KR100494781B1 - Variable damping apparatus of door opening and shutting sound for vehicle - Google Patents

Abstract

The present invention uses the door glass as a dynamic damper to prevent the vibration of the door to improve the door opening and closing sound by using the LVDT (Linear Variable Differential Transformer) to prevent the vibration of the door by the change of the opening and closing speed of the door Detecting and suppressing vibration of the door due to various door opening and closing speeds by the dynamic stabilizer to improve door opening and closing sounds for each frequency band;

A door glass inserted and installed between the door outer panel and the door inner panel of the vehicle door via a weather strip;

A door belt rail installed at a predetermined interval inside the door inner panel;

A dynamic stabilizer having one side fixed and configured by a damper and an elevity in which a magnetorheological fluid is enclosed in a plate attached to one side of the door belt rail in a predetermined area;

A rubber pad installed to be in contact with one surface of the door glass while being hinged to the other side of the dynamic stabilizer;

It is to provide a variable damping control device for a vehicle door comprising a damper control of the dynamic stabilizer and an electronic control device that is electrically connected to sense the signal of the elevity and controlled by the predetermined information.

Description

VARIABLE DAMPING APPARATUS OF DOOR OPENING AND SHUTTING SOUND FOR VEHICLE}

The present invention relates to a variable opening and closing attenuation device for a vehicle door, and more particularly, to improve the door opening and closing sound by using a door glass as a dynamic damper for preventing the vibration of the door (LVDT: Linear Variable Differential) Detect door vibration by changing the opening / closing speed of the door using a transformer, and suppress the door vibration by the magnetorheological fluid-filled damper by dynamic stabilizer to improve the door opening and closing sound by frequency band It relates to a variable opening and closing sound attenuation device of a vehicle door.

In general, the opening and closing sound of the door is the most important first impression for general buyers to contact and evaluate the car, and plays an important role in determining the consumer's desire to purchase and the quality of the vehicle.

 Objective evaluation factors of the door opening and closing sound can be largely divided into sound pressure, loudness, decay time, sharpness, roughness, and the like. There are Semantic Differential Method (PCM) and Paired Comparison Method (PCM).

 SDM is mainly used to evaluate the characteristics of the sound by selecting the vocabulary representing the characteristics of the sound to be evaluated, and comparing the characteristics of the sound by analyzing the evaluation values for each vocabulary. It is often used to determine which sound is best.

 That is, in order to improve the door opening and closing sound, the door structure should rapidly attenuate high frequency vibration noise of 2.5kHz or more due to resonance, and in particular, the vibration noise in the 1 ~ 2kHz region sensitive to the human ear should be reduced.

 In addition, in order to identify the problem area of the door opening and closing sound, it is necessary to measure the vibration of each part of the door and to measure the frequency response function of the parts exhibiting the vibration corresponding to the problem noise frequency to determine whether the door structure is resonated by each part.

The conventional door structure according to this is shown in FIG. 1, and a diagram showing the improvement in the case of evaluating the door opening and closing sound and the specific high frequency noise using the conventional door structure is shown in FIG. 2.

The door 2 is attached to the window glass rail 8 with a predetermined gap between the door inner panel 4 and the door outer panel 6, and the rubber pad 10 and the rubber pad 10 on the inner side faced thereto. After the weather strip 12 is interposed between the upper edges of the door inner panel 4 and the door outer panel 6, the door glass 14 is inserted between the door inner panels 14 so as to be supported therebetween.

Evaluating the door opening and closing sound by the above-described method of the door (2) it can be seen that the noise (V) is greatly generated at a specific high frequency (L), in order to improve the specific door opening and closing speed High noise (V) generated at a specific high frequency (L) is reduced to low noise (V1).

As described above, when evaluating the door opening and closing sound, only the specific door opening and closing speed is evaluated, thereby improving the frequency-specific improvement of the door opening and closing sound due to resonance caused by various door opening and closing speed changes.

In addition, the door glass of the door cannot play more than the mass when viewed from the vibration side, so the rubber pad is a fixed type and cannot absorb the impact of the door glass during the flow of the door glass. There is a limit to reducing the frequency only.

