JPS60248436A - Vibration controlling device for car - Google Patents

Abstract

PURPOSE:To reduce the vibration of a body and improve a riding quality and comfortableness by detecting the turbulence of variable torque which is applied from an engine to said body, and providing an acturator which gives a braking force which offsets said turbulence, to said body. CONSTITUTION:A control circuit 8 has a kinetic strain detector 81, an arithmetic circuit 82, and a driving circuit 83. A strain signal which is proportionate to a variable torque detected by a strain gauge stuck to the surface of the flexible mount 21 of a front engine mount 2, is amplified by the kinetic strain detector 81 and inputted into the arithmetic circuit 82. The arithmetic circuit 82, which has a required gain and a phase characteristic, adjusts the gain and phase of a strain signal and transmits the signal to the driving circuit 83. The driving circuit drives an actuator 6, applies a controlling force generated by the actuator 6 to a body 4, to reduce the vibration of the body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a vehicle vibration control device that suppresses vehicle body vibrations excited by fluctuating torque disturbances from an engine.

[Prior art]

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

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In order to reduce vehicle body vibrations, we have installed a damping force control device on the Conquer Goomba, and added a vibration absorbing function to the mount mechanism that supports the engine. However, in the F, F (front engine, front drive) system with a horizontally mounted engine, the drive reaction torque of the engine is particularly large, and its direction matches the vibration direction of the vehicle body, so the fluctuating torque from the engine is caused by the engine mount. The problem arises that the vibrations of the vehicle body are excessively excited by being transmitted through the vehicle.

The engine mount is the contact point between the engine and the vehicle body, and there are many issues to consider when designing it, and the following conflicting conditions must be satisfied. In other words, in a region where the drive reaction torque is large, the engine mount needs to be rigid in order to limit the displacement of the engine and exhaust system such as the muffler!
l1% In the idling and medium to high speed ranges where the torque is relatively small, the mount needs to have low rigidity with the main purpose of vibration isolation. It is extremely difficult to achieve these conflicting conditions at a high level, and if the natural frequency of the bending mode vibration of the car body is close to or coincides with the idler rotation speed range, the vibration of the car body will increase and the ride comfort will deteriorate. There's a problem. This is because reducing vehicle body vibration, including the engine mount, is an important technical issue in improving vehicle ride comfort and comfort. Especially in horizontally mounted engines, F, F
In vehicles that use this drive system, excessive vibrations are excited in the vehicle body due to the fact that the natural frequency of the vehicle body is close to or exists in the idler/linda rotation speed region, and furthermore, the direction of fluctuating torque coincides with the direction of vibration of the vehicle body. As a result, there was a significant decline in riding comfort and comfort.

Figure 1 shows the mechanism by which vehicle body vibration occurs, where 1 is the engine %, 2 is the front engine mount that elastically supports the front side of engine 1, and 3 is the rear engine that supports the rear side. Mount %4 is the vehicle body, and engine 1 is connected to vehicle body 4 via engine mount 2.3.
is installed on. 5 is a seat. By the way, in a horizontally mounted engine, the cylinder arrangement of the engine 1 is perpendicular to the direction across the vehicle body 4, that is, the longitudinal direction. Therefore, during operation of the engine, the engine 1 receives torque due to cylinder pressure fluctuations, and a rocking motion is excited in the direction of the arrow, as shown in FIG. On the other hand, there is a natural frequency in which the entire vehicle body 4 has an elastic mode in which it is elastically deformed as indicated by the broken line. In particular, when the frequency of the rocking motion of the engine 1 in the idler rotation speed region matches or is close to the natural frequency of the vehicle body 4 which has elastic deformation, the vehicle body 4 is excited with excessive vibration due to resonance, which causes the seat 5 to also vibrate. This reduces ride quality and comfort, causing physical and mental pain to passengers.

[Summary of the invention]

This invention was made with the aim of improving this drawback, and includes an actuator that detects the fluctuation torque disturbance applied to the vehicle body from the engine and applies a damping force to the vehicle body to cancel out the fluctuation torque disturbance. The present invention provides a vibration control device for a vehicle that reduces vehicle body vibration and improves riding comfort and comfort.

[Embodiments of the invention]

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

In FIG. 2, the same reference numerals as in FIG. 1 indicate the same parts, so a description thereof will be omitted. 6 is an actuator mounted on the vehicle body 4, 7 is a strain gauge connected to the front engine mount 2, and 8 is a control circuit that detects a signal from the strain gauge 7 and drives the actuator 6.

FIG. 3 is a detailed view of the front engine mount 2 of the engine 1. The engine 1 has an elastic mount 21 made of rubber or the like.
The mount is elastically attached to the vehicle body 4 via a holder 22 that fixes the mount. A strain gauge 7 is attached to the surface of the elastic mount 21, and the amount of strain on the elastic mount 21 is measured by the gauge 7 to detect fluctuating torque disturbance from the engine 1. Then, an actuator 6 mounted on the vehicle body 4 is driven by a detection signal from the strain gauge 7 via a control circuit 8.

