WO2019124772A1

WO2019124772A1 - Air conditioner for vehicle

Info

Publication number: WO2019124772A1
Application number: PCT/KR2018/014405
Authority: WO
Inventors: 김태완; 이종곤; 김정선
Original assignee: 한온시스템 주식회사
Priority date: 2017-12-19
Filing date: 2018-11-22
Publication date: 2019-06-27
Also published as: KR102429335B1; KR20190073724A

Abstract

The present invention relates to an air conditioner for a vehicle. The objective of the present invention is to improve a reduction efficiency of air conditioning noise transmitted to a vehicle interior by improving installation position, number, etc. of microphones of an ANC device for reducing air conditioning noise, and to thus improve ride quality in the vehicle interior. To achieve the objective, the air conditioner for a vehicle according to the present invention comprises: an air conditioner case; a blower for drawing in the inside and outside air and blowing the same to an internal flow path of the air conditioner case; a cooling heat exchanger for cooling the air blown into the internal flow path; a heating heat exchanger for heating the air blown into the internal flow path; and a noise reduction device capable of reducing the air conditioning noise generated in the air conditioner case. The noise reduction device has at least one microphone installed in the internal flow path of the air conditioner case so as to acquire the air conditioning noise; and a speaker for outputting noise-reducing sound waves to the internal flow path of the air conditioner case on the basis of the air conditioning noise acquired by the microphone, thereby reducing the air conditioning noise. At least one microphone is installed in a portion of a warm air flow path in the downstream side of the heating heat exchanger of the internal flow path of the air conditioner case, so as to acquire the air conditioning noise in the downstream side of the heating heat exchanger.

Description

Vehicle air conditioning system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle, and more particularly, to an air conditioner which can reduce the air conditioning noise transmitted to a vehicle interior by improving a microphone installation position and a number of an ANC device for reducing air conditioning noise, And an air conditioner capable of improving the ride comfort of the interior of the passenger compartment.

Noise is one of the biggest causes for lowering the ride comfort of the vehicle. There are various kinds of noise of the vehicle, among which there is the noise of the air conditioner.

The noise of the air conditioner includes vibration and noise generated in the air conditioner compressor, vibration and noise generated in the high pressure refrigerant pipe, and vibration and noise generated in the blower of the air conditioner case. Such vibration and noise significantly deteriorate the ride feeling of the vehicle when it is transmitted to the passenger compartment.

Particularly, the noise and vibration of the air conditioner are directly transmitted to the passenger compartment through the air conditioner case and the discharge vents of the air conditioner case, and the passengers in the passenger compartment feel severe stress and fatigue due to the noise and vibration transmitted. This not only lowers the ride quality of the vehicle, but also affects the driver's safe driving.

Therefore, it is necessary to reduce the noise of the air conditioner in order to improve the ride comfort and safe operation of the driver.

As a method of reducing the noise of the air conditioner, there is ANC (Active Noise Control) technology which outputs sound waves having a waveform opposite to the noise of the air conditioner to the speaker to cancel the noise of the air conditioner.

1 and 2, a microphone 3 and a speaker 5 are provided in the air conditioning case 1, and the noise of the air conditioner (hereinafter referred to as " air conditioning "Quot; noise "), and then outputs a sound wave having a waveform opposite to the acquired air-conditioning noise to the speaker 5. Therefore, the air conditioning noise is canceled and the air conditioning noise is reduced.

Normally, the microphone 3 is installed on the blower 6 side. This is because most of the air conditioning noise is generated in the blower 6, thereby obtaining the noise of the blower 6 which occupies most of the air conditioning noise.

The speaker 5 is configured to be installed in a portion of the air mixing region A where air passing through the cooling heat exchanger 7 and air passing through the heating heat exchanger 8 are combined. This is for attenuating all the noise of the air passing through the heat exchanger (7) for cooling and the heat exchanger (8) for heating.

The conventional ANC technique has a structure in which the microphone 3 for acquiring the air conditioning noise is installed on the side of the blower 6 to mainly acquire noise on the side of the blower 6, It is impossible to obtain the air-conditioning noise which is generated at the portion other than the blower 6 because of such a disadvantage. As a result, there is a problem that the efficiency of air-conditioning noise reduction is low.

Particularly, in the air conditioning apparatus, the main generated portions of the noise are different according to the mode conditions. For example, in the " Cool Mode ", the discharged air of the blower 6 is supplied to the cooling heat exchanger 7 The air flow path is simple and most of the air conditioning noise is generated on the blower 6 side.

