KR100456769B1 - Active vibration control device for vehicles - Google Patents

Abstract

The present invention relates to an active vibration control apparatus for a vehicle capable of generating any control force for actively controlling various frequency components generated in the vehicle. The present invention provides a device for blocking vibration of a specific frequency generated in a vehicle, the apparatus comprising: a vibration reduction target system configured to generate an excitation force (Ft) mounted on the vehicle; It is composed of an electromagnetic system is fastened to the vibration reduction target system, the control force (Fc) to the vibration reduction target system to cancel the excitation force (Ft) acting on the vibration reduction target system in accordance with the input of the drive control signal supplied from the outside A copper reducer for applying); And a controller for supplying a driving control signal to the copper reducer to adjust the intensity of the control force Fc generated from the copper reducer.

Description

ACTIVE VIBRATION CONTROL DEVICE FOR VEHICLES

The present invention relates to a dynamic reducer of a vehicle, and more particularly to an active vibration control device of a vehicle.

Typically, a copper reducer is mounted to block vibration of a specific frequency generated in a vehicle.

However, the conventional passive copper reducer is limited in preventing the vibration of the wide frequency band generated in the vehicle because the effect can be obtained only for the vibration of a specific frequency that is previously tuned (Tuning).

In order to overcome this limitation, domestic and overseas vehicle manufacturers have been developing variable dynamic reducers with adjustable mass and rigidity since the mid 90s.

To explain the development example of the variable dynamic reducer, first, a variable mass type dynamic reducer which adjusts the resonant frequency of the dynamic reducer to match the frequency of the same by adjusting the flow rate in the fluid tank was developed.

In addition, a variable stiffness dynamic reducer for controlling the natural frequency has been developed by controlling the pressure in the elastic tube to change the rigidity.

In addition, a dynamic reducer has been developed that can generate control by shaking a mass attached to a structure using pneumatic pressure.

In addition, variable dynamic reducers continue to be developed, but most variable dynamic reducers adopt a method of controlling a harmonic component by tuning a resonance frequency.

As described above, most of the techniques for variable dynamic reducers presented to date employ a semi-active method of controlling mass or stiffness.

In addition, the semi-active technology has the advantage of easy control, but there is a limit to effectively control disturbance such as engine excitation force in which excitation components of several frequencies occur simultaneously.

SUMMARY OF THE INVENTION An object of the present invention is to provide an active vibration control apparatus for a vehicle capable of generating any control force for actively controlling various frequency components generated in the vehicle.

1 is a view schematically showing a dynamic reducer installed to control the vehicle body excitation force by the engine according to an embodiment of the present invention.

Figure 2 schematically shows the structure of a copper reducer.

3 is a view showing the configuration of a copper reducer according to an embodiment of the present invention.

Figure 4 is a cross-sectional view showing a coupled state of the copper reducer shown in FIG.

5 is a system diagram showing an active vibration control flow of a vehicle according to an embodiment of the present invention.

In order to achieve the above object, the present invention provides a device for blocking vibration of a specific frequency generated in a vehicle, the vibration reduction target system for generating an excitation force (Ft) mounted to the vehicle; It is composed of an electromagnetic system is fastened to the vibration reduction target system, the control force (Fc) to the vibration reduction target system to cancel the excitation force (Ft) acting on the vibration reduction target system in accordance with the input of the drive control signal supplied from the outside A copper reducer for applying); It characterized in that it comprises a controller for supplying a drive control signal to the copper reducer to adjust the intensity of the control force (Fc) generated from the copper reducer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 to 5, a configuration of an active vibration control device for blocking vibration of a specific frequency generated in a vehicle according to an embodiment of the present invention will be described.

Embodiment of the present invention is configured to include a vibration reduction target system 110, a dynamic absorber (120), a controller 130 for generating an excitation force (Ft) mounted on the vehicle.

Here, the vibration reduction target system 110 refers to an engine and a transmission that are mounted on the vehicle to generate excitation force Ft as described above.

The vibration reducer 120 is configured as an electromagnetic system as shown in FIGS. 2 to 4, and is coupled to the vibration reduction target system 110, and is applied to the vibration reduction target system in response to an input of a driving control signal supplied from the controller 130. The control force Fc is applied to the vibration reduction target system 110 so as to cancel the excitation force Ft acting on the 110.

3 is a view showing the main components of the active copper reducer 120 actually manufactured in accordance with an embodiment of the present invention, Figure 4 is a coupling state of the copper reducer 120 actually manufactured according to an embodiment of the present invention It is a cross-sectional view.

The copper reducer 120 includes a housing 121, electromagnet parts 122 and 123 capable of generating electromagnetic force in both directions, a moving mass 124, a guide part 125, and a displacement sensor 126. To configure.

First, the housing 121 of the outer wall is fastened to the vehicle body or the vehicle-side mounting bracket 210 with a bolt, the shape is formed in a cylindrical shape as shown in Figs.

As shown in FIG. 3, the electromagnet parts 122 and 123 have a shape in which coils are wound around each core to generate bidirectional electromagnetic force.

The moving mass 124 moves in accordance with the difference in electromagnetic force in two directions generated from the electromagnet parts 122 and 123 to generate an inertial force.

Reference symbol g0 shown in FIG. 2 represents a void.

On the other hand, in the embodiment of the present invention has been described an example in which the electromagnet portion (122, 123) and the moving mass 124 is produced in a spaced state with a set gap, the electromagnet portion and the moving mass can be manufactured in one piece Be careful.

The guide part 125 functions to prevent the lateral movement of the moving mass 124 in the housing 121.

Reference numeral 410 shown in FIG. 4 denotes an oilless bearing mounted on the contact surface of the guide portion 125 and the moving mass 124.

The displacement sensor 126 functions to measure a displacement signal of the moving mass 124. According to the embodiment shown in FIG. 4, the displacement sensor 126 detects the displacement in a non-contact manner using a hall sensor.

The controller 130 supplies a driving control signal to the copper reducer 120 to adjust the intensity of the control force Fc generated from the copper reducer 120.

The controller 130 supplies currents I1 and I2 corresponding to respective coils constituting the electromagnet parts 122 and 123 based on a signal from the sensor 140 that measures vibration or excitation force Ft of the vehicle body. To control the driving of the copper reducer 120.

Since the vibration of the vehicle body needs to be measured for vibration control, the vehicle body is provided with a sensor 140 for measuring vibration or excitation force Ft.

For example, when the excitation force Ft acting on the vibration reduction target system 110 is applied, the controller 130 supplies the same strengths of the currents I1 and I2 flowing to the respective coils to provide the electromagnets 122 and 123. The magnitude of the two electromagnetic forces generated from) is adjusted, and the moving mass 124 is driven according to the difference between the magnitudes of the two electromagnetic forces to generate an inertial force having a corresponding waveform and frequency characteristic.

As shown in FIG. 5, the controller 130 controls a feed forward controller 131 which controls the dynamic reducer 120 to generate a control force Fc having the same magnitude and opposite phase as the excitation force Ft. )Wow; It is composed of a feedback controller (Feed Back Controller) 132 for removing the force (Fd) of the disturbance component distinguished from the excitation force (Ft) and the control force (Fc).

The controller 130 generates a signal for controlling the copper reducer 120 based on a signal measured from the sensor 140 that detects vibration or excitation force Ft of the vehicle body.

As described above, an embodiment of the present invention is to reduce the vehicle body vibration and the indoor noise generated by the vibration reduction target system 110, and active vibration of a vehicle capable of simultaneously controlling a wideband frequency component instead of one frequency component. It relates to a control device.

The vehicle body vibration and the indoor noise generation path due to the vibration of the vibration reduction target system 110 are as follows.

Vibration of vibration reduction target system 110 ⇒ Mount bracket of vibration reduction target system 110 ⇒ Mount of vibration reduction target system 110 ⇒ Body side mounting bracket 210 ⇒ Body ⇒ Body vibration and room noise

That is, the excitation force (Ft) according to the vibration of the vibration reduction target system 110 is excited by the vehicle body side mounting bracket 210 through the mount of the vibration reduction target system 110 to generate vehicle body vibration and room noise.

As described above, the vehicle body vibration generated by the excitation force Ft of the vibration reduction target system 110 is reduced by the control force Fc having the same magnitude as the excitation force Ft and the opposite phase.

