JP2007216945A - Automobile vibration damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automobile vibration damping device which reduces the amplitude of a seat part etc. by reaction force of a vibrating means and improves ride comfort. <P>SOLUTION: This automobile vibration damping device is adapted to an automobile wherein a power plant to which an engine and a transmission etc. are coupled is supported by a vehicle body on an engine mount for shutting off vibration. Since the vibrating means for generating vibration different from vibration of the engine is provided, the amplitude of the seat part etc. is reduced by reaction force of the vibrating means. When a vibration mode of the vehicle body is adjusted so as to become a node in the vicinity of the seat part, the amplitude in the vicinity of the seat part is reduced, and ride comfort is improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an automobile vibration damping device capable of reducing the amplitude of a seat part and a handle part in a vehicle equipped with an engine such as an automobile and improving riding comfort.

  In general, a power plant that combines an engine with a transmission, a transaxle, etc. is supported by an engine mount for the purpose of blocking high-frequency vibrations. On the other hand, when the car is stopped, etc., the engine performs idling, but because it is driven at a low speed, the torque fluctuation is larger than that during driving, and low-frequency vibrations are transmitted through the engine mount. Body vibration is generated by engine vibration. This low-frequency vibration is transmitted to the occupant through the floor panel, thereby obstructing the ride comfort of the occupant.

  If it demonstrates concretely according to drawing, FIG. 7 will show typically the vehicle body vibration at the time of idling driving | operation. Here, the power plant 1 such as an engine is supported on the vehicle body 3 via an engine mount 2. However, the engine mount 2 may lack vibration isolation performance when the frequency of the excitation force is low, such as during idling. At this time, as shown by the broken line in the figure, the vehicle body 3 vibrates greatly, and the seat portion 4 and the handle portion 5 are displaced, so that the riding comfort is deteriorated. In addition, a low frequency booming noise is generated. Furthermore, although the vehicle body structure is regarded as a rigid body in a very low frequency range, it must be considered as an elastic body when the frequency reaches 10 c / s.

In addition, to improve the characteristics of the engine mount. Patent Documents 1 and 2 have been proposed. The vibration isolator disclosed in Patent Document 1 is connected by a spring means so as to be capable of relative movement, a magnet is attached to one of the members, and a conductive member extending through a magnetic field is disposed opposite to the other member so that the damping rate is increased. Is an improvement. The anti-vibration mount disclosed in Patent Document 2 includes a rubber elastic body, a magnet, and a conductor, and attenuates vibration by using an eddy current resistance generated when the conductor crosses the magnetic field. .
Further, for example, a vibration isolator for a vehicle as shown in Patent Document 3 has been proposed as a means for reducing transmission of vibrations during low-speed rotation of the engine and vibrations during high-speed rotation to the vehicle body. In a vibration isolator supported by a rubber elastic body, a permanent magnet and a conducting wire that crosses the magnetic field of this permanent magnet are provided, and in the damping region, which is a low frequency range, the conducting wire is closed with a switch to increase the spring constant, and the high frequency In the anti-vibration region, which is a region, the conducting wire is opened, the spring constant is reduced, and the damping coefficient is reduced.
JP-A 63-149446 Japanese Utility Model Publication No. 4-113348 Japanese Utility Model Publication No.59-68838

However, the following problems existed in the conventional automobile vibration control device.
1) In the improvement of the spring characteristics of the engine mount shown in Patent Documents 1 and 2, it is difficult to effectively block the low frequency vibration during idling operation and the high frequency vibration during high speed operation.
2) Also, as shown in Patent Document 3, in the case of vibration suppression by selectively switching two spring constants with a switch, the engine speed changes continuously from low speed to high speed. In some cases, there is a region where the vibration cannot be cut off, and the vehicle body vibration is generated and transmitted to the occupant via the floor panel.

  The present invention has been proposed in view of the above, and the vibration means is disposed at a position different from the engine mount, and the handle portion and the seat portion are adjusted to be vibration nodes, thereby reducing the amplitude and improving the ride comfort. The purpose is to improve.

