A STUDY ON ENERGY SAVING POTENTIAL OF HYDRAULIC CONTROL SYSTEM USING SWITCHING TYPE CLOSED LOOP CONSTANT PRESSURE SYSTEM

Abstract

Up to now, several types of hybrid systems have been developed to deduce energy consumption. Switching type closed loop constant pressure system (SCL-CPS) was proposed as one of feasible hybrid systems. SCL-CPS also uses flywheel, hydraulic accumulator and hydraulic power transmission as a traditional CPS but it has two alternatively high pressure lines. At a same time, one is used as the high pressure line and the other is the low one. Switching between them to overcome large hydraulic shock and noise considered as serious problems in traditional CPS. In this paper, energy saving potential of system is evaluated by considering effect of component efficiencies in system. Recovery efficiency during deceleration the wheel is estimated by simulation. The results indicate that proper determination of recovery time and operating pressure improves significantly energy recovery potential of the system.