JP2827706B2 - Control type anti-vibration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control type vibration damping device for reducing vibration transmitted from a vibration source, and more particularly, to a vibration reduction device provided on a vibration transmission path on a side opposite to a vibration source. An apparatus capable of actively reducing the transmitted vibration by controlling the vibration reducing means in accordance with the vibration level, so that a good vibration-proof effect can be obtained over a wide frequency band.

[0002]

2. Description of the Related Art As a device for supporting a vibrating body such as an engine on a vehicle body or the like, in addition to a passive vibration isolator made of an elastic body or the like,
Many anti-vibration devices that actively reduce vibration have been proposed. For example, in the vibration damping device described in Japanese Patent Application Laid-Open No. 60-192141, a fluid chamber is formed in an elastic body interposed between a vibration side and a support side, and the fluid chamber and a sub-fluid chamber having a variable volume are formed. Communicating through an orifice, and
Fluid is sealed in the fluid chamber and the sub-fluid chamber, and the vibration is reduced by a damping force due to the movement of the fluid between the fluid chamber and the sub-fluid chamber through the orifice with respect to a low-frequency vibration input.

Further, in this conventional prevention device,
A part of the fluid chamber is composed of a piezoelectric ceramic plate,
The piezoelectric ceramic plate is bent and vibrated in response to the high frequency vibration generated in the vibration source so that the volume fluctuation of the fluid chamber due to the high frequency vibration input is absorbed, so that the fluid in the orifice becomes a stick state. The transmission vibration at the time of input was reduced.

[0004]

Indeed, according to the above-mentioned conventional vibration isolator, the above-mentioned action is exerted on a vibration input. Therefore, the vibration transmission path in which the vibration isolator is provided. Can be reduced, but when the vibration generated by the vibration source is transmitted to a predetermined evaluation position (for example, the foot or ear position of the occupant) through a plurality of vibration transmission paths, Just because the vibration transmitted through one vibration transmission path is reduced does not necessarily mean that the vibration at the evaluation position (for example, the vehicle body vibration at the foot of the occupant, the muffled sound at the occupant's ear position) is also reduced.

That is, when the engine is supported on the vehicle body by a plurality of engine mounts, the vibration transmitted from the engine to the evaluation positions such as the feet and ears of the occupant is a combination of the vibrations transmitted through the engine mounts. Therefore, it can be considered as a vector sum. For example,
When the engine is supported on the vehicle body by three engine mounts, when vibration of a certain frequency is input, as shown in FIG. 7, vibrations transmitted to predetermined evaluation positions through the engine mounts are vectors v ₁ , v ₂ and v. if that is _three like, the vibration at the evaluation position is those synthesized vector V ₀ which vectors v ₁ to v _3.

When the vector v ₁ is ideally reduced to zero by the active vibration isolator described above,
Resultant vector V ₀ is the result of approaching the vector v _2, the resultant vector V ₀ is the increased. In other words, even if the anti-vibration device operates accurately and good anti-vibration characteristics are obtained in a closed loop near the anti-vibration device, the composite vector V ₀ will increase, and the deterioration of the vibration level at the evaluation position will be worsened. You may be invited.

FIG. 8 is a graph showing the sound pressure level at the position of the occupant's ear with respect to the engine speed. The control is executed by the active vibration isolator (control ON) and the control is not executed (control). OFF). That is, according to this, in the region lower than the rotation speed N _{1 and in} the region between the rotation speed N ₂ and the rotation speed N ₃ , the sound pressure level at the occupant ear position can be reduced by executing the control. possible, in the region, as well as higher than the rotational speed N ₃ region between extending from the rotational speed N ₁ to the rotational speed N _2, it can be seen that rather the sound pressure level has deteriorated by executing the control.

In order to solve such a problem, it is conceivable to operate the vibration isolator on the basis of the vibration at the evaluation position. However, in this case, the transmission system from the control position to the evaluation position is also required. Because it is necessary to take into account control
The control unit becomes complicated, and good results are not always obtained.
In addition, the cost is increased. The present invention has been made by focusing on the unresolved problems of the conventional technology, and without inviting a complicated control device.
It is an object of the present invention to provide a control type vibration damping device capable of obtaining a good vibration damping effect over a wide frequency band.

