Implementation of Proportional-Integral-Plus Controller in Vehicle Active Suspension System
Proportional-integral-plus (PIP) controllers are simple, effective in dealing with nonlinearities and offering a rational extension of traditional proportional-integral/proportional-integral-derivative (PI/PID) techniques, with extra dynamic feedback and input compensators introduced automatically specially when the system is complicated or has considerable time delays. This paper investigates the implementation of a PIP controller based on a non-minimal state space (NMSS) form in a vehicle active suspension system, for the first time, to enhance ride comfort and vehicle stability. The active vehicle suspension system is modeled as a two degrees–of–freedom mechanical system and simulated using Matlab/Simulink software. The performance of the proposed vehicle active suspension system controlled using the PIP is compared to active suspension controlled using proportional-integral-derivative (PID) controller and passive suspension systems. Systems performance criteria are evaluated in time and frequency domains to assess the efficiency of the proposed PIP controller. Theoretical results confirm that the proposed PIP controller of vehicle active suspension system grants a significant enhancement of ride comfort and vehicle stability.
Active Vehicle Suspension System, Quarter Car Model, Proportional-Integral-Plus (PIP) Controller, PID
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