Simulation method of damping force value of CDC shock absorber

Abstract

The invention is applicable to the field of shock absorber adjustment and design, and provides a CDC shock absorber damping force value simulation method. The method comprises simulating the restoration damping force value of the CDC shock absorber and simulating the compression damping force value of the CDC shock absorber, and specifically comprises: distributing the total flow Q flowing out from the restoration chamber at a certain time starting from t1 during the restoration process of the CDC shock absorber, and obtaining the piston flow and the solenoid valve flow respectively after each distribution; calculating the restoration chamber pressure generated by the piston flow obtained after the distribution and the restoration valve system; calculating the restoration chamber pressure generated by the solenoid valve flow obtained after the distribution and the solenoid valve; the invention can simulate the damping force value of the CDC shock absorber on the basis of known relevant parameters, has high simulation accuracy, can quickly and accurately lock the corresponding parameters of the valve system and the solenoid valve model, so that the damping force value reaches the target; thereby significantly improving the efficiency of the adjustment work of the CDC shock absorber.

Description

Technical Field

[0001] The invention belongs to the field of shock absorber adjustment and design, and in particular relates to a method for simulating the damping force value of a CDC shock absorber. Background Art

[0002] The damping force value is the most important functional indicator of the shock absorber, which directly affects the comfort and handling of the vehicle. In order to obtain the desired optimal damping force value, the valve system inside the shock absorber needs to be adjusted. In order to ensure sufficient adjustability, the internal valve system of the shock absorber is designed to be composed of a variety of parts with different functions and specifications. There can be many combinations of various parts. Accurately and quickly locking the optimal combination is the difficulty and pain point of the adjustment work. At the same time, with the increasing application of CDC shock absorbers, the additional "variable" of the solenoid valve is added to the adjustment process; similar to the shock absorber valve system, in order to ensure sufficient adjustability, the CDC solenoid valve is also designed into a variety of specifications, and some suppliers' solenoid valve products can even reach hundreds of models; and the solenoid valve and the shock absorber valve system are mutually influential, which makes the adjustment of the CDC shock absorber more complicated and arduous.

[0003] At present, the tuning work in the shock absorber industry is mainly based on the experience of the tuning engineers. After determining the damping force value target, the ideas and directions of the valve system and CDC solenoid valve tuning are first predicted through experience, and the size range of the valve system parts and the model range of the CDC solenoid valve are preliminarily determined through simple estimation / calculation. Then, these parts are used to assemble the shock absorber and test the damping force; according to the changing trend of the damping force value and the difference from the target damping force value, another size of valve system parts and another model of CDC solenoid valve are tried to be replaced, assembled into a shock absorber and the damping force value is tested; through this continuous attempt, the damping force target value is constantly approached; this work is highly dependent on experience, and usually at least 3-5 "attempts" are required before the damping force value can "reach the standard"; as the driving evaluation work progresses and deepens, in order to obtain the best effect, the target value of the damping force value will be continuously adjusted. Therefore, a lot of resources are required in the entire tuning process, and further improvements are necessary. Summary of the invention

[0004] The object of the present invention is to provide a method for simulating the damping force value of a CDC shock absorber to solve at least one of the defects mentioned in the background art.

[0005] The present invention is implemented as follows: a CDC shock absorber damping force value simulation method is used for adjusting the CDC shock absorber; the CDC shock absorber damping force value simulation method comprises:

[0006] Simulate the CDC shock absorber to restore the damping force value, including:

[0007] Step S101: Set the flow distribution times, and set the CDC shock absorber to recover from t 1 Starting from the time, the total flow Q flowing out of the recovery chamber at a certain time is distributed, and each time the distribution is completed, the piston flow and the solenoid valve flow are obtained respectively;

[0008] Step S103: Calculate the piston flow obtained after distribution, and the pressure of the restoration chamber generated after passing through the restoration valve system, which is recorded as the first restoration chamber pressure;

[0009] Step S105: Calculate the solenoid valve flow obtained after distribution, and the pressure of the recovery chamber generated after passing through the solenoid valve, which is recorded as the second recovery chamber pressure;

[0010] Step S107: Compare the first recovery chamber pressure and the second recovery chamber pressure to obtain a first difference; if the absolute value of the first difference is less than or equal to a set first threshold (such as 0.2 bar), it is considered that the second recovery chamber pressure calculated at this time is the CDC shock absorber at time t 1 The recovery chamber pressure at this time t 1 The restoring chamber pressure and the compression chamber pressure at time t are used to calculate and obtain the CDC shock absorber 1 The corresponding restoring damping force at the restoring velocity point;