[0009]

According to a first aspect of the present invention, there is provided a control type vibration isolator according to the first aspect of the present invention, wherein a predetermined evaluation position at which vibration is transmitted from a vibration source through a plurality of vibration transmission paths. Evaluation position vibration detecting means for detecting the vibration of the vibration, vibration reducing means disposed on at least one of the plurality of vibration transmitting paths, and detecting the vibration on the evaluation position side of the vibration reducing means. Path vibration detecting means, a vibration reduction control means for controlling the vibration reducing means so as to reduce the vibration detected by the path vibration detecting means, and a frequency detecting means for detecting a frequency of the vibration generated by the vibration source. A determination unit that determines whether the vibration detected by the evaluation position vibration detection unit is worse after control is executed than before control is performed by the vibration reduction control unit. A frequency storage means for storing the frequency the frequency detecting unit detects when it is determined that that,
Control prohibiting means for prohibiting the control of the vibration reduction control means when the vibration of the frequency stored in the frequency storage means is occurring.

According to another aspect of the present invention, there is provided a control type vibration isolator for detecting vibration at a predetermined evaluation position to which vibration is transmitted from a vibration source through a plurality of vibration transmission paths. Evaluation position vibration detection means, vibration reduction means disposed on at least one of the plurality of vibration transmission paths, and path vibration detection for detecting vibration on the evaluation position side of the vibration reduction means. Means, a vibration reduction control means for controlling the vibration reduction means so that the vibration detected by the path vibration detection means is reduced, and a frequency detection means for detecting the frequency of the vibration generated in the vibration source,
Determining means for determining whether or not the vibration detected by the evaluation position vibration detecting means after execution of the control of the vibration reduction control means is equal to or higher than a predetermined level; and determining whether the vibration is equal to or higher than the predetermined level. Frequency storage means for storing the frequency detected by the frequency detection means, and control prohibition means for prohibiting the control of the vibration reduction control means when the vibration of the frequency stored in the frequency storage means has occurred, With.

According to a third aspect of the present invention, in the control type vibration isolator according to the first or second aspect, a plurality of evaluation positions are selected, and an evaluation position vibration detecting means is provided for each of the evaluation positions. The determination means is provided for performing a predetermined determination based on a value of a predetermined evaluation function using the vibration of each evaluation position detected by the plurality of evaluation position vibration detection means as a variable.

Further, according to a fourth aspect of the present invention, in the control type vibration isolator according to the third aspect, a weighting factor setting for setting a weighting factor of vibration at each evaluation position based on the frequency detected by the frequency detecting means. With means. Claim 5
According to the invention described above, the control type vibration damping device according to any one of claims 1 to 4 is applied to a vehicle, wherein the vibration source is an engine, and the evaluation position vibration detecting means detects the occupant's ear position as vibration. Detect nearby muffled sounds.

[0013]

According to the first aspect of the present invention, the path vibration detecting means detects the vibration on the evaluation position side of the vibration reducing means, and the vibration reducing control means controls the vibration reducing means so as to reduce the vibration. Therefore, the vibration transmitted through the vibration transmission path provided with the vibration reducing means is reduced.

On the other hand, the vibration at the predetermined evaluation position is detected by the evaluation position vibration detecting means, and the judging means detects the vibration detected by the evaluation position vibration detecting means after the execution of the control compared to before the control of the vibration reduction control means. Is determined to be worse, the frequency of the vibration at that time is stored in the frequency storage means. Therefore, if the vibration transmitted through the vibration transmission path is reduced by the vibration reducing unit when the vibration having the frequency stored in the frequency storage unit is generated, the vibration at the evaluation position does not operate the vibration reducing unit. It will be worse on the contrary.

Therefore, when the control prohibiting means prohibits the control of the vibration reduction control means when the vibration of the frequency stored in the frequency storage means is generated, the vibration transmission path provided with the vibration reduction means is provided. However, the vibration itself transmitted at the evaluation position cannot be reduced, but the deterioration of the vibration at the evaluation position is prevented. When the vibration having a frequency other than the frequency stored in the frequency storage means is generated, the control prohibition means does not particularly prohibit the control of the vibration reduction control means, and the vibration is transmitted through the vibration transmission path by the vibration reduction means. The vibration is reduced, and the vibration at the evaluation position is also reduced.