However, in the " warm mode ", the discharged air from the blower 6 passes through the cooling heat exchanger 7 and the heating heat exchanger 8, The air flow path is very complicated and the air resistance elements are large so that most of the air conditioning noise is generated in the hot air flow path 9 on the downstream side of the heat exchanger 8 for heating.

Particularly, the air that has passed through the heating heat exchanger 8 collides with the inner wall surface 9a of the hot air flow path 9 corresponding to the downstream side of the heating heat exchanger 8 to form irregular vortices. Rumble noise is generated in the warm air flow path 9 on the downstream side of the heating heat exchanger 8 due to the irregular vortex.

Therefore, as in the prior art, the structure of the microphone 3, which mainly acquires the noise on the blower 6 side, is a structure in which, in the " warm mode ", the downstream side warm air flow path 9 of the heating heat exchanger 8 The air conditioning noise generated in the downstream side warm air flow path 9 of the heat exchanger 8 for heating can not be coped with in the " warm mode ", and as a result, And the "air conditioning noise reduction efficiency" in the "warm mode" is low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a microwave oven capable of acquiring both a blower side air conditioning noise and an air conditioning noise other than the blower To provide an air conditioner.

It is another object of the present invention to provide an air conditioner which can actively cope with blower-side air conditioning noise and air-conditioning noise other than the blower side by making it possible to acquire both the blower-side air conditioning noise and the air- And it is an object of the present invention to provide a vehicle air conditioner capable of enhancing efficiency of reducing air conditioning noise.

It is still another object of the present invention to provide an improved air conditioner which can improve the installation position and the number of the microphones so that when the air conditioner noise generation site varies according to the mode state, To provide an air conditioner.

It is a further object of the present invention to provide an air conditioner which is capable of acquiring air-conditioning noise generated at each air-conditioning noise generating region regardless of a mode state, thereby positively responding to air- And it is an object of the present invention to provide a vehicle air conditioner capable of increasing efficiency of reducing air conditioning noise regardless of a mode state.

In order to achieve the above object, a vehicular air conditioning system according to the present invention comprises: an air conditioning case; a blower for sucking the inside and outside air to blow air into the inside channel of the air conditioning case; 1. A vehicle air conditioning system comprising a heat exchanger, a heating heat exchanger for heating air blown into the internal flow path, and a noise reduction device for reducing air conditioning noise generated in the air conditioning case, At least one microphone installed on an internal flow path of the air conditioner case so as to obtain noise; And a speaker for outputting sound-attenuating sound waves to the internal flow path of the air-conditioning case based on the air-conditioning noise acquired by the microphone to attenuate the air-conditioning noise. At least one microphone is provided in the internal air flow path of the air conditioning case in the hot air flow path portion on the downstream side of the heating heat exchanger so as to obtain the air conditioning noise on the downstream side of the heating heat exchanger.

Preferably, the microphones are provided at two intervals in the hot air flow path portion downstream of the heating heat exchanger at regular intervals.

And one of the microphones is installed on the inner wall surface of the hot air flow path corresponding to the heating heat exchanger in the hot air flow path on the downstream side of the heating heat exchanger and the other is air passing through the cooling heat exchanger, And the air-mixing zone is provided on a downstream side portion of the air-flow passage corresponding to the air-mixing zone where the air passing through the air-mixing zone is merged.

And the speaker is installed in an air mixing area where air passing through the cooling heat exchanger and air passing through the heating heat exchanger are combined in the internal flow path of the air conditioning case; The microphone corresponding to the air mixing area is spaced apart from the speaker installed in the air mixing area at a predetermined distance so as not to be affected by the sound attenuation sound outputted from the speaker.

According to the air conditioning system for a vehicle according to the present invention, the installation position and the number of the microphones are improved to obtain the air conditioning noise on the blower side and the air conditioning noise on the downstream side of the heat exchanger for heating. Therefore, There is an effect that it is possible to effectively cope with the generated air-conditioning noise on the blower side and the air-conditioning noise on the downstream side of the heating heat exchanger, which is mainly generated in the " warm mode ".

In addition, since it is possible to effectively cope with the blower side air conditioning noise generated mainly in the " cool mode " and the air conditioning noise on the downstream side of the heating heat exchanger generated mainly in the " warm mode " There is an effect that the air conditioning noise on the downstream side of the heat exchanger for heating can be efficiently reduced.

