JP2002052941A - Active mount control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an active mount control device capable of securely maintaining vibrationproofing property with respect to changes in the lapse of time of a vibration proof rubber or the like of an active mount. SOLUTION: The control device 50 applies a periodic pulse signal from a vibration generation source of a vehicle with respect to an engine mount 20, in which a mount with an exciter is provided on the vehicle, to find the control data of the active mount in a frequency band of a controlled object for suppressing vehicle vibration, and generate, an exciting condition table. Thus, external force from the vibration generation source can be restrained by controlling the engine mount 20 based on the excitation condition table. The content of the excitation condition table is updated to a content corresponding to a property change of the active mount based on an updated condition, which is a predetermined travel distance of the vehicle and/or a predetermined lapse of time from the vehicle production.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active mount control device for controlling the operation of an active mount that actively suppresses vibration of a vehicle body.

[0002]

2. Description of the Related Art Conventionally, as an active control method of an engine mount, which is an active mount provided in an automobile, a control device of a vehicle M includes, for example, as shown in FIGS. Hereinafter, an adaptive control unit 90 using a DXHS LMS filter)
Is applied to obtain an optimum filter coefficient for each arbitrary number of rotations (frequency) to perform active control.

[0003] That is, an adaptive control method using a DXHS LMS filter is based on an adaptive least mean square filter (Filtered-XL).
MS) to reduce the calculation amount of the filter coefficient, and is performed as follows. In this adaptive control, from a vibration source 61 such as an engine of the vehicle M, which is a signal source,
A crankshaft rotation pulse or the like is extracted by the sensor 12, the frequency determination unit 91 determines that the frequency is the control target frequency ω, selects a control target signal of the control target frequency ω,
Output to the adaptive filter W92. The input signal x is amplitude-compensated and phase-compensated by the filter coefficient of the adaptive filter W92, and is synthesized with a sine wave signal and output.

[0004] The output signal y is input to a signal transmission system 93 (transfer function G), and a processed signal z is output. Processing signal z
Is added to the external force d via the transmission system 62 (G '), which is the vibration of the engine, and is detected by the sensor as an observed value. In the vibration control, the target of the detection value of the sensor is 0, and the difference from the target becomes the error signal e. Here, the error signal e is obtained from the pickup acceleration sensor 1 provided on the sheet 13.
This is the output from 4. Using the error signal e (n) and a predetermined estimated transfer characteristic 95 of the signal transfer system, the filter coefficient of the adaptive filter W is sequentially updated by the digital filter 94 (DXHS LMS). The output signal updated in the adaptive filter 92 based on the optimal filter coefficient sequentially updated in this manner allows the engine mount 2
By driving the zero actuator 20a, the external force can be canceled.

Further, as another active control method of the engine mount, for example, the DXHS
The adaptive control unit 90 using the LMS filter is applied to obtain an optimum filter coefficient for each arbitrary number of rotations (frequency) to create and store an excitation condition table 52a (see FIG. 8). In some cases, the excitation condition table 52a is extracted in the form of a ROM and applied to the control unit 51a of the control device 50a of the vehicle M to perform active control as shown in FIGS.

That is, a crankshaft rotation pulse or the like is extracted by a sensor 12 from a vibration source 61 such as an automobile engine as a signal source, and a frequency determination unit 71 determines that the frequency is a control target frequency ω, and performs control. A control target signal of the target frequency ω is selected and output. The signal x is subjected to amplitude compensation and phase compensation by the filter coefficient of the excitation condition table 52a in the signal shaping section 72, and is combined with a sine wave signal and output. The output signal y is output from the signal processing system 7.
3 (transfer function G), a processing signal z is output,
With the processing signal z, the external force d via the transmission system 62 (G ′), which is the vibration of the engine, is suppressed. According to this active mount control method, the sensor for vibration detection can be omitted, the configuration of the control device 50a can be simplified as compared with the adaptive control device, and the cost of the device can be reduced.

[0007]

However, the anti-vibration rubber of the engine mount has been reduced by about -2 from the time when the vehicle was manufactured.
About 200k in a temperature atmosphere of 5 ° C to + 120 ° C
g, which will be supported by multiple engines.
Changes in vibration isolation characteristics are inevitable. Therefore, the effect of vibration control is not sufficiently exhibited by using the vibration condition table at the beginning of vehicle manufacture or performing active control using the same estimated transfer characteristic for such deterioration of the vibration isolating rubber. On the contrary, the vibration may be worsened.

