System and method for pressure compensation in a pump

摘要

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.

主权项

1. A system, comprising:
a pumping apparatus comprising a chamber for receiving a fluid for dispense, a pump within the chamber and a sensor to sense a pressure in the chamber; and a controller configured to receive the pressure of the fluid in the chamber of the pumping apparatus from the sensor, determine if the pressure in the chamber is above a desired pressure, move the pump of the pumping apparatus to increase the volume of the chamber to compensate for a pressure increase if the pressure in the chamber is above the desired pressure, and send a signal to the pump to dispense fluid from the chamber, wherein the determination and movement are repeated to maintain substantially the desired pressure until the dispense of fluid is initiated.