JP2017171122A - Air conditioning device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress flapping noise of a sub-door due to pressure fluctuation inside a vehicle interior when closing a vehicle that is in an open state when an auxiliary inside air introduction port is installed in an air blower casing and an inside air/outside air changeover damper controls so as to be capable of changing-over an inside air/outside air mixing mode.SOLUTION: When a door is detected to be in an opening state while an inside air/outside air mixing mode is chosen, a control device controls an inside air/outside air changeover actuator so as to increase an opening degree of an outside air introduction port relative to that when a door is in a closed state.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a vehicle air conditioner mounted on, for example, an automobile, and particularly relates to a technical field in which air outside a vehicle interior and air inside the vehicle interior are simultaneously introduced as conditioned air to adjust the temperature.

  In general, an air conditioner for a vehicle is provided with an inside / outside air switching device for selecting air inside the vehicle interior (inside air) and air outside the vehicle interior (outside air) and introducing it as air conditioning air. The inside / outside air switching device includes a blower casing in which an inside air introduction port for introducing inside air and an outside air introduction port for introducing outside air are formed. An inside / outside air switching damper that opens and closes the inside air introduction port and the outside air introduction port is provided in the blower casing. The introduced air-conditioning air is temperature-adjusted by a cooling heat exchanger, a heating heat exchanger, etc., and then blown out from the selected outlet among the defroster outlet, vent outlet, and heat outlet to the passenger compartment. It is like that.

  As the inside / outside air switching device, for example, as disclosed in Patent Document 1, an auxiliary inside air introduction port different from the inside air introduction port is provided in the blower casing, and the auxiliary inside air introduction port is connected to the inside / outside air switching damper. Is known that can be opened and closed by another subdoor. In Patent Document 1, the sub door is fixed to the blower casing with a screw, and when the outside air is introduced, the sub door is bent and deformed so as to open the auxiliary inside air introduction port due to the negative pressure in the blower casing, thereby partially introducing the inside air. The heating efficiency is improved.

  In addition, the vehicle air conditioners disclosed in Patent Documents 2 and 3 control the inside / outside air switching damper to adjust the temperature by introducing the inside air, and then adjust the temperature by introducing the inside air circulation mode to be supplied to the vehicle interior and the outside air. Then, after the temperature is adjusted by introducing both the outside air and the outside air to be supplied into the vehicle interior, the internal air and the outside air mixing mode to be supplied into the vehicle interior can be switched to three intake modes. Has been. Auto air conditioner control that automatically sets the intake mode, blowing mode, air volume, blowing temperature, etc. based on the conditions inside and outside the cabin (interior temperature, outside temperature, solar radiation) and the set temperature set by the passenger Is called.

  In Patent Document 2, the introduction ratio of outside air and inside air can be changed in the inside / outside air mixing mode, and the inside air circulation mode is set when the humidity inside the vehicle measured by the humidity sensor is 20% or less, and the outside air introduction mode when 50%. It is said.

  In Patent Document 3, a determination unit that determines whether or not the window glass is likely to be fogged is provided. When the determination unit determines that the window glass is not easily fogged, at least the inside air is circulated and the determination unit determines that the window glass is likely to be fogged. As an outside air introduction mode, the window glass is prevented from being fogged. Furthermore, a control mode for gradually increasing the inside air circulation amount in the inside / outside air mixing mode, a control mode for maintaining the ratio between the inside air and the outside air, and a control mode for gradually increasing the amount of outside air introduced in the inside / outside air mixing mode are provided. The control mode is selected based on the ease of fogging of the window glass. There is an advantage that the amount of energy consumed for heating can be reduced by increasing the inside air circulation amount in a range where the window glass is not fogged, thereby reducing the ventilation amount.

JP 2001-39145 A JP-B-1-27891 Japanese Patent No. 5152355

  As described above, in Patent Document 1, it is possible to introduce part of the internal air by providing an auxiliary internal air introduction port in the blower casing, thereby improving the heating efficiency. In Patent Documents 2 and 3, the ventilation amount is controlled by the internal / external air mixing mode. Decrease heating efficiency.

  Therefore, it is conceivable to further improve the heating efficiency by controlling the inside / outside air mixing mode of Patent Documents 2 and 3 in the structure in which the auxiliary inside air introduction port of Patent Document 1 is provided. However, there are concerns that problems may occur in the cases described below.

  Specifically, in the inside / outside air mixing mode of Patent Documents 2 and 3, the inside / outside air switching damper may stop at an intermediate position, that is, at a position where both the inside air introduction port and the outside air introduction port are opened. In this state, for example, when the door of a vehicle in an open state is closed when an occupant gets on or off, the pressure in the passenger compartment suddenly increases and then decreases rapidly, resulting in an instantaneous pressure fluctuation in the passenger compartment. The sub-door of Literature 1 may bend in the direction to open the auxiliary inside air inlet and then return to the original closed state, and such a deformation of the sub-door may generate a flapping sound. Since the sub door is arranged in the passenger compartment, the rattling sound of the sub door may be heard by the passenger as an abnormal noise.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an auxiliary internal air introduction port that is opened and closed by a sub door in the blower casing and to be switched to an internal / external air mixing mode by an internal / external air switching damper. In the case of the control, it is to suppress the flapping sound of the sub door due to the pressure fluctuation in the passenger compartment when closing the door of the vehicle in the open state.

  In order to achieve the above object, according to the present invention, when the door of the vehicle is in an open state, the opening of the outside air inlet is increased so that the air in the passenger compartment can be easily moved outside the passenger compartment. Reduced sudden pressure rise in the passenger compartment when closed.

