KR19980044952A - Active engine mount of car - Google Patents

Abstract

By accurately and actively coping with the vibration of the engine which varies during the driving of the vehicle, it is possible to reduce the vibration and noise transmitted to the vehicle body. To this end, the active engine mount of the present invention is a solid as the internal space of the case 4 is partitioned by the decoupler 6, and the current is applied to the upper and lower fluid chambers 8a and 8b of the decoupler. ER fluid 9, which is changed from liquid to vice versa, is enclosed, and the decoupler is configured to receive an electrical signal from the ECU according to the operating state of the engine E to form an electric field in the upper and lower fluid chambers. Accordingly, the ER fluid varies in the solid-liquid state by the electric field, changing the mountability of the mount. Therefore, the engine mount of the present invention suppresses vibration and noise with an appropriate elastic force according to the operating state of the engine.

Description

Active engine mount of car

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an active engine mount for a motor vehicle. In particular, by using an electric fluid (ER fluid) that is changed into a solid and a liquid by applying a voltage or through an electric current, vibration is absorbed and reduced according to various operating states of the engine. It's about an active engine mount that makes it possible

As is well known, an engine of an automobile, or a power plant including the engine and a transmission, is supported by a vehicle body via a mount having a function of suppressing vibration and noise.

The mount minimizes the vibration or noise of the engine or the power plant so as not to be directly transmitted to the driver, thereby improving the riding comfort and quietness of the vehicle.

To this end, the mount is provided with a dustproof device. Known dustproof devices include the use of anti-vibration rubber and fluid-enclosed mounting devices that use a viscous fluid together.

Here, conventionally known structures of the fluid enclosed engine mount apparatus are disclosed in Japanese Unexamined Patent Publication Nos. 7-24673 and 7-24675.

Japanese Unexamined-Japanese-Patent No. 7-24673 discloses an electrically viscous fluid sealed cylindrical mount device that exhibits an effective dustproof effect against idling vibration and engine shake, and is simple in structure and excellent in manufacturability.

Japanese Laid-Open Patent Publication No. 7-24675 discloses a fluid-sealed cylindrical mounting apparatus which advantageously constitutes securing spring hardness in the mount axial direction without impairing the dust-proof dustproof characteristic of the mount radial direction.

Also, as another example of the prior art, a fluid enclosed engine mount structure is well illustrated in FIG.

Reference numeral 1 in the drawings refers to the mount bolt fixed to the engine side. The mount bolt 1 is fixed to the upper plate 2, and to the upper plate 2 is attached a dustproof rubber 3 which is compressed / expanded against vibration from the engine.

The anti-vibration rubber 3 is fixed to the upper end of the case 4 fixed to the vehicle body side. A decoupler 5 is provided inside the case 4 to partition the upper and lower spaces. The fluid 6 is sealed in the upper space of the decoupler 5. The fluid 6 is also sealed between the lower space of the decoupler 5 and the diaphragm 7.

The conventional fluid-filled engine mount thus constructed is canceled by vibrations from the engine reduced by compression / expansion of the anti-vibration rubber 3 and again through the fluid 6, the decoupler 5 and the diaphragm 7. It is delivered to the body.

In the above-described fluid-sealed engine mount of the prior art, the vibration and noise of the engine is absorbed and canceled depending on the elastic force and oil flow of the anti-vibration rubber, there is a problem that the effect is insignificant.

In addition, since the vibration absorption and offset functions are set in the prior art, it is difficult to proactively cope with vibrations caused by frequency components caused by the engine's driving state, that is, the rotation and explosion of the engine, while the vehicle is running. There is this.

Therefore, in the related art, it is a situation to be subjected to a certain degree of vibration and shock (vibration), thereby accompanied by a problem of deterioration of ride comfort and quietness.

The present invention has been proposed in order to solve the above-mentioned problems of the prior art, and is actively operated against vibrations and noises of engines that vary according to driving conditions, thereby suppressing vibrations and noises transmitted to the vehicle body. Make sure

1 is a cross-sectional view showing a fluid-filled engine mount of a typical vehicle.

2 is a sectional view showing an active engine mount of a motor vehicle according to the present invention;

Figure 3a, Figure 3b is an operating state diagram of the electric fluid constituting the active engine mount in the present invention.

