Research On Energy Saving Control Of Synthetic Positive Flow Of Hydraulic Excavator

This article is based on excavator energy saving development present situation both at home and abroad,and introduces excavator hydraulic system flow control way. it analyses the principle of excavator positive flow control system,and mainly researches the energy saving problem of positive flow control system.Traditional positive flow control system uses shuttle valves to compare the highest press among each pilot press to control variable pump displacement, it isn’t based on each actuator needful flow to control variable pump displacement, it causes that variable pump displacement is always larger than actuator needful flow,and leads to larger system energy loss, lower power efficiency, and a series of shuttle valves make system complicated.It proposes a new kind of synthetic type positive flow control system for improving energy efficiency of positive flow control system. It uses join forces of each pilot press to control variable pump displacement to achieve the goal that variable pump displacement and actuator needful flow is equal. Based on the principle analysis of traditional positive flow control system and synthsis type positive flow control system, it establishes these two systems’math models, and uses Simulink to analyse their step response. It establishes these two systems’operating mechanism models in AMESim, and compares export flow and power of variable pumps when their working mechinasm composite action.The simulation results show that synthetic type positive flow control system’s step response speed is better than traditional positive flow control system. In the process of multi-actuator compound movement simulation, the variable pump export flow of synthsis type positive flow control system is 78.13% of traditional positive flow control system, the variable pump export power of synthetic type positive flow control system is 70.28% of traditional positive flow control system. Compared with the traditional positive flow control system, the simulation results prove that the energy loss of synthetic type positive flow control system is small and its power efficiency is high and more energy-saving.