JPH07125527A - Vibration decreasing device of vehicle - Google Patents

Abstract

PURPOSE:To improve controllability of a vehicle as well as to efficiently decrease vibration in a vibration decreasing device of a vehicle for decreasing vibration to be generated on the vehicle by fluctuating load to be input in the vehicle body from wheels through suspension devices by driving exciting devices provided between the suspension devices and the vehicle body. CONSTITUTION:A plurality of suspension mounts (exciting units) 6 are provided so as to face a plurality of suspension devices, and a controller (a drive control means) 12 for controlling drive of respective suspension mounts 6 is provided, and the controller 12 is so constituted that the control ratio of respective suspension mounts 6 may be changed according to the state of the specific factor of the vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an exciter for generating an exciting force between a suspension device and a vehicle body, and driving the exciter to input the vibration from a wheel to the vehicle body through the suspension device. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle vibration reduction device that reduces vibration generated in a predetermined vibration element of a vehicle due to a fluctuating load.

[0002]

2. Description of the Related Art In a running vehicle, various fluctuating loads are applied from a wheel through a suspension device, for example, a fluctuating load input to a wheel contact surface due to a road surface displacement, a wheel rotation primary caused by an eccentricity of the wheel, or the like. A fluctuating load having a cycle is input to the vehicle body, and these fluctuating loads cause vibrations in predetermined vibration elements of the vehicle such as vehicle body constituent elements and air in the vehicle interior.

Conventionally, as disclosed in, for example, Japanese Patent Laid-Open No. 3-284406, a vibrator for generating a vibration force is provided between a suspension device and a vehicle body, and vibration of a predetermined vibration element of the vehicle is generated. Is detected by a vibration sensor, and the vibrator is driven based on the vibration detection signal from the vibration sensor to reduce the vibration generated in a predetermined vibration element due to the fluctuating load from the wheels. Reduction devices are known.

A vehicle is usually provided with a plurality of wheels and a plurality of suspension devices for suspending the respective wheels, and the fluctuating load is input to the vehicle body from the respective wheels via the respective suspension devices. In the above-described conventional vehicle vibration reduction device, in order to sufficiently cope with such fluctuating loads input from the respective wheels, a plurality of vibrators may be provided corresponding to a plurality of suspension devices. Are known.

[0005]

By the way, in the case where a plurality of vibration exciters are provided so as to correspond to a plurality of suspension devices, it is not always the case that the driving of each vibration exciter similarly contributes to vibration reduction. Absent. The state of the fluctuating load input from each wheel changes according to the state of various factors (hereinafter referred to as a predetermined factor) related to the vehicle such as the traveling speed and acceleration / deceleration state of the vehicle and the road surface state. The contribution rate of each exciter to the vibration reduction of the vibrating element also changes. It is not desirable to drive a vibration exciter having a low contribution to vibration reduction in the same manner as other vibration exciters in consideration of vibration reduction efficiency.

However, in the conventional vehicle vibration reducing device,
Since it is configured to drive each exciter so that the maximum vibration reduction effect is always obtained, even if there is an exciter with a low contribution rate to vibration reduction, by driving that exciter, As long as the vibration reduction effect can be improved to some extent, drive control will be performed on such a vibrator as with other vibrators, and therefore vibration cannot be reduced efficiently. there were.

On the other hand, the vibration generated in a predetermined vibrating element due to a fluctuating load input from the wheels to the vehicle body via the suspension device may be useful information for the occupant to sense the operating state of the vehicle. Therefore, it can be considered that it is not preferable in terms of vehicle maneuverability that the vibration of a predetermined vibration element, which is caused by a fluctuating load input from each wheel, is always greatly reduced. This has not been taken into consideration in conventional vehicle vibration reduction devices.

The present invention has been made in view of the above circumstances, and an object thereof is to efficiently reduce vibration of a predetermined vibration element of a vehicle caused by a fluctuating load input from a wheel to a vehicle body via a suspension device. Another object of the present invention is to provide a vibration reduction device for a vehicle, which is capable of improving the controllability of the vehicle.

[0009]

In order to achieve the above object, a vibration reducing device for a vehicle according to a first aspect of the present invention includes a vibration sensor for detecting vibration of a predetermined vibration element of the vehicle, and a plurality of the vibration sensors for the vehicle. Corresponding to each of the suspension devices, each of which is provided between each suspension device and the vehicle body and generates a vibrating force by a plurality of exciters and a variable load input to the vehicle body from the wheels through the suspension device. Drive control means for controlling the drive of the plurality of vibration exciters based on a vibration detection signal from the vibration sensor, so as to reduce the vibration generated in the vibrating element, the drive control means, A plurality of vibration exciters according to the state of a predetermined factor of the vehicle; and a ratio determining means for determining control ratios of the plurality of vibration exciters, and driving the plurality of vibration exciters according to the control ratios determined by the ratio determining means. Characterized in that it is configured to control.

It is desirable that the above-mentioned vibration exciter is provided in correspondence with each of all suspension devices of the vehicle, but it is not always required to be provided in correspondence with all suspension devices. For example, in the case of a four-wheeled vehicle, only two suspension devices may be provided, one corresponding to one of the two front wheel suspension devices and one corresponding to one of the two rear wheel suspension devices.

