JPS61218474A - Vibration controller for steering wheel in vehicles - Google Patents

Abstract

PURPOSE:To aim at reduction in vibrations in a steering wheel, by constituting a device so as to give damping force commensurate to vibro-velocity in a steering wheel system to be excited by vibrations in a car body, to the wheel system with an actuator. CONSTITUTION:Vibrations in a steering wheel system 5 are converted into an electric signal (vibro-accelerating signal) by a vibrograph 7 installed in a steering wheel shaft 51 and taken out, then this signal is inputted into an operational circuit 82 via a preamplifier 81 in a control circuit 8. Here, this vibro- accelerating signal is converted into a vibro-velocity signal, feeding an actuator 6 with driving power for making this acutator 6 produce damping force corresponding to the vibro-velocity signal, from a drive circuit 83. And, the damping force corresponding to the vibro-velocity produced at the actuator 6 is impressed on the wheel system 5 whereby a damping characteristic in the steering wheel system is improve, thus reduction in vibrations is promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a steering wheel vibration control device for a vehicle that suppresses steering wheel vibrations generated 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 particular, vibrations in the steering wheel cause physical and
In addition to causing mental discomfort, excessive vibration also poses a safety problem.

The main causes of vibrations in the steering wheel are thought to be fluctuations in output torque due to engine rotation during idling and unevenness of the road surface during driving. In particular, with a horizontally mounted engine and FF (front engine, front drive) system, the natural vibration of the vehicle body will occur in the idling speed region! Excessive vibrations are excited in the car body due to the closeness or existence of the a number, the increase in engine driving reaction torque, and the fact that the direction of the fluctuating torque matches the vibration direction of the car body, and this vibration continues as it is. This was transmitted to the steering wheel, and there was a significant decrease in ride quality and comfort.

Figure 6 shows the mechanism that generates vehicle body vibration, that is, steering wheel vibration! Q, (11 is the engine, (21
is a front engine mount that elastically supports the front side of the engine (1), (3) is a rear engine mount that supports the rear side, and (4) is the vehicle body. It is attached to the vehicle body (4) via mounts +2) and (3). (5) is the handle system, including the hand) v (52) and the handle shaft (5
1).

By the way, in a horizontally mounted engine, the engine (1) has a plurality of cylinders, and the cylinders are arranged at right angles 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 as the center of rotation are excited in response to fluctuating torque caused by pressure fluctuations in the cylinder in the direction of the arrow.

On the other hand, the vibration characteristics of the car body (4) 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.
There is usually 25 Hz (≠1500 times/min).

Tokuni, 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/
(minutes), the car body is excited with excessive vibrations due to resonance phenomena, which transmit vibrations to the steering wheel.

On the other hand, vibrations caused by uneven road surfaces during driving are also transmitted to the steering wheel through the vehicle body.

[Problem that the invention seeks to solve]

In this way, there are internal and external factors that cause vibrations in the steering wheel, and the magnitude and duration of the vibrations that occur vary depending on these factors. In order to reduce vibration, it is necessary to control the magnitude of the damping force, the applied time, etc.

This invention was made to solve this problem, and by driving and controlling an actuator based on the detection of vibrations in the steering wheel system, the vibrations of the steering wheel are reduced and the ride quality and comfort are improved. The object of the present invention is to obtain a vibration control device for a steering wheel.

[Failure to solve the problem]

The vibration control device for a handle according to the present invention includes: a hand) v
a vibration detector that detects the vibration of the system; an actuator that is provided in the handle system and is driven based on the detection signal from the vibration detector and applies a damping force to the handle string; and a control section that drives the actuator based on the actuator.

Here, the handle thread refers to a thread consisting of a handle and a handle shaft.

[Effect]

In this invention, since the actuator applies a damping force to the handle system according to the speed of vibration of the handle system excited by the vibration of a single unit, the vibration of the handle is reduced.

〔Example〕

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

FIG. 1 is a side view showing essential parts of an embodiment of a vibration control device according to the present invention. In the figure, (6) is hand/l
/ (52) The actuator is attached to the handle shaft (5]), and (7) is attached to the handle shaft (5).
51) A vibration meter that detects the vibration of (51) (51) is a control circuit that drives the actuator (6) f based on the vibration detection signal from the vibration meter (7). .

