JP3071920B2 - Damping control method and device for vibration damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention can be used as a suspension for automobiles such as passenger cars and trucks, as well as a suspension for a bogie of a railway vehicle, a vehicle body vertical movement, a vehicle body roll prevention, and an industrial vibration isolator. The present invention relates to a damping control method and a damping device for a vibration damping device that can be used as a device, a vibration isolating device for a building structure, and the like.

[0002]

2. Description of the Related Art A liquid chamber partitioned by a partition member including a flexible member, an electrorheological fluid sealed in the liquid chamber, a throttle passage provided in the liquid chamber, and an electrode disposed in the throttle passage are formed. For example, Japanese Patent Laid-Open No. 63-2
Japanese Patent Application Laid-Open No. 65715 and JP-A-63-26623, all of which include a vibration damping device, a member on the upper side of the device, in other words, the direction of the vibration speed of the member on the vibration output side and its direction. When the vibration output side member and the member on the lower side of the device, in other words, the direction of the relative velocity with respect to the vibration input side member is the same direction, a high voltage is applied to the electrode, and the It increases the viscosity, thereby increasing the vibration damping force.

[0003]

However, in such a prior art in which the vibration damping force is controlled based only on the vibration speed, when the vibration damping force is applied, for example, as a suspension for an automobile, the vibration damping force of the device is reduced. Under the state where the force is large, for example, when the push-up vibration caused by the overhang of the protrusion is transmitted to the vibration input side member,
There is a disadvantage that the device transmits a large excitation force to the vibration output side member.

SUMMARY OF THE INVENTION The present invention has been made as a result of studying to solve such problems of the prior art, and an object of the present invention is to provide a vibration damping device in which the damping force is increased. It is an object of the present invention to provide a damping control method and a damping device for a vibration damping device capable of effectively preventing transmission of an exciting force in response to an input of a relatively large and abrupt vibration, such as a thrusting vibration or the like. .

[0005]

According to the present invention, there is provided a damping control method for a vibration damping device, wherein a liquid chamber is partitioned by a partition member including a flexible member, and an electrorheological fluid is sealed in the liquid chamber. A restrictor passage for allowing the flow of an electrorheological fluid is provided in the liquid chamber, and in a vibration damping device in which an electrode is disposed in the restrictor passage, a voltage applied to the electrode is adjusted to control a vibration damping force. In the mounting state of the vibration damping device, the upper member of the vibration damping device is being raised, and the upper member and the lower member of the vibration damping device are being displaced in a direction away from each other. In some cases, and when the upper member is descending and the upper and lower members are being displaced in directions approaching each other, the voltage applied to the electrodes is increased to increase the Phase of the viscosity of the viscous fluid On the other hand, when the absolute value of the vibration acceleration of the lower member exceeds a predetermined value, that is, when relatively large sudden vibration is input to the lower member, a high voltage is applied to the electrode. Even during the application of
This is to reduce the viscosity of the electrorheological fluid by reducing the voltage applied to the electrodes.

Here, more preferably, the application of a voltage to the electrode is performed in each of a vibration region in a frequency region sufficiently lower than the resonance frequency of the upper member and a vibration region in a frequency region sufficiently higher than the resonance frequency of the lower member. Stop. Further, the damping control device of the present invention provides a liquid chamber partitioned by respective face plates located at both end portions, a throttle passage constituting member located at an intermediate portion, and respective flexible members liquid-tightly connected to each of them. And an electrorheological fluid sealed in the liquid chamber, a throttle passage provided in the liquid chamber, and an electrode disposed in the throttle passage, wherein the vibration damping device is connected to a vibration output side member or a vibration input side member. Rigid members
The throttle passage is formed between the rigid member and the throttle passage component connected to the vibration input side member or the vibration output side member while being connected to the double-sided plate through the liquid chamber and the throttle passage constituent member. An acceleration sensor is attached to each of the vibration input side member and the vibration output side member, and these acceleration sensors are connected to one output determination circuit via respective integration circuits, and the acceleration sensor of the vibration input side member is connected. The output determination circuit is directly connected to the output determination circuit, and the output determination circuit is signal-connected to a high-voltage generation source that supplies a voltage to the electrodes. Here,
The detection of the relative speed between the vibration input side member and the vibration output side member can be performed in the output determination circuit, or by using a differential amplifier inserted between the output determination circuit and each integration circuit. You can also.

