JPH0141955Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for preventing body vibration of a vehicle.

Generally, when a vehicle is idling, the vibration of the vehicle body due to the engine speed comes close to the resonance point of the vehicle body, causing the vehicle body to vibrate greatly, resulting in poor ride comfort and problems such as increased interior noise due to vehicle vibration. .

This is a particularly noticeable phenomenon in front-wheel drive vehicles, and is an important problem to be solved.

The present invention aims to solve these problems, and aims to provide a vehicle body vibration reduction device that can reduce vehicle body vibration by equipping the vehicle with an exciter. do.

Therefore, in order to reduce the vibration of the car body in a vehicle equipped with an audio amplifier for a car stereo, the car body vibration reduction device of the present invention is equipped with a vibrator for canceling out the vibration of the car body, and an excitation machine for canceling the vibration of the car body. and a signal source for supplying an excitation signal to the machine, and the excitation unit is provided between the signal source and the excitation machine in order to cause the excitation machine to generate an excitation force having an opposite phase to the vibration of the vehicle body. A phase control means for controlling the phase of the vibration signal and the audio amplifier are interposed, and a separator for dividing the output of the audio amplifier into the vibration signal of the vibration exciter and the audio signal is connected to the audio amplifier and the audio amplifier. It is characterized by being interposed between it and the shaker.

Hereinafter, embodiments of the present invention will be explained with reference to the drawings. Figures 1 to 35 show a vehicle body vibration reduction device as a first embodiment of the present invention, and Figure 1 schematically shows how it is installed on a vehicle. Longitudinal cross-sectional view, 2nd
Figure 3 is a block diagram showing its overall configuration, Figure 3 is a flowchart showing its control process, Figure 4 is a vertical cross-sectional view showing its vibrator with a hold mechanism, and Figures 5 to 7 are its excitation Figures 8 to 15 are schematic diagrams showing modified examples of the vibrator, and Figures 16 and 17 are schematic diagrams showing other modified examples of the vibrator. Figure 18 is a graph showing the characteristics of the vibration exciter shown in Figures 16 and 17. Figure 19 is a schematic diagram showing the vibration exciter using a battery. A schematic diagram showing the waterproof structure of the vibration exciter, Figures 23 to 29 are schematic diagrams showing the installation state of the vibration exciter,
Figures 30 to 34 are schematic diagrams showing the mounting position of the vibration exciter, Figure 35 is a graph showing its characteristics, and Figures 36 and 37 are vehicle body vibration reduction as the second embodiment of the present invention. Fig. 36 is a block diagram of the apparatus, and Fig. 37 is a flowchart showing its control process.

First, to explain the vehicle body vibration reduction device as the first embodiment of the present invention, as shown in FIG. 1 is supported.

A vibrator 2 is attached to the front end of the body frame 1, and the operation of the vibrator 2 causes the vehicle body B to vibrate as required through the body frame 1.

By the way, the vibrator 2 is driven by the configuration shown in FIG.

That is, an ignition pulse a generated in the engine E as a signal source and serving as an excitation signal for the vibrator 2 is input to the waveform shaping section 3, the noise part of the ignition pulse a is removed, and the ignition pulse a is shaped. A rectangular wave b is obtained.

This rectangular wave b is input to the SIN wave generator 4,
Sine (SIN) wave c according to the timing of square wave b
occurs.

The SIN wave c is input to the phase control unit 5 as a phase control means for controlling the phase of the excitation signal, and delays or advances the phase by the required amount to obtain the optimal signal for the required excitation in the exciter 2. Adjusted to phase.

The phase-adjusted SIN wave d is input to the gain control unit 6, and is adjusted to the optimal gain for the required vibration in the vibration exciter 2.

The SIN wave e whose phase and gain have been adjusted in this manner is input to the amplifier 7, where the power is amplified to a level sufficient to operate the vibrator 2.

By the way, the amplifier 7 is constituted by an audio amplifier for a car stereo that is normally installed in a vehicle.

That is, the amplifier 7 is interposed between the gain control unit 6 and the vibrator 2, and is also incorporated into the system of the car stereo 54.
The amplifier 7 is configured to receive the SIN wave e output from the gain control section 6 and an audio signal for the car stereo 54.

The amplifier 7 is configured to amplify a composite signal of the SIN wave e and the audio signal, and the amplified composite signal is input to a separator 52 connected to the output side of the amplifier 7. ing.

The separator 52 is composed of a low-pass filter 52a and a high-pass filter 52b, and the low-pass filter 52a has a frequency of, for example, 0 to 40 Hz.
The high pass filter 52b passes the signal of
For example, it is designed to pass signals of 40Hz or higher.

As a result, the composite signal is divided into an excitation signal of 40Hz or less and an audio signal of 40Hz or more,
The signals are input to the vibrator 2 and car stereo speaker 53, respectively.

The vibration exciter 2 is activated by the output of the amplifier 7 to vibrate the vehicle body B.

