Intelligent self-powered active suspension with multi-level height adjustment and working method thereof

Abstract

The present invention discloses an intelligent self-powered active suspension with multi-level adjustable height in the automotive field and a working method thereof. The rod ends of the cylinder rod extending into the oil cylinder are all guide ends composed of a guide, a screw and a nut. There is no seal between the outer wall of the guide and the inner wall of the oil cylinder. The screw and the cylinder rod are provided with oil guide grooves that penetrate the rodless cavity and the rod cavity, and there is no need to consider the sealing problem. A non-closed working oil circuit is adopted, and a suspension height adjustment device comprises a first and a second height adjustment oil and gas cylinders with unequal volumes. The first height adjustment oil and gas cylinder, a third solenoid valve, a high-pressure gas storage tank, a first non-return valve, an electric air compressor unit and a low-pressure gas storage tank are connected in series in sequence, and energy can be pre-stored in advance. Four-speed height control is achieved by two parallel-connected height adjustment oil and gas cylinders with different volumes, so that the vehicle body can be at a low height when the vehicle is driving at high speed, at a normal height when the vehicle body is in urban conditions, and at a height when the vehicle body is driving on bumpy roads. The vehicle body can also be rescued from a pit when the wheel is stuck in it.

Description

Technical Field

[0001] The present invention belongs to the field of automobiles and relates to a suspension used in automobiles, specifically a highly multi-level adjustable intelligent self-powered active suspension and a working method thereof, which can effectively improve the ride comfort and rollover stability of an automobile. Background Art

[0002] The self-powered active suspension adopts the traditional vibration reduction structure, the third mass of the suspension and the anti-resonance vibration reduction structure connected in series from bottom to top. Compared with the passive suspension, semi-active suspension and active suspension with the traditional first-level vibration reduction configuration, it can effectively reduce the high-frequency vibration of the vehicle body and is particularly suitable for vehicle driving conditions where the high-frequency components of road roughness account for a relatively high proportion.

[0003] In order to make the anti-resonance vibration reduction structure provide a larger iso-inertia and a larger iso-damping to improve driving safety when the vibration frequency of the car is low, and provide a smaller iso-inertia and a smaller iso-damping to improve riding comfort when the vibration frequency of the car is high, the document with Chinese patent application number 202210265080.8 and the name "Autonomous Intelligent Self-Powered Active Suspension and Working Method Using Double-Head Cylinder" provides an anti-resonance vibration reduction structure composed of a double-head cylinder and a coil spring, and an intelligent control switch is set in the anti-resonance oil circuit to control the iso-inertia and iso-damping of the oil circuit. However, the obvious problem of the self-powered active suspension is that the working oil circuit for the anti-resonance structure is a closed oil circuit, and the intelligent control switch is limited to controlling only the damping and inertia of the anti-resonance structure. Therefore, better driving safety and riding comfort cannot be obtained.

[0004] In order to avoid the problem of a sharp deterioration in ride comfort caused by the impact of the suspension limit when driving on bumpy roads, a document with Chinese patent application number 202111311617.1 and titled "Self-powered active suspension with adjustable height and stiffness and its working method" provides a traditional shock absorbing structure in which the stiffness is mainly borne by the first coil spring and has a smaller stiffness, thereby obtaining better ride comfort and better driving safety; while when driving on bad roads and in a high body state, the stiffness of the traditional shock absorbing structure is provided in parallel by the oil-gas spring formed by the first coil spring and the first oil-gas chamber filled with oil, and has a larger stiffness; although the self-powered active suspension can achieve suspension height adjustment under the operation of the vehicle body height and suspension stiffness adjustable device, its obvious problem is: since the working oil circuit for the traditional shock absorbing structure is a closed oil circuit, when the suspension height increases, the stiffness of the traditional shock absorbing structure also increases at the same time, and then the vibration isolation function of the traditional shock absorbing structure deteriorates; in addition, the suspension height can only be adjusted under two working conditions: good road mode and bad road mode, and there are only two height options, therefore, The functions are limited and cannot meet more functional requirements such as getting the wheel out of a pothole and improving the car's rollover stability.

[0005] In the current self-powered active suspension, the oil cylinders used in traditional vibration reduction structures and anti-resonance vibration reduction structures have damping force or damping force and inertia force, and there is a pressure difference on both sides of the axial direction of the piston in the oil cylinder. The piston needs to be sealed and the sealing requirements are high. The piston is a wearing part with a short life. Once the seal is damaged, leakage will occur in the oil cylinder, and the oil will flow directly through the damaged part through the piston, which will cause the oil cylinder of the traditional vibration reduction structure to be unable to provide damping force and the oil cylinder of the anti-resonance vibration reduction structure to be unable to provide damping force and inertia force, affecting the vibration reduction effect. Summary of the invention

[0006] The purpose of the present invention is to solve all the above problems existing in the existing self-powered active suspension, and proposes a new multi-level adjustable height intelligent self-powered active suspension and its working method. There is no need to consider the piston sealing problem and the effective working area of ​​the cylinder can be effectively increased. While reducing the manufacturing cost, the reliability of the entire suspension system is improved, and multi-level height adjustment of the suspension is provided. In addition to improving the driving comfort of the car and enabling the car to get out of a wheel pit, it also has the function of improving the rollover stability of the car.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the multi-level adjustable height intelligent self-powered active suspension of the present invention is: the traditional vibration reduction structure and the anti-resonance vibration reduction structure thereof each have an oil cylinder, the cylinder rod moves up and down axially in the oil cylinder, and the rod ends of the oil cylinder rod extending into the oil cylinder are guide ends that divide the oil cylinder into a rodless cavity and a rod cavity, and the guide ends are composed of a guide, a screw and a nut, the screw is an externally threaded rod that extends axially from the rod body of the oil cylinder rod and has an outer diameter smaller than the rod body, the guide is a cylindrical shape that is sleeved on the outside of the screw through an internal thread, the nut matches the screw, and there is no seal between the outer wall of the guide and the inner wall of the oil cylinder; the screw and the oil cylinder rod are provided with oil guide grooves that pass through the rodless cavity and the rod cavity; the suspension height adjustment device supplies oil to the oil cylinder of the traditional vibration reduction structure and refluxes the oil to adjust the vehicle body to four height states: low height, normal height, higher height or maximum height for escape.

[0008] The suspension height adjustment device comprises a first and a second height adjustment oil and gas cylinder with unequal volumes, the first height adjustment oil and gas cylinder, the third solenoid valve, the high-pressure gas storage tank, the first non-return valve, the electric air compressor unit and the low-pressure gas storage tank are connected in series in sequence, and the two ends of the first height adjustment oil and gas cylinder and the third solenoid valve are connected in series in parallel with the second height adjustment oil and gas cylinder and the fifth solenoid valve in series; the first and the second height adjustment oil and gas cylinders, the cylinder outlets of which are connected in parallel and connected to the first oil and gas chamber and the first oil cylinder respectively by hydraulic pipelines, the cylinder inlet of the first height adjustment oil and gas cylinder is connected to the inlet of the second solenoid, the cylinder inlet of the second height adjustment oil and gas cylinder is connected to the inlet of the fourth solenoid, and the outlets of the second and fourth solenoids are connected to the low-pressure gas storage tank via an air pipe; the controller is connected to the electric air compressor unit, the second, third, fourth and fifth solenoid valves respectively through control lines.

