JP2019182134A - Vehicular air conditioner - Google Patents

Abstract

To provide a vehicular air conditioner capable of increasing humidity of air blown out to an upper body of an occupant and reducing a temperature of the air blown out to the upper body of the occupant.SOLUTION: An vehicular air conditioner 1 includes an air-conditioning case 10 in which an inside air ventilation passage 10b having inside air flowing therein and an outside air ventilation passage 10a having outside air flowing therein are formed. The vehicular air conditioner 1 includes: a face blowout passage 80 for blowing out the outside air that has been caused to flow in the outside air ventilation passage 10a toward an upper body of an occupant; and a foot blowout passage 8c1 for blowing out the inside air that has been caused to flow in the inside air ventilation passage 10b toward a lower body of the occupant. The vehicular air conditioner 1 includes: a bypass passage 10c branched from the outside air ventilation passage 10a at an upstream side of a heater core 6 and merged with the face blowout passage 80; and a bypass door 15 for switching between a communication state and a shutoff state of the bypass passage 10c. The vehicular air conditioner 1 includes a humidifier 9 for humidifying air flowing in the face blowout passage 80.SELECTED DRAWING: Figure 1

Description

  The disclosure in this specification relates to a vehicle air conditioner of a two-layered inside / outside air type.

  Patent Document 1 discloses a so-called inside / outside air two-layer vehicle air conditioner in which an outside air ventilation path and an inside air ventilation path are formed in an air conditioning case. The vehicle air conditioner is provided with a bypass passage that causes a part of the inside air flowing through the inside air ventilation path to bypass the cooling heat exchanger and the heating heat exchanger and blow out to the upper body of the passenger.

JP 2014-237352 A

  In a vehicle air conditioner during heating, it is desirable that the humidity of the air blown to the upper body of the occupant is high, and the temperature of the air blown to the upper body of the occupant is lower than the air blown to the feet. Is desirable. In the prior art, since the inside air which is in a relatively high temperature state is blown out to the upper body of the occupant by heating, there is room for improvement in terms of temperature reduction.

  The disclosed object is to provide a vehicle air conditioner capable of increasing the humidity of air blown to the upper body of an occupant and lowering the temperature of air blown to the upper body of the occupant.

  A plurality of aspects disclosed in this specification adopt different technical means to achieve each purpose. In addition, the reference numerals in the parentheses described in the claims and in this section are examples showing the correspondence with the specific means described in the embodiments described later as one aspect, and limit the technical scope. is not.

  One of the disclosed vehicle air conditioners includes an air conditioning case (10) in which an inside air ventilation path (10b) through which the inside air circulates and an outside air ventilation path (10a) through which the outside air circulates, and the inside air is blown into the inside air ventilation path. And an air blower (3) for blowing the outside air to the outside air ventilation path, and a cooling heat exchanger (4) that is housed in the air conditioning case and cools the inside air that flows through the inside air ventilation path and the outside air that flows through the outside air ventilation path. ), A heating heat exchanger (6) that is disposed downstream of the cooling heat exchanger and that circulates the inside air and the outside air that flows through the outside air passage, and the outside air that circulates through the outside air passage In the upper air passage (80; 85) for blowing the air toward the upper body of the occupant, the foot air passage (8c1) for blowing the internal air circulated through the internal air ventilation passage toward the lower body of the occupant, and upstream of the heat exchanger for heating From outside air vent The bypass passage (10c) that joins the upper blowing passage, the switching portion (15) that switches between the communication state and the blocking state of the bypass passage, and the humidifying device (9) that humidifies the blown air flowing through the upper blowing passage And comprising.

  According to this disclosure, a part of the outside air flowing through the outside air passage can be made to flow through the bypass passage upstream of the heat exchanger for heating and merge with the upper outlet passage. For this reason, at the time of heating, the temperature of the air which blows off from an upper blowing channel | path by comparatively low temperature external air can be reduced. In addition, the air flowing into the upper outlet passage is humidified by the humidifier. As a result, the humidity of the air blown to the upper body of the occupant can be increased. As described above, it is possible to provide a vehicle air conditioner that can increase the humidity of the air blown to the upper body of the occupant and can reduce the temperature of the air blown to the upper body of the occupant.

It is a figure which shows the vehicle air conditioner which concerns on 1st Embodiment. It is a block diagram which shows the structure of the vehicle air conditioner of 1st Embodiment. It is a flowchart which shows control of the vehicle air conditioner of 1st Embodiment. It is a flowchart which shows control of the vehicle air conditioner of 1st Embodiment. It is a flowchart which shows control of the vehicle air conditioner of 2nd Embodiment. It is a figure which shows the vehicle air conditioner which concerns on 3rd Embodiment. It is a figure which shows the vehicle air conditioner which concerns on 4th Embodiment.

(First embodiment)
The vehicle air conditioner 1 of 1st Embodiment is demonstrated referring FIGS. 1-4. The vehicle air conditioner 1 includes a blower unit that takes in air and blows air, and an air conditioning unit that adjusts the temperature of the air blown by the blower unit. The blower unit and the air conditioning unit are mounted between the instrument panel and the dash panel, for example, in front of the vehicle. The vehicle air conditioner 1 includes an air conditioning case 10 that forms a blower unit and an outer shell of the air conditioning unit.

  The air conditioning case 10 is made of, for example, a resin material such as polypropylene having a certain degree of elasticity and excellent strength. The air conditioning case 10 is formed, for example, by combining and combining a plurality of divided bodies. The air conditioning case 10 includes an inside / outside air switching door 2, a blower 3, an evaporator 4, an air mix door 5, a heater core 6, and a plurality of outlet doors 7a to 7c. The air conditioning case 10 provides a plurality of air passages through which air supplied into the vehicle compartment flows.

