JPS59156860A - Vibration controller for car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a vibration control device for a vehicle, and is particularly suitable for reducing vibrations in the left-right direction of a long vehicle in the longitudinal direction to improve riding comfort. The present invention relates to a vibration control device for a vehicle.

[Background of the invention]

A conventional vibration control device for a vehicle has a structure in which a vehicle body is supported on a bogie via a spring and a dashi pot, and an air spring is attached to the spring and dashi pot (hereinafter simply referred to as an elastic support member), and the upper and lower parts of the vehicle body are There is a system in which the internal pressure of the air spring is controlled using vibration acceleration as a control input. However, in such a configuration, the operating direction of the air spring is only in the vertical direction, and it is possible to control only the vertical vibration of the vehicle body, and among the lateral vibrations of the vehicle body, lower center rolling, that is, rolling with the center of vibration below the vehicle body, can be controlled only. However, there is a drawback in that it is not effective in controlling lower center rolling, that is, rolling with the center of swing above the vehicle body. Furthermore, since the air spring is single-acting, that is, it can only apply operating force in one direction, it has a drawback of poor controllability.

[Purpose of the invention]

In view of the above points, the present invention provides a vehicle body vibration control device that can control the lateral vibrations such as lower center rolling, lower center rolling, and yawing of the vehicle body with a single simple control, and can significantly reduce the lateral vibrations of the vehicle body. It is intended to provide.

[Summary of the invention]

In the present invention, even if the vibration input from the track to the vehicle is random, the elastic support member 4 is mounted on the bogie 3 as shown in FIG.
The left-right vibration system of the vehicle body 2 supported via As shown in 3-, the vehicle 4' has a rocking center at the center in the longitudinal direction of -2, and the front part 2f of the vehicle body, the front bogie 3f, 1
The lfr elastic support member 4f, the vehicle body rear portion 2r, the rear truck 3r, and the rear elastic support member 4r each swing in opposite directions.

It has each natural vibration mode such as yawing.

When the vehicle has a plurality of natural vibration modes as described above, each has a different frequency, so that, for example, when the vehicle body 2 is noticeably yawing, other vibration modes are not present. In other words, since selective resonance is occurring, we focused on the fact that if we can control each individual vibration mode, we can control all the left and right vibrations.

A double-acting positive fluid pressure operating mechanism is provided side by side with respect to the elastic support member in the left-right direction, and after the left-right vibration acceleration of the vehicle body 2 is detected by a detector, the control valve is operated by a control circuit to activate the double-acting positive fluid. Controls the internal pressure of the pressure actuation mechanism. In any vibration such as lower center rolling, lower center rolling, or yawing, a double-acting positive fluid pressure operating mechanism is provided for the elastic support member near the elastic support member that has a large displacement. Vibration is also reliably controlled, and the vehicle body 2 can easily select any component to resonate with random vibrations from the track.
Certain vibration modes are controlled to be small, while other vibration modes are made thicker.There is no control interference, and the lateral vibration of the vehicle 1 is always significantly reduced. .

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. FIG. 4 is a control circuit diagram of the front bogie section in an embodiment of the vehicle vibration control device according to the present invention, and FIG. 5 is a control circuit diagram of the rear bogie section in the embodiment of FIG. 4. In the figure, 2f is the front part of the vehicle body, 2r is the rear part of the vehicle body, and below each is a front bogie 3f and a rear bogie 3.
r is arranged and supported by the front truck 3f and rear truck 3r via the front elastic support member 4f and rear elastic support member 4r. 5f is the front 1i dynamic fluid pressure actuated jf & tree which is arranged in parallel with the particle elastic support member 4f so that the operating direction is in the left-right direction of the vehicle body 2, and 5r is the rear elastic support member. 4r is a rear double-acting fluid pressure operating mechanism provided in parallel with the front double-acting fluid pressure operating mechanism 5f. 6f and 6r are the front double-acting fluid pressure operating mechanism 5f and the rear double-acting fluid pressure operating mechanism 5f. An electromagnet 11, a flapper 12, nozzles 13 and 13', which control the position double-acting fluid pressure operation mechanism 5r,
A front fluid pressure control valve and a rear fluid pressure control valve are composed of main valves 14 and 14'. 7f and 7r are the front part 2f of the vehicle body
, a front double-acting hydraulic motor @51. These are a front vibration detector and a rear vibration detector that detect vibrations of the vehicle body 2 in the left-right direction, which are provided near the rear double-acting hydraulically operated lug mechanism 5r.

