Method for predicting steady-state conditions
US5040126A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 1985 |
| Grant date | Aug 13, 1991 |
| Priority date | — |
| Expiry date | Oct 15, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/326
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.