JPS61218429A - Vibration control device in vehicle - Google Patents

Abstract

PURPOSE:To aim at reducing the vibration of a vehicle body, by attaching an amolphous torque sensor to the attaching leg of an engine mount to detect variations in torque obtained from output signals from the sensor, as electrical signals so that a damping actuator is driven. CONSTITUTION:An amolphous sensor 7 is attached to the mounting leg 31 of an engine mount 3 on a vehicle body 4 side. In the above-mentioned sensor 7, an amolphous magnetic metal piece 71 is subjected to tensile stress and compression stress, altenately, in association with variations in the direction of a torque T which is applied to the vehicle body 4 due to the rocking vibration of an engine 1, so that the permeability of the metal piece 71 varies, and thereby, a detecting coil 74 detects variations in the strength of a magnetic field generated in a magnetically energizing coil 73. A torque detecting circuit 81 extracts an electrical signal indicating the variation component of the torque from the output of the detecting coil 73, and delivers the electrical signal to a computing circuit 82 which computes a damping signal fed to a drive circuit 83 for driving a damping actuator 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle vibration control device that suppresses vehicle body vibrations caused by engine vibrations.

[Conventional technology]

One of the important technical issues in vehicles such as automobiles is the pursuit of comfortable vehicles with excellent ride comfort and vibration resistance.

In order to improve ride comfort, we have taken measures such as installing a damping force control device for the shock absorber that supports the car body, and adding a vibration absorption function to the mount mechanism that supports the engine to reduce car body vibration. ing.

However, with a horizontally mounted engine, FF (front engine,
With the front drive (front drive) system, the driving reaction torque of the engine is particularly large and its direction coincides with the direction of vibration of the vehicle body, so the fluctuating torque from the engine is transmitted via the engine mount, causing excessive vibration of the vehicle body. The problems that occur come to the surface.

Therefore, the engine mount must satisfy the following conditions. In other words, in areas where driving reaction torque is large, the engine mount needs to be made more rigid in order to limit the amount of displacement of the engine and exhaust system such as the muffler, whereas in areas where torque is relatively small at idling and in the mid-to-high rotation range, The mount needs to have low rigidity to provide vibration isolation. It is extremely difficult to achieve these contradictory conditions in a high-dimensional manner, and if the natural frequency of the bending mode vibration of the car body is close to or coincides with the idling speed range, the vibration of the car body will become thicker (and the ride quality will be There is a problem in that the vibration of the vehicle body, including the engine mount, is reduced, which is an important technical issue in order to improve the ride quality and comfort of the vehicle.

In particular, in vehicles that use a FF drive system with a horizontally mounted engine, the natural frequency of the vehicle body is close to or exists in the idling speed range, and furthermore, the direction of the fluctuating torque coincides with the vibration direction of the vehicle body. Excessive vibrations were excited, and the ride quality and comfort were significantly reduced.

Figure 6 shows the mechanism of vehicle body vibration generation.
, (1) is the engine, (2) is a front engine mount that elastically supports the front side of the engine (1),
←]) is the mounting leg on the vehicle body side, (3) is the rear engine mount that supports the rear side, 0υ is the mounting leg on the vehicle body side, (4) is the vehicle body, and engine (1) is the engine mount. It is attached to the vehicle body (4) via the mount (2L (3).By the way, in a horizontally mounted engine, the engine (1
) There are a plurality of cylinders, and the arrangement thereof is perpendicular to the direction transverse to the vehicle body (4), that is, the longitudinal direction. Therefore, the behavior of the engine (1) is such that rocking vibration is excited in which the engine (1) swings back and forth about the drive shaft in response to fluctuating torque due to pressure fluctuations in the cylinder.

On the other hand, in the vibration/dynamic characteristics of the car body (4), there is a natural frequency (for example, 25 l (-1,500 times/min)) at which the entire car body vibrates in an elastic mode in which it bends and deforms, as shown by failure. .