  The blower unit includes an inside / outside air switching door 2 and a blower 3. The blower unit takes in air from the inside air intake port 11 and the outside air intake port 12 formed in the air conditioning case 10 and blows air to the air conditioning unit. The inside air intake port 11 takes in the inside air that is the cabin air. The outside air intake 12 takes in outside air that is outside the vehicle. The inside / outside air switching door 2 adjusts the intake ratio between the inside air taken in from the inside air inlet 11 and the outside air taken in from the outside air inlet 12.

  The blower 3 includes a motor 33 that rotationally drives the inside air side fan 32, the outside air side fan 31, and the two fans 31 and 32. The inside air side fan 32 blows the inside air taken in from the inside air intake port 11. The outside air fan 31 blows the outside air taken in from the outside air inlet 12. The inside air side fan 32 and the outside air side fan 31 are installed so as to overlap in the vertical direction, and are connected to the motor 33 by a common rotating shaft.

  The air conditioning unit includes an air conditioning case 10, an evaporator 4 accommodated in the air conditioning case 10, an air mix door 5, a heater core 6, and a plurality of outlet doors 7 a to 7 b. The air conditioning case 10 provides ventilation paths 10a and 10b through which air blown from the blower unit circulates. The ventilation paths 10a and 10b are divided into an outside air ventilation path 10a through which outside air flows and an inside air ventilation path 10b through which inside air circulates by a partition plate 13 provided in the air conditioning case 10. The partition plate 13 partitions the inside of the air conditioning case in the vertical direction. The partition plate 13 partitions from the upstream side of the evaporator 4 to the downstream side of the heater core 6. The outside air passage 10 a is a passage through which air blown by the outside air fan 31 flows. The inside air ventilation path 10b is the ventilation path 10a, 10b formed below the outside air ventilation path 10a, and is a passage through which air blown by the inside air side fan 32 circulates. The two ventilation paths 10 a and 10 b merge on the downstream side of the heater core 6.

  The evaporator 4 is a heat exchanger in which low-temperature and low-pressure refrigerant supplied from the refrigeration cycle flows. The evaporator 4 provides heat exchange between the blown air that passes through the heat exchange unit and the refrigerant that circulates inside. In other words, the evaporator 4 cools the blown air. The evaporator 4 is arrange | positioned so that the whole of the external air ventilation path 10a and the inside air ventilation path 10b may be traversed. In other words, the evaporator 4 is disposed so as to be capable of exchanging heat with substantially all the air that passes through the air conditioning case 10. The evaporator 4 is an example of a heat exchanger for cooling.

  The heater core 6 is provided downstream of the evaporator 4. The heater core 6 is a heat exchanger through which engine coolant of the vehicle flows. The heater core 6 provides heat exchange between the blown air that passes through the heat exchanging section and the engine coolant that circulates inside the heater core 6. In other words, the heater core 6 heats the blown air. The heater core 6 is an example of a heat exchanger for heating.

  A passage through which air flowing around the heater core 6 flows is formed above the heater core 6 in the outside air ventilation path 10a. A passage that bypasses the heater core 6 is formed below the heater core 6 in the inside air ventilation path 10b. An air mix door 5 adjacent to the heater core 6 is provided on the upstream side of the heater core 6. The air mix door 5 is provided by various door members such as a slide door and a film door. One air mix door 5 is provided for each of the outside air passage 10a and the inside air passage 10b. The air mix door 5 adjusts the flow rate ratio between the air flowing through the heater core 6 and the air bypassing the heater core 6.

  A defroster opening 8a, a face opening 8b, and a foot opening 8c are provided on the downstream side of the air ventilation paths 10a and 10b in the air conditioning case 10. The defroster opening 8 a is provided above the partition plate 13. The defroster opening 8a is an opening provided closer to the outside air passage 10a than to the inside air passage 10b. Outside air flowing through the outside air ventilation path 10a flows more easily into the defroster opening 8a than inside air flowing into the inside air ventilation path 10b. The defroster opening 8a communicates with a defroster outlet through which air is blown out toward the windshield via a duct or the like. The flow rate of the air flowing into the defroster opening 8a is adjusted by changing the opening of the defroster door 7a. The opening degree of the defroster door 7a is controlled by the air conditioning ECU 100.

  The foot opening 8c is an opening provided below the defroster opening 8a and the face opening 8b. The foot opening 8 c is provided below the partition plate 13. That is, the foot opening 8c is formed closer to the inside air ventilation path 10b than to the outside air ventilation path 10a. Inside air flowing through the inside air ventilation path 10b flows into the foot opening 8c.

  The foot opening 8c communicates with the foot outlet passage 8c1. The foot outlet passage 8c1 is an air passage formed by a duct or the like connected to the foot opening 8c. At the downstream end of the foot outlet passage 8c1, a foot outlet is formed that opens into the passenger compartment and blows air toward the feet of the passenger. The foot outlet is an outlet that blows out air below the face outlet in the passenger compartment.

  The face opening 8b is an opening provided below the defroster opening 8a and above the foot opening 8c. The face opening 8 b is provided above the partition plate 13. The face opening 8b is an opening provided closer to the outside air ventilation path 10a than to the inside air ventilation path 10b. Outside air flowing through the outside air ventilation path 10a flows into the face opening 8b. It is provided downstream of the heater core 6. A face outlet passage 80 is connected to the face opening 8b.

  The face blowing passage 80 is an air passage formed by a duct connected to the face opening 8b of the air conditioning case 10, for example. The face outlet passage 80 includes a common passage 81, a center outlet passage 82 and a side outlet passage 83 that are connected to the downstream side of the common passage 81 and branch from the common passage 81. A face outlet is formed at the downstream end of the face outlet passage 80. The face blowing passage 80 is a passage that blows out the outside air that has circulated through the outside air passage 10a from the face blowing outlet to the upper body of the occupant. The face blowing passage 80 is a passage that blows air from above the foot blowing passage 8c1 in the vehicle interior. In the first embodiment, the face outlet passage 80 is an example of an upper outlet passage.