The first invention is
A blower casing formed with an inside air introduction port and an auxiliary inside air introduction port that introduces air inside the vehicle compartment and circulates it into the vehicle compartment, and an outside air introduction port that introduces air outside the vehicle compartment;
An inside / outside air switching damper that is provided in the blower casing and opens and closes the inside air inlet and the outside air inlet;
Driving means for driving the inside / outside air switching damper;
A sub door made of a flexible member provided in the blower casing and opening and closing the auxiliary inside air inlet;
A control device for controlling the driving means,
The control device detects the easiness of fogging of the window glass of the vehicle, and if the window glass is likely to be fogged based on the detection result, the driving means to operate the inside / outside air switching damper in a direction in which the outside air introduction amount increases. On the other hand, when the window glass is difficult to fog, the vehicle air conditioner is configured to be able to select the inside / outside air mixing mode for controlling the driving means to operate the inside / outside air switching damper in the direction in which the inside air circulation amount increases. In the device
The vehicle air conditioner includes a door open / close state detecting means for detecting an open / close state of a door provided in the vehicle,
When the door open / closed state detecting means detects that the door is in an open state when the inside / outside air mixing mode is selected, the control device is more effective than when the door is in a closed state. The outside air inlet opening degree increasing control for controlling the driving means is performed so that the opening degree of the outside air inlet opening is increased, while the door open / closed state detecting means detects that the door is closed. In this case, the outside air inlet opening degree increase control is prohibited.

  According to this configuration, when the outside air is introduced, the sub door is bent and deformed so as to open the auxiliary inside air introduction port due to the negative pressure in the blower casing, so that a part of the inside air is also introduced to improve the heating efficiency. Moreover, when the inside / outside air mixing mode is selected, the outside air introduction amount and the inside air circulation amount are changed based on the ease of fogging of the window glass, so that the inside air circulation amount can be increased within a range where the window glass does not fog up. As a result, the ventilation amount is reduced and the energy consumption required for heating is reduced.

  Further, when the inside / outside air mixing mode is selected, when it is detected that the door of the vehicle is in the open state, the opening degree of the outside air introduction port becomes larger than when the door is in the closed state. As a result, the air in the passenger compartment can be easily moved out of the passenger compartment, so that when the door is closed, the air in the passenger compartment is released from the outside air introduction port, thereby reducing a sudden increase in pressure in the passenger compartment. Is done. Therefore, the flapping sound of the sub door is suppressed.

  In the present invention, when the door of the vehicle is closed, the outside air inlet opening increase control is prohibited, but since the actual air conditioning control is delayed, the open door is closed. At the moment, the opening degree of the outside air introduction port is still in a large state, so that a sudden pressure increase in the vehicle interior at the moment when the door is closed is reduced.

According to a second invention, in the first invention,
The control device is configured to fully open the outside air inlet when performing the outside air inlet opening degree increase control.

  According to this configuration, since the outside air inlet is fully opened when the vehicle door is in the open state, air in the vehicle interior easily escapes from the outside air inlet when the door is closed, and the sub-door flutters. The sound suppression effect is further enhanced.

According to a third invention, in the first or second invention,
The sub door is formed in a plate shape extending in the vertical direction, and an upper end portion is attached to the auxiliary internal air introduction port in the blower casing, and a lower end portion is a free end.

  According to this configuration, when the outside air is introduced, the lower end portion of the sub door is displaced in a direction to open the auxiliary inside air introduction port due to the negative pressure in the blower casing, whereby the auxiliary inside air introduction port is reliably opened. If the lower end of the sub door is a free end, the auxiliary inside air inlet can be easily opened.On the other hand, it is considered that fluttering noise is likely to occur due to pressure fluctuations. Since the sudden pressure increase in the passenger compartment when the vehicle is in a state is reduced, the flapping noise of the subdoor can be suppressed even if the subdoor is configured to open easily.

  According to the first aspect of the invention, the auxiliary inside air opening that is opened and closed by the sub door is provided in the blower casing and can be controlled to be switched to the inside / outside air mixing mode by the inside / outside air switching damper, so that the heating efficiency can be improved. And when the door of the vehicle is in the open state, the opening degree of the outside air inlet can be increased so that the air in the vehicle interior can be released to the outside of the vehicle interior, so a sudden pressure increase in the vehicle interior when the door is closed The fluttering sound of the sub door can be suppressed.

  According to the second invention, since the outside air inlet can be fully opened when the vehicle door is in the open state, the air in the vehicle compartment can easily escape from the outside air inlet when the door is closed. Thus, the effect of suppressing the flapping sound of the subdoor can be further enhanced.

  According to the third invention, a plate-like subdoor that extends in the vertical direction, the upper end thereof is attached to the blower casing, and the lower end is a free end, so that the auxiliary inside air inlet can be easily opened. Even with such a configuration, the flapping sound of the subdoor can be suppressed.

