KR20200011729A - Air conditioning system for automotive vehicles - Google Patents

Abstract

The present invention relates to an air conditioning device for a vehicle, wherein a noise reduction device which reduces air conditioning noise is controlled while considering all of the air discharge volume and the air discharge mode state of a blower, thereby effectively dealing with the air conditioning noise which is changed corresponding to the air discharge volume and the air discharge mode state of the blower. Resultantly, the air conditioning noise which is infiltrated into a vehicle compartment can be efficiently reduced regardless of the air discharge volume and the air discharge mode of the blower. To this end, the present invention comprises a noise reduction device which can reduce air conditioning noise. Here, the noise reduction device comprises: a noise microphone which can acquire air conditioning noise; and a speaker which reduces the air conditioning noise by outputting a noise reduction sound wave based on the air conditioning noise acquired by the noise microphone. In addition, the air conditioning device for a vehicle further comprises: an air flow information detection unit which can detect information of an air flow moving along an inner flow path of an air conditioning case; and a control unit which controls the speaker considering the air flow information of the air flow information detection unit and the air conditioning noise acquired by the noise microphone.

Description

Automotive air conditioning unit {AIR CONDITIONING SYSTEM FOR AUTOMOTIVE VEHICLES}

The present invention relates to a vehicle air conditioner, and more particularly, by controlling the noise reduction device for reducing the air conditioning noise, by controlling in consideration of both the air discharge air volume and the air discharge mode of the blower, It is possible to effectively respond to the air conditioning noise changes according to the air discharge mode state, and through this, it is related to the air conditioning apparatus that can efficiently reduce the air conditioning noise introduced into the cabin irrespective of the air discharge air volume and the air discharge mode of the blower .

Noise is the biggest cause of the deterioration of the vehicle's riding comfort. There are various kinds of vehicle noises, and among them, there are noises of air conditioners.

Noise of the air conditioning apparatus (hereinafter, abbreviated as "air conditioning noise") includes vibration and noise generated from an air conditioner compressor, vibration and noise generated from a high-pressure refrigerant pipe, and vibration and noise generated from a blower of the air conditioning case. Such vibrations and noises significantly reduce the ride comfort of the vehicle when it is transmitted into the cabin.

In particular, the noise of the blower occupies most of the air conditioning noise, and when the noise of the blower flows into the cabin, severe stress is placed on the passengers in the cabin. As a result, not only the ride comfort of the vehicle is lowered, but also the fatigue is given to the driver, which causes a lot of obstacles for safe driving.

Therefore, the noise of the blower must necessarily be reduced in order to improve the riding comfort and the driver's safe driving.

As a method of reducing the noise of the blower, there is an ANC (Active Noise Control) device, which is a noise reduction device that outputs sound waves having a waveform opposite to that of the blower to the speaker and cancels the noise of the blower.

This technique, as shown in Figure 1, the microphone 3 and the speaker 5 is installed in the air conditioner case 1, the noise of the blower (7) through the microphone 3, and then obtained Sound waves of a waveform opposite to that of one noise are output to the speaker 5. Therefore, the noise of the blower 7 is canceled and the noise of the blower 7 is reduced.

By the way, such a conventional ANC apparatus has the "air discharge" of the blower 7 in spite of the different air-conditioning noises introduced into the cabin according to the "air discharge wind amount" and "air discharge mode" states of the blower 7. There is a disadvantage in that the speaker 5 is controlled only by the noise of the blower 7 input through the microphone 5 without considering the air conditioning noise depending on the "air volume" and the "air discharge mode". Has a disadvantage of low efficiency.

In particular, the "air flow path" differs according to the "air discharge mode", and the air conditioning noise generated according to the "air flow path" is also different, and the same "air flow path" also depends on the "air discharge wind volume" of the blower 7. Although the degree of air conditioning noise is different, there is a disadvantage in that the speaker 5 is controlled only by the noise of the blower 7 detected by the microphone 5, and as a result, the reduction efficiency of the air conditioning noise is low. There is a problem.