Further, regardless of the mode state, it is possible to efficiently reduce the air-conditioning noise on the blower side and the air-conditioning noise on the downstream side of the heat exchanger for heating, thereby improving the efficiency of reducing the air conditioning noise regardless of the mode state. As a result, Can be remarkably improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an ANC apparatus installed in a conventional automotive air conditioner;

2 is a side sectional view showing an ANC apparatus of a conventional automotive air conditioner,

FIG. 3 is a view showing an ANC apparatus of a vehicle air conditioner according to the present invention, which is an example of a case where an ANC apparatus is installed in a semi-center mounting type air conditioner,

Fig. 4 is a side sectional view of Fig. 3, showing an ANC apparatus of a vehicle air conditioner according to the present invention,

FIG. 5 is a graph showing an example of operation of the ANC apparatus constituting the automotive air conditioner of the present invention. In the "warm mode", the frequency spectrum of the air conditioning noise reduced by the conventional ANC apparatus, A graph showing a comparison of the frequency spectra of the reduced air-conditioning noise,

6 is a view showing an example in which an ANC apparatus of a vehicle air conditioner according to the present invention is installed in a center mounting type air conditioner,

7 is a view showing an example in which an ANC apparatus of a vehicle air conditioner according to the present invention is installed in a rear air conditioner.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a vehicle air conditioner according to the present invention will be described in detail with reference to the accompanying drawings.

First, a car air conditioner according to the present invention will be briefly described with reference to FIGS. 3 and 4. FIG.

The air conditioner for a vehicle has an air conditioner case 10 in which a blower 12, a cooling heat exchanger 14 and a heating heat exchanger 16 are installed.

The blower 12 sucks the inside air and the outside air and blows air into the internal flow path 10a of the air conditioning case 10. The cooling heat exchanger 14 cools the air blown into the internal flow path 10a, (16) heats the air blown to the inner flow path (10a).

4, the heating heat exchanger 14 is disposed on the internal flow path 10a and the heating heat exchanger 16 is connected to the hot air flow path 10b branched from the internal flow path 10a, And a tempo door 18 is provided at a branch point between the hot air passage 10b and the cold air passage 10c.

At this time, the cold air cooled by the cooling heat exchanger 14 passes through the cold air passage 10c, the warm air heated by the heating heat exchanger 16 passes through the warm air passage 10b, Circulates between the cold air flow path 10c and the hot air flow path 10b and adjusts the amount of opening of the air flow path 10c and the air flow path 10b. Therefore, the air volume of the cold and warm air supplied to the passenger compartment is controlled.

On the other hand, the downstream portions of the cold air flow path 10c and the warm air flow path 10b are combined into one unit. The combined air flow path 10c and the downstream portion of the hot air flow path 10b form the air mixing region A do.

The air mixing region A mixes warm air transferred along the hot air passage 10b and cold air flowing along the cold air passage 10c with each other. Accordingly, the hot air and the cold air mixed with each other are supplied to the passenger compartment through the respective air discharge vents 19 while maintaining an appropriate temperature.

Next, the features of the air conditioner for a vehicle according to the present invention will be described in detail with reference to FIG. 3 to FIG.

3 and 4, the air conditioner of the present invention includes an ANC apparatus 20 which is a noise reducing apparatus capable of reducing air conditioning noise.

The ANC apparatus 20, which is a noise reduction apparatus, has at least two microphones 22 capable of acquiring air conditioning noise.

The microphones (22) are installed on the internal flow path (10a) of the air conditioning case (10). Particularly, a first microphone 22a provided on the blower 12 side portion of the internal flow path 10a of the air conditioning case 10 and a second microphone 22b provided on the downstream side warm air flow path 10b of the heating heat exchanger 16 Second and

third microphones

22b and 22c.

The first microphone 22a is installed between the downstream side of the blower 12 and the cooling heat exchanger 14 and the first microphone 22a thus installed acquires the noise generated by the blower 12 . In particular, in the " cool mode ", it is configured to acquire the noise of the blower 12 occupying most of the air conditioning noise.

The second and

third microphones

22b and 22c are installed at a predetermined interval in the warm air flow path 10b on the downstream side of the heating heat exchanger 16. [

Particularly, the second microphone 22b is disposed on the inner wall surface 10b-1 of the hot air passage 10b corresponding to the heating heat exchanger 16 among the hot air passage 10b on the downstream side of the heating heat exchanger 16 And the third microphone 22c is installed at the most downstream side portion of the hot air flow path 10b corresponding to the air mixing region A. [

The second and

third microphones

22b and 22c are configured to obtain the air conditioning noise generated on the downstream side of the heating heat exchanger 16. [

Particularly, in the "warm mode", the second microphone 22b causes the air that has passed through the heating heat exchanger 16 to collide against the inner wall surface 10b-1 of the hot air passage 10b to form a vortex And acquires a rumble-like noise generated by the noise.