An object of the present invention is to provide an active mount control device capable of reliably maintaining the anti-vibration performance against the aging of the anti-vibration rubber and the like of the active mount. It is assumed that.

[0009]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, a structural feature of the invention according to the first aspect is that an active mount which is a mount with a vibrator provided in a vehicle is provided. On the other hand, applying a periodic pulse signal from a vehicle vibration source, obtaining active mount control data in a frequency band to be controlled to suppress vehicle body vibration, and creating a vibration condition table, In an active mount control device that controls an operation of a vibration exciter based on a table to suppress an external force from a vibration source, the contents of a vibration condition table are set to a predetermined traveling distance of a vehicle and / or a vehicle. The content is updated to the content corresponding to the change in the active mount based on the update condition which is a predetermined elapsed time from the manufacture of the device.

[0010] In the invention according to claim 1 configured as described above, due to the deterioration of the vibration isolating rubber of the active mount mounted on the vehicle due to the long-term use of the vehicle, the contents of the initial vibration condition table are not changed. Although the control becomes insufficient, such deterioration of the vibration isolating rubber or the like is performed on the basis of an update condition that is a predetermined traveling distance of the vehicle and / or a predetermined elapsed time from the manufacture of the vehicle. The contents of the excitation condition table are automatically updated to the contents corresponding to the change in the characteristics of the active mount. In other words, when the anti-vibration characteristics change due to deterioration of anti-vibration rubber due to long-term use of the vehicle,
Active mount control is performed based on the updated appropriate excitation condition table.

As a result, according to the first aspect of the present invention, even when the anti-vibration characteristics of the active mount change with time, the appropriate anti-vibration characteristics are always maintained by the vibration control based on the updated appropriate excitation condition table. In particular, low vibration and low noise performance in the initial stage of the vehicle are appropriately maintained. Also,
Since good vibration isolation control can be maintained continuously, the time and effort required for regular maintenance, such as re-measurement of the rubber vibration isolator characteristics at the time of regular maintenance of the vehicle, which is conventionally required, becomes unnecessary. Can be reduced.

According to a second aspect of the present invention, in the active mount control device according to the first aspect, a vibration condition table is prepared and stored for each update condition, and the update condition is updated. When the condition is satisfied, the vibration condition table is switched to another vibration condition table according to the update condition and updated. By thus switching and updating the excitation condition table according to the update condition, the effect of the invention described in claim 1 can be obtained.

According to a third aspect of the present invention, in the control data setting method of the active mount control device according to the second aspect, the calculation formula using the excitation condition table as an update condition as a variable is used. When the update condition is met, the excitation condition table is rewritten and updated based on the calculation formula according to the update condition. By updating the excitation condition table in accordance with the update condition in this manner, the effect of the invention described in claim 1 can be obtained.

A structural feature of the invention according to claim 4 is that, based on a periodic pulse signal from a vibration source of the vehicle, an active mount, which is a mount with a vibrator provided in the vehicle, is provided. The input signal is subjected to amplitude compensation and phase compensation by the filter coefficient of the adaptive filter, the output signal from the adaptive filter is processed by the signal transmission system of the vehicle, and the sum of the signal processed by the signal transmission system and the external force from the vibration source. Based on an adaptive control method in which a filter coefficient is sequentially updated by a digital filter based on the error signal and the estimated transfer characteristic estimated in advance of the signal transfer system, and the updated filter coefficient is returned to the adaptive filter, In the active mount control device for suppressing an external force by controlling the operation of the vehicle, the content of the estimated transfer characteristic is determined by the travel distance of the vehicle and / or Based on the elapsed time it is updated conditions from both the production lies in the fact that so as to update the contents corresponding to the characteristic change of Akuteibu mount.