According to the second aspect of the present invention, the vibration at the predetermined evaluation position is detected by the evaluation position vibration detecting means, and the determining means detects the vibration at the evaluation position vibration after the control of the vibration reduction control means has been executed. If it is determined that the detected vibration is above a predetermined level, the frequency of the vibration at that time is stored in the frequency storage means. Therefore, when the vibration transmitted through the vibration transmission path is reduced by the vibration reducing unit when the vibration having the frequency stored in the frequency storage unit is generated, the vibration at the evaluation position becomes worse than the predetermined level. .

Therefore, if the control prohibiting means prohibits the control of the vibration reduction control means when the vibration of the frequency stored in the frequency storage means is generated, the deterioration of the vibration at the evaluation position is prevented. When the vibration having a frequency other than the frequency stored in the frequency storage means is generated, the control prohibition means does not particularly prohibit the control of the vibration reduction control means, and the vibration is transmitted through the vibration transmission path by the vibration reduction means. The vibration is reduced, and the vibration at the evaluation position is also reduced.

Further, in the invention according to claim 3,
Vibrations at the selected plurality of evaluation positions are detected by each of the evaluation position vibration detection means, and determination is made based on a value of a predetermined evaluation function using the vibration at each of the evaluation positions detected by the plurality of evaluation position vibration detection means as a variable. Since the means makes the determination, the vibration status at each evaluation position is reflected in the control content. Further, according to the invention of claim 4, the weighting factor setting means sets the vibration of each evaluation position taken into the evaluation function in the invention of claim 3 based on the frequency of the vibration detected by the frequency detecting means. , The vibration condition at each evaluation position is reflected in the control content at a rate corresponding to the frequency of the vibration.

Further, in the invention according to claim 5,
Since the evaluation position vibration detecting means detects the muffled sound (sound is one mode of vibration) near the occupant's ear position, deterioration of the muffled sound is prevented.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a first embodiment of the present invention, in which a controlled vibration isolator according to the present invention is applied to an engine mount of a vehicle. First, the configuration will be described.

That is, as shown in FIG. 1 showing the overall configuration of this embodiment, an engine 2 as a vibration source of a vehicle 1 has two passive engine mounts 3 and 4, and one engine as a vibration reducing means. It is supported on the vehicle body by a total of three engine mounts 3 to 5 including an active engine mount 5. The engine 2 is provided with an engine speed sensor 7 as frequency detecting means for detecting the engine speed. The engine speed sensor 7 supplies an engine speed detection signal N to the controller 20.

In the cabin 8 of the vehicle 1, there is provided a microphone 9 as an evaluation position vibration detecting means for detecting noise at the occupant's ear position as an evaluation position, and the microphone 9 is muffled. The sound detection signal E is supplied to the controller 20. Here, the passive engine mounts 3 and 4 are made of an elastic body interposed between the engine 2 and the vehicle body, and generate a vibration transmitted from the engine 2 to the vehicle body side by a spring constant and a damping characteristic of the elastic body. It is a passive reduction.

On the other hand, as shown in FIG. 2, the active engine mount 5 has an elastic body 5a interposed between the engine 2 and the vehicle body 1A and supporting a static load of the engine 2, and an inside of the elastic body 5a. A fluid chamber 5b is defined, a fluid sealed in the fluid chamber 5b, and an actuator 5c that changes the volume of the fluid chamber 5b. The actuator 5c is controlled by the controller 20. It is driven according to a control current supplied from the actuator drive power supply 21.

Further, a vibration sensor 10 as a path vibration detecting means for detecting vibration of the vehicle body 1A is disposed near the mounting position of the engine mount 5 on the vehicle body 1A side. The vibration detection signal X is supplied to the controller 20. And the controller 20
Is constituted by a microprocessor, an interface circuit, and the like (not shown), and is basically based on an engine speed detection signal N supplied from the engine speed sensor 7 and a vibration detection signal X supplied from the vibration sensor 10. Then, while performing the process of driving the actuator 5c so that the vibration transmitted from the engine 2 to the vehicle body 1A is absorbed by the engine mount 5, the vibration transmitted to the vehicle body 1A by driving the actuator 5c is performed. As a result, at a frequency at which the muffled sound transmitted to the interior of the vehicle cabin 8 is deteriorated, a process for prohibiting the control of the actuator 5c is executed.

FIG. 3 is a flowchart showing the outline of the processing executed by the microprocessor in the controller 20, and the operation of this embodiment will be described below with reference to this flowchart. First, in step 101, the engine speed detection signal N supplied from the engine speed sensor 7 is read, and then the process proceeds to step 102.
Based on the engine speed detection signal N, a control prohibition map constructed in a process described later is searched.

