Electromagnetic quasi-zero stiffness air suspension and automobile

Abstract

The present invention discloses an electromagnetic quasi-zero stiffness air suspension and a car, belonging to the technical field of automobile suspension, including an air spring mechanism and an electromagnetic spring mechanism, the top and bottom of the air spring mechanism and the electromagnetic spring mechanism are respectively provided with an upper cover plate and a lower bottom plate, and two electromagnetic spring mechanisms are symmetrically provided on both sides of the air spring mechanism; the two electromagnetic spring mechanisms are negative stiffness springs, and the air spring mechanism is a positive stiffness spring, which are arranged in parallel between the upper cover plate and the lower bottom plate to form a quasi-zero stiffness air suspension; the restoring force generated by the air spring during expansion and contraction is offset by adjusting the height of the electromagnetic spring mechanism to achieve quasi-zero stiffness. The present invention has a simple structure and is easy to operate, and can achieve quasi-zero stiffness in a large range. At the same time, when the dynamic deflection of the suspension is too large, the electromagnetic spring mechanism can stop participating in the work, reducing the probability of the suspension hitting the limit block; and it is not affected by the change of the static balance position of the suspension due to the change of the sprung mass of the air spring.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile suspension, and in particular relates to an electromagnetic quasi-zero stiffness air suspension and an automobile. Background Art

[0002] With the increase in the number of cars, people have put forward higher requirements for the ride comfort and driving smoothness of cars, which requires further improvement of suspension performance.

[0003] Automobile suspension plays a vital role in optimizing the vertical vibration performance of the vehicle body, reducing the force transmitted to the human body by the road surface, and improving the ride comfort and driving smoothness of the vehicle. The air spring has a low natural frequency, and the low stiffness of the suspension can greatly reduce the force transmission rate, thereby optimizing the vertical performance of the suspension. However, a low stiffness suspension will greatly reduce the static load-bearing capacity of the vehicle, so "high static and low dynamic" is the ideal suspension performance.

[0004] Based on this, the quasi-zero stiffness suspension has the rational characteristics of "high static and low dynamic". Common quasi-zero stiffness suspensions include coil springs, pneumatic, gear racks, etc. However, these suspensions have the defects of complex structure and small adjustment range. At the same time, when the sprung mass of the suspension spring changes, it is necessary to adjust the new balance position, which is not conducive to the application of automobile suspension. And due to the limitation of the suspension dynamic travel, the suspension needs a large stiffness at large dynamic deflection to prevent exceeding the suspension dynamic travel range, but negative stiffness will still exist, which greatly increases the probability of the suspension hitting the limit block. Summary of the invention

[0005] The purpose of the present invention is to provide an electromagnetic quasi-zero stiffness air suspension and a car, aiming to solve the technical problems of the prior art quasi-zero stiffness suspension having a complex structure, a small adjustment range, cumbersome operation, and a high risk of collision with a limit block.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] An electromagnetic quasi-zero stiffness air suspension comprises an air spring mechanism and an electromagnetic spring mechanism, wherein an upper cover plate is arranged on the top of the air spring mechanism and the electromagnetic spring mechanism, a lower base plate is arranged on the bottom of the air spring mechanism and the electromagnetic spring mechanism, and two electromagnetic spring mechanisms are symmetrically arranged on both sides of the air spring mechanism; the two electromagnetic spring mechanisms are negative stiffness springs, and the air spring mechanism is a positive stiffness spring, which are arranged in parallel between the upper cover plate and the lower base plate to form a quasi-zero stiffness air suspension; the quasi-zero stiffness is achieved by adjusting the height of the electromagnetic spring mechanism to offset the restoring force generated by the air spring during extension and contraction.

[0008] Furthermore, when the suspension is stationary, the electromagnetic spring mechanism is not energized, and only the air spring mechanism plays a supporting role, which is static high stiffness; when the suspension vibrates, the electromagnetic spring mechanism is energized to adjust its height to offset the restoring force generated by the air spring mechanism during compression or stretching, thereby achieving quasi-zero stiffness, which is dynamic low stiffness.