In order to solve the problems of the prior art made as described above, an object of the present invention is to improve the door opening and closing sound (LVDT :) by using the door glass as a dynamic damper for preventing the vibration of the door. By detecting the vibration of the door by the change of the opening and closing speed of the door by using the Linear Variable Differential Transformer, and suppressing the vibration of the door by the various door opening and closing speed by the dynamic stabilizer, The present invention provides a variable sound damping device.

The present invention for realizing this

A door glass inserted and installed between the door outer panel and the door inner panel of the vehicle door via a weather strip;

A door belt rail installed at a predetermined interval inside the door inner panel;

A dynamic stabilizer having one side fixed and configured by a damper and an elevity in which a magnetorheological fluid is enclosed in a plate attached to one side of the door belt rail in a predetermined area;

A rubber pad installed to be in contact with one surface of the door glass while being hinged to the other side of the dynamic stabilizer;

The present invention provides a vehicle door vibration preventing device including a damper control of the dynamic stabilizer and an electronic control device that is electrically connected to sense a signal of an elevity and control it by preset information.

The dynamic stabilizer includes a support plate fixed to a plate, a support plate hinged with rubber pads facing each other at regular intervals, and a magnetic plate installed between the fixing plate and the support plate to operate by an electrical signal of an electronic controller. To provide a variable damping device for opening and closing the door of a vehicle comprising a damper with a fluid sealed and an elevity is installed to connect the electrical signal to the electronic control device for measuring the vibration at the lower side of the damper. .

The damper includes a hollow spring having an attachment plate formed on both sides thereof, a magnetorheological fluid filled and enclosed in the spring, and an electromagnet arranged to be magnetized by an electrical signal of an electronic controller at a predetermined distance from the spring to the outside. The present invention provides a variable opening and closing attenuation device for a vehicle door.

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

Figure 3 is a view showing the configuration of the variable opening and closing sound attenuation device of the door according to the invention, Figure 4 is an enlarged view showing a damper applied to Figure 3, Figure 5 is a variable opening and closing sound of the door according to the invention It is a figure which showed the effect of the attenuation apparatus compared with the graph.

The opening / closing sound variable attenuator 22 of the vehicle door includes a door glass 24, a door bell trail 26, a dynamic stabilizer 28, a rubber pad 30, and an electronic controller 32 of the vehicle door 23. And the like.

The door glass 24 is inserted between the door outer panel 34 and the door inner panel 36 of the vehicle door 23 with the weather strip 38 interposed therebetween.

The door bell trail 26 is installed at a position parallel to the door glass 24 at a predetermined distance from the inside of the door inner panel 36.

The dynamic stabilizer 28 has a damper 44 and an ellipse encapsulated with a magnetorheological fluid 42 having one side fixed on a plate 40 attached to a predetermined area on one side of the door belt rail 26. DLT (Linear Variable Differential Transformer) 46.

To this end, the dynamic stabilizer 28 has a fixed plate 50 fixed to the plate 40 and supports the rubber pads 30 spaced apart from each other at regular intervals with respect to the fixed plate 50. The dynamic stabilizer 28 is operated by an electrical control signal of the electronic control device 32 between the fixed plate 50 and the support plate 52. A damper 44 having a magnetorheological fluid 42 encapsulated therein, and a vibration transmitted from the rubber pad 30 at a lower side of the damper 44 to measure the vibration and transmit it to the electronic controller 32. It consists of a configuration including the elevity 46 is connected to be installed to apply as a normal signal.

The damper 44 includes a hollow spring 56 having the attachment plate 54 formed on both sides thereof, a magnetorheological fluid 42 enclosed and filled in the hollow spring 56, and the hollow spring ( A magnetorheological fluid encapsulated in the hollow spring 56, comprising an electromagnet 58 disposed to be magnetized by an electrical signal of the electronic control device 32 at an outer periphery at a predetermined distance from the base 56. Reference numeral 42 changes its characteristic value according to the magnetization degree of the electromagnet 58, so that the characteristic value of the hollow spring 56 can be changed.

The rubber pad 30 is connected to the other side of the dynamic stabilizer 28 by a hinge 48 and is installed to be in contact with one surface of the door glass 24 at a predetermined portion.

The electronic controller 32 is electrically connected and installed to control the damper 44 of the dynamic stabilizer 28 and to sense the signal of the LV 46 and control it by preset information.

