tailieunhanh - PID Control Implementation and Tuning Part 4

Tham khảo tài liệu 'pid control implementation and tuning part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | ride comfort with only few papers Williams and Haddad 1995 Ayat et al. 2002a Wang et al. 2005 Ayat et al. 2002b studying how an active suspension system can improve vehicle handling. It is well-known that a vehicle tends to roll on its longitudinal axis if the vehicle is subjected to steering wheel input due to the weight transfer from the inside to the outside wheels. Some control strategies for ARC systems have been proposed to cancel out lateral weight transfer using active force control strategy Hudha et al. 2003 hybrid fuzzy-PID Xinpeng and Duan 2007 speed dependent gain scheduling control Darling and Ross-Martin 1997 roll angle and roll moment control Miege and Cebon 2002 state feedback controller optimized with genetic algorithm Du and Dong 2007 and the combination of yaw rate and side slip angle feedback control Sorniotti and D Alfio 2007 . In this study ARC system is developed using four units of pneumatic system installed between lower arms and vehicle body. The proposed control strategy for the ARC system is the combination of PID based feedback control and roll moment rejection based feed forward control. Feedback control is used to minimize unwanted body heave and body roll motions while the feed forward control is intended to reduce the unwanted weight transfer during steering input maneuvers. The forces produced by the proposed control structure are used as the target forces by the four unit of pneumatic system. The use of pneumatic actuator for an active roll control suspension system is a relatively new concept and has not been thoroughly explored. The use of pneumatic system is rare in active suspension application although they have several advantages compared with other actuation systems such as hydraulic system. The main advantage of pneumatic system is their power-to-weight ratio which is better than hydraulic system. They are also clean simple system and comparatively low cost Smaoui et al. 2006 . The disadvantage of pneumatic system is the .

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