[0009] Preferably, the electromagnetic spring mechanism is a diamond-shaped electromagnetic spring, comprising four frames and a telescopic frame, wherein the telescopic frame is a telescopic structure and is arranged inside a frame composed of four frames, and the four connecting ends of the telescopic frame are respectively rotatably connected to the inner sides of the four frames; the four frames are respectively plates I, II, III and IV, which are rotatably connected head to tail in sequence, and electromagnets I and II are respectively provided on the opposite sides of plates I and III, and permanent magnets I and II are respectively provided on the opposite sides of plates II and IV, and the magnetic poles of the opposite sides of permanent magnets I and II are opposite; the four connecting ends of the telescopic frame are respectively rotatably connected to the middle parts of the four frames; the magnetic field strength and magnetic poles of electromagnets I and II are adjusted by changing the magnitude and direction of the current in the energized coils of electromagnets I and II, thereby adjusting the stiffness of the diamond-shaped electromagnetic spring.

[0010] Preferably, the telescopic frame includes a telescopic magnetic isolation plate I and a telescopic magnetic isolation plate II, the middle parts of the telescopic magnetic isolation plate I and the telescopic magnetic isolation plate II are rotatably connected, and both ends of the telescopic magnetic isolation plate I and the telescopic magnetic isolation plate II are telescopic connecting ends; the two connecting ends of the telescopic magnetic isolation plate I are respectively rotatably connected to the middle parts of plate I and plate III, and the two connecting ends of the telescopic magnetic isolation plate II are respectively rotatably connected to the middle parts of plate II and plate IV.

[0011] Preferably, the plate I and plate IV are rotationally connected via shaft I, the plate I and plate II are rotationally connected via shaft II, the plate II and plate III are rotationally connected via shaft III, and the plate III and plate IV are rotationally connected via shaft IV; the two connecting ends of the retractable magnetic isolation plate I are rotationally connected to plate I and plate III via shaft V and shaft VII respectively, the two connecting ends of the retractable magnetic isolation plate II are rotationally connected to plate II and plate IV via shaft VI and shaft VIII respectively, the middle parts of the retractable magnetic isolation plate I and retractable magnetic isolation plate II are rotationally connected via shaft IX; the shaft I is connected to the upper cover plate, and the shaft III is connected to the lower base plate.

[0012] Preferably, the plates I, II, III and IV are each provided with an installation groove on the inner side, the electromagnet I and the electromagnet II are correspondingly arranged in the installation grooves of the plates I and III, and the permanent magnet I and the permanent magnet II are correspondingly arranged in the installation grooves of the plates II and IV.

[0013] Preferably, the four frames of the diamond-shaped electromagnetic spring and the internal telescopic frame are all made of non-magnetic or weakly magnetic materials.

[0014] Preferably, the permanent magnet I and the permanent magnet II are both made of neodymium iron boron material.

[0015] Preferably, the air spring mechanism is a membrane type air spring, the upper end of the membrane type air spring is connected to the upper cover plate, and the lower end of the membrane type air spring is connected to the lower base plate via a base.

[0016] The present invention also provides an automobile, comprising the electromagnetic quasi-zero stiffness air suspension.

[0017] The beneficial effects of the above technical solution are as follows: Compared with the prior art, the present invention installs an air spring mechanism and an electromagnetic spring mechanism between the upper cover plate and the lower base plate, and two electromagnetic spring mechanisms with negative stiffness are symmetrically arranged on both sides of the air spring mechanism with positive stiffness to form a quasi-zero stiffness air suspension; the restoring force generated by the air spring during expansion and contraction is offset by adjusting the height of the electromagnetic spring mechanism to achieve quasi-zero stiffness. The present invention has a simple structure and is easy to operate, and can achieve quasi-zero stiffness in a large range. At the same time, when the dynamic deflection of the suspension is too large, the electromagnetic spring mechanism can stop working, reducing the probability of the suspension hitting the limit block; and it is not affected by the change in the static balance position of the suspension due to the change in the sprung mass of the air spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 is a structural schematic diagram of an electromagnetic quasi-zero stiffness air suspension provided by an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 Schematic diagram of the structure of the electromagnetic spring mechanism;

[0021] Figure 3 is a schematic diagram of the arrangement of the electromagnet Ⅰ in the plate Ⅰ in an embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of the working state of the electromagnetic spring when the air spring is compressed in the present invention;

[0023] Figure 5 It is a schematic diagram of the working state of the electromagnetic spring when the air spring in the present invention is stretched;

[0024] In the figure: 10, air spring mechanism; 101, membrane air spring; 102, base;