In particular, in the idling speed range where the frequency of the rocking vibration of the engine (1) and the natural frequency of the vehicle body match or are close to each other (for a 4-cylinder engine, 1200 to 1600 explosions/
(2015), the car body is excited by excessive vibrations due to the resonance phenomenon, which causes vibrations to be transmitted to the seats, reducing ride quality and comfort, and causing physical and mental pain to the occupants.

Prior to filing this application, the applicant provided a vibration control device for suppressing vibrations of structures such as bridges (for example, Japanese Patent Laid-Open No. 57-41093).

The above-mentioned vibration control device detects the vibration of the object to be suppressed, operates the damping device based on this detection output, and actively applies vibration control force according to the vibration properties of the object structure. Realizes vibration reduction of objects.

[Problem that the invention seeks to solve]

However, a vibration damping device that effectively suppresses the vibrations of the vehicle described above has not yet been realized.

In addition, since the vibration of the car body is complex, we can directly detect the vibration of the excitation force applied to the car body via the engine mount,
It is considered that an effective method is to apply a damping force to the vehicle body to cancel out this excitation force, but a method for detecting this excitation force is not yet generally known.

This invention was made with the aim of solving this problem, and is a vehicle that uses a novel vibration sensor to detect the excitation force applied to the vehicle body through the engine mount, and suppresses the vibration of the vehicle body based on this detection signal. The purpose of this invention is to obtain a vibration control device.

[Means for solving problems]

A vehicle vibration control device according to the present invention includes an amorphous torque sensor that detects torque (excitation force) applied to a vehicle body via an engine mount, an actuator that applies a damping force to the vehicle body, and a detection signal from the sensor. The control circuit extracts torque fluctuations applied to the vehicle body as an electrical signal and drives the actuator based on this torque signal.

[Sakuban]

In this invention, a torque applied to the vehicle body is detected by an amorphous torque sensor, and a torque fluctuation signal applied to the vehicle body is extracted from this detection signal to drive an actuator to generate a damping force that cancels out the torque applied to the vehicle body. As a result, vibrations of the vehicle body are suppressed.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, (7) is an amorphous sensor, and the second
As shown in the figure, the engine mount (3) on the car body (4)
It is attached to the side mounting leg 0]). In the figure, (71) is an amorphous magnetic metal piece fixed to the mounting leg 01),
In this example, it is attached to the outer peripheral surface of the mounting leg 0υ. (7
2) is a mounting frame, (73) is a drive coil, and (74) is a detection coil.

Generally, when tensile stress is applied to a magnetic material, its magnetic permeability increases,
Magnetic permeability decreases when compressive stress is applied.

The rocking vibration of the engine (1) causes the mount (
When torque T is applied to the vehicle body (4) through the mounting leg 0]) of 3), tensile stress and compressive stress are alternately applied to the amorphous magnetic metal piece (71) as the direction changes. , its permeability increases or decreases. The excitation coil (78) includes
Torque detection circuit (81) of the control circuit (8) shown in Fig. 3
Since a DC or AC excitation current IE having a constant value is applied from the magnet, the strength of the generated magnetic field changes in accordance with the change in magnetic permeability. An alternating current voltage is induced in the detection coil (74) in response to variations in the strength of this magnetic field.

The magnetic material used for such applications is preferably a soft magnetic material with high magnetostriction characteristics, and amorphous magnetic metals meet this requirement and also have excellent mechanical strength.

From the alternating current signal detected by the detection coil (74), an electric signal representing a torque fluctuation component is extracted by a torque detection circuit (81) and input to an arithmetic circuit (82). The arithmetic circuit (82) generates a damping signal that cancels the torque fluctuation according to the damping law of the vibration mode, and its output is input to the drive circuit (88).

The drive circuit (88) supplies drive power to the actuator (6) based on the input vibration damping signal, and applies a damping force T6 to the vehicle body (4).