The control prohibition map retrieved in step 102 is a map constructed using the engine speed as a variable. The vibration transmitted to the vehicle body 1A through the engine mount 5 is reduced, so that the muffled sound can be reduced. This indicates whether the vibration reduction control by the engine mount 5 is effective in reducing the muffled sound, in accordance with the engine speed.

Therefore, steps 102 to 10
Then, it is determined whether the vibration reduction control is valid as a result of searching the control prohibition map. If it is determined in step 103 that the control is not valid, the process returns to step 101. The above-described processing is repeatedly executed. On the other hand, if it is determined in step 103 that the vibration reduction control is an effective engine speed, the processing in step 104 and subsequent steps is executed.

Immediately after starting the processing shown in FIG.
Since the control prohibition map has not been constructed yet, it is determined that the control is valid at all engine speeds, and the process proceeds from step 103 to step 104. In step 104, the muffled sound detection signal E supplied from the microphone 9 is read, and the process proceeds to step 105, where the muffled sound detection signal E read in step 104, ie, before the vibration transmitted to the engine mount 5 is reduced. the status of the passenger's ears positioned near the muffled sound is stored as a pre-control execution detection signal E _1.

Then, the routine proceeds to step 106, where the actuator 5c of the engine mount 5 is appropriately driven, and
Vibration transmitted from the engine 2 side to the vehicle body 1A side, ie,
The control for reducing the vibration detection signal X detected by the vibration sensor 10 is executed. The contents of the vibration reduction control in step 106 are not particularly limited, and are known feedback control and adaptive control, for example, the engine speed detection signal N supplied from the engine speed sensor 7.
While the actuator 5c is driven with a control current synchronized with the control, the control of appropriately adjusting the phase of the control current so as to reduce the level of the vibration detection signal X supplied from the vibration sensor 10 is applied.

The vibration reduction control in step 106 allows the vehicle 1 to be moved from the engine 2 through the engine mount 5.
When the vibration transmitted to A is sufficiently reduced, the process proceeds to step 107 while the vibration reduction control is continued, and the muffled sound detection signal E supplied from the microphone 9 is read. Then, the process proceeds to Step 108, and Step 107
Comparing the muffled sound detection signal E read in, and a detection signal E ₁ before control execution stored in step 105.

[0031] In this step 108, the current muffled sound detection signal E when it is determined to be smaller than the control execution prior to detection signals E _1, i.e., a result of executing the vibration reduction control in step 106, in the passenger compartment 8 When the muffled sound is reduced, it can be determined that the vibration reduction control is effective at the current engine speed, and therefore, the process returns to step 101 and repeats the above processing without constructing the control prohibition map.

[0032] However, in step 108, in the case where read muffled sound detection signal E is determined to be larger than the control run prior to detection signals E ₁ Step 107, a result of executing the vibration reduction control in step 106, the car It can be determined that the muffled sound in the room 8 has worsened. That is, at the current engine speed, executing the vibration reduction control in step 106 means that, as described with reference to FIG. 7, reducing the vector v ₁ will instead increase the combined vector V _0. You will be invited
It can be determined that the vibration reduction control is not effective.

Therefore, steps 108 to 10
The process proceeds to S9, where information indicating that the control is not valid at the current engine speed is constructed in the control prohibition map, and the process returns to step 101 to repeatedly execute the above-described processing. Then, after the information is constructed in the control prohibition map, if the same engine speed detection signal N as when the vibration reduction control is determined to be ineffective is read, the determination in step 103 is “NO”. Step 1
The process after step 04 is not executed, and the process returns to step 101.

That is, when the engine speed detection signal N, for which it is determined that the vibration reduction control is not valid, is read, the vibration reduction control in step 106 is not executed. The inside muffled sound is prevented from being deteriorated. Then, when the processing of steps 101 to 109 is repeatedly executed, a control prohibition map is gradually built, so that the engine speed at which the vibration reduction control is effective and the engine speed at which the vibration reduction control is not effective are clearly distinguished. become.

Then, in the example shown in FIG. 8, the vibration reduction control is executed in the region lower than the engine speed N ₁ , and the vibration is reduced in the region from the engine speed N ₁ to the engine speed N _2. reduction control is prohibited, also in the area between extending from the engine speed N ₂ of the engine speed N ₃ is executed to reduce control vibration, so that vibration reduction control is prohibited in the region higher than the engine speed N ₃ become.

