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Abstract

To study the working performance in heavy vehicles using the control air suspension system (CASS), a vehicle’s three-dimensional dynamic model was established and controlled by using the SIMULINK model and fuzzy control built into the software of MATLAB. Two indexes of road friendliness and comfort level were used for evaluating CASS’s stability and efficiency under all heavy vehicle’s different working cases. The study showed that all simulation cases including the moving speeds, load conditions, and road excitations of the heavy vehicle greatly affect road friendliness and comfort level. Especially at conditions of low speed from 7.5 to 12.5 m/s, vehicle’s half load, and random roads of ISO-D and ISO-E. Thus, to improve these two indexes, heavy vehicles should move at high speeds from 20 to 25 m/s and use full load. Besides, with the CASS applied, the working performance of the heavy vehicle was overall superior to the vehicle’s passive air suspensions in improving road friendliness and comfort level. Therefore, the CASS should be applied to heavy vehicles to enhance their working performance.

Keywords

Heavy vehicle mathematical model control air suspensions fuzzy’s optimal control road friendliness comfort level

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Efficiency and stability of heavy vehicle’s control air suspensions on improving road friendliness and comfort level

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