JPH05682A - Rigidity variable car body - Google Patents

Abstract

PURPOSE:To contribute to the ensuring of a satisfactory riding feeling without improving the rigidity of a vehicle when the satisfactory riding feeling of the vehicle under the travelling condition is prior to others and further provide an input vibration frequency from the road surface which is a frequency equal or approximate to a resonance frequency and set to the resonance condition or one approximate thereto to prevent the occurrence of uncomfortable vibrations having relatively large amplitude. CONSTITUTION:There are provided mechanisms 30-37 for adjusting the rigidity of a door part, engine hood part and rear gate part to change the bending rigidity and torsional rigidity of a car body 11 accompanied by left and right doors, engine hood and rear gates 3, 4, 7 and 9, a vibration sensor 55 for detecting the input vibration frequency from the road surface to a car body part 11 and a circuit composing part 57 for set the adjusting mechanisms 30, 37 to conditions of improving the bending rigidity and torsional rigidity of the car body part 11 when the input vibration frequency obtained on the basis of the output of vibration sensor 55 is less than a predetermined value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a vehicle body main body having an opening and a movable portion for opening and closing the opening, the bending rigidity and the torsional rigidity of which are changed according to the situation. And a variable rigidity vehicle body.

[0002]

2. Description of the Related Art A vehicle body is provided with a cabin opening, an engine room opening, a trunk space opening and the like, and a cabin opening, an engine room opening, a trunk space opening and the like are opened and closed, respectively. It has a basic structure in which a plurality of movable parts such as a door, an engine hood and a trunk lid are attached.
Then, various reinforcing members are attached to the body main body portion and each movable portion at the portions where they are required, thereby ensuring the rigidity of the entire vehicle body.

In such a vehicle body, for example, as disclosed in Japanese Utility Model Laid-Open No. 59-137869, a pressure is applied to a center pillar which partially forms a cabin opening in the vehicle body. An end face portion of the door that opens and closes the cabin opening is provided with a pin so that the tip of the pin protrudes outward from the end face portion of the center pillar that faces the cabin opening, and the push pin of the center pillar protrudes. On the end face portion that is made to oppose to each other, the receiving portion is provided at a position corresponding to the tip end portion of the pressing pin, and when the vehicle is in a traveling state, the pressing pin is made to protrude from the end surface portion facing the cabin opening of the center pillar. And its tip is pressed against a saucer provided on the door that is closed to close the cabin opening. It is intended to be crimped, whereby, during running of the vehicle, as the rigidity of the car body part which entailed the door is thus enhanced further have been proposed. The rigidity of the vehicle body of such a vehicle is improved when the vehicle is running as compared with when the vehicle is stopped, and the movement characteristics are improved or the noise is reduced while the vehicle is in a predetermined running state. To be able to.

[0004]

However, under such a running condition, a vehicle equipped with a vehicle body whose rigidity is constantly increased is, for example, a small chord caused by unevenness of the road surface. Such a shock is directly transmitted to the occupant, which often causes the occupant to feel uncomfortable. That is, while the vehicle is traveling, it is desirable that the vehicle body has high rigidity so that the driver can obtain a sharp steering feeling, a good braking operation feeling, a good road surface feeling, etc. when turning or braking. There are two states: when the vehicle is running on a flat straight road, and when the rigidity of the vehicle body is high, the passenger comfort is prioritized. When it is placed, it is assumed that the rigidity of the vehicle body is always increased, and even when it is prioritized that the ride comfort of passengers is improved rather than the rigidity of the vehicle body is increased, the rigidity of the vehicle body is It remains high, resulting in a loss of ride comfort for the occupant.

Further, the vehicle body of a vehicle is generally accompanied by a mechanical resonance vibration frequency (hereinafter, simply referred to as resonance frequency) according to its overall rigidity, and the resonance frequency is higher as the rigidity of the vehicle body is higher. Frequency. Therefore, as described above, in a vehicle equipped with a vehicle body whose rigidity is constantly increased under running conditions, the resonance frequency of the vehicle body during traveling is substantially fixed to a relatively high frequency. As a result, the vibration caused by the unevenness of the road surface etc. is transmitted through the wheels to the vehicle body which has a resonance frequency substantially fixed to a relatively high frequency when traveling. It In the case of a vehicle body that is accompanied by a resonance frequency substantially fixed to a relatively high frequency when the vehicle is traveling, for example, when the vehicle is traveling at a relatively low vehicle speed and is transmitted to the vehicle body. When the frequency caused by vibration due to unevenness of the road surface, that is, the input vibration frequency from the road surface to the vehicle body is a relatively low frequency, the input vibration frequency is substantially fixed at a relatively high frequency. Since it is separated from the resonance frequency of the vehicle, vibration due to unevenness of the road surface transmitted to the vehicle body is suppressed, but, for example, when the vehicle is running at a relatively high vehicle speed, When the input vibration frequency from the road surface to the vehicle is relatively high and is equal to or near the resonance frequency of the vehicle body, the vehicle is in the resonance state or It is placed in a close state, thus invited the disadvantage that the situation caused an unpleasant vibration that has a relatively large amplitude.

In view of such a point, the present invention provides a vehicle with a high rigidity to the occupant when the vehicle is placed in a traveling state in which priority is given to the comfort of the occupant rather than the high rigidity of the vehicle body. It is said that it contributes to ensuring a good ride comfort of the vehicle, and that the input vibration frequency from the road surface becomes a frequency equal to or near the resonance frequency in the resonance state or a state close to it, which is relatively large. An object of the present invention is to provide a variable rigidity vehicle body that can avoid a situation in which an unpleasant vibration having an amplitude is generated.

[0007]

In order to achieve the above object, a variable rigidity vehicle body according to the present invention is provided with an opening portion and a vehicle body portion having a movable portion attached to open and close the opening portion. The rigidity adjusting means for changing the bending rigidity and the torsional rigidity of the vehicle body, the detecting means for detecting the input vibration frequency from the road surface with respect to the vehicle body portion, and the operation controlling means for the rigidity adjusting means are provided. When the detected input vibration frequency is equal to or lower than a predetermined value, the rigidity adjusting means is configured to increase the bending rigidity and the torsional rigidity of the vehicle body part including the movable part.

