Uniform switched control strategy of valve-controlled asymmetric hydraulic system

• Main Authors: Jun Yang, Zhongxiang Chen, Le Zeng, Shuzhou Huang
• Format: Article
• Language: English
• Published: Wiley 2018-10-01
• Series: The Journal of Engineering
• Subjects: linearisation techniques; feedback; valves; hydraulic systems; control system synthesis; robust control; PD control; valve-controlled asymmetric hydraulic system; uniform feedback linearisation control structure; system robustness; switch control gain; FLC control; proportional differential control strategy; hydraulic system control; USC strategy; uniform switched control
• Online Access: https://digital-library.theiet.org/content/journals/10.1049/joe.2018.9032

Model set of a valve-controlled asymmetric hydraulic system was built, and uniform switched control (USC) strategy was proposed for multi-model set hydraulic system. Aiming at each subsystem model, the uniform feedback linearisation control (FLC) structure was put forward based on the FLC method, and switch control strategy was used by adjusting switch gain between different sub-models. The boundary layer function was designed in order to enhance the system robustness and to reduce oscillation which is caused by discontinuous item. Furthermore, the switch control gain was further revised according to different load condition. At last, the USC, FLC control, and proportional differential (PD) control strategy was carried out by experiment, and the results show that the maximum speed tracking error of PD and FLC control was 1.1 and 1 mm/s, respectively. The USC strategy speed error is <0.25 mm/s. Compared with the PD and the FLC, the USC was found to be more speed accuracy in multiple state hydraulic system control.