Thermostat with means for disabling pid control

Details Thermostat with means for disabling pid control Thermostat with means for disabling pid control

G - Physics

05

D

341/32.5

G05D 23/20 (2006.01) G05B 5/01 (2006.01) G05B 11/42 (2006.01) G05D 23/19 (2006.01)

Patent

CA 2039096

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.

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