[0015] In the invention according to claim 4 configured as described above, due to the deterioration of the anti-vibration rubber of the active mount provided in the vehicle or the like, the initial estimated transfer characteristic used for updating the filter coefficient in the adaptive control method is changed. Although the content is insufficiently controlled, the update condition, which is a predetermined traveling distance of the vehicle and / or a predetermined elapsed time since the manufacture of the vehicle, is determined in response to such deterioration of the vibration isolating rubber. Based on this, the data content of the estimated transfer function is automatically updated. That is, when the anti-vibration characteristics change due to a change in the material of the anti-vibration device due to long-term use of the vehicle, the operation of the active mount by the subsequent adaptive control method is controlled based on the updated estimated transfer function data. You.

As a result, according to the fourth aspect of the present invention, it is possible to always maintain a proper anti-vibration characteristic by adaptive control based on a proper estimated transmission characteristic even when the anti-vibration characteristic of the active mount changes with time. In particular, low vibration and low noise performance in the initial stage of the vehicle are appropriately maintained. In addition, since good anti-vibration control is always maintained, regular maintenance that was conventionally required, such as re-measurement of anti-vibration rubber characteristics at the time of regular maintenance of the vehicle, becomes unnecessary. Costs can be reduced.

According to a fifth aspect of the present invention, in the active mount control device according to the fourth aspect, an estimated transfer characteristic is prepared and stored for each update condition, and Is satisfied, the estimated transfer characteristic is switched to another estimated transfer characteristic according to the update condition and updated. By updating the estimated transfer characteristic according to the update condition, the effect of the invention described in claim 4 can be obtained.

According to a sixth aspect of the present invention, in the active mount control device according to the fourth aspect, the estimated transfer characteristic is configured by a calculation formula using an update condition as a variable. When the update condition is satisfied, the estimated transfer characteristic is rewritten and updated based on the calculation formula according to the update condition. By updating the estimated transfer characteristic according to the update condition, the effect of the invention described in claim 4 can be obtained.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a mass-produced gasoline engine vehicle equipped with a mass-produced engine mount with a vibrator. FIG. 2 is a block diagram showing a schematic configuration of an active control system for removing a vehicle vibration of M, and FIG. 2 is a block diagram showing the active control system.
The gasoline engine vehicle M has an engine mount with an exciter (hereinafter referred to as an engine mount) 20 as an active mount mounted on a vehicle body 10. A rotation pulse sensor 12 is provided on a crankshaft of the engine 11, and the rotation pulse sensor 12 outputs a crankshaft rotation pulse signal. Based on this, a control unit 51, which will be described later, determines a basic frequency of the output signal. Decision and signal processing are performed.

As shown in detail in FIG. 3, for example, the engine mount 20 comprises a first support fitting 21 and a second support fitting 3 which are arranged at a predetermined interval coaxially with each other and vertically.
0 and a substantially cylindrical main body rubber elastic body 41 connecting the both. The first support fitting 21 is used for the engine 1
1, and the second support fitting 30 is fixed to the vehicle body 10.
1 is supported on the vehicle body 10 by vibration isolation.

The first support member 21 has an upper metal member 22 and a lower metal member 23 of a substantially symmetrical shape having a substantially cylindrical shape with a bottom which are axially overlapped on each opening side and connected by bolts B1 at respective outer peripheral flange portions. And has a hollow inside. A mounting bolt 24 protruding upward is fixed to the center of the upper surface of the upper fitting 22, and the first supporting fitting 21 is fixed by the mounting bolt 24.
Are attached to the engine 11. A substantially disk-shaped thin rubber elastic film 25 is housed in the hollow portion of the first support fitting 21, and its outer peripheral edge is formed by the upper and lower fittings 2.
The hollow portion of the first support member 21 is liquid-tightly partitioned between the upper metal member 22 and the lower metal member 23 with the rubber elastic film 25 interposed therebetween by being sandwiched between the second metal member 23 and the second metal member 23. As a result, an air chamber R1 is formed between the rubber elastic film 25 and the upper fitting 22 through the air hole 22a and communicates with the external space to allow the rubber elastic film 25 to be deformed. An upper liquid chamber R2 in which an incompressible liquid is sealed and whose volume changes based on deformation of the rubber elastic film 25 is formed between the upper liquid chamber R2 and the metal fitting 23. As the liquid sealed in the upper liquid chamber R2,
Water, alkylene glycol, polyalkylene glycol, silicone oil and the like are used.

