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A Double-setpoint control is quite similar to
A Double-setpoint control is quite similar to bang–bang control
In control theory, a bang–bang controller (2 step or on–off controller), is a feedback controller that switches abruptly between two states. These controllers may be realized in terms of any element that provides hysteresis. They are often use ...
. It is an element of a feedback-loop and therefore evaluated by application of control theory
Control theory is a field of mathematics that deals with the control of dynamical systems in engineered processes and machines. The objective is to develop a model or algorithm governing the application of system inputs to drive the system to a ...
. It has two setpoints on which it switches abruptly usually involving a hysteresis. It may be used in a heating and cooling situation or for two speed control.
The theory was examined by J. Gregory Vermeychuk. The "double-bang-bang" was implemented in the Luft Instruments Model 77 Controller used in a variety of laboratory (titrations) and plant application. Shown in Harvard University Science Museum.
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