[0009] The working method of the multi-level adjustable height intelligent self-powered active suspension of the present invention adopts the technical scheme as follows: when the car is parked and the engine is not started, the controller controls the second and fourth solenoid valves to be opened, the third and fifth solenoid valves to be closed, the first and second height adjustment oil and gas cylinders are not working, and the vehicle body is in a low height state; in the urban working condition driving mode, the controller controls the second, fourth and fifth solenoid valves to be closed, the third solenoid valve to be opened, the compressed air enters the first height adjustment oil and gas cylinder from the high-pressure gas storage tank through the third solenoid valve, the first height adjustment oil and gas cylinder with a smaller volume works, the hydraulic oil is emptied and input into the first oil cylinder, and the vehicle body is in a normal height state; in the bad road driving mode, the controller controls the second, third and fourth solenoid valves to be closed, the fifth solenoid valve to be opened, the compressed air enters the second height adjustment oil and gas cylinder from the high-pressure gas storage tank through the fifth solenoid valve, the second height adjustment oil and gas cylinder with a larger volume works, the hydraulic oil is emptied and input into the first oil cylinder, and the vehicle body is in a higher height state; in the escape mode, the controller controls the second and fourth solenoid valves to be closed, the third and fifth solenoid valves to be opened, the first and second height adjustment oil and gas cylinders work synchronously, and the vehicle body height is in the highest height state for escape.

[0010] Furthermore, when the first height-adjusting oil cylinder needs to recover hydraulic oil to lower the suspension height, the controller controls the third solenoid valve to close and the second solenoid valve to open, and the hydraulic oil in the first cylinder flows back to the first height-adjusting oil cylinder; when the second height-adjusting oil cylinder needs to recover hydraulic oil to lower the suspension height, the controller controls the fifth solenoid valve to close and the fourth solenoid valve to open, and the hydraulic oil in the first cylinder flows back to the second height-adjusting oil cylinder.

[0011] Furthermore, when the car turns, the two controllers in the two suspensions turning inside respectively control their respective third and fifth solenoid valves to close and the second and fourth solenoid valves to open, and the two suspensions turning inside are lowered to the lowest level; at the same time, the controllers of the two suspensions turning outside control their respective second and fourth solenoid valves to close and the third and fifth solenoid valves to open, and the two suspensions turning outside are at the highest height state for getting out of trouble.

[0012] The beneficial effects of the present invention after adopting the above technical solution are:

[0013] 1. Compared with the suspension provided by Chinese patent application No. 202111311617.1, entitled “Self-powered active suspension with adjustable height and stiffness and its working method” and Chinese patent application No. 202210265080.8, entitled “Autonomous intelligent self-powered active suspension and its working method using double-head oil cylinder”, the present invention adopts a non-closed working oil circuit and realizes four-speed height control through two parallel height adjustment oil and gas cylinders of different volumes. Unlike the intelligent control switch that only controls the damping and inertia of the anti-resonance structure, the present invention synchronously controls the damping of the traditional damping junction and the damping and inertia of the anti-resonance structure, thereby obtaining better driving safety and riding comfort and meeting the requirements of multi-speed height control; at the same time, the present invention also has the function of improving the rollover stability of the vehicle, and also has the exhaust gas recovery function of the suspension height adjustment device, which can not only save energy, but also speed up the working speed of the suspension height adjustment device.

[0014] 2. In the suspension provided by Chinese patent application No. 202111311617.1, entitled “Self-powered active suspension with adjustable height and stiffness and working method thereof” and Chinese patent application No. 202210265080.8, entitled “Autonomous intelligent self-powered active suspension and working method using double-head cylinder”, the effective working area of ​​the first cylinder is the cross-sectional area of ​​the first cylinder or it minus the cross-sectional area of ​​the first piston rod, and the effective working area of ​​the second cylinder is the cross-sectional area of ​​the second cylinder or it minus the cross-sectional area of ​​the second piston rod; and the suspension provided by the present invention does not need to consider the sealing problem, the effective working area of ​​the first cylinder is the cross-sectional area of ​​the first cylinder rod, and the effective working area of ​​the second cylinder is the cross-sectional area of ​​the second cylinder rod, and only the cylinder rod outlet end with good reliability needs to be sealed. Therefore, the present invention has parameter stability and can obtain lower manufacturing cost and working reliability than conventional existing oil and gas springs.

[0015] 3. Since the suspension provided by the present invention does not need to consider the sealing problem, both the traditional vibration reduction structure and the anti-resonance vibration reduction structure can adopt a large-rod diameter cylinder rod, and the connecting oil channel formed by multiple oil guide grooves is set on the screw of the guide, so that there is no need to set an oil channel on the guide, and the outer periphery of the guide is complete, thereby ensuring the consistency of the mechanical properties of the guide in the radial direction, obtaining better working reliability and longer service life, and increasing the effective working area of ​​the oil-gas spring cylinder by increasing the cylinder rod diameter.

[0016] 4. When the multi-level adjustable height intelligent self-powered active suspension of the present invention is working, it can realize multi-level adjustment of suspension height, and can quickly and accurately adjust between low height, normal height, higher height and escape height, so as to realize the low height of the car body when the car is driving at high speed, the normal height of the car body in urban conditions, and the selection of the height of the car body when driving on bumpy roads, and can also perform escape operations when the wheels are stuck in a pit, and obtain better rollover stability under the turning condition of the car.

[0017] 5. The present invention improves the rollover stability of the car by using compressed air to operate the suspension height adjustment device, and can realize pre-charging of compressed air in advance, that is, pre-storing energy in advance. Compared with the electric active anti-roll bar without energy storage assistance, the suspension height adjustment speed for improving the rollover stability of the car can be greatly accelerated.

[0018] 6. When the multi-level height-adjustable intelligent self-powered active suspension of the present invention is working, only the first oil cylinder of the traditional shock-absorbing structure provides suspension height adjustment operation. Under different suspension heights, the stiffness and damping characteristics of the traditional shock-absorbing structure are basically the same. Compared with the necessary increase in suspension stiffness when the air spring is used to increase the vehicle body height, better riding comfort can be obtained under bumpy conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a first embodiment of the multi-level adjustable height intelligent self-powered active suspension of the present invention;

[0020] Figure 2 yes Figure 1 An enlarged view of the internal structure of the first oil cylinder 6 and a partial external oil circuit diagram;

[0021] Figure 3 yes Figure 2 Enlarged view of the middle AA section;

[0022] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle suspension height adjustment device 2 and its partial external oil circuit diagram.

