Modeling and analysis of an electronic load sensing pump

Abstract

This paper describes the modeling and analysis of the dynamics of an electronic load sensing hydraulic system consisting of a load sensing pump, a flow control valve, a hydraulic cylinder and an effective mass representing the linkage inertia. Load sensing hydraulic circuits are prone to instabilities and frequently require hydraulic filters in the form of orifices and control volumes to remove unwanted oscillations. Closed loop controllers for such systems are difficult to design due to the nonlinearities and high order transfer functions. In this paper a linear model is derived from equations of motion, and validated against a nonlinear simulation model based on MATLAB. Then, a third order model is derived that can be used for controller design.