As a concrete mode of the invention described in claim 1, the predetermined factor is the traveling speed of the vehicle in the invention described in claim 2, and the traveling acceleration / deceleration of the vehicle in the invention described in claim 4, In the invention described in 6, the turning direction of the vehicle is set,
In the invention described in claim 8, the vertical load is applied to each wheel of the vehicle.

According to a third aspect of the present invention, there is provided a vehicle vibration reducing device according to the third aspect of the present invention.
When the traveling speed is in a region where the power train of the vehicle resonates due to the fluctuating load, the ratio determining means focuses and controls the vibration exciter arranged near the power train. In addition, the control ratio is determined.

According to a fifth aspect of the present invention, which is a concrete mode of the above-mentioned fourth aspect of the invention,
When the vehicle is accelerating, the ratio determining unit controls the drive of the vibrator installed corresponding to the suspension device that suspends the rear wheels of the vehicle, so that the vehicle is When the vehicle is decelerating, the control ratio is determined so that the vibration exciter arranged corresponding to the suspension device for suspending the front wheels is drive-controlled intensively.

According to a seventh aspect of the present invention, there is provided a vehicle vibration reducing apparatus as a concrete embodiment of the invention.
The ratio determining means determines the control ratio so that the vibration exciter arranged corresponding to the suspension device for suspending the wheel on the side opposite to the turning direction of the vehicle is drive-controlled intensively. Is characterized in that.

According to a ninth aspect of the present invention, there is provided a vehicle vibration reducing device as a concrete aspect of the invention.
The ratio determining means determines the control ratio so that the vibration exciter arranged corresponding to a suspension device that suspends a wheel on which a large vertical load is applied is drive-controlled intensively. Is characterized by.

According to a tenth aspect of the present invention, there is provided a vehicle vibration reducing device according to the first aspect, wherein:
It is characterized in that a control ratio operating means is provided so that an occupant can manually operate the determination of the control ratio.

[0017]

According to the invention of the first aspect having the above-mentioned structure, the predetermined factors of the vehicle such as the traveling speed and acceleration / deceleration of the vehicle, the turning direction of the vehicle and the vertical load acting on each wheel of the vehicle can be obtained. The control ratio of the plurality of vibrators is determined by the ratio determining means according to the state, and the drive control means drives and controls the plurality of vibrators in accordance with the determined control ratio. Therefore, if the control ratio of the vibration exciter, which has a high contribution to the vibration reduction, is increased, it is possible to efficiently reduce the vibration, and it is useful information for the occupant to know the driving condition of the vehicle. When a fluctuating load is input to the vehicle body, the control ratio of the vibration exciter corresponding to the suspension device to which the fluctuating load is input is reduced so that the vibration of a predetermined vibrating element caused by such a fluctuating load is reduced. By making it possible for the occupant to detect, it is possible to improve the maneuverability of the vehicle.

According to the third aspect of the present invention, the control ratio of the plurality of vibration exciters is determined according to the traveling speed of the vehicle.
In particular, when the traveling speed of the vehicle is in a region where the powertrain of the vehicle resonates due to the fluctuating load input from the wheels, the drive of the vibration exciter arranged near the powertrain is intensively controlled. The exciter force generated by the exciter placed near the powertrain has a greater effect of reducing the resonance vibration of the powertrain than the exciter force emitted by the exciter placed far from the powertrain. Therefore, it is possible to efficiently reduce the resonance vibration of the power train by intensively controlling the drive of the shaker arranged near the power train.

According to the fifth aspect of the present invention, the control ratio of the plurality of vibration exciters is determined according to the vehicle acceleration / deceleration, and is provided corresponding to the suspension device for the rear wheels especially when the vehicle is accelerating. The drive of the shaker
On the other hand, when the vehicle is decelerating, drive control of the vibrator provided corresponding to the front wheel suspension device is focused. When the vehicle is accelerating, a large vertical load is applied to the rear wheels compared to the front wheels, and when the vehicle is decelerating, a large vertical load is applied to the front wheels compared to the rear wheels. The shaker provided corresponding to the suspension device of the wheel on which a large vertical load acts is compared with the shaker provided corresponding to the suspension device of the wheel on which only a small vertical load acts.
Excitation force can be efficiently applied to the vehicle body. Therefore, when the vehicle is accelerating, the drive of the vibration exciter provided corresponding to the suspension device for the rear wheels is intensively controlled, and when the vehicle is decelerating, it is provided for the suspension device for the front wheels. By intensively controlling the drive of the vibration exciter, it is possible to efficiently reduce the vibration.

According to the seventh aspect of the invention, the control ratio of the plurality of vibrators is determined according to the state of the turning direction of the vehicle,
When the vehicle is turning, the shaker provided corresponding to the suspension device that suspends the wheels on the side opposite to the turning direction of the vehicle is intensively driven and controlled. When the vehicle is turning, a large vertical load is applied to the wheels on the side opposite to the turning direction as compared to the wheels on the same side as the turning direction. The vibration exciter provided corresponding to the suspension device of the wheel on which a large vertical load acts is more efficient than the exciter provided corresponding to the suspension device of the wheel on which only a small vertical load acts. Power can be applied to the car body. Therefore, it is possible to efficiently reduce the vibration by intensively controlling the drive of the vibration exciter provided corresponding to the suspension device that suspends the wheels on the opposite side of the turning direction of the vehicle.