Fig. 2 shows an example of the actuator (6), which is a longitudinal section of an electrodynamic linear actuator that applies a damping force to the handle system (5) using the inertia of the movable mass object (9). It is a diagram. In the figure, (61) is a permanent magnet, (62
) is a cylindrical yoke, and the movable mass object (9) consists of this yoke (62) and a permanent magnet (61). (63) is a coil, (64) is a coil support that supports the coil v (63), (65) is a support spring that is disposed at the upper and lower ends of the yoke (62) and holds the entire yoke (62); ) 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).
The yoke (62) slides along the guide 1 (66) and is linearly driven in the vertical direction. (68) is a casing.

To explain the operation of the above linear actuator (6), the permanent magnet (61) is magnetized in the radial direction and fixed to the yoke (62), forming a magnetic circuit and forming a coil w (
63) is inserted, a predetermined magnetic flux density is generated.

This causes the coil (63) to be connected to the drive circuit (83) (fifth
When a driving current is supplied from the coil (see figure), an electromagnetic force is generated between the coil/l/ (63) and the permanent magnet (61) due to electromagnetic force. At this time, the electromagnetic force generated in the coil (63) based on the principle of action and reaction is transmitted to the casing (68) fixed to the handle shaft (51) via the coil support (64) e, and then to the handle system (5). act. On the other hand, the electromagnetic force generated in the permanent magnet (61) is balanced by the sum of the restoring force of the support spring (65) that fully supports the yoke (62) and the inertial force of the movable mass object (9).

FIG. 3 and FIG. 4 are an explanatory diagram and a mechanical model diagram showing the entire operation of the actuator (6), respectively. In Fig. 4, 4 is the vibration damping drive unit, Kd is the spring constant of the support spring (65), and ■ is the driving force of the actuator based on electromagnetic action proportional to the vibration speed of the handle system (5). A damping force T is applied to the handle system (5) in balance with the inertial force of the movable mass object (9), and acts as a damping action on the handle system (5). Further, the support spring (65) is used to ensure the neutral position of the yoke (62).

FIG. 5 shows a block diagram of the control circuit (8). (81) is a preamplifier circuit, (82) is an arithmetic circuit, (8
3) is a drive circuit. To explain the operation of the control circuit (8), the control circuit (8) is fixed to the handle shaft (51) and the handle thread (5) swings by the swing (7).
is converted into an electrical signal and extracted. Generally, this electrical signal is detected as a vibration acceleration signal. The electrical signal is input to a preamplifier circuit (81) and amplified. In order to reduce the vibration of the handle system (5), it is usually effective to improve the vibration characteristics of the handle system (5) by adding a damping effect, and for this purpose, the vibration acceleration signal is converted into a vibration velocity signal, A damping force handle system proportional to the vibration speed signal (
5). The arithmetic circuit (82) is a circuit for converting into a vibration velocity signal, and is mainly composed of an integrating circuit. The drive circuit (83) supplies drive power to the actuator (6) to generate a damping force according to the vibration velocity signal. With the above configuration, a damping force corresponding to the vibration speed generated by the actuator (6) is applied to the handle system (5), so the damping characteristics of the /X handle system (5) are improved.
Vibration can be reduced.

〔Effect of the invention〕

As explained above, according to the present invention, the damping force from the actuator cancels out the fluctuating torque disturbance, so the fluctuating torque disturbance applied to the steering wheel system can be reduced, and the vibration of the steering wheel is reduced and the vehicle Ride comfort, comfort and safety can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the essential parts of an embodiment of the vibration control device according to the present invention, FIG. 2 is a vertical sectional view showing the actuator, FIG. 3 is an explanatory view showing the action of the actuator, and FIG. 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. (5)...handle system, (6)...actuator, (7)...vibration meter, (8)...control circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A vibration detector that detects vibrations in the handle system; an actuator that is attached to the handle system and is driven based on a detection signal from the vibration detector to apply a damping force to the handle system; and the vibration detector A vibration control device for a steering wheel in a vehicle, comprising: a control section that drives an actuator based on a detection signal from the vehicle.