[0011] Step S109: If the absolute value of the first difference is greater than the set first threshold, it is considered that the flow distribution at this time does not match the actual situation, and the flow distribution and pressure calculation are continued until step S107 is met, or the flow distribution times are used up;

[0012] Simulate the compression damping force value of the CDC shock absorber, including:

[0013] Step S102: Set the flow distribution times to adjust the CDC shock absorber during compression from t 1’ Starting from the time, the total flow Q' flowing out of the compression chamber at a certain time is distributed, and each time the distribution is completed, the bottom valve flow and the solenoid valve flow are obtained respectively;

[0014] Step S104: Calculate the bottom valve flow obtained after distribution, and the recovery chamber pressure generated after passing through the compression valve system, which is recorded as the third recovery chamber pressure;

[0015] Step S106: Calculate the solenoid valve flow obtained after distribution, and the pressure of the restoration chamber generated after passing through the solenoid valve, which is recorded as the fourth restoration chamber pressure;

[0016] Step S108: Compare the third recovery chamber pressure and the fourth recovery chamber pressure to obtain a second difference; if the absolute value of the second difference is less than or equal to a set second threshold (such as 0.2 bar), it is considered that the fourth recovery chamber pressure calculated at this time is the CDC shock absorber at time t 1’ The recovery chamber pressure at this time t 1’ The restoring chamber pressure and the compression chamber pressure at time t are used to calculate and obtain the CDC shock absorber 1’ The compression damping force at the corresponding compression speed point;

[0017] Step S110: If the absolute value of the second difference is greater than the set second threshold, it is considered that the flow distribution at this time does not match the actual situation, and the flow distribution and pressure calculation are continued until step S108 is met, or the flow distribution times are used up.

[0018] The present invention provides a CDC shock absorber damping force value simulation method, which can simulate the damping force value of the CDC shock absorber (single valve and double valve) on the basis of known shock absorber valve system parameters and CDC solenoid valve parameters, has high simulation accuracy, can quickly and accurately lock the corresponding valve system parameters and solenoid valve model, so that the damping force value reaches the target; thereby significantly improving the efficiency of the adjustment work and saving a lot of resources; at the same time, the method can not only simulate the system damping force value more accurately, but also simulate the flow / pressure difference changes of the core components inside the CDC shock absorber during the entire shock absorber movement process, thereby providing effective guidance for the adjustment engineer in the selection of parts; it can also be used to quantitatively analyze the influence of the shock absorber valve system parameters on the damping force value, the influence of the CDC solenoid valve parameters on the damping force value, and the relationship between the CDC solenoid valve and the shock absorber valve system; thereby providing a design and optimization basis for the design of the core components of the CDC shock absorber, such as the valve system, the CDC solenoid valve, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic flow chart of a method for simulating the restoring damping force of a passive vibration absorber in the present invention;

[0020] Figure 2 It is a schematic flow chart of a method for simulating compression damping force of a passive shock absorber in the present invention;

[0021] Figure 3 It is a structural schematic diagram of a passive vibration absorber in the present invention;

[0022] Figure 4 is a cross-sectional view of the recovery valve system of the present invention;

[0023] Figure 5 is a cross-sectional view of the compression valve system of the present invention;

[0024] Figure 6 A schematic diagram of the structure of a CDC single-valve shock absorber provided by the present invention;

[0025] Figure 7 A schematic diagram of the structure of a CDC double-valve shock absorber provided by the present invention;

[0026] Figure 8 This is an example of the oil flow during the recovery and compression of the passive shock absorber in the present invention;

[0027] Fig. 9 This is an example of the oil flow during the recovery and compression of the CDC shock absorber in the present invention;

[0028] Fig.10 It is a two-dimensional table of PQ (pressure difference-flow) of the CDC solenoid valve in the present invention;

[0029] Fig.11 The process diagram of the CDC shock absorber restoring damping force simulation method in the present invention is shown in FIG. Figure 1 ;

[0030] FIG. 12 (A) and FIG. 12 (B) are combined to show the process flow of the CDC shock absorber restoring damping force simulation method of the present invention. Figure 2 ;

[0031] Fig.13 The schematic diagram of the CDC shock absorber compression damping force simulation method in the present invention is as follows: Figure 1 ;

[0032] FIG. 14 (A) and FIG. 14 (B) are combined to show the flow of the CDC shock absorber compression damping force simulation method of the present invention. Figure 2 ;

[0033] Fig.15 A diagram showing a change in the damping force value of a small current of a simulation result of the damping force value of a CDC shock absorber in the present invention;

