JP2008155893A - Vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular air-conditioner which prevents fogging of a window glass of a vehicle after stopping the operation of an air blowing unit and maintaining cleanness in a case. <P>SOLUTION: Immediately after stopping the operation of an air blowing unit 21, the turning position of an air-mix door 27 is changed by an air-conditioning control unit 38, a downstream end opening of a bypass passage 25 is closed by the air-mix door 27, the turning position of an inner/outer air changing door 20 is changed, an inside air inlet of an intake box 14 is closed by the inner/outer air changing door 20, and an outside air inlet is opened. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner that prevents fogging of a window glass of a vehicle.

  2. Description of the Related Art Conventionally, in a vehicle air conditioner, a heater core passing air flow passing through a heater core and a bypass air flow bypassing the heater core among the air flows blown into the air passage in the case and passed through the evaporator by the operation of the blower fan, The air volume ratio is adjusted by the air mix door. Then, the temperature-adjusted air flow passing through the air mix space is blown out into the vehicle compartment from at least one of the defroster outlet, the vent outlet, and the foot outlet according to each blowing mode. Is done.

  By the way, in winter when the outside air temperature is low, after performing the heating operation in which the air flow cooled by the evaporator and warmed by the heater core is blown into the vehicle interior, the engine is stopped and stopped, and the air conditioner is changed from the operating state to the stopped state. In this case, due to heat radiation from the heater core, the air temperature in the duct of the air conditioner rises, the condensed water generated in the evaporator evaporates, and the duct is in a high humidity state. And when the defroster air outlet near the windshield is open, if the high humidity air is blown out from the defroster air outlet, the windshield is dewed and clouded because the surface temperature of the windshield is low. It may end up.

In recent years, therefore, a vehicle air conditioner for preventing the windshield of the vehicle from fogging has been proposed and put into practical use. For example, in the vehicle air conditioner disclosed in Patent Document 1, when the ignition switch of the vehicle is turned from on to off, the air conditioner is deactivated, and the blowout mode opens the defroster air outlet disposed near the windshield. In the mode, after the elapse of a predetermined time, the outlet control means controls the defroster opening / closing means so as to close the defroster outlet.
JP-A-9-66727

In the vehicle air conditioner disclosed in Patent Document 1, when the air conditioner is stopped, the control unit controls the blowing mode to a mode for closing the defroster outlet, so that high-humidity air is blown from the defroster outlet. This prevents the windshield from fogging.
However, when the defroster air outlet is closed, high-humidity air stays in the narrow space where the evaporator and heater core in the case are gathered for a long time. Then, for example, dirt is generated in the air passage or the like in the case, and there is a problem that the cleanliness in the case cannot be maintained.

  An object of the present invention is to prevent fogging of a window glass of a vehicle after the operation of a blower unit is stopped in a vehicle air conditioner, to maintain cleanliness in a case, and the like.

  An air conditioner for a vehicle according to claim 1 includes a blower, an evaporator that cools the air flow, a heater core that warms the air flow, a heater core passing air flow that passes through the heater core, and a heater core out of the air flow that passes through the evaporator. An air mix adjusting member capable of adjusting the ratio of the bypass air flow to bypass and a case forming an air passage, and the air flow adjusted by the evaporator or the heater core by the operation of the air blowing section near the windshield of the vehicle In the vehicle air conditioner that can be supplied to the opening of the defroster, the passage is formed so that the passage through which the bypass airflow flows is located above the passage through which the heater core passage airflow flows, and the operation of the air blower is stopped. After that, the adjustment member control for controlling the adjustment member for air mix so that the ratio of the bypass air flow is substantially zero. It is provided with a means.

  The air flow blown into the air passage by the operation of the air blower passes through the evaporator, and the ratio of the heater core passing air flow and the bypass air flow is adjusted by the air mixing adjusting member in the air flow passing through the evaporator. Is done. Then, the air flow is air mixed, temperature-adjusted, and supplied to the defroster opening.

  After the operation of the blower is stopped, the adjustment member control means controls the bypass air flow rate to be substantially zero. As a result, for example, after the operation of the air blower is stopped, the condensed water generated in the evaporator evaporates due to heat dissipation from the heater core, and when the inside of the case is in a high humidity state, the high humidity air that has passed through the evaporator is bypassed. It does not enter the defroster opening side through the passage.

