KR101230905B1 - Device for mounting VESS of vehicle - Google Patents

Abstract

The present invention relates to an apparatus for mounting a virtual engine sound system for virtually generating engine sounds in a hybrid vehicle or an electric vehicle.
The present invention applies a metal bush having a dynamic damper that resonates at a specific frequency to a mounting portion of a virtual engine sound system, thereby implementing a new type of mounting device that can reduce the sound of a specific frequency flowing into the room. The dynamic damper effect reduces the sound of a specific frequency and, in turn, provides a virtual engine sound system mounting device for a vehicle that can significantly lower indoor intake.

Description

Device for mounting the virtual engine sound system of the vehicle {Device for mounting VESS of vehicle}

The present invention relates to an apparatus for mounting a virtual engine sound system of a vehicle, and more particularly, to an apparatus for mounting a virtual engine sound system for virtually generating engine sounds in a hybrid vehicle or an electric vehicle.

Most of the recent hybrid and electric vehicles that are being introduced are adding a number of advanced specifications that consider the safety of customers and pedestrians, such as the Virtual Engine Sound System (VESS). to be.

In the case of low noise driving, such as EV mode driving of a hybrid vehicle or an electric vehicle, the noise generated by the vehicle is very low, and thus it is a problem for pedestrians, especially blind people, to recognize the vehicle approach.

To this end, in recent hybrid vehicles and electric vehicles, virtual engine sounds and warning sounds are reproduced through out-of-vehicle speakers to help pedestrians easily recognize vehicle access, and such a technology can be seen in FIG. It is referred to as a sound system 100.

For example, pedestrians may not recognize the vehicle approaching the vehicle when driving at low speeds of 20 km / h or less because of the EV driving mode. It is a trend that is being introduced.

The sound characteristics of the virtual engine sound system currently being applied are composed of a combination of pure sound (beep ~ beep ~ beep ~) and synthesized sound (woong ~ ung ~ woong) that simulates the engine sound.

On the other hand, in the case of the virtual engine sound system, the sound source selection is important, but the sound emitted to the outside of the vehicle in the current mass production or development of the vehicle should be clear to pedestrians, but it is desirable to make the minimum to the indoor driver.

To this end, as shown in FIG. 2, a color bush 130 made of a combination of a metal bush 110 and a rubber bush 120 is applied to a mounting portion due to excessive indoor transmission sound of an electric vehicle virtual engine sound system. It is focusing on noise reduction.

For example, FIG. 3 is a graph showing test results related to sound of a virtual engine sound system, and shows distribution of in-vehicle and in-door sound when a color bush is applied.

That is, it can be seen that the recognition of the vehicle is increased by adding the insulation structure of the speaker mounting part (color bush) + sound source tuning + gain (51 → 55), and changing the control logic (VESS sound only when driving: 2 -20 kph), it can be seen that the indoor inflow of noise is improved.

Here, the pure sound of 200, 500, 1200Hz is radiated when only the thick line graph is viewed, and 200Hz sound is introduced into the room without loss (5dB improvement).

However, there is a limit in reducing the noise flowing into the room from the virtual engine sound system with only the color bushes, and there is still a need for improvement.

Therefore, the present invention has been made in view of the above, by applying a metal bush having a damper portion resonating at a specific frequency to the mounting portion of the virtual engine sound system, a new that can reduce the sound of a specific frequency flowing into the room The purpose of the present invention is to provide a virtual engine sound system mounting apparatus for a vehicle that can reduce the sound of a specific frequency due to the dynamic damper effect of the metal bush, and can significantly lower indoor inflow.

In order to achieve the above object, the virtual engine sound system mounting apparatus of a vehicle provided by the present invention is mounted together in a mounting portion of a virtual engine sound system, and is a combination of an inner metal bush and an outer rubber bush that are inserted into and coupled concentrically. In particular, the metal bush is provided with a damper portion integrally vertically extending from one side of the lower edge of the bush body, the damper portion is characterized in that it can reduce the sound of a specific frequency band while performing a damper function by resonating to the VESS sound have.

Here, the damper portion may be composed of a mass portion that plays a role of mass and a neck portion that plays a rigid role while connecting the lower end of the mass and the lower end of the bush body.

In addition, it is preferable to tune the mass of the mass portion or the thickness of the neck portion in the damper portion of the metal bush to resonate with the sound of a specific frequency band.