Incidentally, as described above, the phase and gain of the input signal to the vibrator 2 are adjusted in the controller 8, the phase control section 5, and the gain control section 6, which are configured by the microcomputer M.

That is, the controller 8 includes a vehicle speed sensor 9.
and an engine rotation speed sensor 10 are connected, and phase control and gain control are performed via the controller 8 based on the vehicle speed V and engine rotation speed N detected by these sensors.

The controller 8 also includes a hold mechanism 11.
is connected, and the operation of the vibrator 2 can be stopped and locked by a signal from the controller 8.

Further, a vehicle speed control section 12 is connected to the vehicle body B, and the vehicle speed control section 12 is configured to control the speed of the vehicle to a constant value based on the vehicle speed V detected by the vehicle speed sensor 9.

By the way, SIN as an input signal to the vibrator 2
Phase control and gain control of wave e are performed as shown in the flowchart of FIG.

As shown in FIGS. 2 and 3, the vehicle speed V detected by the vehicle speed sensor 9 is input to the controller 8,
Step B1 is executed and the vehicle speed V reaches the predetermined speed.
It is determined whether V is greater than ₀ .

This vehicle speed V ₀ is set to the minimum speed of the normal vehicle speed measurement limit.

If the vehicle speed V is greater than the vehicle speed _V0 , the amplifier 7 is turned off in step B6, and then in step B7 it is determined by the hold mechanism 11 whether the vibrator 2 is locked.

If it is determined that the lock is locked in step B7, the locked state is maintained in step B9, and if it is determined that the lock is not locked, a lock instruction signal is sent to the hold mechanism 11 in step B8. The signal is transmitted from the controller 8, and the vibrator 2 is locked.

In steps B8 and B9, after the lock state is completed, a new control process is executed.

In step B1, the vehicle speed V is set to the set vehicle speed V ₀
If it is determined that the following is true, proceed to step B2.
At , the engine speed N is determined.

That is, based on the detection signal of the engine rotation speed sensor 10, it is determined whether the engine rotation speed N is between the set rotation speed N1 and the set rotation speed N2 (N2>N1), and if N2≧N≧N1 is satisfied. Then, steps B3, B4, and B5 are executed.

In step B3, a map corresponding to the vehicle speed V and engine rotation speed N is selected from various maps in which phase φ and gain F are stored in advance, and in step B4, a map corresponding to the vehicle speed V and engine rotation speed N is selected. The gain F is determined, and the phase φ and gain F are output to the vibrator 2 in step B5.

By the way, the above-mentioned map is formed by values set so that the excitation force acting on the vehicle body B by the vibration exciter 2 is in opposite phase to the vibrations caused by the engine E of the vehicle body B.

That is, the vibration exciter 2 operates according to the phase φ and the gain F to apply an excitation force to the vehicle body B, and
The vibration of the vehicle body caused by the engine E is canceled by mutually canceling out the excitation force transmitted by the vibration of the engine E and the excitation force.

Then, after the output to the vibrator 2 in step B5 is finished, a new control process starting from step B1 is executed.

Note that the set rotational speeds N1 and N2 in step B2 mentioned above are set by setting the conditions for operating the vibration exciter, and are usually around the engine rotational speed when the vehicle is idling, for example, N1 = 400 rpm, N2.
2 = set to 1000 rpm.

Further, in step B2, if the engine speed N does not satisfy N2≧N≧N1, steps B6, B7, B8, and B9 are executed so that the vibration exciter 2 is locked by the hold mechanism 11. It's summery.

By the way, the above-mentioned controller 8, phase control section 5, and gain control section 6 may be constituted by hardware mechanisms having the same functions.

The vibration exciter 2 is constructed as shown in FIG.
is erected, and a mass 23 is fitted into the sliding shaft 22, so that the mass 23 can move up and down while its posture is restrained by the sliding shaft 22.

Furthermore, the housing 24 is formed into a cylindrical shape with a bottom.
is disposed to accommodate the mass 23 from above, and the housing 24 has a center portion of a bottom 24a of the housing 24 located above the mass 23 fixed to the upper end of the sliding shaft 22. On the other hand, the lower end 24b of the housing 24 is fixed to the base 21.

Springs 25a and 25b are interposed between the bottom 24a of the housing 24 and the upper end surface of the mass 23, and between the upper end surface of the base 21 and the lower end surface of the mass 23, so as to float the mass 23 from the base 21. The mass 23 is supported at a fixed position in a state where the mass 23 can move up and down without any trouble.

Further, a cylindrical space 23a is formed coaxially with the mass 23 at an intermediate portion in the radial direction.

The cylindrical space 23a is open at the lower end surface of the mass 23, and a cylindrical drive coil 26 erected on the base 21 is disposed within the cylindrical space 23a.

Further, a cylindrical permanent magnet 27 is disposed in the cylindrical space 23a on the outer side facing the drive coil 26, and the permanent magnet 27 is fixed to the mass 23 and forms a part of the mass 23. are doing.