In this apparatus, it is more preferable that the integration circuit of the vibration input side member is provided at least for a vibration frequency higher than a specific frequency, and the integration circuit of the vibration output side member is provided at least for a vibration frequency lower than the specific frequency. Also function as filters that stop the output.

[0008]

According to the damping control method of the present invention, the upper member of the apparatus is being raised, and the upper member and the lower member are being displaced in a direction of separating from each other, and the upper member is being lowered. In each of the cases where the upper and lower members are being displaced in a direction approaching each other, the voltage applied to the electrodes is increased to increase the viscosity of the electrorheological fluid. Vibration can be effectively attenuated by increasing the vibration damping force in substantially the same manner.

On the other hand, under the condition that the vibration damping force of the device is large, a large vibration acceleration exceeding a predetermined value in the range of, for example, | 1.5 g | to | 3.0 g | Is applied, even when a high voltage is being applied to the electrode, the voltage applied to the electrode is sufficiently reduced to effectively reduce the vibration damping force, thereby causing the thrust vibration and other upward movement. Transmission to members can be effectively prevented, and these can be easily realized by the inventive device.

Incidentally, it is theoretically possible to obtain the respective velocities of the upper member and the lower member as integrated outputs of acceleration by using the apparatus of the present invention, and to control the vibration damping force based on the speed signals. Although it is effective, for example, if the integrated output of the long-wave swell of the road surface, or low-frequency acceleration generated at the time of transition from a horizontal road surface to a slope, the integrated output may be saturated,
In addition, control is performed on low-frequency vibrations that are not perceived as ride comfort. In any case, when higher-frequency vibrations in the perceived frequency range are input as composite inputs, the vibrations are sufficiently reduced. There is a problem that it cannot be attenuated. Furthermore, for high-frequency vibrations, the smaller the damping force, the better the vibration isolation effect. In addition, even if damping control is performed in a high-frequency range to deal with this, the control system and power supply Due to the time lag of the system and damping system,
There is a problem that an appropriate improvement of the vibration isolation effect cannot be expected.

Therefore, preferably, for each of the low-frequency vibration and the high-frequency vibration that cannot be felt, the application of the voltage to the electrode is stopped to minimize the vibration damping force, thereby obtaining a composite input. As described above, the damping ability for vibration input in the sensible frequency range is ensured, and the vibration isolation effect for high-frequency vibration is sufficiently ensured.

In the apparatus of the present invention, the respective vibration accelerations detected by the respective acceleration sensors of the vibration input side member and the vibration output side member are converted into respective vibration speeds by an integration circuit. The velocity vector and the relative displacement direction of the vibration output-side member and the vibration input-side member are obtained.Therefore, while the vibration output-side member is rising, the two members are displaced in a direction away from each other. In each case, when the vibration output side member is descending and both members are displaced in a direction approaching each other, a high voltage generation signal is output from the output determination circuit to the high voltage generation source. Is output.

As a result, the high voltage source increases the voltage applied to the electrodes, and the vibration damping force of the device is greatly increased. On the other hand, in cases other than the above cases, a low voltage generation signal or an output stop signal is output from the output determination circuit to the high voltage generation source to reduce the vibration damping force of the device as required. Bring.

Further, in this device, based on the output from the acceleration sensor of the vibration input side member directly connected to the output determination circuit, the vibration acceleration of the vibration input side member becomes a predetermined value, for example, | 2.0 g | If it exceeds, even if the vibration damping force is in an increased state, the output determination circuit outputs a low voltage generation signal or an output stop signal to the high voltage generation source to push up vibration or other vibration output side members. Effectively prevent transmission.

