Built-in damper control solenoid and control method thereof

Abstract

The application belongs to the technical field of built-in shock absorber damping control electromagnetic valves, and also relates to a control method of the built-in shock absorber damping control electromagnetic valve. The limiting ring (7) and the throttle baffle (8) are pressed into the valve sleeve subassembly (4) at one end port, the limiting ring (7) and the throttle baffle (8) clamp the outer edge of the one-way valve piece (9) to limit, the center of the throttle baffle (8) is provided with a center flow hole (S2), the outer ring of the throttle baffle (8) is provided with a plurality of always-open holes (S3), and the valve piece area (S1) of the one-way valve piece (9) is greater than the center flow hole area A of the center flow hole (S2) of the throttle baffle (8). The built-in shock absorber damping control electromagnetic valve utilizes the throttle baffle and the one-way valve piece to realize the control of the flow area of the electromagnetic valve, can guarantee the vehicle smoothness under complex and harsh road conditions, improves the vehicle driving experience, and can be applied to more kinds of vehicle models.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle shock absorbers, and more specifically, relates to a built-in shock absorber damping control solenoid valve. The present invention also relates to a control method of the built-in shock absorber damping control solenoid valve. Background Art

[0002] Shock absorbers are used to absorb and modulate road shocks. They are widely used in vehicle vibration reduction, attenuating frame and body vibrations, improving ride smoothness and providing a pleasant driving experience. While shock-absorbing springs filter road vibrations, they also experience reciprocating motion. Shock absorbers are designed to suppress this spring bouncing. The shock absorber is filled with oil and has two inner and outer chambers. The oil flows through a pore connecting the two chambers. A damping solenoid valve is installed at the position that controls the flow of oil in the pore to control the damping force of the shock absorber. Currently, built-in shock absorbers on the market use current to control the damping force provided by the solenoid valve. However, the adjustable damping force range of the solenoid valve is limited for the same current, making it difficult to ensure smooth ride in complex and harsh road conditions.

[0003] The prior art includes a technology titled "Continuously Adjustable Damping Vehicle Suspension Shock Absorber" with publication (announcement) number "CN115059717B." This technology discloses a continuously adjustable damping vehicle suspension shock absorber comprising an oil reservoir, a working cylinder, and a piston rod assembly disposed within the working cylinder. A control valve assembly is disposed within the oil reservoir, located between the two cylinders. The control valve assembly comprises a mounting sleeve mounted on the working cylinder and at least one valve assembly mounted on the mounting sleeve. The mounting sleeve defines a control chamber for mounting the valve assembly, as well as first and second channels communicating with the control chamber. The first channel communicates with the oil reservoir chamber at one end, and the second channel communicates with the working cylinder chamber at one end. The valve assembly is disposed within the control chamber and controls the flow between the first and second channels. Compared to existing shock absorber designs with external / internal solenoid valves, this design addresses the issues of large layout space requirements, the need for an additional intermediate cylinder, or the increased length that hinders short-stroke applications. The overall structure is simpler and more compact, offering improved stability and reliability.

[0004] However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a built-in shock absorber damping control solenoid valve with a simple structure is provided, which can expand the damping force adjustment range of the solenoid valve after the solenoid valve is opened under the same current, and can improve the vehicle driving experience under complex and harsh road conditions where it is difficult to ensure vehicle smoothness. The solenoid valve can be applied to more types of vehicle models.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0007] The present invention is a built-in shock absorber damping control solenoid valve, wherein a limit ring and a throttle baffle are pressed onto one end port of a valve sleeve subassembly, the limit ring and the throttle baffle clamp the outer edge of the one-way valve disc to limit the position, a central flow hole is provided at the center of the throttle baffle, and a plurality of normally open holes are provided on the outer ring of the throttle baffle, the valve disc area of ​​the one-way valve disc is larger than the central flow hole area A of the central flow hole of the throttle baffle, and the valve disc area of ​​the one-way valve disc is set to be able to block the central flow hole of the throttle baffle and the normally open hole of the throttle baffle when not under hydraulic working conditions. The hole is an unobstructed structure; when the left side of the limit ring and the throttle baffle is the P port, the central flow hole area A of the central flow hole of the throttle baffle is blocked by the one-way valve disc under the action of hydraulic pressure, and the medium can only flow to the T port located on the other side of the limit ring through the normal through hole area B of the normal through hole of the throttle baffle; when the right side of the limit ring and the throttle baffle is the P port, the hydraulic pressure pushes the one-way valve disc to deform, the central flow hole of the throttle baffle opens, and the flow area of ​​the throttle baffle increases, which is the sum of the central flow hole area and the normal through hole area.

