KR20050022183A - Ariable control engine mount and method for controlling thereof - Google Patents

Abstract

PURPOSE: An active control engine mount and a control method thereof are provided to damp vibration by making each length of first and second orifices for connecting main and sub fluid chambers different and to reduce vibration for traveling and road conditions such as a non-amplified high frequency area by an actuator. CONSTITUTION: Main rubber(4) is stuck at a lower end of a core(18) mounted in an engine. A diaphragm(6) is attached around the upper end of the core to generate hydraulic pressure of filled fluid. A block body(8) communicates with a sub fluid chamber(22) formed by the main rubber and the diaphragm, has a main fluid chamber(20) filled with fluid, and comprises first and second orifices(24,26). The first orifice is composed of a first upper passage(34) formed at an upper block(28) to communicate with the sub fluid chamber and a first middle passage(40) communicating with the first upper passage and having an opening and closing valve(12) disposed at one end to control the flow of fluid of the main fluid chamber by a driving unit(38). The second orifice is composed of a second upper passage(36) formed on the upper block to communicate with the sub fluid chamber; a second middle passage(42) disposed in a middle block(30) to communicate with the second upper passage; and a lower passage(44) horizontally formed to communicate with the second middle passage and to flow the fluid of the main fluid chamber all the time. An actuator(10) is mounted at a vehicle body to transmit vibration to a membrane(46) disposed in the lower end of the block body by an actuator bracket(48). The opening and closing valve variably opens or closes the first orifice of the block body by the driving unit. An electronic control unit(16) is electrically coupled with the driving unit to control the driving unit by detecting an electrical signal of an engine rpm sensor(14) with pre-set information.

Description

Variable Control Engine Mount and Control Method {ARIABLE CONTROL ENGINE MOUNT AND METHOD FOR CONTROLLING THEREOF}

The present invention relates to a variable control engine mount and a control method thereof, and more particularly, by varying the engine mount by setting the frequency (engine rotational speed) according to the vibration of the engine generated during starting of the vehicle, idling or driving. The present invention relates to a variable control engine mount and a method of controlling the same, which reduce the vibration of the engine transmitted to the vehicle to block noise transmission to the vehicle, thereby enabling comfortable quiet driving.

In general, the engine mount is aimed at preventing vibration from being transmitted from the engine to the vehicle body, isolating the vibration mode of the vehicle, and controlling the movement of the engine.

The main performance goal of an engine mount is to make it statically strong to minimize engine movement and to be flexible dynamically to isolate high frequency vibrations.

The engine mount developed in Korea is mainly applied to the fluid engine mount because the insulation method between the engine and the vehicle is passive, and the vibration characteristics of the vehicle can be improved because the rigidity can be given by separating the static and dynamic requirements from each other. It offers improved performance over rubber-type engine mounts.

However, in recent years, the quietness and noise of the driver's vehicle require more performance on the NVH (Noise Vibration Harshness) characteristics. It is being applied.

The frequency domain and the direction of generation are different for each vibration and noise generated in the engine and the vehicle. Therefore, it is very important to decouple the vibration generation between them and to attenuate each mode.

However, the current engine mount system is unable to attenuate the entire area of the vehicle's vibration generation mode, and the NVH performance of the vehicle is improved by separating the low frequency and high frequency sections from each other and appropriately damping the vibration, but there is a limitation in performance.

There is a demand for development of an electronically controlled hydro engine mount that enables attenuation of all modes.

In general, the engine mount does not attenuate the engine vibration according to the driving conditions or the vehicle conditions because its vibration damping characteristics are constant. Therefore, vibration and noise deteriorate during idle rotation or constant speed driving, and engine torque fluctuations during acceleration or deceleration. There was a problem that tremor occurs.

In other words, vibration and noise deteriorate due to an excessively large absolute spring constant during idle rotation or constant speed driving, and the ride comfort of the vehicle decreases due to the vibration attenuation of the engine mount being insufficient due to engine torque fluctuations during acceleration or deceleration of the vehicle. There was a problem.

In order to solve the problems of the conventional general engine mount as described above, FIGS. 1 and 2 are diagrams showing an electronic control engine mount and its operating state as an example according to the related art.