By the way, each integrating circuit also functions as a filter for stopping the output for each of a frequency higher than a specific vibration frequency and a frequency lower than the specific frequency, and an output determination circuit based on the stop of the output. Outputs an output stop signal to the high voltage source,
By stopping the application of voltage to the electrodes, under extremely low vibration damping force, as a composite input, sufficient damping performance against vibration input in the sensible frequency range is secured,
Ensures anti-vibration effect against high frequency vibration.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram illustrating a damping control device according to the present invention. In FIG. 1, reference numeral 1 denotes a vibration damping device, and reference numerals 2 and 3 denote a vibration input device and a vibration output device, respectively. The acceleration sensors are both shown in a schematic diagram.
Note that each of the acceleration sensors 2 and 3 can be provided on the mounting member side of the vibration damping device 1 instead of being mounted on the vibration damping device itself. Here, the respective acceleration sensors 2 and 3 are connected to respective integration circuits 4 and 5 to convert the respective vibration accelerations into vibration speeds, and the two integration circuits 4 and 5 are connected to one differential amplifier. 6 to one output determination circuit 7.

Here, the differential amplifier 6 calculates the relative speed between the vibration input side member and the vibration output side member and inputs the calculated relative speed to the output determination circuit 7, which outputs the relative speed signal and The output signal to the high voltage generator 8 is determined based on the speed signal of the vibration output member, that is, the speed vector signal, which is directly input from the integration circuit 5 of the vibration output member to the output determination circuit 7. . Here, the high voltage generation source 8 is connected to an electrode (not shown) provided in the vibration damping device 1 and functions to apply a required voltage to the electrode.

As the vibration damping device 1, for example, in addition to those disclosed in JP-A-63-265715 and JP-A-63-266237, those shown in FIG. 2 may be used. it can. In the vibration damping device 1 shown in a longitudinal sectional view in FIG. 2, one end of each of the two tubular flexible membranes 11 and 12 is
The other end portions of the tubular flexible membranes 11 and 12 are connected to the respective face plates 14 and 15 while being connected in a liquid-tight manner to the respective end portions of the throttle passage constituting member 13 having a substantially cylindrical shape as a whole. This is also a liquid-tight connection, so that both flexible membranes 11,
A single liquid chamber 16 in which the twelve folded portions face each other is formed. Inside the liquid chamber 16, a rigid member 17 penetrating through the throttle passage forming member 13 connects the respective face plates 14, 15 to each other. Link.

An electrorheological fluid 18 is sealed in such a liquid chamber, and the fluid 18 is supplied not only between the flexible membranes 11 and 12 but also between the throttle passage forming member 13 and the rigid member 17. Thus, the throttle passage 19 having a required cross-sectional area formed over substantially the entire length of the throttle passage constituent member 13 is also satisfied. In addition, mounting members 21 and 22 are provided on the face plate 14 and the throttle passage constituting member 13, respectively, so that the vibration damping device 1 can be mounted on required members. In the vibration damping device 1, the rigid member 17 forms a positive electrode connected to the high-voltage generating source 8, and the throttle passage forming member 13, and thus the mounting member 22 fixed thereto, are connected to the ground. Forming a negative electrode.

In actually applying such a vibration damping device 1, in addition to using it alone, it is also possible to use a combination of spring means. In the latter case, the vibration means is used as the spring means. , Metal springs such as coil springs, or
An air spring 23 as shown can be used.

The air spring 23 attaches the outer cylinder 24 to the face plate 14 side, and makes the cup-shaped portion 22a of the mounting member 22 function as an inner cylinder. Each end portion of the flexible sleeve 25 is airtightly connected, and the outward flange of the throttle passage member 13 provides a mutual communication between the cup-shaped portion 22a and the respective inner portion of the outer cylinder 24, for example, a plurality of. Through hole 13a
It is constituted by drilling.