[0025] 20. Electromagnetic spring mechanism; 201. Plate I; 202. Plate II; 203. Plate III; 204. Plate IV; 205. Electromagnet I; 206. Electromagnet II; 207. Permanent magnet I; 208. Permanent magnet II; 209. Retractable magnetic shielding plate I; 210. Retractable magnetic shielding plate II; 211. Rotating shaft I; 212. Rotating shaft II; 213. Rotating shaft III; 214. Rotating shaft IV; 215. Rotating shaft V; 216. Rotating shaft VI; 217. Rotating shaft VII; 218. Rotating shaft VIII; 219. Rotating shaft IX;

[0026] 30. Upper cover plate; 40. Lower base plate. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 The electromagnetic quasi-zero stiffness air suspension provided by the present invention includes an air spring mechanism 10 and an electromagnetic spring mechanism 20, wherein an upper cover plate 30 is provided on the top of the air spring mechanism 10 and the electromagnetic spring mechanism 20, and a lower base plate 40 is provided on the bottom of the air spring mechanism 10 and the electromagnetic spring mechanism 20, and two electromagnetic spring mechanisms 20 are symmetrically provided on both sides of the air spring mechanism 10; the two electromagnetic spring mechanisms 20 are negative stiffness springs, and the air spring mechanism 10 is a positive stiffness spring, which are arranged in parallel between the upper cover plate 30 and the lower base plate 40 to form a quasi-zero stiffness air suspension; the restoring force generated by the air spring during extension and retraction is offset by adjusting the height of the electromagnetic spring mechanism 20 to achieve quasi-zero stiffness. The specific process is as follows:

[0029] When the suspension is stationary, the electromagnetic spring mechanism 20 is not energized, and only the air spring mechanism 10 plays a supporting role, which is static high stiffness; when the suspension vibrates, the electromagnetic spring mechanism 20 is energized to offset the restoring force generated by the air spring mechanism 10 during compression or extension by adjusting its height, thereby achieving quasi-zero stiffness, which is dynamic low stiffness. This solution is highly open, and the current of the energized coil in the electromagnet of the electromagnetic spring mechanism can be controlled to adjust the appropriate quasi-zero stiffness dynamic deflection range or the stiffness of the suspension according to parameters such as the suspension, the car and the road surface.

[0030] In a specific embodiment of the present invention, Figure 2As shown, the electromagnetic spring mechanism 20 is a diamond-shaped electromagnetic spring, including four frames and a telescopic frame. The telescopic frame is a telescopic structure and is arranged inside the frame composed of four frames. The four connecting ends of the telescopic frame are respectively rotatably connected to the inner sides of the four frames; the four frames are respectively plates I 201, II 202, III 203 and IV 204 which are rotatably connected head to tail, and the opposite sides of the plates I 201 and III 203 are respectively provided with electromagnets I 205 and II 206, and the opposite sides of the plates II 202 and IV 204 are respectively provided with permanent magnets I 207 and II 208, and the magnetic poles of the opposite sides of the permanent magnets I 207 and II 208 are opposite; the four connecting ends of the telescopic frame are respectively rotatably connected to the middle parts of the four frames; the magnetic field strength and magnetic poles of the electromagnets I 205 and II 206 are adjusted by changing the current size and direction in the energized coils of the electromagnets I 205 and II 206, thereby adjusting the stiffness of the diamond-shaped electromagnetic spring 20.

[0031] By adjusting the parameters of the electromagnet and the permanent magnet, as well as the magnitude and direction of the current in the electromagnet's energized coil, the ideal negative stiffness can be obtained, achieving quasi-zero stiffness in a larger range; at the same time, when the suspension deflection is too large, the electromagnetic spring mechanism 20 can stop working, reducing the probability of the suspension hitting the limit block.

[0032] Further optimize the above technical solution, such as Figure 2 As shown, the telescopic frame includes a telescopic magnetic isolation plate I 209 and a telescopic magnetic isolation plate II 210, the middle parts of the telescopic magnetic isolation plate I 209 and the telescopic magnetic isolation plate II 210 are connected in rotation, and both ends of the telescopic magnetic isolation plate I 209 and the telescopic magnetic isolation plate II 210 are telescopic connection ends; the two connection ends of the telescopic magnetic isolation plate I 209 are respectively connected in rotation with the middle parts of the plate I 201 and the plate III 203, and the two connection ends of the telescopic magnetic isolation plate II 210 are respectively connected in rotation with the middle parts of the plate II 202 and the plate IV 204. When the magnetic field passes through the telescopic magnetic isolation plate I 209 and the telescopic magnetic isolation plate II 210, the magnetic field intensity can be greatly attenuated, and a certain magnetic isolation effect is played, and the inside of the electromagnetic spring with a diamond structure is divided into four magnetic field regions.