Explanation of symbols on the main parts of the drawings

3: dustproof rubber 4: case

5: decoupler 8a: fluid chamber

8b: Fluid chamber 9: ER fluid

As a means for realizing the above object, the active engine mount of the present invention is characterized in that the inner space of the case is partitioned by a decoupler, and a solid to liquid or its as the current is applied to the upper and lower fluid chambers of the decoupler. Conversely, the ER fluid is changed and the technical configuration is configured to vary the fluidity of the ER fluid by applying a current to the decoupler.

Here, the decoupler is made of a conductor, in order to apply a current to the ER fluid. In addition, an electrical signal is applied to the decoupler from an electronic control unit (ECU) in which the operating state of the engine, that is, the engine speed is detected.

Accordingly, an electric field is formed in the upper and lower fluid chambers of the decoupler according to the operating state of the engine, and the stiffness of the mount is controlled by the ER fluid whose fluidity is changed by the electric field.

Therefore, according to the present invention, vibration and noise of the engine are accurately and actively suppressed.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment for implementing this invention is demonstrated in detail based on an accompanying drawing.

EXAMPLE

2 is an overall configuration diagram showing an active engine mount of a vehicle according to the present embodiment, and FIGS. 3A and 3B are operation state diagrams of the electric fluid constituting the active engine mount of the present embodiment.

In describing the present embodiment, the same reference numerals are used for the configuration of the present embodiment, which is the same as the drawings cited in the prior art, and will not be described again for clarity.

The active engine mount of the present embodiment is installed between the vehicle body F and the engine E, as mentioned in the prior art.

That is, in this embodiment, the mount bolt 1 fixed to the engine E side, the top plate 2 fixed to the mount bolt 1, and the top plate 2 fixed to the engine E, with respect to vibration from the engine And a dustproof rubber 3 that is compressed / expanded.

In addition, the dustproof rubber 3 is attached to the upper side to form a predetermined space therein, the case 4 fixed to the vehicle body side, the decoupler 5 provided inside the case 4, and It includes upper and lower fluid chambers 8a and 8b partitioned by the decoupler 5.

The ER fluid 9 is enclosed in the upper and lower spaces of the decoupler 5, in which the vibration of the engine is transmitted through the dustproof rubber 3 and the fluid 6, that is, the upper fluid chamber 8a and the lower fluid chamber 8b. do.

Here, the decoupler 5 is formed of a conductor, and receives an electric current applied by the ECU to form an electric field inside the upper and lower fluid chambers 8a and 8b. On the other hand, an amplifier for amplifying and supplying an electrical signal is provided between the ECU and the decoupler 5.

The ER fluid 9 is a material that changes from solid to liquid or vice versa as an electric current is applied, and maintains the state of FIG. 3A (state of liquid) when no electric field is formed, and FIG. 3B when an electric field is formed. It changes to the state of (solid state).

Based on this embodiment described above, the ECU controls the solid-liquid state of the ER fluid 9 by determining the engine driving state of the driving vehicle and changing the amount of current applied to the decoupler 5. do.

As a result, the ER fluid 8 changes the stiffness of the mount, thereby generating an appropriate elastic force according to the state of the engine, and suppresses vibration and noise transmitted to the vehicle body.

Through the embodiments described above, it can be seen that the active engine mount of the vehicle according to the present invention substantially solves the problems of the prior art.

That is, according to the present invention, it is possible to accurately and actively suppress various forms of vibration and noise generated from the engine.

Therefore, the present invention obtains the effect of improving the riding comfort and quietness of the vehicle.

On the other hand, the present invention is not limited to the above-described specific preferred embodiment, and any person having ordinary skill in the art to which the invention belongs without departing from the gist of the invention claimed in the claims, various modifications Would be possible.

Claims (2)

An upper plate fixed to the engine side, a dustproof rubber connected to the upper plate and compressed / expanded against the vibration of the engine, a case to which the dustproof rubber is fixed and mounted on the vehicle body, and a partition that divides the inner space of the case up and down. In an engine mount of an automobile comprising a coupler, an upper fluid chamber formed in a space between the upper plate and a decoupler, and a lower fluid chamber formed in a space between the decoupler and a diaphragm, the vehicle is mounted in the upper and lower fluid chambers. And a decoupler formed of a conductor to form an electric field in the upper and lower fluid chambers by receiving an electric current applied from an electronic control unit and an electric fluid that changes from a solid to a liquid or vice versa as an electric current is applied. Active engine mount for cars. The active engine mount of claim 1, wherein the electronic control unit applies a current to the decoupler through an amplifier by an algorithm set according to an operating state of the engine.