According to the present invention, the control ratio of the plurality of vibrators is determined according to the state of the vertical load acting on each wheel of the vehicle, and particularly the magnitude of the vertical load acting on each wheel is determined. When there is a difference, the vibrator provided corresponding to the suspension device of the wheel on which a large vertical load is applied is drive-controlled intensively. As described above, the shaker provided corresponding to the suspension device of the wheel on which a large vertical load acts is compared with the shaker provided corresponding to the suspension device of the wheel on which only a small vertical load acts, Excitation force can be efficiently applied to the vehicle body. Therefore, it is possible to efficiently reduce the vibration by intensively controlling the drive of the vibrator provided corresponding to the suspension device of the wheel on which a large vertical load is applied.

The above-mentioned claim 3, 5, 7 or 9
In the invention described above, a variable load is input to the vehicle body from the wheels via a suspension device provided with an exciter that is not drive-controlled intensively, and the occupant is in a driving state, etc. of the vehicle from the vibration generated by the input variable load. Since it is possible to detect, it is possible to improve the maneuverability of the vehicle.

According to the tenth aspect of the invention, since the occupant can manually determine the control ratio of the plurality of vibrators, it is possible to perform the vibration reduction control according to the occupant's preference.

[0024]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of a vehicle vibration reducing apparatus according to an embodiment of the present invention, and FIG. 2 is a side view of a vehicle to which the present invention is applied. As shown in FIG. 2, an engine 2 is arranged at the front of the vehicle 1, and the engine 2 has an engine mount 3
It is attached to the vehicle body via. Further, the vehicle 1 is provided with four wheels 4 on the front, rear, left and right sides of the vehicle body (only the left side of the vehicle body is shown in FIG. 2), and each wheel 4 has a suspension device 5 (only the left side of the vehicle body is shown like the wheel 4). Suspended. Further, suspension mounts 6 are provided between the suspension devices 5 and the vehicle body, and the suspension devices 5 and the vehicle body are connected by the suspension mounts 6, respectively. Further, the vehicle 1 includes four wheel rotation speed sensors 7 (only the left side of the vehicle body is shown in FIG. 2) for detecting the rotation speed of each wheel 4, and a G sensor arranged at a predetermined position of the vehicle 1. And 8 are provided.

Each G sensor 8 constitutes a vibration sensor referred to in the present invention for detecting the vibration of a vehicle body constituent element at a predetermined position of the vehicle 1. In this embodiment, a vehicle body member supporting each suspension device 5 is provided. One for each of the suspension devices 5 to detect the vibration of the steering wheel, and one for the steering wheel 9 and the floor panel to detect the vibrations of the floor panel 9 and 6 in total. G sensors 8 (only four of which are shown in FIG. 2) are provided.

Each of the above suspension mounts 6 constitutes a vibration exciter according to the present invention. More specifically, as shown in FIG.
A first suspension mount 6FL provided for the suspension device that suspends the left front wheel, a second suspension mount 6FR provided for the suspension device that suspends the right front wheel, and a suspension device that suspends the left rear wheel. And a fourth suspension mount 6RR provided corresponding to the suspension device for suspending the right rear wheel, respectively. here,
The configuration of the suspension mount 6 will be described with reference to FIG. FIG. 3 is a sectional view showing the structure of the suspension mount 6.

The suspension mount 6 shown in FIG. 3 has a piezoelectric actuator portion 62 inside a rubber member 61 formed in an annular shape.
Be equipped with. The piezoelectric actuator portion 62 includes a stretchable portion 64 formed by stacking a large number of piezoelectric elements 63, an annular upper plate 65 fixed to the upper end portion of the stretchable portion 64, and a lower end portion of the stretchable portion 64. And a ring-shaped lower plate 66. Upper plate 65
From the inner peripheral portion of, a cylindrical inner cylinder 67 extends downward,
From the lower end of the inner cylinder 67, the bottom plate 68 is directed horizontally inward.
Is extended. The bottom plate 68 is welded to the upper surface of the upper bracket 5b of the coil spring 5a of the suspension device 5, and also the suspension strut 5c.
It is fixed to the upper end of. On the other hand, a cylindrical outer cylinder 69 extends upward from the outer peripheral portion of the lower plate 66, and the inner peripheral portion of the rubber member 61 is fixed to the outer peripheral surface of the outer cylinder 69. The outer peripheral portion of the rubber member 61 is fixed to the inner peripheral surface of the cylindrical portion 70 formed in a cylindrical shape. A flange 71 extends horizontally outward from the lower end of the cylindrical portion 70, and the flange 71 is fixed to the vehicle body member 10.