[0008] The valve sleeve subassembly is internally installed with a magnetic core subassembly, a magnetic core shaft, a valve core, a valve port, a limiting ring, a one-way valve plate, a throttling baffle, and externally installed with a solenoid subassembly and a rear yoke sleeve.

[0009] The solenoid sub-assembly is installed in the valve sleeve sub-assembly, the magnetic core sub-assembly is installed in the valve sleeve sub-assembly, the magnetic core shaft passes through the magnetic core sub-assembly and the rear yoke sleeve; the outer ring of the magnetic core shaft is sleeved with a spring.

[0010] The limit ring and throttle baffle are respectively connected with the valve sleeve sub-assembly in interference fit. The inside of the one-way valve disc is configured to deform only toward the position of the limit ring. The maximum deformation position of the one-way valve disc is limited by the limit ring.

[0011] The valve sleeve subassembly is provided with a side hole.

[0012] The built-in shock absorber damping control solenoid valve is configured to be a structure capable of switching between a restoring state and a compression state by providing different pressure controls.

[0013] The damping force of the recovery stroke of the solenoid valve after opening is controlled by the flow area of ​​the throttle baffle's normal holes, including changing the number, size, shape of the normal holes and the relative position relationship with the one-way valve plate to control the flow area of ​​the throttle baffle's normal holes.

[0014] The minimum flow area of ​​the compression stroke is controlled by the flow area of ​​the center hole of the throttling baffle and the limit height of the limit ring, thereby controlling the damping force of the compression stroke after the solenoid valve is opened.

[0015] The present invention also relates to a control method for a built-in shock absorber damping control solenoid valve with simple steps. The method expands the damping force adjustment range of the solenoid valve after the solenoid valve is opened under the same current, thereby improving the vehicle driving experience while ensuring vehicle smoothness under complex and harsh road conditions. The method can be applied to a wider variety of vehicle models. The control steps of the control method for the built-in shock absorber damping control solenoid valve are as follows:

[0016] When the built-in shock absorber damping control solenoid valve is in the restored state:

[0017] During the return stroke, the hydraulic pressure overcomes the combined force of the spring and electromagnetic forces, causing the magnetic core shaft, valve port, and valve core to move leftward, and the solenoid valve opens to create a flow channel.

[0018] S2. As the flow of medium through the solenoid valve increases, the hydraulic pressure gradually increases, causing the gap between the valve port and the limit ring to gradually expand, and the damping force provided by the solenoid valve to rise relatively slowly. At this time, the left side of the limit ring and the throttle baffle is the P port. When the gap between the valve port and the limit ring increases to the normal through hole area B of the throttle baffle, the minimum throttling area of ​​the solenoid valve is fixed to the normal through hole area of ​​the throttle baffle. At this time, the flow of medium through the solenoid valve causes the hydraulic pressure to rise rapidly, which can provide a greater restoring damping force for the shock absorber.

[0019] When the built-in shock absorber damping control solenoid valve is in a compressed state:

[0020] S1. During the compression stroke, the right side of the limit ring and throttle baffle is the P port. After the medium passes through the central flow hole and the normal flow hole of the throttle baffle, it builds up hydraulic pressure to push the valve core open, and the solenoid valve opens to create a flow channel.

[0021] S2. As the flow rate of the medium through the solenoid valve increases, the opening area between the valve port and the valve core gradually increases, and the damping force provided by the solenoid valve increases relatively slowly; when the opening area between the valve port and the valve core increases to the maximum area formed by the throttle baffle and the one-way valve plate, that is, the sum of the center flow hole area A and the normal flow hole area B, the interception area for medium circulation remains unchanged, and the increase in flow rate causes the hydraulic pressure to rise rapidly, which can provide a greater compression damping force for the shock absorber.

