|DATTILO STEFANO||Cycle: XXXIII |
Section: Systems and Control
Tutor: FAGIANO LORENZO MARIO
Advisor: SAVARESI SERGIO MATTEO Major Research topic
:Analysis and control design of advanced suspension systemsAbstract:
This PhD thesis deals with the technological analysis, modelling, and control design of advanced suspension system for automotive applications.
The suspension is fundamental for the well-being of vehicle passengers: it must ensure an adequate level road disturbance filtering, and it must preserve the tire-road contact. For these reasons electronically controllable suspensions are subject of intensive research in both academy and industry.
The main objective of this thesis consists in the analysis of the most promising state-of-the-art suspension technologies already available on the market, and in the design of control algorithm targeted to comfort, sport-performance, and safety improvement. The cutting-edge suspension technology is currently represented by:
Multichamber suspension: It is a semi-active suspension able to modulate both damping and stiffness coefficients at high frequency. After developing a mathematical model, experimentally validated with a prototype, I proposed control algorithms able to improve comfort and handling of a passenger vehicle.
Hydro-pneumatic suspension: this type of architecture allows to change the system equilibrium position by injecting fluid in the suspension. I designed a load-levelling control algorithm, and I experimentally validated in two different scenarios: a front-axle-suspension for small size agricultural tractor, and a fully suspended tractor cabin.
Proactive suspension: it is a technology that can produce active force and it is able to recover energy. Firstly, a mathematical model of the system is proposed, then a comfort-oriented, and a sport-performance-oriented algorithm are designed, and eventually they are validated in an advanced vehicle dynamic simulator.