The present invention has been made to solve the above conventional problems, the object is to control the speaker in consideration of both the air discharge air volume and the air discharge mode state of the blower, the air discharge air amount and air discharge mode state of the blower To provide a vehicle air conditioning apparatus that can respond to the air conditioning noise changes according to.

Another object of the present invention is configured to cope with the air discharge air volume of the blower and the air conditioning noise changes according to the air discharge mode state, the air conditioning noise introduced into the cabin irrespective of the air discharge air volume and air discharge mode of the blower It is to provide a vehicle air conditioner that can be efficiently reduced.

In order to achieve this object, the vehicle air conditioner according to the present invention includes an ANC device that can reduce the air conditioning noise, the ANC device is a noise microphone that can obtain the air conditioning noise, and obtained from the noise microphone An air conditioner for a vehicle, comprising: a speaker for reducing air conditioning noise by outputting noise reduction sound waves based on air conditioning noise, the vehicle air conditioner comprising: an air flow information sensing unit capable of sensing air flow information flowing along an internal flow path of an air conditioning case; And a controller for controlling the speaker in consideration of air flow information of the air flow information detection unit and air conditioning noise obtained from the noise microphone.

Preferably, the controller is characterized in that for controlling the speaker by filtering the control value of the speaker for the air conditioning noise obtained by the noise microphone, according to the air flow information of the air flow information detection unit.

And the air flow information detecting unit detects air discharge wind amount information and air discharge mode information of the blower; The control unit has built-in filter values for each air discharge air volume and air discharge mode of the blower, and includes filter values corresponding to the air discharge air volume information and the air discharge mode information of the blower inputted from the air flow information detection unit. Filtering the control value of the speaker.

And the air flow information detecting unit includes one or more vent side microphones installed at one or more air discharge vents of the air discharge vents of the air conditioning case to obtain air flow sounds discharged from the air discharge vents; The control unit may determine whether the airflow sound of the vent microphone is acquired to determine the current air discharge mode state, and compare the obtained airflow sound volume with a preset value to determine the air discharge air volume of the blower. It is characterized by.

According to the vehicle air conditioner according to the present invention, the air discharge vent air flow sound through the vent side microphone of the air discharge vent, and the air discharge air volume and the air discharge mode of the blower through the obtained air discharge vent air flow sound It is possible to control the ANC device based on the state of the blower and the air discharge mode of the blower.

In addition, since the ANC device can be controlled based on the blower air discharge amount and the air discharge mode state, the ANC device can be controlled in consideration of both the blower air discharge amount and the air discharge mode state. There is an effect that can actively respond to the air conditioning noise changes according to the discharge air volume and the air discharge mode state.

In addition, it is possible to actively respond to the air discharge air volume of the blower and the air conditioning noise that changes according to the air discharge mode state, thereby effectively reducing the air conditioning noise introduced into the cabin irrespective of the blower air discharge air volume and air discharge mode. It has an effect.

In addition, since the air discharge vent side air flow sound is acquired through the vent side microphone of the air discharge vent, and the air discharge wind volume and the air discharge mode state of the blower are grasped through the acquired air discharge vent side air flow sound. The HVAC itself can be used to operate the ANC device by grasping the blower's air discharge air volume and air discharge mode information without being linked to an air conditioning control controller installed in the air conditioner.

In addition, the HNC itself can drive the ANC device by grasping the air discharge air volume information and the air discharge mode information of the blower, and thus regardless of the vehicle type, unlike the structure connected with the air conditioning control controller of the vehicle. There is an effect that can operate the ANC unit of the HVAC.

In addition, it is possible to operate the ANC device of the air conditioning apparatus (HVAC) irrespective of the vehicle model, it is possible to increase the share rate of the components, as a result, there is an advantage that it is very useful for selling and exporting the single unit of the air conditioning apparatus (HVAC).

