KR100284124B1 - Variable resonance device for reducing intake noise - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a variable resonance apparatus capable of efficiently attenuating the frequency components of the intake noise that changes in conjunction with the engine rpm by efficiently utilizing a small volume of the resonator without limiting the space utilization of the engine room. There is.

In order to achieve the above object, the present invention is connected to the air duct (1) in the vicinity of the air cleaner in the resonance device for attenuating intake noise,

A resonator 3 connected to the air duct 1;

At least one plate valve (4a) (4b) for dividing the entire contents of the resonator (3) into a plurality and variably operated to integrate adjacent contents into one;

At least two necks (5a) (5b) (5c) for connecting each of the interior compartments defined by said valve valves (4a) (4b) to communicate with said air duct (1);

And an actuator for selectively rotating the plate valves 4a and 4b to vary the volume of the resonator 3.

Description

Variable resonance device for reducing intake noise

The present invention relates to a variable resonance apparatus for noise reduction of an intake machine.

The combustion air of the engine generates noise in the process of being introduced from the outside through the air duct by the intake negative pressure of the engine.

Thus, in order to remove the intake noise generated in the process of introducing the combustion air, the resonator 22 is provided in the air duct 21 in front of the air cleaner 20 as shown in FIG.

When the resonator 22 is attached to the air duct 21 as described above, the intake noise corresponding to the resonance frequency exits to the intake end 23 and the noise is attenuated.

At this time, the resonance frequency in the resonator 22 is

f =

Where f is the resonance frequency (Hz)

C: sound speed

S: cross section of the neck of the resonator

L: length of neck

V: volume of resonator

Obtained by the formula

The noise corresponding to the resonance frequency range can be attenuated.

5 is a graph showing the relationship between the intake noise (db) and the resonance frequency according to the engine rpm. When the specifications (volume, neck cross-sectional area, neck length, etc.) of the resonator 22 are determined, the resonance frequency is calculated. Intake noise in the rpm region can be attenuated, indicating that the hatched portion is the noise control region by the resonator.

However, when the specifications are equipped with a constant resonator, there is a problem in that the noise attenuation effect is obtained only within a limited range of a specific rpm region, and there is no noise attenuation effect in other regions. Based on normal operating area.

Therefore, in order to attenuate various noises in each rpm region of the engine, it is necessary to install a plurality of resonators having different specifications, but the installation of the resonators for intake noise control in the engine room is not limited by the cost problem. Due to the lack of space in the engine room, it is unreasonable due to design constraints and aesthetic problems.

Therefore, the present invention has been proposed in view of the above problems, and its object is to

The present invention provides a variable resonator that can efficiently attenuate the frequency components of intake noise by changing with the engine rpm by efficiently utilizing a small volume resonator without limiting the space utilization of the engine room.

The present invention to achieve the above object

Resonance device connected to the air duct near the air cleaner to attenuate intake noise,

A resonator connected to the air duct;

At least one or more plate valves for dividing the entire contents of the resonator into a plurality and variably operated to integrate adjacent contents into one contents;

At least two necks connecting each of the inner compartments defined by the valve to communicate with the air duct;

And an actuator for selectively rotating the plate valve to vary the volume of the resonator.

1 is a view showing an embodiment of a variable resonance device for reducing intake noise according to the present invention

2 is a view showing a more various noise attenuation structure of the variable resonance apparatus of the present invention

3 is a cross-sectional view taken along the line A-A of FIG.

4 and 5 are views for explaining the prior art

※ Explanation of codes for main parts of drawing

1: Air duct 3: Resonator

4a, 4b: Plate valve 5a, 5b, 5c: Neck part

6: plate valve 7: hinge shaft

8a, 8b, 8c: Actuator 9: rpm sensor

10: electronic control device

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a view showing an embodiment of a variable resonance apparatus for reducing intake noise according to the present invention,

Figure 2 is a view showing a more various noise attenuation structure of the variable resonance apparatus according to the present invention, Figure 3 is a cross-sectional view A-A of FIG.