A disc-shaped passage forming member 26 is superimposed on the bottom wall of the lower member 23 of the first support member 21, and is fixed to each mounting hole by a bolt B2 inserted from below. A fluid passage 27 that forms an orifice passage that extends a little less than one circumference in the circumferential direction on the mating surface side with the lower metal fitting 23 is formed in the passage forming metal fitting 26, and one end of the fluid passage 27 is connected to the upper liquid. The other end is connected to the opening 23 a on the bottom surface of the lower fitting 23.

The second support fitting 30 is constituted by vertically connecting an annular connection fitting 31 and a substantially bottomed cylindrical bottom plate fitting 32 coaxially with each other. The connecting metal fitting 31 has an annular convex portion 31a that slightly protrudes in the axial direction from the inner peripheral surface in the upper half of the annular shape in the axial direction, and the upper end side including the annular convex portion 31a extends from the vicinity of the outer periphery toward the center. Generally inverted conical sloping surface 3 sloping downward
1b. The bottom plate 32 is provided with a flange-like flange 32a extending radially outward at the upper end opening. B3 is fixed to the connection fitting 31 by screwing.
A bolt is screwed into a bolt hole (not shown) provided on the lower surface of the bottom plate bracket 33, and the second support bracket 30 is attached to the vehicle body 10.

The second support member 30 is opposed to the first support member 21 at a predetermined distance axially downward with a predetermined distance therebetween. The two support members are elastically moved by a main rubber elastic body 41 interposed therebetween. It is connected to. Body rubber elastic body 41
Is a thick, substantially conical cylindrical shape, and the small-diameter upper end opening is the first
The lower end 23 of the supporting member 21 is vulcanized and bonded to the outer peripheral surface thereof, and the large-diameter lower end opening is mainly formed on the upper surface 31b of the projecting portion 31a.
Are vulcanized and bonded to the connection fitting 31. As a result, the first support member 21 and the second support member 30 are elastically connected by the main rubber elastic member 41, and the main body rubber elastic member 4 is provided between the opposing surfaces of the first support member 21 and the second support member 30.
1, a space is formed inside.

A connection plate 34, which is an annular thin metal plate, is fitted into the lower inside of the annular projection 31a of the connection fitting 31, and the annular projection 31a is inserted by a bolt B4 inserted from below through the mounting hole. It is fixed to. The inner diameter of the connecting plate 34 is substantially the same as the inner diameter of the annular convex portion 31a, and a disk-shaped vibrating plate 35 made of a hard material such as metal or resin is provided inside the connecting plate 34 in the radial direction. They are arranged coaxially. Further, a ring-shaped rubber elastic body support plate 36 is interposed between the inner peripheral edge of the connecting plate 34 and the outer peripheral edge of the vibration plate 35. That is, the vibration plate 35 is elastically supported by the connection fitting 34 via the rubber elastic body support plate 36, and closes the center hole of the connection fitting 31 together with the rubber elastic body support plate 36 in a liquid-tight manner. I have. As a result, the lower liquid chamber R whose peripheral wall is formed of the main rubber elastic body 41 is provided between the first support fitting 21 and the opposing surfaces of the vibration plate 35 and the rubber elastic body support plate 36.
3 are formed. The incompressible liquid is sealed in the lower liquid chamber R3.

The lower liquid chamber R3 is connected to the fluid communication passage 27 provided in the first support fitting 21 through an opening 23a, and the upper liquid chamber R2 is connected to the lower liquid chamber R3 through the fluid communication passage 27. Communicating. Here, in the fluid communication passage 27, the resonance frequency of the fluid flowing through the inside corresponds to the idling vibration in consideration of the spring rigidity of each wall of the upper liquid chamber R2 and the lower liquid chamber R3, the viscosity of the sealed fluid, and the like. The length and the cross-sectional area of the passage are set so as to obtain the effect of reducing the vibration transmitting force in a frequency range around 20 Hz.

