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The position tracking control problem of electrical cylinder in the presence of nonlinear friction load, inertia load and nonlinear disturbance due to its transmission process is addressed in this paper. To compensate all of these disturbances in the case of servo motion, active disturbance rejection control is used to make a continuous and precise transition. Tracking differentiator is used for arranging...
This paper presents an observer-based robust controller equipped with a fast friction estimator for a 6-DOF parallel electrical manipulator (PEM) in the joint-task space. First, the joint-task space framework for a 6-DOF PEM is constructed, which not only avoids time-consuming forward kinematics, but also contains the dynamic model. Second, a nonlinear disturbance observer is designed to estimate...
Hydro-viscous speed clutch (HVC) is a central control element of the driver system. Because of nonlinearities and hysteresis of the clutch, the setting of control parameters has a significant impact on the performance of the speed control system. This paper studies the HVC of a vehicle temperature control system, and analyzes the parameters tuning method of a PID controller for the closed-loop control...
This paper addresses the energy saving problem in single-rod electro-hydraulic servo system (EHSS) driven by servo motor. Firstly, the performance of key components in EHSS is analyzed and tested locally and globally to pursue better control effect. Then, an energy saving controller containing three control variables is proposed. The servo valve controller is designed based on ARC to guarantee a prescribed...
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