In particular, in the case of the damper portion provided in the metal bush, it is preferable to provide a plurality of pieces having mass portions of different masses, so as to reduce the sound of various specific frequency bands.

The virtual engine sound system mounting apparatus provided by the present invention has the following advantages.

First, the sound of a specific frequency can be reduced by the dynamic damper effect due to the resonance of the damper part provided in the metal bush of the mounting apparatus, and thus, the VESS sound transmitted to the room can be reduced.

For example, if the mounting apparatus of the present invention tuned to 200Hz is applied, there is an effect of improving the indoor inlet sound by about 10dB in the same band.

Second, by implementing a variety of mass and neck thickness of the damper portion provided in the metal bush of the mounting device, there is an advantage to reduce the indoor inlet sound of various frequency bands, such as to adjust two or more sound sources.

1 is a photograph showing a virtual engine sound system mounted on a vehicle
2 is a perspective view showing a conventional virtual engine sound system mounting apparatus (color bush)
Figure 3 is a graph showing the test results related to the sound of the virtual engine sound system
4 is a perspective view showing a virtual engine sound system mounting apparatus according to an embodiment of the present invention
5 is a perspective view showing a virtual engine sound system mounting apparatus according to another embodiment of the present invention
6 is a perspective view showing a virtual engine sound system mounting apparatus according to another embodiment of the present invention
7 is a cross-sectional view showing the installation state of the virtual engine sound system mounting apparatus according to the present invention.
8 is a graph showing test results related to sound when the virtual engine sound system mounting apparatus according to the present invention is applied.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

4 is a perspective view showing a virtual engine sound system mounting apparatus according to an embodiment of the present invention.

As shown in FIG. 4, the mounting apparatus is a device for reducing sound transmitted to a room from a vehicle equipped with the virtual engine sound system 10. It plays a role of reducing the sound of a specific frequency flowing into the system.

To this end, the mounting apparatus is made of a combination of a metal bush 11 and a rubber bush 12 which are arranged concentrically with each other and fitted into and outward, and the fastening bolt is penetrated by the metal bush 11. The rubber bush 12 is coupled to and supported by a virtual engine sound system 10, for example, a bracket for supporting a speaker.

Here, the bush body 13 of the metal bush 11 is an integral type of a cylindrical housing portion fitted into the center hole of the rubber bush 12 and a disc shaped plate portion in close contact with one end surface of the rubber bush 12. It consists of.

In particular, the metal bush 11 includes a damper portion 14 which is integrally formed to extend vertically from one side of the bottom edge of the bush body 13, wherein the damper portion 14 is a damper function while resonating with respect to the VESS sound. It will play a role.

That is, the damper unit 14 receives the sound of the virtual engine sound system 10 and vibrates itself, thereby damping the sound of a specific frequency at this time.

The damper portion 14 is formed in a predetermined rectangular plate shape and has a mass portion 15 serving as a mass, and is integrally connected between the edge of the bush body 13 and the lower end of the mass portion 15. It consists of a thin neck 16 of the rigid role supporting the.

Accordingly, the mass unit 15 may resonate back and forth with the neck 16 as a support point, or be twisted from side to side while receiving the VESS sound through its entire area. As it is absorbed, the sound transmitted to the room can be reduced.

The mounting apparatus provided in the present invention is capable of acting as a dynamic damper for the sound of various frequencies by the size and mass of the mass portion 15 and the dimensions of the neck portion 16, and to the sound source of two or more frequency bands. Dynamic dampers can also be used.

For example, by tuning the size or mass of the mass portion 15 or by tuning the effective length (thickness) of the neck portion 16 to resonate at a specific frequency, the specific sound can be reduced by the dynamic damper effect. have.

Here, in relation to the tuning of the mass and the neck, a mass that fits to a specific frequency through several repeated calibrations while varying the size or mass of the mass and the thickness of the neck for various frequency bands. Tuning can be accomplished by setting the size, mass, and thickness of the neck.

For example, using Equation 1 below, the mass (m) of the mass portion 15 and the stiffness (k) of the neck portion 16 can be tuned for a specific frequency.

-----(1)

-----(One)

Where fn is the natural frequency, τn is the period, ωn is the natural frequency, k is the neck stiffness, and m is the mass mass.

On the other hand, the present invention provides an example in which the damper portion 14 of the metal bush 11 is configured in plural to reduce the sound of a specific frequency band.