It is a figure showing the schematic structure of the air-conditioner for vehicles concerning an embodiment. It is a perspective view which shows the ventilation unit of a vehicle air conditioner. It is sectional drawing of a ventilation unit. It is a block diagram of a vehicle air conditioner. It is a flowchart which shows the control procedure by a control apparatus. It is a flowchart which shows an intake control procedure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a diagram showing a schematic structure of a vehicle air conditioner 100 according to an embodiment of the present invention. The vehicle air conditioner 100 includes a blower unit 1 for blowing air for air conditioning, an air conditioning unit 2 for adjusting the temperature of the air-conditioning air blown from the blower unit 1 and supplying the air-conditioning air to each part of the passenger compartment, And a control device 3 (shown in FIG. 4). The blower unit 1 and the air conditioning unit 2 are accommodated in an instrument panel (not shown) provided at the front end of the passenger compartment. The air conditioning unit 2 is disposed at a substantially central portion in the left-right direction of the passenger compartment, and the blower unit 1 is disposed on the passenger seat side of the passenger compartment (left side in the case of a right-hand drive vehicle). The blower unit 1 and the air conditioning unit 2 can be configured separately or can be configured integrally. When the blower unit 1 and the air conditioning unit 2 are configured separately, they may be connected by an intermediate duct (not shown).

In the description of this embodiment, for convenience of explanation, the front side of the vehicle is simply referred to as “front”, the rear side of the vehicle is simply referred to as “rear”, the left side of the vehicle is simply referred to as “left”, and the right side of the vehicle is referred to. Simply "right"
Let's say.

(Blower unit configuration)
As shown in FIGS. 2 and 3, the blower unit 1 includes a blower casing 10, an inside / outside air switching damper 20, a blower fan 25, and a fan drive motor 26. As shown in FIG. 2, the blower casing 10 is configured by combining a left member 11 and a right member 12 that are divided into left and right at an intermediate portion in the left and right direction.

  On the upper front side of the blower casing 10, an outside air introduction port 10a for introducing air outside the vehicle compartment (outside air) is formed. The outside air inlet 10a has a shape that is long in the left-right direction. Although not shown, the outside air inlet 10a is connected to an opening formed in a cowl member of the vehicle body and communicates with the outside of the passenger compartment. On the upper rear side of the blower casing 10, an upper inside air inlet 10 b for introducing air (inside air) in the vehicle compartment is formed. The upper inside air introduction port 10 b is formed from the left end to the right end in the upper wall portion of the blower casing 10. The left and right sides of the upper inside air introduction port 10b are also opened in the left and right side walls of the blower casing 10. The upper inside air introduction port 10b opens to the inside of the instrument panel.

  The inside / outside air switching damper (intake damper) 20 is provided in the upper part in the blower casing 10. The inside / outside air switching damper 20 includes a support shaft 21 (shown only in FIG. 2) that is rotatably supported on the side wall portion of the blower casing 10, and an end wall portion 22 that protrudes in the radial direction from the outer surface of the support shaft 21. 3) and a closing plate portion 23 extending in the left-right direction in parallel with the center line of the support shaft 21 from the front end portion of the end wall portion 22 in the protruding direction. The inside / outside air switching damper 20 is driven by the inside / outside air switching actuator (driving means) 24 shown in FIG.

  That is, the inside / outside air switching damper 20 is driven by the inside / outside air switching actuator 24 to have an arbitrary rotation angle. Thereby, the intake mode is switched. The inside / outside air switching actuator 24 is controlled by the control device 3. For example, as shown in FIG. 1, when the inside / outside air switching damper 20 is rotated until the outside air introduction port 10a is fully closed and the inside air introduction port 10b is fully opened, the intake mode becomes the inside air circulation mode. The opening degree of the inside / outside air switching damper 20 at this time is 100%. On the other hand, when the outside air introduction port 10a is fully opened and the inside / outside air switching damper 20 is rotated until the inside air introduction port 10b is fully closed as shown in FIG. 3, the intake mode becomes the outside air introduction mode. At this time, the opening degree of the inside / outside air switching damper 20 is set to 0%.

  When the opening degree of the inside / outside air switching damper 20 is between 1% and 99%, both the outside air introduction port 10a and the inside air introduction port 10b are in an open state, and both the inside air and the outside air are inside the blower casing 10. At the same time, they are mixed and blown as air-conditioning air. The intake mode in which both the inside air and the outside air are simultaneously introduced into the blower casing 10 is the inside / outside air mixing mode. In the inside / outside air mixing mode, the introduction ratio between the inside air and the outside air is changed according to the opening degree of the inside / outside air switching damper 20. Details of the intake mode switching control and a specific description of the inside / outside air mixing mode will be described later.

  As shown in FIG. 2, an air outlet 10 c is formed on the left side wall portion of the blower casing 10. A scroll part 13 is formed in the lower part of the blower casing 10 and the inside of the scroll part 13 communicates with the air outlet 10c. A blower fan 25 is provided inside the scroll unit 13. The blower fan 25 can be constituted by, for example, a centrifugal fan, and is arranged in a posture in which the rotation center line extends in the vertical direction. A fan drive motor 26 is provided on the bottom wall portion of the scroll portion 13 of the blower casing 10. The output shaft of the fan drive motor 26 is provided so as to protrude upward toward the inside of the scroll portion 13. The central portion of the blower fan 25 is fixed to the output shaft of the fan drive motor 26. When the blower fan 25 is driven by the fan drive motor 26, the air for air conditioning is sucked from above the blower fan 25 and discharged into the scroll portion 13. Air-conditioning air discharged into the scroll portion 13 is blown to the air-conditioning unit 2 from an air outlet 10c communicating with a part of the circumferential direction.

  A filter accommodating portion 14 is provided between the upper inside air inlet 10 b in the blower casing 10 and the scroll portion 13. A filter F shown in FIG. 3 is accommodated in the filter accommodating portion 14. The filter F has a plate shape and is disposed in a posture in which the air passage surface extends substantially horizontally. A detachable lid member 15 is attached to the rear side of the filter housing portion 14.

