JPH07186805A - Seat controller in vehicle - Google Patents

Abstract

PURPOSE:To rationalize arrangement relationship between an elastic member for holding a seat and a actuator for giving the seat vibration-reducing-vibration. CONSTITUTION:An elastic member 5 and an actuator 4 for outputting a vibration-reducing-vibration are interposed between a car body 1 and a seat 3. A vibration-reducing-vibration is generated by a control unit U, by employing the vertical acceleration of an unspringing weight, which is detected by a sensor S1, as a reference signal while the vibration-reducing-vibration is rationalized so that the vertical acceleration of the seat 3, which is detected by a sensor S2, may become small. A plurality of elastic members 5 can be arranged in dispersion for a single seat 3, while only one actuator 4 is required. However, a plurality of actuators 4 can be arranged in dispersion for the single seat 3. Moreover, the actuators 4 and the elastic members 5 may be arranged in series.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat control system in which the vibration of the seat is reduced.

[0002]

2. Description of the Related Art Various types of vehicles have been proposed that reduce vibrations by utilizing the interference effect of vibrations, and those that reduce noise and vibrations in the passenger compartment have already been put into practical use. As one of the vibration reduction methods utilizing this interference, it has been proposed to reduce the vibration of the seat in order to improve the riding comfort.

FIG. 22 of Japanese Patent Laid-Open No. 3-219139 discloses an actuator for outputting a reducing vibration between a vehicle body and a seat, which is used for the vibration of the vehicle body and the vibration of the seat. In order to prevent the resonance between the vehicle body and the sheet, a comparison is made. Further, FIG. 23 of this publication also discloses a structure in which an actuator is installed between the unsprung weight and the unsprung weight to prevent the vibration of the unsprung weight from being transmitted to the unsprung weight. Has been done. Furthermore, this publication
While the reduction vibration is generated based on the reference signal indicating the vibration of the vibration source, the adaptive control for optimizing the reduction vibration is performed so that the error signal indicating the vibration of the member for which vibration reduction is required becomes small. It is disclosed.

Japanese Unexamined Patent Publication No. 4-129847 discloses a sea
It is disclosed that the vibration of the seat is controlled on the basis of the characteristics (built-in gain) of a person sitting on the seat.

The above-mentioned seat control ultimately improves the riding comfort, but in order to improve this riding comfort, suspension control is performed in order to reduce the vibration generated by the input from the road surface as a vibration source during running. It is also proposed. For example, in the active suspension, the damping force of the suspension damper is controlled so that the vertical acceleration acting on the vehicle body is reduced, and the internal hydraulic pressure of the vehicle height adjusting cylinder device is also controlled.

[0006]

By the way, in the case where the vibration of the sheet is reduced by the interference of the vibration, the actuator for imparting the reducing vibration to the sheet has a seat. It is required to be installed between the car and the car body. Further, in order to sufficiently reduce the vibration, it is required to mount the seat on the vehicle body so as to be vibrated by receiving the reducing vibration from the actuator. An elastic member is required to be installed between them.

As described above, when the actuator and the elastic member are installed between the seat and the vehicle body, the seat for one person is considerably large, so that the actuator and the elastic member are elastic. In order to effectively reduce the vibration of the sheet and reduce the cost, how to arrange the members and
Further, there is a problem in securing a space for arranging the actuator and the elastic member.

The present invention has been made in consideration of the above circumstances, and a first object thereof is a vehicle seat control device capable of reducing the vibration of the seat while reducing the cost. To provide.

A second object of the present invention is to provide a vibration control device for a seat, which can reduce the vibration of the seat more effectively and appropriately.

A third object of the present invention is to provide a vibration control device for a seat, which can minimize the space required for reducing the vibration of the seat.

[0011]

In order to achieve the first object, the present invention has the following structure.
That is, the sheet is attached to the vehicle body through a plurality of elastic members arranged in a distributed manner so that the sheet can move a predetermined amount with respect to the vehicle body within the elastic displacement range of the elastic member. One actuator for giving a reducing vibration to the seat is installed between the seat and the vehicle body.

In order to achieve the second object, the present invention has the following structure. That is, the sheet is attached to the vehicle body via the elastic member,
A plurality of actuators are set so as to be able to move a predetermined amount with respect to the vehicle body within the range of elastic displacement of the elastic member, and between the sheet and the vehicle body, vibration reducing vibration is applied to the sheet. Are installed in a distributed manner with respect to each other,
It has such a configuration.

In order to achieve the third object, the present invention has the following structure. That is, the sheet is attached to the vehicle body via the elastic member,
The actuator is set so as to be able to move a predetermined amount with respect to the vehicle body within the range of elastic displacement of the elastic member, and an actuator is installed between the sheet and the vehicle body for giving a reducing vibration to the sheet. The elastic member and the actuator are
Are connected in series with each other between the vehicle and the vehicle body,
It has such a configuration.

