Abstract
This paper presents a study on the transient characteristics of a variable-displacement, swash-plate type axial piston pump incorporating a pressure compensator. The effects of design and operating parameters on the surge pressure generated in the outlet line at the time of an instantaneous circuit cutoff, and the settling times of pump discharge pressure and swash-plate angle (i.e., pump flow rate) after instantaneous circuit cutoff and opening were mainly investigated.
It was found that the surge pressure was predominantly influenced by the flow resistances in the passages and the pressure override of the pressure-regulating valve, as well as by the volume of the pump discharge line. In addition, the mathematical model of the pump control system presented in this work, in which all variables were expressed by the state equations, and the numerical calculation method for it could be confirmed to be an effective and generally applicable method for the theoretical analysis of the transient characteristics of these systems.