The drive coil 26 is connected to the output end of the amplifier 7 via a connection cord 28, and current flows through the drive coil 26 according to the output of the amplifier 7, and is driven by interaction with the magnetic field generated by the permanent magnet 27. The coil 26 and the mass 23 are configured to be displaced relative to each other.

The hold mechanism 11 of the vibrator 2 is attached to the outer lower part of the housing 24.

The hold mechanism 11 includes a lock pin 29, a drive mechanism 29a for the lock pin 29, and a lock pin engagement hole 23b formed in the mass 23.

The lock pin 29 has a tapered tip, and when the mass 23 moves and the axis of the lock pin 29 and the axis of the lock pin engagement hole 23b do not match, the lock pin 29 is horizontally driven to close the mass. 23 is moved up and down to automatically align the axis of the lock pin 29 and the axis of the lock pin engaging hole 23b.

The drive mechanism 29a for the lock pin 29 is composed of a solenoid valve, etc., and the solenoid is connected to the controller 8. The drive mechanism 29a is driven by a signal from the controller 8 to horizontally drive the lock pin 29, and the mass 23 is The vertical movement is stopped as appropriate.

The vibrator 2 is formed into the shape shown in FIGS. 8 to 15 depending on the mounting position and other conditions.

Namely, the hat type shown in FIG. 8, the square type shown in FIG. 9, the cylindrical type shown in FIG. 10, the cylindrical type shown in FIG. It is formed to have a push-pull cylindrical shape as shown in FIG. 13, a skewer shape as shown in FIG. 14, and a rod shape as shown in FIG. 15, each having the structure of the vibration exciter 2 as shown in FIG. It's becoming like that.

In addition, in the vibrator 2 shown in FIG. 12, the vibrator 2
An additional mass 23c connected to the inner mass 23 is disposed above the outside of the vibrator 2, and by driving the mass 23 and the additional mass 23c together, the mass capacity of the vibrator 2 is increased. I'm starting to let them do it.

By the way, the vibrator 2 can also be configured as shown in FIG. That is, the vibrator 2A as a modified example includes a mass 30, a cam 31 disposed below the mass 30 and attached so that its outline touches the lower surface of the mass 30, and a cam 31 that covers the mass 30 from above. It consists of a housing 32 and a spring 33 interposed between the bottom 32a of the housing 32 and the top surface of the mass 30.

The cam 31 is connected to a motor (not shown) that is connected to the amplifier 7 via a gear or the like (not shown) as a transmission, so that the cam 31 rotates according to the output of the amplifier 7. It's summery.

The mass 30 is moved up and down by the lift caused by the rotation of the cam 31 and the urging force of the spring 33, so that the vehicle body B can be vibrated.

Furthermore, the vibrator 2 can also be configured as shown in FIG.

That is, the vibration exciter 2B as a modified example includes a pair of disk-shaped unbalanced masses 34, 34, to which the masses 34a, 34a are partially attached, and is formed so as to deviate the center of gravity from the center; It is comprised of gears 35, 35 that drive the balance masses 34, 34, and a motor 36 that drives the gears 35, 35.

The motor 36 is controlled by the amplifier 7 to rotate, and this rotation is caused by the gears 35 and 3.
5 to the unbalanced masses 34, 34.

By rotating the unbalanced mass 34,
The mass 34a rotates so that the vehicle body B can be vibrated.

By the way, the gears 35, 35 are arranged between the unbalanced masses 34, 34, and the unbalanced masses 34, 34, as shown by the arrows in FIG.
They are designed to rotate in opposite directions.

Thereby, the excitation force in the horizontal direction due to the rotation of the unbalanced masses 34, 34 is canceled out, and only the excitation force in the vertical direction effectively acts on the vehicle body B.

Furthermore, the vibrator 2 can also be configured as shown in FIG.

That is, the vibrator 2C as a modified example includes a pair of disc-shaped unbalanced masses 37, 37, to which the masses 37a, 37a are partially attached, and is formed so as to deviate the center of gravity from the center; A pair of motors 38, 3 that drive the balance masses 37, 37
8.

The motors 38, 38 are controlled by the amplifier 7 to rotate synchronously, and this rotation causes the unbalanced masses 37, 37 to move toward the amplifier 7.
It is designed to rotate in accordance with the SIN wave e as the output signal.

The motors 38, 38 are designed to rotate in opposite directions as shown by the arrows in FIG.
The excitation force in the horizontal direction due to the rotation of the unbalanced masses 37, 37 is canceled out, and only the excitation force in the vertical direction is effectively applied to the vehicle body B.

Moreover, the vibrator 2 can also be configured as shown in FIGS. 16 and 17.

That is, the vibrator 2D as a modified example includes a frame 39 fixed to the vehicle body B and a frame 39 fixed to the frame 39.
It is composed of an AC motor 40.