[0023] In the figure: 1. first oil and gas chamber; 2. suspension height adjustment device; 3. first bushing; 4. wheel; 5. first cylinder rod; 6. first oil cylinder; 7. additional mass block; 8. inertia spiral tube; 9. first solenoid valve; 10. intelligent control switch; 11. second oil and gas chamber; 12. second oil cylinder; 13. second cylinder rod; 14. upper bracket for spiral spring installation; 15. second bushing; 16. vehicle body; 17. spiral spring; 18. lower bracket for spiral spring installation; 19. first throttle valve; 20. nut; 21. oil guide groove; 22. bolt; 23. guide; 24. second solenoid valve; 25. third solenoid valve; 26. high-pressure gas storage tank; 27. fourth solenoid valve; 28. first non-return valve; 29. ​​electric air compressor unit; 30. air filter; 31. second non-return valve; 32. low-pressure gas storage tank; 33. pressure sensor; 34. controller; 35. The fifth solenoid valve; 36. The second height-adjusting oil-gas cylinder; 37. The first height-adjusting oil-gas cylinder; 38. The sixth solenoid valve; 39. The second throttle valve. DETAILED DESCRIPTION

[0024] like Figure 1 As shown, the multi-level height adjustable intelligent self-powered active suspension of the present invention is installed between the wheel 4 and the vehicle body 16 located above the wheel 4, and from bottom to top are the traditional vibration reduction structure and the anti-resonance vibration reduction structure connected in series. The traditional vibration reduction structure is connected to the suspension height adjustment device 2 through a hydraulic pipeline, and the suspension height adjustment device 2 is arranged next to the traditional vibration reduction structure. The traditional vibration reduction structure includes a parallel oil circuit composed of a first oil cylinder 6, a first oil-gas chamber 1, a first throttle valve 19, a second throttle valve 39 and a sixth solenoid valve 38. The first oil cylinder 6 is arranged up and down, and the first oil cylinder rod 5 can move up and down in the first oil cylinder 6 along the axial direction. The anti-resonance vibration reduction structure has a coil spring 17, an inertia coil 8, a first solenoid valve 9, an intelligent control switch 10 and a second oil cylinder 12. The second oil cylinder 12 is arranged up and down, and the second oil cylinder rod 13 can move up and down in the second oil cylinder 12 along the axial direction.

[0025] The upper end of the first oil cylinder rod 5 is a guide end, which extends upward inside the first oil cylinder 6 to divide the first oil cylinder 6 into two upper and lower oil chambers. The upper oil chamber is a rodless chamber, and the lower oil chamber is a rod chamber. Both the rodless chamber and the rod chamber store oil. The first oil cylinder 6 is connected in series with the suspension height adjustment device 2, the first throttle valve 19, the second throttle valve 39 and the parallel oil circuit composed of the sixth solenoid valve 38, and the first oil-gas chamber 1 through a hydraulic pipeline, forming an adjustment oil circuit of a traditional vibration reduction structure. The adjustment oil circuit can be connected to the rodless chamber of the first oil cylinder 6 or the rod chamber of the first oil cylinder 6, that is, the rodless chamber or the rod chamber of the first oil cylinder 6 is connected to the adjustment oil circuit through a hydraulic pipeline. The lower end of the first oil cylinder rod 5 extends downward outside the first oil cylinder 6 and is fixedly connected to the wheel 4 below through the first bushing 3. The suspension height adjustment device 2 can supply oil to the first oil cylinder 6, and can also allow the oil in the first oil cylinder 6 to flow back therein, thereby adjusting the vehicle body height to four levels: a low height state, a normal height state, a higher height state than the normal height, or a maximum height state for escaping from trouble.

[0026] The lower end of the second oil cylinder rod 13 is a guide end, which extends downward inside the second oil cylinder 12 to divide the second oil cylinder 12 into upper and lower oil chambers. The upper oil chamber is a rod chamber, and the lower oil chamber is a rodless chamber. Oil is stored in both the rod chamber and the rodless chamber of the second oil cylinder 12. The second oil cylinder 12 is connected in series with the inertia coil 8, the intelligent control switch 10, and the second oil and gas chamber 11 in sequence through a hydraulic pipeline. The first solenoid valve 9 is connected in parallel at both ends of the intelligent control switch 10. The first solenoid valve 9 is a normally closed delayed closing solenoid valve. The intelligent control switch 10 is connected to the normally closed first solenoid valve 9 through a control line, and can control the opening of the first solenoid valve 9. In this way, a working oil circuit of an anti-resonance vibration reduction structure is formed. The working oil circuit can be connected in series with the rodless chamber of the second oil cylinder 12 or the rod chamber of the second oil cylinder 12, that is, the rodless chamber or the rod chamber of the second oil cylinder 12 is connected in series with the working oil circuit through a hydraulic pipeline. The upper end of the second cylinder rod 13 extends upward outside the second cylinder 12 and is fixedly connected to the vehicle body 16 via a second bushing 15 .

[0027] A coil spring 17 is arranged in the space above the vehicle body 16 and the second oil cylinder 12, the upper end of the coil spring 17 is fixedly connected to the upper end of the second oil cylinder rod 13, and the lower end of the coil spring 17 is rigidly connected to the cylinder body of the second oil cylinder 12. The best implementation structure is: the coil spring 17 is coaxially sleeved on the second oil cylinder rod 13 and the second oil cylinder 12, the upper end of the coil spring 17 is fixedly connected to the upper end of the second oil cylinder rod 13 through the coil spring mounting upper bracket 14, the coil spring mounting upper bracket 14 is fixedly sleeved outside the second oil cylinder rod 13, and the upper end of the coil spring 17 is fixedly connected to the coil spring mounting upper bracket 14; the lower end of the coil spring 17 is fixedly connected to the cylinder body of the second oil cylinder 12 through the coil spring mounting lower bracket 18, the coil spring mounting lower bracket 18 is fixedly sleeved outside the cylinder body of the second oil cylinder 12, and the lower end of the coil spring 17 is fixedly connected to the coil spring mounting lower bracket 18. The central axes of the coil spring 17 , the second oil cylinder 12 and the second oil cylinder rod 13 are vertical and collinear.

[0028] The second oil cylinder 12 is located above the first oil cylinder 6, and the central axes of the two are vertical and collinear, and the bottoms of the two cylinder bodies are fixedly connected to form a whole after being face-to-face fitted. An additional mass block 7 is fixedly connected to the cylinder bodies of the first oil cylinder 6 and the second oil cylinder 12, and the additional mass block 7 is fixedly sleeved outside the cylinder bodies of the first oil cylinder 6 and the second oil cylinder 12, as part of the third mass of the suspension.

[0029] In order to make full use of the mass of the suspension itself, the first oil-gas chamber 1 and the second oil-gas chamber 11 are fixed on the first oil cylinder 6 and the second oil cylinder 12, and together with the additional mass block 7, the first oil cylinder 6 and the second oil cylinder 12 serve as the third mass of the suspension. That is, the total mass of the third mass of the suspension includes the mass of the first oil-gas chamber 1 and the mass of the second oil-gas chamber 11.