  According to a second aspect of the present invention, there is provided a vehicle air conditioner according to the first aspect of the present invention, wherein the air blowing section is installed above the evaporator, and a vertically-facing passage that connects the evaporator and the air blowing section is formed. .

  According to a third aspect of the present invention, there is provided a vehicle air conditioner according to the first aspect of the present invention, wherein the case is provided with a supply passage in a substantially horizontal direction for supplying an air flow from the blower to the evaporator. The heater core passage airflow is formed above the upper wall of the heater core passage.

  A vehicle air conditioner according to a fourth aspect of the present invention is the air conditioner for a vehicle according to any one of the first to third aspects, wherein the air inside the vehicle interior is introduced into the case and the air outside the vehicle interior is introduced into the case upstream of the evaporator. An inside / outside air switching member for switching between introduction of outside air to be introduced is installed, and has an inside / outside air switching control means for switching the inside / outside air switching member to introduction of outside air after the operation of the blower is stopped.

  According to the first aspect of the present invention, the blower includes an air blower, an evaporator, a heater core, an air mix adjusting member, and a case forming an air passage. In this case, the bypass passage is located above the heater core passage. Since the adjustment member control means for controlling the adjustment member for the air mix is provided so that the ratio of the bypass air flow is substantially zero after the operation of the air blower is stopped, the high humidity air flow is provided. It is possible to prevent entry to the defroster opening side through the bypass passage. As a result, a high-humidity air flow is not blown from the defroster opening, and fogging of the window glass can be prevented. In addition, a high-humidity air flow does not stay for a long time in a narrow space where the evaporator and the heater core are arranged, and these can be kept clean.

  According to the second aspect of the present invention, since the air blowing unit is installed above the evaporator and the passage in the vertical direction that connects the evaporator and the air blowing unit is formed, high-humidity air passes through the passage to the air blowing unit. As it rises and stays, it is possible to reliably prevent a high-humidity air flow from entering the defroster opening.

  According to the invention of claim 3, the case is formed with a substantially horizontal supply passage for supplying the air flow from the blower to the evaporator, and the upper wall of the supply passage has a heater core through which the air flow passing through the heater core flows. Since it is formed so as to be above the upper wall of the passage, high-humidity air rises and stays toward the blowing section through the supply passage, so that the high-humidity air flow enters the defroster opening side. It is possible to prevent fogging of the wind glass.

  According to the fourth aspect of the present invention, the inside / outside air switching member is installed upstream of the evaporator, and has the inside / outside air switching control means for switching the inside / outside air switching member to outside air introduction after the operation of the blower is stopped. Therefore, it is possible to release high-humidity air to the outside air, to reliably prevent fogging of the wind glass, to suppress the wet state of the blower unit, and to maintain the cleanliness of the blower unit. In addition, after the engine is stopped, the engine is started again in a short period of time, and the blower unit is in an operating state, so that it is possible to reliably prevent the wind glass from fogging even when the blowing mode is set to the defroster blowing mode.

  In this embodiment, the air blower, the evaporator that cools the air flow, the heater core that warms the air flow, the air flow that passes through the evaporator, the air flow that passes through the heater core, and the bypass air flow that bypasses the heater core. The air flow adjusting member and the case that forms the air passage are supplied to the defroster opening near the window glass of the vehicle. It is an example at the time of applying this invention to the possible vehicle air conditioner.

Embodiment 1 of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, this is an example in which an air conditioner C is mounted on a left-hand drive vehicle in which a steering wheel 2 is provided on the left portion of an instrument panel 1. As shown in FIG. 2, the resin instrument panel 1 is provided on the vehicle rear side of the dash panel 3 that partitions the engine room R1 in which the engine E is accommodated and the vehicle compartment R2. In FIG. 1, the right is the right side when the vehicle is viewed from the rear to the front.

  A cluster 4 that accommodates a speed meter and the like is disposed on the left part of the instrument panel 1 located in front of the steering wheel 2, and a vehicle occupant is provided with an air conditioner near the center in the vehicle width direction (left-right direction). A plurality of operation dials 5 for adjusting the C operation mode and the blowing mode are provided. The center console 6 that extends from the vicinity of the lower part of the operation dial 5 toward the inside of the passenger compartment R2 is provided with a shift operation unit 8 having a shift lever 7. Is arranged at a height position where it is easy to operate. A floor console (not shown) is connected to the rear side of the center console 6.

