Characteristics of Displacement Control Mechanisms in Axial Piston Pumps

Nonlinear pressure control of self-supplied variable displacement axial piston pumps

The present paper deals with the pressure control of self-supplied variable displacement axial piston pumps subject to fast changing, unknown loads. First, the setup of the system and the mathematical model are described. As the pump is self-supplied, the mathematical model exhibits a switching right-hand side which makes the control design a challenging task. A nonlinear two degrees-of-freedom...

An improvement on a method for nonlinear pressure control of self-supplied variable displacement axial piston pumps

A method for pressure control of self-supplied variable displacement axial piston pumps is considered. By analyzing the mathematical model, a crucial part of the nonlinear system is found to be a piecewise linear function. A control strategy composed of an overall feedforward control and a feedback control is given using the smooth hinge function. Compared with current switching feedforward con...

Experimental Investigation in Axial Piston Pumps Barrel Dynamics

It is known that an axial piston pump barrel experiences small oscillations due to forces acting over it. Cavitation als o occurs in many cases, damaging the plate and barrel sliding surfaces and therefore reducing the volumetric and overall efficiency of the pump. More importantly, the resulting failure of the pump is often a critical issue in modern industrial applications. The complex fluctu...

Adaptive Control of Variable Displacement Pumps

Modeling of hydraulic axial piston pumps including specific signs of wear and tear

Reliability of machines and facilities has played an important role since many years. Nowadays, attention is also paid to maintenance times. Maintenance standstills are to be reduced as far as possible. On the other hand, technical systems are subject to signs of wear and tear which are in general growing slowly and imperceptibly. The gradual abrasion of applied tools may lead to poor productio...