[0022] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0023] The internal shock absorber damping control solenoid valve described in the present invention improves the local structure of the internal shock absorber damping control solenoid valve. Specifically, based on the improvement of the valve sleeve subassembly, a limit ring is press-fitted onto one end of the valve sleeve subassembly; a one-way valve disc is then installed on the right side of the limit ring, and a throttle baffle is also press-fitted onto one end of the valve sleeve subassembly, with the throttle baffle being close to the one-way valve disc; the throttle baffle is provided with a special structure, namely, a central flow hole is provided at the center of the throttle baffle, and multiple regular through holes are provided on the outer ring of the throttle baffle. The one-way valve disc is provided with a special structure, namely, the valve disc area of ​​the one-way valve disc is larger than the central flow hole area A of the central flow hole of the throttle baffle. After the relevant components are assembled, the valve disc area of ​​the one-way valve disc can block the central flow hole of the throttle baffle when it is not under hydraulic working conditions, while the normally open hole of the throttle baffle is in an unobstructed state; when the built-in shock absorber damping control solenoid valve is in a working state, when the left side of the limit ring and the throttle baffle is the P port, under the action of liquid pressure, the central flow hole area A of the central flow hole of the throttle baffle is blocked by the one-way valve disc, and the medium can only flow to the T port located on the other side of the limit ring through the normally open hole area B of the normally open hole of the throttle baffle; when the right side of the limit ring and the throttle baffle is the P port, the liquid pressure pushes the one-way valve disc to deform, the central flow hole of the throttle baffle opens, and the flow area of ​​the throttle baffle increases, which is the sum of the central flow hole area A and the normally open hole area B; the maximum deformation position of the one-way valve disc is limited by the limit ring. The key improvements of the present invention are: 1. The change in damping force after the valve is opened is controlled by the one-way valve plate and the throttle baffle, thereby increasing the control range of the solenoid valve on the damping force of the shock absorber, and at the same time having the ability to independently adjust the damping force of the restoration and compression strokes; it is also possible to use other forms of one-way valve plate structures to achieve independent adjustment of the damping force of the restoration formation and compression stroke. 2. The damping force of the restoration stroke after the solenoid valve is opened is controlled by the flow area of ​​the permanent through hole of the throttle baffle. The means of modifying the flow area of ​​the permanent through hole include changing the number, size, shape of the permanent through hole and the relative position relationship with the one-way valve plate. 3. The minimum flow area of ​​the compression stroke is controlled by the area of ​​the central flow hole of the throttle baffle and the limit height of the limit ring, thereby controlling the damping force of the compression stroke after the solenoid valve is opened. 4. The one-way valve plate has a limiting structure in the deformation direction. Comprehensively improve the working performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following is a brief description of the contents and symbols in the drawings of this specification:

[0025] Figure 1 This is a schematic structural diagram of the damping control solenoid valve of the built-in shock absorber according to the present invention;

[0026] Figure 2 This is a schematic structural diagram of the one-way valve plate of the built-in shock absorber damping control solenoid valve of the present invention;

[0027] Figure 3This is a structural schematic diagram of the throttle baffle of the built-in shock absorber damping control solenoid valve of the present invention;

[0028] Figure 4 This is a structural schematic diagram of the left oil inlet circuit of the built-in shock absorber damping control solenoid valve of the present invention;

[0029] Figure 5 This is a structural schematic diagram of the right oil inlet circuit of the built-in shock absorber damping control solenoid valve of the present invention;

[0030] Figure 6 This is a schematic structural diagram of the return stroke oil circuit of the built-in shock absorber damping control solenoid valve of the present invention;

[0031] Figure 7 This is a schematic structural diagram of the compression stroke oil circuit of the built-in shock absorber damping control solenoid valve of the present invention;

[0032] The marks in the accompanying drawings are: 1. Back yoke sleeve; 2. Solenoid sub-assembly; 3. Magnetic core sub-assembly; 4. Valve sleeve sub-assembly; 5. Valve core; 6. Valve port; 7. Limiting ring; 8. Throttle baffle; 9. One-way valve disc; 10. Side hole; 11. Magnetic core shaft; 12. Spring; 13. Flow channel A; 14. Flow channel B; S1, Valve disc area; S2, Center flow hole; S3, Normal through hole. DETAILED DESCRIPTION

[0033] The following describes the embodiments with reference to the accompanying drawings to further explain in detail the specific embodiments of the present invention, such as the shapes, structures, mutual positions and connection relationships between the various components involved, the functions and working principles of the various components.