  The center outlet passage 82 is a passage in which a center face outlet is formed at the downstream end. The center outlet passages 82 are branched from each other by the same number as the center face outlet, for example. The center face outlet is an outlet provided near the center of the passenger compartment in the vehicle width direction. For example, two center face outlets are provided in the vehicle width direction near the center of the instrument panel in the vehicle width direction. The center face air outlet is an air outlet that opens above the foot air outlet in the vertical direction in the passenger compartment. One center face outlet is arranged to face the upper body side of the occupant seated in the driver's seat, and the other is arranged to face the upper body side of the occupant seated in the passenger seat.

  The side blowing passage 83 is a passage communicating with the side face outlet. The side blowing passages 83 are branched from each other by the same number as the side face blowing ports. The side face air outlets are a set of air outlets provided on both sides of the vehicle interior in the vehicle width direction. For example, the side face outlet is provided on the side closer to the side window than the center of the instrument panel in the vehicle width direction. The center outlet passage 82 and the side outlet passage 83 blow out air below the defroster outlet and above the foot outlet in the vehicle interior in the vertical direction.

  Each of the center outlet passage 82 and the side outlet passage 83 is provided with a center outlet door 7bc and a side outlet door 7bs. The opening degree of the center outlet door 7bc and the side outlet door 7bs is controlled by the air conditioning ECU 100. The center blowing door 7bc and the side blowing door 7bs adjust the flow rate of the air blown out from the blowing passages 82 and 83 by changing the opening degree. The center outlet door 7bc and the side outlet door 7bs can be adjusted independently of each other. Or if the mode which can set the opening degree of the side blowing door 7bs small with respect to the opening degree of the center blowing door 7bc is realizable, the structure which each blowing door 7bc and 7bs interlock | cooperate by a mode link etc. may be sufficient. .

  The common passage 81 is a passage communicating with the upstream side of the center outlet passage 82 and the side outlet passage 83. The common passage 81 is a passage through which air before branching into the center outlet passage 82 and the side outlet passage 83 flows. A bypass passage 10 c communicates with the common passage 81. A humidifier 9 is provided in the common passage 81.

  The bypass passage 10c is an air passage formed by branching from the outside air ventilation passage 10a. The bypass passage 10 c is a passage formed so as to branch from the outside air ventilation passage 10 a on the upstream side of the heater core 6 and the evaporator 4 and merge with the face blowing passage 80. That is, the bypass passage 10 c is a passage that guides the inflowing outside air so as to bypass the heater core 6 and the evaporator 4 and flow into the face blowing passage 80. In other words, the outside air flowing through the bypass passage 10 c flows into the face blowing passage 80 without being adjusted in temperature by the evaporator 4 and the heater core 6.

  The bypass passage 10 c communicates with the common passage 81 in the face blowing passage 80. That is, the outside air flowing through the bypass passage 10c is distributed to both the center face outlet and the side face outlet. It can be said that the bypass passage 10 c is a passage that joins the temperature-adjusted air downstream of the heater core 6 and the outside air before being heated by the heater core 6 upstream of the heater core 6. Since the humidifying device 9 is provided in the face blowing passage 80, the bypass passage 10 c can be said to be a passage that joins the air humidified by the humidifying device 9 with the outside air bypassing the heater core 6.

  A bypass door 15 is provided in the bypass passage 10c. The bypass door 15 may be provided by various door members such as a plate door, a slide door, and a film door. The bypass door 15 is controlled by the air conditioning ECU 100 via an electric actuator or the like, and its opening degree is adjusted continuously or stepwise. The bypass door 15 adjusts the flow rate of the air flowing through the bypass passage 10c by changing the air flow area of the air flowing into the bypass passage 10c from the outside air passage 10a by changing the opening degree. Thereby, the bypass door 15 can switch the communication state and the interruption | blocking state of the bypass channel | path 10c. That is, when the bypass door 15 is in an open state opened at an arbitrary opening, the bypass passage 10c is in a communication state, and when the bypass door 15 is in a closed state that substantially closes the bypass passage 10c, the bypass passage 10c is in a closed state. 10c will be in a cutoff state. The bypass door 15 is an example of a switching unit.

  The humidifier 9 is a device that supplies water vapor and / or mist water into the face outlet passage 80. The humidifier 9 is provided by, for example, a water supply type humidifier capable of spraying water stored in a container at an arbitrary timing. The water supply type humidifier 9 is provided by various methods such as an ultrasonic method, a steam method, and a vaporization method. The humidifier 9 is formed so as to be able to supply humidified air in the face outlet passage 80. For example, the humidifier 9 can spray humidified air directly into the face blowing passage 80 from a blowing nozzle or the like that opens into the face blowing passage 80. The humidifying device 9 is provided so that, for example, humidified air can be sprayed toward the downstream side of the air flow flowing through the face blowing passage 80. The operation and stop of the humidifier 9 are controlled by the air conditioning ECU 100.

  The air conditioning ECU 100 includes a microcomputer including a storage medium readable by a computer as a main hardware element. The storage medium is a non-transitional physical storage medium that stores a predetermined program readable by a computer in a non-temporary manner. The storage medium can be provided by a semiconductor memory or a magnetic disk. The air conditioning ECU 100 has a function of executing various control processes by executing various programs stored in the storage medium by a processor such as a CPU. The means and / or function provided by the air conditioning ECU 100 can be provided by software recorded in a storage medium and a computer that executes the software, only software, only hardware, or a combination thereof. For example, when the air conditioning ECU 100 is provided by an electronic circuit that is hardware, it can be provided by a digital circuit including a large number of logic circuits, or an analog circuit. The air conditioning ECU 100 is one of a plurality of ECUs (Electronic Control Units) mounted on the vehicle. Alternatively, a configuration in which a plurality of ECUs share the function of the air conditioning ECU 100 may be employed. The air conditioning ECU 100 is an example of a control unit.