In the drawing, reference numeral 1 denotes an air duct for introducing external air to the air cleaner 2 side by the engine intake negative pressure.

The air duct 1 is connected to a resonator 2, and in the resonator 3, the entire inner volume V is divided into a plurality of inner volumes (two of V1 and V2 in FIG. 1 embodiment, and in FIG. 2 embodiment). At least one valve valve (4a) (4b) ---- is divided into three (V1, V2 and V3), and is operable to integrate the contents of adjacent two sides into one content.

Each interior volume V1, V2, V3 ---- partitioned by the plate valves 4a, 4b is provided through air ducts 5a, 5b, 5c, respectively. Communicate with (1).

The neck portions 5a to 5c are provided with a plate valve 6 which can block or communicate with the air duct 1 and the contents V1, V2 and V3.

The plate valves 4a, 4b, and 6 are formed of disks as shown in FIG. 3 and rotatably mounted by the hinge shafts 7, and each hinge shaft 7 is provided with an actuator 8a. It is connected to (8b) (8c), and it opens and closes by operation of actuator 8a (8b) 8c.

Each of the actuators 8a, 8b, and 8c preferably has a solenoid that is electrically on and off, and is used to control the electronic controller 10 based on information from the rpm sensor 9 that measures the engine speed. It is optionally activated accordingly.

According to the present invention as described above, in the simplest embodiment of FIG. 1, four resonance frequencies are obtained according to the selective opening and closing of the plate valves 4a and 6.

1) When the valve valve 4a is closed and the valve valve 6 is open, two resonance frequencies are generated by the contents V1 and V2, respectively.

f ₁ =

f ₂ =

2) When both the plate valve 4a in the resonator and the plate valve 6 in the neck 5b are opened,

f ₃ =

3) When the plate valve 4a in the resonator is opened and the plate valve b in the neck is closed,

f ₃ =

However, S ₁ , S ₂ : cross-sectional area of each neck

V ₁ , V ₂ : Each content

L ₁ , L ₂ : Length of each neck

Accordingly, if the resonant frequencies f _{1 to} f ₄ are designed to correspond to four different rpm regions, it is possible to attenuate a large area of noise generated at each rpm.

According to the present invention, the contents V ₁ , V _2, V ₃ ---- the length of the neck L ₁ , L ₂ , L ₃ , ---- neck cross-sectional area S ₁ , S ₂ , S ₃ ---- By setting-differently or partly the same but partly differently and selectively controlling the operation of the plate valve in the resonator and the plate valve in the neck, many resonant frequencies can be obtained with one resonator, By canceling the frequency components of other intake noises, it is possible to attenuate the intake noises almost over the entire operating area, and its size is small, which does not limit the space utilization of the engine room.

Claims (2)

A resonance apparatus connected to an air duct (1) near an air cleaner to attenuate intake noise, comprising: a resonator (3) connected to an air duct (1); At least one plate valve (4a) (4b) for dividing the entire contents of the resonator (3) into a plurality and variably operated to integrate adjacent contents into one; At least two necks (5a) (5b) (5c) for connecting each of the interior compartments defined by said valve valves (4a) (4b) to communicate with said air duct (1); A plate valve (6) installed in at least one of the neck parts (5a) (5b) (5c) and operable to block or communicate the contents of the air duct (1) and the resonator (3); A solenoid which is electrically turned on / off to selectively rotate the plate valve to vary the volume of the resonator 3; an electronic controller (10) for selectively driving the solenoids according to engine speed information measured from the rpm sensor (9); Variable resonance device for reducing the intake noise, characterized in that configured to include. The intake noise according to claim 1, wherein the plurality of divided contents of the resonator 3, the lengths of the necks 5a, 5b, 5c, and the neck cross-sectional area are designed to obtain different resonance frequencies. Variable resonance device for abatement.

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