6 is a view for explaining the principle (a), structure (b), the output characteristics (c) of the elevity applied to the present invention, the principle (a) of the elevity 46 is The coil 60 wound around the wire becomes a magnet by flowing an electric current. On the contrary, when the magnet is inserted into or removed from the coil 60, the current flows through the coil 60. This is called electromagnetic induction. It is a phenomenon found.

The application of the two properties of the electromagnetic induction is a transformer that is used as a power source for home power. The transformer is wound around coils at positions opposite to each other in a quadrilateral iron core 62, and the primary coil 64 When the AC voltage V1 flows through, the iron core 62 alternately changes the direction of the magnetic poles, so that the secondary coil 66 flows the AC voltage V2 proportional to the winding at the same frequency.

The LV 46 is a transformer having a variable iron core for reading the change in length by applying the principle of electromagnetic induction.

Accordingly, the structure of the elevity 46 will be described with the primary coil 68, the secondary coil 70, and the variable iron core 72.

This has a structure in which the primary coil 68 is sandwiched between two secondary coils 70. The winding ends of the secondary coils 70 are connected to each other so that the two terminals of the winding start are used as output terminals.

When an alternating voltage is applied to the primary coil 68 in this state, when the iron core 72 is located at the center of the two secondary coils 70, the voltages of the mutual secondary coils become equal, and the output voltage is It does not occur and the position of the iron core is called the equilibrium point.

On the other hand, when the iron core 72 is shifted from the equilibrium point, mutual inductance changes between the primary coil 68 and the two secondary coils 70, and the secondary coil 70 closer to the iron core 72 is changed. Since the voltage is higher than that of the secondary coil 70 on the far side, the voltage difference is output as an AC voltage.

The shape of the LVDT 46 is thinner and longer than the thicker and shorter, so the linearity and output safety are excellent.

Referring to the output characteristic c of the LV 46, the relationship between the iron core position x and the output voltage E 0 of the LV varies linearly over a wide range.

The dotted line 74 indicates voltages E1 and E2 occurring in the two secondary coils, and a relationship of E0 = (E1-E2) is established between them.

The reason why the voltage E0 is V-shaped at the equilibrium point is that the output voltage phase angle of AC is inverted by 180 degrees.

The reason why the voltage near the equilibrium point is not zero is that the output voltage does not become zero due to magnetic or electrical imbalance even if the iron core is in the center position due to the residual voltage. It happens

In addition, the magnetorheological fluid 42 applied to the present invention will be described with reference to FIG. 7. The magnetorheological fluid (hereinafter referred to as MR fluid) is a micron-sized magnet in a nonconductive solvent such as silicone oil or mineral oil. It is a non-colloidal solution in which dispersible particles are dispersed.If the magnetic field is not loaded, the dispersed particles have Newtonian fluid properties.However, when the magnetic field is loaded, the dispersed particles are polarized, forming fibers in a direction parallel to the loaded magnetic field. It is a solidifying fluid that is resistant to flow.

Until now, research on electric rheological fluid (hereinafter referred to as ER fluid), a kind of controllable fluid like MR fluid, has been mainly limited to semi-active devices such as linear dampers and mounts, but recently, the advantages of fast response speed of ER fluid There is an active research on MR fluids that have the same strengths as above and overcome the disadvantages such as low yield stress, narrow operating temperature range, and especially susceptibility to impurities.

Referring to the operation of the present invention made as described above, the electronic control device 32 when opening and closing the door of the vehicle by the set information, the opening and closing sound vibration generated during the opening and closing of the door 23, the elevity 46 ) Is measured.

Accordingly, the electronic control device 32 receiving the voltage measured from the LV 46 converts the voltage into displacement, and converts the acceleration component obtained through the second derivative over time to FFT (Fast Fourier Transform). Through the analysis through this, the frequency of the maximum vibration component of the door 23 is determined.

Therefore, the electronic controller 32 is inherent in the door 23 in which an annoying closing sound occurs due to the excitation of the door 23 by the current door 23 opening and closing speed based on the frequency determined in the above process. In order to avoid the frequency, the voltage applied to the electromagnet 58 on the damper 44 side of the dynamic stabilizer 28 is controlled. At this time, the degree of the voltage applied to the electromagnet 58 on the damper 44 side by the electronic controller 32 may be selected from preset data that is optimized and input through a plurality of tests.