[0008]

In the variable rigidity vehicle body according to the present invention configured as described above, the input vibration frequency from the road surface with respect to the vehicle body is detected, and the detected input vibration frequency is, for example, When the rigidity adjusting means is equal to or lower than a predetermined value selected as a frequency slightly higher than the resonance frequency under the condition that the bending rigidity and the torsional rigidity of the vehicle body part accompanied by the movable part are not increased, the rigidity adjusting means moves. The bending rigidity and the torsional rigidity of the main body part of the vehicle body are improved. As a result, when there is a risk that the input vibration frequency from the road surface with respect to the vehicle body will be a frequency equal to or lower than the resonance frequency or a frequency in the vicinity thereof, As the bending rigidity and the torsional rigidity are increased, the resonance frequency is shifted to the high frequency range side. As a result, the vehicle body including the movable part is placed in a resonance state or a state close to the resonance frequency with the input vibration frequency from the road surface being at or near the resonance frequency, and has a relatively large amplitude. A situation that would cause an unpleasant vibration is avoided.

Further, when the detected input vibration frequency exceeds a predetermined value, the rigidity of the body of the vehicle body including the movable part is not increased, and the rigidity of the vehicle body of the vehicle is high. Under a traveling condition in which good riding comfort is prioritized, it is considered to contribute to ensuring good riding comfort for passengers.

[0010]

1 shows a vehicle equipped with an example of a variable rigidity vehicle body according to the present invention. In the vehicle shown in FIG. 1, a left door 3 for opening and closing a left cabin opening and a right cabin opening, respectively. The vehicle body main body 11 has a right door 4, an engine hood 7 that opens and closes an engine room opening, and a rear gate 9 that opens and closes a trunk space opening. A front bumper is integrally formed on the vehicle body main body 11. Further, a vehicle body including the front shroud 12, the left and right front fenders 13 and 14, the rear bumper 15 and the like is attached is provided. And left door 3
In the right door 4, the end portion on the left front fender 13 side and the end portion on the right front fender 14 side are connected to the vehicle body portion 11 via the hinge portion, and in the engine hood 7, the front windshield 18 is connected. An end portion on the lower side of the vehicle body is connected to the vehicle body portion 11 via a hinge portion. Further, in the rear gate 9, the roof 2
The rear end portion of 0 is connected to the vehicle body portion 11 via a hinge portion. Therefore, the left door 3 and the right door 4 open and close the left cabin opening and the right cabin opening, respectively, with their rear end portions 3A and 4A being separated and brought close to the left rear fender 21 and the right rear fender 22, respectively. In the engine hood 7, the front end portion 7A of the engine hood 7 is separated from and close to the front shroud 12 to open and close the engine compartment opening. It is said that the trunk space opening is opened and closed by being separated from and close to.

Under these circumstances, the upper and lower portions of the rear end 3A of the left door 3 and the left rear fender 21 and the rear end 4A of the right door 4 and the right rear fender 22 are opposed to each other. The door portion rigidity adjusting mechanisms 30 and 3 are respectively provided at the upper side portion and the lower side portion of the mutually opposing portions of
1, 32 and 33 are arranged, and the front side portion of the left end portion 7B of the engine hood 7 and the left front fender 13 facing each other and the right side end portion 7C and the right front portion of the engine hood 7 are disposed. Engine hood partial rigidity adjusting mechanisms 34 and 35 are respectively arranged at front side portions of the portion facing the fender 14 and further, the left end portion 9B of the rear gate 9 and the left rear fender 21 are provided.
Rear gate partial rigidity adjusting mechanisms 36 and 37 are respectively arranged in a rear side portion in a portion facing each other and a rear side portion in a portion facing each other between the right end 9C of the rear gate 9 and the right rear fender 22. ..

As shown in FIG. 2, which is a sectional view taken along line II-II of FIG.
It is configured to include an electromagnetic plunger 40 fixed inside the left rear fender 21 and an engaging portion 41 fixed inside the rear end portion 3A of the left door 3. Electromagnetic plunger 40
The movable member 40A is projected from the left rear fender 21 to the outside through a through hole provided in the end face portion 21A of the left rear fender 21. The movable member 40A of the electromagnetic plunger 40 is driven so as to move forward and backward toward the rear end portion 3A of the left door 3 at the end surface portion 21A of the left rear fender 21. It is shaped like a sphere. On the other hand, the engaging portion 41 is provided with a bottomed hole 43 that is connected to a through hole 42 provided in the end face portion 3B of the rear end portion 3A of the left door 3, and the bottomed hole 43 The connecting portion with the through hole 42 forms a taper portion. The through hole 42 has an inner diameter sufficiently larger than the outer diameter of the movable member 40A of the electromagnetic plunger 40.
A portion deeper than the tapered portion in the bottomed hole 43 connected with the tapered portion has an inner diameter which is slightly larger than the outer diameter of the movable member 40A of the electromagnetic plunger 40.

As shown in FIG. 2, when the left door 3 is closed and the end face portion 3B of the rear end portion 3A of the left door 3 is made to face the end face portion 21A of the left rear fender 21, The through hole 42 provided in the end face portion 3B is
It is supposed to be placed at a position facing the tip of the movable member 40A of the electromagnetic plunger 40 protruding outward from the through hole provided in the end surface portion 21A. Then, the through hole 42 provided in the end face portion 3B is provided in the movable member 4 of the electromagnetic plunger 40.
When the movable member 40A of the electromagnetic plunger 40 is set to the retracted position shown by the solid line in FIG.
The movable member 40A of the electromagnetic plunger 40 is not engaged with the engaging portion 41 fixed inside the rear end portion 3A of the left door 3. At this time, the door partial rigidity adjusting mechanism 30 prevents the left door 3 from being restrained with respect to the left rear fender 21 forming the vehicle body body 11 under the condition that the left cabin opening provided in the vehicle body body portion 11 is closed. It is in a state of being released, and in such a situation, the rigidity of the portion of the vehicle body 11 with the left door 3 is not changed.

