Operating Principles and Simulation of a Novel Meter Out Control System for Mobile Machines

The paper introduces a new architectural solution named Metering Out Sensing System, in the field of Mobile Proportional Valves for Multiple Actuators Systems. The purpose of the hydraulic system is to control the flow directed to actuators according to the proportional control of the metering out element only, with an automatic system to adjust the displacement of the pump, to compensate the load difference between actuators, to control both resisting and overrunning loads and finally to activate the regeneration function. The Meter Out Sensing System in its most basic embodiment doesn't require sensors nor electronic controls to perform a flow control proportional to the metering out area control, in both positive or negative load control mode. The regeneration feature, moreover, enables energy savings reducing the flow supply from the pump. The paper will present the architecture and operating principles, providing as well the results of a Lumped Parameter Model Simulation.