturated vapor state of the refrigerant.
[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described. The basic configuration of the fourth embodiment is the same as that of the first embodiment described above, and the same reference numerals are used for the same parts as those of the first embodiment in the fourth embodiment. Will be omitted.

  FIG. 11 shows a schematic configuration of an air conditioner 10C according to the fourth embodiment. The air conditioner 10 </ b> C is configured by connecting an air conditioner unit 20 </ b> A to a blower unit 22.

  The air conditioner unit 20 </ b> A is provided with an evaporator 130 having a general configuration that is not divided into upper and lower parts, instead of the evaporator 18. The evaporator 130 is provided with a sensitive cylinder on the refrigerant discharge side, and this sensitive cylinder (not shown) communicates with the expansion valve 16 (see FIG. 11), and the flow rate based on the refrigerant temperature discharged from the evaporator 130. Control is to be made.

  The evaporator 130 is arranged so as to be offset from the upper side of the air conditioner unit 20A. Thereby, in the air conditioner unit 20 </ b> A, an air passage that can bypass the evaporator 130 is formed on the lower side of the evaporator 130.

The air conditioner unit 20 </ b> A is provided with a flow path switching door 132 so as to face the evaporator 130 below the spacer 66. This flow path switching door 132 is provided on the blower unit 22 side of the evaporator 130.
The flow path switching door 132 bypasses the evaporator 130 at a position for guiding the air introduced by the second fan 30B so as to pass through the evaporator 130 (shown by a solid line in FIG. 11, hereinafter referred to as a fully opened position). The position to be guided (shown by a two-dot chain line in FIG. 11, hereinafter referred to as a fully closed position) can be taken.

  Thereby, in the air conditioner 10C, when the flow path switching door 132 is in the fully open position, the flow path 70A is formed in which the air introduced by the second fan 30B is guided to the heater core 42 without passing through the evaporator 130. Is done.

  As shown in FIG. 12, an actuator 134 for operating the flow path switching door 132 is connected to the air conditioner ECU 50C of the control unit 48C provided in the air conditioner 10C. The air conditioner ECU 50C controls the operation of the actuator 134 to open and close the flow path switching door 132.

  In the air conditioner ECU 50C, when the air introduction mode is set to a mode other than the inside / outside air two-layer mode such as the inside air circulation mode or the outside air introduction mode, the flow path switching door 132 is set to the fully closed position. Further, when the inside / outside air two-layer mode is selected, the air conditioner ECU 50C operates the actuator 134 to fully open the flow path switching door 132. Thereby, in the air conditioner 10C, when the inside / outside air two-layer mode is selected, the inside air introduced from the inside air introduction port 26A bypasses the evaporator 130 and is guided to the heater core 42.

  Here, as an operation of the fourth embodiment, an example of control in the air conditioner ECU 50C will be described with reference to FIG. In this flowchart, as in FIGS. 4, 7, and 10 described above, in the first step 200, it is confirmed whether or not the air conditioner 10 </ b> A is warming up. Then, the process proceeds to step 202, where the air introduction mode is set to the inside / outside air double layer mode.

  Thereafter, in step 230, the flow path switching door 132 is fully opened by operating the actuator 134. Thereby, in the air conditioner 10C, the outside air introduced from the outside air introduction port 24 can be blown out from the defroster blowing port 34 toward the window glass. Further, in the air conditioner 10C, when the compressor 12 is driven, cooling and dehumidification are performed when the outside air passes through the evaporator 130. Therefore, in the air conditioner 10C, the window glass can be reliably prevented from being fogged.

  In the air conditioner 10 </ b> C, the inside air introduced from the inside air introduction port 26 </ b> A is guided to the heater core 42 by bypassing the evaporator 130 by the flow path switching door 132. Thereby, since the inside air introduced from the inside air introduction port 26A is heated by the heater core 42 without being cooled by the evaporator 130, the heating efficiency is not lowered. Therefore, the air conditioning air can be efficiently heated also in the air conditioner 10C.

  On the other hand, if the warm-up has been completed, a negative determination is made in step 200 and the process proceeds to step 206. In step 206, the air introduction mode is set to the outside air introduction mode. At the same time, in step 232, the flow path switching door 132 is fully closed by operating the actuator 134.

  Thereby, in the air conditioner 10C, when the compressor 12 is driven, it is possible to generate conditioned air cooled or dehumidified by the evaporator 130.

  In the first to fourth embodiments, the inside / outside air two-layer mode is selected during the warm-up. However, the present invention is not limited to this, and the inside / outside air two-layer mode is selected during the normal heating operation. It is also possible to control so that only the outside air is cooled by the evaporator and the inside air is not cooled by the evaporator and is heated by the heater core 42.

  Further, in the first to fourth embodiments, when the warm-up is completed, the mode is switched to the outside air introduction mode. However, the mode is not limited to the outside air introduction mode, and the mode is switched to the inside air circulation mode, The mode may be continued. At this time, if the inside / outside air two-layer mode is selected, cooling of the inside air is avoided, and outside the inside / outside air two-layer mode, the outside air and the inside air may be cooled by the evaporators 18 and 130.

  The first and fourth embodiments described above do not limit the configuration of the avoidance means to which the present invention is applied. The avoidance means of the present invention is used when the inside / outside air two-layer mode is selected. In addition, any configuration can be applied as long as the configuration substantially avoids cooling of the inside air introduced into the second flow path.