  The air conditioning ECU 100 controls the operation of the vehicle air conditioner 1 based on input information of operation switches provided on an instrument panel or the like and detection information from various sensors provided on the vehicle. The air conditioning ECU 100 performs refrigeration cycle operation control, air blower 3 operation and air volume control, air mix door 5, blowout doors 7 a to 7 c, bypass door 15 opening control, humidification device 9 operation control, and the like. As shown in FIG. 2, the air conditioning ECU 100 includes a humidifying switch 90 that inputs an ON request and an OFF request for the humidifying device 9, a bypass opening switch 150 that requests an open state of the bypass door 15, and a humidity sensor that detects humidity in the vehicle interior. Information from 70 can be acquired. The humidity sensor 70 is provided, for example, between the side face outlet and the side window in the vehicle width direction. If the humidity sensor 70 is provided at a position closer to the side face air outlet than the center face air outlet in the vehicle width direction, it becomes easier to detect the humidity near the side window.

  The air conditioning ECU 100 includes, as functional blocks, a humidification request determination unit 101, a bypass request determination unit 102, a humidity determination unit 103, a humidification execution unit 104, a bypass opening adjustment unit 105, and a face opening adjustment unit 106. Prepare.

  The humidification request determination unit 101 determines whether or not the occupant requests humidification. For example, when the humidification switch 90 is in an ON state, the humidification request determination unit 101 determines that the occupant requests humidification.

  The bypass request determination unit 102 determines whether or not the occupant requests opening of the bypass passage 10c. For example, when the bypass opening switch 150 is in the ON state, the bypass request determining unit 102 determines that the occupant requests opening of the bypass passage 10c. The fact that the occupant requests opening of the bypass passage 10c can be rephrased as that the occupant requests a decrease in the face blowing temperature.

  The humidity determination unit 103 determines the magnitude relationship between the vehicle compartment humidity and the threshold humidity based on the humidity information detected by the humidity sensor 70. The humidity determination unit 103 uses, for example, a plurality of threshold values stored in advance according to the situation.

  The humidification execution unit 104 controls the on state and the off state of the humidifier 9 based on the determinations of the humidification request determination unit 101 and the humidity determination unit 103. The humidifying execution unit 104 turns the humidifying device 9 on when humidification is requested by the occupant and the vehicle interior humidity is lower than the threshold humidity α1. Even when the occupant requests humidification, the humidification execution unit 104 turns off the humidifier 9 if the humidity exceeds the threshold humidity α1.

  The bypass opening adjustment unit 105 adjusts the opening of the bypass door 15. The bypass opening adjustment unit 105 opens the bypass door 15 when the occupant turns on the outside air bypass switch. At this time, the bypass opening adjustment unit 105 opens the bypass door 15 at a preset opening. Or a passenger | crew can adjust the opening degree and the structure which opens the bypass door 15 by the opening degree which the passenger | crew set suitably may be sufficient. The bypass opening adjustment unit 105 is an example of a bypass adjustment unit.

  The face opening adjustment unit 106 adjusts the opening of the center outlet door 7bc and the side outlet door 7bs. The face opening adjustment unit 106 can execute an equal opening mode in which the opening of the side outlet door 7bs and the opening of the center outlet door 7bc are in substantially the same state. In addition, the face opening adjustment unit 106 can execute a side low opening mode in which the opening of the side outlet door 7bs is made smaller than the opening of the center outlet door 7bc. Here, when the opening degree of the side blowing door 7bs is made smaller than the opening degree of the center blowing door 7bc, each opening degree of the plurality of side blowing doors 7bs is larger than any opening degree of the plurality of center blowing doors 7bc. Mean small. It can be said that the side low opening mode is a mode in which the amount of air blown from the side face air outlet is made smaller than the amount of air blown from the center face air outlet.

  Next, an example of the humidification control executed by the air conditioning ECU 100 of the first embodiment will be described with reference to the flowchart of FIG. First, in step S10, the air conditioning ECU 100 determines whether there is a humidification request from an occupant. In step S10, it is determined that there is a humidification request when the humidification switch 90 is input. The process of step S10 corresponds to the process of the humidification request determination unit 101. If it is determined that there is a humidification request, the process proceeds to step S20.

  In step S20, based on the humidity information detected by the humidity sensor 70, it is determined whether or not the vehicle compartment humidity is lower than the threshold humidity α1. The process in step S20 corresponds to the process executed by the humidity determination unit 103. The threshold humidity α1 is, for example, a value stored in advance in the air conditioning ECU 100, and is a threshold at which the occurrence of window fogging is predicted when the humidity further increases. When it is determined in step S20 that the humidity in the vehicle interior is equal to or higher than the threshold humidity α1, the humidity in the vehicle interior increases to the humidity at which window fogging occurs when humidification is performed. Therefore, the flow proceeds to step S24 to avoid this. .

  In step S24, the process which does not operate the humidification apparatus 9 is performed. In other words, the humidifying device 9 is kept in the OFF state. At this time, it may be notified to the occupant by visual information, auditory information, or the like that humidification cannot be performed. When the process of step S24 is completed, the process proceeds to step S25. In step S25, the equal opening mode is executed. That is, when the side low opening mode is executed, the mode is switched to the equal opening mode, and when the equal opening mode is executed, the state is maintained. When the process of step S25 is completed, the process returns to step S10.

