Study on Energy Regeneration Mechanism for Hydraulic PWM Control System

(Influence of Valve Characteristics)

Abstract

The energy efficiency of the conventional flow control of hydraulic systems using the pressure loss of throttle valves, which are widely used in construction machinery, is very low. If the hydraulic PWM control system is used, a significant improvement in energy regeneration efficiency can be expected. However, the non-linear damping and delay in response of switching valves affect the decrease of the energy regeneration efficiency of the hydraulic PWM control system, unlike the transistor in the boost chopper of the electrical system. Therefore, in this study, we grasp the effects of parameters by numerical simulation for a model that simulates a typical hydraulic system used in construction machinery, and try to understand how the characteristics of the switching valves affect the energy regeneration efficiency of hydraulic PWM control system.