The vibration plate 35 protrudes coaxially in a ring shape on the outer peripheral side of the lower surface thereof, and the inside of the protruding portion is a circular concave portion 35a. On the lower surface side of the vibration plate 35, a push-up member 37 having a bottomed cylindrical shape is overlapped with the bottom portion 37a facing upward, and a disk-shaped convex portion on the upper surface side of the bottom portion 37a is In the circular recess 35a. The push-up member 37 is fixed to the vibration plate 35 by screwing a bolt B5 from below into a mounting hole provided at each axis position with respect to the vibration plate 35. In the push-up member 37, the outer diameter of the cylindrical portion 37 b is slightly larger than the outer diameter of the vibration plate 35 and slightly larger than the inner diameter of the bottom plate 32. An annular recess 37c is provided on the outer peripheral surface of the cylindrical portion 37b along the entire circumference in the circumferential direction.
Is wound with a coil 38 constituting an electromagnet, and the outer peripheral surface of the coil 38 is substantially flush with the outer peripheral surface of the cylindrical portion 37b.

An annular guide member 39 is provided so as to surround the coil 38 with the vibration plate 35 being horizontal.
The guide member 39 has an annular flange portion extending radially outward at the upper end thereof.
It is fixed to the upper surface of the bottom plate 32 by bolts B6. Thus, the push-up member 37 can be moved up and down coaxially by being surrounded by the guide member 39, and the up-and-down movement is propagated to the connected vibration plate 35 to cause vibration of the vibration plate. It has become.

On the other hand, a mounting recess 32b which is concentrically slightly recessed in a circle is provided on the inner bottom surface of the bottom plate fitting 32, and a columnar permanent magnet 43 is placed in a concentric position in the recess 32b. ing. The permanent magnet 43 is magnetized so that the upper surface is an S pole and the lower surface is an N pole. further,
A cylindrical yoke 44 made of a ferromagnetic material such as iron surrounds the permanent magnet 43 in close contact with the permanent magnet 43.
2b is tightly fitted, thereby restricting the lateral movement of the permanent magnet 43 and the yoke 44. The outer periphery of the yoke 44 is in contact with the cylindrical portion 3 of the lifting member 37.
7b is arranged with a slight gap from the inner peripheral surface. Further, a flat yoke 45 made of a ferromagnetic material such as iron is covered on the upper surfaces of the permanent magnet 43 and the yoke 44 in close contact with each other.

The coil 38 is connected to a lead wire (not shown), is magnetized by being supplied with power from the outside, and is subjected to an axial electromagnetic force by the action of the magnetic field of the permanent magnet 43.
This electromagnetic force is transmitted to the push-up member 37 as an axial force, and the vibration plate 35 vibrates. That is, by turning on / off the energization of the coil 38, the excitation plate 35
Is vibrated in the up and down direction, and the internal pressure fluctuation of the frequency and the pressure corresponding to the vibration frequency and the amplitude of the vibration plate 35 occurs in the lower liquid chamber R3, and the relative pressure between the lower liquid chamber R3 and the upper liquid chamber R2 is increased. Due to the internal pressure difference, the liquid flows through the fluid passage 27 between the two chambers, and the fluctuation in the internal pressure of the lower liquid chamber R3 is transmitted to the upper liquid chamber R2, and the excitation force corresponding to the fluctuation of the internal pressure of the upper liquid chamber R2 is increased. appear. As described above, by generating the excitation force by vibrating the vibration plate 35 at a frequency and amplitude corresponding to the vibration of the frequency to be damped in the vehicle body 10, the vibration transmitted from the engine 11 to the vehicle body 10 is reduced. Thus, an anti-vibration effect is actively exhibited.

The vehicle M is provided with an active control device 50. The active control unit 50 has a control unit 51 composed of a microcomputer. On the input side of the control unit 51,
The rotation pulse sensor 12 is connected, and a coil 38 which is an actuator of the engine mount 20 is connected to an output side via a power amplifier 53. Further, the control unit 51 includes a plurality of vibration condition tables (1), which are control data corresponding to a change with time of the vibration-proof rubber such as the rubber elastic body support plate 36 of the engine mount 20 and the main rubber elastic body 41. A recording medium 52 such as a ROM (chip), CDROM, or FD storing 2), (3)... Is stored. The vibration condition tables (1), (2), and (3) are obtained for the vibration-proof rubber corresponding to the update condition based on the traveling distance of the vehicle, the elapsed time since the vehicle was manufactured, or both. The control data is stored. The vibration condition table (1) corresponds to the data of the vibration-proof rubber in the initial state.