  Above the operation dial 5, a space for installing audio, navigation, and the like is formed. Near the left and right sides of this installation space, a pair of left and right vertical ventilators 9 are provided in the substantially central portion of the instrument panel 1, and from these ventilators 9 toward the center in the passenger compartment R2. Air-conditioned air is blown out. Vertical ventilators 9 are also provided at the left and right ends of the instrument panel 1, respectively, so that conditioned air blows out toward the driver seat and passenger seat passenger in the passenger compartment R2. A defroster 11 is provided at the front end of the upper surface of the instrument panel 1 so that conditioned air blows out toward the windshield 10 and the vicinity thereof.

  Here, the instrument panel 1 includes an instrument panel member 12 as a strength member made of a steel pipe that extends in the vehicle width direction and is supported on the left and right ends by the vehicle body. The instrument panel member 12 is located near the lower part inside the instrument panel 1 and penetrates an air conditioning unit 13 described later in the vehicle width direction.

As shown in FIGS. 1 and 2, the air conditioner C includes an intake box 14 that sucks air outside or inside the vehicle compartment, an air conditioning unit 13, and a control device 38 (see FIG. 3).
The air conditioning unit 13 is housed in a substantially central portion in the vehicle width direction inside the instrument panel 1, and is a so-called full center type in which a blower portion 21, a metal evaporator 16 and a heater core 17 are integrated in the central portion. Is. The air-conditioning unit 13 air-conditions in a required temperature and humidity state by cooling the air sucked from the vehicle compartment or from the vehicle compartment via the intake box 14 by the operation of the air blower 21 with the evaporator 16 or warming with the heater core 17. It generates air.

  As shown in FIG. 2, a vent duct 18 and a defroster duct 19 are disposed on the air conditioning unit 13. The downstream end of the vent duct 18 is connected to the ventilator 9, and the downstream end of the defroster duct 19 is connected to the defroster 11. The right side wall of the air conditioning unit 13 is formed with an inlet (not shown) through which air taken from outside or inside the passenger compartment is introduced into the case 15, and an intake box 14 is connected to the inlet.

  The intake box 14 is formed with an inside air introduction port communicating with the vehicle interior and an outside air introduction port communicating with the outside of the vehicle compartment via a duct. An inside / outside air switching door (inside / outside air switching member) 20 is rotatably provided in the intake box 14, and the inside air introduction port and the outside air introduction port are alternatively selected depending on the rotation position of the inside / outside air switching door 20. The air is closed, and the air outside or inside the vehicle compartment is sucked into the blower 21 through the introduction port.

  The blower unit 21 is a centrifugal blower fan including a multiblade fan and a motor 50 (see FIG. 3) that rotates the multiblade fan, and is housed in an upper portion of the case 15. The lower end of the blower unit 21 communicates with an air feed passage 22 that sends the air flow blown out from the blower unit 21 downward. The air feed passage 22 extends in the vertical direction so as to communicate the evaporator 16 and the blower unit 21, and the evaporator 16 for cooling the air flow is disposed at the lower end thereof.

  The evaporator 16 is, for example, a tube and fin type in which aluminum alloy tubes and heat transfer fins are alternately arranged and integrated, and is arranged vertically so that the extending direction of the tubes is the vertical direction. Has been. Refrigerant (chlorofluorocarbon) depressurized via an expansion valve flows into the evaporator 16 from the refrigerant circuit in the engine room R1 via the cooler pipe. And the refrigerant | coolant and air flow which flow through this inside are heat-exchanged, and an air flow is cooled. When this air flow is cooled, condensed water is generated on the surfaces of the fins and tubes.

  On the downstream side of the evaporator 16, of the air flow that has passed through the evaporator 16, a heater core passage 24 that guides the air flow to the heater core 17 and a bypass that is formed above the heater core passage 24 and that bypasses the heater core 17. A passage 25 is defined by a partition wall, and these passages 24, 25 communicate with the air feed passage 22. The heater core passage 24 extends from the rear side of the evaporator 16 while curving so that the instrument panel member 12 penetrating the air conditioning unit 13 extends from the lower side toward the upper side. Therefore, the flow of air flowing into the heater core passage 24 is a smooth flow that draws a substantially J shape in a side view.