On the other hand, the electromagnetic plunger 40 is provided with the through hole 42 provided in the end surface portion 3B facing the tip of the movable member 40A of the electromagnetic plunger 40.
When the movable member 40A of FIG. 2 is set to the forward movement position shown by the alternate long and short dash line in FIG. 2, the front end of the movable member 40A passes through the through hole 42 provided in the end face portion 3B, and The movable member 40A reaches a portion deeper than the tapered portion of the bottomed hole 43 provided in the engaging portion 41 fixed inside the end portion 3A, and the movable member 40A enters the bottomed hole 43 provided in the engaging portion 41. It is inserted and brought into a state of being engaged with the engaging portion 41. In such a situation, the door partial rigidity adjusting mechanism 30 causes the left rear fender 21 that forms the vehicle body portion 11 under the condition that the left door 3 closes the left cabin opening provided in the vehicle body portion 11. However, in such a situation, the rigidity of the portion of the vehicle body 11 including the left door 3 is increased.

The movable member 40 of the electromagnetic plunger 40
When A is engaged with the engaging portion 41, the tip of the movable member 40A is shaped into a spherical shape, and
The bottomed hole 43 provided in the engaging portion 41 is the movable member 40A.
By being connected with a tapered portion to the through hole 42 having an inner diameter sufficiently larger than the outer diameter of
The movable member 40A can be easily and smoothly inserted into the bottomed hole 43 provided in the engaging portion 41.

Door part rigidity adjusting mechanisms 31, 32 and 33
Is configured similarly to the above-described door partial rigidity adjusting mechanism 30, and has an electromagnetic plunger and an engaging portion corresponding to the electromagnetic plunger 40 and the engaging portion 41, respectively.
The same operation as that of the door portion rigidity adjusting mechanism 30 is performed, and the same function as that of the door portion rigidity adjusting mechanism 30 is performed.

On the other hand, the engine hood partial rigidity adjusting mechanism 3
4 is provided inside the electromagnetic plunger 45 fixed inside the left front fender 13 and the left end portion 7B of the engine hood 7, as shown in FIG. 3 showing a section taken along the line III-III in FIG. And an engaging portion 47 fixed to the supporting portion 46. Electromagnetic plunger 4
5, the movable member 45A has the left front fender 13
It is supposed that it is made to project from the left front fender 13 into the engine room through the through hole provided in the end face portion 13A. The movable member 45A of the electromagnetic plunger 45 is connected to the end surface portion 13 of the left front fender 13.
In A, the tip end portion of the movable member 45A is driven so as to move back and forth toward the support portion 46 provided inside the left end portion 7B of the engine hood 7, and the tip end portion of the movable member 45A is shaped into a spherical shape. .. On the other hand, the engaging portion 47 is provided with a bottomed hole 49 connected to the through hole 48 provided in the support portion 46, and the connecting portion of the bottomed hole 49 with the through hole 48 is tapered. Forming a part. The through hole 48 has an inner diameter that is sufficiently larger than the outer diameter of the movable member 45A of the electromagnetic plunger 45, and a portion deeper than the tapered portion in the bottomed hole 49 connected to the through hole 48 with a tapered portion. Has an inner diameter that is extremely slightly larger than the outer diameter of the movable member 45A of the electromagnetic plunger 45.

As in the state shown in FIG. 3, the engine hood 7 is closed, and the support portion 46 provided inside the left end portion 7B of the engine hood 7 has an end surface portion 13A of the left front fender 13. When facing each other, the through hole 48 provided in the support portion 46 is placed at a position facing the tip end portion of the movable member 45A of the electromagnetic plunger 45 protruding outward from the through hole provided in the end surface portion 13A. It is said that. Then, the through hole 48 provided in the support portion 46.
When the movable member 45A of the electromagnetic plunger 45 is set in the retracted position shown by the solid line in FIG. 45
The movable member 45A is not engaged with the engaging portion 47 fixed to the support portion 46 provided inside the left end portion 7B of the engine hood 7. At this time, the engine hood partial rigidity adjusting mechanism 34 controls the engine hood 7 with respect to the left front fender 13 forming the vehicle body 11 under the condition that the engine room opening provided in the vehicle body 11 is closed. The vehicle is in a state of being released from the restraint, and in such a situation, the change of the rigidity of the portion of the vehicle body portion 11 accompanied by the engine hood 7 is not brought about.

On the other hand, the through hole 48 provided in the support portion 46 is placed at a position facing the tip of the movable member 45A of the electromagnetic plunger 45, and then the electromagnetic plunger 45 is placed.
When the movable member 45A of FIG. 3 is set to the forward movement position shown by the alternate long and short dash line in FIG. 3, the tip end of the movable member 45A passes through the through hole 48 provided in the support portion 46 to the left side of the engine hood 7. The movable member 45 </ b> A is provided in the engaging portion 47, reaching a portion deeper than the tapered portion of the bottomed hole 49 provided in the engaging portion 47 fixed to the support portion 46 provided inside the end portion 7 </ b> B. It is inserted into the bottomed hole 49 and brought into a state of being engaged with the engaging portion 47. In such a situation, the engine hood partial rigidity adjustment mechanism 3
4 is a state in which the engine hood 7 is restrained with respect to the left front fender 13 forming the vehicle body portion 11 under the state that the engine room opening provided in the vehicle body portion 11 is closed. In such a situation, the rigidity of the portion of the vehicle body 11 including the engine hood 7 is increased.

The movable member 45 of the electromagnetic plunger 45
When A is engaged with the engaging portion 47, the tip of the movable member 45A is shaped into a spherical shape, and
The bottomed hole 49 provided in the engaging portion 47 is the movable member 45A.
By being connected with a tapered portion to the through hole 48 which has an inner diameter sufficiently larger than the outer diameter of
The movable member 45A can be easily and smoothly inserted into the bottomed hole 49 provided in the engaging portion 47.

The engine hood partial rigidity adjusting mechanism 35 and the rear gate partial rigidity adjusting mechanisms 36 and 37 are also configured similarly to the engine hood partial rigidity adjusting mechanism 34 described above, and correspond to the electromagnetic plunger 45 and the engaging portion 47, respectively. It has an electromagnetic plunger and an engaging portion, and performs the same operation as the engine hood partial rigidity adjustment mechanism 34 and performs the same function as the engine hood partial rigidity adjustment mechanism 34.