[0014]

According to the invention described in claim 1, 1
Since only one expensive actuator is required for each sheet, a cost-effective one can be obtained.
Further, since the seat is attached to the vehicle body by a plurality of elastic members arranged in a dispersed manner, it is preferable for surely attaching and holding the seat to the vehicle body.

According to the invention described in claim 2,
Since the reduction vibration is applied to the seat by a plurality of actuators that are arranged in a distributed manner, it is possible to prevent a situation where the seat vibration is only partially reduced, and The vibration of the sheet can be effectively reduced over the entire sheet.

According to the third aspect of the invention, since a plurality of actuators are controlled by one control signal, only one control system is required, which simplifies the control and reduces the cost. It will be preferable.

According to the structure described in claim 4, since the plurality of actuators are controlled by the control signals which are independent from each other, the optimum vibration for reduction is given to each separated position of the seat. It is possible to reduce the vibration of the sheet more effectively, which is preferable.

According to the fifth aspect of the present invention, the elastic member and the actuator are connected in series with each other and are interposed between the seat and the vehicle body. Therefore, the actuator and the elastic member are connected to each other. This is preferable in order to minimize the disposing space of.

By adopting the structure as described in claim 6, the vibration for reducing can be made appropriate while watching the vibration of the sheet, and the effect of reducing the vibration of the sheet can be sufficiently enhanced. .

With the structure as described in claim 7, the vibration direction of the reducing vibration by the actuator, that is, the operating direction of the actuator and the seat vibration detected by the seat vibration detecting means are detected. By making the vibration directions different from each other, it is preferable to reduce the restriction on the positional relationship between the actuator and the sheet vibration detection means.

With the structure as described in claim 8, the actuator is composed of a piezoelectric element which is excellent in responsiveness and can generate a large force, whereby the vibration of the sheet is sufficiently reduced. It is preferable for doing so.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, 1 is a vehicle body, 2 is an unsprung weight, 3 is a seat, and 3 is a seat cushion 3.
It is composed of a and a seat back 3b. An actuator 4 that outputs a vibration for reduction and an elastic member 5 such as rubber are interposed between the vehicle body 1 and the seat 3. The unsprung weight 2 and the vehicle body 1 are connected by a suspension device 6, and the suspension spring has a reference numeral 6a.
And the suspension damper is indicated by reference numeral 6b.

The seat 3 shown in FIG. 1 is for one person, that is, for a driver's seat or a passenger seat. As shown in FIG. 2, a total of four elastic members 5 are provided for one sheet 3. More specifically, the elastic members 5 are dispersedly arranged in a substantially horizontal plane, and are located at four corners in the front, rear, left, and right of (the seat cushion 3a of) the sheet 3. Further, only one actuator 4 is provided for one sheet 3, and it is located substantially at the center of (the sheet cushion 3a of) the sheet 3. In addition, sheet 3
Is normally attached to the vehicle body 1 through a pair of left and right seat trails.
The elastic member 5 may be interposed between the vehicle body 1 and the vehicle body 1.

The actuator 4 may be appropriately selected as long as it can apply a vibration for reduction, that is, an external force to the sheet 3, but in the embodiment, a piezoelectric element is laminated. A laminated piezoelectric actuator 4 (trade name: Piezo Stack-NTK) is used. As is known, this piezoelectric element expands or contracts in accordance with an applied voltage, and controls the applied voltage so as to be in accordance with the reducing vibration.
It can be given to G.3. In the embodiment, in order to apply the reducing vibration to the sheet 3 in the vertical direction, the piezoelectric elements forming the actuator 4 are laminated in the vertical direction (expanding and contracting in the vertical direction).

In FIG. 1, U is a control unit for performing adaptive control, which will be described later. Signals from the two sensors S1 and S2 are input to the control unit U, while the control unit U outputs a control signal corresponding to a predetermined vibration for reduction to the actuator 4. It The sensor S1 detects the vibration of the unsprung weight as a vibration source as a reference signal. The reference signal is, for example, the displacement of the unsprung weight, the displacement speed (for example, obtained by differentiating the displacement), the acceleration (for example, obtained by differentiating the displacement speed), the external input applied to the unsprung weight (for example, the vehicle body of the suspension). Input to the mounting part, stress acting on the piston rod such as suspension damper, etc.),
Or one of the internal pressure of the suspension damper
Can be one.

