KR101897071B1 - Wheel suspension system capable of energy regeneration and suspension control - Google Patents

Abstract

The wheel suspension system 1 capable of energy regeneration and active suspension control according to the present invention includes a damper 20 and the damper 20 is disposed so as to be movable up and down in the case 22, A filled cylinder 24; A hydraulic piston (32) closely fitted to slide on the inner wall of the cylinder (24) and formed with at least one orifice (36); A piston rod (38) axially extending from one surface of the hydraulic piston (32); A coil 46 and a permanent magnet 44 that are electromagnetically coupled to one of the case 22 and the cylinder 24 and are electromagnetically coupled; And a disk 50 disposed in the hydraulic piston 32 and rotated by a motor 56 and having at least one through hole 52 formed therein. The wheel suspension system 1 according to the present invention may further include an electronic control unit 60 for controlling the opening degree of the orifice 36 by rotating the disk 50.

Description

WHEEL SUSPENSION SYSTEM CAPABLE OF ENERGY REGENERATION AND SUSPENSION CONTROL BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel suspension system, and more particularly, to a wheel suspension system capable of energy regeneration and suspension control by regulating the opening degree of an orifice in a hydraulic damper to enable energy regeneration and suspension control.

In the suspension of the vehicle, a large load is applied from the road surface during driving, and the vehicle body vibrates, and such vibration is converted into heat from a shock absorber and is emitted to the atmosphere. Various methods have been devised to regenerate such divergent energy into electrical energy, and patent applications and registrations have been made, but they have been difficult to put into practical use.

Prior Art United States Patent Application Publication No. US20130154281 A1 discloses an integrated energy generation damper. 1, when the piston 140 moves downward, the compressed hydraulic fluid 142 flows through the first port 148 to rotate the gerotor 16, and the second port 149 Pressure portion 145 through the through-hole (not shown). At this time, the generator 18 directly connected to the gerotor 16 rotates to generate electricity.

In the preceding literature, one hydraulic motor performs shock absorption (electricity production) and active control (electricity consumption) functions, so regenerative function and active control function can not operate at the same time, and there is a difficulty in smooth conversion between them. In addition, the number of gear teeth of the gerotor is small and pressure pulsation is serious and vibration is likely to occur.

Accordingly, there is a need for a suspension system that can regenerate the body vibration energy generated during traveling in a more easily operated manner and maintain the posture more stably by acting as an active damper when the vehicle performs a behavior such as cornering or braking.

U.S. Patent Application Laid-Open Publication No. US 20130154281 A1 (Published date: June 3, 2013)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide a vehicular electric vehicle in which the energy that the vehicle body vibrates up and down by a load acting on a suspension from a road surface during a vehicle running is regenerated and stored as electric energy, And to provide a suspension system that can improve the performance of the suspension system.

It is also an object of the present invention to provide a suspension system capable of rapidly reducing the impact of suspension and attitude control function to improve both the electric regeneration and the ride comfort.

 The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned may be clearly understood by those skilled in the art from the following description.

The features of the present invention for achieving the objects of the present invention as described above and performing the characteristic functions of the present invention described below are as follows.

A wheel suspension system capable of energy regeneration and active suspension control according to the present invention includes a damper, the damper including: a cylinder filled with a fluid; A hydraulic piston closely attached to the inner wall of the cylinder for sliding movement and having at least one orifice formed therein; A piston rod axially extending from one surface of the hydraulic piston; Coils and permanent magnets electromagnetically coupled to one of the case and the cylinder and electromagnetically coupled; And a disk disposed in the hydraulic piston and rotated by the motor and having at least one through hole formed therein.

The wheel suspension system according to the present invention may further include an electronic control unit for controlling the opening degree of the orifice by rotating the disk.

As described above, according to the present invention, the vehicle body vibration energy generated during traveling is regenerated into electricity, and when the vehicle performs a behavior such as cornering or braking, it acts as an active damper to stably maintain the posture, can do.

In addition, according to the present invention, there is provided a suspension system that provides an optimum ride comfort through energy saving effect and attitude control of a vehicle.

Figure 1 shows a prior art,
Figure 2 shows a schematic diagram of a wheel suspension system according to the invention,
3 shows a sectional view of a damper of a wheel suspension system according to the present invention,
Figure 4 illustrates a disc formed in a hydraulic piston according to one embodiment of the present invention,
FIG. 5A shows an orifice of a hydraulic piston closed according to an embodiment of the present invention,
Figure 5b illustrates a partially or partially closed orifice of a hydraulic piston in accordance with an embodiment of the present invention,
FIG. 5C shows a state in which the orifices of the hydraulic pistons are all opened according to an embodiment of the present invention.
6 shows an exemplary diagram of the operation of the electronic control unit according to an embodiment of the present invention,
FIG. 7 illustrates an operating mode of the electronic control unit according to an embodiment of the present invention.

The specific structure or functional description presented in the embodiment of the present invention is merely illustrative for the purpose of illustrating an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention can be implemented in various forms. Also, it should be understood that the present invention should not be construed as limited to the embodiments described herein, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.