  The heater core 17 is arranged in the middle of the heater core passage 24 so as to extend downwardly downward from immediately below the instrument panel member 12. The heater core 17 is a tube-and-fin type like the evaporator 16, and a high-temperature coolant is introduced from the engine side. Heat exchange between the high-temperature engine coolant flowing in the tube of the heater core 17 and the air flow that has passed through the evaporator 16 heats the air flow.

  The downstream ends of the heater core passage 24 and the bypass passage 25 communicate with the air mix space 26 formed on the upper rear side in the case 15 from below. Below the air mix space 26 is a U-shaped air mix door (air mix adjusting member) 27 in a side view in which the passage opening areas at the downstream ends of the heater core passage 24 and the bypass passage 25 can be adjusted. An air mix door 27 that adjusts the amount and ratio of the air flow through the heater core and the bypass air flow into the air mix space 26 is provided so as to be rotatable around a fulcrum.

  In the upper part of the air mix space 26, a vent outlet 28 and a defroster outlet 29 are opened side by side, and a vent door 30 and a defroster door whose passage opening area can be adjusted are respectively provided in the outlets 28 and 29. 31 is disposed. The vent outlet 28 is connected to the upstream end of the vent duct 18 in the instrument panel 1, and the defroster outlet 29 is connected to the upstream end of the defroster duct 19.

  A foot outlet 32 communicates with the outlet passage 37 extending obliquely downward rearward at the rear lower portion of the air mix space 26, and a passage opening of a communication portion with the air mix space 26 is formed at the upper end of the foot outlet 32. A foot door 33 whose area can be adjusted is provided.

Here, the operation of the vehicle air conditioner C configured as described above will be described.
In the air conditioning unit 13, the air flow blown into the air feed passage 22 by the operation of the air blower 21 flows from the upstream end side to the downstream end side of the air feed passage 22 as shown by the arrow in FIG. By passing, the air flow is cooled. This evaporator-passed air flow branches into the heater core passage 24 and the bypass passage 25 as shown by the arrows in FIG. 2 according to the distribution ratio of the air volume determined by the rotational position of the air mix door 27, and toward the heater core passage 24 side. The air flow passing through the evaporator is warmed by passing through the heater core 17.

  The air flow (warm air and cold air) branched into the heater core passage 24 and the bypass passage 25 merges and mixes in the air mix space 26, and is adjusted to conditioned air having a required temperature and humidity. The conditioned air is supplied to the ventilator 9 from at least one of the vent outlet 28, the defroster outlet 29, and the foot outlet 32 in accordance with the opening degree of each of the vent door 30, the defroster door 31, and the foot door 33. The defroster 11 is supplied into the passenger compartment R2 via a foot outlet (not shown).

Next, the control system of the vehicle air conditioner C will be described.
As shown in FIG. 3, the air conditioning control unit (control device) 38 includes a microcomputer including a CPU 39, a ROM 40, and a RAM 41, an input interface 43 and an output interface connected to the microcomputer via a bus 42 such as a data bus. 44 etc. The input interface 43 includes an ignition switch 45, an operation dial 5, an outside air temperature detection sensor 46 for detecting the temperature outside the vehicle interior, an inside air temperature detection sensor 47 for detecting the temperature inside the vehicle interior, The vehicle interior set temperature detection sensor 48 for detecting the set temperature of the vehicle, the solar radiation amount detection sensor 60 for detecting the amount of solar radiation entering the vehicle interior, and the engine coolant temperature detection for detecting the engine coolant temperature A sensor 61 or the like is connected.

  The output interface 44 includes an inside / outside air switching actuator (for example, an electric motor or a solenoid) 49 that switches the opening position of the inside / outside air switching door 20 and a power transistor 51 that supplies power to the fan motor 50 of the operating unit 21. Are connected to an air mix door switching actuator 52 that switches the rotational position of the air mix door 27 and a discharge port switching actuator 53 that switches the opening positions of the various doors 30, 31, 33.

  In the ROM 40 of the air conditioning control unit 38, based on signals input from the ignition switch 45, the operation dial 5, and various detection sensors 46 to 48, 60 and 61, the rotational position of the air mix door 27 and the various doors 30 and 31. , 33 opening degree adjustment, a program for controlling the operating state of the motor 50, and the like are stored in advance.