[0034] Fig.16 A large current damping force value variation diagram of the CDC shock absorber damping force value simulation result in the present invention;

[0035] Fig.17 It is a flow change diagram of the flow simulation result of the CDC shock absorber in the present invention when the small current is restored;

[0036] Fig.18 It is a flow change diagram of the flow simulation result of the CDC shock absorber in the present invention during low current compression;

[0037] Fig.19 It is a flow change diagram of the flow simulation result of the CDC shock absorber in the present invention during large current recovery;

[0038] Fig. 20It is a flow change diagram of the flow simulation result of the CDC shock absorber during high current compression in the present invention;

[0039] Figure 21 to Figure 24 It is the pressure / pressure difference simulation result of the CDC shock absorber in the present invention.

[0040] In the figure: 1-connecting rod; 2-steel cylinder; 3-storage cylinder; 4-restoration valve system; 41-piston throttle hole; 42-restoration valve system stacking valve plate; 43-restoration valve system throttle valve plate; 5-piston; 6-piston compensation valve; 7-bottom valve compensation valve; 8-bottom valve; 9-compression valve system; 91-bottom valve throttle hole; 92-compression valve system stacking valve plate; 93-compression valve system throttle valve plate; 10-compression chamber; 11-oil; 12-liquid storage chamber; 13-gas; 14-restoration chamber; 15-intermediate cylinder; 16-connecting sleeve; 17-solenoid valve; 18-restoration solenoid valve connecting sleeve; 19-restoration solenoid valve; 20-compression solenoid valve; 21-compression solenoid valve connecting sleeve;

[0041] Preb-restoring chamber pressure; △Pt-pressure difference at both ends of the connecting sleeve; Pcom-compression chamber pressure; Ps-pressure difference between the inlet and outlet of the solenoid valve; Prebo-piston chamber pressure; Q-flow rate; Pgas-inflation pressure; Pcomo-compression chamber pressure; △()-pressure difference generated by the oil flowing through two places; △Pm-pressure difference generated by the oil flowing through the middle cylinder. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] It can be understood that the terms "first", "second", etc. used in the present invention can be used in this article to describe various elements, but unless otherwise specified, these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0044] In practice, the simulation of damping force value in the existing CDC shock absorber adjustment process has the following defects: it is mainly based on experience, with large errors, generally 20%-30%; it is not systematic, and the key parameters of the internal parts of the shock absorber, such as flow and pressure, cannot be clearly defined, and the level and changes during the movement of the shock absorber may lead to incorrect parts selection; it cannot accurately and quantitatively analyze the mutual influence relationship between the CDC solenoid valve and the shock absorber valve system; it is necessary to repeatedly disassemble and assemble the shock absorber, adjust the valve system parts and the solenoid valve, and test the damping force value in order to make the damping force value "reach the standard", which consumes a lot of resources. Based on this, the present invention designs a CDC shock absorber damping force value simulation method.

[0045] In this embodiment, the CDC shock absorber is based on the passive shock absorber, and one or two external solenoid valves are added to form a single-valve CDC shock absorber or a double-valve CDC shock absorber; the solenoid valve is connected in parallel with the passive valve system of the shock absorber. When the shock absorber moves, the oil flows through the passive valve system, and pressure is generated inside the shock absorber. When the pressure reaches the opening point of the solenoid valve, the oil overflows through the solenoid valve, thereby realizing the solenoid valve's control of the internal pressure of the shock absorber, thereby obtaining the desired damping force value.

[0046] In one embodiment, Figure 3 As shown, the structure of the passive shock absorber includes: a steel cylinder 2, a piston 5 arranged in the steel cylinder 2, a bottom valve 8, and a storage cylinder 3 arranged outside the steel cylinder 2. The piston 5 is connected to a connecting rod 1 extending outside the steel cylinder 2, a restoring chamber 14 is formed between the connecting rod 1 and the steel cylinder 2, and a compression chamber 10 is formed between the piston 5 and the bottom valve 8; the storage cylinder 3 has a liquid storage chamber 12, which contains oil 11 and gas 13; the piston 5 is provided with a restoring valve system 4 and a piston compensation valve 6, and the bottom valve 8 is provided with a compression valve system 9 and a bottom valve compensation valve 7.

[0047] In an example of this embodiment, Figure 3-Figure 5 As shown, the restoring valve system 4 includes a piston throttling hole 41, a restoring valve system stacked valve plate 42, and a restoring valve system throttle valve plate 43; the compression valve system 9 includes a bottom valve throttling hole 91, a compression valve system stacked valve plate 92, and a compression valve system throttle valve plate 93.

