Robust control of the pressure in a control-cylinder with direct drive valve for the variable displacement axial piston pump

被引:27
|
作者
Park, S-H [1 ]
Lee, J-M [1 ]
Kim, J-S [1 ]
机构
[1] Pusan Natl Univ, Sch Mech Engn, Pusan 609735, South Korea
关键词
variable displacement axial piston pump with the electric value; control cylinder; robust pressure control; direct drive valve; sliding mode control;
D O I
10.1243/09596518JSCE677
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
To achieve energy-efficient hydraulic systems, an accurate flowrate and pressure required by a load should be supplied to the systems. The discharge flow from the variable displacement swash-plate type axial piston pump is mainly determined by the angle of the swash-plate and it is adjusted by controlling the pressure in the control cylinder, which is a mechanical regulator for the swash-plate. In this paper, a robust pressure control system of the control cylinder using a direct drive valve is proposed to control the discharge flow from the variable displacement swash-plate type axial piston pump precisely. In order to design a robust pressure control system, a mathematical model of a pressure control system is derived and system parameters are identified by using the signal-compression method. Also, the sliding mode controller is designed based on the identified mathematical model to guarantee the control performance of the pressure control system. Experiments verified the satisfactory performance of the proposed pressure control system that uses a direct drive even with non-linearity and uncertainties such as flow characteristics, unknown discharge coefficient of the valve orifice, variation of the bulk-modulus, leakage, and disturbance induced by the pressure fluctuation in the pressure control system.
引用
收藏
页码:455 / 465
页数:11
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