Active Suspension Control Of Ground Vehicle Heave And Pitch Motion

Asok Max , Subramaniam (2013) Active Suspension Control Of Ground Vehicle Heave And Pitch Motion. Project Report. UTeM, Melaka. (Submitted)

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Abstract

Vehicle in motion experience unwanted motion such as heave and pitch motion due to driver input and road irregularities. Heave motion refers to the vehicles vertical displacement and the pitch motion refers the angular moment in the longitudinal direction of the vehicle. Active suspension system uses a feedback control system which reduces the effects of pitch and heave motion of the vehicle by using counterforces of the actuators onto the suspension system. PID controller have been used in previous active suspension system control strategy, and to improve the efficiency and the effectiveness of the control strategy, a new controller is introduced, namely the fuzzy logic controller. The mathematical model for the half car suspension model is developed and modeled in the MATLAB Simulink software. Using the vehicle model, a control strategy is constructed using PID controller and the fuzzy logic controller. The feedback control system includes the decoupling transformation, in which splits the needed forces to the front and rear actuators of the active suspension. To prove the effectiveness of the fuzzy logic controller on the vehicle suspension model, a performance evaluation is performed by comparing the results of the fuzzy logic controller with the result obtained through simulation of the feedback control system using the PID controller. Based from the comparison of the controllers, the fuzzy logic controller is decided as better performing in terms of reducing the vehicle vibrations.

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