Method of controlling production processes and apparatus therefor
US4250543A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1978 |
| Grant date | Feb 10, 1981 |
| Priority date | — |
| Expiry date | Jul 21, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/667
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The specification discloses a novel method for controlling production processes of a pneumatic, electrical or hydraulic nature and apparatus therefor. The method, and therefore the apparatus for performing said method, counteracts any process change by utilizing the error difference and the rate of change of the error difference between a feedback signal related to a current condition of the process and a desired value related to the desired condition of the process. The error difference and rate of change and then utilized to produce a correction signal which is adapted to remain unchanged as long as the process being controlled, and the desired value signal, both remain in static condition, but which also has a unique look ahead feature such that said correction signal attempts to become saturated as soon as a new desired value is supplied, or a process change occurs. The correction signal, if saturated, is brought out of saturation much faster by using both the rate of change of the actual error difference between said desired value and said feedback signals and the actual error difference between said signals in a manner which is much faster than if only the error difference wa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.