  A bulging portion 16 that bulges to the rear side is integrally provided between the upper inside air inlet 10 b in the blower casing 10 and the filter housing portion 14. The bulging part 16 has a long shape in the left-right direction as a whole. A bulging direction front end wall portion of the bulging portion 16 extends in the vertical direction, and an opening portion 16 a that opens toward the rear side is formed in the front end wall portion so as to communicate with the inside of the blower casing 10. ing. The opening 16a has a substantially rectangular shape that is long in the left-right direction. The left edge of the opening 16a is located near the left side wall of the blower casing 10 and the right edge is located near the right side wall of the blower casing 10. Yes. The lower edge portion of the opening 16 a is located above the filter housing portion 14. Engagement holes 16b are formed in the left and right ends of the bulging portion 16, respectively.

  The bulging portion 16 is configured to be assembled with an inside air introduction portion 30 made of a separate part. The inside air introduction unit 30 is configured to be able to introduce inside air into the blower casing 10 and constitutes a part of the blower casing 10. The inside air introduction portion 30 includes a vertical plate portion 31 that is disposed on the rear side of the opening portion 16a and that is long in the left-right direction, and a peripheral wall portion 32 that protrudes from the peripheral portion of the vertical plate portion 31 to the front side and continues in the circumferential direction. ing. Engagement pieces 33 are formed on the left and right sides of the peripheral wall 32 so as to protrude forward. The engagement piece 33 is engaged with the peripheral edge portion of the engagement hole 16 b in a state where the engagement piece 33 is inserted into the engagement hole 16 b of the blower casing 10.

  A plurality of lower auxiliary inside air introduction ports 31a for opening and closing inside air are formed at an intermediate portion in the vertical direction of the vertical plate portion 31 separately from the inside air introduction port 10b and spaced apart from each other in the left-right direction. The lower auxiliary inside air introduction port 31 a communicates with a space upstream of the filter F in the casing 10. The total opening area of the lower auxiliary inside air introduction port 31a is set smaller than the entire opening area of the lower auxiliary inside air introduction port 31a.

  Each lower auxiliary inside air introduction port 31a has a substantially rectangular shape that is long in the left-right direction. The interval between the lower auxiliary internal air introduction ports 31a adjacent to each other in the left-right direction is set narrow so that the opening area of the lower auxiliary internal air introduction port 31a with respect to the surface area of the vertical plate portion 31 is as large as possible.

  As shown in FIG. 3, a plurality of claw portions 34 projecting into the blower casing 10 are provided in the left-right direction on the surface of the vertical plate portion 31 facing the blower casing 10 (the front surface of the vertical plate portion 31). They are spaced from each other. These claw portions 34 are located above the formation site of the lower auxiliary inside air introduction port 31.

  The inside air introduction unit 30 includes a sub door 40. The sub door 40 is configured to be attached to the inside air introduction portion 30 by inserting and locking the claw portion 34 of the vertical plate portion 31 in a state of being arranged on the front side of the vertical plate portion 31. The sub door 40 is made of a flexible plate-shaped resin material, rubber material, or the like, and is formed in a rectangular shape that is long in the left-right direction as a whole. As a material of the sub door 40, for example, an elastic material is preferable.

  The size of the sub door 40 is set to be smaller than the outer shape of the vertical plate portion 31 and larger than the formation range of the lower auxiliary internal air introduction port 31a, and all of the lower auxiliary internal air introduction ports 31a are disposed on the front side by the sub door 40. That is, it can be closed from the inside of the blower casing 10.

  When the air is not blown or when the blown amount is small, the lower auxiliary inside air introduction port 31a is closed by the sub door 40. On the other hand, for example, when the amount of air flow is large in the outside air introduction mode and the pressure near the sub door 40 in the air blowing casing 10 becomes lower than the pressure outside the air blowing casing 10, a force toward the air blowing casing 10 acts on the sub door 40. Thereby, as shown by a virtual line in FIG. 3, the sub door 40 is bent and deformed, and the lower auxiliary inside air inlet 31a is opened. Thereby, since internal air is introduce | transduced in the ventilation casing 10 from the lower auxiliary | assistant internal air inlet 31a, heating efficiency improves, for example at the time of heating.

  Although not shown, the location where the auxiliary inside air inlet is formed is not limited to the above-described location, and may be the side wall portion of the blower casing 10 or the like. Moreover, the structure of the subdoor 40 is not restricted to the above-mentioned structure, What is necessary is just what was comprised so that it might be opened by the pressure difference inside and outside the ventilation casing 10. FIG.

(Configuration of air conditioning unit)
The air conditioning unit 2 is a unit for adjusting the temperature of the air-conditioning air blown from the blower unit 1. As shown in FIG. 1, the air conditioning unit 2 includes an air conditioning casing 2a. A cooling heat exchanger 50, a heating heat exchanger 51, and an air mix door 52 are disposed inside the air conditioning casing 2a. That is, inside the air conditioning casing 2a, a cold air passage R1 is formed on the upstream side in the air flow direction, and the cooling heat exchanger 50 is accommodated in the cold air passage R1. Further, the downstream side of the cold air passage R1 is branched into a hot air passage R2 and a bypass passage R3, and the heat exchanger 51 for heating is accommodated in the hot air passage R2. The bypass passage R3 is a passage extending by bypassing the hot air passage R2.