1 is a view showing an ANC device installed in a conventional vehicle air conditioner,
2 is a view showing a first embodiment of a vehicle air conditioner according to the present invention;
3 is a side cross-sectional view of FIG. 2 showing a first embodiment of a vehicle air conditioner according to the present invention;
4 is a flowchart showing an operation example of the first embodiment of the vehicle air conditioner according to the present invention;
5 is a view showing a second embodiment of a vehicle air conditioner according to the present invention;
FIG. 6 is a side cross-sectional view of FIG. 5, showing a second embodiment of a vehicle air conditioner according to the present invention.

Hereinafter, a preferred embodiment of a vehicle air conditioner according to the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]

First, prior to looking at the features of the vehicle air conditioner according to the present invention, a brief description of the vehicle air conditioner with reference to FIGS.

The vehicle air conditioner includes an air conditioner case 10, and the air conditioner case 10 is provided with a blower 12, an evaporator 14, a heater core 16, and a mode door 18.

The blower 12 sucks internal and external air and blows it into the internal flow path 10a of the air conditioning case 10, and the evaporator 14 cools the air blown into the internal flow path 10a, and the heater core 16 The air blown into the internal passage 10a is heated.

The mode doors 18 are installed in each air discharge vent 19 of the air conditioning case 10, and are provided with a def door 18a installed in the defrost vent 19a, Vent doors 18b installed in the face vent 19b and floor doors 18c installed in the floor vent 19c, these modes The doors 18 control the discharge direction of the air while being organically controlled with each other according to the "air discharge mode".

In particular, the mode doors 18 adjust the discharge direction of the air to the passenger's face in the vent mode and the discharge direction of the air in the bi-level mode. Orientation and floor surface in the cabin. In Mix Mode, the discharge direction of air is adjusted to the window glass and the floor in the cabin.

In the deep mode, the discharge direction of the air is adjusted to the window glass side, and in the floor mode, the discharge direction of the air is adjusted to the floor surface of the vehicle interior.

And the air conditioning apparatus is equipped with the ANC apparatus 20 which is a noise reduction apparatus which can reduce air conditioning noise. The ANC device 20 includes a noise microphone 22 and a speaker 24 provided on the internal passage 10a of the air conditioning case 10.

The noise microphone 22 is installed on the blower 12 side to acquire the noise of the blower 12, and the speaker 24 combines the air passed through the evaporator 14 and the air passed through the heater core 16 together. Is installed in the air mixing area (A).

The ANC device 20 acquires the noise of the blower 12 through the noise microphone 22, and then outputs sound waves having a waveform opposite to the obtained noise to the speaker 24 to output the noise of the blower 12. Offset.

Next, the features of the vehicle air conditioner according to the present invention will be described in detail with reference to FIGS. 2 and 3.

First, the air conditioning apparatus of the present invention can detect the air flow information flowing along the internal flow path 10a of the air conditioning case 10, in particular, the air discharge wind volume information and the air discharge mode information of the blower 12. It includes an air flow information detector 30.

The air flow information detecting unit 30 includes one or more vent-side microphones 32 installed on one or more air discharge vents 19 of each air discharge vents 19.

It is preferable that the vent side microphone 32 is provided in each air discharge vent 19. In particular, it is preferable that both the defrost vent 19a, the face vent 19b, and the floor vent 19c are provided.

These vent-side microphones 32 are configured to obtain airflow sounds discharged through each air discharge vent 19.

In particular, the "diff vent side air flow sound" discharged through the defrost vent 19a, the "face vent side air flow sound" discharged through the face vent 19b, and the floor vent 19c are discharged through the floor vent 19c. And “floor vent side airflow noise”.

Therefore, through the acquired air flow sound of each air discharge vent 19, it is possible to detect the air discharge wind amount information and the air discharge mode information of the blower 12.

