| Citation: | LIU Hua, WANG Chengwen, GUO Xinping, et al. Active disturbance rejection control method for position servo system based on electro-hydraulic load sensing[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(11): 2131-2139. doi: 10.13700/j.bh.1001-5965.2019.0569(in Chinese)
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To deal with the strong interaction between position loop and pressure loop in the electro-hydraulic load sensing control system, we propose a decoupling strategy based on Active Disturbance Rejection Control (ADRC) in this paper. First, according to the equation expressions built by theoretical analysis, the stale space mode model of the load sensing control system was established. Then, position ADRC controller and pressure ADRC controller are designed to control piston position and pump pressure independently. The dynamic interaction between the position loop and pressure loop, external disturbances and uncertainties are treated as total disturbances, which were compensated by ADRC controller. Finally, co-simulation experiment was conducted by using MATLAB and AMESim. The simulation results show that the proposed control strategy can eliminate the strong interaction between the position loop and pressure loop, and improve the control accuracy and robustness of the system. In addition, the dynamic performance and energy-saving efficiency are compared with those of valve-controlled and pump-controlled systems. The simulation results show that the dynamic performance of the load sensing system based on ADRC is better than that of the pump-controlled system, and the energy efficiency is also greatly improved compared with the valve-controlled system.
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