  The cooling heat exchanger 50 can be constituted by, for example, a refrigerant evaporator of a heat pump device or the like, but is not limited thereto, and may be anything that can cool air. In addition, the heating heat exchanger 51 can be configured by, for example, a heater core to which engine cooling water is supplied, but is not limited thereto, and can heat air such as an electric heater. It only has to be a thing. An electric heater can be added as an auxiliary heat source.

  The air mix door 52 is disposed between the cooling heat exchanger 50 and the heating heat exchanger 51, and opens and closes the upstream end of the warm air passage R2 and the upstream end of the bypass passage R3. The air mix door 52 can be comprised, for example with a plate-shaped member, and is supported so that rotation with respect to the side wall of the air-conditioning casing 2a is possible. The air mix door 52 is driven by the air mix actuator 52a to have an arbitrary rotation angle. The air mix actuator 52a is controlled by the control device 3.

  When the air mix door 52 fully opens the upstream end of the hot air passage R2 and fully closes the upstream end of the bypass passage R3, the entire amount of the cold air generated in the cold air passage R1 flows into the hot air passage R2 and heats it. Therefore, the warm air flows into the blowing direction switching unit 54 provided on the downstream side in the air flow direction of the air conditioning casing 2a. On the other hand, when the air mix door 52 fully closes the upstream end of the hot air passage R2 and fully opens the upstream end of the bypass passage R3, the entire amount of cold air generated in the cold air passage R1 flows into the bypass passage R3. Cold air flows into the blowing direction switching unit 54. When the air mix door 52 is in a rotational position that opens the upstream end of the hot air passage R2 and the upstream end of the bypass passage R3, the cold air and the hot air are mixed on the downstream side of the air flow direction of the air mix door 52 and then the blowing direction. It will flow into the switching unit 54.

  The amount of cool air and the amount of warm air flowing into the blowing direction switching unit 54 are changed depending on the rotation position of the air mix door 52, and conditioned air having a desired temperature is generated. The air mix door 52 is not limited to the above-described plate-like door, and any configuration may be used as long as it can change the amount of cold air and the amount of hot air. For example, a rotary door or a film door may be used. In addition, the configuration of the temperature adjustment mechanism may not be the above-described configuration, and may be any configuration that can change the amount of cold air and the amount of hot air flowing downstream.

  The blowing direction switching part 54 is a part for supplying the conditioned air whose temperature has been adjusted as described above to each part of the passenger compartment. The blowing direction switching unit 54 includes a defroster outlet 54a, a vent outlet 54b, and a heat outlet 54c. The defroster outlet 54a is connected to a defroster nozzle 55 formed on the instrument panel. The defroster outlet 54a is for supplying conditioned air to the vehicle interior surface of the front window glass (window glass) G. A defroster door 59 for opening and closing the defroster outlet 54a is provided inside the defroster outlet 54a.

  The vent outlet 54b is connected to a vent nozzle 56 formed on the instrument panel. The vent nozzle 56 is mainly for supplying conditioned air to the upper body of the front seat occupant, and is provided at the center in the vehicle width direction of the instrument panel and at both the left and right sides. A vent door 60 for opening and closing the vent outlet 54b is provided inside the vent outlet 54b.

  The heat outlet 54c is connected to a heat duct 57 that extends to the vicinity of the feet of the passenger. The heat duct 57 is for supplying conditioned air to the feet of the passenger. A heat door 61 for opening and closing the heat outlet 54c is provided inside the heat outlet 54c.

  The defroster door 59, the vent door 60, and the heat door 61 are driven by a blowing direction switching actuator 62 to open and close. The blowing direction switching actuator 62 is controlled by the control device 3. The defroster door 59, the vent door 60, and the heat door 61 are linked via a link member (not shown). For example, a defroster mode in which the defroster door 59 is in an open state and the vent door 60 and the heat door 61 are in a closed state. A vent mode in which the defroster door 59 and the heat door 61 are closed and the vent door 60 is opened, a heat mode in which the defroster door 59 and the vent door 60 are closed and the heat door 61 is opened, and the defroster door 59 and the vent door 60 are opened. In the state, the def vent mode in which the heat door 61 is closed, the bi-level mode in which the defroster door 59 and the heat door 61 are in the open state, and the vent door 60 is in the closed state are switched to an arbitrary blow mode. It is done.

  As shown in FIG. 4, the vehicle air conditioner 1 includes an outside air temperature sensor 70, an inside air temperature sensor 71, a solar radiation amount sensor 72, a cooling water temperature sensor 73, an evaporator sensor 74, a front window temperature sensor 75, and a front window vicinity temperature sensor. 76, a front window vicinity humidity sensor 77, an operation switch 78, and a door sensor 79 are provided. These sensors 70 to 77 and 79 are connected to the control device 3 and output signals to the control device 3. The operation switch 78 is also connected to the control device 3 so that the control device 3 can detect the operation state by the occupant.

  The outside air temperature sensor 70 is disposed, for example, at the front or side of the vehicle outside the passenger compartment, and detects the air temperature (outside air temperature) around the vehicle. The inside air temperature sensor 71 is disposed, for example, in the vicinity of the instrument panel in the passenger compartment, and detects the air temperature (inside air temperature) in the passenger compartment. The solar radiation amount sensor 72 is disposed, for example, in the vicinity of an instrument panel in the passenger compartment, and detects the amount of solar radiation irradiated on the passenger compartment.

