Single channel encoder system
US4789874A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1987 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Jul 23, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/45187
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A control system providing a control of position, velocity, and direction of movement of a member in an axis of freedom which employs a scale having scale divisions thereon and bands or zones defining limits of constant velocity control, acceleration and deceleration zone limits, and a rest or parking position. The scale spans and parallels the axis of freedom. A single channel transducer or encoder mounted on and moving with the member produces time varying output signals in response to the sensing of scale divisions along the scale and signals of different characteristic in response to encoder sensing of the limit bands. The time varying output signals are employed as scale division count signals for position determination and as scale division count signals per unit of time, for velocity feedback. The signals of different characteristic produced upon entering and during crossing of the limit bands, are utilized in a system of logic for computing control system signals to compensate control uncertainties in differing functional modes of the control system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.