  On the other hand, if it is determined in step S22 that the vehicle compartment humidity is lower than the threshold humidity α1, there is no problem even if humidification is performed, and the process proceeds to step S22. In step S22, the humidifier 9 is operated to start humidification. Further, when the humidification has already been started, the operation state is maintained. The process in step S22 corresponds to the process executed by the humidification execution unit 104.

  If the process of step S22 is performed, it will progress to step S23. In step S23, the side low opening mode is executed. Thereby, the air volume of the humidified air which blows off from a side face blower outlet becomes smaller than the air volume of the humidified air which blows off from a center face blower outlet. When the process of step S23 is executed, the process proceeds to step S30.

  In step S30, it is determined whether or not the humidity in the passenger compartment exceeds the threshold humidity α1. If it is determined that the humidity does not exceed the threshold humidity α1, there is no problem even if the humidification is continued, and the process returns to step S10. On the other hand, if it is determined that the vehicle interior humidity exceeds the threshold humidity α1, the process proceeds to step S40 in order to suppress window fogging. The threshold humidity α1 is an example of a humidifying threshold value. That is, the humidity determination unit 103 is also an example of a humidity determination unit during humidification.

  In step S40, the bypass door 15 is opened at a preset opening. Thereby, the outside air in a state before temperature adjustment flows through the bypass passage 10 c and flows into the common passage 81. Thereby, the relatively dry air in winter mixes with the humidified air, and the humidity of the air blown out from the face outlet is lowered.

  After step S40, the process proceeds to step S50. In step S50, it is determined whether or not the vehicle interior humidity has exceeded the threshold humidity α1. If it is determined that the humidity in the passenger compartment exceeds the threshold humidity α1, the process proceeds to step S52. The process of step S50 is one of the processes of the humidity determination unit 103.

  In step S52, the opening degree of the bypass door 15 is adjusted to an opening degree larger than the opening degree at the time of step S50. Thereby, the ratio of the outside air mixed with the humidified air is increased, and the humidity of the air blown out from the face outlet is further reduced. If the process of step S52 is performed, it will return to step S10 again. The amount of increase in the opening degree in step S52 may be a predetermined constant amount or may be an amount that is appropriately changed by the air conditioning ECU 100 based on the difference between the vehicle interior humidity and the threshold humidity α1. Good.

  On the other hand, if it is determined in step S50 that the vehicle compartment humidity is equal to or lower than the threshold humidity α1, the process proceeds to step S54. In step S54, it is determined whether or not the vehicle interior humidity is lower than the threshold humidity α2. If it is determined that it is below, the process proceeds to step S56, where the opening degree of the bypass door 15 is made lower than the opening degree at the time of step S50. In other words, the ratio of the outside air mixed with the humidified air is reduced, and the humidity of the air blown out from the face outlet is increased. If the process of step S56 is performed, it will return to step S10 again. The amount of decrease in the opening degree in step S54 may be a preset constant amount or an amount that is appropriately changed by the air conditioning ECU 100 based on the difference between the vehicle interior humidity and the threshold humidity α2.

  On the other hand, if it is determined in step S54 that the humidity in the passenger compartment is equal to or higher than the threshold humidity α2, the process proceeds to step S58. In step S58, the opening degree of the bypass door 15 is maintained. In other words, the opening degree of the bypass door 15 is not changed. Thereby, when the vehicle interior humidity is between the threshold humidity α1 and the threshold humidity α2, the opening degree of the bypass door 15 can be maintained. If the process of step S58 is performed, it will return to step S10 again and the process of the flowchart of FIG. 3 will be repeated.

  Next, an example of the blowing temperature lowering control executed by the air conditioning ECU 100 of the first embodiment will be described with reference to the flowchart of FIG. For example, the air conditioning ECU 100 performs the processing of FIG. 4 when the heating operation is being performed and the blowout mode in which air is blown out from the face blowout port such as the B / L mode and the face mode is being executed. The air conditioning ECU 100 executes the process of FIG. 4 particularly when the humidifying device 9 is not being executed, that is, when a negative determination is made in step S10 of FIG.

  First, in step S110, the air conditioning ECU 100 determines whether or not there is a request for a decrease in the face blowing temperature by the occupant. That is, in step S110, it is determined whether or not the outside air bypass switch is in the ON state. If it is in the ON state, it is determined that there is a reduction request. Step S <b> 110 is a process executed by the bypass request determination unit 102.

  If it is determined that there is a decrease request, the process proceeds to step S120, and the bypass door 15 is controlled to be opened at a predetermined opening degree. On the other hand, if it determines with there being no reduction request | requirement in step S110, it will progress to step S130 and will control the bypass door 15 to a closed state. Steps S <b> 120 and S <b> 130 are processes executed by the bypass opening adjustment unit 105. When the process of step S120 or step S130 is completed, the process returns to step S110 again and the process of the flowchart is repeated.

  Next, the effect which the vehicle air conditioner 1 of 1st Embodiment brings is demonstrated. The vehicle air conditioner 1 blows the inside air to the air conditioning case 10 in which the inside air ventilation path 10b through which the inside air circulates and the outside air ventilation path 10a through which the outside air circulates and the inside air ventilation path 10b are formed, and the outside air flows into the outside air ventilation path 10a. A blower 3 for blowing air. The vehicle air conditioner 1 is housed in an air conditioning case 10 and has an evaporator 4 that cools the inside air that circulates through the inside air ventilation path 10b and the outside air that circulates through the outside air ventilation path 10a. The vehicle air conditioner 1 includes a heater core 6 that is disposed downstream of the evaporator 4 and that heats the inside air that flows through the inside air ventilation path 10b and the outside air that flows through the outside air ventilation path 10a. The vehicle air conditioner 1 includes a face blowing passage 80 that blows outside air flowing through the outside air ventilation passage 10a toward the upper body of the occupant, and a foot blowing passage 8c1 that blows out inside air flowing through the inside air ventilation passage 10b toward the lower half of the occupant. Have The vehicle air conditioner 1 includes a bypass passage 10c that branches from the outside air passage 10a upstream of the heater core 6 and joins the face outlet passage 80, and a bypass door 15 that switches between a communication state and a cutoff state of the bypass passage 10c. Have. The vehicle air conditioner 1 includes a humidifier 9 that humidifies the air flowing through the face outlet passage 80.

