KR100329059B1 - Apparatus for controlling damping character of shock absorber at vehicle - Google Patents

Abstract

PURPOSE: A damping force adjuster of a shock absorber for a vehicle is provided to improve driving experience by reducing acceleration of the vehicle efficiently with varying a valve through a solenoid, and to enhance steering stability by decreasing reaction to the vehicle. CONSTITUTION: A damping adjusting device of a shock absorber is composed of a first solenoid valve connected to an outlet of a second solenoid valve(12); first and second solenoid valve driving units(22,30) actuating first and second solenoid valves to regulate oil into a main valve corresponding to frequency according to acceleration; a data storage unit(32) storing the gain value of the shock absorber; and a control unit(34) outputting control signals to solenoid valves to adjust the variable range of damping according to frequency and the gain value based on acceleration from an acceleration detecting unit(14). Driving force is improved with reducing acceleration efficiently, and steering stability is improved with reducing reaction.

Description

Damping characteristic control device of shock absorber of vehicle {APPARATUS FOR CONTROLLING DAMPING CHARACTER OF SHOCK ABSORBER AT VEHICLE}

The present invention relates to a damping characteristic control apparatus of a shock absorber of a vehicle, and more particularly, to a damper characteristic of a shock absorber of a vehicle so that the damping characteristic of the shock absorber can be adjusted in real time in a direction of reducing acceleration by sensing an acceleration signal of the vehicle. It relates to a damping characteristic control device of.

As is well known, there are three categories of performance required for automobiles: power performance, steering stability and brake performance. It is important for the car to be "safe and easy to adjust." Actively handle steering such as changing lanes and turning, etc., the convenience and response of control (controlability), and the maintenance of the running course and the impact on the external impact when not actively handling steering such as straight driving and normal turning Applicability (stability) must be compatible.

On the other hand, it can not be said that it is comfortable for passengers unless it blocks various unpleasant vibrations generated when driving on the road and a better riding comfort is not secured. When vibration is applied to the human body in the up and down direction, the human autonomic resonance point is near 5 to 7 Hz, and thus the vibration is most easily felt around the human body. In addition, it is easy to feel the vibration applied to the front and rear, left and right directions at a lower frequency.

Regarding the unevenness of the road surface, it is necessary to alleviate the riding comfort on the deteriorated pavement surface and the impact (hashness) when passing the seam of the concrete road surface or the bridge. As described above, the basic motion of the vehicle is represented by the motion in the up and down direction such as bounce and pitch, the left and right direction of yawing, the forward and backward direction such as the dive and squat. Suspension and steering which are in charge of the movement functions in each of these directions are collectively referred to as a chassis device.

In recent years, suspension control and steering control, which are electronically controlled by combining a high-performance sensor and an actuator with this mechanical mechanism, have been achieved, and a high performance that has not been achieved in the past has been realized.

The damping force control of the shock absorber by electronic control has been devised for the purpose of establishing both the riding comfort, the attitude of the vehicle, and the steering stability, which are opposite characteristics. The electronic control shock absorber damping force control mechanism has different device names for each automobile maker, but the control principle is the same.

In other words, by installing an electric drive valve capable of finely controlling the flow rate of the oil passing through the orifice inside the shock absorber, it is automatically converted according to manual or road surface and driving state to obtain appropriate damping force.

Fig. 1A is a view schematically showing the structure of a damping characteristic adjusting device of a shock absorber of a conventional vehicle, in which reference numeral 1 denotes a cylinder rod 1a side coupled to a vehicle body side and a cylinder 1b lower portion coupled to a wheel side. Is a shock absorber, a reference valve 2 is a check valve (not shown in detail) installed on the lower part of the cylinder 1b and the piston 1c, a reference numeral 4 is an accumulator for performing a shock absorbing function, and a reference numeral 6 is provided therein. The main valve in which the rod 6a, the spring 8, etc. are built, 7 is a hydraulic line through which fluid flows, and 21 is a moving member to which the pressure of the fluid supplied from the Px side acts.