FIG. 4 is a block diagram of the control circuit 8, and 81 is the motor r4-t.
82 is a calculation circuit, and 83 is a drive circuit.

i.e. elastic mount of front engine mount 2)
A strain signal proportional to the fluctuating torque detected by the strain gauge 7 attached to the surface of the strain gauge 21 is amplified by the dynamic strain detector 81 and input to the arithmetic circuit 82 . The arithmetic circuit 82 is a circuit having required gain and phase characteristics, and adjusts the gain and phase of the distortion signal and transmits it to the drive circuit 83. The drive circuit 83 drives the actuator 6 and
The control force generated by the control force is applied to the vehicle body 4 to reduce the vibration of the vehicle body 4.

FIG. 5 shows an embodiment in which an electrodynamic linear actuator is applied to the actuator 6. In the figure, 61 is a permanent magnet, 62 is a cylindrical yoke, 63 is a coil, and 64
65 is a coil support that supports the coil 63; 65 is a support spring that is disposed at both the upper and lower ends of the yoke 62 to hold the yoke;
6 is a guide rod, and 67 is a slide bearing fixed to the upper and lower ends of the yoke 62. This bearing 67 slides along the guide rod 66, and the yoke 62 is driven in the vertical direction. 68 is a casing. To explain the operation of the electrodynamic linear actuator, the permanent magnet 61 is radially magnetized and fixed to the yoke 62 to form a magnetic circuit, and a predetermined magnetic flux density is generated in the gap where the coil 63 is inserted. With this configuration, the drive circuit 8 is connected to the coil 63.
When current is supplied from 3, the coil 63 and the permanent magnet 61
An electromagnetic force is generated between the At this time, the electromagnetic force generated in the coil 63 is transmitted to the casing 68 fixed to the vehicle body 4 via the coil support 64, and acts on the vehicle body 4. On the other hand, the electromagnetic force generated in the permanent magnet 61 is due to the restoring force of the support spring 65 that supports the yoke 62 and the yoke 62 and the permanent magnet 61.
It matches the sum of the inertial forces. These mechanical models are
As shown in the figure. 9 is an additional mass that is the sum of the masses of the yoke 62 and the permanent magnet 61, and the support spring 65 has a spring constant Rd. U is an electromagnetic force acting between the coil 63 and the permanent magnet 61, and 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. Further, the support spring 65 serves to ensure the neutral position of the yoke.

With the above configuration, the engine 1 generates electricity and the vehicle body 4
The fluctuating torque disturbance transmitted to the engine mount 2 is detected by the strain gauge 7 attached to the elastic mount 21 of the engine mount 2 as an electrical signal with an amount of strain proportional to the magnitude of the fluctuating torque disturbance. Then, the input signal is passed through the dynamic strain detector 81 to the arithmetic circuit 82 and becomes an input signal to the drive circuit 83 with gain and phase characteristics that satisfy a predetermined control law, thereby operating the actuator 6. Thus from actuator 6.

The generated control force moves in a direction to prevent vibration of the vehicle body 4,
Vibration is reduced and the ride quality and comfort of the vehicle can be improved.

In the embodiment of the present invention, the strain gauge 7 for detecting the variable torque is provided on the front engine mount, but it may be provided on the rear engine mount side. Moreover, as the actuator 6, it is also possible to use a pneumatic or hydraulic actuator in addition to a linear actuator.

[Effects of the Invention] As explained above, according to the present invention, an actuator installed in a vehicle body that vibrates in response to fluctuating torque disturbance from the engine, a strain gauge that detects fluctuating torque from the engine, and a signal from the strain gauge. Equipped with a control circuit that drives the actuator based on the control circuit, it is possible to reduce fluctuation torque disturbances applied to the vehicle body, which reduces vehicle body vibration and improves the ride quality and comfort of the vehicle. be.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the vibration generation mechanism of a vehicle. Fig. 2 is a block diagram of a vibration control device according to the present invention, Fig. 3 is a partially enlarged view of an engine mount, Fig. 4 is a block diagram of a control circuit, Fig. 5 is a sectional view showing an example of an actuator, and Fig. 6 is a diagram of a dynamic model of an actuator. 1...Engine, 2 front engine mount, 4
...Vehicle body, 6.Actuator, 7.Strain gauge, 8.Control circuit, 21.Elastic mount. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Figure 3 Figure 5

Claims (1)

[Claims] An actuator installed on the vehicle body that generates vibrations in response to fluctuating torque disturbances from the engine, and a strain gauge attached to the engine mount.The strain gauge detects a strain signal proportional to the fluctuating torque disturbance, and based on the strain signal, A vibration control device for a vehicle, comprising a control circuit that controls and drives the actuator.