[0048] In an example of this embodiment, Figure 6 , Figure 7 As shown, the CDC shock absorber includes a single-valve CDC shock absorber and a double-valve CDC shock absorber.

[0049] The single-valve CDC shock absorber adds a solenoid valve to the structure of the passive shock absorber; the configuration is as follows: an intermediate cylinder 15 is arranged between the steel cylinder 2 and the storage cylinder 3, the intermediate cylinder 15 is connected to a connecting sleeve 16, and the connecting sleeve 16 is connected to the solenoid valve 17;

[0050] The double-valve CDC shock absorber adds two solenoid valves to the structure of the passive shock absorber; it is configured as follows: an intermediate cylinder 15 is set between the steel cylinder 2 and the storage cylinder 3, and two connecting sleeves 16 are connected at different heights on both sides of the intermediate cylinder 15, which are a restoration solenoid valve connecting sleeve 18 and a compression solenoid valve connecting sleeve 21, respectively. The restoration solenoid valve connecting sleeve 18 is connected to the restoration solenoid valve 19; the compression solenoid valve connecting sleeve 21 is connected to the compression solenoid valve 20.

[0051] Therefore, the simulation of the damping force value of the CDC shock absorber needs to be based on the passive shock absorber;

[0052] In one embodiment, Figure 1 , Figure 2As shown, a passive shock absorber damping force simulation method is provided, which is based on the mechanism of "forming" the damping force value, that is, the flow produces a pressure difference. Specifically, the mechanism satisfies:

[0053] During recovery, the piston 5 moves upward. Since the oil 11 is incompressible, the oil 11 in the recovery chamber 14 will be "squeezed" into the compression chamber 10. During this process, the oil 11 will sequentially pass through the piston throttle hole 41 and the recovery valve system throttle valve plate 43. When the flow rate of the oil 11 is greater than the valve opening flow rate of the recovery valve system stacked valve plate 42, the recovery valve system 4 opens, and the oil 11 will pass through the "opening" formed by the recovery valve system stacked valve plate 42 and the piston 5, and finally flow into the compression chamber 10. At the same time, the oil 11 in the storage cylinder 3 will flow into the compression chamber 10 through the bottom valve compensation valve 7 of the compression valve system 9, replenishing the compression chamber 10 with oil, and forming a recovery oil circuit.

[0054] In this example, the oil flow when the passive shock absorber is restored is shown in Figure 8 ; In the whole process, according to the above-mentioned recovery oil circuit, equations can be listed for the flow rate and pressure difference at each location, and then multiple equations can be jointly solved for the unknown quantity, so that the relevant parameters (flow rate / pressure / pressure difference) at any location in the oil circuit during the movement of the shock absorber can be obtained; the pressure of the recovery chamber 14 and the pressure of the compression chamber 10 obtained, combined with the basic parameters (or specification parameters) of the shock absorber, such as the connecting rod / cylinder / barrel size / inflation pressure, can be used to obtain the recovery damping force;

[0055] Compression is similar to recovery. The oil 11 in the compression chamber 10 is "squeezed" into the liquid storage chamber 12. At the same time, part of the oil 11 flows into the recovery chamber 14 through the piston compensation valve 6 of the recovery valve system 4. The corresponding equation is listed according to the oil circuit. Combined with the specification parameters of the shock absorber, the compression damping force can be obtained. In this example, the oil flow when the passive shock absorber is compressed can be referred to Figure 8 The oil flow during the recovery and compression of the CDC shock absorber can be found in Fig. 9 .

[0056] In this example, the simulation steps for restoring the damping force value of the passive shock absorber are shown in Figure 1 , which is the prior art and will not be described in detail here. The simulation steps of the compression damping force value of the passive shock absorber are shown in Figure 2 , which is the prior art and will not be described in detail here.

[0057] In one embodiment, Figure 11-Figure 1 4, a CDC shock absorber damping force value simulation method is used for adjusting the CDC shock absorber, and the CDC shock absorber damping force value simulation method includes: simulating the CDC shock absorber restoring damping force value and simulating the CDC shock absorber compression damping force value.

[0058] In an example of this embodiment, simulating the CDC shock absorber restoring damping force value specifically includes:

[0059] Step S101: Set the flow distribution times, and set the CDC shock absorber to recover from t 1 Starting from the time, the total flow Q flowing out of the recovery chamber at a certain time is distributed, and each time the distribution is completed, the piston flow and the solenoid valve flow are obtained respectively;

[0060] In step S101, the flow Q is distributed to satisfy:

[0061] t 1 ,t 2 , ... to t m , with an average interval of 1.01 ms; m is a natural number and can be set according to actual needs. This example does not make any specific limitations.