The electronically controlled engine mount includes two flow holes between the pour chamber 4 and the pour chamber 4 in order to quickly cope with engine vibrations that are changed according to vehicle conditions or driving conditions to provide an optimum ride comfort. (7) A circular first orifice (6) formed at a position where the (8) is symmetrical with each other is embedded, and a separate rotary shaft (23) is inserted into the side portion of the first orifice (6), and the end of the rotary shaft (23) In the engine mount is provided with a disc-shaped opening and closing plate 24, the drive unit 25 for generating a rotational force at one end of the rotary shaft 23,

A circular second orifice 20 is formed inside the first orifice 6, and the flow holes 21 and 22 are respectively formed at positions opposite to each other at the upper and lower ends of the second orifice 20. The cross-sectional area of the second orifice 20 is made smaller than the cross-sectional area of the first orifice 6.

On the other hand, as a means for controlling the opening and closing operation of the opening and closing plate 24, the change amount of the traveling speed by using the speed sensor 30 for detecting the traveling speed of the vehicle and the traveling speed data detected by the speed sensor 30 And a switching control unit 31 for outputting a control signal for turning on the switch 32 when the amount of change in the traveling speed is equal to or greater than a predetermined amount, and operating on by the control signal of the switching control unit 31. A switch 32 for supplying the battery 33 voltage to the electromagnet 21 is configured to automatically control the opening and closing operation of the opening and closing plate 27.

The operation of the electronic control engine mount described above;

First, since the driving speed change amount of the vehicle detected by the speed sensor 30 does not occur during idle rotation or constant speed driving, the switching controller 31 turns off the switch 32 so that the battery 33 voltage is driven by the driver 25. Since the opening and closing plate 24 is horizontally maintained at the center of the first orifice 6 as shown in FIG. 2, the first orifice 6 is opened.

Accordingly, when the volume of the injection chamber 4 shrinks due to relatively small engine vibration generated during idle rotation or constant speed driving, the fluid in the injection chamber 4 flows through the flow holes 7 and 8 and the first orifice 6. At the same time, it is moved to the liquid-liquid chamber 5 at the same time, and is also moved to the liquid-liquid chamber 5 through the flow holes 21 and 22 and the second orifice 20.

As described above, when the fluid in the injection chamber 4 moves to the subdivision chamber 5 through the first orifice 6 and the second orifice 20, the space of the entire orifice 6, 20 becomes wider. Accordingly, the fluid resistance is reduced, so that the engine vibration generated finely during idle rotation or constant speed driving is effectively attenuated.

On the other hand, when the amount of change in the vehicle traveling speed detected by the speed sensor 30 is detected to be above a certain value, the switching controller 31 turns on the switch 32 as the amount of change in the vehicle running speed occurs above a certain value. The battery 33 voltage is supplied to the driver 25 through the switch 32.

As described above, when a predetermined voltage is input to the driving unit 25, the driving unit 25 drives to generate a predetermined rotational force so that the rotating shaft 23 rotates about 90 °, and the rotating shaft 23 rotates 90 °. As a result, the opening and closing plate 24 also rotates by 90 ° so that the opening plate 24 is vertically present inside the first orifice 6 as shown in FIG. 3 to block the first orifice 6.

Accordingly, when a relatively large engine vibration generated during deceleration or acceleration of the vehicle is applied to the pouring chamber 4, the fluid in the pouring chamber 4 flows into the flow holes 21, 22 and the second orifice 20. It is to be moved to the liquid-liquid chamber (5) through.

That is, when a relatively large engine vibration generated due to a change in engine torque when the vehicle decelerates or accelerates is applied to the injection chamber 4, the fluid moves to the injection chamber 5 only through the second orifice 20, so that the fluid Increasing the resistance force effectively attenuates relatively large engine vibrations.

In other words, when a relatively large engine vibration occurs, the volume of the overall orifice is reduced to drive the drive unit 25 to increase the fluid resistance so that the opening and closing plate 24 blocks the first orifice 6, The fluid in the injection chamber 4 is moved to the subdivision chamber 5 through only the second orifice 20.

