Abstract
A simulation model of a hybrid excavator has been developed for the estimation of the fuel consumption and the optimum design of the hybrid system dynamics in the practical operation of the hybrid excavator. The hybrid excavator consists of a hybrid power train system with power electronics devices such as converter, an actuator system driven by electro-hydraulic system, and linkage system of a front attachment with the boom, the arm, and bucket. The simulation model enables us to analyze these systems totally. In this paper, the power electronics system is modeled to second order differential equations of motion, and the total system equations are established with considering the coupling with the power electronic system, the hydraulic system, and linkage system. The boom system is picked up for the operability design for the residual vibration, and the energy saving effect is estimated for the boom system.
