Phuong T Pham

US Patent:

20220243719, Aug 4, 2022

Filed:

Jan 29, 2021

Appl. No.:

17/162908

Inventors:

- Radnor PA, US
Phuong Le PHAM - Mount Prospect IL, US

International Classification:

F04B 49/06
F04B 49/10

Abstract:

Aspects are provided for positive displacement pumps and methods and systems for controlling such positive displacement pumps for accurate volume dispensing. The pump may run a calibration procedure to determine a mapping between a pump speed and a flow rate for a current configuration of the positive displacement pump, a tubing size, and a fluid characteristic. A pump controller may determine a pump motion profile based on the mapping. The pump motion profile includes an acceleration phase, a constant speed phase, and a deceleration phase such that a total volume pumped according to the pump motion profile and the mapping is equal to a target volume. The pump controller may determine an adjustment to the pump motion profile based on a constant flow rate measured during operation. The pump controller may decelerate the positive displacement pump according to the adjusted pump motion profile until the target volume is dispensed.

US Patent:

20220243721, Aug 4, 2022

Filed:

Jan 29, 2021

Appl. No.:

17/162973

Inventors:

- Radnor PA, US
Phuong Le PHAM - Mount Prospect IL, US

International Classification:

F04B 49/20
F04B 49/06
F04B 49/10

Abstract:

Aspects are provided for positive displacement pumps and methods and systems for controlling such pumps for dispensing at a flow rate based on a downstream flow sensor. A pump controller determines a targeted motor speed for a flow rate set point based on a flow rate function. The pump controller determines a predicted movement time for a motor of the pump to change from a current motor speed to the targeted motor speed, a predicted wait time to reach a flow rate corresponding to the targeted motor speed, and a measurement time after the wait time. The pump controller controls the positive displacement pump according to consecutive control cycles, each control cycle includes a pump movement sub-cycle, a wait sub-cycle, and a measurement sub-cycle. The pump controller determines a measured flow rate during the measurement sub-cycle. A subsequent control cycle is based on the measured flow rate.