[0034] As attached Figure 1 -Attached Figure 7As shown, the present invention is a built-in shock absorber damping control solenoid valve, wherein a limit ring 7 and a throttle baffle 8 are press-fitted onto one end port of a valve sleeve subassembly 4, and the limit ring 7 and the throttle baffle 8 clamp the outer edge of a one-way valve disc 9 to limit the position, a central flow hole S2 is provided at the center of the throttle baffle 8, and a plurality of regular through holes S3 are provided on the outer ring of the throttle baffle 8, and a valve disc area S1 of the one-way valve disc 9 is larger than a central flow hole area A of the central flow hole S2 of the throttle baffle 8, and the valve disc area S1 of the one-way valve disc 9 is set to be able to block the central flow hole S2 of the throttle baffle 8 and the throttle baffle 8 when not under hydraulic working conditions. The normally open hole S3 is an unobstructed structure; when the left side of the limiting ring 7 and the throttle baffle 8 is the P port, the central flow hole area A of the central flow hole S2 of the throttle baffle 8 is blocked by the one-way valve plate 9 under the action of the liquid pressure, and the medium can only flow to the T port on the other side of the limiting ring 7 through the normal flow hole area B of the normally open hole S3 of the throttle baffle 8; when the right side of the limiting ring 7 and the throttle baffle 8 is the P port, the liquid pressure pushes the one-way valve plate 9 to deform, the central flow hole S2 of the throttle baffle 8 opens, and the flow area of ​​the throttle baffle 8 increases to the sum of the central flow hole area A and the normal flow hole area B. The above structure, in response to the deficiencies in the existing technology, proposes an improved technical solution. When setting the structure, the local structure of the built-in shock absorber damping control solenoid valve is improved. Specifically, the improvement is based on the valve sleeve sub-assembly 4, and the limit ring 7 is pressed into the port at one end of the valve sleeve sub-assembly 4; then the one-way valve plate 9 is installed in the limit ring 7, and at the same time, a throttle baffle 8 needs to be pressed into the port at one end of the valve sleeve sub-assembly 4, and the throttle baffle 8 is close to the one-way valve plate 9; the throttle baffle 8 is provided with a special structure, namely: a central flow hole S2 is provided in the center of the throttle baffle 8, and a plurality of regular through holes S3 are provided on the outer ring of the throttle baffle 8, and the one-way valve plate 9 is provided with a special structure, namely: the valve plate area S1 of the one-way valve plate 9 is larger than the central flow hole area A of the central flow hole S2 of the throttle baffle 8. After the relevant components are assembled, the valve disc area S1 of the one-way valve disc 9 can block the central flow hole S2 of the throttle baffle 8 when not under hydraulic working conditions, while the normal through hole S3 of the throttle baffle 8 is in an unobstructed state; when the built-in shock absorber damping control solenoid valve is in a working state, when the left side of the limit ring 7 and the throttle baffle 8 is the P port, under the action of hydraulic pressure, the central flow hole area A of the central flow hole S2 of the throttle baffle 8 is blocked by the one-way valve disc 9, and the medium can only flow to the T port located on the other side of the limit ring 7 through the normal through hole area B of the normal through hole S3 of the throttle baffle 8; when the right side of the limit ring 7 and the throttle baffle 8 is the P port, the hydraulic pressure pushes the one-way valve disc 9 to deform, the central flow hole S2 of the throttle baffle 8 opens, and the flow area of ​​the throttle baffle 8 increases to the sum of the central flow hole area A and the normal through hole area B; the maximum deformation position of the one-way valve disc 9 is limited by the limit ring 7.The key improvements of the present invention are: 1. The damping force change after the valve is opened is controlled by the one-way valve plate 9 and the throttle baffle 8, thereby increasing the control range of the solenoid valve on the damping force of the shock absorber, and at the same time having the ability to independently adjust the damping force of the restoration and compression strokes; it is also possible to use other forms of one-way valve structures to achieve independent adjustment of the damping force of the restoration and compression strokes. 2. The damping force of the restoration stroke after the solenoid valve is opened is controlled by the flow area of ​​the permanent hole of the throttle baffle 8. The means of modifying the flow area of ​​the permanent hole include changing the number, size, shape of the permanent hole and the relative position relationship with the one-way valve plate. 3. The minimum flow area of ​​the compression stroke is controlled by the area of ​​the central flow hole of the throttle baffle and the limit height of the limit ring, thereby controlling the damping force of the compression stroke after the solenoid valve is opened. 4. The deformation direction of the one-way valve plate has a limiting structure. Comprehensively improve the working performance. The built-in shock absorber damping control solenoid valve described in the present invention has a simple structure. After the solenoid valve is opened under the same current, the damping force adjustment range of the solenoid valve is expanded. It is difficult to ensure vehicle smoothness under complex and harsh road conditions, improves the vehicle driving experience, and can be applied to more types of vehicles.