The displacement as the reference signal, the displacement velocity, the acceleration, and the external input may be in the up-down direction or the front-rear direction, but generally, the up-down direction which causes a large degree of discomfort to the occupant is selected. preferable. However, depending on the vibration mode, the vibration in the front-rear direction may be greatly uncomfortable, and at this time, the vibration in the front-rear direction may be detected. Further, as shown by the broken line in FIG. 1, by mounting the sensor S2 on the seat back 3b, the seat back 3b is used while being inclined in the front-back direction while detecting the longitudinal acceleration by the sensor S2. It is also possible to substantially detect the vertical acceleration.

The vertical acceleration finally input to the vehicle body 1 from the unsprung mass 2 which receives an input from the road surface during traveling gives an uncomfortable vertical vibration to the seat 3. It is preferable to arrange the sensor (S1) so as to detect the vertical acceleration directly input to the vehicle body 1 among the vertical acceleration acting on the unsprung weight. More specifically, since the cylinder of the suspension damper is usually connected to the unsprung weight and the piston (piston rod) is connected to the vehicle body 1, vertical acceleration is applied to this piston (for example, the upper end of the piston rod). A sensor for detecting may be provided. In particular, when the sensor S1 is provided on the piston, it is preferable to use it as a reference signal when reducing unsprung resonance vibration caused by friction between the piston and the cylinder.

As is apparent from the above description, the sensor S2 for detecting the vibration of the sheet 3, that is, the error signal, is preferably a sensor for detecting the vertical acceleration. It is preferable that the reference signal and the error signal have the same type of vibration detection mode. For example, when the reference signal is vertical acceleration, the error signal is also preferably vertical acceleration, and when the reference signal is longitudinal acceleration, the error signal is also preferably longitudinal acceleration. However, as described above, by selecting the mounting position of the sensor S2 as the seat back 3b used in a posture inclined in the front-rear direction, the vertical acceleration is sufficiently added while the longitudinal acceleration is detected. An error signal can be detected. In the embodiment, the reference signal (vertical acceleration), the error signal (vertical acceleration), and the operating direction of the actuator 4 are set to be the vertical direction.

As shown in FIG. 2, the control unit U is roughly divided in its internal structure and has a digital adaptive filter 21.
, Transfer function setting block (step) 22, convergence coefficient setting block 23, and filter coefficient rewriting block 2
4 and 4. The control unit U basically generates the reduction vibration based on the reference signal from the sensor S1 and optimizes the reduction vibration so that the error signal detected by the sensor S2 becomes small. . This optimization of the vibration for reduction is performed by sequentially rewriting the coefficient of the adaptive filter 21, and if this rewriting is performed, the filter coefficient rewriting block is generated based on the signals from the transfer function setting block 22 and the convergence coefficient setting block 23. 24.

The transfer function setting block 22 optimizes the reducing vibration in consideration of the transfer characteristic (delay characteristic) between the actuator 4 which outputs the reducing vibration and the sensor S2 which detects the error signal. This is because the convergence coefficient setting block 23 is for reducing the error signal with a predetermined step size. Since the control of the optimization itself by the control unit U is performed in the same manner as the conventionally known control of optimization, further detailed description will be omitted. A general least-squares method can be applied as an adaptive algorithm for optimization.

The control procedure of the adaptive control using the error signal is shown in the flowchart of FIG. In FIG. 4, P indicates a step, and the control signal calculated in P5 corresponds to the reduction vibration.

The vibration of the sheet 3 is reduced by such optimization control. At this time, since the reference signal almost directly indicates the road surface input to the unsprung weight, there is no influence of noise and the response is excellent. Vibration can be sufficiently reduced. The frequency range of the vibration to be reduced is, for example, a frequency corresponding to the unsprung first resonance vibration (usually around 10 to 13 HZ) or a frequency corresponding to the unsprung second resonance vibration (usually around 16 to 18 HZ). ) And either or both.

The reference signal may also indicate the vibration of the engine as the vibration source. The reference signal in this case is, for example, the engine speed,
External force acting on the engine (main body) (for example, vertical acceleration, longitudinal acceleration, bending stress, etc.) and internal hydraulic pressure of the liquid-filled engine mount can be used. The frequency range of the vibration to be reduced may be, for example, a frequency corresponding to the idle speed or the engine speed in the vicinity thereof.

FIG. 5 shows another embodiment of the present invention. The same components as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the seat 33 (only the seat cushion is modeled and shown in FIG. 5).
Is for the rear seats and is for two persons or three persons who extend in the left-right direction (vehicle width direction), and the unsprung weight 2 and the suspension device 6 are shown as a left and right pair.

