Optimal Metering Mode for Improving Transform Efficiency of Independent Metering System

This paper reports a study of the Independent Metering System of a four-valve configuration controlling an asymmetric hydraulic cylinder. The four-valve consists of four proportional cartridge valves connected with exchangeable control software that the meter-in orifice and meter-out orifice can be separately controlled. The potential energy saving of this system is analyzed via the mathematical analysis of the correlation of the transform efficiency ratio and systematic parameters. There are many metering modes which are the increasing ways of the meter-in and meter-out opening ratios. The 7 typical increasing ways of the meter-in and meter-out opening ratios is analyzed by the mathematical analysis of the transform efficiency and output velocity. Aiming at obtaining a high transform efficiency ratio to realize the energy saving efficiency of the Independent Metering System, the optimal metering mode has been obtained, which is the meter-in orifice is opening proportionally and the meter-out orifice is opening fully.