And, as shown in FIG. 1A, the connection structure of the hydraulic line 7 is a hydraulic line in which one side is connected to the upper side of the cylinder 1b of the shock absorber 1, and the other side thereof is the input side P of the main valve 6. And the hydraulic line branched to the discharge side of the valve 10 and connected at one end to the lower part of the cylinder 1b, the accumulator 4 is connected to the other side thereof, and the hydraulic line connected to the accumulator 4 is connected to the main line. It is connected to the outlet S of the valve 6 and the input side of the second solenoid valve 12, while a hydraulic line is connected between the outlet side of the second solenoid valve 12 and the input side of the valve 10. The hydraulic line is connected to the movable member 21 side of the main valve 6.

1b and c are diagrams showing damping characteristics according to solenoid valves employed in the damping characteristic regulating device of the shock absorber 1 of the conventional vehicle, wherein the main valve 6 is predetermined before and after the full load of the spring 8. The damping characteristic of the acceleration sensor is installed on the vehicle body to detect the vertical vibration of the vehicle, and the appropriate damping characteristic is adopted according to the force of MAX and MIN. The damping characteristic is controlled within a variable range of damping, where Fd generally represents a damping force, and ΔV represents a speed change amount of a piston installed in the shock absorber.

That is, in a road (high frequency) with a rough road surface, as shown in FIG. 1A, a large pressure oil is returned by the piston action inside the shock absorber, so that the rod 6a of the main valve 6 moves in the a direction to attenuate it. In order to suppress the flow of the fluid to be returned to the relatively large damping action, on the contrary, on the flat road (low frequency), the rod 6a of the main valve 6 is moved in the b direction to suppress the flow of the returned fluid By means of a relatively small damping action (damping).

At this time, the control of the main valve (6) is adjusted so that the hydraulic pressure acts in the a direction inside the main valve by the second solenoid valve 12 so that the solenoid is configured and variable, the valve 10 is the solenoid Does not consist of a fixed valve is composed of a valve that can not control the hydraulic pressure.

However, according to the damping characteristic adjusting device of the shock absorber of the conventional vehicle, the MIN curve (b-b ') shown in Figure 1c should be lowered in order to improve the ride comfort of the vehicle on a flat road surface. 2 Adjust the solenoid valve 12 in the closing direction so that the hydraulic pressure acting on the rod of the main valve is weakened, so that the damping force increases because the valve 10 is a fixed valve rather than a variable valve (a direction in FIG. 1A). Since the hydraulic pressure acting as a weakening occurs and the MAX curve is simultaneously lowered, the second solenoid valve 12 is opened when the high frequency (poor road state) signal is applied to the valve 10 even if a large hydraulic pressure is applied. ) Is a fixed valve, it is difficult to expect an improvement in ride comfort due to a weak damping action as the hydraulic pressure lost to the inside of the main valve is lost as the fluid is discharged. Is life.

Accordingly, the present invention has been made in view of the above circumstances, and provides a damping characteristic adjusting device for a shock absorber of a vehicle which detects a frequency of an acceleration signal of the vehicle so that the damping characteristic of the shock absorber can be adjusted in real time. There is a purpose.