The vibration condition tables (1), (2),
The determination of (3) is performed by making an estimation based on the results of a thermal aging test of the vibration-proof rubber. The change in the characteristics of the vibration damping rubber in the actual vehicle can correspond to a certain extent to the heat aging test in the high-temperature bath. If the correspondence between the characteristic change organized by the mileage of the vehicle, the elapsed time from manufacture, etc. and the characteristic change arranged by the heat aging time is grasped from the vehicles manufactured in the past, the vehicles used in the past will be used. Can be estimated from the properties of the material after the corresponding heat aging time. This estimation result may be stored in a recording unit such as a ROM and used for determining the excitation condition table for determining the respective excitation conditions.

The control unit 51 switches from the excitation condition table (1) to (2) and (3), judging from the input update condition. Here, as for the update condition, the travel distance can be calculated by using the engine speed signal, and the elapsed time from the manufacture of the vehicle can be calculated by the timer of the control unit. 51. That is, the update condition instructing means 74 for instructing that the update condition has been reached and the table switching control means 75 for switching the excitation condition table in accordance with the update condition are provided in the control unit 51.

In the active control device 30, as shown in FIG. 2, the engine 11 (vibration source 61) as a signal source
Then, the crankshaft rotation pulse and the like are extracted by the sensor 12, the frequency determination unit 71 determines that the frequency is the control target frequency ω, and selects and outputs the control target signal of the control target frequency ω. The signal x is subjected to amplitude compensation and phase compensation by the corresponding filter coefficient of the excitation condition table (1) stored in the recording medium 52 in the signal shaping section 72,
The signal is synthesized with a sine wave signal and output. Output signal y
Is supplied to a signal transmission system 73 (transfer function G), and a processed signal z is output. With this processed signal z, the external force d via the transmission system 62 (G ′), which is the vibration of the engine, is suppressed. . FIG. 4 shows details of the signal processing in the control unit 51.

The engine mount 2 provided on the vehicle
Although the control of the initial vibration condition table (1) becomes insufficient due to the deterioration of the vibration-proof rubber, the control unit 51 updates the vibration-proof rubber in response to such deterioration of the vibration-proof rubber. The connection is switched from the vibration condition table (1) to the vibration condition table (2) by the table switching control means 75 in response to an instruction from the condition instruction means 74. Thereafter, based on the excitation condition table (2), the amplitude compensation and the phase compensation of the input signal x are performed, and the output signal y is output. Further, when it is determined that the next update condition is satisfied, the excitation condition table (2)
Is switched to the excitation condition table (3). That is, when the anti-vibration characteristics change due to changes in the anti-vibration rubber or the like of the engine mount 20 due to long-term use of the vehicle, active control of the engine mount 20 is performed based on the updated appropriate vibration condition table.

As a result, in the first embodiment, the control unit 51 can always maintain the proper vibration isolation characteristics based on the appropriate vibration condition table even when the vibration isolation characteristics of the engine mount change with time. In particular, low vibration and low noise performance in the initial stage of the vehicle are appropriately maintained. In addition, since good anti-vibration control is always maintained, there is no need for the conventionally required periodic maintenance, for example, re-measurement of the anti-vibration rubber characteristics at the time of regular maintenance of the vehicle, etc. Can be reduced.

In the first embodiment, the excitation condition table is prepared for each update condition and stored in the ROM, and when the update condition is satisfied, the excitation condition table is set according to the update condition. Instead of switching to another excitation condition table and updating, the excitation condition table is composed of a calculation formula with the update condition as a variable. The excitation condition table may be rewritten and updated based on a calculation formula according to conditions. This also provides the same effects as the above embodiment.

In the above embodiment, the control data is calculated as the excitation condition table by calculating the filter coefficient data by the adaptive control. However, the present invention is not limited to this. The control data is obtained by another control method. An excitation condition table may be used. For example, under certain operating conditions, active control is performed with arbitrarily set filter coefficients (gain, phase), and vibration noise characteristics are measured or sensory evaluated. Further, measurement or sensory evaluation is repeatedly performed under the setting of different filter coefficients, and a condition that provides the best vibration noise characteristic is selected from among the various set filter coefficient conditions, and is set as an active control condition. By performing this operation for various operating conditions (engine speed, vehicle speed, engine load, and the like), a control excitation condition table can be determined.