2 and 3 again, the air conditioner of the present invention includes a control unit 40.

The control unit 40 is equipped with a microprocessor, and when the air flow information of each air discharge vent 19 is input from the air flow information detection unit 30, that is, the air flow sound of each air discharge vent 19 side. When this is input, the input air flow sound is processed to determine the air discharge wind amount and the air discharge mode of the blower 12.

In particular, it is determined whether the air flow sounds of the vent-side microphones 32 are acquired to determine the current air discharge mode state, and the amount of air discharge air of the blower 12 is compared with a preset value of the acquired air flow sounds. It is configured to grasp.

For example, as shown in Table 1 below, when it is determined that the air flow sound is obtained only in the face vent 19b side microphone 32 among the vent side microphones 32, the current air discharge mode is obtained. If it is determined that the "vent mode", and the air flow sound is obtained only from the microphone 32 of the defrost vent (19a), it is determined that the current air discharge mode is "diff mode", defrost vent If it is determined that the air flow sound is obtained at the microphone 19 on the side of the microphone 19 and the floor vent 19c on the side of the microphone 32, it is determined that the current air discharge mode is the "mix mode".

When it is determined that the air flow sound is obtained in the face vent 19b side microphone 32 and the floor vent 19c side microphone 32, it is determined that the current air discharge mode is the "bi level mode". If it is determined that the air flow sound is obtained only in the microphone 32 on the floor vent 19c side, it is determined that the current air discharge mode is "floor mode".

Determination of Air Discharge Mode by Air Flow of Vent Microphones Air flow Face vent microphone ○ ○ Deep
Vent side microphone ○ ○ Floor Vent Microphone ○ ○ ○ Air discharge mode Vent mode
(Vent Mode) Deep mode
(Def.Mode) Mix mode
(Mix Mode) Bi-level mode
(Bi-Level Mode) Floor mode
(Floor Mode)

In addition, as shown in Table 2 below, the magnitude of the air flow sound obtained from the vent-side microphone 32 may be set to "first reference sound", "second reference sound", and "third reference sound". It is configured to determine the air discharge air volume of the blower 12 by comparing with the size.

In particular, the air discharge air volume of the blower 12 when at least one of the air flow sounds (S) obtained from the vent-side microphones 32 is less than the size of the "first reference sound S1", If it is judged that it is "single stage", and is less than the magnitude | size of "the 2nd reference sound S2" larger than the magnitude | size of "the 1st reference sound S1", and is larger than the "first reference sound S1", ), It is determined that the air discharge air volume of "

And a third reference sound S3 having a magnitude greater than that of the second reference sound S2 and having a magnitude greater than that of the second reference sound S2 obtained from the vent microphone 32. Is less than the size of " three stages ", and is larger than the size of the " third reference sound S3 ", the air discharge air volume of the blower 12 is " 4 " Dan ".

Determination of Air Discharge Air Flow Rate Based on Air Flow Sound Volume of Vent Microphone First reference sound (S1) Second reference sound (S2) Third reference sound (S3) Vent side microphone
Air Flow Sound (S) S <S1 S1≤S <S2 S2≤S <S3 S3≤S Air discharge air volume 1 stage 2 stage 3-stage 4-stage

As described above, the control unit 40, by processing the air flow sound of each air discharge vent 19 side input from the air flow information detection unit 30 by the preset logic, the air discharge air volume of the blower 12 And air discharge mode.

In addition, the control unit 40 includes the air of the blower 12 through one or more vent-side microphones 32 provided on the air discharge vent 19 side and air flow sounds input from the vent-side microphones 32. By grasping the discharge air volume and the air discharge mode, it is possible to grasp the air discharge air volume information and the air discharge mode information of the blower 12 only by the HVAC itself, not in connection with the air conditioning control controller installed in the vehicle. It is configured to drive the ANC device 20 by itself using the received information.