According to an embodiment of the present invention for carrying out the above object, the cylinder is coupled to the wheel side, the hydraulic pressure absorber coupled to the cylinder body side, the inlet side is connected to the hydraulic line connected to the cylinder upper side A spring is installed on the other side of the rod which is installed inside the body, and the moving member is installed in contact with the spring, and connected to the main valve having a discharge port on the body corresponding to the tip of the rod, and a hydraulic line connected to the lower part of the cylinder. Accumulator, a second solenoid valve connected to the accumulator and connected to a hydraulic line branched to the outlet side of the main valve, and a hydraulic line branched to the moving member side of the main valve connected to the discharge side of the second solenoid valve. Is connected to the input side, and the discharge side is connected to the upper side of the cylinder, and the acceleration of the road surface In a shock absorber device for a vehicle including an acceleration detection unit configured to detect a solution frequency, a valve connected to the discharge side of the second solenoid valve is configured as a first solenoid valve, and is detected by the acceleration detection unit. The first and second solenoid valve driving units driving the first and second solenoid valves to control the inflow of oil into the main valve in response to the frequency according to the acceleration of the vehicle, and the vehicle sensed by the acceleration sensing unit. The data storage unit stores the gain value of the shock absorber corresponding to the frequency according to the acceleration, and calculates the frequency according to the acceleration of the vehicle detected by the acceleration detection unit, and calculates a corresponding gain value from the data storage unit. By reading and calculating, based on the result value of the vehicle detected by the acceleration sensing unit When the frequency according to the figure is a high frequency, the first and second solenoid valves are operated to move the rod in the a direction so that the upper limit of the damping variable range of the shock absorber is upwardly adjusted, and when the frequency is low, the shock absorber is operated. And a control unit for generating a control signal for operating the first and second solenoid valves so that the rod moves in the b direction so that the lower limit of the damping variable range of the pump is downwardly adjusted and applied to the first and second solenoid valve driving units. Provided is a damping characteristic control apparatus for a shock absorber of a vehicle.

According to the present invention having the above-described configuration, all the valves configured on the shock absorber of the vehicle can be changed by the solenoid so that the damping characteristics are adjusted in real time, thereby improving the riding comfort of the vehicle.

1A is a view schematically showing a configuration of a damping characteristic adjusting apparatus for a shock absorber of a conventional vehicle;

Figure 1b and c is a view showing the damping characteristics according to the solenoid valve employed in the damping characteristics adjusting device of the shock absorber of the conventional vehicle,

2 is a view schematically showing the configuration of a damping characteristic control apparatus for a shock absorber of a vehicle according to an embodiment of the present invention;

3 is a block diagram showing a damping characteristic control device of a shock absorber of a vehicle according to an embodiment of the present invention;

4A is a diagram illustrating an acceleration signal of a vehicle, an instantaneous frequency corresponding thereto, and a gain value corresponding to the frequency.

Figure 4b and c is a view showing a change in the damping characteristics according to the control of the solenoid valve in the damping characteristic control device of the shock absorber of the vehicle according to an embodiment of the present invention.

* Setting of symbols for the main parts of drawings

2: check valve. 4: Accumulator.

6: Main valve. 8: spring.

10: fixed valve. 11: First solenoid valve.

12: Second solenoid valve. 14: acceleration detection unit.

16, 18, 20: first switching unit. 22: First solenoid valve drive unit.

24, 26, 28: second switching unit. 30: 2nd solenoid valve drive part.

32: data storage. 34: control unit.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the present invention.

First, FIG. 2 is a view schematically showing a configuration of a damping characteristic adjusting device for a shock absorber of a vehicle according to an embodiment of the present invention, but has a configuration substantially similar to that of the damping characteristic adjusting device of the conventional vehicle shock absorber. The first solenoid valve 11 is additionally configured to remove the valve 10 which is not composed of the conventional solenoid and to control the damping characteristics by the control of the solenoid, so that the shock absorber is elastically absorbed according to the frequency generated on the road surface. It is configured to be able to adjust the damping characteristics of.

3 is a block diagram illustrating a damping characteristic control apparatus for a shock absorber of a vehicle according to an exemplary embodiment of the present invention, and FIG. 4A is a diagram illustrating an acceleration signal of a vehicle, an instantaneous frequency corresponding thereto, and a gain value corresponding to the frequency. In Fig. 4b and c show the gain value of the damping characteristic control device of the shock absorber corresponding to the frequency generated on the road surface, Figure 4b and c control the solenoid valve in the damping characteristic control device of the shock absorber of the vehicle according to an embodiment of the present invention A diagram showing a change in damping characteristics with

Here, FIG. 4B shows an example of adjusting the limit damping characteristic of a rough road with a lot of high frequencies (3-8 Hz), and FIG. 4C shows an example of adjusting the limit damping characteristic of a road for improving ride comfort on a flat road with many low frequencies. Drawing.