Next, a flowchart of air conditioning control executed by the air conditioning control unit will be described with reference to FIG. In the figure, Si (i = 1, 2, 3...) Indicates each step.
First, while the vehicle is traveling, the outside air temperature, the inside air temperature, the set temperature in the passenger compartment, the amount of solar radiation, the engine coolant temperature, etc. are read by various sensors 46 to 48, 60, 61, and these values are read by the air conditioning control unit 38. Entered. Next, it is determined whether or not the ignition switch 45 has been operated from on to off (S2). That is, it is determined whether or not the operating unit 21 has switched from the operating state to the stopped state. When the ignition switch 45 is not operated from on to off (S2; Yes), that is, when the ignition switch 45 is on, normal air conditioning control is executed in accordance with the operation of the operation dial 5 by the passenger. (S3).

  In this normal air conditioning control, the air volume of the conditioned air blown from each outlet and the rotational position of the air mix door 27 based on the operation mode and the blowing mode set according to the operation of the operation dial 5 by the occupant. The opening adjustment of the various doors 30, 31, and 33 and the rotation position of the inside / outside air switching door 20 are controlled. There are three operation modes: a heating operation mode for heating, a cooling operation mode for cooling, and an intermediate operation mode between the heating and cooling modes. The blow mode is a vent mode in which conditioned air is blown out from the ventilator 9 toward the upper body of the occupant, a differential mode in which conditioned air is blown out from the defroster 11 toward the windshield 10, and a foot of the occupant from the foot outlet (not shown). There are blowing modes such as a foot mode that blows conditioned air toward

  For example, when the vent mode is set as the blowing mode, the vent door 30 is fully opened. In addition, when the differential mode is set, the defroster door 31 is fully opened. When the foot mode is set, the foot door 33 is fully opened.

  As the operation mode, for example, when the cooling operation mode (full call mode) is set, the rotation position of the air mix door 27 is switched as shown in FIG. 5 to close the downstream end opening of the heater core passage 24. Therefore, during the heating operation, the air flow cooled through the evaporator 16 flows to the bypass passage 25 without flowing to the heater core passage 24. For example, when the heating operation mode is set as the operation mode, the rotation position of the air mix door 27 is switched and the downstream end opening of the bypass passage 25 is closed as shown in FIG. Accordingly, during the heating operation, the air flow cooled through the evaporator 16 does not flow into the bypass passage 25 but flows into the heater core passage 24. The normal air conditioning control can be executed by manual control or automatic control.

  On the other hand, as shown in FIG. 4, if it is determined in S2 that the ignition switch 45 has been operated from on to off (S2; No), whether or not the ignition switch 45 has been off for a predetermined time. Is determined (S4). If it is determined that the predetermined time has elapsed since the ignition switch 45 was turned off (S4; No), the process returns to the start.

  In the case of immediately after the ignition switch 45 is turned off (immediately after the operation unit 21 is switched to the operation stop state) (S4; Yes), the ratio of the inflow amount of the bypass air flow to the air mix space 26 is zero. As shown in FIG. 6, the air mix door 27 is rotated to a U-shaped rotation position in the side view on the downstream end side of the bypass passage 25 to close the opening at the downstream end of the bypass passage 25. To do. Next, the inside / outside air switching door 20 is rotated to the inside air introduction port side, the inside air introduction port of the intake box 14 is closed, and the outside air introduction port is opened (S6). The adjustment member control means is composed of S5 and the control device 38 in the flowchart shown in FIG. 2, and the inside / outside air switching control means is composed of S6 and the control device 38 in the flowchart of FIG.

Next, operations and effects of the vehicle air conditioner of the first embodiment described above will be described.
Immediately after the ignition switch 45 is operated from on to off and the operation unit 21 stops operating, the condensed water generated in the evaporator 16 evaporates due to heat dissipation from the heater core or heat of the outside air, and the inside of the case 15 becomes in a high humidity state.

