SYSTEM AND METHOD FOR CONTROLLING MOTION PROFILE OF PISTONS

摘要

A method includes driving a fluid pumping unit having a plurality of pumping cylinders via a plurality of hydraulic cylinders respectively of a hydraulic power unit. The method further includes controlling activation of the hydraulic power unit such that each stroke of the corresponding piston assembly between the top dead center and the bottom dead center follows a corresponding trapezoidal velocity profile with respect to a time duration. Controlling activation includes controlling flow of a hydraulic fluid in the hydraulic power unit so as to control the corresponding trapezoidal velocity profile with respect to the time duration of the corresponding piston assembly to obtain a predefined flow rate of the fluid medium from the pumping unit.

主权项

1. A method comprising:
driving a fluid pumping unit comprising a plurality of pumping cylinders via a plurality of hydraulic cylinders respectively of a hydraulic power unit; wherein driving the fluid pumping unit comprises:
moving a corresponding piston assembly within each corresponding pumping cylinder between a top dead center and a bottom dead center within each corresponding pumping cylinder so as to intake a fluid medium into each corresponding pumping cylinder, eject the intake fluid medium from each corresponding pumping cylinder; intake brine into each corresponding pumping cylinder, and eject brine from each corresponding pumping cylinder during each stroke of the corresponding piston assembly between the top dead center and the bottom dead center; and controlling activation of the hydraulic power unit such that each stroke of the corresponding piston assembly between the top dead center and the bottom dead center follows a corresponding trapezoidal velocity profile with respect to a time duration; wherein controlling activation comprises:
controlling flow of a hydraulic fluid in the hydraulic power unit so as to control the corresponding trapezoidal velocity profile with respect to the time duration of the corresponding piston assembly to obtain a predefined flow rate of the fluid medium from the pumping unit.