[0030] In addition to the first solenoid valve 9, the intelligent control switch 10 is also connected to the normally closed sixth solenoid valve 38 through a control line, thereby controlling the regulating oil circuit of the traditional vibration damping structure. The intelligent control switch 1 synchronously controls the opening and closing of the first solenoid valve 9 and the sixth solenoid valve 38. When the car is driving at high speed on a good road, the intelligent control switch 10 simultaneously controls the first solenoid valve 9 and the sixth solenoid valve 38 to close, so that the traditional vibration damping structure provides large damping, and the anti-resonance structure provides large damping and large inertia, thereby obtaining better driving safety; when the car is driving on a bad road, the intelligent control switch 10 simultaneously controls the first solenoid valve 9 and the sixth solenoid valve 38 to open, so that the traditional vibration damping structure provides small damping, and the anti-resonance structure provides small damping and small inertia, thereby obtaining better riding comfort. The specific working method of the intelligent control switch 10 is similar to the working method of the intelligent control switch 10 in the suspension provided in the Chinese patent application No. 202210265080.8 and the name "Autonomous Intelligent Self-Powered Active Suspension Using Double-Head Cylinders and Working Method", so it will not be repeated. Therefore, the present invention solves the problem that the intelligent control switch 10 is limited to controlling only the damping and inertia of the anti-resonance structure.

[0031] like Figure 3 and Figure 4 As shown, the first cylinder rod 5 is a large-rod diameter cylinder rod, and the rod end guide end of the first cylinder rod 5 extending in the first cylinder 6 is composed of a guide 23, a screw 22 and a nut 20, wherein the screw 22 is an externally threaded rod extending axially from the first cylinder rod 5 and having an outer diameter smaller than that of the cylinder rod, and the guide 23 is cylindrical and fixedly sleeved on the outside of the screw 22 by an internal thread, and then the nut 20 is used to cooperate with the screw 22 to reinforce the guide 23, and the outer diameter of the nut 20 is also smaller than the outer diameter of the rod end of the first cylinder rod 5.

[0032] The outer diameter of the guide 23 is the same as the inner diameter of the first oil cylinder 6, and the outer diameter of the guide 23 is larger than the outer diameter of the first oil cylinder rod 5. There is no connecting oil passage on the guide 23, so that the rod diameter of the first oil cylinder rod 5 can be maximized. There is no seal between the outer wall of the guide 2 and the inner wall of the first oil cylinder 6, and the material of the guide 23 is softer than that of the first oil cylinder 6.

[0033] The screw rod 22 and the cylinder rod are provided with an oil guide groove 21 which passes through the rodless cavity and the rod cavity, forming a connecting oil passage on both axial sides of the guide 23. The oil guide groove 21 passes through the rodless cavity and the rod cavity of the first cylinder rod 5, that is, connects the two axial sides of the guide 23. Figure 4It is shown that two oil guide grooves 21 are opened on the outer edge of the screw 22 and are connected vertically. The upper end of the oil guide groove 21 is connected to the rodless cavity of the first oil cylinder rod 5, and the lower end of the oil guide groove 21 extends to the first oil cylinder rod 5, forming a connecting oil passage on both sides of the axial direction of the guide 23. The oil guide groove 21 in the present invention can also have other slotting methods, for example, the screw 22 and the part where the oil cylinder rod is connected to it can be set to a hollow shape, and a radial hole is opened in the hollow position of the oil cylinder rod. The oil guide groove 21 is formed by the middle hole and the radial hole to realize the connection between the rodless cavity and the rod cavity of the first oil cylinder rod 5. Therefore, there is no need to set a connecting oil passage on the guide 23 and the outer periphery is complete, ensuring the consistency of the mechanical properties of the guide 23 in the radial direction, obtaining better working reliability and longer service life, and the rod end diameter of the first oil cylinder rod 5 can be increased as much as possible to increase the effective working area of ​​the first oil cylinder 6, and obtain a lower manufacturing cost and working reliability than the conventional existing oil and gas spring.

[0034] The structure of the second oil cylinder rod 13 is the same as that of the first oil cylinder rod 5, and the central axes of the two are colinear and arranged 180 degrees apart. The guide end of the second oil cylinder rod 13 extending into the second oil cylinder 12 is the lower end, and the lower end of the second oil cylinder rod 13 is the guide end, which is also composed of a guide 23, a screw rod 22 and a nut 20. The assembly method and installation requirements between the second oil cylinder rod 13 and the second oil cylinder 12 are the same, so the second oil cylinder rod 13 will not be described in detail.

[0035] Since the lever chamber and the leverless chamber of the first oil cylinder 6 and the second oil cylinder 12 are connected by the oil guide groove 21, the adjustment oil circuit of the conventional vibration damping structure can be arbitrarily arranged at the connection position of the first oil cylinder 6 according to the needs of convenient installation and layout, without changing the flow of the hydraulic oil in the first oil cylinder 6 to the first oil-gas chamber 1 when the first oil cylinder rod 5 moves upward relative to the first oil cylinder 6, and without changing the flow of the hydraulic oil in the first oil-gas chamber 1 to the first oil cylinder 6 when the first oil cylinder rod 5 moves downward relative to the first oil cylinder 6. Similarly, the working oil circuit of the anti-resonance vibration damping structure can also be arbitrarily arranged at the connection position of the second oil cylinder 12 according to the needs of convenient installation and layout.