The piezoelectric actuator section 62 having the above structure
Generates a force that increases the distance between the upper plate 65 and the lower plate 66 due to the piezoelectric effect of each piezoelectric element 63 when the expansion portion 64 is energized, and releases this force when the energization is stopped. And acts to reduce the distance between the upper plate 65 and the lower plate 66. The suspension mount 6 is configured to generate an exciting force that changes the distance between the suspension device 5 and the vehicle body member 10 by alternately repeating the operation of the piezoelectric actuator portion 62.

Each suspension mount 6 constructed in this way
As shown in FIG. 2, for example, the instrument panel 11
The drive is controlled by the controller 12 as the drive control means in the present invention, which is arranged in the front part of the. As shown in FIG. 1, the controller 12 includes a reference signal generation means 13 and a drive signal generation means 14. The reference signal generation means 13 is based on the detection signal from each wheel rotation speed sensor 7 described above, and the first reference signal Sr1 associated with the rotation speed of the left front wheel and the second reference signal associated with the rotation speed of the right front wheel. Sr2, a third reference signal Sr3 associated with the rotational speed of the left rear wheel, and a fourth reference signal Sr4 associated with the rotational speed of the right rear wheel are each generated.

On the other hand, the drive signal generating means 14 drives the first drive signal Sc1 for driving the first suspension mount 6FL, the second drive signal Sc2 for driving the second suspension mount 6FR, and the third suspension mount 6RL. Third drive signal Sc3
And a fourth drive signal Sc4 for driving the fourth suspension mount 6RR, respectively. Further, the drive signal generating means 14 has a ratio changing means 15 for changing the control ratio of each suspension mount 6 in accordance with the predetermined information J indicating the state of the predetermined factor of the vehicle 1.

The internal structure of the drive signal generating means 14 will be described in detail below. FIG. 4 is a diagram showing an internal configuration of the drive signal generating means 14. As shown in FIG. 4, the drive signal generating means 14
While sequentially adjusting the reference signals Sr1 to Sr4 output from the above-mentioned reference signal generating means 13,
Drive control signals Sc1 to S for driving each suspension mount 6
The adaptive control unit 16 for generating c4 is provided.
Is the four adaptive filters F _{1 to} F ₄ each having a variable parameter (filter coefficient) for adjusting the phase and gain of each reference signal Sr _{1 to} Sr _4, and the coefficients of each adaptive filter F _{1 to} F ₄ are optimized. And an adapting mechanism 17 for converting the same. The adaptive algorithm used by the adaptive mechanism 17 for updating the coefficients of the adaptive filters F _{1 to} F ₄ is the least squares method, and the adaptive mechanism 17 applies the vibration detection signals Se 1 to Se 6 from the G sensors 8 described above. Based on a predetermined calculation, the coefficients of the adaptive filters F _{1 to} F ₄ are sequentially optimized so that the vibration of a predetermined vibration element is reduced at a predetermined position of the vehicle.

On the other hand, the control ratio changing means 15 of the drive signal generating means 14 selects a predetermined one of the reference signals Sr1 to Sr4 and outputs it to the adaptive adjusting section 16, and the adaptive adjustment. A second selection switch SW2 that selects and outputs a predetermined one of the drive control signals Sc1 to Sc4 from the unit 16 and a selection control unit 18 that controls the selection operation of both switches SW1 and SW2. The selection control unit 18 constitutes the ratio determination means in the present invention, determines the control ratio of each suspension mount 6 according to the predetermined information J indicating the state of the predetermined factor of the vehicle, and based on this determination. In order to control the selection operation of both switches SW1 and SW2 in synchronism with each other, in detail, by the first switch SW1, the n-th switch is selected.
When the (n = 1,2,3,4) reference signal Srn is selected, the n-th (n = 1,2,3,4) drive control signal Scn is selected by the second switch SW2 and vice versa. When the 1st switch SW1 does not select the nth reference signal Srn, the selection operation of both switches SW1 and SW2 is controlled so that the 2nd switch SW2 does not select the nth drive control signal Scn. In this embodiment, the control ratio of each vibration exciter 6 is changed by performing such a selection operation. Hereinafter, a specific selection operation will be described.

First, the ratio changing means 15 changes the suspension mounts 6FL, 6FR, 6R according to the traveling speed (vehicle speed) of the vehicle.
A case where the control ratio of L and 6RR is changed will be described. In this example, when the wheels 4 have improper balance adjustment, eccentricity, irregularity of uniformity, etc.
Vibration generated by a fluctuating load having a first-order wheel rotation frequency that is input to the vehicle body via the vehicle (hereinafter referred to as forced vibration of the first-wheel rotation), especially the fluctuating load is caused by bending, twisting, powertrain, etc. of the vehicle body. The purpose is to reduce vibration such as shaking that occurs when resonating with natural vibration. FIG. 5 is a diagram showing an example of characteristics of forced vibration of primary wheel rotation that occurs in the vehicle 1 shown in FIG. Figure 5
As shown by the solid line,
The vibration level sharply increases near 65 Km / h and around 85 Km / h. The sudden increase in the vibration level of the former is
This shows a shake vibration (hereinafter, referred to as a medium speed shake) generated by the resonance of the power train. The sharp increase of the latter vibration level is caused by the resonance of the vehicle body and the unsprung resonance of the suspension mount 6 (hereinafter, shake vibration). , High-speed shake).