Therefore, if only the HVAC itself is sold as a single product, especially when exporting only the HVAC itself as a single product, the ANC device of the HVAC system without being linked with the air conditioning control controller of the local vehicle. (20) can be operated independently.

As a result, the ANC device 20 of the HVAC system can be operated regardless of the vehicle type, and as a result, the use rate of the parts can be increased, and thus, it is very suitable for the sale and export of the HVAC unit separately. useful.

2 and 3 again, the control unit 40 that grasps the air discharge wind amount and the air discharge mode of the blower 12 determines a filter value corresponding to the determined air discharge wind amount and the air discharge mode of the blower 12. And detects the speaker 24 of the ANC device 20 according to the detected filter value.

In particular, the controller 40 does not control the speaker 24 based solely on the noise of the blower 12 obtained by the noise microphone 22 of the ANC device 20, and the air discharge air volume of the current blower 12 is not limited to the current. The control value of the speaker 24 for the blower 12 noise is filtered by a filter value corresponding to the air discharge mode, and then the speaker 24 is controlled based on the filtered control value.

Therefore, unlike the conventional technique of controlling the speaker 24 only by the noise of the blower 12 obtained by the noise microphone 22, the air discharge air volume of the blower 12 in the process of controlling the speaker 24. And both the air discharge mode state can be taken into account.

As a result, the air discharge wind volume of the blower 12 and the air conditioning noise which are changed according to the air discharge mode state can be actively responded. As a result, the air flows into the vehicle interior regardless of the air discharge wind volume and the air discharge mode of the blower 12. The air conditioning noise can be reduced efficiently.

Here, the control unit 40, the air discharge air volume of the blower 12 and the filter value corresponding to the air discharge mode is stored in various ways, the filter value for each air discharge air volume and air discharge mode of the blower 12 Based on test data obtained through repeated test results.

Next, an example of the operation of the air conditioner according to the present invention will be described in detail with reference to FIGS.

First, referring to FIGS. 4 and 3, in a state in which the air conditioning apparatus and the ANC apparatus 20 are turned on (S101), air flow sounds discharged from each air discharge vent 19 are obtained (S103). .

At this time, the air flow sound acquisition of the air discharge vent 19 uses the vent-side microphones 32 provided on each air discharge vent 19 side.

When the acquisition of the air flow noise on each air discharge vent 19 side is completed, the control unit 40 processes the obtained air flow sound on each air discharge vent 19 side to generate air discharge air volume and air of the blower 12. The discharge mode is determined (S105).

At this time, the control unit 40 determines whether the air flow sounds of the vent microphones 32 are compared with the magnitude of the obtained air flow sounds, thereby determining the air discharge air volume and the air discharge mode of the blower 12. .

On the other hand, when the grasp of the air discharge wind amount and the air discharge mode of the blower 12 is completed, the control part 40 detects the filter value corresponding to the grasped air discharge wind amount and the air discharge mode (S107). .

When the detection of the filter value is completed, the control unit 40 controls the speaker 24 of the ANC device 20 in accordance with the detected filter value (S109).

In particular, the control unit 40 controls the speaker 24 of the ANC device 20 by filtering the noise of the blower 12 obtained by the noise microphone 22 of the ANC device 20 by the detected filter value. .

Then, the ANC apparatus 20 is controlled according to the control value which considered the air discharge wind amount of the blower 12, and the air discharge mode state.

As a result, it is possible to efficiently reduce the air conditioning noise flowing into the vehicle cabin while actively coping with the air conditioning wind volume of the blower 12 and the air conditioning noise that changes according to the air discharge mode state.

According to the air conditioner of the present invention having such a configuration, through the vent side microphone 32 of the air discharge vent 19 to obtain the air flow sound of the air discharge vent 19 side, the obtained air discharge vent 19 The air discharge air volume and the air discharge mode state of the blower 12 is identified through the side air flow sound, and the structure of controlling the ANC device 20 based on the determined air discharge air volume and the air discharge mode state of the blower 12. to be.