The AC motor 40 is connected to the amplifier 7,
The output wave of the amplifier 7 is converted into direct current and inputted. As a result, the AC motor 40
performs intermittent rotation, and this rotation causes an acceleration change at the same frequency as the output frequency of amplifier 7.
It is designed to be generated as a reaction force against the rotation of the AC motor 40.

This reaction force is transmitted to the vehicle body B via the frame 39,
Vehicle body B is designed to be vibrated.

The vibrator 2 can also be configured as shown in FIG. 19.

That is, the vibrator 2E as a modified example includes a vehicle battery 41 that acts as a mass, a fixed frame 42 for the battery 41, a support 43 that supports the fixed frame 42, and a base 44 on which the support 43 is erected. , so that the base 44 is elastically supported by the vehicle body B.
The flexible member 45 made of rubber or the like is interposed between the support 43 and the base 44, and the drive coil 46 is wound around the support 43.

The drive coil 46 is connected to the amplifier 7,
A current corresponding to the output waveform of the amplifier 7 flows through the coil 46.

The support column 43 is made of a permanent magnet, and the battery 41, the fixed frame 42,
The strut 43 and the base 44 are driven up and down, and the battery 41 acts as a mass of the vibration exciter 2 to apply an excitation force to the vehicle body B according to the output waveform of the amplifier 7.

Note that the above-mentioned vertical drive is allowed by the flexible member 45.

The above-mentioned vibrator 2, 2A, 2B, 2C, 2D, 2
E is equipped with a waterproof structure as shown in FIG.

That is, as shown in FIG. 20, the vibrator 2 is covered with a waterproof boot 47 made of rubber, resin, etc., and the lower end of the waterproof boot 47 is connected to the base 2.
1, and a sealant is applied thereon to maintain the waterproofness of the vibrator 2.

Further, the waterproof structure may be configured as shown in FIG. base 21
It is designed to be attached to and waterproof.

Furthermore, the waterproof structure may be constructed as shown in FIG. Installed in a liquid-tight manner.

There is oil 5 inside the waterproof boots 47.
0 is filled, making it possible to effectively perform waterproofing.

Moreover, the waterproof structure shown in FIGS. 20 to 22 described above makes it possible to prevent dust from entering the vibrator 2 and to make the vibrator 2 soundproof.

The vibrator 2 configured as described above includes the 23rd,
It is attached to the vehicle body B as shown in Figure 24.

That is, a hole 1b for attaching a vibration exciter is formed on the lower surface of a cross member 1a (see FIG. 1) attached to the tip of the body frame of the vehicle body B.
A vibrator 2 is inserted into the cross member 1a through this hole 1b.

The vibrator 2 is fixed to the cross member 1a by having its base 21 fixed to the cross member 1a with bolts.

Further, as shown in FIG. 25, the vibration exciter 2 has a base 21 attached to the lower surface of the cross member 1a.
may be attached to the cross member 1a in a suspended state.

In addition, when installing in this way, the 11th
The vibrator 2 shown in the figure may be attached so that the screw 51 fixed to the mass inside thereof is screwed into the lower surface of the cross member 1a, so that the housing 24 is movable.

Furthermore, as shown in FIG. 26, the vibration exciter 2 has a shelf 1c having an L-shaped cross section attached to the side frame 1d of the vehicle body B, and the base 2 of the vibration exciter 2 is attached to the shelf 1c.
1 may be fixed and attached with bolts.

Then, as shown in FIG. 27, the vibration exciter 2
The base 21 of the vibrator 2 may be fixedly attached to the upper surface of the cross member 1a with bolts.

Further, as shown in FIGS. 28 and 29, the vibration exciter 2 may be attached so that the mass 23 is accommodated within the cross member 1a.

That is, in this case, the mass 23 of the vibrator 2
is arranged within the cross member 1a, and
The sliding shaft 22 is inserted from the upper surface to the lower surface of the cross member 1a, and the base 21 is inserted into the cross member 1a.
It is fixed to the top surface of the board with bolts. Square 23 in cross member 1a and cross member 1a
Springs 25a and 25b are interposed between the upper surface member and the lower surface member, and the tip of the sliding shaft 22 is fixed to the lower surface member of the cross member 1a with a nut.

The vibration exciter 2 is mounted at the center of the vehicle body B in the vehicle width direction, as shown in FIG.

Further, the vibration exciter 2 may be mounted on both sides in the vehicle width direction, as shown in FIG. 31.

The vibrator 2 is the third vibrator in the vehicle length direction.
It is attached to the front part of the vehicle body B as shown in Figure 2.

Note that the vibration exciter 2 may be attached to the front and rear parts of the vehicle body B as shown in FIG. 33, or to the front and central part in the longitudinal direction of the vehicle body B as shown in FIG.

In this case, the vibration exciter 2 disposed at the rear or central portion of the vehicle body B is configured to be driven in an opposite phase to the vibration exciter 2 disposed at the front.