In addition, when a relatively small engine vibration occurs, the volume of the overall orifice is increased so that the first orifice 6 is opened by cutting off the power supplied to the driving unit 25 so as to reduce the fluid resistance. The fluid of 4) is caused to move to the liquid-liquid chamber 5 through the first orifice 6 and the second orifice 20.

In the above-described conventional technique, an opening or closing plate that is automatically controlled is installed in a first orifice, which is a fluid flow path between a liquid filling chamber and a liquid filling chamber, to restrict or easily flow a fluid to cope with engine vibration that is changed according to a vehicle condition or a driving condition. Although it aims to improve ride comfort, it has a characteristic of attenuating vibration only in a specific frequency band when vibrating, thus failing to adequately attenuate the vibration of various frequency bands, and thus, there is a problem in that absorption ability is reduced for various vibration noises.

In order to solve the problems of the prior art made as described above, the purpose of the present proposal is to mutually connect the on-off valve and the actuator of the engine mount according to the information set by the electronic control unit according to the change of the frequency domain generated by the engine operation. Complementary operation is to provide a variable control engine mount and its control method that can provide the optimum ride comfort by automatically controlling to block the vibration generated appropriately according to the starting, idling, driving conditions of the vehicle.

The present invention for realizing this

The main rubber is attached to the bottom of the core mounted on the engine in a certain shape,

A diaphragm attached around the top of the core and configured to generate a hydraulic pressure of the filled fluid;

A block body in communication with the liquid-liquid chamber formed by the main rubber and the diaphragm to form a liquid-liquid chamber filled with a fluid in a lower portion thereof to form first and second orifices;

An actuator installed in the vehicle body to transmit vibration to the membrane interposed by an actuator bracket at the bottom of the block body;

An opening / closing valve installed to open and close the first orifice formed in the block body variably by a driving unit;

It is to provide a variable control engine mount consisting of a configuration including an electronic control unit that is electrically connected and installed to recognize and control the electrical signal of the engine speed sensor by the predetermined information to the drive unit.

The block body is located at the edge of the main rubber and the diaphragm is attached to the upper block to form a first and second upper flow path in communication with the liquid chamber,

A first intermediate passage having an opening / closing valve controlled by a driving unit and stacked on the bottom in communication with the first and second upper passages of the upper block, and an intermediate block having a second intermediate passage formed at one side thereof;

The second control channel is formed in communication with the second intermediate flow path of the intermediate block to provide a variable control engine mount consisting of a lower block is placed on the membrane while being stacked on the bottom.

The first orifice is a first upper flow path formed in the upper block in communication with the liquid-liquid chamber, and a first valve having an opening and closing valve for controlling the flow of the liquid-liquid chamber fluid by the drive unit at one end while being formed in communication with the first upper flow path. It is to provide a variable control engine mount formed by forming an intermediate passage.

The second orifice has a second upper flow path formed in the upper block in communication with the subdivision chamber, a second intermediate flow path formed in the intermediate block so as to communicate with the second upper flow path, and horizontally constant in communication with the second intermediate flow path. It is to provide a variable control engine mount formed by the length to form a second lower flow path to enable the constant flow of the fluid in the fluid chamber.

If the engine vibration frequency (speed) at the start of the vehicle is a shake mode (shake mode) of 3 ~ 10Hz (90 ~ 300rpm), the step of controlling the shut-off valve off and (S10) engine vibration frequency (speed) after starting the vehicle If the idle mode is 20 ~ 30Hz (600 ~ 900rpm) (idle mode) to control the opening of the on and off valve on,

Engine vibration frequency (speed) during driving is 35 ~ 50Hz (1050 ~ 1500rpm), 70 ~ 90Hz (2100 ~ 2700rpm), 100 ~ 200Hz (3000 ~ 6000rpm), 400 ~ 800Hz (12000 ~ 24000rpm), 800 ~ 1200Hz ( 24000 ~ 36000rpm) to provide a control method of a variable control engine mount, characterized in that it is controlled by the step of controlling the opening control of the on-off valve and the actuator operation when it corresponds to each.