[0062] t 1-0 to 1-100 , t 2-0 to 2-100 , ....t m-0 to m-100 It is divided into 101 equal time intervals, each of which is 0.01ms; among them, t 1-0 to 1-100 It is t 1 The average of t 2-0 to 2-100 It is t 2 's equal share;

[0063] Specifically, during the restoration process of the CDC shock absorber, 1 Starting from the time, the total flow Q flowing out of the recovery chamber at a certain time is divided into two parts according to the steps and proportions in Table 1. After each distribution, the flow of the piston and the flow of the solenoid valve are obtained respectively;

[0064] Table 1 is the flow distribution table of the piston and solenoid valve during the recovery process

[0065]

[0066] Step S103: Calculate the piston flow obtained after distribution, and the pressure of the restoration chamber generated after passing through the restoration valve system, which is recorded as the first restoration chamber pressure;

[0067] Step S105: Calculate the solenoid valve flow obtained after distribution, and the pressure of the recovery chamber generated after passing through the solenoid valve, which is recorded as the second recovery chamber pressure;

[0068] The calculations in step S103 and step S105 are performed every 0.01 ms.

[0069] Step S107: Compare the first recovery chamber pressure and the second recovery chamber pressure to obtain a first difference; if the absolute value of the first difference is less than or equal to the set first threshold, it is considered that the second recovery chamber pressure calculated at this time is the CDC shock absorber at time t 1 The recovery chamber pressure at this time t 1 The restoring chamber pressure and the compression chamber pressure at time t are used to calculate and obtain the CDC shock absorber 1 The corresponding restoring damping force at the restoring velocity point;

[0070] Step S109: If the absolute value of the first difference is greater than the set first threshold, it is considered that the flow distribution at this time does not match the actual situation, and the flow distribution and pressure calculation are continued until step S107 is met, or the flow distribution times are used up;

[0071] It is understandable that the number of traffic distribution times is limited and can be set to a constant as needed, such as 1000 times, 5000 times, etc., and this step is not limited to this.

[0072] In step S109, the flow distribution times are used up: if the absolute value of the first difference is still greater than the set first threshold, the second recovery chamber pressure calculated during the first flow distribution is used as the CDC shock absorber pressure at time t 1 The recovery chamber pressure at this time t 1 The restoring chamber pressure and the compression chamber pressure at time t are used to calculate and obtain the CDC shock absorber 1 The corresponding restoring damping force at the restoring velocity point;

[0073] In this step, the first threshold is 0.2 bar, and may also be other values, such as 0.1 bar, 0.3 bar, 0.5 bar, etc.

[0074] In an example of this embodiment, simulating the compression damping force value of the CDC shock absorber specifically includes:

[0075] Step S102: Set the flow distribution times to adjust the CDC shock absorber during compression from t 1’ Starting from the time, the total flow Q' flowing out of the compression chamber at a certain time is distributed, and each time the distribution is completed, the bottom valve flow and the solenoid valve flow are obtained respectively;

[0076] In step S102, the flow Q' is distributed to satisfy:

[0077] t 1’ ,t 2’ , ... to t n’ , with an average interval of 1.01ms; n is a constant and can be set as needed.

[0078] t 1’-0 to 1’-100 , t 2’-0 to 2’-100 , ....t n’-0 to n’-100 It is divided into 101 equal time intervals, each of which is 0.01ms; among them, t 1’-0 to 1’-100 It is t 1’ The average of t 2’-0 to 2’-100 It is t 2’ The average share of .

[0079] Specifically, during the compression process of the CDC shock absorber, from t 1’ Starting from the time, the flow Q' squeezed out from the compression chamber at a certain time is divided into two parts according to the steps and proportions in Table 2. After each distribution, the flow of the bottom valve and the flow of the solenoid valve are obtained respectively;

[0080] Table 2 is the flow distribution table of the bottom valve and solenoid valve during compression

[0081]

[0082] Step S104: Calculate the bottom valve flow obtained after distribution, and the recovery chamber pressure generated after passing through the compression valve system, which is recorded as the third recovery chamber pressure;

[0083] Step S106: Calculate the solenoid valve flow obtained after distribution, and the pressure of the restoration chamber generated after passing through the solenoid valve, which is recorded as the fourth restoration chamber pressure;

