System and method for pressure compensation in a pump
First Claim
1. A method, comprising:
- introducing fluid into a chamber of a pumping apparatus;
determining if a pressure in the chamber is above a desired pressure;
moving a pumping means of the pumping apparatus to increase the volume of the chamber to compensate for the pressure increase if the pressure in the chamber is above a desired pressure; and
dispensing fluid from the chamber, wherein the determination and movement are repeated to substantially maintain substantially the desired pressure until the dispense of fluid is initiated.
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Accused Products
Abstract
Systems and methods for maintaining substantially a baseline pressure in a chamber of a pumping apparatus are disclosed. Embodiments of the present invention may serve to control a motor to compensate or account for a pressure drift which may occur in a chamber of the pumping apparatus. More specifically, a dispense motor may be controlled to substantially maintain a baseline pressure in the dispense chamber before a dispense based on a pressure sensed in the dispense chamber. In one embodiment, before a dispense is initiated a control loop may be utilized such that it is repeatedly determined if the pressure in the dispense chamber is above a desired pressure and, if so, the movement of the pumping means regulated to maintain substantially the desired pressure in the dispense chamber until a dispense of fluid is initiated.
147 Citations
37 Claims
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1. A method, comprising:
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introducing fluid into a chamber of a pumping apparatus;
determining if a pressure in the chamber is above a desired pressure;
moving a pumping means of the pumping apparatus to increase the volume of the chamber to compensate for the pressure increase if the pressure in the chamber is above a desired pressure; and
dispensing fluid from the chamber, wherein the determination and movement are repeated to substantially maintain substantially the desired pressure until the dispense of fluid is initiated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A computer readable medium, comprising instructions translatable for:
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introducing fluid into a chamber of a pumping apparatus;
determining if a pressure in the chamber is above a desired pressure;
moving a pumping means of the pumping apparatus to increase the volume of the chamber to compensate for the pressure increase if the pressure in the chamber is above a desired pressure; and
dispensing fluid from the chamber, wherein the determination and movement are repeated to substantially maintain substantially the desired pressure until the dispense of fluid is initiated. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A system, comprising
a pumping apparatus comprising a feed chamber, a dispense chamber operable to receive fluid for dispense, a pumping means within the dispense chamber and a pressure sensor operable to sense a pressure in the dispense chamber; - and
a controller configured to receive the pressure, determine if the pressure in the chamber is above a desired pressure, regulate the movement of the pumping means to maintain substantially the desired pressure in the dispense chamber and repeat this receiving, determination and regulation until a dispense of fluid is initiated, wherein the controller is further operable to regulate the movement of the pumping means to dispense fluid from the dispense chamber. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification