Advances in Automobile Engineering
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Energy Saving Potential of the Independent Metering Fluid Power System

Kailei Liu

Electro-hydraulic proportional control valves are widely applied for motion control in the electro-hydraulic fluid power system. Normally, a sliding spool is used in the proportional control valve to control the flow direction and flow rate passing through the valve, as a result, the meterin and meter-out orifices are mechanically connected . The sliding spool makes the system robust and easy to control, but a number of types of losses have been produced with this kind of valve. Therefore, the conventional electro-hydraulic proportional spool valve control system provides precise motion control, but cannot achieve energy saving performance