[0033] As a preferred structure, Figure 1 , 2As shown, the plate I201 and the plate IV204 are connected in rotation via the rotating shaft I211, the plate I201 and the plate II202 are connected in rotation via the rotating shaft II212, the plate II202 and the plate III203 are connected in rotation via the rotating shaft III213, and the plate III203 and the plate IV204 are connected in rotation via the rotating shaft IV214; the two connecting ends of the retractable magnetic isolation plate I209 are connected to the plate I201 and the plate III203 via the rotating shaft V respectively. 215 and the rotating shaft VII 217 are rotationally connected, the two connecting ends of the retractable magnetic isolation plate II 210 are rotationally connected with the plate II 202 and the plate IV 204 respectively through the rotating shaft VI 216 and the rotating shaft VIII 218, the retractable magnetic isolation plate I 209 and the middle part of the retractable magnetic isolation plate II 210 are rotationally connected through the rotating shaft IX 219; the rotating shaft I 211 is rigidly connected to the upper cover plate 30, and the rotating shaft III 213 is rigidly connected to the lower base plate 40. During the specific production, shaft II 212 is rigidly connected to plate II 202, shaft IV 214 is rigidly connected to plate IV 204, shaft V 215, shaft VI 216, shaft VII 217 and shaft VIII 218 are rigidly connected to plate I 201, plate II 202, plate III 203 and plate IV 204 respectively, and shaft IX 219 is rigidly connected to retractable magnetic isolation plate II 210. Plate I 201 and plate IV 204 rotate around rotation axis I 211, plate I 201 rotates around rotation axis II 212, plate II 202 and plate III 203 rotate around rotation axis III 213, plate III 203 rotates around rotation axis IV 214, retractable magnetic isolation plate I 209 can rotate around rotation axis V 215, rotation axis VII 217 and rotation axis IX 219, retractable magnetic isolation plate II 210 can rotate around rotation axis VI 216 and rotation axis VIII 218

[0034] In the specific design, the plates I 201, II 202, III 203 and IV 204 are provided with mounting grooves on their inner sides, the electromagnets I 205 and II 206 are correspondingly arranged in the mounting grooves of the plates I 201 and III 203, and the permanent magnets I 207 and II 208 are correspondingly arranged in the mounting grooves of the plates II 202 and IV 204. Figure 3 As shown, the electromagnet I 205 is correspondingly arranged in the mounting groove of the plate I 201. Among them, the four frames of the rhombus electromagnetic spring 20 and the internal telescopic frame are all made of non-magnetic or weakly magnetic conductive materials. The permanent magnet I 207 and the permanent magnet II 208 are both made of neodymium iron boron materials. The magnetic field strength and magnetic pole of the electromagnet are adjusted by changing the magnitude and direction of the current in the energized coils of the electromagnet I 205 and the electromagnet II 206, thereby adjusting the stiffness of the rhombus electromagnetic spring 20.

[0035] In a specific embodiment, Figure 1 As shown, the air spring mechanism 10 is a diaphragm air spring 101 , the upper end of the diaphragm air spring 101 is connected to the upper cover plate 30 , and the lower end of the diaphragm air spring 101 is connected to the lower base plate 40 via a base 102 .

[0036] The working principle of the present invention is as follows:

[0037] When the suspension is stationary, the energized coils of the electromagnet I 205 and the electromagnet II 206 are not energized, and only the air spring 10 supports the weight of the vehicle body. At this time, the stiffness of the rhombus electromagnetic spring 20 is zero. When the sprung mass changes at rest, the height of the rhombus electromagnetic spring 20 changes accordingly with the deformation of the air spring 10. Therefore, when the sprung mass changes, there is no need to adjust the balance position.

