Smith pre-estimation compensation variable universe fuzzy PID electro-hydraulic suspension position control method

By employing the Smith prediction-compensated variable universe fuzzy PID electro-hydraulic suspension position control method, the problem of insufficient position tracking accuracy of electro-hydraulic servo active suspension under random road surface excitation and external disturbances is solved, achieving high-precision tracking and improved stability, thereby enhancing vehicle safety and comfort.

CN121734010APending Publication Date: 2026-03-27HARBIN UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610138810.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-31
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

Electro-hydraulic servo active suspension is susceptible to the effects of master time delay, system nonlinearity and parameter uncertainty under random road surface excitation and external disturbance conditions, resulting in insufficient position tracking accuracy, reduced closed-loop stability margin and limited vehicle body vibration suppression capability.

Method used

A Smith-predicted compensation variable universe fuzzy PID electro-hydraulic suspension position control method is adopted. By establishing a quarter-vehicle two-degree-of-freedom active suspension dynamic model, an actuator model of servo valve control input and hydraulic cylinder piston displacement is constructed. Combined with the Smith predictive compensation structure, the main time delay is predicted and compensated. The variable universe fuzzy inference is used to realize the online self-tuning of PID parameters, thereby improving the position tracking accuracy and closed-loop stability.

Benefits of technology

Improving position tracking accuracy under random road surface and external disturbance conditions, reducing sprung mass displacement, velocity and acceleration response, and enhancing overall vehicle safety, stability and ride comfort.

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Abstract

The invention discloses a Smith pre-estimation compensation variable universe fuzzy PID electro-hydraulic suspension position control method, and belongs to the field of vehicle active suspension control. Aiming at the problems of position tracking lag and vibration reduction performance degradation caused by main time lag, strong nonlinearity and parameter fluctuation of a valve control cylinder servo system, a coupling dynamic model of a quarter vehicle two-degree-of-freedom suspension and an electro-hydraulic servo actuator is constructed, and an equivalent main time lag parameter is measured through multiple simulation experiments. And a Smith pre-estimation link is adopted to carry out predictive compensation on a time delay channel, meanwhile, a control error and an error change rate are used for driving variable universe fuzzy reasoning to carry out online self-adaptive fine adjustment and correction on PID parameters, and servo valve control voltage is output. Random road surface displacement excitation is further introduced to carry out simulation comparison verification, sprung mass displacement and speed and acceleration response are integrated, tracking precision, disturbance suppression capability and robustness are remarkably improved, and vehicle smoothness and riding comfort are improved.
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