JPH11348528A - Air conditioner for automobile, and its control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the rapid fluctuation of the suction pressure of a blower in switching an inlet by providing a second damper separate from an inlet switching damper to open/close an outside air inlet on the outside air inlet. SOLUTION: An outside air inlet 3 and an inside air inlet 4 are provided on an air inlet part of a vent duct 2, and an inlet switching damper 5 is provided between the inlets 3, 4. In addition, a second damper 10 separate from the inlet switching damper 5 is provided on the outside air inlet 3, the second damper 10 is independently operable from the inlet switching damper 5, the second damper 10 comprises two dampers 11, 12, and the outside air inlet 3 is opened/closed by turning the dampers 11, 12. The rapid fluctuation of the suction pressure of a blower 6 in switching the inlets can be prevented, generation of an abnormal noise is suppressed, and the noise level is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle having a suction port switching damper capable of switching between suction ports by swinging between inside and outside air suction ports, and a control method thereof.

[0002]

2. Description of the Related Art Conventionally, there is known an air conditioner for an automobile provided with an intake port switching damper capable of switching an intake port by swinging between an inside air intake port and an outside air intake port. Is configured as shown in FIGS. 5 and 6, for example. In the figure, reference numeral 51 denotes an inside air intake port, and 52 denotes an outside air intake port. A swingable inlet switching damper 53 is provided between the inside air inlet 51 and the outside air inlet 52. By swinging the suction port switching damper 53 in the direction of the arrow in FIG. 6, the inside air suction port 51 and the outside air suction port 52 are opened and closed. Further, the air sucked from one of the suction ports is sent to a blower (not shown), and further sent to a downstream heat exchanger (for example, an evaporator and / or a heater core). I have.

[0003]

However, since the ram pressure is applied to the outside air inlet 52 of the vehicle air conditioner according to the running speed of the vehicle, both the inlets 5
There is a difference between the suction pressures 1, 52. Therefore, in this state, if the suction port switching damper 53 swings between the two suction ports 51 and 52, the suction pressure of the blower may fluctuate rapidly and abnormal noise may be generated. Further, when the suction port switching damper 53 swings toward the outside air suction port 52, a large load may be applied to the damper 53 and smooth swing may be hindered.

An object of the present invention is to prevent a sudden change in the suction pressure of a blower when switching the suction port,
An object of the present invention is to provide an air conditioner for a vehicle capable of suppressing generation of abnormal noise, reducing a load on a suction port switching damper and the like, and capable of smoothly switching suction ports with low noise and a control method thereof.

[0005]

In order to solve the above-mentioned problems, an air conditioner for a vehicle according to the present invention comprises an inside air intake port and an outside air intake port, and a switching port provided between the two intake ports so as to be swingable. An automotive air conditioner having a damper, wherein a second damper, which is different from the suction port switching damper for opening and closing the outside air suction port, is provided at the outside air suction port.

It is preferable that the second damper is configured to be able to operate independently of the suction-port switching damper.

In order to solve the above-mentioned problems, a method for controlling an air conditioner for a vehicle according to the present invention includes the steps of: When switching to the suction port, the second
After closing the outside air suction port by the damper, the suction port switching damper is swung to open the inside air suction port.

According to another aspect of the present invention, there is provided a method for controlling an air conditioner for a vehicle, comprising the steps of: controlling a vehicle air conditioner provided with the second damper; When switching from the inside air intake port to the outside air intake port, the outside air intake port is opened by the second damper after rocking the intake port switching damper to close the inside air intake port. Consists of

In the automotive air conditioner described above, since the second damper is provided at the outside air intake port,
It is possible to prevent a sudden change in the suction pressure of the blower when switching the suction port. In other words, when controlling the automotive air conditioner having the second damper as described above, when the suction port is switched from the outside air suction port to the inside air suction port, the outside air suction port is first closed by the second damper. Then, the suction port switching damper is swung toward the outside air suction port to open the inside air suction port. On the other hand, when switching the suction port from the inside air suction port to the outside air suction port, the suction port switching damper is first swung toward the inside air suction port to close the inside air suction port, and then the second air damper is used to suck the outside air. Open mouth.

Therefore, at the time of switching the suction port, one of the suction ports is closed and then the other suction port is opened. Therefore, when the ram pressure of the outside air suction port is increased in the conventional apparatus, the suction port is switched. The sudden fluctuation of the suction pressure of the blower caused by the swing of the damper and the opening of both suction ports is prevented,
Generation of abnormal noise is suppressed. In particular, when the suction port switching damper swings from the inside air suction port side to the outside air suction port side,
That is, when the suction port is switched from the outside air suction port to the inside air suction port, the load on the swinging suction port switching damper is reduced because the second damper is closed, so that the suction port switching can be performed quickly and smoothly. Is achieved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show an automotive air conditioner according to one embodiment of the present invention. In the figure, 1 indicates an air conditioner for a vehicle, and 2 indicates a ventilation duct thereof. An outside air inlet 3 and an inside air inlet 4 are provided at an air inlet of the duct 2. A suction port switching damper 5 is provided between the suction ports 3 and 4, and the switching of the suction port is performed by the swing of the suction port switching damper 5.

The air sucked from the outside air suction port 3 or the inside air suction port 4 is pressure-fed to the downstream side of the duct 2 by the blower 6.

On the downstream side of the blower 6 in the duct 2, an evaporator 7 and a heater core 8 are provided in this order. Also,
An air mix damper 9 is provided between the evaporator 7 and the heater core 8 to adjust a ratio of an air volume between the air passing through the heater core 8 and the air bypassing the heater core 8.

The outside air inlet 3 has a second damper 10
Is provided. The second damper 10 can operate independently of the suction-port switching damper 5. In the present embodiment, the second damper 10 includes two dampers 11, 1
The outside air suction port 3 is opened and closed by the rotation of the dampers 11 and 12.

In the vehicle air conditioner 1 of this embodiment, the air taken into the duct 2 from the outside air inlet 3 or the inside air inlet 4 is heat-exchanged by the evaporator 7 and / or the heater 8, One or a plurality of outlets selected from the DEF outlet 13, the VENT outlet 14, and the FOOT outlet 15 are blown into the vehicle interior.

In the above-described vehicle air conditioner 1, the control method of the vehicle air conditioner of the present invention is implemented as follows. For example, if the inlet is outside air inlet 3
In the case of switching from to the inside air intake port 4, the following control is performed. In this initial state, the suction port switching damper 5 is swung toward the inside air suction port 4 and
Is closed. Further, since the outside air inlet 3 is opened by the second damper 10 and the outside air is sucked from the outside air inlet 3 (FIG. 4), first, the second damper 10 is opened.
Of the outside air inlet 3 by rotating the dampers 11 and 12
Is closed. Then, the outside air inlet 3 is connected to the second damper 10.
Then, the suction port switching damper 5 is swung toward the outside air suction port 3 to open the inside air suction port 4.

On the other hand, when the suction port is switched from the inside air suction port 4 to the outside air suction port 3, the following control is performed. In this case, in the initial state, the outside air inlet 3 is
While being closed by the second damper 10, the suction port switching damper 5 is swung toward the outside air suction port 3 and the inside air suction port 4 is closed.
Is opened, and the inside air is sucked into the duct 2 from the inside air suction port 4.
Is swung toward the inside air suction port 4 to close the inside air suction port 4. Then, after closing the inside air suction port 4 with the suction port switching damper 5, the second damper 10 is rotated to open the outside air suction port 3.

Therefore, in the control method of the automotive air conditioner according to the present invention, when switching the suction port, one of the suction ports is completely closed and then the other is opened. The swing of the switching damper 5 eliminates the inconvenience that air is simultaneously sucked from the two suction ports 3 and 4 having different suction pressures and the blower suction pressure fluctuates rapidly.

In particular, when the suction port switching damper 5 swings from the inside air suction port 4 to the outside air suction port 3, since the outside air suction port 3 is closed by the second damper 10, the suction port switching damper 5 is closed. The load on the switching damper 5 is reduced, and smooth and quick swing is ensured.

As is clear from the above description,
In the control method of the automotive air conditioner of the present invention, the swing of the inlet switching damper 5 and the rotation of the second damper 10 do not interfere with each other in any case of the switching.

[0021]

As described above, according to the automotive air conditioner and its control method of the present invention, it is possible to prevent a sudden change in the suction pressure of the blower when switching the suction port, so that abnormal noise is generated. Occurrence is suppressed and noise can be reduced. In addition, since the load on the suction port switching damper and the like is reduced, the switching of the suction port can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner for a vehicle according to an embodiment of the present invention.

FIG. 2 shows the suction port of the apparatus shown in FIG. 1 (second damper closed state).
FIG.

FIG. 3 shows the suction port of the apparatus shown in FIG. 1 (second damper open state).
FIG.

FIG. 4 is a cross-sectional view of the suction port of FIG.

FIG. 5 is a transparent perspective view of a suction port of a conventional automotive air conditioner.

FIG. 6 is a cross-sectional view of the suction port of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automotive air conditioner 2 Duct 3 Outside air suction port 4 Inside air suction port 5 Suction port switching damper 6 Blower 7 Evaporator 8 Heater core 9 Air mix damper 10 Second damper 11, 12 Damper 13 DEF blowout port 14 VENT blowout port 15 FOOT Outlet

Claims (4)

[Claims] 1. An automotive air conditioner having an inside air intake port and an outside air intake port, and an intake port switching damper swingably provided between the two intake ports, wherein the outside air intake port is connected to the outside air intake port. A second valve separate from the suction-port switching damper that opens and closes;
An air conditioner for a vehicle, comprising: 2. The vehicle air conditioner according to claim 1, wherein the second damper is configured to be able to operate independently of the suction-port switching damper. 3. The second damper according to claim 1, wherein when controlling the automotive air conditioner provided with the second damper according to claim 1 or 2, the suction port is switched from an outside air suction port to an inside air suction port. A method for controlling an air conditioner for a vehicle, characterized in that after closing the outside air suction port, the suction port switching damper is swung to open the inside air suction port. 4. An intake air switching damper for controlling an automotive air conditioner provided with the second damper according to claim 1 or 2, wherein the air intake is switched from an inside air intake to an outside air intake. Swinging the inner air intake port to close the interior air intake port, and then opening the external air intake port by the second damper.