As described above, the vehicle body 11 has the left door 3,
A suspension device for a vehicle including a vehicle body to which the right door 4, engine hood 7, rear gate 9 and the like are assembled, and further front shroud 12, left and right front fenders 13 and 14, rear bumper 15 and the like are attached. In relation to the vehicle body 11 through the wheels
A vibration sensor 55 is provided for detecting vibrations caused by unevenness of the road surface transmitted to the vehicle. Such a vibration sensor 55
As shown in FIG. 4, the strut member 83 in the suspension device 82 is fixed to the vehicle body 11 and is attached to the vehicle body 11 to support the wheels 81 so as to be vertically movable with respect to the vehicle body 11. Are linked to each other via a link member 84. As a result, the vibration sensor 55 is received by the strut member 83 through the wheel 81, and the vehicle body body 1 via the suspension device 82.
The vibrations due to the unevenness of the road surface, which are transmitted to No. 1, are transmitted to the vibration sensor 5 through the link member 84.
The reference numeral 5 sends a detection output signal representing a vibration caused by unevenness of the road surface transmitted to the vehicle body 11 through the wheels 81, which has a change according to the vibration transmitted through the link member 84.

Further, in the vehicle body 11, for example, inside the dash panel forming the front part of the cabin forming portion, a detection output signal from the vibration sensor 55 is received, and the door partial rigidity adjusting mechanism 30, 31,
32 and 33, engine hood partial rigidity adjusting mechanisms 34 and 35, and rear gate partial rigidity adjusting mechanisms 36 and 37, respectively.
Are arranged. Then, the vibration sensor 55, the circuit configuration portion 57, and the door portion rigidity adjusting mechanism 30, 31, 32.
And 33 and engine hood partial rigidity adjusting mechanisms 34 and 3
5, and the electromagnetic plungers in the rear gate partial rigidity adjusting mechanisms 36 and 37, respectively, are electrically connected, for example, as shown in FIG.

Under the electrical connection shown in FIG. 5, the detection output signal SB from the vibration sensor 55 is supplied to the circuit component 57. The circuit configuration unit 57 includes a control block 65 and a drive circuit 66. The control block 65 controls the control signal C based on the detection output signal SB representing the vibration caused by the unevenness of the road surface transmitted from the vibration sensor 55 to the vehicle body 11 through the wheels 81.
P is formed and supplied to the drive circuit 66. And
When the control signal CP is supplied, the drive circuit 66 forms a drive signal DP according to the control signal CP, and the electromagnetic signal from the electromagnetic plunger 40 and the door part rigidity adjustment mechanisms 31, 32, and 33 in the door part rigidity adjustment mechanism 30 are generated by the drive circuit 66. The engine hood partial rigidity adjustment provided in the electromagnetic plungers 50, 51 and 52 corresponding to the electromagnetic plunger 40 of the door partial rigidity adjusting mechanism 30, the electromagnetic plunger 45 in the engine hood partial rigidity adjusting mechanism 34, and the engine hood partial rigidity adjusting mechanism 35. Supply to the electromagnetic plunger 53 corresponding to the electromagnetic plunger 45 in the mechanism 34, and the electromagnetic plungers 67 and 68 corresponding to the electromagnetic plunger 45 in the engine hood partial rigidity adjusting mechanism 34, which are respectively provided in the rear gate partial rigidity adjusting mechanisms 36 and 37. To do.

When the drive signal DP is not supplied, the electromagnetic plunger 40 in the door partial rigidity adjusting mechanism 30 causes the movable member 40A to take the retracted position, and the door partial rigidity adjusting mechanism 30 causes the left door 3 to move to the body part of the vehicle body. The left cabin opening provided in 11 is closed, and the left rear fender 21 forming the vehicle body 11 is released from the constraint, and the drive signal DP is When supplied, the movable member 40A is moved to the forward position so that the door partial rigidity adjustment mechanism 30 causes the left door 3 to move.
Is closed with respect to the left rear fender 21 forming the vehicle body 11, while the left cabin opening provided in the vehicle body 11 is closed. Similarly, when the drive signal DP is not supplied, the electromagnetic plunger 50 in the door partial rigidity adjusting mechanism 31 causes the movable member to take the retracted position, and the door partial rigidity adjusting mechanism 31 causes the left door 3 to move to the vehicle body main body part. The left cabin opening provided in 11 is closed, and the left rear fender 21 forming the vehicle body 11 is released from the constraint, and the drive signal DP is When supplied, the movable member is moved to the forward position so that the door partial rigidity adjusting mechanism 31 closes the left door 3 to the left cabin opening provided in the vehicle body 11. The left rear fender 21 forming the vehicle body 11 is restrained.

When the drive signal DP is not supplied, each of the electromagnetic plunger 51 in the door partial rigidity adjusting mechanism 32 and the electromagnetic plunger 52 in the door partial rigidity adjusting mechanism 33 causes its movable member to take the retracted position.
The door portion rigidity adjusting mechanism 32 or 33 is used for the right door 4.
Is closed from the right cabin opening provided in the vehicle body 11, and is released from the restraint on the right rear fender 22 forming the vehicle body 11. When the drive signal DP is supplied, the movable member is caused to move to the forward position so that the door partial rigidity adjusting mechanism 32 or 33 closes the right door 4 to the right cabin opening provided in the vehicle body 11. The right rear fender 22 that forms the body 11 of the vehicle body
To be in a state of being bound to.

Further, the engine hood partial rigidity adjusting mechanism 3
The electromagnetic plunger 45 in No. 4 causes the movable member 45A to take the retracted position when the drive signal DP is not supplied,
The engine hood partial rigidity adjusting mechanism 34 releases the engine hood 7 from being restrained with respect to the left front fender 13 forming the vehicle body body 11 under the state of closing the engine room opening provided in the vehicle body body 11. The drive signal DP.
Is supplied to the movable member 45A, the engine hood partial rigidity adjusting mechanism 34 causes the engine hood 7 to close the engine room opening provided in the vehicle body 11. In addition, the left front fender 13 forming the vehicle body 11 is restrained.

When the drive signal DP is not supplied, the electromagnetic plunger 53 in the engine hood partial rigidity adjusting mechanism 35 causes the movable member to take the retracted position,
The engine hood partial rigidity adjusting mechanism 35 releases the engine hood 7 from being restrained with respect to the right front fender 14 forming the vehicle body portion 11 under the condition that the engine room opening provided in the vehicle body portion 11 is closed. The drive signal DP.
When the fuel is supplied, the movable position of the engine hood is adjusted so that the engine hood partial rigidity adjusting mechanism 35 closes the engine hood 7 to the engine room opening provided in the vehicle body 11. In addition, the right front fender 14 forming the vehicle body 11 is restrained.