FIG. 6 shows the flow of the control ratio changing operation of this example. First, in step S1, the selection control unit of the ratio changing unit 15
18 detects the vehicle speed V based on the vehicle speed information J, and in the next step S2, it is determined whether the vehicle speed V is 60 km / h or more.
When the vehicle speed V is less than 60 Km / h, it is determined that the level of forced vibration of the wheel rotation primary is small, and the process proceeds to step S3, in which the first and second switches SW1 and SW2 are set to all the reference signals Sr1 to Sr4. And all drive control signals S
Control is performed so that none of c1 to Sc4 is selected. In this case, none of the suspension mounts 6 is driven.

When the determination in step S2 is YES, that is, when the vehicle speed is 60 km / h or more, the process proceeds to step S4, and it is further determined whether the vehicle speed is 75 km / h or more. When the vehicle speed is 60 Km / h or more and less than 75 Km / h, it is judged that a medium-low speed shake is occurring, and it is decided to increase the control ratio of the first and second suspension mounts 6FL and 6FR arranged near the power train. Then, in step S5, the first and second switches SW1 and SW2 are controlled so that they select only the first and second reference signals Sr1 and Sr2 and the first and second drive control signals, respectively. In this case, only the first and second suspension mounts arranged near the power train are drive-controlled intensively.

If the determination in step S4 is YES, that is, if the vehicle speed is 75 km / h or higher, the process proceeds to step S6, and it is further determined whether the vehicle speed is 100 km / h or higher. When the vehicle speed is 75 Km / h or more and less than 100 Km / h, it is determined that a high-speed shake is occurring, and it is determined that the control ratios of the suspension mounts 6 are the same, and the process proceeds to step S7.
The second switches SW1 and SW2 are connected to all the reference signals Sr1 to Sr4 and all the drive control signals Sc1 to
Control is performed so that all Sc4 are selected. in this case,
All the suspension mounts 6 will be driven.

If the determination in step S6 is YES, that is, if the vehicle speed is 100 km / h or more, it is determined that the vibration level is low, and the process proceeds to step S8, in which all the first and second switches SW1 and SW2 are set. Reference signal S
Control is performed so that none of r1 to Sr4 and all drive control signals Sc1 to Sc4 are selected. In this case, none of the suspension mounts 6 is driven.

By controlling the drive of the suspension mount 6 as described above, it is possible to reduce the forced vibration of the primary wheel rotation to the level shown by the broken line in FIG. As described above, in this example, when the vehicle speed is in the region where the medium- and low-speed shakes occur, the efficiency is improved by focusing the drive control only on the first and second suspension mounts 6FL and 6FR arranged near the power train. The primary drive of wheel rotation can be reduced well. In addition, if the medium-low speed shake is occurring,
Since the fourth suspension mounts 6RL and 6RR are not driven, the vibration level is not unnecessarily reduced, and therefore the occupant can be made aware of the driving state (vehicle speed state) from the vibration state. It is also possible to improve the maneuverability of the.

Next, a case where the ratio changing means 15 changes the control ratio of each suspension mount 6 according to the acceleration / deceleration state of the vehicle will be described. FIG. 7 is a flowchart showing an operation of changing the control ratio according to the acceleration / deceleration state of the vehicle.

First, in step S11, the selection control section 18 detects the acceleration / deceleration state of the vehicle 1 based on the acceleration / deceleration information J of the vehicle, and in the next step S12, it is determined whether or not the vehicle 1 is accelerating. When the vehicle 1 is accelerating, it is determined that a larger vertical load is applied to the rear wheels than the front wheels, and
It is decided to increase the control ratio of the fourth suspension mounts 6RL and 6RR, and the process proceeds to step S13, and the first and second switches SW
1, SW2, these are the third and fourth reference signals S
Control is performed so that only r3, Sr4 and the third and fourth drive control signals Sc3, Sc4 are selected. In this case, it was provided corresponding to the suspension device that suspends the rear wheels,
3rd and 4th which can apply the excitation force to the vehicle body efficiently
Only the suspension mounts 6RL and 6RR are drive-controlled with priority.

If the determination in step S12 is NO, that is, if the vehicle 1 is not in the accelerating state, the process proceeds to step S14 and it is determined whether or not the vehicle 1 is decelerating. When the vehicle 1 is decelerating, it is determined that a larger vertical load is applied to the front wheels than to the rear wheels, and the first and second suspension mounts 6 are
Decide to increase the control ratio of FL, 6FR and make a decision in step S
In step 15, the first and second switches SW1 and SW2 are controlled so that they select only the first and second reference signals Sr1 and Sr2 and the first and second drive control signals Sc1 and Sc2, respectively. In this case, the first and second suspension mounts 6F provided corresponding to the suspension device for suspending the front wheels and capable of efficiently applying the exciting force to the vehicle body
Only L and 6FR will be drive-controlled intensively.

When the determination in step S14 is NO, that is, when the vehicle 1 is running at a constant speed, it is determined that there is no difference in the vertical load acting on each wheel 4, and each suspension mount 6
The control ratio is determined to be the same and the process proceeds to step S16, where the first and second switches SW1 and SW2 select all the reference signals Sr1 to Sr4 and all the drive control signals Sc1 to Sc4. To control. In this case, all suspension mounts 6 are driven.