  The cooling water temperature sensor 73 detects the temperature of the cooling water of the engine mounted on the vehicle, and the cooling water temperature sensor 73 estimates the temperature of the cooling water of the engine flowing into the heating heat exchanger 51. be able to. The evaporator sensor 74 is disposed downstream of the cooling heat exchanger 50 in the air flow direction, and detects the surface temperature of the cooling heat exchanger 50.

  The front window temperature sensor 75 is disposed on the interior surface of the front window glass G, and detects the temperature of the interior surface of the front window glass G. The front window vicinity temperature sensor 76 is disposed in the vicinity of the inner surface of the front window glass G and away from the inner surface of the vehicle interior, and detects the temperature of the front window glass G near the interior surface of the vehicle interior. The front window vicinity humidity sensor 77 is disposed in the vicinity of the inner surface of the front window glass G and away from the inner surface of the vehicle interior, and detects the humidity in the vicinity of the inner surface of the front window glass G.

  The operation switch 78 is disposed, for example, on an instrument panel or the like. For example, an ON / OFF switch for the air conditioner 1, an air volume switch for increasing / decreasing the air flow, a temperature setting switch for setting the temperature of the passenger compartment, It is composed of an inside / outside air switching switch for switching between the inside air circulation, outside air introduction and inside / outside air mixing modes, an auto switch for selecting whether or not to perform auto air conditioner control, a blowing mode switching switch for switching the blowing direction, a defroster switch, and the like.

  The door sensor 79 is a door open / closed state detecting unit that is provided on the vehicle body and detects open / closed states of a front door and a rear door (both not shown) provided on the side of the vehicle. Each of the left front door, the right front door, the left rear door, and the right rear door can be detected to be in an open state or in a closed state, and is turned on when in an open state, It can be constituted by a known door switch or the like that is turned off when in the closed state. The front door and the rear door are pivoted with their front ends supported by the vehicle body via hinges. The door may be a sliding door or a back door provided at the rear of the vehicle.

  The control device 3 is configured by a microcomputer including a central processing unit, a storage device, and the like (not shown), and is configured to operate according to a predetermined program stored in advance in the storage device. That is, the control device 3 controls the inside / outside air switching actuator 24, the air mix actuator 52a, and the blowing direction switching based on the signals (output values) output from the sensors 70 to 77 and 79 and the operation state of the operation switch 78. The actuator 62 and the fan drive motor 26 are controlled.

  Specifically, when the automatic air conditioner control is selected by the auto switch of the operation switch 78, the temperature outside the passenger compartment, the temperature inside the passenger compartment, the amount of solar radiation, the engine coolant temperature, the surface temperature of the cooling heat exchanger 50. The target air temperature of the conditioned air supplied to the passenger compartment is determined based on the indoor set temperature by the occupant, and the opening degree of the air mix door 52 is calculated so as to be the target air temperature. The air mix door 52 is rotated by controlling the air mix actuator 52a so that the opening becomes the opening. Thereby, the temperature of the conditioned air becomes the target blowing temperature.

  Further, the control device 3 controls the blowing direction switching actuator 62 so that the blowing mode is mainly the vent mode during cooling, and controls the blowing direction switching actuator 62 so that the blowing mode is mainly set to the heat mode during heating. . In the case of weakness even during cooling or heating, the blowing direction switching actuator 62 is controlled so as to enter the bi-level mode or the defvent mode. Further, when the defroster switch included in the operation switch 78 is turned on, the blowing direction switching actuator 62 is controlled so that the blowing mode becomes the defroster mode.

  For example, when heating is performed with a vehicle that has been left for a long time in winter, or when cooling is performed with a vehicle that has been left for a long time in summer, the difference between the target blowing temperature and the inside air temperature becomes large. In such a case, the control device 3 controls the fan drive motor 26 so as to increase the air volume, but the occupant can also operate the air volume selector switch to obtain the desired air volume. In the automatic air conditioner control, the fan drive motor 26 is controlled so that the air volume decreases as the difference between the target blowing temperature and the inside air temperature decreases. The control of the fan drive motor 26 is performed by changing the applied voltage. However, the present invention is not limited to this, and any method that can change the rotation speed of the fan drive motor 26b may be used.

  The amount of air blown to the upper body of the occupant can be detected by the control of the fan drive motor 26 by the control device 3 and the switching control of the blowing mode. That is, when the blowing mode is the vent mode, the conditioned air is mainly blown to the upper body of the occupant, and the upper body of the occupant is detected by detecting the voltage applied to the fan drive motor 26 in the vent mode. The amount of air blown to can be detected. Further, in the heat mode, the amount of air blown to the occupant's upper body as a whole is smaller than in the vent mode, and this can also be detected by the control device 3.

  Further, the control device 3 controls the inside / outside air switching actuator 24 according to the procedure of the flowchart shown in FIG. The control of the inside / outside air switching actuator 24 is performed at a predetermined timing when the ignition switch of the vehicle is ON and the air conditioner 1 for the vehicle is turned ON and the control device 3 determines that heating is necessary. It has been repeated. During cooling, the inside / outside air switching actuator 24 is basically controlled so as to be in a mode selected by the occupant (outside air introduction mode or inside air circulation mode).

  In Step SA1 after the start, the output values of the sensors 70 to 77 and 79 are read and the operation state of the operation switch 78 is read. In step SA2 following step SA1, the dew point temperature is calculated. The dew point temperature is the temperature near the vehicle interior surface of the front window glass G output from the front window vicinity temperature sensor 76 and the humidity near the vehicle interior surface of the front window glass G output from the front window vicinity humidity sensor 77. Obtained on the basis.