  The present invention relates to an automobile vibration damping device for an automobile in which a combined power plant such as an engine and a transmission is supported by a vehicle body with an engine mount for the purpose of vibration isolation, and generates vibrations different from engine vibrations. A vibration means is provided.

  The present invention is characterized in that the vibration means is disposed at a position different from the engine supported by the engine mount.

  The present invention is characterized in that a plurality of the excitation means are provided.

  The present invention is characterized in that the excitation means vibrates an auxiliary mass attached to a linear actuator.

  The present invention is characterized in that the excitation means operates when the engine is idling and the vehicle speed is zero.

  The present invention is characterized in that the vibration means is attached to a vehicle body frame.

  The present invention is characterized in that the vibration means is attached to a rear end portion of a vehicle body frame.

  The present invention is characterized in that the vibration means is attached to a bumper attachment portion.

  The present invention is characterized in that the excitation means is mounted inside a bumper.

  The present invention is characterized in that the vibration means is attached inside a trunk.

  The present invention is characterized in that the excitation means is attached under the seat.

  The present invention is characterized in that two of the excitation means are installed and are driven with mutually independent phases.

  The present invention is characterized in that a plurality of the exciting means are installed and are driven at different phases.

  The present invention is characterized in that the reference signal of the excitation signal is any one of an ignition current, a distributor current, a spark plug current, an engine speed pulse, an engine vibration waveform, and a fuel injection timing.

  The present invention is characterized in that the excitation means is driven with a predetermined time difference with respect to the reference signal of the excitation signal.

  The present invention is characterized in that the excitation force of the excitation means is changed according to any one of an accelerator opening, a change in intake air amount, a fuel injection amount, and an engine speed.

  The present invention is characterized in that the driving of the vibrating means is stopped with a predetermined engine speed as an upper limit.

  The present invention is characterized in that the predetermined engine speed is 1500 rpm.

  The present invention is characterized in that the driving of the vibrating means is stopped outside a predetermined engine speed range.

  The present invention is characterized in that a lower limit value of the predetermined engine speed is 500 to 1200 rpm and an upper limit value is 1400 to 4000 rpm.

  The present invention is characterized in that the auxiliary mass is a component part of the automobile supported by a spring element with respect to a body of the automobile, and the component part is vibrated by the linear actuator.

  The present invention is characterized in that the component is any one of a radiator, a tank, and a battery.

  The present invention is characterized in that the auxiliary mass is an accessory part of the automobile supported by a spring element with respect to the body of the automobile, and the accessory part vibrates by the linear actuator.

  The present invention is characterized in that the accessory part is any one of a spare tire and a tool.

  The present invention is characterized in that the vibration means is attached to a vehicle body frame in the vicinity of the engine mount or directly below the engine mount.

  The present invention is characterized in that the reference signal of the excitation signal is input via a communication network provided in the automobile.

  Since this invention consists of an above-described structure, there can exist an effect which is demonstrated below.

  In the present invention, a combined power plant such as an engine and a transmission is an automobile vibration control device for an automobile supported by a vehicle body with an engine mount for the purpose of vibration isolation. Since the vibration means is provided, the amplitude of the seat portion can be reduced by the reaction force of the vibration means. Further, if the vibration mode of the vehicle body is adjusted to be a node near the seat portion, the amplitude in the vicinity of the seat portion is reduced and riding comfort is improved.

  In the present invention, the vibration means is disposed at a position different from that of the engine supported by the engine mount, so that the vibration mode of the vehicle body can be easily changed, and the vibrations of the vehicle body can be changed near the seat portion. The in-vehicle vibration can be reduced by adjusting as described above.

  Further, in the present invention, since a plurality of the excitation means are provided, in a wagon type automobile having a large cargo bed area, in addition to reducing the vibration of the seat portion, the vibration generated in the cargo bed portion is reduced, and the low frequency Noise can be greatly reduced. Moreover, since the said vibration means vibrates the auxiliary | assistant mass attached to the linear actuator, even if a movable part is only an iron core and it is a severe operation condition, it can acquire high reliability. In addition, since there are no friction and wear parts, it can be used for a long time without maintenance. In addition, since the vibration means operates when the engine is idling and the vehicle speed is zero, low-frequency vibration during idling can be reliably reduced.