[0035] The valve sleeve subassembly 4 is internally mounted with the magnetic core subassembly 3, magnetic core shaft 11, valve core 5, valve port 6, stop ring 7, check valve disc 9, throttle baffle 8, and externally mounted with the solenoid subassembly 2 and back yoke sleeve 1. The solenoid subassembly 2 is mounted within the valve sleeve subassembly 4, and the magnetic core subassembly 3 is mounted within the valve sleeve subassembly 4. The magnetic core shaft 11 passes through the magnetic core subassembly 3 and back yoke sleeve 1; a spring 12 is fitted around the outer ring of the magnetic core shaft 11. This structure defines the overall structure of the internal shock absorber damping control solenoid valve, ensuring reliable connection between the aforementioned components. The stop ring 7 and throttle baffle 8 each have an interference fit with the valve sleeve subassembly 4, ensuring a reliable connection. The check valve disc 9 is securely positioned between the stop ring 7 and throttle baffle 8. The limit ring 7 and throttle baffle 8 are respectively interference connected with the valve sleeve sub-assembly 4, and the inside of the one-way valve plate 9 is configured to deform only toward the position of the limit ring 7. The maximum deformation position of the one-way valve plate 9 is limited by the limit ring 7.

[0036] The valve sleeve sub-assembly 4 is provided with a side hole 10 .

[0037] The internal shock absorber damping control solenoid valve is designed to switch between a restoring state and a compression state by providing differential pressure control. The damping force during the restoring stroke of the solenoid valve after opening is controlled by the flow area of ​​the throttle baffle's opening holes. This is achieved by varying the number, size, and shape of the openings relative to the one-way valve disc to control the flow area of ​​the throttle baffle's opening holes. The minimum flow area during the compression stroke is controlled by adjusting the flow area of ​​the throttle baffle's center hole and the limit height of the stop ring, thereby controlling the damping force during the compression stroke of the solenoid valve after opening.

[0038] The present invention also relates to a control method for a built-in shock absorber damping control solenoid valve with simple steps. The method expands the damping force adjustment range of the solenoid valve after the solenoid valve is opened under the same current, thereby improving the vehicle driving experience while ensuring vehicle smoothness under complex and harsh road conditions. The method can be applied to a wider variety of vehicle models. The control steps of the control method for the built-in shock absorber damping control solenoid valve are as follows:

[0039] When the built-in shock absorber damping control solenoid valve is in the restored state:

[0040] S1. During the restoration stroke, the liquid pressure overcomes the combined force of the spring force and the electromagnetic force, causing the magnetic core shaft 11, the valve port 6 and the valve core 5 to move to the left, and the solenoid valve opens to generate the flow channel A13; S2. As the flow of the medium through the solenoid valve increases, the liquid pressure gradually increases, causing the gap between the valve port 6 and the limit ring 7 to gradually expand, and the damping force provided by the solenoid valve increases relatively slowly; at this time, the left side of the limit ring 7 and the throttle baffle 8 is the P port. When the gap between the valve port 6 and the limit ring 7 increases to the normal through hole area B of the normal through hole S3 of the throttle baffle 8, the minimum throttling area of ​​the solenoid valve is fixed to the normal through hole area B of the normal through hole S3 of the throttle baffle 8. At this time, the flow of the medium through the solenoid valve causes the liquid pressure to rise rapidly, which can provide a larger restoring damping force for the shock absorber.