[0084] Step S108: Compare the third and fourth restoring chamber pressures to obtain a second difference; if the absolute value of the second difference is less than or equal to the set second threshold, it is considered that the fourth restoring chamber pressure calculated at this time is the CDC shock absorber at time t 1’ The recovery chamber pressure at this time t 1’ The restoring chamber pressure and the compression chamber pressure at time t are used to calculate and obtain the CDC shock absorber 1’ The compression damping force at the corresponding compression speed point;

[0085] Step S110: If the absolute value of the second difference is greater than the set second threshold, it is considered that the flow distribution at this time does not match the actual situation, and the flow distribution and pressure calculation are continued until step S108 is met, or the flow distribution times are used up;

[0086] In step 110, the flow distribution times are used up: if the absolute value of the second difference is still greater than the set second threshold, the fourth restoration chamber pressure calculated during the first flow distribution is used as the pressure of the CDC shock absorber at time t 1’ The recovery chamber pressure at this time t 1’ The restoring chamber pressure and the compression chamber pressure at time t are used to calculate and obtain the CDC shock absorber 1’ The compression damping force at the corresponding compression speed point.

[0087] In an example of this embodiment, a single-valve CDC shock absorber is used as an example. The CDC shock absorber reconditioning oil flow is shown in FIG. Fig. 9 , CDC shock absorber compression oil flow see Fig. 9 ; Since the CDC shock absorber is obtained on the basis of the passive shock absorber, the mechanism of "forming" the damping force value of the passive shock absorber can be directly applied to the mechanism of "forming" the damping force value of the CDC shock absorber.

[0088] In an example of this embodiment, step S103 specifically includes:

[0089] Based on the passive shock absorber, the relevant parameters of the piston throttle hole, the throttle valve plate of the restoring valve system, and the stacked valve plate of the restoring valve system during restoration are determined to solve the restoration chamber pressure and the compression chamber pressure;

[0090] The basic parameters of the passive shock absorber are determined, and the restoring damping force is obtained by combining the restoring chamber pressure and the compression chamber pressure.

[0091] Furthermore, during restoration, the piston 5 moves upward, and because the oil 11 is incompressible, the oil 11 in the restoration chamber 14 will be squeezed into the compression chamber 10. In this process, the oil 11 will pass through the piston throttle hole 41 and the restoration valve system throttle valve plate 43 in sequence. When the flow rate of the oil 11 is greater than the valve opening flow rate of the restoration valve system stacked valve plate 42, the restoration valve system 4 opens, and the oil 11 will pass through the "opening" formed by the valve plate and the piston, and finally flow into the compression chamber 10; at the same time, the oil 11 in the storage cylinder 3 will flow into the compression chamber 10 through the bottom valve compensation valve 7 of the compression valve system 9, and the compression chamber 10 will be replenished with oil.

[0092] In the whole process, equations can be listed for the flow rate and pressure difference at each point according to the above oil circuit, and then multiple equations can be jointly solved for unknown quantities, so that the parameters (flow rate / pressure / pressure difference) at any point in the oil circuit during the movement of the shock absorber can be obtained; the pressure of the restoring chamber 14 and the pressure of the compression chamber 10 obtained, combined with the connecting rod / cylinder / barrel size / inflation pressure of the shock absorber, can be used to obtain the restoring damping force;

[0093] Compression is similar to recovery. The oil 11 in the compression chamber 10 is squeezed into the liquid storage chamber 12. At the same time, a part of the oil 11 flows into the recovery chamber 14 through the piston compensation valve 6 of the recovery valve system 4. The compression damping force can be obtained by listing the corresponding equations according to the oil circuit and combining the specification parameters of the shock absorber.

[0094] In one example of this embodiment, in step S105, the pressure difference generated by the required oil passing through the solenoid valve can be calculated by a table lookup method, specifically, by querying the solenoid valve PQ two-dimensional table (i.e., the solenoid valve pressure difference-flow two-dimensional table), that is, querying the CDC solenoid valve PQ two-dimensional table, such as Fig.10 shown.

[0095] In an example of this embodiment, the use of a table lookup method can avoid the large errors caused by building a solenoid valve model to the system and ensure the simulation accuracy of the damping force value; at the same time, it is also necessary to consider the pressure difference caused by the oil flowing through the intermediate cylinder and the connecting sleeve; see Figures 12 and 14 for details.

[0096] In an example of this embodiment, the first threshold and the second threshold have the same value, which may be 0.2 bar; in other examples, the first threshold and the second threshold may also be set to be different values.