According to the present invention, an initial oscillation frequency band of the engine at startup is 3 to 10 Hz (90 to 300 rpm) as a shake mode, and the electronic control device having the setting information controls the driving unit to control the first orifice and the first intermediate channel as an on-off valve. By blocking the fluid flow in the liquid-liquid chamber or the liquid injection chamber through the first orifice, and the fluid flow between the liquid-liquid chamber or the liquid-liquid chamber through only the second orifice to exhibit a damping force to the vibration.

In the idle mode in which the engine is idling, the frequency band of vibration is 20 to 30 Hz (600 to 900 rpm). In this case, the electronic control device controls the driving unit to shut off the first intermediate flow path of the first orifice. By turning off the opening, the fluid flow between the injection chamber and the injection chamber through the first and second orifices is enabled, thereby increasing the damping force against vibration.

The vibration frequency (speed) during the high-speed driving of the vehicle is 35 to 50 Hz (1050 to 1500 rpm), 70 to 90 Hz (2100 to 2700 rpm), 100 to 200 Hz (3000 to 6000 rpm), 400 to 800 Hz (12000 to 24000 rpm), When the electronic control device detects the high frequency range of 800 ~ 1200Hz (24000 ~ 36000rpm) by the set information, the on / off valve is turned on to enable the flow of fluid through the first and second orifices, and the actuator is also operated by the set information. To increase the damping force against vibration as much as possible.

In addition, as well as the flow through the orifice of the fluid in accordance with the operation of the on-off control valve, it is possible to implement a widely used active control mount by operating the actuator at the start and idling as well as the multiple control.

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

3 is a view showing a variable control engine mount according to the present invention, Figure 4 is a block diagram showing a control method of a variable control engine mount according to the present invention.

The variable control engine mount 2 is largely adapted to recognize signals from the main rubber 4, the diaphragm 6, the block 8, the actuator 10, the opening / closing valve 12, and the engine speed sensor 14. It consists of the electronic control apparatus 16, and is comprised.

The main rubber 4 repeatedly transmits and compresses the engine to the upper part of the engine mount when the high amplitude vibration or the low amplitude vibration of the large amplitude appears in the engine while the engine is started or the vehicle is running. It is attached to the bottom of the core 18 to be mounted on.

Whenever the main rubber 4 is compressed, the space cross-sectional area of the injection chamber 20 is instantaneously contracted.

The diaphragm 6 expands while the expansion action is not simply inflated but exhibits expansion resistance, so that the liquid-liquid chamber 22 is formed to resist the inflow of fluid, and this resistance is the engine mount, that is, the injection chamber 20. It is attached to the upper periphery of the core 18 to attenuate the vibration energy transmitted to the () is formed to generate the hydraulic pressure of the filled fluid.

The block body 8 is assembled by a conventional technique to form a liquid injection chamber 20 in which fluid is filled in the lower portion while communicating with the liquid injection chamber 22 formed by the main rubber 4 and the diaphragm 6. 2 orifices 24, 26 are formed.

The block 8 is composed of an upper block 28, an intermediate block 30, and a lower block 32. As shown in FIG.

The upper block 28 is formed at the edge of the main rubber 4 and is attached to the diaphragm 6 to form first and second upper flow passages 34 and 36 in communication with the sub-liquid chamber 22.

The intermediate block 30 is first intermediated with an on / off valve 12 controlled by the drive unit 38 while being laminated to the bottom in communication with the first and second upper flow paths 34 and 36 of the upper block 28. The second intermediate flow passage 42 is formed on one side of the flow passage 40.

The lower block 32 forms a second lower channel 44 in communication with the second intermediate channel 42 of the intermediate block 30 and is disposed on the membrane 46 while being stacked at the bottom.

The first orifice 24 has a first upper flow passage 34 formed in the upper block 28 so as to communicate with the subdivision chamber 6, and a liquid injection chamber at one end thereof so as to communicate with the first upper flow passage 34. (20) The first intermediate passage 40 is provided with an on-off valve 12 for controlling the flow of the fluid by the drive unit 38.

The second orifice 26 is a second upper oil passage 36 formed in the upper block 28 in communication with the subdivision chamber 6, and an intermediate block 30 in communication with the second upper oil passage 36. The second intermediate flow passage 42 formed in the cross-section) and the second intermediate flow passage 42 in a horizontal direction in a horizontal direction in communication with the second intermediate flow passage 42 to form a second lower flow passage 44 to enable continuous flow of the liquid in the fluid of the injection chamber. Is done.

