JPH04129847A - Active seat device for vehicle - Google Patents

Abstract

PURPOSE:To obtain a high level ride feeling with vehicle sickness restrained according to the individual difference of a person on board by grasping a seat input vibration and the viscera vibration characteristic of the individual person on board, and restraining the viscera vibration of the person on board, sat on a seat at the time of traveling, by the method of active canceling. CONSTITUTION:When a person on board sits on a seat (a), a viscera weight, a viscera spring constant, and a viscera damping coefficient are estimated based on a vibration input from a vibration input detection means (c) with a control object information setting means (d), and the frequency analysis of a viscera gain is made based on control object information with a viscera displacement frequency analysis means (e). At the time of traveling when vibration is inputted in the seat (a) via a body floor, a vibration input from the vibration input detection means (c) is frequency-analized with a vibration input frequency analysis means (f), the frequency analysis result of the viscera gain obtained at the time of sitting the seat of the person on board and that of the vibration input obtained at any time during traveling are compared with an exciter control means (g), and vibration in a low frequency region restraining a viscera vibration is given to an exciter (b) provided on the seat (a).

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an active seat device for a vehicle that improves passenger comfort.

(Prior Art) Conventionally, as a device for improving vehicle ride comfort, for example,
A suspension device described in Japanese Patent Application Laid-open No. 63-64808 and a vehicle interior noise reduction device described in Japanese Patent Application Laid-Open No. 64-1+2496 are known.

The former source suggests that when driving, a fluid actuator installed between the vehicle body and the wheels is used to control the movement of the sprung mass and unsprung mass in response to frequency vibrations that exceed the resonant vibration range of the sprung mass. Techniques for suppression are presented.

The latter conventional source describes a technology that reduces cabin noise such as engine noise and vibration noise by detecting cabin noise and reproducing from a speaker a noise canceling signal of the opposite phase, which is the inversion of the noise signal component. has been done.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional suspension device, the frequency vibration range exceeding the unsprung resonance vibration range (100
This method attempts to improve ride comfort by suppressing car body vibration at frequencies above 30 Hz), but it cannot reduce car body vibration at low frequency vibrations below 30 Hz, which are most valued for ride comfort. Frequency vibrations are transmitted.

In addition, although the above-mentioned conventional cabin noise reduction devices improve cabin comfort by reducing cabin noise, they do not improve the vibration aspect at all, and vibrations in all frequency ranges are transmitted to the occupants through the car body and seats. be done.

Therefore, one idea is to apply the active cancellation technology of the cabin noise reduction device to apply vibrations with the opposite phase of the seat input vibration to the seat using a vibrator, thereby making the seat still and improving riding comfort. In this case, even if the vibration of the passenger's body can be suppressed, when a frequency vibration near the resonance point of the passenger's internal organs is input, only the passenger's internal organs resonate, causing motion sickness and impairing ride comfort. .

The present invention has been made with attention to the above-mentioned problems, and an object of the present invention is to achieve a high level of ride comfort that suppresses motion sickness according to individual differences among occupants in a vehicle active seat device that applies vibration from the outside. The task is to

(Means for Solving the Problems) In order to solve the above problems, the active seat device for a vehicle of the present invention grasps the seat input vibration and the internal vibration characteristics of the occupants, and the internal organs of the occupant seated on the seat during driving. The structure is such that vibrations are suppressed using an ac-gain cancellation technique.

That is, as shown in the complaint correspondence diagram in FIG.
The vibration input detecting means C detects the vibration input transmitted to the seat a, and when the occupant is seated on the seat a, the vibration input detecting means C detects the internal weight, internal splash constant, internal internal organs based on the vibration input. Controlled object information setting means d for estimating a damping coefficient;
A visceral displacement frequency analysis means e that analyzes the frequency of the internal gain based on control object information, a vibration input frequency analysis means f that frequency-analyzes the vibration input from the vibration input detection means C, and a frequency of the internal displacement and the vibration input. The apparatus is characterized by comprising a vibrator control means 9 which compares the analysis results and applies vibrations to the vibrator to suppress internal vibrations.

(Function) When the occupant is seated on the seat a, the controlled object information setting means d estimates the weight of the internal organs, the constant of the internal organs, and the damping coefficient of the internal organs based on the vibration input from the vibration input detection means C, and determines the internal organs displacement frequency. The analysis means e performs a frequency analysis of the built-in gain based on the control object information.