  In this state, as shown in FIG. 6, the air-conditioning control unit 38 switches the rotational position of the air mix door 27, the downstream end opening of the bypass passage 25 is closed by the air mix door 27, and the inside / outside switch door 20 is closed. The rotation position is switched, and the inside / outside air switching door 20 is controlled so that the inside air introduction port of the intake box 14 is closed and the outside air introduction port is opened. The opening of the outside air inlet was cooled so that the temperature of the engine became a predetermined temperature (30 to 50 degrees for water temperature) or less after the operation of the engine was stopped by turning off the ignition switch 45. The introduction of a strange odor to the outside air can be suppressed by performing it for a limited period of time from the time when the state is reached. In this case, the opening of the outside air inlet may be controlled based on the engine water temperature or the timer.

  As a result, the flow of high-humidity air flow from the downstream end opening of the bypass passage 25 into the air mix space 26 is blocked, and the air flow rises toward the blower 21 and stays in the blower 21 or is released to the outside air. Is done. As a result, the high-humidity air flow can be prevented from entering the defroster opening side, the high-humidity air flow is not blown out from the defroster 11, and the windshield 10 can be prevented from being fogged.

  In addition, a high-humidity air flow does not stay for a long time in the narrow space in which the evaporator 16 and the heater core 17 are disposed in the case 15, and these can be kept clean. In particular, in the present embodiment, the evaporator 16 and the heater core 17 are made of metal, and a high humidity air flow stays around the evaporator 16 and the heater core 17 so that the state in which the exposed water droplets are attached is extremely long. It won't be impossible to maintain cleanliness. Furthermore, thermal deterioration of the sheet member provided in the case 15 can be prevented.

  When a high-humidity airflow is released to the outside air, the wet state of the blower 21 due to the high-humidity airflow can be suppressed, and the cleanliness of the blower 21 can be maintained. Moreover, even after the engine is stopped, the engine is started again in a short time, and the blower unit 21 is in the operating state, so that the windshield 10 can be reliably prevented from being fogged even when the blowing mode is set to the defroster blowing mode. In the present invention, the opening of the outside air inlet is not necessary, and a high-humidity air flow may remain in the air blowing portion 21 that is a large-capacity space with few metal parts. In this case, the amount of water droplets exposed per unit area on the inner surface of the blower portion 21 is small, and it is easy to dry, so that cleanliness can be maintained in long-term use.

  Next, the vehicle air conditioner C1 according to the second embodiment will be described with reference to FIGS. Example 2 is an example when the control system of the air conditioner C of Example 1 is applied. In addition, the same code | symbol is attached | subjected to the member similar to the air conditioner C of the said Example 1 among this air conditioner C1, and description is abbreviate | omitted.

As shown in FIG. 7, the air conditioner C1 includes an intake box 14 for sucking air outside or inside the vehicle compartment, an air conditioning unit 13a, and a control device 38 (see FIG. 3).
As shown in FIGS. 7 and 8, the air conditioning unit 13 a has a blower 34 disposed in the front instrument panel 1 on the front passenger seat side, and an evaporator at a substantially central portion in the vehicle width direction inside the instrument panel 1. This is a so-called semi-center type in which 16 and the heater core 17 are integrated.

  As shown in FIG. 8, the case 15 a of the air conditioning unit 13 a has a supply passage 54 extending in a substantially horizontal direction from the side of the evaporator 16, and a supply passage opening 35 at a communication portion between the supply passage 54 and the blower 34. And are formed. The upper wall of the supply passage 54 is formed to be above the upper wall of the heater core passage 24 through which the heater core passage air flow flows. An inlet port 36 for introducing air taken from outside or inside the vehicle compartment into the air blowing unit 34 is formed on the upper wall of the air blowing unit 34, and the intake box 14 having the inside / outside air switching door 20 is provided in the inlet port 36. It is connected.

The operation and effect of the vehicle air conditioner of the second embodiment described above will be described.
Immediately after the ignition switch 45 is operated from on to off and the operation unit 35 is stopped, the air-conditioning control unit 38 switches the rotational position of the air mix door 27 as shown in FIG. The downstream end opening of the passage 25 is closed, the rotation position of the inside / outside air switching door 20 is switched, and the inside / outside air switching door 20 closes the inside air introduction port in the intake box 14 so that the outside air introduction port is opened. Controlled.