  In step SA3, a target dew point temperature is calculated. The target dew point temperature is set to a temperature lower than the temperature of the vehicle interior surface of the front window glass G output from the front window temperature sensor 75. For example, when the temperature of the vehicle interior surface of the front window glass G is 10 ° C., a temperature lower by about 2 to 3 ° C. is set as the target dew point temperature. The dew point temperature and the target dew point temperature can be obtained according to a known method.

  In step SA4, intake control is performed. Specifically, as shown in the flowchart shown in FIG. 6, in step SB <b> 1, it is determined whether or not the automatic control is performed, that is, whether the automatic air conditioner control or the manual operation by the passenger is selected. Whether or not the auto air conditioner control is performed can be determined by whether or not the auto switch among the operation switches 78 is pressed. If NO is determined in step SB1 and the manual operation is selected instead of the automatic air conditioner control, the process proceeds to step SB2, and it is determined whether or not the intake mode is the outside air introduction mode. Since the inside / outside air mixing mode cannot be selected by manual operation, it is determined in step SB2 which mode is the outside air introduction mode or the inside air circulation mode.

  If it is determined as YES in step SB2 and it is in the outside air introduction mode, it means that the occupant has positively selected the outside air introduction mode, so that the routine proceeds to step SB3 and the target opening degree of the inside / outside air switching damper 20 is reached. Is the outside air opening. The outside air introduction opening is an opening that fully opens the outside air introduction port 10a and fully closes the inside air introduction port 10b, and is 0%. On the other hand, if it is determined as NO in step SB2 and is in the inside air circulation mode, it means that the occupant has positively selected the inside air circulation mode, and therefore the process proceeds to step SB4, where the inside / outside air switching damper 20 The target opening is the inside air circulation opening. The inside air circulation opening is an opening that fully closes the outside air inlet 10a and fully opens the inside air inlet 10b, and is 100%.

  If YES is determined in step SB1 and the air conditioner control is performed, the process proceeds to step SB5. In step SB5, the target opening degree (f) of the inside / outside air switching damper 20 is calculated so that the dew point temperature calculated in step SA2 of the flowchart shown in FIG. 5 becomes the target dew point temperature calculated in step SA3. For example, when the dew point temperature is higher than the target dew point temperature, the target opening degree (f) of the inside / outside air switching damper 20 is calculated so as to increase the outside air introduction amount, and when the dew point temperature is lower than the target dew point temperature. Then, the target opening degree (f) of the inside / outside air switching damper 20 is calculated so as to increase the inside air circulation amount. When the dew point temperature is higher than the target dew point temperature, the outside air introduction amount is increased as the difference becomes larger, and when the dew point temperature is lower than the target dew point temperature, the inside air circulation amount is increased as the difference becomes larger. That is, the control device 3 detects the easiness of fogging of the front window glass G. Basically, when the front window glass G is easily fogged based on the detection result, the outside air introduction amount is increased while the front window glass G is increased. When G is hardly cloudy, the inside air circulation amount is increased. Thus, in the automatic air conditioner control, basically, the inside / outside air mixing mode in which the outside air introduction amount and the inside air circulation amount are changed based on the ease of fogging of the front window glass G is selected.

  After calculating the target opening degree (f) of the inside / outside air switching damper 20 in step SB5, the process proceeds to step SB6 to determine whether any one of the plurality of doors of the vehicle is open. This is performed based on the output of the door sensor 79. If it is determined NO in step SB6, all the doors of the vehicle are closed. In this case, the process proceeds to step SB7, and the target opening degree (f) of the inside / outside air switching damper 20 calculated in step SB5 is output. In step SA5 of the flowchart shown in FIG. 5, the driving process of the inside / outside air switching actuator 24 is performed so that the target opening degree (f) of the inside / outside air switching damper 20 calculated in step SB5 is obtained. Specifically, a control signal is output to the inside / outside air switching actuator 24 so that the inside / outside air switching damper 20 rotates until the target opening degree (f) is reached. As a result, the inside / outside air switching damper 20 reaches the target opening degree (f), and the inside air and the outside air are introduced simultaneously.

  If it is determined as YES in step SB6 of the flowchart shown in FIG. 6 and the vehicle door is open, the process proceeds to step SB8 where the target opening of the inside / outside air switching damper 20 is set to the outside air introduction opening (0%). To do. Since all the doors of the vehicle are closed during normal traveling, the process does not proceed to step SB8 during traveling, but at least one door is opened when, for example, an occupant gets on and off, or loads and unloads luggage. It will be in a state and will progress to step SB8.

  Then, the driving process of the inside / outside air switching actuator 24 is performed so that the outside air opening degree is reached in step SA5 of the flowchart shown in FIG. As a result, the inside / outside air switching damper 20 enters the outside air introduction mode.

  That is, when the inside / outside air mixing mode is selected in step SB1, if it is detected in step SB6 that the door is in the open state, the outside air introduction port is set in step SB8 more than when the door is in the closed state. The opening degree of 10a is set large, and the outside air inlet opening degree increase control for controlling the inside / outside air switching actuator 24 so as to be the opening degree is performed in step SA5.

  The opening degree of the air mix door 18 is determined as described above. Further, the blowing mode and the air volume (voltage applied to the fan drive motor 26) are also determined based on a known control method.

