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公开(公告)号：US11920581B2
公开(公告)日：2024-03-05
申请号：US17162973
申请日：2021-01-29
申请人： Masterflex, LLC
发明人： Phuong Le Pham
CPC分类号： F04B49/20 , F04B43/08 , F04B49/065 , F04B49/103 , F04B43/12 , F04B2201/1201 , F04B2203/0209 , F04B2205/09 , F04B2207/043
摘要： 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.
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公开(公告)号：US11846279B2
公开(公告)日：2023-12-19
申请号：US17162908
申请日：2021-01-29
申请人： Masterflex, LLC
发明人： Phuong Le Pham
CPC分类号： F04B49/065 , F04B43/08 , F04B43/09 , F04B49/103 , F04B49/106 , F04B2201/1201 , F04B2205/09
摘要： 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.
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