A STUDY ON AN ENERGY SAVING METHOD OF BOOM CYLINDER IN ELECTRO-HYDRAULIC EXCAVATOR

Abstract

Nowadays, the demand for energy saving and green emission of construction machinery, especially electro-hydraulic excavators, has been highly increased. As a result, hybrid system, which are promoted and successfully applied to automobile industry, is recently introduced to hydraulic excavators. This paper presents a new energy saving electro-hydraulic circuit design for the energy regeneration. In this system, a power storage component and an electrical battery is combined with an electro-hydraulic actuator using a hydraulic motor and an electric generator as energy convention component. The saving energy ability of boom cylinder in this circuit is already simulated by AMESim software. Besides that, energy can only be saved in Power Retraction Mode (PR). The natural frequency of the proposed energy recovery system is calculated based on the mathematical models. The effectiveness of the energy saving of boom cylinder in electro-hydraulic excavator is clearly proven by a series of simulation results in AMESim software.