Further, the rear gate portion rigidity adjusting mechanism 36
When the drive signal DP is not supplied to the electromagnetic plunger 67, the rear gate partial rigidity adjusting mechanism 36 causes the movable member to take the retracted position so that the rear gate 9 opens the trunk space opening portion provided in the vehicle body 11. Under the closed condition, the left rear fender 21 forming the vehicle body 11 is released from the restraint, and when the drive signal DP is supplied, the movable member is moved forward. The rear gate partial rigidity adjusting mechanism 36 moves the rear gate 9 to the vehicle body 1 when the position is set.
The left rear fender 2 that forms the vehicle body 11 under the condition that the trunk space opening provided in the vehicle 1 is closed.
It is made to be in a state of being restrained with respect to 1.

The rear gate part rigidity adjusting mechanism 37
When the drive signal DP is not supplied, the electromagnetic plunger 68 in FIG. 6 causes the movable member to take the retracted position, and the rear gate partial rigidity adjustment mechanism 37 causes the rear gate 9 to open the trunk space opening provided in the vehicle body 11. Under the closed state, the right rear fender 22 forming the vehicle body 11 is released from the constraint, and when the drive signal DP is supplied, the movable member is moved forward. The rear gate partial rigidity adjusting mechanism 37 moves the rear gate 9 to the vehicle body 1 when the position is set.
The right rear fender 2 that forms the vehicle body 11 under the condition that the trunk space opening provided in the vehicle 1 is closed.
It is made to be in a state of being restrained with respect to 2.

Under the above circumstances, the control block 65 in the circuit configuration unit 57 controls the vehicle body 1 through the wheels 81 based on the change in the detection output signal SB from the vibration sensor 55.
Frequency of vibration caused by unevenness of the road surface transmitted to 1,
That is, the input vibration frequency fs from the road surface to the vehicle body 11 is detected, and the input vibration frequency fs is the reference frequency fo.
In the following cases, the control signal CP is sent to the drive circuit 66. When the input vibration frequency fs is detected to be equal to or lower than the reference frequency fo, the control signal CP is sent to the drive circuit 66, for example, for a predetermined period of 10 seconds thereafter, during which a detection output signal is detected. S
Even if B changes, it continues regardless of the change.
Therefore, every time the input vibration frequency fs is detected to be equal to or lower than the reference frequency fo, the drive circuit 6 is operated for 10 seconds thereafter.
The drive signal DP from 6 is applied to the door portion rigidity adjusting mechanism 30,
Electromagnetic plungers 40, 5 at 31, 32 and 33
0, 51 and 52, engine hood partial rigidity adjusting mechanism 3
It is supplied to the electromagnetic plungers 45 and 53 in 4 and 35, and the electromagnetic plungers 67 and 68 in the rear gate partial rigidity adjusting mechanisms 36 and 37, respectively. The control block 65 also controls the input vibration frequency fs.
Is above the reference frequency fo, the drive circuit 66
The control signal CP is not sent to.

At this time, the reference frequency fo is set so that the door partial rigidity adjusting mechanisms 30 to 33 respectively set the left door 3 or the right door 4 and the left door opening or the right door opening provided in the body 11 of the vehicle body. In the closed state, the left rear fender 21 or the right rear fender 22 forming the vehicle body 11 is released from the restraint, and the engine hood partial rigidity adjusting mechanisms 34 and 3 are provided.
The left front fender 13 that forms the vehicle body 11 under the condition that the engine hood 7 closes the engine room opening provided in the vehicle body 11.
Alternatively, a state in which the right front fender 14 is released from the restraint and the rear gate partial rigidity adjusting mechanisms 36 and 37 block the rear gate 9 from the trunk space opening provided in the vehicle body portion 11 respectively. Under the condition that the left rear fender 21 or the right rear fender 22 forming the vehicle body part 11 is released from the restraint, the left door 3, the right door 4, the engine hood 7, the rear gate 9, etc. And the front shroud 12, the left and right front fenders 13 and 14, the rear bumper 15 and the like are attached, that is, the resonance frequency fr of the body main body 11 that is not in a state where the rigidity is increased. Selected to a slightly higher frequency.

The vibration characteristic of the vehicle body 11 which is not in the state of increased rigidity is shown in the characteristic diagram of FIG. 6 in which the horizontal axis represents the vibration frequency and the vertical axis represents the amplitude. The resonance frequency fr is set to about 30H
z. Therefore, the reference frequency fo is selected to be a frequency slightly higher than the resonance frequency fr of about 30 Hz, for example, 35 Hz.

Under the control of the control block 65, when the input vibration frequency fs from the road surface to the vehicle body 11 is equal to or lower than the reference frequency fo selected to be 35 Hz, the control block 65 drives it. The control signal CP is sent to the circuit 66, so that the drive circuit 66 causes the electromagnetic plungers 40, 50, 51 and 5 in the door partial rigidity adjusting mechanisms 30, 31, 32 and 33 to be transmitted.
2, electromagnetic plungers 45 and 53 in the engine hood partial rigidity adjusting mechanisms 34 and 35, and an electromagnetic plunger 6 in the rear gate partial rigidity adjusting mechanisms 36 and 37.
The drive signal DP is supplied to each of 7 and 68, and each of the door partial rigidity adjusting mechanisms 30 and 31 causes the left door 3 to move.
Is restrained with respect to the left rear fender 21 forming the vehicle body 11 under the condition that the left cabin opening provided in the vehicle body 11 is closed, and the rigidity of the door portion is reduced. Each of the adjusting mechanisms 32 and 33 binds the right door 4 to the right rear fender 22 that forms the vehicle body 11 under the condition that the right cabin opening provided in the vehicle body 11 is closed. When the engine hood partial rigidity adjusting mechanisms 34 and 35 block the engine hood 7 from closing the engine room opening provided in the vehicle body 11, It is in a state of being restrained with respect to the left front fender 13 or the right front fender 14 forming the main body portion 11, and further, the rear gate partial rigidity adjusting mechanism 36 and 37 respectively of, the rear gate 9,
Under the state in which the trunk space opening provided in the vehicle body portion 11 is closed, it is in a state of being restrained with respect to the left rear fender 21 or the right rear fender 22 forming the vehicle body portion 11. On the other hand, the vehicle body 11
The input vibration frequency fs from the road surface with respect to
When the reference frequency fo selected at 5 Hz is exceeded,
The control signal CP is not sent from the control block 65 to the drive circuit 66, so that the drive circuit 66 causes the electromagnetic plungers 40, 50, 51 and 52 in the door partial stiffness adjusting mechanisms 30, 31, 32 and 33, and the engine hood partial stiffness. Electromagnetic plungers 45 and 53 in the adjusting mechanisms 34 and 35, and rear gate partial rigidity adjusting mechanisms 36 and 3
The drive signal DP is not supplied to the electromagnetic plungers 67 and 68 in FIG.

