Search

CN-122008986-A - Structure cooperative control seat suspension system, control method thereof and vehicle

CN122008986ACN 122008986 ACN122008986 ACN 122008986ACN-122008986-A

Abstract

The invention discloses a seat suspension system with cooperative control structure, a control method thereof and a vehicle, and belongs to the field of vehicle vibration control. The system comprises a suspension type main unit and a shear type auxiliary unit which are coupled through a mechanical connection structure, wherein cylinder bodies of the main shock absorber and the auxiliary shock absorber are directly and fixedly connected with a piston rod to form mechanical coupling, an information sensing unit collects state signals, a central cooperative controller analyzes signal frequency band energy distribution based on a modal energy method to identify working conditions, a fuzzy PID and a zenith control algorithm are executed in parallel, and the two algorithms are fused dynamically according to the energy distribution to output to generate a coordination control instruction, and a damping execution unit responds to the instruction to output acting force. According to the invention, through the unique mechanical coupling design and the depth cooperation of the self-adaptive control mode based on energy distribution, the unification of low-frequency large-impact inhibition and high-frequency small-amplitude vibration filtration is realized, and the riding comfort and the seat posture stability in the whole frequency domain are obviously improved.

Inventors

  • ZHENG MINYI
  • XUE ZHIJIANG
  • LIU MINGXING
  • ZHONG WEIMIN

Assignees

  • 合肥工业大学

Dates

Publication Date
20260512
Application Date
20260303

Claims (10)

  1. 1. A structurally cooperatively controlled seat suspension system comprising: The compound mechanical unit is formed by coupling a suspension type main unit (1) and a shear type auxiliary unit (2) through a mechanical connection structure (3), wherein the suspension type main unit (1) is provided with a main shock absorber, and the shear type auxiliary unit (2) is provided with an auxiliary shock absorber; The information sensing unit (4) is used for collecting seat motion state signals; The central cooperative controller (5) is connected with the information sensing unit (4) and is configured to identify the current vibration working condition based on the seat motion state signal, execute a fuzzy PID control algorithm and a canopy control algorithm in parallel to generate a first target acting force and a second target acting force respectively, and fuse the first target acting force and the second target acting force through a dynamic weight distributor (5-3) to output a cooperative control instruction; And the damping execution unit (6) comprises a first actuator arranged on the suspension type main unit (1) and a second actuator arranged on the scissor type auxiliary unit (2) and is used for responding to the coordination control instruction and outputting corresponding acting force.
  2. 2. The structurally coordinated seat suspension system according to claim 1 wherein: The suspension type main unit (1) is arranged at the rear part of the seat and comprises a swing arm type guide mechanism and a main shock absorber; the scissor-type auxiliary unit (2) is integrated in the middle of the seat base and comprises a pair of crossed connecting rods, an elastic element and an auxiliary shock absorber; The elastic element is an air spring, and is used as a common elastic element of the two units after the suspension type main unit (1) and the scissor type auxiliary unit (2) are coupled through the mechanical connection structure (3).
  3. 3. The structurally cooperatively controlled seat suspension system according to claim 1 wherein said mechanical connecting structure (3) comprises a rigid connection, a web or an integrated structure and the cylinder of said primary shock absorber is connected to the piston rod end of said secondary shock absorber by said mechanical connecting structure (3).
  4. 4. The structurally cooperatively controlled seat suspension system according to claim 1, characterized in that said information sensing unit (4) comprises: A first displacement sensor (4-1) provided to the suspension type main unit (1); a second displacement sensor (4-2) provided to the scissor sub unit (2); A seat acceleration sensor (4-3) for measuring a seat platform acceleration; Wherein the central cooperative controller (5) is respectively connected with the first displacement sensor (4-1), the second displacement sensor (4-2) and the seat acceleration sensor (4-3).
  5. 5. The structurally cooperatively controlled seat suspension system according to claim 1 wherein said central cooperative controller (5) comprises a signal conditioning and fusion module (5-1), a condition identifier (5-2), a dynamic weight distributor (5-3) and an instruction synthesis and output module (5-4), wherein said dynamic weight distributor (5-3) is configured to: Respectively carrying out energy estimation on the seat motion state signal in a preset low frequency band and a preset high frequency band to obtain a low frequency band energy duty ratio and a high frequency band energy duty ratio, and determining a main weight and an auxiliary weight by combining a comparison result of the seat acceleration amplitude and a preset threshold value; and fusing the first target acting force and the second target acting force based on the main weight and the auxiliary weight to obtain the instruction quantity corresponding to the coordination control instruction.
  6. 6. The structurally coordinated seat suspension system according to claim 1 wherein the first actuator and the second actuator are one or a combination of the following: ① A continuously adjustable damping valve group (6-1 a,6-2 a) which is of a proportional electromagnetic valve structure and can receive pulse width modulation signals to realize damping adjustment; ② A switching solenoid valve group (6-1 b,6-2 b) capable of receiving a switching signal and switching between at least two preset discrete damping gears; ③ And the active actuators (6-1 c,6-2 c) are linear actuators driven by motors and can output pushing force or pulling force according to control instructions.
  7. 7. The structurally coordinated seat suspension system according to claim 6 wherein: When the first actuator and the second actuator are the switch electromagnetic valve groups (6-1 b,6-2 b), the coordination control instruction output by the central coordination controller (5) is a discrete gear selection signal; when the first actuator and the second actuator are the active actuators (6-1 c,6-2 c), the coordination control instruction is an analog quantity or digital quantity signal containing the information of the magnitude and the direction of the acting force.
  8. 8. The structurally coordinated seat suspension system according to claim 1 wherein the central coordinated controller (5) is further configured to perform a self-learning update by recording different vibration condition recognition results, control instructions and evaluation data or feedback data related to the control process and updating the weight map of the dynamic weight distributor (5-3) based on the recorded data.
  9. 9. A control method for a seat suspension system for cooperative control of a structure according to any one of claims 1 to 8, characterized by comprising the steps of: S1, synchronously acquiring multi-source sensing signals through the information sensing unit (4); S2, a central cooperative controller (5) performs signal fusion and feature extraction on the multi-source sensing signals, and identifies the current vibration working condition based on an energy estimation result; s3, based on sensing data at the same moment, a fuzzy PID control algorithm and a canopy control algorithm are operated in parallel to generate a first target acting force and a second target acting force; S4, determining a main weight and an auxiliary weight through a dynamic weight distributor (5-3) according to the working condition identified in the step S2, and synthesizing a first target acting force and a second target acting force into a final control instruction based on the main weight and the auxiliary weight; S5, the damping execution unit (6) responds to the final control instruction, drives the first actuator and the second actuator to output corresponding acting force, and returns to the step S1 to be circularly executed.
  10. 10. A vehicle equipped with a structurally cooperatively controlled seat suspension system according to any one of claims 1 to 8.