[0038] When the suspension vibrates, the energized coils of electromagnet I 205 and electromagnet II 206 are energized to generate a magnetic field. Figure 4 As shown, when the air spring 10 is compressed, the magnetic poles of the electromagnet Ⅰ205 and the permanent magnet Ⅰ207 facing inward are opposite, and the magnetic poles of the electromagnet Ⅱ206 and the permanent magnet Ⅰ207 facing inward are the same, then an attraction is generated between the electromagnet Ⅰ205 and the permanent magnet Ⅰ207, a repulsion is generated between the electromagnet Ⅰ205 and the permanent magnet Ⅱ208, a repulsion is generated between the electromagnet Ⅱ206 and the permanent magnet Ⅰ207, and an attraction is generated between the electromagnet Ⅱ206 and the permanent magnet Ⅱ208, so that the plate Ⅰ20 The angles between plate 1 and plate II 202, plate III 203 and plate IV 204 tend to decrease, while the angles between plate I 201 and plate IV 204, plate II 202 and plate III 203 tend to increase, which results in the diamond electromagnetic spring 20 having a tendency to decrease in height, exerting a downward force on the upper cover plate 30 and an upward force on the lower base plate 40. By adjusting the current of the energized coil and thus adjusting the electromagnetic field strength, the restoring force of the air spring 10 can be offset, thereby achieving quasi-zero stiffness of the suspension system.

[0039] like Figure 5 As shown, when the air spring 10 is stretched, the magnetic poles of the electromagnet Ⅰ205 and the permanent magnet Ⅰ207 facing the same direction, and the magnetic poles of the electromagnet Ⅱ206 and the permanent magnet Ⅰ207 facing the opposite direction, a repulsive force is generated between the electromagnet Ⅰ205 and the permanent magnet Ⅰ207, an attractive force is generated between the electromagnet Ⅰ205 and the permanent magnet Ⅱ208, an attractive force is generated between the electromagnet Ⅱ206 and the permanent magnet Ⅰ207, and a repulsive force is generated between the electromagnet Ⅱ206 and the permanent magnet Ⅱ208, so that the plate Ⅰ201 and The angles among plates II 202, III 203 and IV 204 tend to increase, while the angles among plates I 201 and IV 204, as well as those among plates II 202 and III 203 tend to decrease, which results in the diamond electromagnetic spring 20 tending to increase in height, exerting an upward force on the upper cover plate 30 and a downward force on the lower base plate 40. By adjusting the current of the energized coil and thus the electromagnetic field strength, the restoring force of the air spring 10 can be offset, thereby achieving quasi-zero stiffness of the suspension system.

[0040] The present invention further provides a car, comprising the electromagnetic quasi-zero stiffness air suspension. Any car comprising the electromagnetic quasi-zero stiffness air suspension is within the protection scope of the present invention.

[0041] The present invention adopts a design combining an electromagnet and a permanent magnet with a diamond-shaped component. By changing the current size and direction of the energized coil in the electromagnet, the magnetic field strength and magnetic pole of the electromagnet are changed, and the interaction with the permanent magnet changes the height change trend of the diamond-shaped electromagnetic spring, offsets the restoring force of the air spring, achieves quasi-zero stiffness, reduces the natural frequency and force transmission rate of the system, and improves the vibration isolation performance of the suspension. When the suspension amplitude is too large, the electromagnet energized coil is not energized, and only the air spring is involved in the work, reducing the probability of the suspension hitting the limit block.

[0042] In summary, the present invention has the advantages of simple and compact structure and convenient operation. It has the characteristics of low natural frequency and high static load stiffness of air springs. It retains the original structure of air springs and uses the space between the upper cover plate and the lower cover plate to install diamond electromagnetic springs. The use of electromagnetic springs without contact force can reduce friction and parts loss; the present invention is not affected by the change of the static balance position of the suspension caused by the change of the mass on the spring, and does not need to be adjusted back to the original position by filling and deflating the air spring when the static balance position changes; the ideal negative stiffness is obtained by adjusting the parameters of the electromagnet and the permanent magnet, as well as the current size and direction of the electromagnet energized coil, and a quasi-zero stiffness in a larger range is achieved. At the same time, it can stop participating in work when the dynamic deflection of the suspension is too large, reducing the probability of the suspension hitting the limit block.

[0043] The present invention has great openness and can adjust the appropriate quasi-zero stiffness dynamic deflection range or the stiffness of the suspension according to the parameters of the suspension, the vehicle and the road surface by controlling the current of the electromagnet energizing coil. The present invention realizes the ideal characteristics of the suspension of "high static and low dynamic" and improves the vibration isolation performance of the suspension.

[0044] In the above description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed above.