Figure 4 is a cross-sectional view of an electrodynamic linear actuator that is an example of the actuator (6), where (61) is a permanent magnet, (62) is a cylindrical yoke, (68) is a coil, and (64) is a A coil support (65) supporting the coil (68) is a support spring disposed at the upper and lower ends of the yoke (62) and holding the yoke (62), a guide rod (66) passing through the yoke (62), (67) is the yoke (6
The yoke (62) is linearly driven in the vertical direction by sliding along the guide rod (66) with slide bearings fixed to the upper and lower ends of the yoke (62). (68) is a casing. To explain the operation of this linear actuator, the permanent magnet (61) is magnetized in the radial direction and the yoke (61) is magnetized in the radial direction.
2), a predetermined magnetic flux density is generated in the gap where the coil (62) is inserted, forming a magnetic circuit. As a result, when a drive current is supplied to the coil (62) from the drive circuit (88), an electromagnetic force is generated between the coil (68) and the permanent magnet (61) due to electromagnetic force. At this time, the electromagnetic force generated in the coil (68) based on the principle of action and reaction is transmitted to the casing (68) fixed to the car body (4) via the coil support (64) and acts on the car body (4). .

On the other hand, the electromagnetic force generated in the permanent magnet (61) is caused by the yoke (6
2) and the restoring force of the support spring (66) that supports the yoke (6).
2) and the inertial force of the permanent magnet (61).

The above mechanical model is shown in FIG. (9) is the yoke (
62) and the mass of the permanent magnet (61), k
d is the spring constant of the support spring (65). In addition, U acts between the coil (68) and the permanent magnet (61) (electromagnetic force,
A damping force T, which is the sum of the electromagnetic force U and the restoring force of the support spring (65), acts on the vehicle body (4). Also, the support spring (6
5) serves to ensure the neutral position of the yoke (62).

In this way, the actuator (6) is attached to the mount (3)
The damping force T, which is large enough to cancel out the torque T (excitation force) applied to the vehicle body (4) through the mounting shaft C(1) of the vehicle body (
4), the vibration of the vehicle body (4) is suppressed.

In addition, in the above embodiment, an example was shown in which the amorphous torque sensor was attached to the mounting leg 0] of the rear engine mount (3) in Fig. 1, but
It may be attached to the mounting leg (goods), or it may be attached to both. Moreover, although the amorphous torque sensor (7) has been shown as an example in which an amorphous magnetic metal plate (71) is wrapped around and fixed to the mounting leg 0] of the engine mount (3), a metal piece may also be attached.

Further, in the above embodiment, an example using a mold-driven linear actuator was shown, but a pneumatic or hydraulic actuator may also be used.

〔Effect of the invention〕

This invention detects the torque (excitation force) applied to the vehicle body by attaching a torque sensor made of amorphous magnetic gold, which has good sensitivity and excellent mechanical strength, to the mounting leg of the engine mount. Then, a damping signal is generated from this detection signal according to the damping law, and based on this damping signal, the actuator is driven to apply damping force to the vehicle body, so it is possible to suppress the vibration of the rod body. Both have the effect of extending the life of the vibration sensor and improving its reliability.

[Brief explanation of the drawing]

Figure 1 shows a vibration control device (7) showing an embodiment of the present invention.
The configuration diagram, Fig. 2 is an enlarged sectional view showing the installed state of the amorphous torque sensor, Fig. 3 is a block diagram showing an example of the control circuit, Fig. 4 is a vertical sectional view showing an example of the actuator, and Fig. 5 is the actuator. 6 is a diagram for explaining the vibration generation mechanism of the vehicle body. (1) Engine, (2) * (3) Engine mount, (4) Vehicle body, (6) Actuator, (7) Amorphous torque sensor, (
8)...Control circuit, aL0◇...Engine mount mounting leg. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) An amorphous torque sensor attached to the mounting leg of the engine mount to the vehicle body, an actuator that applies vibration damping force to the vehicle body, and the engine torque fluctuations applied to the vehicle body from the detection signals of the above sensors are converted into electrical signals. and a control circuit that cancels the torque applied to the vehicle body by driving the actuator based on the torque fluctuation signal.