During driving, when vibrations are input to the seat a through the vehicle floor, the vibration input from the vibration input detection means C is frequency-analyzed by the vibration input frequency analysis means f, and the vibration input from the vibration input detection means C is frequency-analyzed by the vibration input frequency analysis means f. The frequency analysis results of the internal gain performed when the occupant is seated in the seat are compared with the frequency analysis results of the vibration input that is performed at any time during driving.
The vibration is applied to the vibration exciter installed in the

(Example) Embodiments of the present invention will be described below based on the drawings.

First, the configuration will be explained.

FIG. 2 is an overall view showing an active seat device for a vehicle according to an embodiment of the present invention.

A seat 3 provided on the vehicle body floor 1 via support legs 2 includes a vibrator 4 that vibrates the seat 3 with an external vibration drive current, and a vibrator 4 that detects the vibration human force F transmitted to the seat 3. A load cell 5 (vibration input detection means) is provided.

and a vibration active cancellation controller 7 that inputs detection signals from the load cell 5 and the vehicle speed sensor 6, performs predetermined arithmetic processing, and outputs an excitation control signal;
An amplifier 9 converts the excitation control current from the vibration active cancellation controller 7 into an excitation drive current, and also converts an audio current from an audio device 8 installed in the vehicle interior into a body sonic excitation drive current. It is provided.

The vibration active cancellation controller has a cp
It is an electronic control circuit mainly based on a microcomputer having u, RAM, ROM, etc. When the occupant A is seated on the seat 3, the built-in type 1ffi m? , the visceral spring constant is 2. A controlled object information setting section (controlled object information setting means) that estimates the internal damping coefficient 02, and an internal organs displacement frequency analysis section (visceral displacement frequency analysis means) that performs frequency analysis of the internal gain X2/F based on the controlled object information m2+K2+C2. ), a vibration input frequency analysis unit (vibration input frequency analysis means) that frequency-analyzes the vibration human force F from the load cell 5, compares the frequency analysis results of the internal gain X2/F and the vibration human force F, and calculates the internal vibration. It has a vibrator control section (vibrator control means) which outputs an excitation control signal for suppressing vibration, in the form of a control program.

Next, the effect will be explained.

FIG. 3 is a vibration model diagram when occupant A is seated on seat 3, and FIG. FIG. 8 is a flowchart showing the flow of the vibration control processing operation during driving.

First, each step in FIG. 4 will be explained. It starts by turning on the ignition key switch. In step 40, the vehicle speed V is read from the vehicle speed sensor 6, and in step 41, the vehicle speed V reaches the stop judgment threshold V. If it is determined that the vehicle is at a stop, the process proceeds to step 42, where the vibration human force F is read from the load cell 5, and in step 43, the amount of vibration input information indicates that the occupant A is completely seated. It is determined whether the amount of information is sufficient to complete the process, and the vibration input F is read until YES is determined in step 43.

In step 44, the internal organ weight m2 is estimated based on the static characteristics of the vibrating human force F, and the internal organ splash constant is estimated by 2. A visceral damping coefficient 02 is estimated.

That is, the reaction force F of the vibrator 4 measured by the load cell 5
/xo exhibits a frequency characteristic as shown in Fig. 5, and from the static characteristics of this vibrating human force F, the body weight M including the internal organ weight m2 is determined, and this weight M is equal to the weight Nm+ excluding the internal organ type jt rn 2. Assuming that the visceral type ■m2 is the same, it is estimated by half the body weight M.

Further, based on the dynamic characteristics of the vibrating human force F shown in FIG. 5, it is estimated that the internal spring constant is 2 and the internal damping coefficient is 02.

In step 45, visceral resonances are calculated.

That is, the displacement X of the vibrator 4 measured by the load cell 5
. is X. −Xl+X2, which is obtained by measurement
. Based on the visceral weight m2 estimated in step 44, the visceral spring constant 2, and the visceral damping coefficient 02, the visceral resonance in the region of vibration frequency 30 Hz or less is calculated (FIG. 6).

In step 46, a frequency analysis of built-in gain x 2/F is performed.

That is, based on the vibration input characteristics shown in FIG. 5 and the visceral resonance characteristics shown in FIG. It is obtained by dividing the graph in Figure ÷ the graph in Figure 5).

In step 47, the frequency analysis result of built-in gain x 27F is stored and set in RAM (Random Access Memory).

