Pumps – Processes
Patent
1997-03-24
1998-10-13
Thorpe, Timothy
Pumps
Processes
417 26, 417 29, 417 34, 417295, 417310, F04B 4900
Patent
active
058203524
ABSTRACT:
A method for controlling compressor discharge pressure in a compressor. The compressor comprising a compression module driven by a prime mover, the compression module having a discharge port through which a compressed fluid is discharged with a discharge pressure, and an inlet through which uncompressed fluid is flowed into the compression chamber, the flow of fluid through the inlet controlled by an inlet valve repositionable by an actuator driven by a motor. The method comprising the steps of running a discharge pressure control routine, comprising the steps of: calculating the difference between the actual discharge pressure and a predetermined setpoint discharge pressure; computing the required change in valve position to achieve the setpoint discharge pressure, the period of time the motor means must be energized to produce the change in valve position, and the direction the valve must be moved to produce the setpoint discharge pressure. The method including the additional steps of running an actuator position control routine, comprising the steps of: energizing the motor in the required direction for the computed period of time; and braking the motor by energizing the motor in a direction different than the required direction for a braking time interval.
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Gerhardt Don John
Gunn John T.
Harden William H.
Gnibus Michael M.
Ingersoll-Rand Company
Kim Ted
Thorpe Timothy
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