[0041] When the built-in shock absorber damping control solenoid valve is in a compressed state:

[0042] S1. During the compression stroke, the right side of the limit ring 7 and the throttle baffle 8 is the P port. After the medium passes through the central flow hole S2 and the normal flow hole S3 of the throttle baffle 8, a hydraulic pressure is established to push the valve core 5 open, and the solenoid valve opens to generate a flow channel B13; S2. As the flow rate of the medium through the solenoid valve increases, the opening area between the valve port 6 and the valve core 5 gradually increases, and the damping force provided by the solenoid valve increases relatively slowly; when the opening area between the valve port 6 and the valve core 5 increases to the maximum area formed by the throttle baffle 8 and the one-way valve plate 9, that is, the sum of the central flow hole area A and the normal flow hole area B, the interception area for the medium flow remains unchanged, and the increase in flow causes the hydraulic pressure to rise rapidly, which can provide a greater compression damping force for the shock absorber.

[0043] The key improvements of the present invention are:

[0044] 1. The change in damping force after the valve is opened is controlled by the one-way valve plate 9 and the throttle baffle 8, thereby increasing the control range of the solenoid valve on the damping force of the shock absorber, and at the same time having the ability to independently adjust the damping force of the recovery and compression strokes; it is also possible to use other forms of one-way valve plate structures to achieve independent adjustment of the damping force of the recovery formation and compression strokes. 2. The damping force of the recovery stroke after the solenoid valve is opened is controlled by the flow area of ​​the permanent holes of the throttle baffle. The means of modifying the flow area of ​​the permanent holes include changing the number, size, shape of the permanent holes and the relative position relationship with the one-way valve plate. 3. The minimum flow area of ​​the compression stroke is controlled by the area of ​​the central flow hole of the throttle baffle and the limit height of the limit ring, thereby controlling the damping force of the compression stroke after the solenoid valve is opened. 4. The one-way valve plate has a limiting structure in the deformation direction. Comprehensively improve working performance.

[0045] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A control method for a built-in shock absorber damping control solenoid valve, characterized in that: The limiting ring (7) and the throttle baffle (8) of the built-in shock absorber damping control solenoid valve are pressed into one end port of the valve sleeve sub-assembly (4). The limiting ring (7) and the throttle baffle (8) clamp the outer edge of the one-way valve disc (9) to limit the position. The center of the throttle baffle (8) is provided with a central flow hole (S2). The outer ring of the throttle baffle (8) is provided with a plurality of regular through holes (S3). The valve disc area (S1) of the one-way valve disc (9) is larger than the central flow hole area A of the central flow hole (S2) of the throttle baffle (8). The valve disc area (S1) of the one-way valve disc (9) is set to be able to block the central flow hole (S2) of the throttle baffle (8) and the throttle baffle (8) when not under hydraulic working conditions. The normally open hole (S3) is an unobstructed structure; when the left side of the limiting ring (7) and the throttle baffle (8) is the P port, under the action of the liquid pressure, the central flow hole area A of the central flow hole (S2) of the throttle baffle (8) is blocked by the one-way valve plate (9), and the medium can only flow to the T port located on the other side of the limiting ring (7) through the normal flow hole area B of the normally open hole (S3) of the throttle baffle (8); when the right side of the limiting ring (7) and the throttle baffle (8) is the P port, the liquid pressure pushes the one-way valve plate (9) to deform, the central flow hole (S2) of the throttle baffle (8) opens, and the flow area of ​​the throttle baffle (8) increases, which is the sum of the central flow hole area A and the normally open hole area B; The limiting ring (7) and the throttling baffle (8) are respectively connected to the valve sleeve sub-assembly (4) in an interference fit manner. The inside of the one-way valve disc (9) is configured to deform only toward the position of the limiting ring (7). The maximum deformation position of the one-way valve disc (9) is limited by the limiting ring (7). The valve sleeve sub-assembly (4) is internally mounted with a magnetic core sub-assembly (3), a magnetic core shaft (11), a valve core (5), a valve port (6), a limiting ring (7), a one-way valve plate (9), a throttle baffle (8), and externally mounted with a solenoid sub-assembly (2) and a rear yoke sleeve (1); When the built-in shock absorber damping control solenoid valve is in a compressed state: S1. During the compression stroke, the right side of the limit ring (7) and the throttle baffle (8) is the P port. The medium passes through the central flow hole (S2) and the normal flow hole (S3) of the throttle baffle (8), and the hydraulic pressure is built up to push the valve core (5) open. The solenoid valve opens to generate flow channel B (14). S2. As the flow rate of the medium through the solenoid valve increases, the opening area between the valve port (6) and the valve core (5) gradually increases, and the damping force provided by the solenoid valve increases relatively slowly; when the opening area between the valve port (6) and the valve core (5) increases to the maximum area formed by the throttle baffle (8) and the one-way valve plate (9), that is, the sum of the area A of the central flow hole and the area B of the normal flow hole, the throttling area for the medium flow remains unchanged, and the increase in flow rate causes the hydraulic pressure to rise rapidly, which can provide a greater compression damping force for the shock absorber.