Since the vehicle body vibration reduction device of the present invention is configured as described above, an excitation force due to torque fluctuations of the engine E acts on the vehicle body B when the vehicle is idling.

In this case, the vehicle body vibration reduction device configured as shown in FIGS. 2 and 3 is activated.

That is, based on the detection signals of the vehicle speed sensor 9 and the engine speed sensor 10 that are input to the controller 8, steps B1 and B2 shown in FIG.
is executed and the vehicle speed V is below the set vehicle speed _V0 and the engine speed N is within a certain range (N2≧N≧N
It is determined whether the condition 1) is met, and if the condition is met, step B3 is executed and a map corresponding to the vehicle speed V and the engine rotational speed N is selected.

Next, in step B4, the phase φ and gain F to be adjusted are determined based on the map, and the phase control section 5 and gain control section 6
is transmitted to.

On the other hand, the ignition pulse a generated in the engine E is input to the waveform shaping section 3, noise is removed, and the ignition pulse a is shaped into a rectangular wave b having the same timing as the ignition pulse a.

The rectangular wave b is converted by the SIN wave generator 4 into a SIN wave c having the same period as the rectangular wave b.

This SIN wave c is adjusted by the phase φ and gain F determined by the controller 8 described above.

That is, in the phase control unit 5, the phase of the SIN wave c is shifted by φ, and the SIN wave d is changed to the SIN wave d shown by the chain line in FIG.
become.

Further, the amplitude of the SIN wave d is adjusted in the gain control section 6 to match the gain F, and a SIN wave e is obtained.

This SIN wave e is input to the amplifier 7, and the vibration exciter 2
The signal is amplified so as to be suitable for operating the vibration exciter 2, and is output to the vibration exciter 2.

By the way, the audio signal for the car stereo 54 and the SIN wave e are simultaneously input to the amplifier 7, and are amplified as a composite signal.

The amplified composite signal is again divided by the separator 52 into a SIN wave e as an excitation signal and an audio signal.

That is, the low frequency part of the composite signal (e.g. 40Hz
(below) passes through the low-pass filter 52a and is input to the vibrator 2.

Further, the high frequency portion (for example, 40 Hz or higher) of the composite signal passes through the high pass filter 52b and is input to the car stereo speaker 53.

The vibration exciter 2 is driven by the input signal that has passed through the low-pass filter 52a, and applies an excitation force to the vehicle body B.

Incidentally, an excitation force due to torque fluctuations of the engine E acts on the vehicle body B, and the vehicle body B tends to vibrate.

In particular, the vehicle body B has a resonance point close to the _C2 component of the vibration of the engine E, and attempts to generate large vibrations near this resonance point.

However, on the vehicle body B, the excitation force from the engine E and the excitation force whose phase is shifted by φ in the phase control unit 5 and are adjusted so as to always be in the opposite direction to the excitation force from the engine E act on the vehicle body B. As a result, the vibration of the vehicle body B is reduced because the excitation forces are canceled out.

In other words, since the vibration exciter 2 and the engine E are installed at different locations, the transmission paths of the excitation force are different, and the timing at which the excitation force reaches the vehicle body B is different. When an excitation force with the opposite phase to the tension pulse a is generated,
The excitation forces reaching the vehicle body B are not in opposite phase to each other.

Therefore, the excitation force generated by the vibrator 2 is adjusted so that the excitation forces reaching the vehicle body B from the engine E and the vibrator 2 are in opposite phases to each other, thereby reducing the vibration of the vehicle body B. Let it happen.

Then, the gain control section 6 adjusts the amplitude of the excitation force by the engine E and the amplitude of the excitation force by the vibrator 2 to be the same, thereby preventing vibration of the vehicle body B.

By operating the vibrator 2 in this way,
As shown in FIG. 35, vibrations of the vehicle body B are reduced.

FIG. 35 shows the engine rotation speed N on the horizontal axis,
The vertical axis shows the gain G of the excitation force measured by the acceleration sensor, and when the exciter 2 is not operated, the vehicle body B will maintain the engine speed as shown by the solid line x in the figure. It has vibration characteristics with a resonance point around approximately 750Hz.

When this vibration activates the vibrator 2, the vehicle body B comes to have vibration characteristics as shown by the broken line y, and the vibration of the vehicle body B is reduced.

On the other hand, if the controller 8 determines that the vehicle speed V or the engine speed N does not meet the conditions for operating the vibration exciter 2, as shown in FIG. If the vibration is released, the amplifier 7 is turned off in step B6, and then in step B7 it is determined whether the operation of the vibrator 2 is locked by the hold mechanism 11.

If not locked, hold mechanism 11
is activated and the operation of the vibrator 2 is locked, and if it is locked, the locked state is maintained.

By the way, the vibration exciter 2 is operated as follows. That is, the output of the amplifier 7 is input to the drive coil 26, and a current according to the input flows through the drive coil 26.