[0036] When the car is driving, at the moment when the wheel 4 starts to vibrate upward, the body 16 has no time to move. The wheel 4 compresses the first oil cylinder 6 upward to push it upward, and compresses the coil spring 17 and the second oil cylinder 12 upward to push the body 16 upward. During this movement, when the upward vibration of the wheel 4 passes through the traditional vibration reduction structure, a very small part of the hydraulic oil in the rodless cavity of the first oil cylinder 6 flows into the rod cavity of the first oil cylinder 6 through the oil guide groove 21. Most of the hydraulic oil in the rodless cavity of the first oil cylinder 6 flows to the first oil-gas chamber 1 through the parallel oil circuit composed of the first throttle valve 19, the second throttle valve 39 and the sixth solenoid valve 38 in the first oil cylinder rod 5 with its rod body cross-sectional area as the effective working area. Most of the hydraulic oil flows into the first oil-gas chamber 1, causing the gas therein to be compressed, thereby increasing the gas pressure in the first oil-gas chamber 1. The pressure is transmitted to the first oil cylinder rod 5. The first oil cylinder rod 5 outputs an upward elastic force to complete a vibration isolation of the upward vibration of the wheel 4. At the same time, the parallel oil circuit composed of the first throttle valve 19, the second throttle valve 39 and the sixth solenoid valve 38 generates damping to reduce the upward vibration of the wheel 4. When the upward vibration of the wheel 4 after isolation and reduction by the traditional vibration reduction structure is transmitted to the cylinder body of the second oil cylinder 12, The third mass of the suspension absorbs the upward vibration kinetic energy of the wheel 4; when the wheel 4 vibrates upward and passes through the anti-resonance vibration reduction structure after the kinetic energy is absorbed by the third mass of the suspension, the coil spring mounted lower bracket 18 on the second oil cylinder 12 pushes the vehicle body 16 to move upward through the coil spring 17 and the coil spring mounted upper bracket 14. At the same time, the second oil cylinder 12 compresses the hydraulic oil in its rodless chamber through the cylinder body. A very small part of the hydraulic oil in the rodless chamber flows to the rod chamber of the second oil cylinder 12 through the oil guide groove 21, but most of the hydraulic oil takes the cross-sectional area of ​​the rod body of the second oil cylinder rod 13 as the effective working area and flows to the second oil-gas chamber 11 through the parallel oil circuit composed of the inertia coil 8, the intelligent control switch 10 and the first solenoid valve 9. Most of the hydraulic oil flows into the second oil-gas chamber 11, causing the gas therein to be compressed, thereby increasing the gas pressure in the second oil-gas chamber 11. The pressure is transmitted to the second oil cylinder rod 13, causing the second oil cylinder rod 12 to output an upward elastic force to the vehicle body 16, and at the same time flows through the inertia coil 8, The parallel oil circuit composed of the intelligent control switch 10 and the first solenoid valve 9 generates damping and inertia. The damping and inertia, together with the stiffness generated by the elastic force output to the vehicle body 16 by the coil spring 17 and the second cylinder rod 13, perform an anti-resonance vibration reduction on the upward vibration of the wheel 4, and ultimately significantly attenuate the upward vibration input of the wheel 4 to the vehicle body 16.

[0037] At the moment when the wheel 4 starts to vibrate downward, the vehicle body 16 has no time to move. The wheel 4 stretches the first oil cylinder 6 downward, and the third mass of the suspension moves downward, causing the third mass of the suspension to generate an inertial force. When the third mass of the suspension moves downward, the coil spring 17 and the second oil cylinder 12 are stretched downward, driving the vehicle body 16 to move downward. During this movement, when the downward vibration of the wheel 4 passes through the traditional vibration reduction structure, the hydraulic oil in the rod chamber of the first oil cylinder 6 flows to the rodless chamber of the first oil cylinder 6 through the oil guide groove 21, and most of the hydraulic oil flowing into the rodless chamber of the first oil cylinder 6 Because the hydraulic oil in the first oil-gas chamber 1 is pressed into the first oil cylinder rod 5 through the first throttle valve 19, the second throttle valve 39 and the sixth solenoid valve 38 parallel oil circuit with the cross-sectional area of ​​the rod body as the effective working area under the action of the gas pressure therein, most of the hydraulic oil flows out of the first oil-gas chamber 1, causing the volume of the gas therein to expand and thus reducing the gas pressure in the first oil-gas chamber 1. The pressure is transmitted to the first oil cylinder rod 5, causing the first oil cylinder rod 5 to output a downward elastic force to the third mass of the suspension, thereby completing a vibration isolation of the downward vibration of the wheel 4. At the same time, the first throttle valve 19, the second throttle valve 39 and the sixth solenoid valve 38 parallel oil circuit generate damping to reduce the downward vibration of the wheel 4. When the downward vibration of the wheel 4 after isolation and reduction by the traditional vibration reduction structure is transmitted to the cylinder body of the second oil cylinder 12 and the third mass of the suspension, The third mass of the suspension absorbs the kinetic energy of the downward vibration of the wheel 4; when the wheel 4 vibrates downward after the kinetic energy is absorbed by the third mass of the suspension and passes through the anti-resonance vibration reduction structure, the coil spring mounted lower bracket 18 on the second oil cylinder 12 drives the vehicle body 16 to move downward through the coil spring 17 and the coil spring mounted upper bracket 14. At the same time, the second oil cylinder 12 moves downward through the cylinder body, so that the hydraulic oil in the rod cavity of the second oil cylinder 12 flows to the rodless cavity of the second oil cylinder 12 through the oil guide groove 21 on the second oil cylinder rod 13. Most of the hydraulic oil flowing into the rodless cavity of the second oil cylinder 12 is hydraulically discharged by the hydraulic oil in the second oil-gas chamber 11 under the action of the gas pressure therein with the cross-sectional area of ​​the rod body of the second oil cylinder rod 13 being the cross-sectional area of ​​the second oil cylinder rod 13. The effective working area is pressed through the parallel oil circuit consisting of the inertia coil 8, the intelligent control switch 10 and the first solenoid valve 9. Most of the hydraulic oil flows out of the second oil-gas chamber 11, causing the volume of the gas therein to expand and thus reducing the gas pressure in the second oil-gas chamber 11. The pressure is transmitted to the second cylinder rod 13, causing the second cylinder rod 13 to output a downward elastic force to the vehicle body 16. At the same time, the parallel oil circuit consisting of the inertia coil 8, the intelligent control switch 10 and the first solenoid valve 9 generates damping and inertia. The damping and inertia, together with the stiffness generated by the coil spring 17 and the second cylinder rod 13 outputting the downward elastic force to the vehicle body 16, and the anti-resonance vibration reduction of the downward vibration of the wheel 4 are performed, which ultimately greatly attenuates the downward vibration input of the wheel 4 to the vehicle body 16.

[0038] like Figure 4As shown, the height-adjustable suspension height adjustment device 2 comprises a first height-adjusting oil and gas cylinder 37, a third solenoid valve 25, a high-pressure gas storage tank 26, a first non-return valve 28, an electric air compressor unit 29 and a low-pressure gas storage tank 32 connected in series in sequence, and the low-pressure gas storage tank 32 is connected to an air filter 30 via a second non-return valve 31. The first height-adjusting oil and gas cylinder 37 and the third solenoid valve 25 are connected in series at both ends in parallel with a second height-adjusting oil and gas cylinder 36 and a fifth solenoid valve 35; one side of the piston of the first height-adjusting oil and gas cylinder 37 and the second height-adjusting oil and gas cylinder 36 is an oil cylinder, and the other side is an air cylinder.

[0039] The cylinder outlets of the first height-adjusting oil-gas cylinder 37 and the second height-adjusting oil-gas cylinder 36 are connected in parallel and are respectively connected to the first oil-gas chamber 1 and the first oil cylinder 6 by hydraulic pipelines. The cylinder inlet of the first height-adjusting oil-gas cylinder 37 is connected in series with the third solenoid valve 25. The normally open second solenoid 24 is bypassed on the air path between the cylinder inlet of the first height-adjusting oil-gas cylinder 37 and the third solenoid valve 25, and the inlet of the second solenoid 24 is connected. The cylinder inlet of the second height-adjusting oil-gas cylinder 36 is connected in series with the fifth solenoid valve 35. The normally open fourth solenoid 27 is bypassed on the air path between the cylinder inlet of the second height-adjusting oil-gas cylinder 36 and the fifth solenoid valve 35, and the inlet of the fourth solenoid 27 is connected. The outlets of the second solenoid 24 and the fourth solenoid 27 are connected to the low-pressure gas storage tank 32 via an air pipe.

