Built-in shock absorber damping control electromagnetic valve and control method thereof

Abstract

The invention belongs to the technical field of vehicle shock absorbers, and relates to a built-in shock absorber damping control electromagnetic valve. The invention further relates to a control method of the built-in shock absorber damping control electromagnetic valve. The limiting ring (7) and the throttling baffle (8) are installed at a port of one end of the valve sleeve subassembly (4) in a pressing mode, the limiting ring (7) and the throttling baffle (8) clamp the outer edge of the one-way valve block (9) for limiting, a center circulation hole (S2) is formed in the center of the throttling baffle (8), a plurality of normal through holes (S3) are formed in the outer ring of the throttling baffle (8), and the valve block area (S1) of the one-way valve block (9) is larger than the center circulation hole area A of the center circulation hole (S2) of the throttling baffle (8). According to the built-in shock absorber damping control electromagnetic valve, control over the flow area of the electromagnetic valve is achieved through the throttling baffle and the one-way valve block, the smoothness of a vehicle is difficult to guarantee under the complex and severe road conditions, the vehicle driving experience is improved, and the built-in shock absorber damping control electromagnetic valve can be applied to more types of vehicle types.

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 suppress the impact of shock absorption and adjustment from the road. They are widely used in vehicle vibration reduction, and play a role in attenuating the vibration of the frame and body, improving the smoothness of the car's ride and providing a good driving experience. Although the shock-absorbing spring can filter the vibration of the road during the driving process of the vehicle, the shock-absorbing spring itself will also have reciprocating motion, and the shock absorber is used to suppress the jumping of this shock-absorbing spring. The shock absorber is filled with oil and has two inner and outer chambers. The oil can flow through the pores connecting the two chambers, and a damping solenoid valve is installed at the position to control the flow of the pores to control the damping force of the shock absorber. At present, the built-in shock absorbers on the market control the current to make the solenoid valve provide different damping forces, but the adjustable range of the damping force after the solenoid valve is opened under the same current is low, and it is difficult to ensure the smoothness of the vehicle under more complex and harsh road conditions.

[0003] In the prior art, there is a technology named "steplessly adjustable vehicle suspension shock absorber" and the publication (announcement) number is "CN115059717B", which discloses a steplessly adjustable vehicle suspension shock absorber, including an oil storage cylinder, a working cylinder and a piston rod assembly arranged in the working cylinder; a control valve assembly is arranged between the oil storage cylinder and the working cylinder in the oil storage cylinder, and the control valve assembly includes a mounting sleeve mounted on the working cylinder and at least one group of valve groups arranged on the mounting sleeve, and the mounting sleeve is provided with a control chamber for installing the valve group and a first channel and a second channel connected to the control chamber, one end of the first channel is connected to the oil storage chamber of the oil storage cylinder, and one end of the second channel is connected to the working chamber of the working cylinder, and the valve group is arranged in the control chamber for controlling the opening and closing between the first channel and the second channel. Compared with the existing solenoid valve external / internal shock absorber structure, it solves the problems of occupying a large layout space, requiring an additional intermediate cylinder or increasing the length and failing to meet the needs of short-stroke application scenarios, and the overall structure is simpler and more compact, with better 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, ensure the smoothness of the vehicle under complex and harsh road conditions, improve the vehicle driving experience, and 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 on a port at one end of a valve sleeve subassembly, the limit ring and the throttle baffle clamp the outer edge of a one-way valve plate to limit the position, a central flow hole is arranged at the center of the throttle baffle, a plurality of normally open holes are arranged on the outer ring of the throttle baffle, the valve plate area of ​​the one-way valve plate is larger than the central flow hole area A of the central flow hole of the throttle baffle, and the valve plate area of ​​the one-way valve plate is arranged 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 plate under the action of the 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 ring; when the right side of the limit ring and the throttle baffle is the P port, the hydraulic pressure pushes the one-way valve plate to deform, the central flow hole of the throttle baffle is opened, and the flow area of ​​the throttle baffle is increased, which is the sum of the central flow hole area and the normal through hole area.