Description

Structure cooperative control seat suspension system, control method thereof and vehicle Technical Field The invention relates to the technical field of vehicle vibration control, in particular to a seat suspension system and a control method thereof, and especially relates to an active/semi-active seat suspension system which is used for realizing efficient suppression of wide-frequency-domain vibration by cooperation of a specific mechanical coupling structure and an intelligent control strategy based on energy distribution identification, and a vehicle with the system. Background The seat suspension system is used as a key component for improving the riding comfort of the vehicle, and the performance optimization always faces a core contradiction on how to effectively cope with low-frequency large-displacement impact and high-frequency small-amplitude vibration in running. From the mechanical structure level, the prior art mainly relies on two typical arrangements of suspension type and scissors type, but both have limitations. The suspension type structure is good at digesting low-frequency large impact from a road surface by virtue of large stroke and strong bearing capacity, however, the filtering effect of the suspension type structure on high-frequency fine crushing vibration is often unsatisfactory, whereas the shear type structure has the advantages of compact structure and sensitive response to high-frequency vibration, but has weaker large impact resistance and is easy to interfere under complex movement. In some current solutions, although two structures are attempted to be spatially combined and arranged, the two structures are stopped in a simple physical juxtaposition, and the deep coupling and interaction of the two structures in a mechanical layer cannot be realized, so that the respective performance advantages of the two structures cannot be cooperatively exerted, and the overall efficiency is limited. In terms of control strategies, the mainstream algorithm also has a similar field. The ceiling control strategy can effectively attenuate medium-high frequency vibration near the resonance frequency of the car body, remarkably improves the comfort of normal running, and has insufficient inhibition effect when facing impact with large amplitude and low frequency. While algorithms based on state feedback, such as fuzzy PID control, show good robustness and stability in dealing with non-linearities, large disturbances, their accuracy may be limited when fine suppression of high frequency vibrations is performed. More common problems are that the existing control scheme adopts a single algorithm or fixed combination, the strategy switching is usually dependent on simpler frequency or amplitude threshold judgment, and the frequency domain energy distribution information contained in the vibration signal cannot be fully mined and utilized, so that the control decision is rough, and the self-adaption and intelligent level of the system is required to be improved. In addition, the coupling mode between the form of the actuator and the mechanical structure and the control algorithm in the prior art is usually fixed, and a set of cooperative control system which can flexibly configure the type of the actuator according to different performance indexes, cost constraint and packaging requirements and can be closely matched with an innovative mechanical coupling structure is lacked. Therefore, there is a need in the industry for a comprehensive solution that can implement deep coupling of structures at a mechanical level, make intelligent decisions based on vibration energy at a control level, and support flexible configuration of software and hardware at a system level, so as to break through performance bottlenecks encountered in multi-band vibration suppression of current seat suspensions. Disclosure of Invention Aiming at the problems that in the prior art, the seat suspension cannot be subjected to self-adaptive decision according to the vibration energy essence due to single mechanical structure or simple combination, and the low-frequency impact resistance and the high-frequency vibration filtering comfort cannot be optimized at the same time, the invention provides the following technical scheme: In a first aspect, the present invention provides a structurally cooperatively controlled seat suspension system comprising: The combined mechanical unit is formed by coupling a suspension type main unit and a scissor type auxiliary unit through a mechanical connection structure, wherein the suspension type main unit is provided with a main shock absorber, and the scissor type auxiliary unit is provided with an auxiliary shock absorber; the information sensing unit is used for collecting a seat motion state signal; The central cooperative controller is connected with the information sensing unit and is configured to identify the current vibration working condition based on the seat motion state signal,