JPS61207213A - Vibration controller for vehicles - Google Patents

Abstract

PURPOSE:To make a feeling of driving comfortableness so better as well as to improve durability in an actuator, by impressing an alternating current on an actuator driving coil at the time of stoppage but a direct current at the time of driving, respectively, with a vibration detecting signal and thereby making a movable mass body come into both vibration and stationary states. CONSTITUTION:A signal of the varying torque disturbance of an engine 1 detected by a vibration sensor 7 is inputted into a control circuit 8, feeding an actuator 6 with it as driving power. With this, damping force of the actuator 6 is impressed in a direction of damping vibrations in a car body 4 whereby these vibrations in the car body 4 are reduced. The engine is discriminated as it is at idling or driving by an engine speed detector, and at the times of idling and driving, both AC and DC currents are impressed on a driving coil 63 of the actuator 6 from the control circuit 8. And, a movable mass body 9 is made to come into both opened and fixed states, and a vibration of the body 9 due to a road surface and an impact to a casing 68 due to disturbance are avoided, thereby preventing a noise from occurring, thus durability in the actuator is improved.

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 stain 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. I'm trying.

However, with a horizontally mounted engine, FF (front engine,
In the 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 C) change m) /l/ is transmitted from the engine via the engine mount. This brings up the problem of excessive vibrations in the vehicle body.

Therefore, the engine mount must satisfy the following conditions. In other words, in areas where the driving reaction torque is large, the engine mount must be made rigid to limit the amount of displacement of the engine and exhaust system such as the muff. , the mount needs to have low rigidity to provide 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 vehicle body is close to or coincides with the idling speed range, the vibration of the vehicle body will be large9 and the ride comfort will be reduced. There is a problem of deterioration.

Reducing vehicle body vibration, including the engine mount, is an important technical issue in improving vehicle ride comfort and comfort. Especially F with a horizontally mounted engine? 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 idling speed region, and furthermore, the direction of the fluctuating torque coincides with the vibration direction of the vehicle body. There was a significant decline in ride quality and comfort.

Figure 6 shows the vehicle body vibration generation mechanism.
(υ is the engine% (2) is the engine (front engine mount that fully elastically supports the front side of υ, (3) is the rear engine mount that supports the rear side), (4
) is the vehicle body, and the engine (1) is attached to the vehicle body (4) K via the engine mount +2), (3) t.
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.

For this reason, the behavior of the engine (1) is such that rocking vibrations about the drive shaft are excited in response to fluctuating torque due to pressure fluctuations in the cylinder in the direction of the arrow.

On the other hand, the vibration characteristics of the car body (41) include a natural frequency that vibrates in an elastic mode in which the entire car body bends and deforms, as shown by the broken line.
Usually 25Hz (≠1500 times/min)].

In particular, in the idling speed range (1,200 to 1,600 explosions/min for a 4-cylinder engine) where the frequency of the rocking vibration of the engine (υ) and the natural frequency of the vehicle body match or are close to each other, the vehicle body is subject to excessive vibration due to the resonance phenomenon. This causes: 1. Vibration is transmitted to the seat, reducing ride quality and comfort.

Causes physical and mental pain to the crew.

On the other hand, prior to filing this application, the present applicant had provided a vibration control device for suppressing vibrations of structures such as bridges (for example, Japanese Patent Laid-Open No. 57-041093).

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 for a vehicle has not yet been realized. In addition, as mentioned above, there are times when a vehicle is stopped (idling) when vibration reduction is required and when it is running when vibration reduction is not required so much, so it is difficult to apply the vibration control device in the above publication to the vehicle as is. is not desirable.

In particular, the vibration control device has a movable part called a movable mass object, and when the vehicle is running, the movable mass object vibrates due to input from the road surface or unevenness of the road, and under large disturbances, it collides with the casing. However, there are problems unique to vehicles, such as the generation of noise, and the constant movement of moving mass objects, which causes wear of attached parts such as slide bearings.

This invention was made to solve these problems, and it not only reduces vehicle body vibration and improves riding comfort and comfort, but also improves the durability of the actuator that applies vibration damping force to the vehicle body. The object of the present invention is to obtain a vibration control device for a vehicle with improved performance and reliability.