Further, in the apparatus according to the present invention, the acceleration sensor 2 fixed to the vibration input side member, that is, the mounting member 22 shown in FIG. 2, is connected to either the integrating circuit 4 or the differential amplifier 6 as shown in FIG. Output determination circuit 7 without passing through
Is connected directly, and when the absolute value of the vibration acceleration detected by the acceleration sensor 2 exceeds the threshold value,
The output determination circuit 7 outputs to the high voltage generation source 8 a signal for reducing the voltage applied to the electrodes or for stopping the application.

The operation of the device configured as described above will be described below. Each of the vibration accelerations detected by each of the acceleration sensors 2 and 3 is converted into a vibration speed by each of the integration circuits 4 and 5, and the output signal from one of the integration circuits 5 is directly sent to the output determination circuit 7. At the same time, the differential amplifier 6 obtains the relative speeds of the respective oscillating velocities from the two integrating circuits 4 and 5, and the results are also input to the output determining circuit 7.

Here, the case where the vibration speed output from the integration circuit 5, that is, the vibration speed of the vibration output-side member changes as shown by a curve V _S with the upward speed being positive in FIG. When the relative speed obtained by subtracting the vibration speed output from the integration circuit 4 from the vibration speed V _S changes as shown by a curve V _rel in the figure,
When the vibration speed V _S is positive and the relative speed V _rel is positive, in other words, the vibration output side member has an upward speed, and the output determination circuit 7 And the vibration input side member is displaced in a direction away from each other, and the vibration velocity V _S is negative,
And when the relative speed V _rel is negative, in other words, when the vibration output side member has a downward speed, and furthermore, in the case where both members are displaced in the direction approaching each other, A predetermined high voltage output command is given to the high voltage generation source 8. On the other hand, when the above condition is not satisfied, the output determination circuit 7 supplies the high voltage
A predetermined low voltage output command including V is given.

The voltage pulse in FIG. 3 is a diagram illustrating this fact. When the above condition is satisfied, a predetermined high voltage applied to the electrode is set to V ₀ V, and otherwise, the voltage applied to the electrode is set to V ₀ V. The predetermined low voltage is set to 0V. Further, in addition to the above, the output determination circuit 7 also determines the vibration acceleration of the vibration input side member directly input thereto from the acceleration sensor 2 and the vibration acceleration is shown in FIG. When illustrated by the curve Au, if the absolute value of the vibration acceleration is greater than, for example, 2.0 g, the high voltage source 8 is being applied with a high voltage to the electrode, Also this is also 0
A predetermined low voltage output command including V is given.

The broken line portion in the voltage pulse in FIG. 3 illustrates this result. In the region where the vibration acceleration Au exceeds | 2.0 g |, even if a high voltage is being applied to the electrode. Since the applied voltage is immediately reduced to 0 V, and therefore the viscosity of the electrorheological fluid is effectively reduced, thrusting vibration and other transmission to the vibration output side member are extremely effectively prevented. become. That is, unless a broken line portion, in other words, a low voltage application portion is provided in the voltage pulse, the vibration acceleration of the vibration output side member is represented by a curve As in the figure.
As shown by the imaginary line portion, the vibration of the vibration input side member is
The transmission of the vibration can be sufficiently prevented by providing the broken line portion, which is almost directly transmitted to the output side member, as is clear from the solid line portion in the drawing.

Further, in this embodiment, each of the integration circuits 4 and 5 also functions as a filter so that the integration circuit 4 of the vibration input side member is sufficiently higher than, for example, the resonance frequency (10 to 15 Hz) of the vibration input system. In order to cut the output with respect to the vibration speed in the frequency domain (45 Hz or more), the integration circuit 5 of the vibration output side member is also provided with, for example,
For the vibration speed in a frequency range (0.5 Hz or less) sufficiently lower than the resonance frequency (1.0 to 1.5 Hz) of the vibration output system, the vibration is applied so as to cut the output. When there is no input signal, a high voltage vibration input can be absorbed by giving a voltage supply stop command from the output determination circuit 7 to the high voltage generation source 8, and at the same time, the sensible frequency range as a composite input is obtained. (Around 2-8Hz)
To exhibit a damping function against vibration input.

