Method for predicting steady-state conditions

Details Method for predicting steady-state conditions Method for predicting steady-state conditions

1985-10-15

1991-08-13

Teska, Kevin J.

Boots, shoes, and leggings

73 1904, 73 2323, 73 2324, 210659, 364496, 364558, G06F 1546, B01D 1508

Patent

active

050401262

ABSTRACT:
To stabilize flow rate in a single-stroke, syringe-type high pressure pump to a constant value after turn-on, a control system; (1) in one embodiment, senses the maximum rate of change of pressure, detects a pressure when the rate of change is two-thirds of the maximum, increases the pump rate until the pressure is three times that at the value of the detected pressure and begins pumping at the preset constant flow rate; and (2) in another embodiment operates a pump system at a flow rate ten times the preset flow rate and, when the time derivative of the pressure has dropped to nine tenths of its maximum, the pump motor speed is reduced to the preset flow rate.

REFERENCES:
patent: 3872723 (1975-03-01), Busch
patent: 4233156 (1980-11-01), Tsukada et al.
patent: 4275439 (1981-06-01), Kuwata
patent: 4277832 (1981-07-01), Wong
patent: 4310420 (1982-01-01), Konishi et al.
patent: 4422942 (1983-12-01), Allington

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