  According to this, a part of the outside air flowing through the heating heat exchanger outside air ventilation passage 10 a can be made to flow through the bypass passage 10 c upstream of the heater core 6 and merge with the face blowing passage 80. For this reason, at the time of heating, the temperature of the air blown out from the face blowing passage 80 by the relatively low temperature outside air can be lowered. In addition, the air flowing into the face outlet passage 80 is humidified by the humidifier 9. As a result, the humidity of the air blown to the upper body of the occupant can be increased. As described above, it is possible to provide the vehicle air conditioner 1 that can increase the humidity of the air blown to the upper body of the occupant and can reduce the temperature of the air blown to the upper body of the occupant.

  The bypass passage 10 c branches off from the outside air ventilation path 10 a upstream of the evaporator 4. According to this, the outside air before being dehumidified by the evaporator 4 can be merged into the face blowing passage 80. Therefore, it is possible to join the face blowing passage 80 without relatively reducing the humidity of the outside air.

  The bypass passage 10 c joins the face blowing passage 80. According to this, it is not necessary to add a passage where the air that has passed through the bypass passage 10c merges. Therefore, the lower-cost vehicle air conditioner 1 can be provided.

  The air conditioning ECU 100 reduces the opening degree of the side blowing door 7bs relative to the opening degree of the center blowing door 7bc when the humidifying device 9 is activated and the bypass passage 10c is in a shut-off state. According to this, when the humidifying device 9 performs humidification, the amount of air blown out from the side face outlet close to the side window can be suppressed. Thereby, the humidity rise near a side window can be suppressed and window fogging can be suppressed.

  The air conditioning ECU 100 determines whether or not the humidity in the passenger compartment is lower than the threshold humidity α1, and if it is determined that the humidity is lower than the threshold humidity α1, the humidifying device 9 starts the humidification. And a humidification execution unit 104 for controlling the above. Thereby, the air conditioner 1 for vehicles can start humidification automatically, when the humidity in a vehicle interior falls.

  The air conditioning ECU 100 has a humidity determination unit 103 that determines whether or not the humidity in the vehicle compartment exceeds the threshold humidity α1 when the humidifying device 9 is in operation and the bypass passage 10c is in a blocked state. The air conditioning ECU 100 includes a bypass opening adjustment unit 105 that controls the bypass door 15 so that the bypass passage 10c is in a communication state when the humidity determination unit 103 determines that the humidity inside the vehicle compartment exceeds the threshold humidity α1. .

  According to this, when the humidity in the vehicle interior exceeds the threshold humidity α1 while the humidifier 9 is performing humidification, the outside air can be merged into the face blowing passage 80 from the bypass passage 10c. Thereby, the humidity of the air blown out from the face blowing passage 80 can be reduced by the relatively dry outside air in winter. Therefore, it is possible to suppress an increase in the vehicle interior humidity.

(Second Embodiment)
2nd Embodiment demonstrates the modification of the vehicle air conditioner 1 in 1st Embodiment. In FIG. 5, components given the same reference numerals as those in the drawing of the first embodiment are the same components and have the same operational effects.

  The air conditioning ECU 100 according to the second embodiment performs control for operating the humidifier 9 based on the humidity in the vehicle interior when the occupant performs control to open the bypass door 15. The humidity determination unit 103 determines whether or not the vehicle compartment humidity is lower than the threshold humidity β when the bypass opening adjustment unit 105 controls the bypass door 15 to be in an open state based on the determination of the bypass request determination unit 102. The humidifying execution unit 104 operates the humidifying device 9 when the humidity determining unit 103 determines that the humidity in the vehicle interior exceeds the threshold humidity β. The threshold humidity β is, for example, a value set in advance in the air conditioning ECU 100, and is a value obtained through experiments or the like as an upper limit value of humidity at which an occupant feels air drying.

  The process which the vehicle air conditioner 1 of 2nd Embodiment performs is demonstrated with reference to the flowchart of FIG. First, in step S210, whether or not there is a bypass opening request from the occupant is determined based on the on state of the bypass opening switch 150. The process in step S210 corresponds to the process executed by the bypass request determination unit 102.

  If it is determined in step S210 that there is no bypass opening request, the process proceeds to step S230. In step S230, the bypass door 15 is controlled to be closed. When the process of step S230 is executed, the process returns to step S210 again.

  On the other hand, if it is determined in step S210 that there is a bypass opening request, the process proceeds to step S220. In step S220, the bypass door 15 is controlled to be in an open state based on the request, and the process proceeds to step S240.

  In step S240, it is determined whether or not the vehicle compartment humidity is below the threshold humidity β. If it is determined that the humidity is lower than the threshold humidity β, the humidity in the passenger compartment has decreased due to the introduction of outside air from the bypass passage 10c, and the process proceeds to step S250. The process of step S240 is a process executed by the humidity determination unit 103. The threshold humidity β is an example of a bypass threshold value. That is, the humidity determination unit 103 is an example of a bypass humidity determination unit.

  In step S250, the humidifier 9 is operated. Thereby, the humidity of the air which blows off from a face blower outlet is raised. For this reason, air that has a lower temperature and is humidified to a certain degree is blown out from the face air outlet. When the process of step S250 is executed, the process returns to step S210 again.