Therefore, the ANC device 20 can be controlled in consideration of both the air discharge wind amount and the air discharge mode state of the blower 12, whereby the air conditioning varies according to the air discharge wind amount and the air discharge mode state of the blower 12. Can actively respond to noise.

In addition, since the air discharge wind volume of the blower 12 and the air conditioning noise change depending on the air discharge mode state can be actively responded, the air conditioning noise introduced into the cabin irrespective of the air discharge wind volume and the air discharge mode of the blower 12 Can be reduced efficiently.

In addition, the air discharge sound of the air discharge vent 19 is obtained through the vent side microphone 32 of the air discharge vent 19, and the air flow noise of the blower 12 is obtained through the obtained air discharge sound of the air discharge vent 19. Since it is a structure that grasps the air discharge air volume and the air discharge mode state, the air discharge air volume information and the air discharge mode information of the blower 12 are grasped by only the HVAC itself without being connected to the air conditioning control controller installed in the vehicle. The ANC device 20 can be driven by itself.

In addition, since the HNC itself can drive the ANC device 20 by grasping the air discharge wind volume information and the air discharge mode information of the blower 12, the structure and the structure connected to the air conditioning control controller of the vehicle and Alternatively, it is possible to operate the ANC unit 20 of the HVAC regardless of the vehicle type, and as a result, it is possible to increase the common use rate of the parts, which is very useful for the sale and export of the HVAC unit separately. Do.

Second Embodiment

Next, Figures 5 and 6 are views showing a second embodiment of the vehicle air conditioner according to the present invention.

In the air conditioner of the second embodiment, the air flow rate information of the blower 12 and the air flow information detection unit 30 capable of detecting the air discharge mode information are configured as the air conditioning control controller 50. .

The air conditioning control controller 50 controls each unit of the air conditioning apparatus according to a control value set automatically or manually, and grasps the current state of each unit based on a feedback signal provided from each unit, and then based on this. By re-controlling the units, the air discharge wind volume information and the air discharge mode information of the blower 12 are configured through feedback signals provided from the blowers 12 and the respective mode doors 18.

The air conditioning control controller 50 that detects the air discharge air volume information of the blower 12 and the air discharge mode information, controls the controller 40 to display the air discharge air volume information of the blower 12 and the air discharge mode information. To enter.

Accordingly, the controller 40 can determine the air discharge wind amount and the air discharge mode state of the blower 12 based on the input air discharge wind amount information of the blower 12 and the air discharge mode information. The ANC device 20 is configured to be controlled based on the air discharge wind amount and the air discharge mode state of the blower 12.

The air conditioning control controller 50 is provided with a microprocessor and a driving circuit, and since it is a well-known technique, detailed description thereof will be omitted.

The air conditioner of the second embodiment having such a configuration is configured to sense the air discharge air volume information and the air discharge mode information of the blower 12 through the air conditioning control controller 50, so that the vent side microphone 32 is used. Unlike the first embodiment, it is possible to detect the air discharge air volume information and the air discharge mode information of the blower 12 without installing a separate component. Therefore, the cost reduction effect can be expected.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

10: air conditioning case 10a: internal flow path
12: blower 14: evaporator
16: Heater Core 18: Mode Door
19: Vent 19a: Defrost Vent
19b: Face Vent 19c: Floor Vent
20: noise reduction device 22: noise microphone (Mic)
24: Speaker 30: Air flow information detector
32: vent side microphone (Mic) 40: control unit
50: air conditioning controller

Claims (8)

