Method for calibrating time delay feasible region of parameters of active front wheel steering time delay feedback controller

By calibrating the parameters of the active front wheel steering time-delay feedback controller, defining time-delay-independent and correlated stable regions, the impact of time delay on system stability was resolved, the optimal selection of controller parameters was achieved, the system stability and performance were improved, and the test cost was reduced.

CN116819967BActive Publication Date: 2026-06-26HEFEI UNIV OF TECH
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Patent Information

Application Number
CN202310783074.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-29
Publication Date
2026-06-26
Estimated Expiration
2043-06-29

AI Technical Summary

Technical Problem

Existing technologies do not fully consider the stability and performance impact of time delay in active front wheel steering systems, leading to improper selection of controller parameters, which may cause system instability and increase testing costs.

Method used

By defining the time-delay-independent and time-delay-dependent stability regions of the controller parameters, and using the Lyapunov-Krasovskii functional and Laplace transform, the characteristic equation of the time-delay feedback controller is constructed, the stability criterion of the control system is determined, the parameter combination of the AFS time-delay controller is calibrated, and the negative impact of time delay on the system is reduced.

Benefits of technology

It effectively suppresses the negative impact of time delay on the AFS control system, improves the performance and stability of the controller, reduces testing costs, and ensures the handling and safety of the vehicle.

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Abstract

The application discloses a kind of active front wheel steering time delay feedback controller parameter time delay feasible region's calibration method, and include steps: 1) the vehicle system model of active front wheel steering feedback controller including time delay is established;2) by constructing Lyapunov-Krasovskii functional, time delay independent stability parameter region is solved;3) by Laplace transform solving system characteristic equation, obtain stability discriminant polynomial;4) it is solved to the minimum critical time delay that can be tolerated under time delay independent stability region and time delay related stability zone under different control parameter combinations of system.This application can provide reference for controller stability design, compared with traditional active front wheel steering controller without considering time delay, can more effectively judge whether system meets stability requirement, and reduce control parameter adjustment range, so as to reduce test cost in actual engineering, guarantee the stability of vehicle control system.
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