In FIG. 3, reference numeral 14 denotes an acceleration detecting unit configured to detect a acceleration (acceleration in up and down direction) of a vehicle, which is configured at a predetermined portion of the vehicle chassis.

Further, reference numerals 16, 18, and 20 are applied to the control signal of the control unit 34 to be described later, the main valve of the shock absorber according to the application of the frequency corresponding to the acceleration of the acceleration sensing unit 14 to the shock absorber of the vehicle. A first switching unit which performs a switching operation for driving the first solenoid valve 11 described later so that 6 can be driven.

In addition, the reference numeral 22 is applied to the control signal of the control unit 34 to be described later the main valve 6 can be driven in accordance with the application of the frequency corresponding to the acceleration of the acceleration sensing unit 14 to the shock absorber of the vehicle. The first solenoid driving part for driving the first solenoid valve 11 is shown.

In addition, reference numerals 24, 26, and 28 are used to apply a predetermined control signal from the controller 34 to be described later, such as the first switching units 16, 18, and 20, to apply battery power of the vehicle to the subsequent stage. 2 shows a switching part.

In addition, the reference numeral 30 is applied to the control signal of the control unit 34 to be described later the main valve 6 may be driven in accordance with the application of the frequency corresponding to the acceleration of the acceleration sensing unit 14 to the shock absorber of the vehicle. The second solenoid driving unit which drives the second solenoid valve 12 is shown.

Also, reference numeral 32 denotes an instantaneous frequency calculated by the acceleration of the vehicle with respect to the road surface detected by the acceleration sensing unit 14 and a gain value corresponding to the frequency so as to control the first sole and the second solenoid. 4b and 4c show a data storage unit which is stored as data corresponding to the frequency to enable damping adjustment of the shock absorber.

In addition, reference numeral 34 is applied to the acceleration of the vehicle on the road surface detected by the acceleration detection unit 14 to calculate the instantaneous frequency corresponding to the damping control of the shock absorber from the data storage unit 32 is possible. The control unit reads data on adjustment values of the first and second solenoid valves 11 and 12 and generates control signals to the first and second solenoid valve driving units 22 and 30.

Hereinafter, the operation of the damping characteristic control device of the shock absorber of the vehicle according to the present invention of the above configuration will be described in detail.

First, when an acceleration of the vehicle sensed by the acceleration sensing unit 14 is applied to the control unit 34, the control unit 34 calculates the acceleration signal at an instantaneous frequency corresponding thereto and a gain value corresponding to the frequency. The data is read by the data storage unit 32 to multiply the frequency of the vehicle with respect to the road surface and the gain value at that time.

Subsequently, the control unit 34 controls the relay switches of the first switching units 16, 18, 20 and the second switching units 24, 26, 28 based on the operation value calculated by the control unit 34. 20 and 28 are switched on to apply control signals to the first solenoid valve driver 22 and the second solenoid valve driver 30 so that the first and second solenoid valves 11 and 12 While driving, the damping characteristics of the shock absorber can be adjusted according to the frequency generated on the road surface.

Here, the second solenoid valve 12 is independently calculated according to the value calculated by the control unit 34, the first solenoid valve 11 is the acceleration of the vehicle body acceleration signal detected by the acceleration sensor (11) The controller 34 is controlled by the control unit 34 according to the gain value corresponding to the instantaneous frequency.

That is, when a frequency of a rough road having a high frequency of the acceleration calculated by the acceleration detector 14 as an instantaneous frequency is generated, the controller 34 may determine a gain value corresponding thereto. As shown in FIG. 4B, the first solenoid valve 11 is controlled so that the MAX curve can be adjusted upward by reading and multiplying the data from the data storage unit 32, for example, when the vehicle runs on a rough road surface. When a high frequency signal is applied from the acceleration sensing unit 14 while the second solenoid valve 12 is opened according to the value calculated by the control unit 24, the first solenoid valve 11 according to the control signal of the control unit 24. ) And the fluid passing through the second solenoid valve 12 is not discharged to the first solenoid valve 11 and is supplied into the main valve 6 to move the movable member 21 in the a direction. Since the rod 6a is moved to the P side by the pressing force of the spring 8 and is returned from the shock absorber 1 side to the P side, a large damping force is applied as the flow path to be introduced to the main valve 6 side is reduced, so that FIG. Damping action is raised as indicated by the dotted line.