Meanwhile, in the present invention, the terms first and / or second etc. may be used to describe various components, but the components are not limited to the terms. The terms may be referred to as a second element only for the purpose of distinguishing one element from another, for example, to the extent that it does not depart from the scope of the invention in accordance with the concept of the present invention, Similarly, the second component may also be referred to as the first component.

Whenever an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but it should be understood that other elements may be present in between something to do. On the other hand, when it is mentioned that an element is "directly connected" or "directly contacted" to another element, it should be understood that there are no other elements in between. Other expressions for describing the relationship between components, such as "between" and "between" or "adjacent to" and "directly adjacent to" should also be interpreted.

Like reference numerals designate like elements throughout the specification. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising ", as used herein, unless the recited element, step, operation, and / Or additions.

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

3 and 4, the wheel suspension system 1 capable of energy regeneration and active suspension control according to the present invention includes a damper 20, and the damper 20 is disposed in the case 22 A cylinder (24) arranged to be movable up and down and filled with a fluid (30); A hydraulic piston (32) closely fitted to slide on the inner wall of the cylinder (24) and formed with at least one orifice (36); A piston rod (38) axially extending from one surface of the hydraulic piston (32); A coil 46 and a permanent magnet 44 that are electromagnetically coupled to one of the case 22 and the cylinder 24 and are electromagnetically coupled; And a disk 50 disposed in the hydraulic piston 32 and rotated by a motor 56 and having at least one through hole 52 formed therein.

As shown in FIG. 2, the wheel suspension system 1 capable of energy recovery and active suspension control according to an embodiment of the present invention may further include a spring 10. The damper 20 can be fixed to the vehicle body side through the bracket 102 and can be mounted to the wheel side through the wheel fixing portion 104.

3, the damper 20 according to the present invention includes a cylinder 24 disposed in the case 22 so as to be movable up and down and filled with the fluid 30; A hydraulic piston (32) closely fitted to slide on the inner wall of the cylinder (24) and formed with at least one orifice (36); And a piston rod (38) extending axially on one side of the hydraulic piston (32). The piston 42 disposed below the hydraulic piston 32 in the cylinder 24 and the compressed air 40 filled between the piston 42 and the wall of the cylinder 24 when the damper is of the single- . Although only the single damper is shown in the drawing, the damper 20 according to the present invention may be a double damper or a triple damper.

The damper 20 also includes a permanent magnet 44 and a coil 46 that are electromagnetically coupled to either of the case 22 and the cylinder 24 and are electromagnetically coupled. For example, when the permanent magnet 44 is disposed on the case 22, more preferably on the inner wall of the case 22, the coil 46 is mounted on the cylinder 24, more preferably on the outer wall of the cylinder 24 . Conversely, when the permanent magnet 44 is disposed on the cylinder 24, more preferably on the outer wall of the cylinder 24, the coil 46 is disposed on the case 22, more preferably on the inner wall of the case. This is similar to the principle in which a cylindrical coil moves axially in an air gap formed between a cylindrical coil and a permanent magnet surrounding the coil, as in a linear voice coil actuator. In addition, the present invention may further include a battery 48 for storing the generated current.

The damper 20 may further include a disc 50 disposed in the hydraulic piston 32 and driven by the motor 56 to rotate and have at least one through hole 52 formed on the surface thereof. According to one embodiment of the present invention, the disk 50 is connected to the motor 56 by a drive shaft 54 disposed inside the piston rod 38 so that the rotation can be adjusted. The distance from the center of the disk 50 to the through hole 52 and the distance from the center of the hydraulic piston 32 to the orifice 36 can be made to coincide with each other. The distance from the center of the disk 50 to the center of at least one through hole 52 formed in the disk 50 and the distance from the center of the hydraulic piston 32 to the center of the orifice 36 are matched . Thereby, as shown in Fig. 4, one or more through-holes 52 of the disk 50 and the orifices 36 of the hydraulic piston 32 can be configured to be in fluid communication when superimposed.

6, the wheel suspension system 1 according to the present invention may further include an electronic control unit 60. [ The electronic control unit 60 exchanges various signals with the components of the suspension.

The electronic control unit 60 can also control the opening of one or more orifices 36 through which the fluid passes. The electronic control unit 60 can control the degree of opening of the orifice 36 of the hydraulic piston 32 to control the amount of fluid passing through the orifice 36. For example, the opening of the at least one orifice 36 can be controlled by rotating the disk 50 formed within the hydraulic piston 32. The center of the through hole 52 formed in the disk 50 is moved with respect to the center of the orifice 36 so that the center of the through hole 52 formed in the disk 50 coincides with the center of the orifice 36 The opening degree of the orifice 36 can be controlled. 5A to 5C show an example in which the opening degree of the orifice is changed. The amount of the fluid 30 flowing through the orifice 36 can be changed in accordance with the change in the degree of opening of the orifice 36. [ Although four circular through holes and orifices are shown in the figure, it should be understood that this is merely an example, and that fewer or greater numbers of through holes and orifices may be formed in different shapes.