The actuator 10 is installed on the vehicle body with an actuator bracket 48 at the lower end of the block body 8, and is mounted between the block body 8 and the actuator bracket 48 while mounting the membrane 46 on the actuator shaft 50. I install it intervening.

The on-off valve 12 is provided to variably open and close the first orifice 24 formed on the block 8 by the drive unit 38.

That is, the opening / closing valve 12 is assembled to the first intermediate passage 40 forward and backward by the signal of the electronic controller 16 to control the flow of the fluid.

The electronic controller 16 detects the engine 38 by the engine speed sensor 14 when a high frequency vibration of a low amplitude or a low amplitude vibration of a large amplitude appears in the engine while the engine is started. It is made to be electrically connected to control by the set information.

Referring to the operation of the present invention made as described above, when the start-up generates a low frequency vibration of the initial large amplitude of the engine, which is called a shake mode with a frequency band of 3 ~ 10Hz (90 ~ 300rpm), this is the engine speed The electronic controller 16, which is detected through the detection sensor 14, controls the driving unit 38 to block the first intermediate passage 40 of the first orifice 24 (S10) to open / close the valve 12. Control off.

Accordingly, the fluid flow of the liquid-liquid chamber 22 or the liquid-liquid chamber 20 is blocked through the first orifice 24 of the variable control engine mount 2, and the liquid-liquid chamber 20 or the liquid-liquid solution is blocked only through the second orifice 26. It enables fluid flow between the seals 22 to exert a damping force against vibrations.

Then, in the idle mode in which the engine idles (idle mode), when the vibration frequency band of the engine reaches 20 to 30 Hz (600 to 900 rpm), the electronics recognized by the information set through the engine speed sensor 14 The controller 16 controls the driver 38 by the set information.

Accordingly, the injection chamber 20 is turned on through the first and second orifices 24 and 26 by turning on and off the opening / closing valve 12 that blocks the first intermediate flow passage 42 of the first orifice 24. Or fluid flow between the subdivision chambers 22 is used to exert damping force against the idling vibration of the engine, resulting in quiet idling.

When the vehicle is driven at a high speed on the highway after idling of the engine, the vibration of the engine generates an unamplified high frequency. At this time, the engine vibration frequency (speed) is 35 to 50 Hz (1050 to 1500 rpm) and 70 to 90 Hz (2100 to 2700rpm), 100 ~ 200Hz (3000 ~ 6000rpm), 400 ~ 800Hz (12000 ~ 24000rpm), 800 ~ 1200Hz (24000 ~ 36000rpm) is formed by the engine speed sensor 14, the electronic control device (16) ) Is detected by the set information.

Accordingly, the electronic controller 16 turns on the shut-off valve 12 to enable the flow of the fluid through the first and second orifices 24 and 26 and the actuator 10 is also operated by the set information. (S30) Increase the damping force to the vibration as much as possible.

The operation of the actuator 10 causes the membrane 46 to generate a shaking action to offset the unamplified high frequency to effectively attenuate the short and repeated vibrations so as to quietly run, thereby reducing the fatigue of the passenger or the driver. Let's do it.

In addition, as well as the flow through the first and second orifices 24 and 26 of the fluid according to the ON operation of the on-off control valve 12, the actuator 10 is operated at the time of starting and idling, thereby performing multiple control. It is also possible to implement a widely used active control mount.

In the large amplitude low frequency region generated at the start of the vehicle or during acceleration and deceleration, the fluid of the injection liquid chamber 20 is formed in the block 8 to pass through the first orifice 24 which is blocked, and is formed to have a long length. The flow is caused to flow along the orifice 26 so as to flow with the subdivision chamber 22 to damp vibration.

In addition, when driving on a road with a good road surface such as a highway, the engine generates vibrations of unamplified high frequency, in which the length of the fluid in the liquid injection chamber 20 is opened as well as the short first orifice 24 opened by the opening / closing valve 12. In addition to the long second orifice 26, the electronic controller 16 operates the actuator 10 to operate the membrane 46 according to the setting information according to the change of the high frequency (rotational speed). By offsetting the damping vibration, it is possible to maintain a comfortable in-vehicle environment and to drive.