[Means for solving problems]

A vibration control device for a vehicle according to the present invention includes a vibration detector for detecting vibrations of an engine or a vehicle body, and a movable mass object attached to the vehicle body via an elastic body. an actuator that is driven to apply a damping force to a single unit; a control section that drives the actuator based on a detection signal from the vibration detector; and a running state detection means, and the control section is configured to control the actuator when The vehicle is equipped with a drive circuit that applies an alternating current to a coil that drives the motor to vibrate the movable mass object when the vehicle is stopped, and applies a direct current to a coil that drives the movable mass object when the vehicle is running to fix the movable mass object.

[Effect]

In this invention, a damping force that balances the inertial force of the movable mass object is applied to the vehicle body so as to offset the fluctuating torque disturbance acting on the vehicle body due to the drive of the actuator, so that vibrations of the vehicle body are reduced.

Also, when traveling, a DC current is applied to the drive coil of the actuator, and due to the application of this DC current, the movable mass object receives a static magnetic force, moves in one direction, is pressed against the inner wall of the actuator, and is fixed. state.

〔Example〕

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

FIG. 1 is a configuration diagram showing an embodiment of a vibration control device according to the present invention. In the figure, (6) is an actuator attached to the vehicle body (4), (7) is a vibration sensor fixed to the engine (1) and detects the vibration of the engine (υ), (8)
is a control circuit that drives the actuator (6) based on a vibration detection signal from the vibration sensor (7).

Figures 2 and 3 show an example of the actuator (6), which is an electrodynamic type IJ that applies a damping force to the vehicle body (4) using the inertial force of the movable mass object (9). FIG. 6 is a longitudinal cross-sectional view of the actuator (6) when the actuator is stopped (idling) and when the actuator is running, respectively.
, i.e. the open and fixed states of the movable mass object (9). In Figure 2, (61) is a permanent magnet, (62) is a cylindrical yoke, and a movable mass object (
Shun consists of this yoke (62) and a permanent magnet. (6
3) is a coil μ, (64) is a coil support that supports the carp/L/(63), (65) is a support that is arranged at the upper and lower ends of the seek (62) and holds the yoke (62), (6
6) is a guide rod that passes through the yoke (62), and (67) is a slide bearing fixed to the upper and lower ends of the yoke (62).
) are driven linearly in the vertical direction. Also, (68)
(69) is a stopper.

To explain the operation of the above linear actuator, the permanent magnet (61) is magnetized in the radial direction and the yoke (61) is magnetized in the radial direction.
2) and forms a magnetic circuit to form a carp A/(63)
A predetermined magnetic flux density occurs in the gap where the magnetic flux is inserted. As a result, when an alternating current drive current is supplied to the carp μ (63) from the drive circuit (see Figure 5), there is a gap between the carp μ (63) and the permanent magnet (61) due to electromagnetic force. Electromagnetic force is generated. At this time, based on the principle of action and reaction, the electromagnetic force generated in the coil /L/ (63) is transferred to the coil support (63).
Caking (68) fixed to the vehicle body (4) via
) and acts on the vehicle body (4). On the other hand, a permanent magnet (
The electromagnetic force generated in 61) is balanced by the sum of the restoring force of the support spring (65) supporting the seek (62) and the inertial force of the movable mass object (9).

The above mechanical structure /I/ is shown in FIG. Rd is the vibration damping drive unit, and Rd is the spring constant of the support spring (65).

In addition, U is the driving force of the actuator based on electromagnetic action that is proportional to the vibration speed of the engine 0), and the vehicle body (4) K
A damping force T is applied to the vehicle body while cooperating with the inertia force of the movable mass object (9), and acts as a damping effect on the vehicle body (4). Further, the support spring (65) is for ensuring the neutral position of the yoke (62).

With the above configuration, the driving force Ui is applied to the vehicle body (4) in proportion to the vibration speed generated by the actuator (6), so that the damping characteristics of the vehicle body are improved and vibrations can be reduced.

