Model Research and its Parameter Evaluation for Electrical-hydraulic Controlling System of Excavator

Hydraulic excavator is a typical and complicated construction machine.With the development of society,the automation of construction machine must be a necessary trend.But the hydraulic controlling system is of great nonlinear and is hard to control accurately.So it is of great importance to research the mechanical and electrical driving system,especially the unsymmetrical actuators.The hydraulic driving system of excavators was researched and its controlling model based on the state equations was presented,which makes a foundation for its controlling principle and designing of the controller.