[0040] The air filter 30, the second one-way valve 31, the low-pressure air tank 32 and the electric air compressor unit 29 are connected in series through the air pipe, and the air filter 30, the second one-way valve 31 and the low-pressure air tank 32 are connected in series through the air pipe to form the air supply pipeline of the electric air compressor unit 29. The air path between the third solenoid valve 25 and the one-way valve 28 is externally connected with a pressure sensor 33 for detecting the air pressure there. The second one-way valve 28 is used to prohibit the compressed air from flowing back to the electric air compressor unit 29, and the first one-way valve 31 is used to directly release the compressed air discharged from the first height adjustment oil and gas cylinder 37 and the second height adjustment oil and gas cylinder 36 into the atmosphere. The pressure sensor 33 is connected to the controller 34 through a signal line, and the controller 34 is connected to the electric air compressor unit 29, the second solenoid valve 24, the third solenoid valve 25, the fourth solenoid valve 27 and the fifth solenoid valve 35 through control signal lines.

[0041] The volumes of the first height-adjusting oil-gas cylinder 37 and the second height-adjusting oil-gas cylinder 36 are not equal, and the sum of the volumes of the first height-adjusting oil-gas cylinder 37 and the second height-adjusting oil-gas cylinder 36 needs to meet the requirements for the vehicle wheel to escape from a pit. The present invention only takes the case where the volume of the second height-adjusting oil-gas cylinder 36 is greater than the volume of the first height-adjusting oil-gas cylinder 37 as an example. Figure 4 It is shown that the volume of the second height-adjusting oil-gas cylinder 36 is twice that of the first height-adjusting oil-gas cylinder 37 .

[0042] like Figure 4 As shown, when the car is in the initial state of parking and the engine is not started, the height of the suspension and the vehicle body is in the initially set low height state, that is, the suspension height adjustment device 2 is in the initial setting, and the first height adjustment oil cylinder 37 and the second height adjustment oil cylinder 36 are both in the non-empty state by default, and the controller 34 controls the second solenoid valve 24 to open, the third solenoid valve 25 to close, the fourth solenoid valve 27 to open, and the fifth solenoid valve 35 to close. The first height adjustment oil cylinder 37 and the second height adjustment oil cylinder 36 are not working, and the suspension height adjustment device 2 does not supply oil to the first oil cylinder 6 in the traditional vibration reduction structure. When the car engine is started, the controller 34 controls the electric air compressor unit 29 to work. At this time, if the pressure in the low-pressure air storage tank 32 is less than the atmospheric pressure, the air flows through the air filter 30 and the second one-way valve 31, and the electric air compressor unit 29 pressurizes to produce compressed air. If the pressure in the low-pressure air storage tank 32 is greater than the atmospheric pressure, the low-pressure air storage tank 32 supplies air to the electric air compressor unit 29 to pressurize and produce compressed air. The compressed air enters the high-pressure gas storage tank 26 for storage through the first one-way valve 28. At this time, when the pressure sensor 33 detects that the pressure of the high-pressure gas storage tank 26 reaches the preset upper limit of the control, the electric air compressor unit 29 is turned off, the charging of the high-pressure gas storage tank 26 is stopped, and the working preparation of the suspension height adjustment device 2 is completed. When the suspension height adjustment device 2 works, causing the pressure of the high-pressure gas storage tank 26 to reach the preset lower limit of the control, the electric air compressor unit 29 is turned on to pressurize and charge the high-pressure gas storage tank 26, until the pressure sensor 33 detects that the pressure of the high-pressure gas storage tank 26 reaches the preset upper limit of the control, the electric air compressor unit 29 is turned off, and the charging of the high-pressure gas storage tank 26 is stopped, and the cycle is repeated.

[0043] When the car engine is started and the driver selects the city driving mode, the controller 34 controls the second solenoid valve 24 to be closed, the fourth solenoid valve 27 to be closed, and the fifth solenoid valve 35 to be closed, and the third solenoid valve 25 is opened. The compressed air enters the cylinder of the first height-adjusting oil-gas cylinder 37 from the high-pressure gas tank 26 through the third solenoid valve 25. The first height-adjusting oil-gas cylinder 37 with a smaller volume works, and the hydraulic oil is emptied through its inner piston and input into the first oil cylinder 6, so that the first oil cylinder 6 passes through the second oil cylinder 12, the second oil cylinder rod 13 and the vehicle body 16 to move up relative to the first oil cylinder rod 5 and the wheel 4, so that the vehicle body 4 is in a normal height state, so as to avoid the pressure reduction of the first oil-gas chamber 1 caused by low temperature, resulting in a reduction in the suspension height. At this time, the suspension height adjustment device 2 controls the second height-adjusting oil-gas cylinder 36 to be in a non-emptying state.

[0044] When the driver selects the bad road driving mode, the controller 34 controls the second solenoid valve 24 to be closed, the third solenoid valve 25 to be closed, and the fourth solenoid valve 27 to be closed, and the fifth solenoid valve 35 to be opened. The compressed air enters the cylinder of the second height adjustment oil and gas cylinder 36 from the high-pressure air storage tank 26 through the fifth solenoid valve 35. The second height adjustment oil and gas cylinder 36 with a larger volume works, and its internal hydraulic oil is emptied through its inner piston and input into the first oil cylinder 6, so that the first oil cylinder 6 leads the second oil cylinder 12, the second oil cylinder rod 13 and the vehicle body 16 to move up relative to the first oil cylinder rod 5 and the wheel 4. Since the volume of the second height adjustment oil and gas cylinder 36 is larger than that of the first height adjustment oil and gas cylinder 37, the vehicle body 4 is in a higher height state than the normal height, so as to avoid the suspension limit being hit and affecting the riding comfort. At this time, the suspension height adjustment device 2 controls the first height adjustment oil and gas cylinder 37 to be in a non-emptying state.

[0045] When the driver selects the escape mode, the controller 34 controls the second solenoid valve 24 to close and the fourth solenoid valve 27 to close, and opens the third solenoid valve 25 and the fifth solenoid valve 35. The compressed air enters the cylinder of the first height-adjusting oil-gas cylinder 37 from the high-pressure gas tank 26 through the third solenoid valve 25, and the hydraulic oil therein is emptied and input to the first oil cylinder 6 through its inner piston. At the same time, the compressed air also enters the cylinder of the second height-adjusting oil-gas cylinder 36 from the high-pressure gas tank 26 through the fifth solenoid valve 35, and the hydraulic oil therein is also emptied and input to the first oil cylinder 6 through its inner piston. That is, the first height-adjusting oil-gas cylinder 37 and the second height-adjusting oil-gas cylinder 3 work synchronously, and together the first oil cylinder 6 leads the second oil cylinder 12, the second oil cylinder rod 13 and the vehicle body 16 to move upward relative to the first oil cylinder rod 5 and the wheel 4, so that the height of the vehicle body 4 is at the highest height state for escape, so that the car wheels can drive out of the pit and escape.