[0097] In one example of this embodiment, in step S106, the pressure difference generated by the oil passing through the solenoid valve can be calculated by a table lookup method, which can be obtained by querying the solenoid valve PQ (pressure difference-flow) two-dimensional table, that is, querying the CDC solenoid valve PQ two-dimensional table, such as Fig.10 shown.

[0098] In an example of this embodiment, using this method can effectively avoid the large errors caused by building the solenoid valve model to the system and ensure the simulation accuracy of the damping force value; at the same time, it is also necessary to consider the pressure difference caused by the flow through the intermediate cylinder and the connecting sleeve; see Figures 12 and 14 for details.

[0099] In an example of this embodiment, when the CDC shock absorber damping force value simulation method is applicable to a single-valve CDC shock absorber, the same CDC solenoid valve PQ characteristic table can be used in the compression and recovery damping simulation processes;

[0100] In an example of the present embodiment, when the above CDC shock absorber damping force value simulation method is applicable to a dual-valve CDC shock absorber, two CDC solenoid valve PQ characteristic tables are used during the compression and recovery damping simulation processes; during compression, the PQ characteristic table corresponding to the compression solenoid valve is used; during recovery, the PQ characteristic table corresponding to the recovery solenoid valve is used.

[0101] In one example of this embodiment, the simulation result of the CDC shock absorber damping force value is shown in Fig.15 , Fig.16 CDC shock absorber flow simulation results are shown in Figure 17-Figure 20 CDC shock absorber pressure / pressure difference simulation results are shown in Figure 21-24 ;

[0102] Fig.21 This is the pressure change diagram of the recovery chamber and compression chamber during high current recovery of the CDC shock absorber pressure / pressure difference simulation result. Fig. 22 This is the pressure change diagram of the recovery chamber and compression chamber during high current compression of the CDC shock absorber pressure / pressure difference simulation result. Fig.23 This is the pressure change diagram of the recovery chamber and compression chamber during the small current recovery of the CDC shock absorber pressure / pressure difference simulation result. Fig.24 This is a diagram of the pressure change in the recovery chamber and compression chamber during low current compression, showing the pressure / pressure difference simulation results of the CDC shock absorber.

[0103] The above simulation results show that: the CDC shock absorber damping force value simulation method of the present embodiment can simulate the damping force value of the CDC shock absorber (single valve and double valve) on the basis of the known shock absorber valve system parameters and CDC solenoid valve parameters, has high simulation accuracy, can quickly and accurately lock the valve system corresponding parameters and solenoid valve model, so that the damping force value reaches the target; thereby significantly improving the efficiency of the adjustment work and saving a lot of resources; at the same time, the present method can not only simulate the system damping force value more accurately, but also simulate the flow / pressure difference changes of the core components inside the CDC shock absorber during the entire shock absorber movement process, thereby providing effective guidance for the adjustment engineer in the selection of parts; it can also be used to quantitatively analyze the influence of the shock absorber valve system parameters on the damping force value, the influence of the CDC solenoid valve parameters on the damping force value, and the relationship between the CDC solenoid valve and the shock absorber valve system; thereby providing a design and optimization basis for the design of the core components of the CDC shock absorber, such as the valve system, the CDC solenoid valve, etc.