As a result, the muffled sound in the cabin 8 can be reduced to the maximum extent possible in all engine speed ranges. Moreover, according to the configuration of the present embodiment, the control content does not become particularly complicated,
There is no significant cost increase. The engine speed at which the vibration reduction control is effective and the engine speed at which the vibration reduction control is not effective are determined by the transmission characteristics of the vibration from the engine 2 to the microphone 9, and the transmission characteristics are also determined by the engine mounts 3 to 3. 5, the control prohibition map is generated every time the engine 2 stops, for example, because it changes under the influence of the temperature of the elastic body, deterioration over time, the number of occupants of the vehicle 1, the temperature in the cabin 8, and the like. It is desirable to reset and rebuild after the engine 2 has been started.

When it can be determined that the control prohibition map has been constructed for the entire engine speed range (for example,
If a sufficient time has elapsed since the start of the engine 2), the flow directly proceeds from step 103 to step 106 to execute the vibration reduction control, and then to step 107.
Subsequent processing is not executed, and steps 106 to 10
You may change to the processing content which returns to 1.

Here, in this embodiment, the vibration reduction control means is constituted by the processing of step 106,
The determination means is constituted by the processing of steps 04, 105 and 108, and the frequency storage means is constituted by the processing of step 109 and the control inhibition map.
The control prohibiting means is constituted by the processing of No. 3. FIG. 4 is a view showing a second embodiment of the present invention. In this embodiment, similarly to the first embodiment, the control type vibration damping device according to the present invention is applied to an engine mount of a vehicle. It is. FIG. 4 corresponds to FIG. 3 of the first embodiment, and the other configuration of the present embodiment is the same as that of the first embodiment.

That is, even in this embodiment, step 10
In step 1, the engine speed detection signal N supplied from the engine speed sensor 7 is read, in step 102 a control prohibition map is searched, and when it is determined in step 103 that the vibration reduction control is not effective, step 101 The point that the above-described processing is repeatedly executed after returning to
This is the same as the embodiment.

However, in this embodiment, when it is determined in step 103 that the vibration reduction control is effective, steps 104 and 10 described in the first embodiment are performed.
For 5 does not execute, that is, without storing the control execution prior to detection signals E _1, the process proceeds to step 106 to execute the vibration damping control. When the vibration transmitted from the engine 2 to the vehicle body 1A through the engine mount 5 is sufficiently reduced by the vibration reduction control in step 106, the process proceeds to step 107 while continuing the vibration reduction control, and the muffled sound supplied from the microphone 9 The detection signal E is read.

Then, the routine proceeds to step 110, where a threshold value P is set by referring to a threshold value map based on the engine speed detection signal N. This threshold value P is a result of reducing the vibration transmitted by the engine mount 5,
This is a threshold value at which it is possible to determine that the muffled sound in the cabin 8 has been reduced, and is set in advance according to the type of vehicle.

Then, the processing shifts to step 111, where the muffled sound detection signal E read in step 107 and the threshold value P
Compare with In this step 111, when it is determined that the current muffled sound detection signal E is smaller than the threshold value P, that is, as a result of executing the vibration reduction control in step 106, the muffled sound in the cabin 8 is reduced. In this case, since it can be determined that the vibration reduction control is effective at the current engine speed, the process returns to step 101 and repeats the above processing without constructing the control prohibition map.

However, in step 111, the muffled sound detection signal E read in step 107
If it is determined that the noise is larger than the threshold value, the vibration reduction control is executed in step 106, and as a result, it is determined that the muffled sound in the cabin 8 has worsened, and the process proceeds to step 109 to construct a control prohibition map. That is, in the present embodiment, the level of the muffled sound before the execution of the control does not matter, and if the level of the muffled sound after the execution of the control is within an allowable range, the vibration reduction control by the engine mount 5 is muffled. It is determined that the vibration reduction control is effective, and conversely, if it is outside the allowable range, the vibration reduction control is determined to be ineffective.

For this reason, there is no need to detect and store the muffled sound in the vehicle cabin 8 when the vibration reduction control is not being executed, so that the control content is simplified as compared with the first embodiment. There is. Moreover, the fact that it is not necessary to store the muffled sound in the cabin 8 when the control is not being executed means that the vibration reduction control in step 106 is performed when it is determined in step 103 that the vibration reduction control is not effective. You only have to forbid it.