Next, a second embodiment will be described. In the present embodiment, the active mount is controlled by an adaptive control method, for example, an adaptive control method using a DXHS LMS filter. As shown in FIGS. , A plurality of estimated transmission characteristics (1), (2), (3),... Corresponding to a change with time of the rubber elastic body of the engine mount 20 are prepared, and stored in a ROM (chip), CDROM, FD, or the like. The medium 95 is stored. Estimated transfer characteristics (1),
(2), (3)... Are created for the vibration-proof rubber corresponding to the update condition based on the traveling distance of the vehicle, the elapsed time since the vehicle was manufactured, or both. Regarding the estimated transfer characteristic (1), the data in the initial state of the vibration isolation rubber correspond.

The control unit 81 performs the amplitude compensation and the phase compensation of the input signal x in the adaptive control unit 90 according to the engine speed signal and the error signal, while judging from the inputted update condition, and determines the estimated transfer characteristic ( Switching from 1) to (2) and (3) is performed. Here, the update conditions are the same as those described in the first embodiment. That is, the update condition instructing means 82 for instructing that the update condition has been reached and the table switching control means 83 for switching the excitation condition table in accordance with the update condition are provided in the control unit 81. Also, the creation of the estimated transfer characteristic is performed by making an estimation based on the result of the thermal aging test of the vibration isolating rubber, similarly to the creation of the vibration condition table. Other configurations of the vehicle M are the same as those shown in FIG.

In the second embodiment, as shown in FIG. 6, the control unit 81 performs active vibration control of the engine mount 20 by an adaptive control method. Due to the deterioration of the anti-vibration rubber, the content of the estimated transmission characteristic (1) of the signal transmission system in the adaptive control becomes insufficient in the control. In response to such deterioration of the vibration isolating rubber, the control unit 81 switches the connection from the estimated transmission characteristic (1) to the estimated transmission characteristic (2) by the table switching control unit 83 according to the instruction of the update condition instruction unit 82. Then, amplitude compensation and phase compensation of the input signal x are performed based on the estimated transfer characteristic (2), and an output signal y is output. In addition, when the next update condition is determined,
The estimated transfer characteristic (2) is switched to the estimated transfer characteristic (3). That is, when the anti-vibration characteristics change due to a change in the material or the like of the anti-vibration rubber due to long-term use of the vehicle, the engine mount 20 is controlled by adaptive control based on the updated appropriate estimated transmission characteristics.

As a result, in the second embodiment, as in the case of the first embodiment, the control unit 81 can control the proper estimated transmission characteristic of the signal transmission system by the temporal change of the vibration isolation characteristic of the engine mount 20. Therefore, appropriate vibration isolation characteristics can always be maintained based on the above, and in particular, low vibration and low noise performance in the initial stage of the vehicle are appropriately maintained. In addition, to maintain good anti-vibration control, regular maintenance,
For example, there is no need to re-measure the anti-vibration rubber characteristics at the time of regular maintenance of the vehicle or the like, and the cost for that can be reduced.

In the second embodiment, the estimated transfer characteristic is prepared for each update condition and stored in the ROM, and when the update condition is satisfied, the estimated transfer characteristic is set to another value corresponding to the update condition. Instead of updating to the estimated transfer characteristics, the estimated transfer characteristics are updated using a calculation formula that uses the update condition as a variable. May be rewritten and updated based on the vibration condition table. This also provides the same effects as the above embodiment.

In each of the above embodiments, the crankshaft rotation pulse signal of the engine is used as the pulse signal from the vibration source. However, the accelerator opening, the traveling speed, and the like obtained from the engine control unit and the like are also used.
It is also possible to use a vehicle state detection signal such as air conditioner on / off, shift position, and water temperature. In each of the above embodiments, a DXHS LMS filter is used as a digital filter. However, another adaptive filter such as a Filtered-X LMS filter may be used.