As a result, when the input vibration frequency fs from the road surface to the vehicle body 11 is equal to or lower than the reference frequency fo selected at 35 Hz, for example, the vehicle body 1
Part with left door 3 in 1, part with right door 4,
By increasing the rigidity of each of the part with the engine hood 7 and the part with the rear gate 9, and increasing the rigidity of each of the part with the left door 3 and the part with the right door 4, the left door 3, the right Door 4, engine hood 7
The bending rigidity of the vehicle body 11 including the rear gate 9 and the rear gate 9 is effectively increased, and the rigidity of each of the portion including the engine hood 7 and the portion including the rear gate 9 is increased, whereby the left door 3 , The right door 4, the engine hood 7, and the rear gate 9 together with the vehicle body 11 can be effectively increased in torsional rigidity. In this way, the body main body 11 including the left door 3, the right door 4, the engine hood 7, and the rear gate 9 in which the bending rigidity and the torsional rigidity are effectively increased has the vibration characteristic. As shown in the characteristic diagram of FIG. 7 in which the horizontal axis represents the vibration frequency and the vertical axis represents the amplitude, the resonance frequency fr is set to approximately 40 Hz from that shown in FIG. It is supposed to be changed to what That is, the resonance frequency fr is increased from about 30 Hz to about 40 Hz as the bending rigidity and the torsional rigidity are improved. Therefore, in such a case, the input vibration frequency fs from the road surface with respect to the vehicle body 11 that is equal to or lower than the reference frequency fo selected to be 35 Hz.
Is not a frequency equal to or near the resonance frequency fr of the vehicle body 11 with the left door 3, the right door 4, the engine hood 7, and the rear gate 9. It avoids a situation in which an unpleasant vibration having a relatively large amplitude is generated by being placed in a resonance state or a state close thereto.

When the input vibration frequency fs from the road surface to the vehicle body 11 exceeds the reference frequency fo selected to be, for example, 35 Hz, the portion of the vehicle body 11 with the left door 3 and the right door 4 are accompanied. The rigidity of each of the portion, the portion with the engine hood 7, and the portion with the rear gate 9 is not increased, so that the twisting of the vehicle body 11 with the left door 3, the right door 4, the engine hood 7, and the rear gate 9 is not performed. No change in rigidity is brought about. Therefore, the resonance frequency fr of the vehicle body 11 including the left door 3, the right door 4, the engine hood 7, and the rear gate 9 is maintained at about 30 Hz and exceeds the reference frequency fo selected at 35 Hz. The input vibration frequency fs from the road surface for 11 is not set to a frequency equal to or near the resonance frequency fr.
As a result, it is possible to avoid a situation in which the vehicle body 11 is placed in a resonance state or a state close to the resonance state, which causes an unpleasant vibration having a relatively large amplitude. Further, under such circumstances, the improvement in the rigidity of the vehicle body body 11 including the left door 3, the right door 4, the engine hood 7, and the rear gate 9 gives priority to a good ride comfort for the occupant of the vehicle. As a result, the riding comfort for the occupant of the vehicle is maintained well.

A control block 65 for performing the control as described above.
8 is an example of a program executed by the microcomputer constituting the control block 65 in controlling the transmission of the control signal CP as shown by the flowchart in FIG. It is said that.

In the program shown by the flow chart of FIG. 8, after the start, in step 71, the detection output signal SB from the vibration sensor 55 is fetched, and in the following step 72, the road surface transmitted to the vehicle body 11 through the wheels 81. The input vibration frequency fs from the road surface to the vehicle body 11 is detected based on the change in the detection output signal SB that represents the vibration caused by the unevenness of the vehicle body. Then, in step 73, it is determined whether or not the input vibration frequency fs detected in step 72 exceeds 35 Hz.

If the result of determination in step 73 is that the input vibration frequency fs is 35 Hz or less, step 74
In step 7, after starting the operation of the timer,
5, the control signal CP is sent to the drive circuit 66, and the process proceeds to step 76. In step 76, it is judged whether or not the measured value TT of the timer is 10 seconds or more, and if the measured value TT of the timer is less than 10 seconds, step 7
After continuing to send the control signal CP to the drive circuit 66 by returning to step 5, the judgment is made again in step 76, and when the measured value TT of the timer is 10 seconds or more, in step 77. , After stopping the timer operation,
Return to step 71.

On the other hand, if the result of determination in step 73 is that the input vibration frequency fs exceeds 35 Hz, the process directly returns to step 71.

FIG. 9 shows a vehicle provided with another example of the variable rigidity vehicle body according to the present invention. In the vehicle shown in FIG. 9, a plurality of reinforcing pipe members 9 are provided inside a vehicle body portion 91.
A vehicle body reinforcement assembly 93 configured by connecting two is provided. Each of the plurality of reinforcing pipe members 92 is, for example,
It is formed of a metal material such as steel, and some of them have a rigidity adjusting connecting portion 94.

