Properties and Applications of the Electrohydraulic Servosystem of the Hydraulic Excavator

Abstract

The safety and stability of the control system are influenced by external factors. The object of the study is the electrohydraulic servosystem of the hydraulic excavator. The mathematical and simulation models using AMESIM for the servosystem are constructed. Then the pressure and flow characteristics are analyzed. The design and optimization of the electrohydraulic servosystem and its application in excavator engineering are described. The operation process is graphically presented by a curve, which steeply slopes up (rising period) and then flattens out (stabilization period), those periods are shortened by 38.0 and 40.5%, respectively, the delay tracking period decreased by 52.6%, and anti-interference is reliable.

Nonlinear adaptive position control of hydraulic servo system based on sliding mode back-stepping design method

“…Electro-hydraulic servo system is widely used in many mobile and industrial applications due to their high power-to-weight ratio. For example, they have been used in hydraulic excavators, 1,2 load simulators 3–5 and robot manipulators. 6 However, there are strong nonlinearities and uncertainties in electro-hydraulic servo systems, such as friction model nonlinearity, strong nonlinearity of servo valve flow, model uncertainty or system parameter uncertainty and unknown external disturbances.…”