2. The control method of the built-in shock absorber damping control solenoid valve according to claim 1, characterized in that: The solenoid sub-assembly (2) is installed in the valve sleeve sub-assembly (4), the magnetic core sub-assembly (3) is installed in the valve sleeve sub-assembly (4), the magnetic core shaft (11) passes through the magnetic core sub-assembly (3) and the rear yoke sleeve (1); the outer ring of the magnetic core shaft (11) is covered with a spring (12).

3. The control method of the built-in shock absorber damping control solenoid valve according to claim 1 or 2, characterized in that: The valve sleeve sub-assembly (4) is provided with a side hole (10).

4. The control method of the built-in shock absorber damping control solenoid valve according to claim 1 or 2, characterized in that: The built-in shock absorber damping control solenoid valve is configured to be a structure capable of switching between a restoring state and a compression state by providing different pressure controls.

5. The control method of the damping control solenoid valve of the built-in shock absorber according to claim 1 or 2, characterized in that: The damping force of the return stroke of the solenoid valve after opening is controlled by the flow area of ​​the normally open holes of the throttle baffle (8), including changing the number, size, shape and relative position relationship of the normally open holes and the one-way valve plate to control the flow area of ​​the normally open holes of the throttle baffle (8).

6. The control method of the damping control solenoid valve of the built-in shock absorber according to claim 1 or 2, characterized in that: The minimum flow area of ​​the compression stroke is controlled by the flow area of ​​the center hole of the throttling baffle and the limit height of the limit ring, thereby controlling the damping force of the compression stroke after the solenoid valve is opened.

7. The control method of the damping control solenoid valve of the built-in shock absorber according to claim 4, characterized in that: The control steps of the control method of the built-in shock absorber damping control solenoid valve are as follows: When the built-in shock absorber damping control solenoid valve is in the restored state: S1. During the recovery stroke, the hydraulic pressure overcomes the combined force of the spring force and the electromagnetic force, causing the magnetic core shaft (11), the valve port (6) and the valve core (5) to move to the left, and the electromagnetic valve opens to generate flow channel A (13); S2. As the flow rate of the medium through the solenoid valve increases, the hydraulic pressure gradually increases, causing the gap between the valve port (6) and the limit ring (7) to gradually expand, and the damping force provided by the solenoid valve to rise relatively slowly; at this time, the left side of the limit ring (7) and the throttle baffle (8) is the P port. When the gap between the valve port (6) and the limit ring (7) increases to the area B of the normal through hole (S3) of the throttle baffle (8), the minimum throttling area of ​​the solenoid valve is fixed to the area B of the normal through hole (S3) of the throttle baffle (8). At this time, the flow rate of the medium through the solenoid valve causes the hydraulic pressure to rise rapidly, which can provide a greater restoring damping force for the shock absorber.

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