  Since the vibration means that generates vibrations different from the vibration of the engine is provided, the amplitude of the seat portion can be reduced by the reaction force of the vibration means. In addition, the vibration mode of the vehicle body is adjusted so as to be a node near the seat portion, and the amplitude in the vicinity of the seat portion is reduced to achieve the purpose of improving the ride comfort.

The best mode for carrying out the automobile vibration damping device of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing an example of a vehicle body to which an automobile vibration damping device according to the present invention is attached.
Here, the automobile vibration damping device 10 includes a power plant 11 to which an engine, a transmission, and the like are coupled, supported by a vehicle body 13 with an engine mount 12 for the purpose of vibration isolation, and is different from engine vibration. Excitation means 14 for generating vibration is provided. A handle 15 and a seat portion 16 are attached to the vehicle body 13. Further, the vehicle body 13 is supported by tires 18 via suspensions 17.

  The vibration means 14 used in the present embodiment is directly fixed to the vehicle body 13 at a position different from the engine without using the engine mount 12. As the vibration means 14, a linear actuator, a reciprocating motor, a voice coil motor, a moving magnet, or the like can be used. FIG. 4 shows an example of the vibration means 14 used in the automobile vibration damping device of the present invention, in which auxiliary masses 20 are attached to both ends of the movable shaft 19a of the reciprocating motor 19. As shown in FIG. When the coil is not energized, the reciprocating motor 19 is stationary at the neutral position of the motor by the magnetic force of the permanent magnet, and reciprocates when energized. In addition, the reciprocating motor 19 has a high mechanical strength because the moving part is only an iron core and does not require power supply to the movable part, so there is no fear of disconnection or the like.

  FIG. 2 is a schematic view showing an example of reduction of vehicle body vibration by the automobile vibration damping device of the present invention. In the present embodiment, the movement speed of the vibration means 14 and the auxiliary mass 20 are adjusted so that the vibration mode of the vehicle body 13 becomes a node near the seat portion 16 or the amplitude is reduced. The vibration phenomenon in the low frequency range of the vehicle body 13 is generally called “shake”, and there are primary vibration (two-node bending) and secondary vibration (three-node bending) as vibration modes. The case of two-node bending by the next vibration is shown. The timing for operating the vibration means 14 is when the engine is idling (no load) and the vehicle speed is zero (when stopped).

  When comprised as mentioned above, as shown in FIG. 2, the amplitude of the seat part 16 decreases and riding comfort can be improved.

  FIG. 3 is a schematic diagram showing an example of reduction of vehicle body vibration when the vehicle vibration damping device of the present invention is attached to the front and rear of the vehicle body 13. In this embodiment, the vibration means 14 is attached to the front part of the vehicle body 13 and the second vibration means 21 is attached to the rear part. The vibration means 14 mainly reduces the amplitude of the seat portion 16 to improve riding comfort, and the second vibration means 21 mainly reduces the amplitude of the cargo bed portion for the purpose of reducing vehicle interior noise. The present embodiment can be applied to a wagon type automobile having a large cargo bed area, and in addition to reducing the vibration of the seat portion, the vibration generated in the cargo bed portion can be reduced and the low frequency noise can be greatly reduced.

  In addition, although the above embodiment demonstrated the case where one or two excitation means were installed, three or more may be sufficient.

  In addition, the attachment location of the vibration means used in the present embodiment may be the front end portion or the rear end portion of the vehicle body frame, the bumper attachment portion or inside the bumper, the inside of the trunk, or under the seat. Further, the vibration means may be attached to the vehicle body frame near the engine mount or directly below the engine mount.

Further, as a specific example of the drive signal, a plurality of excitation means may be installed and driven at phases different from each other, for example, two excitation means may be installed and driven at opposite phases. Further, the reference signal of the vibration signal may be any of an ignition current, a distributor current, a spark plug current, an engine speed pulse, an engine vibration waveform, and a fuel injection timing. Further, the excitation unit may be driven with a predetermined time difference with respect to the reference signal of the excitation signal.
Note that the reference signal of the excitation signal may be input via an in-vehicle communication network such as a CAN (Controller Area Network) provided in the vehicle. By doing in this way, it becomes unnecessary to newly extend a signal line in the vehicle.