In the present embodiment, the actuator 4 and the elastic member 5 are interposed between the seat 33 and the vehicle body 1 in a state of being connected in series with each other. And actuator 4
The number of sets of the elastic member 5 and the elastic member 5 is plural, for example, four sets are provided,
It is arranged at four corners on the front, rear, left and right of the sheet 3. It should be noted that the number of sets of the actuator 4 and the elastic member 5 should be one set or two or more sets at the left and right central portions of the sheet 3 as compared with the case shown in FIG. You can

As described above, by arranging the actuator 4 and the elastic member 5 in series, as compared with the case where they are arranged in parallel with each other, the actuator along the surface along the sheet 3 is concerned. The installation area occupied by 4 and the elastic member 5 is greatly reduced. The effect of reducing the installation area is
It becomes more remarkable as the number of actuators 4 and elastic members 5 increases. Further, the actuator 4 and the elastic member 5 are previously connected to each other to form an integrated body, and the connected body is interposed between the seat 33 and the vehicle body 1. It is also advantageous in terms of workability in assembling the connector 4 and the elastic member 5.

A control unit U for performing the above-mentioned adaptive control.
The right and left pairs are provided, and correspondingly, the left and right pairs of the sensor S1 for detecting the reference signal and the sensor S2 for detecting the error signal are also provided. The control unit U on the left side exclusively controls the actuator 4 on the left side, and the control unit U on the right side exclusively controls the actuator 4 on the right side. By independently controlling each actuator 4 in this manner, it is preferable in order to effectively reduce the vibration of the sheet 3 over the entire sheet.

Instead of individually controlling each actuator 4 as shown in FIG. 5, one control unit U is provided, and a plurality of control units U, that is, a common control signal, are used. It is also possible to control the actuator 4. This case is preferable in terms of simplification of the control system and cost reduction.

Although the embodiments have been described above, the present invention is not limited to this, and includes the following cases, for example. (1) The adaptive control may be performed without using the error signal from the sensor S2 (the adaptive filter shown in FIG. 3 is a fixed type). (2) The control for reducing the sheet vibration detected by the sensor S2 may be performed by feedback control instead of the adaptive control shown in the embodiment. (3) Since vibration from the unsprung weight as a vibration source occurs during traveling, adaptive control is performed using the engine vibration as a reference signal while the vehicle is stopped or at low vehicle speed, and the unsprung weight vibration is used as a reference signal during traveling. It is also possible to perform adaptive control.

[Brief description of drawings]

FIG. 1 is an overall system diagram showing an embodiment of the present invention.

FIG. 2 is a top view showing an arrangement example of an actuator and an elastic member with respect to a sheet.

FIG. 3 is a diagram showing a control system of vibration reduction control.

FIG. 4 is a flowchart showing the control content of vibration reduction control.
To.

FIG. 5 is an overall system diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1: Vehicle body 2: Unsprung weight 3: Sheet 4: Actuator 5: Elastic member 33: Sheet U: Control unit (for vibration reduction) S1: Sensor (for reference signal) S2: Sensor (error) (For signals)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B60N 2/50 F16F 15/02 A 9138-3J G01H 17/00 Z G10K 11/16 11/178

Claims (8)

[Claims] 1. A seat is mounted on a vehicle body through a plurality of elastic members dispersedly arranged so as to be movable by a predetermined amount with respect to the vehicle body within a range of elastic displacement of the elastic members. A seat control device for a vehicle, wherein one actuator for applying a reducing vibration to the seat is installed between the seat and the vehicle body. 2. The seat is mounted on the vehicle body via an elastic member so that the seat can move a predetermined amount with respect to the vehicle body within the range of elastic displacement of the elastic member. A plurality of actuators for applying a reducing vibration to the seat are installed between the two in a state of being dispersedly arranged between the seats.
Control device. 3. The actuator according to claim 2, wherein the plurality of actuators are controlled by the same control signal. 4. The actuator according to claim 2, wherein the plurality of actuators are controlled by control signals which are independent of each other. 5. The seat is attached to the vehicle body via an elastic member so that the seat can move a predetermined amount with respect to the vehicle body within a range of elastic displacement of the elastic member. An actuator for giving a reducing vibration to the seat is installed between the seats, and the elastic member and the actuator are connected in series with each other between the seat and the vehicle body. A vehicle seat control device characterized by the above. 6. The sheet vibration detecting means according to claim 1, further comprising a sheet vibration detecting means for detecting the vibration of the sheet, wherein the actuator is the sheet vibration detecting means. It is controlled to reduce the vibration of the sheet detected by. 7. The vibrating direction of the sheet detected by the sheet vibration detecting means and the vibrating direction of the reducing vibration applied by the actuator are set to be different from each other. What you have. 8. The actuator according to claim 1, wherein the actuator is composed of a piezoelectric element.