And a noise reduction device 20 capable of reducing air conditioning noise, and the noise reduction device 20 includes a noise microphone 22 capable of acquiring air conditioning noise and an air conditioning noise obtained from the noise microphone 22. In the vehicle air conditioner comprising a speaker (24) for reducing the air conditioning noise by outputting a noise reduction sound wave based on the
An air flow information detector 30 capable of detecting air flow information flowing along the internal flow path 10a of the air conditioning case 10;
And a control unit 40 for controlling the speaker 24 in consideration of the air flow information of the air flow information detection unit 30 and the air conditioning noise obtained from the noise microphone 22. Device. The method of claim 1,
The control unit 40,
The control unit 24 controls the speaker 24 by filtering the control value of the speaker 24 for the air conditioning noise acquired by the noise microphone 22 according to the air flow information of the air flow information detector 30. Vehicle air conditioner. The method of claim 2,
The air flow information detecting unit 30 detects the air discharge wind amount information and the air discharge mode information of the blower 12;
The control unit 40,
Built-in filter values for each air discharge air volume and air discharge mode of the blower 12,
Vehicle air conditioning, characterized in that for filtering the control value of the speaker 24 by a filter value corresponding to the air discharge air volume information and the air discharge mode information of the blower 12 input from the air flow information detection unit 30 Device. The method of claim 3, wherein
The air flow information detector 30
One or more vent side microphones installed on one or more air discharge vents 19 of the air discharge vents 19 of the air conditioning case 10 to obtain air flow sounds discharged from the air discharge vents 19 ( 32);
The control unit 40,
It is determined whether the vent side microphone 32 acquires the air flow sound to determine the current air discharge mode state, and compares the obtained air flow sound with a preset value to determine the air discharge air volume of the blower 12. Vehicle air conditioning apparatus characterized by grasping. The method of claim 4, wherein
The vent side microphone 32 of the air flow information detection unit 30,
Defrost vent 19a for discharging air to the windshield side, a face vent 19b for discharging air to the passenger's face, and a floor for discharging air to the floor surface of the cabin Vehicle air conditioning apparatus, characterized in that each installed on the side (Floor Vent) (19c). The method of claim 5,
The control unit 40,
If it is determined that the air flow sound is obtained only from the face vent 19b side microphone 32 among the vent side microphones 32, it is determined that the current air discharge mode is the vent mode;
If it is determined that the air flow sound is obtained only in the microphone 32 of the defrost vent 19a, it is determined that the current air discharge mode is the deep mode;
If it is determined that the air flow sound is obtained in two places of the defrost vent 19a side microphone 32 and the floor vent 19c side microphone 32, it is determined that the current air discharge mode is the mixed mode;
If it is determined that the air flow sound is obtained at both the face vent 19b side microphone 32 and the floor vent 19c side microphone 32, the current air discharge mode is determined to be a bi-level mode;
If it is determined that the air flow sound is obtained only in the floor vent (19c) side microphone 32, the vehicle air conditioner characterized in that the current air discharge mode is determined to be the floor mode. The method of claim 6,
The control unit 40,
The magnitude of the air flow sound (S) obtained from the vent side microphone 32,
If it is less than the preset first reference sound (S1), it is determined that the air discharge air volume of the blower 12 is one stage;
If the size of the first reference sound (S1) or more and less than the size of the second reference sound (S2) larger than the first reference sound (S1), it is determined that the air discharge air volume of the blower (12) is two stages;
If the size of the second reference sound (S2) or more than the size of the third reference sound (S3) larger than the second reference sound (S2), it is determined that the air discharge air volume of the blower 12 is three stages,
When the size of the third reference sound (S3) or more, the air discharge air volume of the blower (12) characterized in that it is determined that the four stages. The method of claim 3, wherein
The air flow information detector 30
Air conditioning control controller for sensing the air discharge air volume information and the air discharge mode information of the blower 12 through a feedback signal provided from the blower 12 and each mode door 18 for controlling the air discharge mode ( 50);
The controller 40 filters the control value of the speaker 24 by filter values corresponding to the air discharge wind amount information of the blower 12 input from the air conditioning control controller 50 and the air discharge mode information. Vehicle air conditioner characterized in that.

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