As the voltage selected to be optimally applied to the electromagnet 58 is applied through the series of processes as described above, the magnetorheological fluid (MR) 42 in the hollow spring 56 is subjected to vibration and resonance of the door 23. It has a spring coefficient that can minimize the high frequency of the door closing noise caused by. That is, the spring characteristic of the hollow spring 56 is changed.

In addition, the dynamic stabilizer 28 can dynamically control the door closing sound of the high frequency caused by the door resonance during the opening and closing of the door 23 for each frequency.

In other words, in Figure 5, the initial opening and closing speed vibration of the conventional door (V1) is reflected in the design is lowered to the vibration (V2), but after that it was not reflected in the design had to listen to the opening and closing sound (V3) to worry about the door opening and closing speed. By applying the variable opening and closing sound attenuation device 22 of the door of the present invention, the vibration generated according to the opening and closing speed of the door 23 is enclosed in the magnetorheological fluid 42 according to the degree of magnetization by the electromagnet 58 The vibration of the door opening and closing sound (V2) can be effectively reduced by appropriately responding to each door closing sound frequency, such as being attenuated by controlling the change of the spring characteristic changed in the mold spring 56.

According to the present invention, by controlling the spring characteristics of the damper for each frequency appearing according to the door closing sound, it is possible to improve the effect of reducing the opening and closing sound to improve the productability of the product.

In addition, it is possible to improve the reduction effect on the generation of the opening and closing sound of the door by reflecting all the vibrations according to the opening and closing speed of the door to reflect the door opening and closing sound of the prior art.

In addition, the rubber pad hinged to the dynamic stabilizer at the time of vertical flow of the door glass is in constant contact with the door glass, thereby absorbing the impact of the door glass when the door glass flows.

On the other hand, the spring in which the magnetorheological fluid is sealed in the damper has a variable spring characteristic for attenuation of the door closing noise of the high frequency caused by the vibration and resonance of the door, thereby reducing the vibration and noise generated as possible. .

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1 is a view showing a door structure according to the prior art.

2 is a graph illustrating a case of evaluating a door structure and reducing specific high-frequency noise according to the related art.

3 is a view showing the configuration of a door vibration preventing device according to the present invention.

4 is a view showing a damper applied to FIG.

5 is a graph showing the effect of the door vibration preventing device according to the present invention in comparison with the graph.

Figure 6 is a view for explaining the principle (a), structure (b), output characteristics (c) of the LV applied to the present invention for reference.

7 is a view for explaining the magnetic variable fluid applied to the present invention for reference.

* Description of the symbols for the main parts of the drawings *

22: door open and close variable attenuation device 23: door

24: door glass 26: door bell trail

28: dynamic stabilizer 30: rubber pad

32: Electronic control device 34: Door outer panel

36: door inner panel 38: weather strip

40: plate 42: magnetic rheology fluid

44: damper 46: elvity

50: fixed plate 52: support plate

54: mounting plate 56: hollow spring

58: electromagnet

Claims (3)

A door glass 24 inserted and installed between the door outer panel 34 of the vehicle door 23 and the door inner panel 36 via a weather strip 38; A door belt rail 26 installed at a predetermined interval inside the door inner panel 36; The fixing plate 50 fixed to the plate 40 attached to a predetermined area on one side of the door belt rail 26 and the door glass 24 while facing the fixing plate 50 at regular intervals. The magnetorheological fluid 42 therein between the rubber pad 30 in contact with the support pad, the support plate 52 provided with the rubber pad 30 by the hinge 48, and the fixing plate 50 and the support plate 52. ) Is installed between the damper 44 and the fixing plate 50 and the support plate 52, and is installed with the damper 44 and measures vibrations transmitted through the rubber pad 30. A dynamic stabilizer 28 consisting of 46), And an electronic controller 32 for controlling the power applied to the magnetorheological fluid 42 enclosed in the damper 44 according to the degree of vibration sensed from the LV 46. Variable opening and closing sound attenuation device of a vehicle door. delete The method of claim 1, The damper 44 has a hollow spring 56 having both sides attached to the fixing plate 50 and the support plate 52 on both sides, and a predetermined distance from the spring 56 to the outer periphery. An electromagnet 58 arranged to be magnetized by an electrical signal of the electronic control device 32, wherein the magnetorheological fluid 42 is enclosed and filled in the hollow spring 56 to open the vehicle door. Phenomena variable damper.