This current and the magnetic field of the permanent magnet 27 forming a part of the mass 23 act on a driving force in the vertical direction, and the mass 23 vibrates vertically while resisting the biasing force of the springs 25a and 25b.

This vibration causes the vehicle body B to move relative to the base 21.
, and an excitation force acts on the vehicle body B.

When the controller 8 outputs a signal to lock the operation of the vibrator 2, the solenoid valve in the hold mechanism 11 is activated.
The lock pin 29 is driven toward the mass 23, and the lock pin 29 is fitted into the pin engagement hole 23b, thereby restraining the vertical movement of the mass 23 and locking the operation of the vibrator 2.

Vibrator 2 shown in Figures 5-7 and 16-19
Also in A, 2B, 2C, 2D, and 2E, the vibration operation according to the output of the amplifier 7 is performed in the same manner as described above.

In addition, according to the vibration exciter 2D shown in FIGS. 16 and 17, vibration characteristics as shown in FIG. 18 can be obtained.

In Fig. 18, the horizontal axis shows the excitation frequency and the vertical axis shows the gain of the excitation force.In contrast to the general type vibration characteristics shown by the broken line l, the solid line m when using the vibration exciter 2D It is now possible to obtain the excitation characteristic shown by , and a constant gain characteristic can be obtained over a wide frequency range.

And the vibration exciters 2, 2A, 2B, 2C, 2D,
2E has a waterproof structure shown in FIGS. 20 to 22, and the vibrator 2 is waterproof and can operate stably for a long period of time.

Moreover, the waterproof structure prevents the intrusion of dust and also has a soundproofing effect, so that stable operation of the vibrator 2 is maintained and no noise is emitted.

The vibrator 2 is attached as shown in FIGS. 23 to 29, and the excitation force by the vibrator 2 is applied to the vehicle body B via the cross member 1a.

According to the mounting method shown in FIG. 28, the movable part of the vibrator 2 is built into the cross member 1a, so no special installation space is required for the vibrator 2, and the structure is dustproof and waterproof. As it becomes unnecessary,
Installation work will also be easier.

Then, the vibration exciter 2 is attached as shown in FIGS. 30 to 34, and the vehicle body B is vibrated.

In addition, if two or more vibration exciters 2 are installed on both sides of the vehicle as shown in FIG. 31, the vibration action can be reliably performed while maintaining a balance between the left and right sides.

Furthermore, as shown in Figs. 33 and 34, if two or more vibration exciters 2 are installed spaced apart in the vehicle length direction, the vibration action can be performed reliably, and the The opposite phase to the vibration force generated by the engine E is reliably maintained, and the effect of reducing vehicle body vibration is enhanced.

Next, a description will be given of a second embodiment of the vehicle body vibration reduction device of the present invention. It is configured as shown in FIGS. 36 and 37, and in addition to the configuration of the first embodiment,
An acceleration sensor 13 that detects vibrations of the vehicle body B is equipped.

The acceleration G as the vibration of the vehicle body B detected by the acceleration sensor 13 is input to the controller 8 composed of a microcomputer M, and the phase control section 5 and gain control section 6 composed of the microcomputer M are controlled according to the acceleration G. A signal is output.

That is, the control by the controller 8
This is carried out as shown in FIG. 7, and in steps C1 and C2, the vehicle speed V and engine rotational speed N are determined, and it is determined whether or not to operate the vibrator 2.

If the conditions for operating the vibrator 2 are met (V ₀ ≧V and N1≦N≦N2), step C
3, a map corresponding to the vehicle speed V and the engine speed N is selected, and in step C4, the phase φ ₁ , gain F ₁ and n=1 are determined as initial values for control in the phase control section 5 and gain control section 6. Ru.

Then, the phase φ ₁ and the gain F ₁ are output to the phase control section 5 and the gain control section 6.

On the other hand, the ignition pulse a of the engine E is input to the phase control section 5 after being converted into a SIN wave c by the waveform shaping section 3 and the SIN wave generation section 4.

The SIN wave c is passed through step C in the phase control section 5.
6, the adjusted SIN wave d′ is adjusted to shift the phase by φ [=φ ₁ +Δφ (Δφ is a preset phase increment)], and the adjusted SIN wave d′ is adjusted to a gain F ₁ in the gain control section 6. , activates the vibrator 2 via the amplifier 7.

Note that, as in the first embodiment, the audio signal and the excitation signal are input together to the amplifier 7 and amplified, and are then divided by the separator 52 and sent to the vibrator. 2 is activated by an amplified excitation signal.

As a result, when the vibration of the vehicle body B decreases, the acceleration G detected by the acceleration sensor 13 decreases, and this decrease is fed back to the controller 8. In step C7, it is determined that the acceleration G has decreased, and steps C8 and C9 are executed. executed.

In step C8, n is 2 (=1+1)
and φ (=φ ₁ +Δφ) is replaced with φ ₂ .