In this example, when the vehicle 1 is accelerating, only the third and fourth suspension mounts 6RL and 6RR, which can efficiently apply an exciting force to the vehicle body in this case, are drive-controlled with priority. , When the vehicle 1 is decelerating, in this case, it becomes possible to efficiently apply the excitation force.
By mainly controlling the drive of only the second suspension mounts 6FL and 6LR, it is possible to efficiently reduce the vibration. Further, since the suspension mount is set so that the drive control is not performed when the vehicle 1 is in the acceleration / deceleration state, the vibration level is not unnecessarily reduced, and therefore the occupant can be informed of the driving state (acceleration / deceleration) from the vibration state. Since it is possible to recognize the (state), it is possible to improve the maneuverability of the vehicle.

Next, a case where the ratio changing means 15 changes the control ratio of each suspension mount 6 in accordance with the turning state of the vehicle will be described. FIG. 8 is a flowchart showing the operation of changing the control ratio according to the turning state of the vehicle.

First, in step S21, the selection control section 18 detects the turning state of the vehicle 1 based on the turning information J of the vehicle such as the lateral G of the vehicle and the steering signal, and in the next step S22, the vehicle 1 turns right. Is determined. When the vehicle 1 is turning right, it is determined that a larger vertical load is applied to the wheels on the left side of the vehicle than the wheels on the right side of the vehicle, and a decision is made to increase the control ratio of the first, third suspension mounts 6FL, 6RL. Then, the process proceeds to step S23, and the first and second switches SW1, S
W2 is the first and third reference signals Sr1, S
Control is performed so that only r3 and the first and third drive control signals Sc1 and Sc3 are selected. In this case, the first and the first devices provided corresponding to the suspension device for suspending the wheels on the left side of the vehicle body and capable of efficiently applying the vibration force to the vehicle body
Only the third suspension mounts 6FL and 6RL are drive-controlled intensively.

If the determination in step S22 is NO, that is, if the vehicle 1 is not making a right turn, the process proceeds to step S24, and it is determined whether the vehicle 1 is making a left turn. When the vehicle 1 is turning left, it is determined that a larger vertical load is being applied to the wheels on the right side of the vehicle than to the wheels on the left side of the vehicle, and it is decided to increase the control ratio of the second and fourth suspension mounts 6FR, 6RR. Then, in step S25, the first and second switches SW1 and SW2 are switched to the second and fourth reference signals Sr2 and Sr4 and the second and fourth drive control signals Sc.
Control so that only 2 and Sc4 are selected respectively. In this case, only the second and fourth suspension mounts 6FR and 6RR, which are provided corresponding to the suspension device for suspending the wheels on the right side of the vehicle body and can efficiently apply the excitation force to the vehicle body, are driven mainly. Will be controlled.

When the determination in step S24 is NO, that is, when the vehicle 1 is in a straight traveling state, it is determined that there is no difference in the vertical load acting on each wheel 4, and each suspension mount 6
The same control ratio is determined and the process proceeds to step S26, and the first and second switches SW1 and SW2 select all the reference signals Sr1 to Sr4 and all the drive control signals Sc1 to Sc4. To control. In this case, all suspension mounts 6 are driven.

In this example, when the vehicle 1 is turning to the right, drive control is focused on only the first and third suspension mounts 6FL and 6RL, in which case it is possible to efficiently apply an exciting force to the vehicle body. However, when the vehicle 1 is turning left,
In this case, by mainly controlling the drive of only the second and fourth suspension mounts 6FR and 6RR capable of efficiently applying the vibration force, it is possible to efficiently reduce the vibrations. Further, since the suspension mount that does not control the drive is set when the vehicle 1 is in the turning state, the vibration level is not unnecessarily reduced,
Therefore, the occupant can be made aware of the driving state (turning state) of the vehicle from the vibration state, and the maneuverability of the vehicle can be improved.

Next, a case where the ratio changing means 15 changes the control ratio of each suspension mount 6 according to the magnitude of the vertical load acting on each wheel will be described. FIG. 9 is a flowchart showing an operation of changing the control ratio according to the magnitude of the vertical load acting on each wheel 4.

First, in step S31, the selection control unit 18 determines the vertical load W _FL (vertical load of the left front wheel) and W _FR (vertical load of the right front wheel) of each wheel 4 based on the vertical load information J of each wheel 4. ), W _RL (vertical load on the left rear wheel) and W _RR (vertical load on the right rear wheel) are detected respectively, and in the next step S32, the magnitude of each vertical load W _FL , W _FR , W _RL , W _RR is detected. Determine whether all are equal. If all are equal, it is determined that the control ratios of the suspension mounts 6 are the same, and the process proceeds to step S33, where the first and second switches SW1 and SW2 are controlled to control all reference signals Sr1 to Sr4 and all drive signals. Signal S
Control is performed so that all of c1 to Sc4 are selected. In this case, all suspension mounts 6 are drive-controlled.