  On the other hand, if the vehicle interior humidity exceeds the threshold humidity β in step S240, the vehicle interior is not dry enough to require humidification, so the process proceeds to step S260 and the operation of the humidifier 9 is stopped. If the operation of the humidifier 9 has already been stopped, the stopped state is maintained. When the process of step S260 is executed, the process returns to step S210 again.

  According to the vehicle air conditioner 1 of the second embodiment, the air conditioning ECU 100 determines that the vehicle interior humidity has the threshold humidity β when the humidifier 9 is not performing humidification and the bypass passage 10c is in communication. It has the humidity determination part 103 which determines whether it is below. When the humidity determination unit 103 determines that the humidity in the vehicle compartment is lower than the threshold humidity β, the humidification execution unit 104 operates the humidifier 9. According to this, the humidification apparatus 9 can be operated when the relatively dry outside air flows in by setting the bypass passage 10c in the communication state and the humidity in the passenger compartment decreases. Therefore, it is possible to suppress a decrease in humidity in the vehicle interior due to the bypass passage 10c being in a communicating state.

(Third embodiment)
3rd Embodiment demonstrates the modification of the vehicle air conditioner 1 in 1st Embodiment. In FIG. 6, components denoted by the same reference numerals as those in the drawing of the first embodiment are the same components and exhibit the same operational effects.

  In the vehicle air conditioner of the third embodiment, the bypass passage 10c is formed so as to branch from the outdoor air passage 10a on the downstream side of the evaporator 4 and on the upstream side of the heater core 6. That is, the air that passes through the evaporator 4 and does not pass through the heater core 6 flows into the bypass passage 10c. The bypass passage 10c branches from the outside air ventilation path 10a on the upstream side of the second air mix door.

  The vehicle air conditioner of the third embodiment can also directly flow outside air that is not heated by the heater core 6 into the face outlet passage. In particular, in the third embodiment, since the outside air cooled by the evaporator 4 flows into the bypass passage 10c, the temperature of the air blown out from the face outlet can be further reduced.

(Fourth embodiment)
4th Embodiment demonstrates the modification of the vehicle air conditioner 1 in 1st Embodiment. In FIG. 7, the constituent elements denoted by the same reference numerals as those in the drawing of the first embodiment are the same constituent elements and exhibit the same operational effects.

  The vehicle air conditioner 1 according to the fourth embodiment includes an outside air side opening 8d and an outside air outlet passage 85. The outside air side opening 8d is an opening through which the air that has flowed through the outside air ventilation path 10a flows out to the outside air blowing passage 85. The outside air side opening 8d is provided independently of the defroster opening 8a and the face opening 8b. In other words, the outside air side opening 8d is an opening formed at a location different from the defroster opening 8a and the face opening 8b in the air conditioning case 10. The outside air side opening 8d is provided above the downstream end of the partition plate 13 in the vertical direction, for example. That is, the outside air side opening 8d is provided closer to the outside air ventilation path 10a than the inside air ventilation path 10b. The amount of air flowing out from the outside air side opening 8d is adjusted by opening control of the outside air outlet door 7d by the air conditioning ECU 100.

  The outside air outlet passage 85 is an air passage that guides the air flowing out from the outside air opening 8d to the outside air outlet. The outside air outlet passage 85 is formed by a duct connected to the outside air opening 8d. The outside air outlet passage 85 is an air passage independent of the face outlet passage 80. The outside air outlet passage 85 is an example of an upper outlet passage.

  The outside air outlet is one of the outlets formed in the vehicle interior. The outside air outlet is an outlet independent of the face outlet. The outside air outlet blows air toward the upper body of the occupant seated in the seat. The outside air outlet blows air above the foot outlet. The outside air outlet is an outlet that blows out air toward the face of an occupant seated in a seat, for example. The outside air outlet blows out air from a position closer to the occupant than the face outlet, for example. The outside air outlet can be provided by, for example, a duct extending from the instrument panel, a duct extending to the ceiling in the passenger compartment, a duct extending from the periphery of the seat, or the like.

  The bypass passage 10 c is branched from the upstream side of the heater core 6 and is formed so as to join the outside air outlet passage 85. In other words, the bypass passage 10 c guides the outside air upstream from the heater core 6 to the outside air blowing passage 85 instead of the face blowing passage 80. Therefore, the bypass passage 10c can lower the temperature of the air blown out from the outside air outlet as compared with the air blown out from the foot outlet or the face outlet.

  The humidifier 9 is provided in the outside air outlet passage 85. That is, the humidifier 9 humidifies the air flowing through the outside air outlet passage 85. Thereby, the humidifier 9 can set the air blown from the outside air outlet to a higher humidity than the air blown from the face outlet or the defroster outlet. The outside air outlet passage 85 is a passage independent of the face outlet passage 80. For this reason, even in the blowing mode in which air is not blown out from the face blowout port, it is possible to blow out humidified air or blow out air whose temperature is lowered with respect to the air blown out from the foot blowing passage 8c1. is there.

(Other embodiments)
The disclosure in this specification is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations by those skilled in the art based thereon. For example, the disclosure is not limited to the combinations of parts and / or elements shown in the embodiments. The disclosure can be implemented in various combinations. The disclosure may have additional parts that can be added to the embodiments. The disclosure includes those in which parts and / or elements of the embodiments are omitted. The disclosure encompasses the replacement or combination of parts and / or elements between one embodiment and another. The technical scope disclosed is not limited to the description of the embodiments. Some technical scope disclosed is indicated by the description of the claims, and should be understood to include all modifications within the meaning and scope equivalent to the description of the claims. .