Furthermore, the excitation force of the excitation means may be changed according to the accelerator opening, the change in the intake air amount, the fuel injection amount, and the engine speed. Further, the driving of the vibration means may be stopped with a predetermined engine speed (less than the engine speed limit) such as 1500 rpm as an upper limit.
Further, the drive of the vibration means may be stopped outside the range of the predetermined engine speed. At this time, the lower limit value of the engine speed is set to 500 to 1200 rpm, and the upper limit value is set to 1400 to 4000 rpm, which may be set based on the degree of vibration generated according to the engine rotation of the automobile.

  Next, a modification of the vibration means will be described with reference to FIG. FIG. 5 is a schematic view showing an example of a vehicle body to which the vehicle vibration damping device according to the present invention is attached. In FIG. 5, the same parts as those in the automobile vibration control device shown in FIG. The vehicle vibration control device shown in FIG. 5 differs from the device shown in FIG. 1 in that vibration means 14 is provided in front of the vehicle body 13 and second vibration means 21 is provided in the rear of the vehicle body 13. This is the point that automobile parts are used for the auxiliary mass 20 of the vibration means 14, 21.

  Here, with reference to FIG. 6, the structure of the vibration means 14 and the 2nd vibration means 21 shown in FIG. 5 is demonstrated. FIG. 6 is a diagram showing the configuration of the vibration means 14 and the second vibration means 21 shown in FIG. The reciprocating motor 19 has an auxiliary mass 20 attached to the movable shaft 19a, and the vehicle body 13 so that the direction of vibration to be suppressed by the vehicle body 13 coincides with the reciprocating direction (thrust direction) of the movable shaft 19a. Fixed to. The auxiliary mass 20 is supported with respect to the vehicle body 13 by spring elements 23a and 23b such as vibration-proof rubber, and is configured to be movable in the thrust direction of the movable shaft 19a. As the auxiliary mass 20, a component or accessory provided in the automobile is used.

  The component parts and accessory parts here are parts that can be supported by the elastic body with respect to the vehicle body 13. Such components include, for example, a radiator, a fuel tank, a liquid reserve tank such as a coolant and a washer liquid, and a battery. The radiator needs to be connected to the engine by a pipe for supplying cooling water or the like. If an elastic body pipe is used for this pipe, the radiator main body 19 can be vibrated by the reciprocating motor 19. Also, the liquid tank can be vibrated by configuring the pipe for supplying the liquid with an elastic body. Further, the battery body can be vibrated by the reciprocating motor 19 as long as the battery has elasticity in the battery.

  The accessory parts are not essential parts for operating the vehicle, but are accessory parts such as spare tires and tools (or a tool box containing tools). . Even if these accessory parts are supported by the elastic body with respect to the vehicle body, there is no problem in operating the automobile. Therefore, the accessory parts are supported with respect to the vehicle body 13 by the elastic body, and the reciprocating motor 19 It can be vibrated.

  In addition, in FIG. 5, although the example which provides two vibration means (vibration means 14 and the 2nd vibration means 21) was shown, only any one may be provided. Further, three or more vibration means may be provided.

  In this way, it is not necessary to previously provide the auxiliary mass 20 in the automobile vibration damping device 10 by using a component provided in the automobile or an accessory part that is always included as an auxiliary mass. The weight increase when the vehicle vibration damping device 10 is attached to the vehicle body 13 can be reduced.

It is a schematic diagram which shows an example of the vehicle body which attached the motor vehicle damping device which concerns on this invention. It is a schematic diagram which shows the reduction example of the vehicle body vibration by the same vehicle damping device. It is a schematic diagram which shows the reduction example of a vehicle body vibration at the time of attaching the motor vehicle damping device before and behind the vehicle body. It is explanatory drawing which shows an example of the vibration means used for the motor vehicle damping device of this invention. It is a schematic diagram which shows an example of the vehicle body which attached the motor vehicle damping device which concerns on this invention. It is explanatory drawing which shows an example of the vibration means used for the motor vehicle damping device of this invention. It is explanatory drawing which shows typically the vehicle body vibration mode at the time of the conventional idling driving | operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Motor vehicle damping device, 11 ... Power plant, 12 ... Engine mount, 13 ... Vehicle body, 14 ... Excitation means, 15 ... Handle, 16 ... Seat part, 17 ... Suspension, 18 ... Tire, 19 ... Reciprocating motor, 20 ... Auxiliary mass, 21 ... Second vibration means, 23a, 23b ... Anti-vibration rubber (spring element)