When the determination in step S32 is NO, that is, when the vertical loads W _FL , W _FR , W _RL , and W _RR are different in magnitude, the process proceeds to step S34, and the vertical load W _{FL of the} left front wheel is set. Is determined to be maximum, and if YES is determined, the control ratio of the suspension mount 6FL provided corresponding to the suspension device for suspending the left front wheel is increased, and the process proceeds to step S35, where Second switch SW1, SW2
Are controlled so that they select only the first reference signal Sr1 and the first drive control signal Sc1, respectively.
In this case, only the first suspension mount 6FL, which is provided corresponding to the suspension device in which the left front wheel is suspended and which can apply the exciting force to the vehicle body most efficiently, is drive-controlled intensively. .

If the determination in step S34 is NO, that is, if the vertical load W _{FL on} the left front wheel is not the maximum, the routine proceeds to step S36, where it is determined whether the vertical load W _{FR on the} right front wheel is maximum. If it is determined to be YES, it is determined to increase the control ratio of the suspension mount 6FR provided corresponding to the suspension device for suspending the right front wheel, and step S37 is performed.
To switch the first and second switches SW1 and SW2 to the second reference signal Sr2 and the second drive control signal S.
Control so that only c2 is selected. In this case, only the second suspension mount 6FR, which is provided corresponding to the suspension device in which the right front wheel is suspended and which can apply the exciting force to the vehicle body most efficiently, is drive-controlled intensively. .

If the determination in step S36 is NO, that is, if the vertical load W _FR of the right front wheel is not the maximum, the process proceeds to step S38 to determine whether the vertical load W _FL of the left rear wheel is maximum. If it is determined to be YES, it is determined to increase the control ratio of the suspension mount 6RL provided corresponding to the suspension device for suspending the left rear wheel, and step S39 is performed.
To switch the first and second switches SW1 and SW2 to the third reference signal Sr3 and the third drive control signal S.
Control to select only c3 respectively. In this case, only the third suspension mount 6RL, which is provided corresponding to the suspension device having the left rear wheel suspended therein and which can apply the exciting force to the vehicle body most efficiently, is focused and controlled. Become.

If the determination in step S38 is NO, that is, if the vertical load W _{RR on} the right rear wheel is the maximum, the suspension mount 6RR provided corresponding to the suspension device for suspending the right rear wheel. The control ratio is determined to be increased and the process proceeds to step S40, where the first and second switches SW1,
SW2 is controlled so that they select only the fourth reference signal Sr4 and the fourth drive control signal Sc4, respectively. In this case, only the fourth suspension mount 6RR, which is provided corresponding to the suspension device in which the right rear wheel is suspended and which can apply the exciting force to the vehicle body most efficiently, is focused and controlled. Become.

In this example, when there is a difference in the vertical load acting on each wheel 4, in this case it is possible to apply the exciting force to the vehicle body most efficiently. It is possible to efficiently reduce the vibration by drivingly controlling only the suspension mounts provided corresponding to the suspension device that suspends the.

Next, a case where the ratio changing means 15 changes the control ratio of each suspension mount 6 in response to an instruction from an occupant will be described. FIG. 10 is a diagram showing an outline of a manual ratio changing operation panel. In this example, a manual ratio changing operation panel 20 as shown in FIG. 10 is provided at a position where it can be operated by an occupant in the passenger compartment. The operation panel 20 has four operation buttons 21, 2
2, 23, 24 are provided. Each operation button 21, 22, 2
Normally, 3 and 24 are set to an on state, and when operated by an occupant, they are in an off state, and in that case, an off signal is output to the ratio changing means 15. Specifically, when the first operation button 21 is turned off, the first
The first off signal for stopping the driving of the suspension mount 6FL is the second when the second operation button 22 is turned off.
The second off signal for stopping the drive of the suspension mount 6FR is the third when the third operation button 23 is turned off.
The third off signal for stopping the drive of the suspension mount 6RL is the fourth when the fourth operation button 24 is turned off.
A fourth off signal for stopping the driving of the suspension mount 6RR is output.

The selection control section 18 of the ratio changing means 15 normally makes the control ratios of the suspension mounts 6 the same, and when an OFF signal is output from the manual ratio changing operation panel 20, it responds to the OFF signal. The drive control signal for driving the suspension mount and the reference signal for generating the drive control signal are not selected by the first and second switches SW1 and SW2, respectively. Both switches SW1 and SW
Control 2

As described above, in this example, the occupant can determine which of the suspension mounts 6 is to be focused on and driven according to the feeling.

Although the embodiment of the vehicle vibration reducing apparatus according to the present invention has been described above, the vehicle vibration reducing apparatus according to the present invention is not limited to the specific mode of the embodiment, and various modifications can be made. It is possible to do.

For example, in the above-described embodiment, when the control ratio of a plurality of suspension mounts is changed, no drive control signal is output to the suspension mounts that reduce the control ratio, but no drive control signal is output. It is also possible to reduce the control ratio of the suspension mount to which the drive control signal is output by reducing the level of the drive control signal instead of not outputting the drive control signal.