The present invention can be applied to an active mount other than the engine mount. In addition, what is shown in the above-mentioned embodiment is an example, and various changes can be made without departing from the gist of the present invention.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a schematic configuration of an active control system for removing a vehicle body vibration of a gasoline engine vehicle M equipped with an engine mount according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an active control system.

FIG. 3 is a sectional view showing an engine mount with an actuator used for active control.

FIG. 4 is an explanatory diagram illustrating signal processing contents of active control.

FIG. 5 is a configuration diagram showing a schematic configuration of an active control system for removing vehicle body vibration of a gasoline engine vehicle M equipped with an engine mount according to a second embodiment.

FIG. 6 is a block diagram showing an active control system according to a second embodiment.

FIG. 7 is a configuration diagram showing a schematic configuration of an active control system using adaptive control for removing vehicle body vibration of a vehicle as a conventional example.

FIG. 8 is a block diagram schematically showing an adaptive control system using a DXHS LMS filter for removing vibration.

FIG. 9 is a configuration diagram showing a schematic configuration of a conventional active control system using a vibration condition table for removing vehicle body vibrations of a vehicle.

FIG. 10 is a block diagram showing the active control system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Body, 11 ... Engine, 12 ... Rotation pulse sensor, 14 ... Pickup acceleration sensor, 20 ... Engine mount with a vibrator, 36 ... Rubber elastic body support plate, 38 ... Coil, 41 ... Body rubber elastic body, 50 ... Control device, 51: control unit, 52: excitation condition table ROM, 80: control device, 81: control unit, 90: adaptive control unit, 95: estimated transfer characteristic ROM.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D035 CA23 3J047 AA04 CA12 DA02 FA02 3J048 AB07 AB14 AD03 CB19 CB30 DA01 EA01 EA36

Claims (6)

[Claims] 1. A frequency band to be controlled to suppress vehicle body vibration by applying a periodic pulse signal from a vibration source of the vehicle to an active mount that is a mount with a vibrator provided in the vehicle. Active mount control for obtaining an excitation condition table by obtaining control data of the active mount in and controlling an operation of the exciter based on the excitation condition table to suppress an external force from the vibration source In the apparatus, the content of the vibration condition table is set in accordance with a characteristic change of the active mount based on a predetermined traveling distance of the vehicle and / or an update condition that is a predetermined elapsed time since manufacture of the vehicle. An active mount control device characterized in that the content is updated. 2. The excitation condition table is prepared and stored for each of the update conditions, and when the update condition is satisfied, the excitation condition table is changed to another excitation condition table corresponding to the update condition. The active mount control device according to claim 1, wherein the update is performed by switching to (i). 3. The excitation condition table is configured by a calculation formula using the update condition as a variable, and when the update condition is satisfied, the excitation condition is set based on the calculation formula based on the update condition. 2. The active mount control device according to claim 1, wherein the table is rewritten and updated. 4. An amplitude compensation and phase compensation of an input signal based on a periodic pulse signal from a vibration source of a vehicle to an active mount, which is a mount with a vibrator provided in the vehicle, by a filter coefficient of an adaptive filter. And an output signal from the adaptive filter is processed by a signal transmission system of the vehicle. An error signal, which is a sum of a signal processed by the signal transmission system and an external force from a vibration generation source, and an estimated transmission signal estimated by the signal transmission system The external force is suppressed by controlling the operation of the vibrator based on an adaptive control method in which the filter coefficient is sequentially updated by a digital filter based on the characteristic, and the updated filter coefficient is returned to the adaptive filter. In the active mount control device, the content of the estimated transfer characteristic is represented by a mileage of the vehicle and / or an elapsed time from manufacture of the vehicle. Based on the update conditions, active mount control apparatus being characterized in that so as to update the contents corresponding to the characteristic change of the Akuteibu mount. 5. The estimated transfer characteristic is prepared and stored for each update condition, and when the update condition is satisfied, the estimated transfer characteristic is switched to another estimated transfer characteristic according to the update condition. The active mount control device according to claim 4, wherein the active mount control device is updated. 6. The estimated transfer characteristic is constituted by a calculation formula using the update condition as a variable, and when the update condition is satisfied, the estimated transfer characteristic is written based on the calculation formula based on the update condition. 5. The active mount control device according to claim 4, wherein the active mount control device is changed and updated.