Claims

1. An electromagnetic quasi-zero stiffness air suspension, characterized in that: It comprises an air spring mechanism and an electromagnetic spring mechanism, wherein an upper cover plate is arranged on the top of the air spring mechanism and the electromagnetic spring mechanism, a lower bottom plate is arranged on the bottom of the air spring mechanism and the electromagnetic spring mechanism, and two electromagnetic spring mechanisms are symmetrically arranged on both sides of the air spring mechanism; the two electromagnetic spring mechanisms are negative stiffness springs, and the air spring mechanism is a positive stiffness spring, which are arranged in parallel between the upper cover plate and the lower bottom plate to form a quasi-zero stiffness air suspension; the restoring force generated by the air spring during extension and contraction is offset by adjusting the height of the electromagnetic spring mechanism to achieve quasi-zero stiffness; When the suspension is stationary, the electromagnetic spring mechanism is not energized, and only the air spring mechanism plays a supporting role, which is static high stiffness; when the suspension vibrates, the electromagnetic spring mechanism is energized to adjust its height to offset the restoring force generated by the air spring mechanism when it is compressed or stretched, thereby achieving quasi-zero stiffness, which is dynamic low stiffness; The electromagnetic spring mechanism is a diamond-shaped electromagnetic spring, comprising four frames and a telescopic frame. The telescopic frame is a telescopic structure and is arranged inside a frame composed of four frames. The four connecting ends of the telescopic frame are respectively rotatably connected to the inner sides of the four frames. The four frames are respectively plates I, II, III and IV which are rotatably connected head to tail in sequence. Electromagnets I and II are respectively arranged on the opposite sides of plates I and III. Permanent magnets I and II are respectively arranged on the opposite sides of plates II and IV. The magnetic poles of the opposite sides of permanent magnets I and II are opposite. The four connecting ends of the telescopic frame are respectively rotatably connected to the middle parts of the four frames. The magnetic field strength and magnetic poles of electromagnets I and II are adjusted by changing the current size and direction in the energized coils of electromagnets I and II, thereby adjusting the stiffness of the diamond-shaped electromagnetic spring.

2. The electromagnetic quasi-zero stiffness air suspension according to claim 1, characterized in that: The telescopic frame includes a telescopic magnetic isolation plate I and a telescopic magnetic isolation plate II. The middle parts of the telescopic magnetic isolation plate I and the telescopic magnetic isolation plate II are rotatably connected, and both ends of the telescopic magnetic isolation plate I and the telescopic magnetic isolation plate II are telescopic connecting ends; the two connecting ends of the telescopic magnetic isolation plate I are respectively rotatably connected to the middle parts of plate I and plate III, and the two connecting ends of the telescopic magnetic isolation plate II are respectively rotatably connected to the middle parts of plate II and plate IV.

3. The electromagnetic quasi-zero stiffness air suspension according to claim 2, characterized in that: The plates I and IV are rotationally connected via shaft I, the plates I and II are rotationally connected via shaft II, the plates II and III are rotationally connected via shaft III, and the plates III and IV are rotationally connected via shaft IV; the two connecting ends of the retractable magnetic isolation plate I are rotationally connected to the plates I and III via shaft V and shaft VII respectively, the two connecting ends of the retractable magnetic isolation plate II are rotationally connected to the plates II and IV via shaft VI and shaft VIII respectively, and the middle parts of the retractable magnetic isolation plate I and the retractable magnetic isolation plate II are rotationally connected via shaft IX; the shaft I is connected to the upper cover plate, and the shaft III is connected to the lower base plate.

4. The electromagnetic quasi-zero stiffness air suspension according to claim 2, characterized in that: The plates I, II, III and IV are all provided with mounting grooves on their inner sides, the electromagnets I and II are correspondingly arranged in the mounting grooves of plates I and III, and the permanent magnets I and II are correspondingly arranged in the mounting grooves of plates II and IV.

5. The electromagnetic quasi-zero stiffness air suspension according to claim 1, characterized in that: The four frames of the diamond-shaped electromagnetic spring and the internal telescopic frame are all made of non-magnetic or weakly magnetic materials.

6. The electromagnetic quasi-zero stiffness air suspension according to claim 1, characterized in that: The permanent magnet I and the permanent magnet II are both made of neodymium iron boron material.

7. The electromagnetic quasi-zero stiffness air suspension according to claim 1, characterized in that: The air spring mechanism is a membrane type air spring, the upper end of the membrane type air spring is connected to the upper cover plate, and the lower end of the membrane type air spring is connected to the lower base plate through a base.

8. A car, characterized in that: It comprises an electromagnetic quasi-zero stiffness air suspension as described in any one of claims 1-7.

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