1 is a schematic configuration diagram of an air conditioner according to a first embodiment. It is the schematic which shows the control part of the air conditioner which concerns on 1st Embodiment. (A) is a schematic block diagram near the evaporator which concerns on 1st Embodiment, (B) is a schematic block diagram of control of the refrigerant | coolant flow volume which concerns on 1st Embodiment. It is a flowchart which shows the outline of switching of the introduction mode in 1st Embodiment, and control of a refrigerant | coolant flow rate. It is the schematic which shows the control part of the air conditioner which concerns on 2nd Embodiment. (A) is a schematic block diagram of the vicinity of the evaporator which concerns on 2nd Embodiment, (B) is a schematic block diagram of control of the refrigerant | coolant flow volume which concerns on 2nd Embodiment. It is a flowchart which shows the outline of control of introduction mode switching and refrigerant | coolant flow volume in 2nd Embodiment. It is the schematic which shows the control part of the air conditioner which concerns on 3rd Embodiment. (A) is a schematic block diagram of the vicinity of the evaporator which concerns on 3rd Embodiment, (B) is a schematic block diagram of control of the refrigerant | coolant flow volume which concerns on 3rd Embodiment. It is a flowchart which shows the outline of switching of the introduction mode in 3rd Embodiment, and control of a refrigerant | coolant flow rate. It is a schematic block diagram of the air conditioner which concerns on 4th Embodiment. It is the schematic which shows the control part of the air conditioner which concerns on 4th Embodiment. It is a flowchart which shows the outline of control of introduction mode switching and refrigerant | coolant flow volume in 4th Embodiment.

Explanation of symbols

10, 10A-10C air conditioner (vehicle air conditioner)
12 Compressor (cooling means)
16 Expansion valve (first and second adjusting means, flow rate adjusting valve)
18 Evaporator 18A Upper part (first cooling part)
18B Lower part (second cooling part)
24 Outside air inlet 26 (26A, 26B) Inside air inlet 30 Blower fan 30A First fan 30B Second fan 34 Defroster outlet 38 Foot outlet 42 Heater core (heating means)
44 (44A, 44B) Air mix door 50, 50A-50C Air conditioner ECU (switching means, control means)
68 channel (first channel)
70, 70A channel (second channel)
76 Sensitive cylinder (avoidance means, first flow rate adjustment means)
78 Sensitive cylinder (avoidance means, second flow rate adjustment means)
80 Sensitive cylinder switching valve (switching means)
100 expansion valve (first and second flow rate adjusting means, flow rate adjusting valve, flow rate control means)
106 Actuator (Flow control means)
114 Refrigerant temperature sensor (avoidance means, first flow rate adjustment means, temperature detection means)
120 expansion valve (first and second flow rate adjusting means, flow rate adjusting valve, flow rate control means)
124 refrigerant temperature sensor (avoidance means, second flow rate adjustment means, temperature detection means)
130 evaporator 132 flow path switching door (avoidance means, bypass means)

Claims (5)

A cooling means for cooling or dehumidifying the air passing through the evaporator by a refrigeration cycle, and a heating means for heating the air, and air-conditioning air generated by cooling or heating the introduced air is blown into the passenger compartment for air conditioning. A vehicle air conditioner,
A first flow path capable of guiding outside air introduced from the outside air introduction port or inside air introduced from the inside air introduction port to the defroster outlet through the evaporator;
A second flow path capable of guiding the outside air or the inside air to the foot outlet through the evaporator and the heating means;
When the inside / outside air two-layer mode in which the outside air is introduced into the first channel and the inside air is introduced into the second channel is selected, the inside air introduced into the second channel is Avoidance means for avoiding cooling by the evaporator;
The vehicle air conditioner characterized by including. The evaporator includes a first cooling section corresponding to the first flow path, and a second cooling section corresponding to the second flow path and into which the refrigerant that has passed through the first cooling section is sent. When
The avoiding means is
First flow rate adjusting means for controlling the flow rate of refrigerant to the evaporator based on the temperature of the refrigerant that has passed through the first cooling unit;
Second flow rate adjusting means for controlling the flow rate of refrigerant to the evaporator based on the temperature of the refrigerant that has passed through the second cooling unit;
Switching means for controlling the refrigerant flow rate to the evaporator by switching to the first flow rate adjustment means when the inside / outside air two-layer mode is selected;
The vehicle air conditioner according to claim 1, comprising: At least one of the first or second flow rate adjusting means is a sensitive cylinder whose internal pressure changes based on the refrigerant temperature;
The vehicle air conditioner according to claim 2, further comprising: a flow rate adjusting valve that communicates with the sensitive cylinder and changes a refrigerant flow rate according to a change in an internal pressure of the sensitive cylinder. At least one of the first or second flow rate adjusting means is a temperature detecting means for detecting a refrigerant temperature;
An actuator for controlling the refrigerant flow rate;
Control means for controlling the operation of the actuator based on the refrigerant temperature detected by the temperature detection means;
The vehicle air conditioner according to claim 2 or 3, characterized by comprising:   2. The vehicle according to claim 1, wherein the avoiding unit is a bypass unit that can guide the inside air introduced into the second flow path to the heating unit by bypassing the cooling unit. Air conditioner.

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