Fractional PI λD μ control and optimisation for vehicle active suspension

Long Zhi, Yunqing Zhang, Liping Chen, Jingzhou Yang

Research output: Contribution to journalArticle


This paper presents an active suspension for a quarter-car model with two Degrees Of Freedom (DOF) using a fractional PI λD μ controller. The active control is expressed as the summation of PI λ and PD μ, which use vertical acceleration of the body and suspension deflection, respectively, as input variables. The parameters of the controller are optimised using a Genetic Algorithm (GA). The simulation results indicate that the fractional PI λD μ controller for the suspension system is effective in the vibration isolation of the vehicle body and has better performance than the classical PID controller.

Original languageEnglish
Pages (from-to)276-287
Number of pages12
JournalInternational Journal of Vehicle Autonomous Systems
Issue number3-4
StatePublished - Dec 1 2008



  • Active suspension
  • Fractional PI D
  • GA
  • Genetic algorithm
  • Optimisation

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