 According to another embodiment of the present invention, a disc of the same size as the orifice 36 is disposed inside the hydraulic piston 32 so as to coincide with the center of the orifice 36, and the disc is rotated by 360 degrees The opening degree of the orifice 36 is also adjusted. In this case, it is preferable that the number of orifices and the number of through holes are formed to be the same. It should also be understood that, although not directly described herein, it is within the scope of the present invention to regulate the flow of fluid by adjusting the opening of the orifice using a disc in a different way.

The electronic control unit 60 can also control the opening degree of the orifice so that the suspension system 1 operates in various modes to be described later.

As shown in Fig. 7, the electronic control unit 60 can control the opening degree of the orifice 36 to control the wheel suspension system 1 to operate in the energy regeneration mode. When the electronic control unit 60 rotates the disk 50 to completely close the orifice 36, the body vibration energy, which is the energy that the vehicle body vibrates up and down due to the load acting on the suspension from the road surface when the vehicle is traveling, do. Specifically, the cylinder 24 moves up and down to induce a current in the coil 46, which is stored in a battery or the like to realize a regenerative function. Further, when the orifice 36 is opened, a part of the body vibration energy is regenerated into electric energy by the coil, and the rest is converted into heat by the damping force.

 7, the electronic control unit 60 also controls the opening degree of the orifice 36 so as to operate in a damping force adjusting mode for adjusting the damping force of the wheel suspension system 1 . The damping force is generated in proportion to the speed of the fluid passing through the orifices as the hydraulic piston moves up and down, and the damping force is changed according to the total area, that is, the number and size of the orifices. The damping force can be varied to obtain the required damping force by rotating the formed disc by a predetermined angle to adjust the degree of opening of the orifice. At this time, by regulating the opening degree of the orifice, part of the body vibration energy is converted into heat by the damping force and the remainder is regenerated by the coil.

7, the electronic control unit 60 can control the opening degree of the orifice 36 to operate in the active suspension mode in which the wheel suspension system 1 performs the active suspension function. The orifice is fully closed and the regenerated electric power is applied to the coil to perform the active suspension function capable of controlling the garage. In the active suspension mode, when active suspension control is required, such as when a roll or pitch control of the vehicle is required or when the height of the vehicle body is required, the orifice 36 is completely closed and the regenerated electric energy is applied to the coil To implement an active suspension function that adjusts the height of the vehicle body.

As described above, the wheel suspension system according to the present invention can regulate the electric energy, adjust the damping force, and realize the active suspension function through the simple adjustment of the orifice opening degree, thereby achieving optimum ride comfort and power regeneration .

The wheel suspension system 1 according to the present invention may also include various sensors for sensing traveling and road surface information and exchanging signals with the electronic control unit 60. For example, traveling information is collected by a vehicle speed sensor, a brake sensor, a three-axis acceleration (x, y, z) sensor, a steering angle sensor, a height sensor or a vehicle horizontal posture sensor, pot holes, bumps, road pavement, and so on.

The traveling and road surface information is transmitted to the electronic control unit 60. The electronic control unit 60 automatically selects one of the energy regeneration mode, the active suspension mode, and the damping force control mode based on at least one of the traveling information and the road surface information Controls the suspension to work in the most appropriate mode. In addition, the driver can selectively cause the suspension to operate in a specific mode based on at least one of the collected driving and road surface information.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

1: wheel suspension system 10: spring
20: damper 22: case
24: cylinder 30: fluid
32: Hydraulic piston 36: Orifice
38: Piston rod 40: Compressed air
42: piston 44: permanent magnet
46: Coil 48: Battery
50: disk 52: through hole
54: drive shaft 56: motor
102: Bracket 104: Wheel fixing part

Claims (8)

delete delete 1. A wheel suspension system capable of energy recovery and active suspension control including a single damper (20), wherein the damper (20)
A cylinder (24) arranged to be movable up and down in a case (22) and filled with a fluid (30);
A hydraulic piston (32) closely disposed to slide on an inner wall of the cylinder (24) and having at least one orifice (36) formed therein;
A piston rod (38) extending axially on one surface of the hydraulic piston (32);
A permanent magnet (44) and a coil (46) that are electromagnetically coupled to one of the case (22) and the cylinder (24) and are electromagnetically coupled;
A disk 50 disposed in the hydraulic piston 32 and rotated by a motor and having at least one through hole 52 formed therein; And
And an electronic control unit (60) for controlling the opening degree of the orifice (36) by rotating the disk (50)
The electronic control unit (60)
The wheel suspension system is operated in the energy recovery mode in which the body vibration energy is stored as electric energy by adjusting the opening degree of the orifice 36. The orifice 36 is closed and the electric energy is applied to the coil, In the active suspension mode, which performs the active suspension function to control the wheel suspension system,
Wherein the energy recovery mode or the active suspension mode is automatically executed based on at least one of the sensed driving information and road surface information.


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