Thermostat with adaptive operating cycle
US4408711A · kind A · utility
Inventor
Key dates
| Filing date | Jul 26, 1982 |
| Grant date | Oct 11, 1983 |
| Priority date | — |
| Expiry date | Jul 26, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/1917
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electronic thermostat operative to be connected to a furnace or other temperature modifying apparatus, to control its state of operation, includes means for generating a desired temperature set point signal and means for measuring ambient temperature on the thermostat. When the ambient temperature falls below the set point the furnace is energized for a predetermined period of time. The time of energization is increased or decreased by a small increment after each heating cycle depending upon magnitude of the temperature increase which occurred at the thermostat as a result of the heating cycle in order to adaptively achieve a predetermined temperature increase during the heating cycle and the thermal overshoot period which occurs following de-energization of the furnace. In alternative embodiments of the invention the period of time in which the furnace is de-energized between heating cycles is controlled by a timer and adaptively modified in a similar manner, and the time delay between furnace energization and initiation of the blower at the beginning of a heating cycle and de-energization of the blower after the end of the heating cycle are similarly adaptively modified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.