In step C9, the adjustment phase φ is φ ₂ +Δφ
In the phase control section 5, the SIN wave d' is further adjusted by Δφ and is input to the vibrator 2 via the amplifier 7 with a gain _F1 .

In this way, the process of operating the vibrator 2 by increasing the adjustment phase φ by Δφ is performed by the acceleration sensor 13.
This is repeated until the detected acceleration G passes through the minimum value and increases.

After passing the minimum value, the NO route is taken at step C10, and step C11 is started.
is executed, the adjustment phase φ is decreased by Δφ, and the adjustment phase φ is determined to be the phase immediately before the minimum value, φ=φ _o+1 −Δφ.

On the other hand, if it is determined in step C7 that the detected acceleration G has increased, the process proceeds to step C12.
, the adjustment phase φ is decreased by Δφ, and the vibration exciter 2
Activate.

Then, in step C13, if it is determined that the detected acceleration G has decreased, the adjustment phase φ
The process of operating the vibrator 2 by decreasing Δφ by Δφ is repeated, and in steps C14 to C17, the phase φ is adjusted so that the detected acceleration G is minimized, and the phase immediately before the minimum value is φ=φ _o The adjustment phase φ is determined to ₊₁ +Δφ.

If it is determined in steps C7 and C13 that the detected acceleration G does not change, step C18 is executed and the adjustment phase φ=φ ₁ +Δφ is determined.

While maintaining the adjustment phase φ determined in this manner, the amplitude of the excitation force of the vibrator 2 is adjusted in the gain control section 6.

First, in step C19, the gain F is
Adjust to F ₁ +ΔF, set n to the initial value 1,
The vibration exciter 2 is activated, and it is determined in step C20 whether the detected acceleration G has decreased.

If it is determined in step C20 that the acceleration has decreased, steps C21, C22, and C23 are repeatedly executed, and the gain F is increased by ΔF until the detected acceleration G passes the gain F that is the minimum, and the vibration exciter 2 is increased. Activation is performed.

When the detected acceleration G passes through the minimum gain F, the gain of the vibrator 2 is determined to be the gain F (=F _{o +1} −ΔF) immediately before the minimum gain.

Further, in step C20, the detected acceleration G
If it is determined that the number has increased, step C25
At this point, the gain F is decreased by ΔF and the vibrator 2 is operated.

Then, in step C26, if it is determined that the detected acceleration G has decreased, step C26 is determined.
27, C28, and C29 are repeatedly executed until the detected acceleration G passes the gain F that becomes the minimum.
The vibrator 2 is operated by decreasing the gain F by ΔF.

When the detected acceleration G passes through the minimum gain F, the gain of the vibrator 2 is determined to be the gain F (=F _{o +1} +ΔF) immediately before the minimum gain.

If it is determined in steps C20 and C26 that the detected acceleration G does not increase or decrease, step C31 is executed and the gain F is determined to be _F1 .

After the adjustment phase φ and gain F are determined, the process from step C1 is executed again, and the adjustment phase φ and gain F are adjusted to keep the detected acceleration G of the acceleration sensor 13 at a minimum while excitation is performed. Machine 2 is now operational.

Note that the controller 8, phase control section 5, and gain control section 6 described above may be configured by hardware mechanisms having the same functions.

The vibrator 2 and the hold mechanism 11 are constructed in the same manner as in the first embodiment.

Since the vehicle body vibration reduction device according to the second embodiment of the present invention is constructed as described above, an excitation force due to torque fluctuations of the engine E acts on the vehicle body B when the vehicle is idling.

In this case, the vehicle body vibration reduction device configured as shown in FIGS. 36 and 37 is activated.

That is, based on the detection signals of the vehicle speed sensor 9 and the engine speed sensor 10 that are input to the controller 8, steps C1 and C shown in FIG.
2 is executed and the vehicle speed V is less than the set vehicle speed V ₀ and the engine speed N is within a certain range (V ₀ , N1, and N2 are idling states where there is no vehicle speed and only the engine E is rotating) ) is determined to match the
If the conditions are met, step C3 is executed, and a map corresponding to the vehicle speed V and engine speed N is selected.

Next, in step C4, initial values φ ₁ and F ₁ of the adjustment phase φ and gain F are determined by the map and transmitted to the phase control section 5 and gain control section 6.

Then, the SIN wave e as an excitation signal corresponding to the adjustment phase φ ₁ and gain F ₁ is input to the vibrator 2 in the same manner as in the first embodiment, and the vibrator 2 is operated.

As a result, the vibration of the vehicle body B is reduced in accordance with the adjustment phase φ ₁ and the gain F ₁ in the same manner as in the first embodiment.

Next, step C6 and subsequent steps are executed, and the vehicle body B
The adjustment phase φ ₁ and the gain F ₁ are increased or decreased while feeding back the detected acceleration G of the acceleration sensor 13 that indicates the vibration, and the adjustment phase φ and the gain F are determined so as to minimize the vibration of the vehicle body B.

