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access icon openaccess Uniform switched control strategy of valve-controlled asymmetric hydraulic system

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 04/10/2018, Accepted 17/10/2018, Revised 14/10/2018, Published 22/10/2018

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.

Inspec keywords: feedback; control system synthesis; valves; linearisation techniques; PD control; robust control; hydraulic systems

Other keywords: valve-controlled asymmetric hydraulic system; proportional differential control strategy; uniform switched control; USC strategy; switch control gain; PD control; system robustness; uniform feedback linearisation control structure; FLC control; hydraulic system control

Subjects: Fluid mechanics and aerodynamics (mechanical engineering); Control system analysis and synthesis methods; Stability in control theory; Control of hydraulic systems; Control technology and theory (production)

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