The third microphone 22c is configured to acquire the air conditioning noise due to the irregular vortex generated during the process of flowing the air passing through the heating heat exchanger 16 along the hot air flow path 10b which is abruptly refracted.

Here, it is preferable that the third microphone 22c is installed in the last part of the air flow path 10b where air vortexes occur. At this time, the third microphone 22c must be spaced apart from the speaker 30 (to be described later) installed in the air mixing area A at a predetermined interval.

This is because, if the third microphone 22c is installed too close to the speaker 30, there is a possibility of acquiring the " air conditioning noise reduction sound wave " generated by the speaker 30. [

3 and 4, the air conditioner of the present invention outputs a sound wave having a waveform opposite to the air conditioning noise based on the air conditioning noise acquired by the first to

third microphones

22a, 22b, and 22c And a speaker 30 which is connected to the speaker.

The speaker 30 is provided on the internal flow path 10a of the air conditioning case 10 and is configured to be installed on the downstream portion of the air flow path 10c and the air flow path 10b.

Particularly, a portion where the air that has passed through the cooling heat exchanger 14 and the air that has passed through the heat exchanger 16 for heating, for example, a portion where the cold air passage 10c and the air passage 10b, And is installed in a part of the air conditioner case 10 corresponding to the area A.

The speaker 30 having such a structure can attenuate all of the noise of the air passing through the cooling heat exchanger 14 and the heating heat exchanger 16. [

Particularly, regardless of the cool mode and the warm mode, all the noise generated during the air passage process of the cooling heat exchanger 14 and the heating heat exchanger 16, which are the air resistances, can be attenuated . As a result, the air conditioning noise reduction efficiency can be enhanced.

3 and 4, the air conditioner of the present invention includes a controller 40 for controlling the speaker 30 based on the air conditioning noise acquired by the first to

third microphones

22a, 22b, and 22c, .

The control unit 50 is provided with a microprocessor and is configured to control the speaker 30 based on the air conditioning noise of the blower 12 input from the first microphone 22a in the "cool mode".

In particular, the speaker 30 is controlled so as to output a sound wave having a waveform opposite to the air conditioning noise of the blower 12, which is input from the first microphone 22a. Therefore, in the " cool mode ", the air conditioning noise generated at the blower 12 side is attenuated.

The control unit 40 is configured to control the speaker 30 based on the air conditioning noise on the downstream side of the heating heat exchanger 16 inputted from the second and

third microphones

22b and 22c in the "warm mode" do.

In particular, the speaker 30 is controlled so as to output a sound wave having a waveform opposite to the air-conditioning noise on the downstream side of the heating heat exchanger 16 inputted from the second and

third microphones

22b and 22c.

Accordingly, in the " warm mode ", the air conditioning noise generated on the downstream side of the heating heat exchanger 16 is attenuated. Particularly, after passing through the heating heat exchanger 16, the flow noise of the air conveyed along the hot air flow path 10b which is abruptly refracted is efficiently attenuated.

5, the air conditioning noise on the downstream side of the heating heat exchanger 16 is obtained through the second and

third microphones

22b and 22c in the " warm mode " The result of the air conditioning noise measured in the passenger compartment is remarkably reduced as compared with the conventional one.

Particularly, compared with the conventional air conditioning noise, the amplitude of the air-conditioning noise frequency wavelength is small, and the height difference between the bones and the floor is small. As a result, it can be seen that the conventional air-conditioning noise is remarkably reduced and the "air-conditioning noise sensibility" of the passenger is remarkably lowered.

According to the air conditioner of the present invention having such a configuration, the installation positions and the number of the

microphones

22a, 22b, and 22c are improved, and the air conditioning noise on the blower 12 side and the air conditioning noise on the downstream side of the heating heat exchanger 16 It is possible to effectively cope with the air conditioning noise of the blower 12 mainly generated in the " cool mode " and the air conditioning noise of the downstream side of the heating heat exchanger 16 mainly generated in the " warm mode " .

In addition, since it is possible to effectively cope with the air conditioning noise on the blower 12 side which is mainly generated in the " cool mode " and the air conditioning noise on the downstream side of the heating heat exchanger 16 which occurs mainly in the " warm mode " The air conditioning noise on the side of the blower 12 and the air conditioning noise on the downstream side of the heat exchanger 16 for heating can be efficiently reduced.

In addition, regardless of the mode, the air conditioning noise on the blower 12 side and the air conditioning noise on the downstream side of the heating heat exchanger 16 can be efficiently reduced, so that the efficiency of air conditioning noise reduction can be increased regardless of the mode state. As a result, it is possible to remarkably improve the riding comfort of the inside of the car.