[0008] The valve sleeve sub-assembly is internally installed with a magnetic core body sub-assembly, a magnetic core shaft, a valve core, a valve port, a limit ring, a one-way valve plate, and a throttling baffle, and is externally installed with a solenoid sub-assembly 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 throttling baffle are respectively connected with the valve sleeve sub-assembly in interference connection, the inside of the one-way valve plate is arranged to be a structure that can only deform toward the position of the limit ring, and the maximum deformation position of the one-way valve plate is limited by the limit ring.

[0011] The valve sleeve sub-assembly 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 of 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, 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 when it is difficult to ensure vehicle smoothness under complex and harsh road conditions. The control method can be applied to more types 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] S1. In the recovery stroke, the hydraulic pressure overcomes the combined force of the spring force and the electromagnetic force, causing the magnetic core shaft, valve port and valve core to move left, and the solenoid valve opens to generate a flow channel;

[0018] 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 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 throttling 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 normal through hole of the throttling baffle, the minimum throttling area of ​​the solenoid valve is fixed to the normal through hole area of ​​the normal through hole of the throttling baffle. At this time, the flow rate of the medium through the solenoid valve causes the hydraulic pressure to rise rapidly, which can provide a larger 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 the 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 generate 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 throttling 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 the medium flow remains unchanged, and the increase in flow rate causes the liquid 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 built-in shock absorber damping control solenoid valve described in the present invention improves the local structure of the built-in shock absorber damping control solenoid valve. Specifically, based on the improvement of the valve sleeve sub-assembly, a limit ring is pressed on a port at one end of the valve sleeve sub-assembly; then a one-way valve plate is installed on the right side of the limit ring, and a throttle baffle needs to be pressed on a port at one end of the valve sleeve sub-assembly, and the throttle baffle is close to the one-way valve plate; the throttle baffle is provided with a special structure, that is, a central flow hole is provided at the center of the throttle baffle, and a plurality of regular through holes are provided on the outer ring of the throttle baffle, and a special structure is provided for the one-way valve plate, that is, the valve plate area of ​​the one-way valve plate is larger than the central flow hole area A of the central flow hole of the throttle baffle. After the relevant parts are assembled, the valve plate area of ​​the one-way valve plate can block the central flow hole of the throttle baffle plate when it is not subjected to hydraulic working conditions, while the normally open hole of the throttle baffle plate 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 plate is the P port, the central flow hole area A of the central flow hole of the throttle baffle plate is blocked by the one-way valve plate under the action of the hydraulic pressure, 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 ring; when the right side of the limit ring and the throttle baffle plate is the P port, the hydraulic pressure pushes the one-way valve plate to deform, the central flow hole of the throttle baffle plate is opened, and the flow area of ​​the throttle baffle plate is increased, 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 plate is limited by the limit ring. 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 and the throttle baffle, which increases the control range of the solenoid valve on the damping force of the shock absorber, and has 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 normal through hole of the throttle baffle. The means of modifying the flow area of ​​the normal through hole include changing the number, size, shape of the normal 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 It is a structural schematic diagram of the damping control solenoid valve of the built-in shock absorber according to the present invention;

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

[0027] Figure 3It 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 It 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 It 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 It is a structural schematic diagram of the return stroke oil circuit of the built-in shock absorber damping control solenoid valve of the present invention;

[0031] Figure 7 It is a structural schematic 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 attached drawings are: 1, rear yoke sleeve; 2, solenoid sub-assembly; 3, magnetic core body sub-assembly; 4, valve sleeve sub-assembly; 5, valve core; 6, valve port; 7, limit ring; 8, throttling baffle; 9, one-way valve plate; 10, side hole; 11, magnetic core shaft; 12, spring; 13, flow channel A; 14, flow channel B; S1, valve plate area; S2, center flow hole; S3, normal through hole. DETAILED DESCRIPTION