8f is a front control circuit which inputs the detection result of the front vibration detector 7f and outputs a control signal for the front fluid pressure control valve 6f, and 8f inputs the detection result of the rear vibration detector 7r and outputs a control signal for the front fluid pressure control valve 6f. This is a downstream control path that outputs a control signal for the fluid pressure control valve 6r. 9f and 10f are compensation circuits and servo amplifiers that constitute the preceding control circuit 8f, and 9r and 10r are compensation circuits and servo amplifiers that constitute the rear control circuit 8r.

In such a configuration, the output of the front vibration detector 7f is fed back to the front control circuit 8f, compensated and amplified so that the gain and phase are optimal for each frequency, and the output from the front control circuit 8f is It is input as a control signal to the front fluid pressure control valve 6f.

In the WI position fluid pressure control valve 6f, the electromagnet 11f is actuated by the control 11 signal to move the flapper 12f, and the back pressure between the flapper 12f and the nozzles 13f, 13'f is increased or decreased, and the main valve 14f, One of 14'f supplies air and the other exhausts air. As mentioned above, the double acting type fluid pressure actuating mechanism 9s5f is connected to this IT position body pressure control valve 6f, and the double acting type fluid pressure actuating mechanism 5f is the front part of the vehicle body 2f
It operates in the direction of reducing the left and right vibration acceleration. next,
The yawing component in the output of the rear vibration detector 7r has the same magnitude and opposite phase as the output of the front vibration detector 7f, and is fed back to the rear control circuit 8r in the same way as the front part of the vehicle body described above, and is fed back to the rear fluid control circuit 8r. Operate the pressure control valve 6r.

The rear double-acting fluid pressure control valve 6r causes the rear double-acting fluid pressure operating mechanism 5r to operate in the same magnitude as the front double-acting fluid pressure operating mechanism 5f by the amount of yawing, thereby controlling the main rear section 2r. Reduces left and right vibration acceleration.

As described above, each vibration mode is limited, and each vibration mode and frequency have a corresponding relationship, so even if a plurality of vibration modes are mixed, control is performed according to the frequency. Therefore, vibration can be reduced by controlling each of the front and rear double-acting fluid pressure actuating mechanisms 5f and 5r so as to suppress each vibration component. Vibration acceleration generally increases at high speeds, and the yawing mode is dominant at high speeds, so it is better to say that yawing is predominant at high speeds rather than that vibration modes are mixed, and the front and rear compensation circuits Also in 9f and 9r, it is sufficient to mainly compensate for the yawing frequency.

In the above embodiment, a configuration in which compressed air is used as the working fluid of the front and rear double-acting fluid pressure operating mechanisms has been described, but it is also possible to use a hydraulic cylinder as the double-acting fluid pressure operating mechanisms. Moreover, the same effect can be achieved even if pressure oil is used as the working fluid, and the present invention is not limited to the above embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, a double-acting fluid pressure operating mechanism is provided in parallel in the left-right direction of the vehicle body in the vicinity of the spring and dashpot, which are elastic support members, to detect left-right vibration of the vehicle body,
By compensating and amplifying the detection result in a control circuit and using it as a control input to control the double-acting fluid pressure operating mechanism using a control valve, any lateral vibration components acting on the vehicle body can be controlled, and the lateral vibration of the vehicle body can be significantly reduced. can be reduced to

[Brief explanation of the drawing]

1 and 2 are front views showing a bogie section of a vehicle in a state of vibration in the left-right direction of the vehicle body, FIG. 3 is a perspective view showing a yawing state of the vehicle, and FIG. 4 is an illustration of a vibration control device for a vehicle according to the present invention. A control circuit diagram of the front part of the vehicle body showing an example,
FIG. 5 is a control circuit diagram of the rear portion of the vehicle body in one embodiment of FIG. 4.

Claims (1)

[Claims] 1. In a vehicle in which a vehicle body is supported on a bogie via a spring, a double-acting active fluid pressure operating mechanism arranged with an operating direction in the left-right direction of the vehicle body and attached to the spring and detecting vibrations in the left-right direction of the vehicle a vibration detector; a compensation circuit that compensates for the detection result of the vibration detector and outputs a control signal for reducing lateral vibration of the vehicle; A vehicle vibration control device comprising a control means for controlling vibration.