That is, in the first embodiment, before the control prohibition map is completed, in order to determine whether the vibration reduction control is effective, for example, every time the engine speed fluctuates, the vibration reduction control is performed. In this embodiment, it is possible to judge whether or not the vibration reduction control is effective while the vibration reduction control is being executed. Pleasure can be minimized.

The other functions and effects are the same as those of the first embodiment. Here, in the present embodiment, step 10
The determination means is constituted by the processes of 7, 110 and 111. FIGS. 5 and 6 show a third embodiment of the present invention. In this embodiment, as in the first embodiment, the control type vibration damping device according to the present invention is applied to an engine mount of a vehicle. It was done.

That is, in the present embodiment, as shown in FIG. 5, the controller 20 transmits the muffled sound detection signal E output from the microphone 9 and the vibration detection signal X output from the vibration sensor 10 to the vehicle interior. 8, a vibration detection signal Y output from a vehicle interior vibration sensor 15 as an evaluation position vibration detection means disposed at the foot position of the occupant in the occupant is supplied,
The controller 20 executes the processing shown in FIG. 6 based on these signals E, X, and Y.

In the processing shown in FIG.
Steps 103 to 103 are the same as those in the first embodiment, except that
If it is determined in step 03 that the control is valid, the process proceeds to step 112, where the muffled sound detection signal E and the vibration detection signal Y are read. Next, the routine proceeds to step 113, where the weighting factors A and B are set with reference to a predetermined map based on the engine speed detection signal N.

[0049] Then, the process proceeds to step 114, based on the evaluation function expressed by the following equation (1), calculates an evaluation value J _1. J ₁ = A · E ² + B · Y ² (1) Next, the process proceeds to step 106 to execute a vibration reduction control, and the vibration transmitted from the engine 2 to the vehicle body 1A through the engine mount 5 by the vibration reduction control. Is sufficiently reduced, the process proceeds to step 115 while the vibration reduction control is continued, and the muffled sound detection signal E and the vibration detection signal Y are read.

[0050] Then, the process proceeds to step 116, based on the evaluation function expressed by the following equation (2) to calculate the evaluation value J _2. J ₂ = A · E ² + B · Y ² (2) Then, the process proceeds to step 117, where the evaluation value J ₁ calculated before executing the vibration reduction control, and the evaluation value J ₂ calculated after executing the vibration reduction control. Compare.

In this step 117, the evaluation value J ₁
Is smaller than the evaluation value J ₂ , that is, if the muffled sound in the cabin 8 is reduced as a result of executing the vibration reduction control in step 106, the vibration at the current engine speed is reduced. Since it can be determined that the reduction control is effective, step 10 is performed without constructing the control prohibition map.
Returning to step 1, the above processing is repeatedly executed.

However, if it is determined in step 117 that the evaluation value J ₁ is larger than the evaluation value J ₂ , the vibration reduction control is executed in step 106, and the muffled sound in the cabin 8 is rather deteriorated. And step 109
Then, the control prohibition map is constructed. That is, in the present embodiment, the vibration state in the passenger compartment 8 is evaluated based on the muffled sound near the occupant's ear position and the vibration at the occupant's foot position. Then, the weighting factors A and B set in step 113 are set to be relatively large, for example, at the time of idling in which floor vibration is mainly a problem, so that the vibration at the foot position of the occupant becomes large in the control content. On the other hand, at the rotation speed at which the muffled sound becomes a problem, the weighting coefficient A is relatively increased so that the muffled sound is largely reflected on the control content, thereby further reducing discomfort. It can be a control type vibration isolator.

Other functions and effects are the same as those of the first embodiment. In this embodiment, similarly to the second embodiment, the evaluation value indicating the vibration state after the control is executed without detecting and storing the vibration state in the vehicle interior 8 before executing the vibration reduction control. and J _2, may be controlled to determine whether it is valid based on the threshold set in advance.

Here, in this embodiment, step 112,
The processing of steps 114, 115 to 117 constitutes the determination means, and the processing of step 113 constitutes the weight coefficient setting means. In each of the embodiments described above, the case where the controlled vibration isolator according to the present invention is applied to an engine mount of a vehicle has been described. However, the application target of the present invention is not limited to this, and vibrations other than the engine may be applied. The device may support the source.