3 and 4, the first to

third microphones

22a, 22b, and 22c are installed in an air conditioner of a semi-center mounting type, 6, the present invention can be applied to an air-conditioning apparatus of a center mounting type, in which the blower 12, the cooling heat exchanger 14 and the heating heat exchanger 16 are integrally formed, , It may be applied to a rear air conditioning apparatus for cooling and heating the upright portion of the interior of the vehicle.

In this case, the first to

third microphones

22a, 22b, and 22c are installed on the blower 12 side portion and the downstream portion of the heating heat exchanger 16, as in the case of the semi-center mounting type air conditioner .

Particularly, the first microphone 22a is installed between the downstream side of the blower 12 and the cooling heat exchanger 14, and the second microphone 22b is disposed between the downstream side of the blower 12 and the

cooling heat exchanger

14, 1 is provided on the inner wall surface 10b-1 of the hot air flow path 10b corresponding to the heating heat exchanger 16 in the flow path 10b and the third microphone 22c is arranged on the inner wall surface 10b- And is disposed at the most downstream side portion of the warm air flow path 10b.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

Claims

A blower 12 for sucking the inside air and the outside air and blowing air to the inside air passage 10a of the air conditioner case 10 and a cooling heat exchanger for cooling the air blown into the inside air passage 10a And a noise reducing device capable of reducing the air conditioning noise generated in the air conditioning case (10), wherein the air conditioning case (10) In the air conditioning system,

The noise reduction apparatus comprises at least one microphone (22) installed on an internal flow path (10a) of the air conditioning case (10) so as to obtain air conditioning noise;

And a speaker (30) for outputting a sound attenuation sound wave to the internal flow path (10a) of the air conditioning case (10) based on the air conditioning noise acquired by the microphone (22) to attenuate air conditioning noise;

At least one or more microphones (22) are provided in a portion of the internal flow path (10a) of the air conditioning case (10) on the downstream side warm air flow path (10b) of the heating heat exchanger (16), and the heating heat exchanger Side air-conditioning noise of the air-conditioning room.
The method according to claim 1,

The microphone (22)

Wherein two heating air passages (10b) of the heating heat exchanger (16) are provided at regular intervals.
3. The method of claim 2,

One of the microphones 22 is connected to the inner wall surface 10b of the hot air passage 10b corresponding to the heating heat exchanger 16 among the hot air passage 10b on the downstream side of the heating heat exchanger 16. [ -1)

The other one 22c is connected to the air mixing zone A where the air passing through the cooling heat exchanger 14 and the air passing through the heating heat exchanger 16 are combined, And is installed on a downstream side portion of the vehicle.
The method of claim 3,

The speaker (30)

(A) in which the air that has passed through the cooling heat exchanger (14) and the air that has passed through the heating heat exchanger (16) are combined in the internal flow path (10a) of the air conditioning case Being;

The microphone 22c, which corresponds to the air mixing region A,

Is installed at a predetermined distance from the speaker (30) installed in the air mixing area (A) so as not to be affected by the sound attenuation sound outputted from the speaker (30).
5. The method of claim 4,

The microphone 22c, which corresponds to the air mixing region A,

The hot air flow path 10b corresponding to the last part of the irregular vortex generated in the process of flowing the air passing through the heating heat exchanger 16 through the hot air flow path 10b in the downstream side warm air flow path 10b of the heating heat exchanger 16, (10b) of the vehicle.
6. The method according to any one of claims 1 to 5,

The microphone (22)

Wherein the air conditioning system is further provided at a portion between the downstream side of the blower (12) and the cooling heat exchanger (14) to obtain the air conditioning noise on the blower (12) side.
The method according to claim 6,

The air conditioning noise obtained by the microphone 22a on the blower 12 and the air conditioning noise obtained by the microphones 22b and 22c on the downstream side of the heating heat exchanger 16 , And controlling the speaker (30) based on the selected air conditioning noise.
8. The method of claim 7,

The control unit (40)

The speaker 30 controls the speaker 30 based on the air conditioning noise acquired by the microphone 22a on the blower 12 side during the cool mode of the vehicle cabin, So that it is possible to output sound-attenuating sound waves for the air-conditioning noise generated in the air-

The speaker 30 is controlled based on the air conditioning noise acquired by the microphones 22b and 22c on the downstream side of the heat exchanger 16 for heating in the warm mode of the car interior, So as to output a sound attenuation sound wave for the air conditioning noise generated on the downstream side of the heating heat exchanger (16).