Method for predicting steady-state conditions

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

1982-09-07

1989-11-21

Lall, Parshotam S.

Boots, shoes, and leggings

73 611C, 210101, 210659, 210741, 364558, G06F 1546, B01B 1305

Patent

active

048827819

ABSTRACT:
To stablize 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, the control system 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: 4059009 (1977-11-01), Ball et al.
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: 4311586 (1982-01-01), Baldwin et al.
patent: 4422942 (1983-12-01), Allington

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