In each of the above embodiments, the case where a fluid-filled engine mount is applied as the active engine mount 5 has been described. However, another type of engine mount may be used.

[0056]

As described above, according to the present invention,
It is determined whether or not the vibration reduction control is effective according to the frequency of the vibration. If the vibration at the evaluation position is rather deteriorated, the control of the vibration reduction control means is prohibited. The vibration reduction control is executed only when is reduced, and there is an effect that a good vibration isolation effect can be obtained over a wide frequency band.

In particular, according to the second aspect of the present invention, since the vibration reduction control is prohibited only when it is determined that the vibration reduction control is not effective, the discomfort experienced by the occupant can be further reduced. This has the effect.

[Brief description of the drawings]

FIG. 1 is a plan view showing an overall configuration of a first embodiment.

FIG. 2 is an enlarged sectional view of the vicinity of a main part of the first embodiment.

FIG. 3 is a flowchart illustrating an outline of a process according to the first embodiment.

FIG. 4 is a flowchart illustrating an outline of a process in a second embodiment.

FIG. 5 is a block diagram showing a system configuration of a third embodiment.

FIG. 6 is a flowchart illustrating an outline of a process in a third embodiment.

FIG. 7 is a diagram expressing a state of vibration transmission by a vector.

FIG. 8 is a graph showing a change in sound pressure level when vibration reduction control is executed and when it is not executed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine (vibration source) 3, 4 Engine mount 5 Engine mount (vibration reduction means) 7 Engine speed sensor (frequency detection means) 8 Cab 9 Microphone (evaluation position vibration detection means) 10 Vibration sensor (path vibration detection) Means) 15 Vehicle interior vibration sensor (evaluation position vibration detection means) 20 Controller

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16F 13/00 F16F 15/02

Claims (5)

(57) [Claims] 1. An evaluation position vibration detecting means for detecting vibration at a predetermined evaluation position at which vibration is transmitted from a vibration source through a plurality of vibration transmission paths, and at least one vibration transmission path among the plurality of vibration transmission paths , A path vibration detecting means for detecting vibration on the evaluation position side of the vibration reducing means, and controlling the vibration reducing means such that the vibration detected by the path vibration detecting means is reduced. Vibration reduction control means, a frequency detection means for detecting the frequency of the vibration generated in the vibration source, and the evaluation position vibration detection means detected after the execution of the control than before the control of the vibration reduction control means Determining means for determining whether the vibration has deteriorated; frequency storing means for storing a frequency detected by the frequency detecting means when the determining means determines that the vibration has deteriorated; A control type vibration isolator, comprising: a control prohibition unit that prohibits the control of the vibration reduction control unit when the vibration of the frequency stored in the frequency storage unit is generated. 2. An evaluation position vibration detecting means for detecting vibration at a predetermined evaluation position to which vibration is transmitted from a vibration source through a plurality of vibration transmission paths, and at least one vibration transmission path among the plurality of vibration transmission paths , A path vibration detecting means for detecting vibration on the evaluation position side of the vibration reducing means, and controlling the vibration reducing means such that the vibration detected by the path vibration detecting means is reduced. Vibration reduction control means, a frequency detection means for detecting the frequency of the vibration generated by the vibration source, and the vibration detected by the evaluation position vibration detection means after execution of the control of the vibration reduction control means is equal to or higher than a predetermined level. Determination means for determining whether or not the frequency is higher than a predetermined level; and frequency storage means for storing a frequency detected by the frequency detection means when the determination means determines that the level is equal to or higher than a predetermined level. A control prohibition unit that prohibits the control of the vibration reduction control unit when the vibration of the frequency stored in the frequency storage unit is generated. 3. A plurality of evaluation positions are selected, and evaluation position vibration detecting means are provided for each of the evaluation positions. The determining means detects the vibration of each evaluation position detected by the plurality of evaluation position vibration detecting means. 3. The control-type image stabilizing apparatus according to claim 1, wherein a predetermined determination is performed based on a value of a predetermined evaluation function as a variable. 4. The controlled vibration isolator according to claim 3, further comprising weighting factor setting means for setting a weighting factor for vibration at each evaluation position based on the frequency detected by the frequency detecting means. 5. A control type vibration damping device applied to a vehicle, wherein the vibration source is an engine, and the evaluation position vibration detection means detects muffled sound near the occupant's ear position as vibration. The control type vibration damping device according to claim 4.