After the gain F is determined and the vibrator 2 is activated, the process from step C1 is repeated, and the vibrator is 2 is driven, and vibrations of the vehicle body B are constantly reduced.

As described in detail above, according to the vehicle body vibration reduction device of the present invention, in order to reduce vibrations of the vehicle body in a vehicle equipped with an audio amplifier for a car stereo, vibrations are applied to offset the vibrations of the vehicle body. and a signal source for supplying an excitation signal to the vibrator, and in order to cause the vibrator to generate an excitation force having an opposite phase to the vibration of the vehicle body, the signal source and the vibrator are provided. In between, a phase control means for controlling the phase of the excitation signal and the audio amplifier are interposed, and a separator is provided for dividing the output of the audio amplifier into the excitation signal of the vibrator and the audio signal. With a simple configuration that is interposed between the audio amplifier and the vibrator,
This has the advantage of efficiently reducing vehicle body vibration.

Furthermore, the amplifier for the vibrator and the amplifier for the car stereo can be used together, which has the advantage of reducing manufacturing costs.

[Brief explanation of drawings]

Figures 1 to 35 show a vehicle body vibration reduction device as a first embodiment of the present invention. Figure 1 is a vertical cross-sectional view of a vehicle schematically showing its installed state, and Figure 2 shows its overall configuration. 3 is a flowchart showing the control process, FIG. 4 is a longitudinal sectional view showing the vibrator with a hold mechanism, and 5th to 7th fig.
The figures are schematic diagrams showing modified examples of the vibrator.
Figures 8 to 15 are all schematic diagrams showing modified examples of the shape of the vibration exciter, Figures 16 and 17 are schematic diagrams showing other modified examples of the vibration exciter, and Figure 18 is a schematic diagram showing other modified examples of the vibration exciter. Figures 16 and 17 are graphs showing the characteristics of the vibration exciter, Figure 19 is a schematic diagram showing the vibration exciter using a battery, and Figures 20 to 22 are all schematic diagrams showing the waterproof structure of the vibration exciter. Figures 23 to 29 are schematic diagrams showing how the vibrator is installed, and Figures 30
Figures 34 to 34 are schematic diagrams showing the mounting position of the vibration exciter, Figure 35 is a graph showing its characteristics, and Figures 36 and 37 show a car body vibration reduction device as a second embodiment of the present invention. FIG. 36 is a block diagram thereof, and FIG. 37 is a flowchart showing its control process. 1... Body frame, 1a... Cross member, 1b... Hole, 1c... Shelf, 1d... Side frame, 2, 2A, 2B, 2C, 2D, 2E...
Vibrator, 3...Waveform shaping section, 4...SIN wave generation section, 5...Phase control section, 6...Gain control section, 7...Amplifier, 8...Controller, 9...
...Vehicle speed sensor, 10...Engine speed sensor,
11...Hold mechanism, 12...Vehicle speed control section, 13...Acceleration sensor, 21...Base,
22...Sliding shaft, 23...Mass, 23a...Cylindrical space, 23b...Lock pin engagement hole, 23c
...Additional mass, 24...Housing, 24a...
Bottom of housing, 24b... Lower end of housing, 25a, 25b... Spring, 26... Drive coil, 27... Permanent magnet, 28... Connection cord, 29... Lock pin, 29a... Lock pin drive mechanism, 30 ...Mass, 31...Cam, 32
...housing, 32a...bottom of housing,
33... Spring, 34... Unbalanced mass, 34a... Mass, 35... Gear, 36... Motor, 37... Unbalanced mass, 37a... Mass, 38... Motor, 39... Frame, 40 ...Motor, 41...Battery, 42...Fixed frame, 43...
...Strut, 44...Base, 45...Flexible member, 4
6... Drive coil, 47... Waterproof boots, 48
...Rubber padskin, 49...Jiyabara, 50...
Oil, 51...screw, 52...separator, 5
2a...Low pass filter, 52b...High pass filter, 53...Car stereo speaker, 5
4... Car stereo, B... Vehicle body, E... Engine, M... Microcomputer, a... Ignition pulse, b... Square wave, c, d, d', e... SIN wave.

Claims (1)

[Scope of utility model registration request] In a vehicle equipped with an audio amplifier for a car stereo, in order to reduce the vibration of the vehicle body, a vibration exciter for canceling out the vibration of the vehicle body and a signal source that supplies an excitation signal to the vibration exciter are installed. Prepare,
In order to cause the vibration exciter to generate an excitation force having an opposite phase to the vibration of the vehicle body, a phase control means for controlling the phase of the excitation signal is provided between the signal source and the vibration exciter, and the audio amplifier and a separator for dividing the output of the audio amplifier into an excitation signal of the vibrator and an audio signal is interposed between the audio amplifier and the vibrator. Vehicle body vibration reduction device.