ABSTRACT:
This paper is a part of study, conducted to improve the control capabilities of a pressure compensated pump, by implementation of an electrohydraulic controller. This part of was dedicated to investigate the static and dynamic behavior of an axial piston pump of swash plate type. The studied pump is of variable displacement type. It is equipped with a hydro mechanical controlled (pressure compensator). This controlled keeps the pump displacement maximum if the pressure is less than certain limiting value. When the pump exit pressure exceeds this limit, the controlled reduces the pump displacement gradually until the real pump flow becomes null. The study starts by deducing detailed mathematical model describing the pump together with its hydro mechanical controller. The deducing mathematical model is used to develop a computer simulation program for the studied system using (SIMULINK). The steady state pump flow characteristics were evaluated experimentally and used to validate the simulation results. The comparison of the theoretical and experimental results of the pump flow characteristic showed good agreement between them. The simulation program was used to investigate the dynamic behavior of the pump equipped with its pressure compensator. This class of pump controlled produces unique control law. Any modification of the control law requires major modification of the controlled design.