For example, when the counter-force (control force Fc) equal to the transmission force (vibration force Ft) through the engine mount is applied to the vehicle-side mount bracket 210, the vehicle-side mount bracket 210 receives. The net force is reduced, greatly reducing body vibration and room noise.

The basic principle of generating the control force Fc of the copper reducer 120 according to the embodiment of the present invention is to use the inertial repulsive force of the moving mass 124 moving by the electromagnetic force as shown in FIGS. 1 and 2.

Referring to FIG. 1, when the dynamic reducer 120 configured as an electromagnetic system applies an electromagnetic force to the mass m, an inertial force F of the mass m is generated. The inertial force F is inertia to the dynamic reducer 120. It acts as a repulsive force to apply a control force (Fc) to the vibration reduction target system 110 coupled with the copper reducer (120).

The control force Fc cancels the vibration by reducing the excitation force Ft acting on the vibration reduction target system 110 during operation.

2 to 5 will be described the operation of the copper reducer 120 according to an embodiment of the present invention.

First, as shown in FIG. 2, when a current flows through a coil, an electromagnetic force attracting the moving mass 124 is generated.

For example, if the currents I1 and I2 flowing through the two coils of the electromagnet portions 122 and 123 are the same, the magnitude of the electromagnetic force generated on both sides of the moving mass 124 is the same, and the moving mass 124 does not move.

However, when the currents I1 and I2 are adjusted to give a difference in the magnitude of the electromagnetic force, the moving mass 124 is driven to generate an inertial force having an arbitrary waveform and frequency characteristics.

Here, the currents I1 and I2 are transmitted from the displacement signal of the moving mass 124 measured by the displacement sensor 126 mounted in the copper reducer 120 and from the sensor 140 installed on the vehicle body to detect vibration of the vehicle body. It is supplied from the controller 130 based on the signal.

As shown in FIG. 5, the control flow for generating the control force Fc has a form in which a feed-forward control and a feed-back control are combined.

In order to generate the control force Fc having the same magnitude and opposite phase as the vehicle body excitation force Ft due to the vibration of the vibration reduction target system 110, the dynamic reducer 120 is controlled by feed forward control, Feedback control is performed to eliminate the influence of the force Fd of the disturbance component.

As described above, the active vibration control device for a vehicle according to the present invention effectively controls the force of disturbance components such as the excitation force and road excitation of the vibration reduction target system in which several frequency components occur at the same time, thereby reducing body vibration and indoor noise. There is.

Claims (6)

In a device for blocking vibration of a specific frequency generated in a vehicle, A vibration reduction target system mounted on the vehicle to generate excitation force (Ft); It is composed of an electromagnetic system is fastened to the vibration reduction target system, the control force (Fc) to the vibration reduction target system to cancel the excitation force (Ft) acting on the vibration reduction target system in accordance with the input of the drive control signal supplied from the outside A copper reducer for applying); And a controller for supplying a driving control signal to the copper reducer to adjust the strength of the control force (Fc) generated from the copper reducer. The method of claim 1, wherein the copper reducer A housing coupled to the vehicle body of the vehicle; An electromagnet portion mounted in the housing and having a coil wound around a core to generate electromagnetic force in both directions; A moving mass for generating a corresponding inertial force according to a difference in electromagnetic force generated from the electromagnet portion; And a guide part for preventing lateral movement of the moving mass in the housing. The method of claim 2, wherein the copper reducer And a displacement sensor for measuring a displacement signal of the moving mass. The method of claim 3, wherein the controller controls the driving of the copper reducer by supplying currents I1 and I2 corresponding to the respective coils based on the vehicle vibration signal measured by the sensor detecting the vibration of the vehicle body. Active vibration control device of a vehicle, characterized in that. The method of claim 4, wherein the controller supplies different intensities of currents I1 and I2 flowing to the respective coils when the excitation force Ft acting on the vibration reduction target system is used to generate an electromagnetic force generated from the electromagnet portion. And the moving mass is driven according to the size to generate an inertial force having a corresponding waveform and frequency characteristic. The method of any one of claims 1 to 5, wherein the controller is A feed forward controller for controlling the dynamic reducer to generate a control force Fc equal in magnitude and opposite in phase to the excitation force Ft; Active feedback control device of the vehicle, characterized in that configured as a feedback controller for removing the force (Fd) of the disturbance component distinguished from the excitation force (Ft) and the control force (Fc).