IJBTT

Vehicle Active Suspension System performance using Different Control Strategies

	International Journal of Engineering Trends and Technology (IJETT)
	© 2015 by IJETT Journal
	Volume-30 Number-2
	Year of Publication : 2015
	Authors : Atef, Mahmoud M, Soliman, M-Emad S., Sharkawy, A.B.
	DOI :  10.14445/22315381/IJETT-V30P220

Citation 

Atef, Mahmoud M, Soliman, M-Emad S., Sharkawy, A.B."Vehicle Active Suspension System performance using Different Control Strategies", International Journal of Engineering Trends and Technology (IJETT), V30(2),106-114 December 2015. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract
The objective of the present work is to investigate the performance of an active suspension system of a typical passenger car through the application of three different control strategies under three different road irregularities. Tested control strategies are PID, LQR and FLC. Road irregularities considered are: a single rectangular pothole, a single cosine bump, and an ISO class-A random road disturbance. A 2-DOF quarter-vehicle model is used to simulate, evaluate and compare performance of these controllers against each other and against the original passive suspension system. Both tire gripping force and actuator force were normalized with respect to vehicle weight to recognize tire separation and enhance readability and interpretation of results. Simulation results showed that, active suspension systems are advantageous compared to passive ones. Active suspension implementing FLC control surpassed both PID and LQR controllers. Improvement of ride comfort was recognized by a reduction of sprung mass displacement and acceleration up to 23.8% and 52% respectively compared to the passive case. Improvement of load capacity is clear with a suspension travel reduction up to 61%. Moreover, vehicle stability was enhanced by increasing the tire separation margin up to 28 % of vehicle weight. An actuator force up to 39.5% of vehicle weight is required. All achieved by active suspension implementing FLC control.

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Keywords
Vehicle active suspension system, FLC, PID, LQR.