[0046] When the first height-adjusting oil and gas cylinder 37 needs to recover hydraulic oil to lower the suspension height, the controller 34 controls the third solenoid valve 25 to close, the second solenoid valve 24 to open, the fourth solenoid valve 27 and the fifth solenoid valve 35 to remain in their original state, and the compressed air in the cylinder of the first height-adjusting oil and gas cylinder 37 flows into the low-pressure gas storage tank 32 for storage through the second solenoid valve 24 to achieve pressurized exhaust gas energy recovery; at the same time, the hydraulic oil in the first oil cylinder 6 flows back to the first height-adjusting oil and gas cylinder 37 to achieve suspension stiffness reduction. When the second height-adjusting oil and gas cylinder 36 needs to recover hydraulic oil to lower the suspension height, the controller 34 controls the fifth solenoid valve 35 to close, the fourth solenoid valve 27 to open, the second solenoid valve 24 and the third solenoid valve 25 to remain in their original state, and the compressed air in the cylinder of the second height-adjusting oil and gas cylinder 36 flows into the low-pressure gas storage tank 32 for storage through the fourth solenoid valve 27 to achieve pressurized exhaust gas energy recovery, and at the same time, the hydraulic oil in the first oil cylinder 6 flows back to the second height-adjusting oil and gas cylinder 36 to achieve suspension stiffness reduction. Since the low-pressure air storage tank 32 is used to recover the compressed air used to operate the first height-adjusting oil-gas cylinder 37 and the second height-adjusting oil-gas cylinder 36, in addition to recovering energy and saving energy, the pressure difference between the air outlet and the air inlet of the electric air compressor unit 29 can also be reduced. Without increasing its power, the speed at which the electric air compressor unit 29 provides high-pressure compressed air can be increased.

[0047] Four height-adjustable intelligent self-powered active suspensions according to the present invention are installed on the car. When the car turns, the two controllers 34 in the two height-adjustable intelligent self-powered active suspensions according to the present invention on the inner side of the car turn respectively control their own two third solenoid valves 25 and two fifth solenoid valves 35 to close, and then control their own two second solenoid valves 24 and two fourth solenoid valves 27 to open, and the compressed air of the cylinders of the two first height-adjusting oil and gas cylinders 37 flows into the corresponding low-pressure gas storage tank 32 for storage through the corresponding second solenoid valves 24, and the compressed air of the cylinders of the corresponding second height-adjusting oil and gas cylinders 36 flows into the corresponding low-pressure gas storage tank 32 for storage through the corresponding fourth solenoid valves 27, and the hydraulic oil in the corresponding first oil cylinder 6 flows back to the corresponding first height-adjusting oil and gas cylinder 37 and the second height-adjusting oil and gas cylinder 36, so that the suspension height adjustment device 2 controls the corresponding two first height-adjusting oil and gas cylinders 37 and the second height-adjusting oil and gas cylinders 36 to be in a non-emptying state, that is, the two parallel adjustment oil and gas cylinders do not work, and the two suspensions on the inner side of the car turn are reduced to the minimum. At the same time, the controller 34 of the two suspensions turned to the outside of the vehicle first controls the corresponding two second solenoid valves 24 and two fourth solenoid valves 27 to be closed, and then controls the corresponding two third solenoid valves 25 and two fifth solenoid valves 35 to be opened, and the compressed air enters the cylinder of the respective first height adjustment oil cylinder 37 through the respective third solenoid valve 25 from the corresponding high-pressure gas tank 26, and the hydraulic oil therein is emptied through the inner piston and input to the respective first oil cylinder 6. At the same time, the compressed air also enters the cylinder of the respective second height adjustment oil cylinder 36 from the high-pressure gas tank 26 through the respective fifth solenoid valve 35, and the hydraulic oil therein is also emptied through the inner piston and input to the respective first oil cylinder 6, so that the respective first oil cylinder 6 drives the respective second oil cylinder 12, the second oil cylinder rod 13 and the vehicle body 16 to move upward relative to the respective first oil cylinder rod 5 and the wheel 4, so that the height of the two suspensions of the present invention turned to the outside of the vehicle is in the highest height state of getting out of trouble, so that the vehicle body generates a lateral offset distance of the center of gravity of the vehicle body in the opposite direction of the roll moment caused by the centrifugal force of the vehicle steering, so as to improve the rollover stability of the vehicle. Therefore, the present invention adopts compressed air to operate the suspension height adjustment device 2, which can improve the rollover stability of the car. It can realize pre-charging of compressed air in advance, that is, pre-storing energy in advance. Compared with the conventional electric active anti-roll bar without energy storage assistance, it can greatly accelerate the suspension height adjustment speed to improve the rollover stability of the car.