(Effect of embodiment)
As described above, according to the vehicle air conditioner 100 according to this embodiment, the lower auxiliary internal air introduction port 31a is provided in the blower casing 10 of the blower unit 1 and the lower auxiliary internal air introduction port 31a is made of a flexible member. Since the sub door 40 is openable and closable, when the outside air is introduced, the sub door 40 is bent and deformed so as to open the lower auxiliary inside air introduction port 31a due to the negative pressure in the air blowing casing 10, whereby a part of the inside air is also generated in the air blowing casing 10. Introduced to improve heating efficiency. In addition, when the inside / outside air mixing mode is selected, the outside air introduction amount and the inside air circulation amount are changed based on the ease of fogging of the front window glass G. This makes it possible to increase the amount of ventilation, thereby reducing the amount of energy required for heating. In particular, a plate-like sub door 40 extending in the vertical direction is used, and its upper end is attached to the air blowing casing 10 and its lower end is a free end. Therefore, when the outside air is introduced, the lower end of the sub door 40 is lowered by the negative pressure in the air blowing casing 10. The auxiliary inside air introduction port 31a is easily displaced in the opening direction, and thereby the lower auxiliary inside air introduction port 31a can be reliably opened.

  In addition, as shown in FIG. 6, when the automatic control is performed in step SB1, the inside / outside air mixing mode is selected, and at this time, it is detected in step SB6 that the door of the vehicle is open. Then, the opening degree of the outside air introduction port 10a is set larger than that when the door is in the closed state, and the inside / outside air switching damper 20 is operated so as to be the set opening degree. As a result, the interior of the vehicle interior and the exterior of the vehicle interior communicate with each other via the defroster air outlet 54a, the vent air outlet 54b, the heat air outlet 54c, and the outside air introduction port 10a, so that the air in the vehicle interior can be easily moved outside the vehicle interior. become. Therefore, after that, when the door is closed, the air in the passenger compartment easily escapes to the outside of the passenger compartment through the defroster outlet 54a, the vent outlet 54b, the heat outlet 54c, and the outside air inlet 10a. A sudden pressure increase in the room, that is, an instantaneous pressure fluctuation in the vehicle interior is reduced. Therefore, the flapping sound of the sub door 40 is suppressed.

  The control shown in FIGS. 5 and 6 is repeated at a predetermined timing. For example, when the vehicle door is closed after step SB6 to step SB8, NO is determined in step SB6 in the subsequent flow. Therefore, the process proceeds to step SB7, and the outside air inlet opening degree increase control is prohibited. In actual air conditioning control, there is a slight delay until the control signal is transmitted to the inside / outside air switching actuator 24 and the movement starts, and the driving force of the inside / outside air switching actuator 24 is exchanged via the link member or the like. Since there is a slight delay before the signal is transmitted to 20, the opening degree of the outside air introduction port 10a is still large at the moment when the opened door is closed. Therefore, a sudden pressure increase in the passenger compartment at the moment when the door is closed is reduced.

  Further, since the outside air introduction port 10a is fully opened when the vehicle door is in the open state, the air in the vehicle compartment easily escapes from the outside air introduction port 10a when the door is in the closed state, and the subdoor 40 The suppression effect of fluttering sound is further enhanced. Note that when the outside air inlet opening degree increase control is performed, the outside air inlet 10a does not need to be fully opened, and is preferably, for example, an opening degree of 10% or less.

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the vehicle air conditioner according to the present invention can be used, for example, when air-conditioning the interior of a vehicle.

DESCRIPTION OF SYMBOLS 10 Blower casing 10a Outside air introduction port 10b Inside air introduction port 20 Inside / outside air switching damper 24 Inside / outside air switching actuator (drive means)
31a Lower auxiliary inside air inlet 40 Sub door 79 Door sensor (door open / closed state detecting means)

Claims (3)

A blower casing formed with an inside air introduction port and an auxiliary inside air introduction port that introduces air inside the vehicle compartment and circulates it into the vehicle compartment, and an outside air introduction port that introduces air outside the vehicle compartment;
An inside / outside air switching damper that is provided in the blower casing and opens and closes the inside air inlet and the outside air inlet;
Driving means for driving the inside / outside air switching damper;
A sub door made of a flexible member provided in the blower casing and opening and closing the auxiliary inside air inlet;
A control device for controlling the driving means,
The control device detects the easiness of fogging of the window glass of the vehicle, and if the window glass is likely to be fogged based on the detection result, the driving means to operate the inside / outside air switching damper in a direction in which the outside air introduction amount increases. On the other hand, when the window glass is difficult to fog, the vehicle air conditioner is configured to be able to select the inside / outside air mixing mode for controlling the driving means to operate the inside / outside air switching damper in the direction in which the inside air circulation amount increases. In the device
The vehicle air conditioner includes a door open / close state detecting means for detecting an open / close state of a door provided in the vehicle,
When the door open / closed state detecting means detects that the door is in an open state when the inside / outside air mixing mode is selected, the control device is more effective than when the door is in a closed state. The outside air inlet opening degree increasing control for controlling the driving means is performed so that the opening degree of the outside air inlet opening is increased, while the door open / closed state detecting means detects that the door is closed. In this case, the vehicle air conditioner prohibits the outside air inlet opening degree increase control. In the vehicle air conditioner according to claim 1,
The vehicle air conditioner is characterized in that the control device is configured to fully open the outside air inlet when the outside air inlet opening degree increase control is performed. The vehicle air conditioner according to claim 1 or 2,
The vehicular air conditioner characterized in that the sub door is formed in a plate shape extending in the vertical direction, an upper end portion is attached to the auxiliary inside air introduction port in the blower casing, and a lower end portion is a free end.

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