[0033] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0034] As attached Figure 1 -Attached Figure 7As shown, the present invention is a built-in shock absorber damping control solenoid valve, the limit ring 7 and the throttle baffle 8 are pressed on the port at one end of the valve sleeve sub-assembly 4, the limit ring 7 and the throttle baffle 8 clamp the outer edge of the one-way valve plate 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 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, and the valve plate area S1 of the one-way valve plate 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 limit 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 located on the other side of the limit ring 7 through the normal through hole area B of the normally open 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 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 above structure proposes an improved technical solution to address the deficiencies in the prior art. When setting the structure, the local structure of the built-in shock absorber damping control solenoid valve is improved. Specifically, it is improved 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, the throttling baffle 8 needs to be pressed into the port at one end of the valve sleeve sub-assembly 4, and the throttling baffle 8 is close to the one-way valve plate 9; the throttling baffle 8 is provided with a special structure, namely: a central flow hole S2 is provided in the center of the throttling baffle 8, and a plurality of regular through holes S3 are provided in the outer circle of the throttling 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 throttling baffle 8. After the relevant components are assembled, the valve plate area S1 of the one-way valve plate 9 can block the central flow hole S2 of the throttle baffle 8 when it is not subjected to 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, 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 hydraulic pressure, 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 plate 9 to deform, the central flow hole S2 of the throttle baffle 8 is opened, and the flow area of ​​the throttle baffle 8 is increased, which is 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 plate 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, the control range of the solenoid valve on the damping force of the shock absorber is increased, and the damping force of the recovery and compression strokes can be independently adjusted; other forms of one-way valve structures can also be used to achieve independent adjustment of the damping force of the recovery 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 normal through hole of the throttle baffle 8. The means of modifying the flow area of ​​the normal through hole include changing the number, size, shape of the normal 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. The built-in shock absorber damping control solenoid valve described in the present invention has a simple structure and can expand the damping force adjustment range of the solenoid valve after the solenoid valve is opened under the same current. It can ensure the smoothness of the vehicle under complex and harsh road conditions, improve the vehicle driving experience, and can be applied to more types of vehicles.

[0035] The valve sleeve sub-assembly 4 is internally installed with the magnetic core sub-assembly 3, the magnetic core shaft 11, the valve core 5, the valve port 6, the limit ring 7, the one-way valve plate 9, the throttle baffle 8, and the solenoid sub-assembly 2 and the back yoke sleeve 1 are externally installed. 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 back yoke sleeve 1; the spring 12 is sleeved on the outer ring of the magnetic core shaft 11. The above structure defines the structure of the entire built-in shock absorber damping control solenoid valve, and the above components are reliably connected, and the limit ring 7 and the throttle baffle 8 are respectively connected with the valve sleeve sub-assembly 4 by interference, and the connection is reliable, and the one-way valve plate 9 is reliably arranged between the limit ring 7 and the throttle baffle 8. The limit ring 7 and the throttling baffle 8 are respectively connected with the valve sleeve sub-assembly 4 by interference, and the inside of the one-way valve plate 9 is configured to deform only toward the position of the limit ring 7, and 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 built-in shock absorber damping control solenoid valve is configured to be able to switch between the restoring state and the compression state by providing different pressure controls. The damping force of the restoring stroke after the solenoid valve is opened is controlled by the flow area of ​​the normal through hole of the throttle baffle 8, including changing the number, size, shape and relative position relationship of the normal through hole with the one-way valve plate to control the flow area of ​​the normal through hole of the throttle baffle 8. The minimum flow area of ​​the compression stroke is controlled by the flow area of ​​the center 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.