Claims

1. An intelligent self-powered active suspension with multi-level adjustable height, wherein the conventional vibration reduction structure and the anti-resonance vibration reduction structure each have a cylinder, and the cylinder rod moves up and down along the axial direction in the cylinder, and the characteristics are: The rod ends of the oil cylinder rod extending into the oil cylinder are guide ends for dividing the oil cylinder into a rodless chamber and a rod chamber, and the guide ends are composed of a guide (23), a screw (22) and a nut (20). The screw (22) is an externally threaded rod extending from the rod body of the oil cylinder rod in the axial direction and having an outer diameter smaller than the rod body. The guide (23) is a cylindrical shape that is sleeved on the outside of the screw (22) through an internal thread. The nut (20) matches the screw (22), and there is no seal between the outer wall of the guide (23) and the inner wall of the oil cylinder. The screw (22) and the oil cylinder rod are provided with an oil guide groove (21) that passes through the rodless chamber and the rod chamber. The suspension height adjustment device (2) supplies oil to the oil cylinder of the conventional vibration reduction structure and allows the oil to flow back, so as to adjust the vehicle body to four height states: low height, normal height, high height and maximum height for escape. The suspension height adjustment device (2) comprises a first height adjustment oil-gas cylinder (37) and a second height adjustment oil-gas cylinder (36) of unequal volumes; the first height adjustment oil-gas cylinder (37), a third solenoid valve (25), a high-pressure gas storage tank (26), a first non-return valve (28), an electric air compressor unit (29) and a low-pressure gas storage tank (32) are sequentially connected in series; the first height adjustment oil-gas cylinder (37) and the third solenoid valve (25) are connected in series at both ends thereof; the second height adjustment oil-gas cylinder (36) and the fifth solenoid valve (35) are connected in series in parallel; the oil cylinder outlets of the first height adjustment oil-gas cylinder (37) and the second height adjustment oil-gas cylinder (36) are connected in parallel to the first oil-gas chamber (1) and the second oil-gas chamber (1) by hydraulic pipelines. The first oil cylinder (6), the cylinder inlet of the first height-adjusting oil and gas cylinder (37) are connected to the inlet of the second solenoid valve (24), the cylinder inlet of the second height-adjusting oil and gas cylinder (36) is connected to the inlet of the fourth solenoid valve (27), and the outlets of the second solenoid valve (24) and the fourth solenoid valve (27) are connected to the low-pressure air storage tank (32) via an air pipe; the controller (34) is connected to the electric air compressor unit (29), the second solenoid valve (24), the third solenoid valve (25), the fourth solenoid valve (27), and the fifth solenoid valve (35) via control lines; the air filter (30), the second one-way valve (31) and the low-pressure air storage tank (32) are connected in series via an air pipe to form an air supply pipeline of the electric air compressor unit (29); When the vehicle is parked and the engine is not started, the controller (34) controls the second solenoid valve (24) and the fourth solenoid valve (27) to open, the third solenoid valve (25) and the fifth solenoid valve (35) to close, the first height adjustment oil cylinder (37) and the second height adjustment oil cylinder (36) to stop working, and the vehicle body is in a low height state; In the urban driving mode, the controller (34) controls the second solenoid valve (24), the fourth solenoid valve (27) and the fifth solenoid valve (35) to be closed, and the third solenoid valve (25) to be opened, and compressed air enters the first height adjustment oil cylinder (37) from the high-pressure air storage tank (26) through the third solenoid valve (25), the first height adjustment oil cylinder (37) with a smaller volume works, the hydraulic oil is emptied and input into the first oil cylinder (6), and the vehicle body is in a normal height state; In the bad road driving mode, the controller (34) controls the second solenoid valve (24), the third solenoid valve (25) and the fourth solenoid valve (27) to be closed, and the fifth solenoid valve (35) to be opened, and the compressed air enters the second height adjustment oil cylinder (36) from the high-pressure air storage tank (26) through the fifth solenoid valve (35), the second height adjustment oil cylinder (36) with a larger volume works, the hydraulic oil is emptied and input into the first oil cylinder (6), and the vehicle body is in a higher height state; In the escape mode, the controller (34) controls the second solenoid valve (24) and the fourth solenoid valve (27) to close, the third solenoid valve (25) and the fifth solenoid valve (35) to open, the first height adjustment oil and gas cylinder (37) and the second height adjustment oil and gas cylinder (36) to work synchronously, and the vehicle body height is in the highest height state for escape.

2. The multi-level height-adjustable intelligent self-powered active suspension according to claim 1 is characterized in that: The first oil cylinder (6) of the conventional vibration reduction structure is connected in series via a hydraulic pipeline to a suspension height adjustment device (2), a first throttle valve (19), a second throttle valve (39), and a parallel oil circuit formed by a sixth solenoid valve (38), and a first oil-gas chamber (1); the second oil cylinder (12) of the anti-resonance vibration reduction structure is connected in series via a hydraulic pipeline to an inertia coil (8), an intelligent control switch (10), and a second oil-gas chamber (11); two ends of the intelligent control switch (10) are connected in parallel to the first solenoid valve (9); and the intelligent control switch (10) is connected to the first solenoid valve (9) and the sixth solenoid valve (38) respectively via control lines.

3. The multi-level height-adjustable intelligent self-powered active suspension according to claim 2 is characterized in that: The additional mass block (7) is fixedly connected to the cylinder bodies of the first oil cylinder (6) and the second oil cylinder (12); the first oil-gas chamber (1) and the second oil-gas chamber (11) are fixedly connected to the cylinder bodies of the first oil cylinder (6) and the second oil cylinder (12), and together with the additional mass block (7) and the first oil cylinder (6) and the second oil cylinder (12) serve as the third mass of the suspension.

4. The multi-level height-adjustable intelligent self-powered active suspension according to claim 2 is characterized in that: When the car is traveling at high speed on a good road surface, the intelligent control switch (10) controls the first solenoid valve (9) and the sixth solenoid valve (38) to be closed synchronously; when the car is traveling on a bad road surface, the intelligent control switch 10 controls the first solenoid valve (9) and the sixth solenoid valve (38) to be opened synchronously.

5. The multi-level height-adjustable intelligent self-powered active suspension according to claim 2 is characterized by: When the vehicle is running, the wheels vibrate upward, and a small portion of the hydraulic oil in the rodless chamber of the first oil cylinder (6) flows to the rod chamber through the oil guide groove (21), and the vast majority of the hydraulic oil flows to the first oil-gas chamber (1) with the cross-sectional area of ​​the oil cylinder rod as the effective working area, thereby increasing the gas pressure therein; a small portion of the hydraulic oil in the rodless chamber of the second oil cylinder (12) flows to the rod chamber through the oil guide groove (21), and the vast majority of the hydraulic oil flows to the second oil-gas chamber (11) with the cross-sectional area of ​​the oil cylinder rod as the effective working area, thereby increasing the gas pressure therein. The force increases; when the wheel vibrates downward, the hydraulic oil in the rod chamber of the first oil cylinder (6) flows to the rodless chamber through the oil guide groove 21, and most of the hydraulic oil in the rodless chamber flows out of the first oil-gas chamber (1) with the cross-sectional area of ​​the cylinder rod as the effective working area, thereby reducing the gas pressure inside the chamber; the hydraulic oil in the rod chamber of the second oil cylinder (12) flows to the rodless chamber through the oil guide groove (21), and most of the hydraulic oil in the rodless chamber flows out of the second oil-gas chamber (11) with the cross-sectional area of ​​the cylinder rod as the effective working area, thereby reducing the gas pressure inside the chamber.

6. The multi-level height-adjustable intelligent self-powered active suspension according to claim 1 is characterized by: When the first height-adjusting oil-gas cylinder (37) needs to recover hydraulic oil to lower the height of the suspension, the controller (34) controls the third solenoid valve (25) to close and the second solenoid valve (24) to open, so that the hydraulic oil in the first oil cylinder (6) flows back to the first height-adjusting oil-gas cylinder (37); when the second height-adjusting oil-gas cylinder (36) needs to recover hydraulic oil to lower the height of the suspension, the controller (34) controls the fifth solenoid valve (35) to close and the fourth solenoid valve (27) to open, so that the hydraulic oil in the first oil cylinder (6) flows back to the second height-adjusting oil-gas cylinder (36).

7. The multi-level height-adjustable intelligent self-powered active suspension according to claim 1 is characterized by: When the vehicle turns, the two controllers (34) in the two suspensions turned inward respectively control their respective third solenoid valves (25) and fifth solenoid valves (35) to close and the second solenoid valves (24) and fourth solenoid valves (27) to open, and the two suspensions turned inward are lowered to the lowest position; at the same time, the controllers (34) of the two suspensions turned outward control their respective second solenoid valves (24) and fourth solenoid valves (27) to close and the third solenoid valves (25) and fifth solenoid valves (35) to open, and the two suspensions turned outward are in the highest height state for escaping from the trouble.

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