Abstract
This paper studies the energy efficiency of a heavily loaded cylinder drive. Pulse code modulation is used to control all four flow path independently with parallel connected on/off valves. A valve manifold with 4x5 two-way screw-in cartridge valves is used and the dimensions of the test system are such that actuator size, load force, effective inertia and natural frequency are at the same level as in joint actuators of typical medium size mobile machines. A cost function based control solution is used for online minimization of power losses. Power losses are compared with traditional proportional load-sensing system.
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