On the other hand, when a frequency generated on the flat road with many low frequencies is calculated as the instantaneous frequency of the acceleration detected by the acceleration detecting unit 14, the control unit 34 calculates a corresponding gain value. As shown in FIG. 4C, the first and second solenoid valves 11 and 12 are controlled to read and multiply by reading from the data storage unit 32 to improve the ride comfort of the vehicle. For example, when the vehicle travels on a flat road surface, the low frequency signal is applied from the acceleration sensing unit 14 in the state in which the second solenoid valve 12 is opened according to the value calculated by the controller 24. When the first solenoid valve 11 is opened in a predetermined state according to the control signal of the controller 24, the fluid passing through the second solenoid valve 12 is discharged to the first solenoid valve 11 side. As it moves while the fluid is returned from the shock absorber 1 side to the P side, the damping action is reduced as indicated by the dotted line in FIG. That is, the damping characteristics are improved by the action of the first solenoid valve controlled by the control unit 34 in addition to the conventional second solenoid valve 12.

On the other hand, the damping characteristic control device of the shock absorber of the vehicle according to the present invention can be applied to the shock absorber of the transportation means, such as aircraft, prime mover, etc. without departing from the spirit and spirit of the invention.

As described above, according to the damping characteristic adjusting device of the shock absorber of the vehicle according to the present invention, the valves configured on the shock absorber of the vehicle can be changed by the solenoid to effectively reduce the acceleration applied to the vehicle and thereby Not only is the ride quality improved, but the reaction to the vehicle is reduced and the handling characteristics are also improved.

Claims (1)

It is installed inside the body in which the lower part of the cylinder 1b is coupled to the wheel side and the cylinder pressure absorber 1 is coupled to the vehicle body side, and the inflow side is connected to the hydraulic line connected to the upper side of the cylinder 1b. A spring 8 is installed on the other side of the rod 6a, and the main valve 6 has a discharge port S formed on the body corresponding to the front end of the rod 6a, while the movable member 21 is installed in contact with the spring. ), An accumulator 4 connected to the hydraulic line connected to the lower part of the cylinder 1b, and a second hydraulic line connected to the accumulator and connected to the hydraulic line branched to the outlet S side of the main valve 6. The input side is connected to the solenoid valve 12 and the hydraulic line connected to the discharge side of the second solenoid valve 12 and branched to the moving member 21 side of the main valve 6, so that the discharge side is connected to the cylinder 1b. Frequency by the acceleration of the valve connected to the upper side of the Including acceleration field guide part 14 configured to detect in the shock absorber device for a vehicle is configured, The valve connected to the discharge side of the second solenoid valve 12 is composed of a first solenoid valve, The first and second solenoid valve drivers for driving the first and second solenoid valves to control the inflow of oil into the main valve in response to the frequency according to the acceleration of the vehicle sensed by the acceleration sensing unit 14. (22,30), A data storage unit 32 in which a gain value of the shock absorber corresponding to a frequency according to the acceleration of the vehicle sensed by the acceleration detection unit 14 is stored; The acceleration detection unit 14 calculates a frequency according to the acceleration of the vehicle sensed by the acceleration detection unit 14, and calculates a gain value corresponding to the acceleration value by reading the data storage unit 32. When the frequency according to the sensed acceleration of the vehicle is a high frequency, the first and second solenoid valves 12 and 11 move the rod 6a in a direction so that the upper limit of the damping variable range of the shock absorber can be adjusted upward. When the frequency is cursed, the first and second solenoid valves 12 and 11 are operated to move the rod 6a in the b direction so that the lower limit of the damping variable range of the shock absorber can be adjusted downward. And a control unit (34) for generating a control signal to be applied to the first and second solenoid valve driving units (22, 30).

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