As mentioned above, during idling, a traffic current is applied to the coil 1v (63) of the actuator shown in FIG. 2, and the actuator (6) operates. That is, the movable mass object (9) is in a movable state. On the other hand, during normal running, a DC current is applied to the carp /l/ (63), and the movable mass object (9) is in the fixed state shown in FIG. That is, by applying a direct current, an electromagnetic effect acts between the coil (0) and the permanent magnet (61), and a static magnetic force acts on the movable mass object (9), which is in a movable state. The mass object (9) is pulled down (raised) in one direction and becomes in a fixed state in contact with the stopper (69).

As described above, the movable mass object (9) is in a fixed state during normal driving, so vibrations of the movable mass object (9) due to input to the vehicle from the road surface or unevenness of the road, and large external disturbances may cause the casing ( 68) to a mobile mass object (9)
It is possible to avoid collisions between the actuator (6), noise generation and abrasion of attached parts of the movable mass object (9), etc.
It is possible to solve problems related to the service life and reliability of the product.

FIG. 5 shows a block diagram of the control circuit (8). (81) is a vibration detection circuit, (82) is an arithmetic circuit,
(8) is a drive circuit, and (41) is a carrot rotation speed detection circuit as a running state detection means.

Next, the operation will be explained.

The vibration sensor (7) detects the fluctuation of nine engines (υ and f).
The i/i disturbance is extracted as an electrical signal and input to a vibration detection circuit (81), and the signal amplified by this vibration detection circuit (81) is input to an arithmetic circuit (82).

The arithmetic circuit (82) is a circuit having predetermined gain and phase characteristics, and adjusts the gain and phase of the electrical signal and transmits it to the next drive circuit (83).

The drive circuit (gate) supplies power to drive the actuator (6), and thereby,
The control force generated from the actuator (6) is transferred to the vehicle body (4).
The vibration of the vehicle body (4) can be actively reduced by applying the vibration in a direction that suppresses the vibration of the vehicle body (4).

The engine speed detection circuit (41) is provided to distinguish between idling and running, and when the engine speed falls within the range of running speed, the drive circuit (&3
) supplies direct current to the carp /L/ (63) in FIG. 2, and the movable mass object (9) becomes in the fixed state shown in FIG. 3.

The input signal to the carrot rotation speed detection circuit (41) is sent from the vibration sensor (7).
It may also be taken from a terminal (not shown) of the base.

Further, in the above embodiment, the vibration sensor (7) is connected to the engine (
1), but the vibration sensor (7) is attached to the vehicle body (4).
) to detect vibrations of the vehicle body (4).

〔Effect of the invention〕

As explained above, according to the present invention, the vibration damping force from the actuator cancels out the fluctuating torque disturbance, so the fluctuating torque disturbance applied to the vehicle body can be reduced, and the vibration to the vehicle body is reduced, thereby improving the ride quality of the vehicle. and comfort can be significantly improved.

In addition, the movable mass of the actuator is operable only when idling, that is, when necessary, and is fixed during normal driving, which eliminates the negative effects of being in a movable state even when driving, thereby increasing the reliability of the actuator. can significantly improve performance.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of the vibration control device according to the present invention, Fig. 2 is a longitudinal cross-sectional view showing the state of the actuator during idling, and Fig. 3 is a longitudinal cross-sectional view showing the state of the actuator during driving. 4 is a dynamic model μ diagram of the actuator, FIG. 5 is a block diagram of the control circuit, and FIG. 6 is an explanatory diagram showing the vibration generation mechanism of the vehicle. (υ...engine, (4)-V vehicle body, (6)--actuator, (n...vibration sensor, (8)...control circuit, (9)...movable mass object, ( 41)...Engine speed detection circuit (driving state detection means), (83)
...Drive circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) It has a vibration detector that detects vibrations of the engine or grass, and a movable mass object attached to the grass via an elastic body, and is driven based on the detection signal from the vibration detector to apply vibration damping force to the vehicle body. a control section that drives the actuator based on a detection signal from the vibration detector, and a running state detection means, and the control section applies an alternating current to a coil that drives the actuator when the vehicle is stopped. A vibration control device for a vehicle, comprising a drive circuit that applies electricity to vibrate the movable mass object, and applies DC current to fix the movable mass object during traveling.