To this end, as shown in FIG. 5, the bush body 13 of the metal bush 11 includes two damper portions 14 having different sizes and masses of the mass portions 15 and thicknesses of the neck portions 16. It is provided so that the damper effect on the two sound sources, that is, the sound of two specific frequencies can be made.

That is, the two dampers 14 attenuate the sound while resonating to the sound of different frequencies, thereby effectively reducing the indoor inflow of the VESS sound having two frequency bands.

At this time, the two dampers 14 provided in the bush main body 13 are asymmetrical to form a predetermined angle while following the circumference of the bush main body 13 to minimize the negative interference transmitted to each other. It is preferable to arrange in a structure.

As another example, as shown in FIG. 6, the bush body 13 of the metal bush 11 includes three damper portions 14 having different sizes and masses of the mass portions 15 and thicknesses of the neck portions 16. There is provided a damper action for the sound of three specific frequencies.

That is, the three dampers 14 attenuate the sound while resonating the sound of different frequencies, thereby effectively reducing the indoor inflow of the VESS sound having three frequency bands.

Here, when the three dampers 14 are provided in the bush main body 13, the three dampers 14 at this time is the bush main body 13 in order to minimize the negative interference transmitted to each It is preferable to arrange in a symmetrical structure forming an angle of 180 ° along the circumference of.

Therefore, looking at the installation structure and the damper action of the mounting apparatus is configured as follows.

7 is a cross-sectional view showing an installation state of a virtual engine sound system mounting apparatus according to the present invention.

As shown in FIG. 7, an example in which the damper portion 14 is disposed vertically upward is shown here, and the damper portion 14 is directed in various directions depending on the installation state of the virtual engine sound system. It may be arranged to.

The rubber bush 12 of the mounting apparatus supports the virtual engine sound system 10, and the metal bush 11 is fastened to the panel by bolts and nuts, whereby the virtual engine sound system 10 is connected to the rubber bush ( 12) can be installed on the panel side while receiving the elastic support.

The damper portion 14 integrally formed from the bush body 13 of the metal bush 11 is vertically extended and resonates with a virtual dashed line with respect to the sound transmitted from the virtual engine sound system 10. As the damper function is performed, the VESS sound can be attenuated at this time.

8 is a graph showing test results related to sound when the virtual engine sound system mounting apparatus according to the present invention is applied.

As shown in FIG. 8, here we show the initial solid mounting, an improved collarbush, and the VESS sound attenuation effect of the mounting apparatus of the present invention.

8 shows that the mounting apparatus tuned at 200 Hz, that is, the damper unit 14, is applied, and the room inflow sound is improved by about 10 dB in the same band.

As described above, the present invention implements a mounting apparatus capable of reducing a specific sound through a dynamic damper by resonating with a specific frequency when mounted with a virtual engine sound system, thereby reducing the sound of a specific frequency flowing into the room. There is this.

10: virtual engine sound system 11: metal bush
12: rubber bush 13: bush body
14 damper portion 15 mass portion
16: neck

Claims (5)

As mounted together in the mounting portion of the virtual engine sound system 10,
It is composed of a combination of the inner metal bush 11 and the outer rubber bush 12 to be fitted concentrically coupled to the metal bush 11, the damper extending integrally vertically from one side of the lower edge of the bush body 13 The unit (14) is provided, wherein the damper unit (14) resonates with respect to the VESS sound to perform the damper function while reducing the sound of a specific frequency band of the virtual engine sound system mounting apparatus for a vehicle.
The method according to claim 1, wherein the damper portion 14 is a mass portion 15 to the mass role and the neck portion 16 to the rigid role while connecting the lower end of the mass portion 15 and the lower end of the bush body 13 Virtual engine sound system mounting apparatus of a vehicle, characterized in that configured.
The damper part 14 of the metal bush 11 can be tuned to the mass of the mass part 15 or the thickness of the neck part 16 to resonate with the sound of a specific frequency band. Virtual engine sound system mounting apparatus of the vehicle, characterized in that.
The method according to claim 1 or 2, wherein the damper portion 14 provided in the metal bush 11 is provided with a plurality of having a mass portion 15 of different mass, it is possible to reduce the sound of several specific frequency bands Virtual engine sound system mounting apparatus of the vehicle, characterized in that.
The virtual engine sound of a vehicle according to claim 4, wherein the plurality of dampers 14 provided in the metal bush 11 are arranged in a symmetrical or non-symmetrical structure while following the circumference of the bush body 13. System mounting device.

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