Claims (26)

  A power plant with a combined engine, transmission, etc. is an automobile vibration control device for an automobile that is supported by a vehicle body with an engine mount for the purpose of vibration isolation, and includes an excitation means for generating vibrations different from engine vibrations. An automobile vibration control device comprising:   The automobile vibration damping device according to claim 1, wherein the vibration exciting unit is disposed at a position different from an engine supported by an engine mount.   The automobile vibration damping device according to claim 1 or 2, wherein a plurality of the vibration excitation means are provided.   The automobile vibration damping device according to any one of claims 1 to 3, wherein the vibrating means vibrates an auxiliary mass attached to the linear actuator.   5. The automobile vibration damping device according to claim 1, wherein the vibration excitation unit operates when the engine is idling and the vehicle speed is zero.   The automobile vibration damping device according to any one of claims 1 to 5, wherein the vibration means is attached to a vehicle body frame.   The automobile vibration damping device according to any one of claims 1 to 5, wherein the vibration means is attached to a rear end portion of a vehicle body frame.   The automobile vibration damping device according to claim 1, wherein the vibration means is attached to a bumper attachment portion.   The automobile vibration damping device according to any one of claims 1 to 5, wherein the vibration means is attached inside a bumper.   The automobile vibration damping device according to any one of claims 1 to 5, wherein the vibration means is attached inside a trunk.   The automobile vibration control device according to claim 1, wherein the vibration excitation unit is attached under a seat.   The automobile vibration control device according to claim 3, wherein two of the vibration excitation units are installed and are driven with phases independent of each other.   4. The automobile vibration control device according to claim 3, wherein a plurality of the excitation means are installed and driven at different phases.   The reference signal of the excitation signal is any one of an ignition current, a distributor current, a spark plug current, an engine speed pulse, an engine vibration waveform, and a fuel injection timing. The automobile vibration control device described.   The automobile vibration damping device according to claim 1, wherein the vibration excitation unit is driven with a predetermined time difference with respect to a reference signal of the vibration signal.   The automobile according to any one of claims 1 to 15, wherein the excitation force of the excitation means is changed according to any one of an accelerator opening, a change in intake air amount, a fuel injection amount, and an engine speed. Damping device.   The automobile vibration damping device according to any one of claims 1 to 16, wherein driving of the vibration exciting unit is stopped with a predetermined engine speed as an upper limit.   The vehicle vibration damping device according to claim 17, wherein the predetermined engine speed is 1500 rpm.   The automobile vibration damping device according to any one of claims 1 to 16, wherein the drive of the vibration excitation means is stopped outside a range of a predetermined engine speed.   20. The automobile vibration damping device according to claim 19, wherein a lower limit value of the predetermined engine speed is 500 to 1200 rpm and an upper limit value is 1400 to 4000 rpm.   The vehicle control system according to claim 4, wherein the auxiliary mass is a component of the vehicle supported by a spring element with respect to a vehicle body of the vehicle, and the component is vibrated by the linear actuator. Shaker.   The automobile vibration damping device according to claim 21, wherein the component is any one of a radiator, a tank, and a battery.   5. The automobile control according to claim 4, wherein the auxiliary mass is an accessory part of the automobile supported by a spring element with respect to a body of the automobile, and the accessory part vibrates by the linear actuator. Shaker.   24. The automobile vibration damping device according to claim 23, wherein the accessory part is any one of a spare tire and a tool.   The automobile vibration damping device according to any one of claims 1 to 5, wherein the vibration means is attached to a vehicle body frame in the vicinity of the engine mount or directly below the engine mount.   The vehicle vibration damping device according to claim 14, wherein the reference signal of the vibration signal is input via a communication network provided in the vehicle.

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