Further, in the above embodiment, the rotation speeds of the wheels are detected separately, and a plurality of reference signals corresponding to the rotation speeds of the wheels are generated based on the detected rotation speeds of the wheels. However, assuming that the rotation speed of each wheel is basically the same, only the rotation speed of one predetermined wheel is detected, and a plurality of references corresponding to the rotation speed of each wheel are based on the rotation speed of that wheel. A signal may be generated. In this case, since the cycles of the plurality of reference signals are all the same, when the rotation speed of each wheel is different, for example, when one of the wheels is a temper tire, it corresponds to the wheel of the temper tire. It is necessary to correct the frequency of the reference signal.

Further, when a chain is attached to the wheels, the characteristic of the fluctuating load input to the vehicle body from the wheels via the suspension device changes, so in that case, the order component of the reference signal is increased. It is better to make such corrections. Note that the flow in the case of performing such reference signal correction is shown in FIG.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a vehicle vibration reduction device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a vehicle to which the present invention is applied.

FIG. 3 is a sectional view showing a configuration of a suspension mount.

FIG. 4 is a diagram showing an internal configuration of drive signal generation means.

FIG. 5 is a diagram showing a characteristic of vibration generated by a fluctuating load having a primary rotation period of wheel rotation.

FIG. 6 is a flowchart showing an operation when the control ratio of each suspension mount is changed according to the traveling speed of the vehicle.

FIG. 7 is a flowchart showing an operation when the control ratio of each suspension mount is changed according to the acceleration / deceleration state of the vehicle.

FIG. 8 is a flowchart showing an operation when changing the control ratio of each suspension mount according to the turning state of the vehicle.

FIG. 9 is a flowchart showing an operation when the control ratio of each suspension mount is changed according to the vertical load acting on each wheel.

FIG. 10 is a diagram showing an outline of a control ratio changing operation panel.

FIG. 11 is a flowchart showing an operation when correcting a reference signal.

[Explanation of symbols]

1 vehicle 2 engine 3 engine mount 4 wheels 5 suspension device 6 suspension mount 7 wheel rotation speed sensor 8 G sensor 12 controller 15 control ratio changing means 18 selection control unit (control ratio determining means) 63 piezoelectric element F _{1 to} F ₄ adaptive filter SW1, SW2 selection switch Sr1 to Sr4 Reference signal Sc1 to Sc4 Drive control signal Se1 to Se6 Vibration detection signal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Norihiko Nakao No. 3 Shinchi Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) Shingo Harada No. 3 Shinchi, Fuchu-cho, Hiroshima Prefecture Mazda Corporation Within

Claims (10)

[Claims] 1. A vibration sensor for detecting a vibration of a predetermined vibration element of a vehicle, and a vibration force provided between each suspension device and a vehicle body corresponding to a plurality of suspension devices of the vehicle. Based on a vibration detection signal from the vibration sensor, a plurality of vibration generators generated and a plurality of the vibration detection signals from the vibration sensor are reduced so that vibration generated in the vibration element due to a fluctuating load input to the vehicle body from the wheels via the suspension device is reduced. Drive control means for controlling the drive of the individual shakers, wherein the drive control means determines a ratio for determining a control ratio of the plurality of shakers according to a state of a predetermined factor of the vehicle. A vibration reduction device for a vehicle, comprising: means for controlling the drive of the plurality of vibrators according to the control ratio determined by the ratio determination means. 2. The vibration reducing apparatus for a vehicle according to claim 1, wherein the predetermined factor is a traveling speed of the vehicle. 3. The ratio determining means determines that the traveling speed is
When the power train of the vehicle is in a region where the power train resonates due to the fluctuating load, the control ratio is determined so that the vibration exciter arranged near the power train is drive-controlled intensively. Claim 2 characterized by the above.
The vehicle vibration reduction device described. 4. The vibration reduction device for a vehicle according to claim 1, wherein the predetermined factor is a traveling acceleration / deceleration of the vehicle. 5. The exciter arranged corresponding to a suspension device for suspending a rear wheel of the vehicle is intensively driven and controlled by the ratio determining means when the vehicle is accelerating. In addition, when the vehicle is decelerating, the control ratio is determined so that the vibration exciter arranged corresponding to the suspension device for suspending the front wheels is drive-controlled intensively. The vibration reduction device for a vehicle according to claim 4, which is characterized in that. 6. The vehicle vibration reduction device according to claim 1, wherein the predetermined factor is a turning direction of the vehicle. 7. The control unit controls the ratio determining means so that the vibration exciter arranged corresponding to a suspension device for suspending wheels on a side opposite to a turning direction of the vehicle is drive-controlled intensively. The vibration reduction device for a vehicle according to claim 6, wherein the vibration reduction device determines a ratio. 8. The vibration reducing device for a vehicle according to claim 1, wherein the predetermined factor is a vertical load acting on each wheel of the vehicle. 9. The ratio determining means determines the control ratio so that the vibration exciter arranged corresponding to a suspension device for suspending a wheel on which a large vertical load is applied is drive-controlled intensively. The vibration reduction device for a vehicle according to claim 8, wherein the vibration reduction device is a vehicle vibration reduction device. 10. The vibration reduction device for a vehicle according to claim 1, further comprising control ratio operating means configured so that an occupant can manually operate the determination of the control ratio.