As described above, the present invention provides vibration damping by varying the lengths of the first and second orifices connecting the injection chamber and the auxiliary liquid chamber of the engine mount, and is equipped with an actuator, and the driving conditions and the road conditions of the vehicle such as the non-amplitude high frequency region. This technology effectively attenuates vibration even under

In other words, the vibration of the engine is transmitted to the vehicle body, and the fluid in the engine mount is variably opened in the first orifice according to the set information, thereby attenuating the vibration and delicately even the high frequency of the non-amplitude that can be passed by the actuator operation. The damping control improves the ride comfort of the vehicle, reduces fatigue of the driver and secures the reliability of the technology.

1 shows an electronically controlled engine mount according to the prior art;

2 is a view showing the operation of the electronic control engine mount according to the prior art.

3 illustrates a variable control engine mount in accordance with the present invention.

4 is a block diagram showing a control method of a variable control engine mount according to the present invention;

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

2: Variable control engine mount 4: Main rubber

6: Diaphragm 8: Block body

10: Actuator 12: Opening and closing valve

14: engine speed sensor 16: electronic controller

18: Core 20: Pouring room

22: wealth room 24, 26: 1st, 2 orifice

28: upper block 30: middle block

32: Lower block 34, 36: First and second upper flow passages

38: drive part 40, 42: first and second intermediate euros

44: second euro 46: membrane

48: Actuator Bracket 50: Actuator Shaft

Claims (3)

The main rubber is attached to the bottom of the core mounted on the engine in a certain shape, A diaphragm attached around the top of the core and configured to generate a hydraulic pressure of the filled fluid; The fluid flows into the liquid chamber fluid at one end while being in communication with the liquid-liquid chamber formed by the main rubber and the diaphragm to form a liquid-liquid chamber filled with fluid at the lower portion thereof so as to be in communication with the liquid-liquid chamber to communicate with the first upper flow channel formed at the upper block. In communication with the second orifice formed in the intermediate block in communication with the second orifice formed in the upper block and in communication with the first orifice and the liquid-liquid chamber in which the first intermediate channel is provided with an on-off valve controlled by the drive unit. A block body formed horizontally to a certain length to form a second orifice in which a second lower flow path is formed to enable continuous flow of the fluid in the liquid chamber; An actuator installed in the vehicle body to transmit vibration to the membrane interposed by an actuator bracket at the bottom of the block body; An opening / closing valve installed to open and close the first orifice formed in the block body variably by a driving unit; Variable drive engine mount, characterized in that the drive unit comprises an electronic control unit that is electrically connected and installed to recognize and control the electrical signal of the engine speed sensor by the predetermined information. The upper block of claim 1, wherein the block body is positioned at an edge of the main rubber and has a diaphragm attached thereto to form first and second upper flow paths in communication with the sub-liquid chamber; A first intermediate passage having an opening / closing valve controlled by a driving unit and stacked on the bottom in communication with the first and second upper passages of the upper block, and an intermediate block having a second intermediate passage formed at one side thereof; A variable control engine mount, characterized in that the lower block is formed in communication with the second intermediate channel of the intermediate block is formed on the membrane while being stacked on the bottom. If the engine vibration frequency (speed) at the start of the vehicle is in the shake mode (shake mode) of 3 ~ 10Hz (90 ~ 300rpm) step of controlling the shut-off valve to turn off (S10), If the engine vibration frequency (speed) after starting the vehicle is in the idle mode (idle mode) of 20 ~ 30Hz (600 ~ 900rpm) (S20) and the opening control valve opening on, When driving a vehicle, the engine vibration frequency (speed) is 35 to 50 Hz (1050 to 1500 rpm), 70 to 90 Hz (2100 to 2700 rpm), 100 to 200 Hz (3000 to 6000 rpm), 400 to 800 Hz (12000 to 24000 rpm), 800 to 1200 Hz ( 24000 ~ 36000rpm) variable control engine mount control method, characterized in that the control in the step (S30) for controlling the opening control and the actuator operation of the on-off valve.