  In the above-described embodiment, the humidification request determination unit 101 determines that the occupant requests humidification based on the humidification switch 90 being turned on. Instead of this, the humidification request determination unit 101 may determine that the occupant is requesting humidification by voice input, reception of a humidification request signal via the mobile terminal, or the like. The humidification request determination unit 101 may be configured to determine that humidification is requested when an occupant acquires input information associated with a humidification request, and is not limited by an input unit. Similarly, the bypass request determination unit 102 may be configured to determine that a decrease in the blowing temperature is requested when the occupant acquires input information associated with the request for the face blowing temperature, It is not limited to turning on the switch.

  In the above-described embodiment, the heater core 6 is a heat exchanger that provides heat exchange between the engine coolant and the blown air, but may be a condenser in a heat pump cycle.

  In the first embodiment, the bypass passage 10 c is formed so as to merge with the common passage 81 in the face blowing passage 80. Instead of this, the bypass passage 10 c may be formed so as to join the center outlet passage 82 and / or the side outlet passage 83. In particular, when the bypass passage 10c is configured to join only the center outlet passage 82, humid air is not blown out from the side face outlet at a position relatively close to the side window. Can be suppressed.

  In the above-described embodiment, the humidifier 9 is provided by a water supply type humidifier. Instead, the humidifier 9 absorbs moisture in the outside air and / or inside air and supplies the absorbed moisture into the blown air. It may be provided by a water supply type humidifier. As the non-water supply type humidifier, one having an adsorbent capable of adsorbing / desorbing moisture in the air, such as silica gel and zeolite, can be adopted. In the case of using a non-water supply type humidifier, moisture can be adsorbed by the adsorbent by supplying low-temperature outside air flowing through the bypass passage 10c to the humidifier. Further, by supplying the warm air heated by the heater core 6 with the bypass passage 10c closed, moisture can be desorbed from the adsorbent and humidified.

    DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner, 10 Air conditioning case, 100 Air-conditioning ECU (control part), 103 Humidity determination part, 103 Humidity determination part, 103 Bypass humidity determination part, 104 Humidification execution part, 105 Bypass adjustment part, 10a Outside air ventilation 10b internal air passage, 10c bypass passage, 15 switching section, 3 blower, 4 heat exchanger for cooling, 6 heat exchanger for heating, 7bc center outlet door, 7bs side outlet door, 80, 85 upper outlet passage, 8c1 Foot outlet passage, 9 Humidifier.

Claims (8)

An air conditioning case (10) in which an inside air ventilation path (10b) through which the inside air circulates and an outside air ventilation path (10a) through which the outside air circulates are formed;
A blower (3) for blowing the inside air to the inside air ventilation path and blowing the outside air to the outside air ventilation path;
A cooling heat exchanger (4) that is housed in the air conditioning case and cools the inside air flowing through the inside air ventilation path and the outside air flowing through the outside air ventilation path;
A heating heat exchanger (6) for heating the inside air flowing through the inside air ventilation path and the outside air flowing through the outside air ventilation path arranged downstream of the cooling heat exchanger;
An upper blowing passage (80; 85) for blowing the outside air that has circulated through the outside air ventilation path toward the upper body of an occupant;
A foot outlet passage (8c1) for blowing out the inside air flowing through the inside air passage toward the lower body of the occupant;
A bypass passage (10c) branched from the outside air passage upstream from the heating heat exchanger and joined to the upper outlet passage;
A switching unit (15) for switching between a communication state and a blocking state of the bypass passage;
A humidifier (9) for humidifying the air flowing through the upper outlet passage;
A vehicle air conditioner.   2. The vehicle air conditioner according to claim 1, wherein the bypass passage is branched from the outside air ventilation path upstream of the cooling heat exchanger.   3. The vehicle air conditioner according to claim 1, wherein the upper outlet passage is a face outlet passage communicating with the center face outlet and the side face outlet.   3. The vehicle air conditioner according to claim 1, wherein the upper outlet passage is a passage independent of a face outlet passage communicating with the center face outlet and the side face outlet. A center outlet door (7bc) for adjusting the flow rate of air blown from the center face outlet;
A side outlet door (7bs) for adjusting a flow rate of air blown from the side face outlet;
A controller (100) for controlling the opening of the center outlet door and the side outlet door;
With
The controller is
The vehicle air conditioner according to claim 3, wherein the opening degree of the side outlet door is reduced with respect to the opening degree of the center outlet door when the humidifier is operated and the bypass passage is in the shut-off state. . A control unit (100) for controlling the humidifier;
The controller is
A humidity determination unit (103) for determining whether or not the vehicle interior humidity is below a threshold;
A humidifying unit (104) for controlling the humidifying device to start humidification when it is determined that the vehicle interior humidity is below the threshold;
The vehicle air conditioner according to any one of claims 1 to 5, further comprising: A control unit (100) for controlling the humidifier and the switching unit;
The controller is
When the humidifier is operating and the bypass passage is in the shut-off state, a humidity humidity determination unit (103) that determines whether or not the vehicle compartment humidity exceeds a humidity threshold value;
A bypass adjustment unit (105) for controlling the switching unit to bring the bypass passage into the communication state when the humidity determination unit at the humidification determines that the humidity in the vehicle compartment exceeds the humidification threshold; ,
The vehicle air conditioner according to any one of claims 1 to 6, further comprising: A control unit (100) for controlling the humidifier and the switching unit;
The controller is
When the humidifier is not performing humidification and the bypass passage is in the communication state, a bypass humidity determination unit (103) that determines whether or not the vehicle compartment humidity is below a bypass threshold value Have
The vehicle according to any one of claims 1 to 7, wherein the humidifying device is operated when the humidity determination unit at the bypass determines that the humidity in the vehicle interior is below the bypass threshold. Air conditioner.

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