  Therefore, the flow of high-humidity air flow from the downstream end opening of the bypass passage 25 into the air mix space 26 is blocked, and the air flow passes through the evaporator 16 to the supply passage opening 35 via the supply passage 54. It rises toward and stays in the blower 34 or is discharged to the outside air. As a result, it is possible to reliably prevent the high-humidity air flow from entering the defroster opening side and to prevent the windshield 10 from being fogged. Moreover, the wet state of the ventilation part 34 by a high humidity airflow can be suppressed, and the cleanliness of the ventilation part 34 can be maintained.

Next, a modified example in which the first and second embodiments are partially modified will be described.
1] In the first and second embodiments, as the control of the air mix door 27 after the operation of the air blowers 21 and 34 is stopped, it is determined whether the ignition switch 45 is turned off during the operation of the air conditioners C and C1. Instead, the air mix door 27 may be controlled as in the present invention after a predetermined time (5 to 10 seconds) has elapsed after the ignition switch 45 is turned off.

2] Immediately after the ignition switch 45 is operated from on to off, the motor 50 of the blower units 21 and 34 is controlled to rotate in reverse so that the air flow of high humidity is reversed by the blower units 21 and 34. May be. In this case, the scavenging performance of the high humidity air flow can be improved.

3) In a vehicle that employs a smart entry system using a portable radio signal transmitter (smart key), when the vehicle occupant gets out of the vehicle and locks the door, the air-conditioning control unit 38 causes the defroster door 31 to be fully closed. The defroster opening may be closed by controlling so that

4] In addition, those skilled in the art can implement the present invention by adding various modifications to the first and second embodiments without departing from the spirit of the present invention, and the present invention includes such modifications. Is.

1 is a perspective view of an instrument panel on which a vehicle air conditioner according to Embodiment 1 of the present invention is mounted. It is a longitudinal cross-sectional view which shows the internal structure of a vehicle air conditioner. It is a figure which shows the control system of a vehicle air conditioner. It is a figure which shows the flowchart of air-conditioning control. It is a longitudinal cross-sectional view which shows the internal structure of the vehicle air conditioner at the time of air_conditionaing | cooling operation. It is a longitudinal cross-sectional view which shows the internal structure of the vehicle air conditioner at the time of heating operation. It is a perspective view of the instrument panel by which the vehicle air conditioner concerning Example 2 is mounted. It is a longitudinal cross-sectional view which shows the internal structure of the vehicle air conditioner of Example 2. FIG.

Explanation of symbols

C, C1 Vehicle air conditioner 10 Window glass 11 Defroster 15 Case 16 Evaporator 17 Heater core 21, 34 Blower 22 Air feed passage 24 Heater core passage 25 Bypass passage 20 Inside / outside air switching member 27 Air mix adjustment member 38 Control device 54 Supply passage

Claims (4)

The ratio of the air blower, the evaporator that cools the air flow, the heater core that warms the air flow, the air flow that passes through the evaporator, the air flow passing through the heater core, and the bypass air flow that bypasses the heater core. A vehicle comprising an adjustable air-mix adjustment member and a case forming an air passage, and capable of supplying an air flow adjusted by an evaporator or a heater core to the defroster opening in the vicinity of the window glass of the vehicle by the operation of the air blowing unit Air conditioner for
In the case, the passage through which the bypass airflow flows is formed so as to be above the passage through which the heater core passage airflow flows,
After the operation of the air blowing section is stopped, an adjustment member control means is provided for controlling the adjustment member for air mix so that the ratio of the bypass air flow is substantially zero.
An air conditioner for a vehicle.   2. The vehicle air conditioner according to claim 1, wherein the air blowing unit is installed on an upper side of the evaporator, and a passage in a vertical direction is formed to communicate the evaporator and the air blowing unit.   The case is formed with a substantially horizontal supply passage for supplying the airflow from the blower to the evaporator, and the upper wall of the supply passage is above the upper wall of the heater core passage through which the heater core passage airflow flows. The vehicle air conditioner according to claim 1, wherein the vehicle air conditioner is formed as follows. Upstream from the evaporator, an inside / outside air switching member for switching between introduction of inside air for introducing air inside the vehicle interior into the case and introduction of outside air for introducing air outside the vehicle compartment into the case,
The vehicle air conditioner according to any one of claims 1 to 3, further comprising an inside / outside air switching control means for switching the inside / outside air switching member to outside air introduction after the operation of the air blowing section is stopped.

Images