In the rigidity adjusting connecting portion 94, as shown in FIG. 10, metal cap members 95 and 96 are respectively provided at mutually opposing ends of the section pipe members 92A and 92B forming the reinforcing pipe member 92, respectively. It is fitted. In the metal cap members 95 and 96, the metal cap member 96 is inserted into the tip portion of the metal cap member 95, and the space between the metal cap member 95 and the metal cap member 96 is sealed by the insulating member 97. A magnetic fluid, for example, an electro-rheological fluid (ER fluid) 98 is sealed between the metal cap member 95 and the metal cap member 96 which are sealed by the insulating member 97. .. The ER fluid 98 is
On the other hand, in the state where the predetermined electric field does not act,
Although it has a relatively low viscosity, it has the property of increasing its viscosity according to the electric field under the action of a predetermined electric field. Therefore, as compared with when the ER fluid 98 is placed in a state in which a predetermined electric field does not act on it and exhibits a relatively low viscosity, the ER fluid 98 has a predetermined electric field applied thereto, When the ER fluid 98 is placed in a state where it has a relatively high viscosity, the rigidity of the stiffness adjusting connection portion 94 is increased, so that when the ER fluid 98 is placed in a state where it has a relatively high viscosity, the entire reinforcing pipe member 92. The rigidity of the vehicle body main body portion 91 is increased accordingly.

A series circuit of a voltage source 99 for supplying a DC voltage VT and a switch 100 is connected between the metal cap member 95 and the metal cap member 96, and the switch 100 is turned off. However, the DC voltage VT from the voltage source 99 is not applied between the metal cap member 95 and the metal cap member 96,
When the switch 100 is turned on, the direct current voltage VT from the voltage source 99 is applied between the metal cap member 95 and the metal cap member 96, whereby the metal cap sealed by the insulating member 97. ER fluid 98 enclosed between member 95 and metal cap member 96
Then, an electric field based on the DC voltage VT is applied.

Also in the vehicle shown in FIG. 9, the vibration sensor 55 and the circuit component 5 provided in the vehicle shown in FIG.
7 is provided with a vibration sensor 101 and a circuit configuration unit 102.
The switches 100 in each of the circuit configuration section 102 and the rigidity adjustment coupling section 94 are electrically connected as shown in FIG. 11, for example.

Under the electrical connection shown in FIG. 11, the detection output signal SB 'from the vibration sensor 101 is
It is supplied to the circuit configuration unit 102. The circuit configuration unit 102 is
The control block 103 and the drive circuit 104 are included. The control block 103 forms a control signal CP ′ on the basis of a detection output signal SB ′ representing vibration caused by unevenness of the road surface transmitted from the vibration sensor 101 to the vehicle body portion 91 through the wheels, and drives the control signal CP ′. 104
Supply to. The drive circuit 104 then controls the control signal C.
When P ′ is supplied, it forms a corresponding drive signal DP ′ and supplies it to the switch 100 in each of the plurality of stiffness adjustment connections 94.

The switch 100 in each of the plurality of rigidity adjustment coupling parts 94 is turned on when the drive signal DP 'is supplied, whereby the switch 100 and the metal cap member 95 in each rigidity adjustment coupling part 94 are connected. The DC voltage VT from the voltage source 99 is applied between the metal cap member 96 and the metal cap member 96, and the ER fluid 98 sealed between the metal cap member 95 and the metal cap member 96 sealed by the insulating member 97. The electric field based on the DC voltage VT is caused to act, and the ER fluid 98 has a relatively high viscosity.

The control block 103 includes a vibration sensor 101.
Based on the change of the detection output signal SB ′ from the vehicle, the frequency of the vibration caused by the unevenness of the road surface transmitted to the vehicle body portion 91 through the wheels, that is, the input vibration frequency from the road surface to the vehicle body portion 91 is detected. When the input vibration frequency is equal to or lower than the reference frequency, the control signal C is sent to the drive circuit 104.
Send P '. When the input vibration frequency is detected to be equal to or lower than the reference frequency, the control signal CP ′ is sent to the drive circuit 104 after that, for example, 1
Even if there is a change in the detection output signal SB 'during the predetermined period of 0 seconds, it continues regardless of the change. Therefore, each time the input vibration frequency is detected to be equal to or lower than the reference frequency, the drive circuit 10 is further operated for 10 seconds thereafter.
The drive signal DP ′ from No. 4 will be supplied to the switch 100 in each stiffness adjustment coupling portion 94. Further, the control block 103 controls the control signal C to the drive circuit 104 when the input vibration frequency exceeds the reference frequency.
Do not send P '.

At this time, the reference frequency is in a state in which the switch 10 in each stiffness adjusting coupling portion 94 is in the off state and the ER fluid 98 has a relatively low viscosity.
The resonance frequency of the vehicle body portion 91 in which the rigidity of the entire reinforcing pipe member 92 is not increased, that is, the resonance frequency of the vehicle body portion 91 in which the rigidity is not increased, for example,
A frequency slightly higher than 30 Hz, for example, 35 Hz is selected.

Under the control of the control block 103 as described above, when the input vibration frequency from the road surface to the vehicle body portion 91 is equal to or lower than the reference frequency selected to be 35 Hz, for example, the control block 103 causes the drive circuit 1 to move.
A control signal CP ′ is sent to the switch 04, so that the drive circuit 104 causes the switch 10 in each stiffness adjusting connection portion 94 to be switched.
The drive signal DP ′ is supplied to 0, and the rigidity adjustment coupling portions 94 are in a state where the rigidity is increased. On the other hand, the input vibration frequency from the road surface to the vehicle body 91 is, for example,
When the reference frequency selected to be 35 Hz is exceeded, the control block 103 sends a control signal CP ′ to the drive circuit 104.
Is not sent, and as a result, the drive signal DP ′ is not supplied from the drive circuit 104 to each of the rigidity adjustment coupling parts 94.

As a result, when the input vibration frequency from the road surface to the vehicle body portion 91 is equal to or lower than the reference frequency selected to be 35 Hz, the rigidity of the reinforcing pipe member 92 having the rigidity adjusting connecting portion 94 is increased. As a result, the bending rigidity and the torsional rigidity of the vehicle body portion 91 including the left and right doors, the engine hood, the rear gate, etc. are effectively increased. In this way, the body main body 91 including the left and right doors, the engine hood, the rear gate, etc., in which the bending rigidity and the torsional rigidity are effectively increased.
As the bending rigidity and the torsional rigidity are improved, the resonance frequency is increased from, for example, approximately 30 Hz to approximately 40 Hz. Therefore, in such a case, the input vibration frequency from the road surface with respect to the vehicle body portion 91 which is equal to or lower than the reference frequency selected at 35 Hz is equal to the resonance frequency of the vehicle body portion 91 with the left and right doors, the engine hood and the rear gate. The frequency is not set to be equal to or near the same frequency, which may cause the body portion 91 to be in a resonance state or a state close thereto, which may cause an unpleasant vibration having a relatively large amplitude. Avoided.

