Thermostat with means for disabling PID control

Details Thermostat with means for disabling PID control Thermostat with means for disabling PID control

1990-03-27

1991-02-12

Wayner, William E.

Automatic temperature and humidity regulation

Humidity control

236 78D, 318610, 364162, G05B 1302

Patent

active

049917706

ABSTRACT:
A thermostat is disclosed which includes a Proportional-Integral-Derivative (PID) controller and a means for disabling the PID controller for selected periods. The PID controller is disabled during a temperature recovery period, which can be triggered by the occurrence of one or more of many preselected events. The PID controller is re-enabled when the thermostat setpoint less a void offset temperature is reached. To reduce error in future temperature recovery periods, the void offset temperature is adjusted after a temperature recovery by adding the amount of error to the void offset temperature to create a new void offset temperature for use in a next temperature recovery period.

REFERENCES:
patent: 3938017 (1976-02-01), Hayes
patent: 4615380 (1980-10-01), Beckey
patent: 4702413 (1987-10-01), Beckey et al.
patent: 4848099 (1989-07-01), Beckey et al.

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