[0038] The present invention also relates to a control method for a built-in shock absorber damping control solenoid valve with simple steps, 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 when it is difficult to ensure vehicle smoothness under complex and harsh road conditions. The control method can be applied to more types 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 recovery 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 rate 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 throttling baffle 8 is the P port, and when the gap between the valve port 6 and the limit ring 7 increases to the normal hole area B of the normal hole S3 of the throttling baffle 8, the minimum throttling area of ​​the solenoid valve is fixed to the normal hole area B of the normal hole S3 of the throttling baffle 8. At this time, the flow rate of the medium through the solenoid valve causes the liquid pressure to rise rapidly, which can provide a larger recovery 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 through hole S3 of the throttle baffle 8, a liquid 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 through hole area B, the interception area for the medium flow remains unchanged, and the increase in flow rate causes the liquid 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 damping force change after the valve is opened is controlled by the one-way valve plate 9 and the throttle baffle 8, and the control range of the solenoid valve on the damping force of the shock absorber is increased. At the same time, it has 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 stroke. 2. The damping force of the recovery stroke after the solenoid valve is opened is controlled by the flow area of ​​the normal through hole of the throttle baffle. The means of modifying the flow area of ​​the normal through hole include changing the number, size, shape of the normal 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.

[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 protection scope of the present invention.

Claims

1. A built-in shock absorber damping control solenoid valve, characterized in that: The limiting ring (7) and the throttle baffle (8) are pressed onto 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 plate (9) to limit the position; a central flow hole (S2) is arranged at the center of the throttle baffle (8); a plurality of regular through holes (S3) are arranged on the outer ring of the throttle baffle (8); a valve plate area (S1) of the one-way valve plate (9) is larger than a central flow hole area A of the central flow hole (S2) of the throttle baffle (8); and the valve plate area (S1) of the one-way valve plate (9) is arranged to be able to block the central flow hole (S2) of the throttle baffle (8) and the regular through hole (S3) of the throttle baffle (8) when not under hydraulic working conditions. The invention is a non-blocking structure; when the left side of the limit 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 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 liquid pressure pushes the one-way valve plate (9) to deform, the central flow hole (S2) of the throttle baffle (8) is opened, and the flow area of ​​the throttle baffle (8) is increased, which is the sum of the central flow hole area A and the normal through hole area B.

2. The built-in shock absorber damping control solenoid valve according to claim 1, characterized in that: The valve sleeve sub-assembly (4) is internally installed with a magnetic core body sub-assembly (3), a magnetic core shaft (11), a valve core (5), a valve port (6), a limit ring (7), a one-way valve plate (9), a throttling baffle (8), and externally installed with a solenoid sub-assembly (2) and a rear yoke sleeve (1).

3. The built-in shock absorber damping control solenoid valve according to claim 1 or 2, 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 sleeved with a spring (12).

4. The built-in shock absorber damping control solenoid valve according to claim 1 or 2, characterized in that: The limit ring (7) and the throttling baffle (8) are respectively interference-connected with the valve sleeve sub-assembly (4); the inside of the one-way valve plate (9) is configured to be deformed only toward the position of the limit ring (7); and the maximum deformation position of the one-way valve plate (9) is limited by the limit ring (7).

5. The internal shock absorber damping control solenoid valve according to claim 4, characterized in that: The valve sleeve sub-assembly (4) is provided with a side hole (10).

6. 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.

7. The built-in shock absorber damping control solenoid valve according to claim 1 or 2, characterized in that: The damping force of the restoring stroke of the electromagnetic valve after opening is controlled by the flow area of ​​the normally open holes of the throttling 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 throttling baffle (8).

8. The built-in shock absorber damping control solenoid valve 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.

9. A control method for a built-in shock absorber damping control solenoid valve, 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, so that the gap between the valve port 6 and the limit ring 7 gradually expands, 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 throttling 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 throttling 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 throttling 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 larger restoring damping force for the shock absorber.

10. The control method of the damping control solenoid valve of the built-in shock absorber according to claim 9, characterized in that: 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. After the medium passes through the central flow hole (S2) and the normal flow hole (S3) of the throttle baffle (8), the hydraulic pressure is established to push the valve core (5) open, and the solenoid valve opens to generate the flow channel B (13); 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 throttling baffle (8) and the one-way valve plate (9), that is, the sum of the center 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 rate causes the liquid pressure to rise rapidly, which can provide a greater compression damping force for the shock absorber.

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