[0104] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A CDC shock absorber damping force value simulation method is used for adjusting the CDC shock absorber; it is characterized by: The CDC shock absorber damping force value simulation method includes: Simulate the CDC shock absorber to restore the damping force value, including: Step S101: setting the number of flow distribution times, distributing the total flow Q flowing out of the recovery chamber at a certain time starting from time t1 during the recovery process of the CDC shock absorber, and obtaining the piston flow and the solenoid valve flow after each distribution; Step S103: Calculate the piston flow obtained after distribution, and the pressure of the restoration chamber generated after passing through the restoration valve system, which is recorded as the first restoration chamber pressure; Step S105: Calculate the solenoid valve flow obtained after distribution, and the pressure of the recovery chamber generated after passing through the solenoid valve, which is recorded as the second recovery chamber pressure; Step S107: Compare the restoring chamber pressure values ​​of the first restoring chamber pressure and the second restoring chamber pressure to obtain a first difference; if the absolute value of the first difference is less than or equal to the set first threshold, it is considered that the second restoring chamber pressure calculated at this time is the restoring chamber pressure of the CDC shock absorber at time t1, and the restoring chamber pressure at time t1 will be used together with the compression chamber pressure to calculate and obtain the restoring damping force of the CDC shock absorber at the restoring speed point corresponding to time t1; Step S109: If the absolute value of the first difference is greater than the set first threshold, it is considered that the flow distribution at this time does not match the actual situation, and the flow distribution and pressure calculation are continued until step S107 is met, or the flow distribution times are used up; Simulate the compression damping force value of the CDC shock absorber, including: Step S102: Set the flow distribution times to adjust the CDC shock absorber during compression from t 1’ Starting from the time, the total flow Q' flowing out of the compression chamber at a certain time is distributed, and each time the distribution is completed, the bottom valve flow and the solenoid valve flow are obtained respectively; Step S104: Calculate the bottom valve flow obtained after distribution, and the recovery chamber pressure generated after passing through the compression valve system, which is recorded as the third recovery chamber pressure; Step S106: Calculate the solenoid valve flow obtained after distribution, and the pressure of the restoration chamber generated after passing through the solenoid valve, which is recorded as the fourth restoration chamber pressure; Step S108: Compare the third and fourth restoring chamber pressures to obtain a second difference; if the absolute value of the second difference is less than or equal to the set second threshold, it is considered that the fourth restoring chamber pressure calculated at this time is the CDC shock absorber at time t 1’ The recovery chamber pressure at this time t 1’ The restoring chamber pressure and the compression chamber pressure at time t are used to calculate and obtain the CDC shock absorber 1’ The compression damping force at the corresponding compression speed point; Step S110: If the absolute value of the second difference is greater than the set second threshold, it is considered that the flow distribution at this time does not match the actual situation, and the flow distribution and pressure calculation are continued until step S108 is met, or the flow distribution times are used up.

2. The CDC shock absorber damping force value simulation method according to claim 1, characterized in that: In step S101, the total flow Q is distributed to meet the following conditions: t1, t2, ... to t m , the average interval is 1.01ms; t 1-0 to 1-100 , t 2-0 to 2-100 , ....t m-0 to m-100 It is divided into 101 equal time intervals, each of which is 0.01ms; among them, t 1-0 to 1-100 is the average division of t1, t 2-0 to 2-100 is the average of t2.

3. The CDC shock absorber damping force value simulation method according to claim 1, characterized in that: The step S103 specifically includes: Based on the passive shock absorber, the relevant parameters of the piston throttle hole, the throttle valve plate of the restoring valve system, and the stacked valve plate of the restoring valve system during restoration are determined to solve the restoration chamber pressure and the compression chamber pressure; The basic parameters of the passive shock absorber are determined, and the restoring damping force is obtained by combining the restoring chamber pressure and the compression chamber pressure.

4. The CDC shock absorber damping force value simulation method according to claim 1, characterized in that: In step S105, The pressure difference generated by the oil passing through the solenoid valve can be calculated by checking the solenoid valve pressure difference-flow two-dimensional table.

5. The CDC shock absorber damping force value simulation method according to claim 1, characterized in that: In the step S109, the number of flow distribution times is used up: if the absolute value of the first difference is still greater than the set first threshold value, the second restoring chamber pressure calculated during the first flow distribution is used as the restoring chamber pressure of the CDC shock absorber at time t1. The restoring chamber pressure at time t1 will be used together with the compression chamber pressure to calculate and obtain the restoring damping force of the CDC shock absorber at the restoration speed point corresponding to time t1.

6. The CDC shock absorber damping force value simulation method according to claim 1, characterized in that: In step S102, the flow Q' is distributed to satisfy: t 1’ ,t 2’ , ... to t n’ , the average interval is 1.01ms; t 1’-0 to 1’-100 , t 2’-0 to 2’-100 , ....t n’-0 to n’-100 It is divided into 101 equal time intervals, each of which is 0.01ms; among them, t 1’-0 to 1’-100 It is t 1’ The average of t 2’-0 to 2’-100 It is t 2’ The average share of .

7. The CDC shock absorber damping force value simulation method according to claim 1, characterized in that: The first threshold value and the second threshold value have the same value.

8. The CDC shock absorber damping force value simulation method according to claim 1, characterized in that: In the step S106, the pressure difference generated by the oil passing through the solenoid valve is calculated, which can be obtained by looking up a two-dimensional table of pressure difference-flow of the solenoid valve.

9. The CDC shock absorber damping force value simulation method according to claim 1, characterized in that: In the step S110, the flow distribution times are used up: if the absolute value of the second difference is still greater than the set second threshold, the fourth restoration chamber pressure calculated during the first flow distribution is used as the pressure of the CDC shock absorber at time t 1’ The recovery chamber pressure at this time t 1’ The restoring chamber pressure and the compression chamber pressure at time t are used to calculate and obtain the CDC shock absorber 1’ The compression damping force at the corresponding compression speed point.

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