[0028]

As described above, according to the present invention, the vibration damping force of the device can be sufficiently increased as required, and particularly, steady vibration can be effectively reduced. For large vibrations,
Vibration transmission can be effectively prevented by reducing the vibration damping force.

When each of the integrating circuits also functions as a filter to cut off vibration in a frequency region sufficiently higher than the vibration input system and vibration in a frequency region sufficiently lower than the vibration output system,
The vibration isolation effect against high frequency vibration can be sufficiently enhanced, and bodily sensation vibration as a composite input can be effectively reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram illustrating an inventive device.

FIG. 2 is a longitudinal sectional view illustrating a vibration damping device.

FIG. 3 is a diagram showing a control state of a voltage applied to an electrode. DESCRIPTION OF SYMBOLS 1 Vibration damping device 2, 3 Acceleration sensor 4, 5 Integration circuit 6 Differential amplifier 7 Output judgment circuit 8 High voltage generation source

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-246817 (JP, A) JP-A-61-163011 (JP, A) JP-A-1-122718 (JP, A) 503023 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60G 17/015

Claims (4)

(57) [Claims] 1. A liquid chamber partitioned by a partition member including a flexible member, an electrorheological fluid sealed in the liquid chamber, a throttle passage provided in the liquid chamber, and an electrode disposed in the throttle passage. In the vibration damping device provided, in controlling the vibration damping force by adjusting the voltage applied to the electrode, the upper member of the vibration damping device is being lifted in the mounted state of the vibration damping device, and When the side member and the lower side member of the vibration damping device are being displaced in a direction away from each other, and when the upper side member is descending, the upper side member and the lower side member are mutually displaced. In each of the cases where displacement is in the approaching direction, while increasing the voltage applied to the electrodes to increase the viscosity of the electrorheological fluid, while the absolute value of the vibration acceleration of the lower member exceeds a predetermined value , Electric
A damping control method for a vibration damping device, characterized in that a voltage applied to an electrode is reduced to reduce the viscosity of an electrorheological fluid even during application of a high voltage to a pole . 2. Vibration velocities in a frequency region sufficiently lower than a resonance frequency of the upper member and a frequency region sufficiently higher than a resonance frequency of the lower member,
2. The attenuation control method according to claim 1, wherein the application of the voltage to the electrode is stopped. 3. Each face plate located at both ends, an intermediate portion
Passage constituent members located in the section and their respective parts
A liquid chamber partitioned by respective flexible members liquid-tightly connected thereto, an electrorheological fluid sealed in the liquid chamber, a throttle passage provided in the liquid chamber, and an electrode disposed in the throttle passage. The vibration damping device comprises a rigid member connected to the vibration output side member or the vibration input side member.
Through the liquid chamber and the restrictor passage member.
Connected to the face plate, its rigid member and vibration input side
Throttle passage connected to the member or vibration output side member
The diaphragm passage is formed between the vibration input side member and the vibration input side member and the vibration output side member, and acceleration sensors are attached to the vibration input side member and the vibration output side member, respectively, and these acceleration sensors are connected to one output determination circuit via respective integration circuits. As well as
An acceleration sensor of a vibration input side member is directly connected to an output determination circuit thereof, and the output determination circuit is signal-connected to a high voltage generation source that supplies a voltage to the electrodes. Control device. 4. The output of the integration circuit of the vibration input side member is stopped at least for a vibration frequency higher than a specific frequency, and the output of the integration circuit of the vibration output side member is stopped at least for a vibration frequency lower than the specific frequency. 4. The attenuation control device according to claim 3, wherein the attenuation control device also functions as a filter.