Precision pneumatic pressure supply system
US4086804A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1976 |
| Grant date | May 2, 1978 |
| Priority date | — |
| Expiry date | Oct 26, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7761
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A dual closed loop, precision pneumatic pressure selection, control and display system for use in testing pneumatic apparatus provides precision digital high response analog control of a precision pneumatic valve for establishing, maintaining, and displaying selected reference pressures and rates of change thereof as a ratio between a regulated pressure and a vacuum, the resultant pressure being sensed by a precision pressure sensor of the vibrating diaphragm type. The first closed loop is a digital loop, the desired reference pressure or pressure rate being commanded in any desired pneumatic unit of measure as a binary coded decimal signal and converted to a common unit of measure. The output of the pressure sensor responsive to valve operation is converted to a binary coded decimal signal in said common units, these two signals being digitally compared and the difference between them being converted to an analog signal for adjusting the valve, thereby maintaining the selected pressure. The second loop is a high response, high resolution analog control loop system wherein the analog error signal of the first loop controls valve position, a further output of the pressure sensor bei…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.