When the input vibration frequency from the road surface to the vehicle body portion 91 exceeds the reference frequency selected to be, for example, 35 Hz, the rigidity of the reinforcing pipe member 92 having the rigidity adjusting connecting portion 94 cannot be increased, Therefore, the rigidity of the vehicle body portion 91 including the left and right doors, the engine hood, the rear gate, etc. is not changed. Therefore, the resonance frequency of the body portion 91 including the left and right doors, the engine hood, the rear gate, etc. is maintained at about 30 Hz,
Body part 91 exceeding the reference frequency selected for z
The input vibration frequency from the road surface to the vehicle is not set to a frequency equal to the resonance frequency or a frequency in the vicinity of the resonance frequency, whereby the body portion 91 is in a resonance state or a state close thereto, and is relatively large. A situation that would cause an unpleasant vibration with amplitude is avoided. Further, under such circumstances, the improvement of the rigidity of the vehicle body portion 91 including the left and right doors, the engine hood, the rear gate, and the like is regarded as a state in which a good ride comfort for the vehicle occupant is prioritized, and the occupant of the vehicle is The riding comfort for the passenger will be maintained well.

[0052]

As is apparent from the above description, in the variable rigidity vehicle body according to the present invention, the input vibration frequency from the road surface with respect to the vehicle body is detected, and the detected input vibration frequency is For example, when the rigidity adjusting means is equal to or lower than a predetermined value selected as a frequency slightly higher than the resonance frequency under the condition that the bending rigidity and the torsional rigidity of the vehicle body part with the movable portion are not increased, the rigidity adjustment is performed. Since the means is operated to increase the bending rigidity and the torsional rigidity of the vehicle body part with the movable part, the frequency of the input vibration frequency from the road surface to the vehicle body part is equal to or lower than the resonance frequency or equal to the resonance frequency. When there is a possibility that the frequency will be in the vicinity of the resonance frequency, the resonance frequency becomes high as the bending rigidity and the torsional rigidity of the vehicle body including the movable part are increased. It is moved to the wave number side, so that the body part with the movable part is placed in a resonance state or a state close to it, with the frequency of the input vibration from the road surface being at or near the resonance frequency. The situation that would cause an unpleasant vibration having a relatively large amplitude is avoided.

Further, when the detected input vibration frequency exceeds a predetermined value, the rigidity of the body of the vehicle body including the movable portion is not increased, and the rigidity of the vehicle body of the vehicle is high. Under the running condition in which the ride comfort is prioritized, it contributes to secure a good ride comfort for the occupant.

[Brief description of drawings]

FIG. 1 is a perspective view showing a vehicle provided with an example of a variable rigidity vehicle body according to the present invention.

FIG. 2 is a sectional view showing a door partial rigidity adjusting mechanism in an example of a variable rigidity vehicle body according to the present invention.

FIG. 3 is a sectional view showing an engine hood partial rigidity adjusting mechanism in an example of a variable rigidity vehicle body according to the present invention.

FIG. 4 is a configuration diagram provided for explaining a vibration sensor in an example of a variable rigidity vehicle body according to the present invention.

FIG. 5 is a block connection diagram showing a control system for a door partial rigidity adjusting mechanism, an engine hood partial rigidity adjusting mechanism, and a rear gate partial rigidity adjusting mechanism in an example of the variable rigidity vehicle body according to the present invention.

FIG. 6 is a characteristic diagram provided for explaining resonance characteristics in an example of a variable rigidity vehicle body according to the present invention.

FIG. 7 is a characteristic diagram provided for explaining resonance characteristics in an example of a variable rigidity vehicle body according to the present invention.

FIG. 8 is a flow chart showing an example of a program executed by a microcomputer constituting a control block in an example of a variable rigidity vehicle body according to the present invention in a control operation.

FIG. 9 is a perspective view showing a vehicle provided with another example of the variable rigidity vehicle body according to the present invention.

FIG. 10 is a cross-sectional view showing a rigidity adjustment connecting portion in another example of the variable rigidity vehicle body according to the present invention.

FIG. 11 is a block connection diagram showing a control system for a rigidity adjustment connecting portion in another example of the variable rigidity vehicle body according to the present invention.

[Explanation of symbols]

 3 Left Door 4 Right Door 7 Engine Hood 9 Rear Gate 11 Body Body 13 Left Front Fender 14 Right Front Fender 21 Left Rear Fender 22 Right Rear Fender 30 Door Part Rigidity Adjustment Mechanism 31 Door Part Rigidity Adjustment Mechanism 32 Door Part Rigidity Adjustment Mechanism 33 Door Part Rigidity adjusting mechanism 34 Engine hood partial rigidity adjusting mechanism 35 Engine hood partial rigidity adjusting mechanism 36 Rear gate partial rigidity adjusting mechanism 37 Rear gate partial rigidity adjusting mechanism 40 Electromagnetic plunger 41 Engaging portion 45 Electromagnetic plunger 47 Engaging portion 50 Electromagnetic plunger 51 Electromagnetic plunger 52 Electromagnetic plunger 53 Electromagnetic plunger 55 Vibration sensor 57 Circuit component 65 Control block 66 Drive circuit 67 Electromagnetic plunger 68 Electromagnetic plunger 81 Wheel 82 Suspension device 91 Body Body part 92 Reinforcement pipe member 94 Rigidity adjustment connecting part 100 Switch

Claims (1)

Claim: What is claimed is: 1. A rigidity adjusting means for changing bending rigidity and torsional rigidity of a body part of a vehicle body, the opening adjusting means and a movable part attached to open and close the opening. Detecting means for detecting an input vibration frequency from the road surface to the body part of the vehicle body, and when the input vibration frequency detected by the detecting means is equal to or less than a predetermined value, the body body having the movable part in the rigidity adjusting means. A variable stiffness vehicle body configured to include a motion control unit for increasing a bending rigidity and a torsional rigidity of a portion.