초록 ▼

A multistage thermostat means that is adapted for use with equipment such as a heat pump and auxiliary heat and which effects efficient operation upon a temperature setup after a nigh setback function by introducing an exponential change in the apparent control setpoint. The sensitivity of the signa

A multistage thermostat means that is adapted for use with equipment such as a heat pump and auxiliary heat and which effects efficient operation upon a temperature setup after a nigh setback function by introducing an exponential change in the apparent control setpoint. The sensitivity of the signal processing channel of the system is altered to maintain stability. The system further contains a power-up reset function that also alters the signal processing channel for rapid reestablishment of normal control.

대표청구항 ▼

Multistage thermostat means adapted to operate a heating plant having primary heating means and secondary heating means, including: temperature sensing means having an output signal responsive to an ambient temperature to be controlled by the operation of said heating plant; variable temperature set

Multistage thermostat means adapted to operate a heating plant having primary heating means and secondary heating means, including: temperature sensing means having an output signal responsive to an ambient temperature to be controlled by the operation of said heating plant; variable temperature setpoint means having an output signal to set said thermostat means to control said ambient temperature by the operation of said heating plant; temperature setup and setback means to generate a temperature offset signal; clock means to provide a continuous series of timed intervals; fist summing means having inputs connected to receive said sensing means signal, said temperature offset signal, and to receive said setpoint means signal with said summing means including output means having a signal representative of a current temperature error; previous offset temperature means connected to said offset signal and having a new output signal equal to said offset signal at an interval of time prior to a current interval of time; signal processing means including at least a proportional constant signal processing channel, and an integrating signal processing channel connected in parallel to said first summing means and to a second summing means with said second summing means having an output providing a continuous composite error signal; said integrating signal processing channel including a plurality of gain constants selectively connected to integrator means to provide said integrating signal processing channel with a selectable gain constant; integrator gain control logic means having comparator means and switching means with input means of said integrator gain control logic means connected to respond to said current temperature error and having output means connected to said integrating signal processing channel to operate switch means to select a gain constant for said integrating signal processing channel; exponential decay bias means with said exponential decay bias means having input means including said previous offset temperature means connected to said temperature offset signal, and to said current temperature error signal to cause said exponential decay bias means to generate an exponentially decaying output signal; said exponentially decaying output signal being connected to said first summing means to alter said current temperature error signal when said exponentially decaying output signal is generated; and multistage cycler means having input and output means; said multistage cycler input means connected to receive said continuous composite error signal; said cycler output means adapted to be connected to said heating plant and having a staged output signal responsive to said continuous composite error signal from said signal processing means to progressively stage said primary heating means and said secondary heating means of said heating plant.