Each step in FIG. 8 will be explained.

The vibration control processing operation during this running process has been completed as shown in Figure 5, and the frequency analysis results of the built-in gains X and /F are RA.
This is a process that is started after the memory setting is made in M.

In step 80, the human vibration input F is read from the load cell 5, and in step 81, the frequency of the vibration input F that has been read is analyzed.

That is, the input from the load cell 5 is overlap-sampled, and as shown in the frequency characteristics of FIG. 9, a value close to that obtained by frequency decomposition is obtained.

In step 82, based on the frequency analysis result of internal gain x 27F shown in Fig. 7 and the frequency analysis result of the vibration input F, internal vibration x 2 (acceleration value due to 2 same machine parts of internal displacement x 2) is analyzed. be done.

That is, internal organ displacement x 7 is obtained from the two frequency analysis results, and by differential processing of this internal organ displacement x 2, internal organ vibration is estimated as shown by the dotted line characteristic in FIG.

In step 83, a command is output to create active cancel vibration, which is a vibration with opposite phase and same amplitude, for the internal vibration characteristics determined in step 82, and to obtain this vibration by the vibrator 4.

That is, the active cancel vibration has the characteristics shown in the dashed line in FIG. 10, and due to the canceling effect of canceling the internal vibration, the level of the internal vibration x is lowered while being kept flat.

Note that input from the audio device 8 to the vibrator 4 is performed on a time base.

As explained above, in the vehicle active seat device of the embodiment, the following effects can be obtained.

■ The input vibration F to the seat 3 and the visceral vibration characteristics of each occupant are ascertained through pre-processing when the occupant is seated, and the visceral vibration of the occupant A seated on the seat 3 during driving is detected in the low frequency range (2 to 30H2).
), it is possible to achieve a high level of ride comfort that suppresses motion sickness depending on the individual differences of the occupant A.

(2) Since input from the audio device 8 is also provided to the vibrator 4 on a time base, the vibrator 4 can be used both for internal vibration suppression and hozoisonic.

Although the embodiment has been described above based on the drawings, the specific configuration is not limited to this embodiment.

For example, in the embodiment, an example is shown in which the weight of internal organs is assumed to be half of the whole body weight, but the weight ratio of internal organs may be changed for each body weight to more accurately estimate the weight of internal organs.

(Effects of the Invention) As explained above, in the present invention, in a vehicle active seat device that applies vibration from the outside, the seat input vibration and the internal vibration characteristics of each occupant are grasped, and the occupant is seated in the seat during driving. Since the structure is configured to suppress the internal vibrations of the occupant by active cancellation, it is possible to achieve a high level of ride comfort that suppresses motion sickness depending on individual differences among the occupants.

[Brief explanation of drawings]

Fig. 1 is a complaint diagram showing the active seat device for a vehicle of the present invention, Fig. 2 is an overall view showing the active seat device for a vehicle according to the embodiment, and Fig. 3 is a vibration model diagram when an occupant is seated on the seat. , Figure 4 is a flowchart showing the flow of pre-processing operations performed by the vibration active cancellation controller when an occupant sits on the seat, Figure 5 shows the vibration input characteristics when sitting on the seat, and Figure 6 shows the vibration input characteristics in the low frequency range. The internal resonance characteristic diagram, Figure 7 is the frequency characteristic diagram of the internal gain, Figure 8 is a flowchart showing the flow of the vibration control processing operation during driving, Figure 9 is the vibration input characteristic diagram during driving, and Figure 10 is the internal resonance characteristic diagram. It is a diagram of internal vibration characteristics. a... Seat b... Vibrator C... Vibration input detection means d... Controlled object information setting means e... Internal displacement frequency analysis means f... Vibration manual frequency analysis means 9...・Exciter control means

Claims (1)

[Scope of Claims] 1) A vibrator provided in the seat; a vibration input detection means for detecting vibration input transmitted to the seat; Controlled object information setting means for estimating a spring constant and internal damping coefficient; Internal displacement frequency analysis means for frequency analysis of built-in gain based on the controlled object information; Vibration input for frequency analysis of vibration input from the vibration input detection means. An active vehicle for a vehicle, comprising: a frequency analysis means; and an exciter control means that compares the frequency analysis results of internal organ displacement and vibration input and applies vibration to the vibrator to suppress internal internal vibration. sheet equipment.