Automatic temperature and humidity regulation – Distance-adjusted
Reexamination Certificate
1995-10-26
2001-07-24
Wayner, William (Department: 3744)
Automatic temperature and humidity regulation
Distance-adjusted
C236S10100B, C236S084000, C700S031000
Reexamination Certificate
active
06264111
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally relates to a process controller that has either proportional-integral control functionality or proportional-integral-derivative control functionality, and more particularly to such a controller that has adaptive control capability.
There has been a need for controllers for controlling a single variable in many kinds of processes that provides effective control. One of the applications for such controllers is readily apparent to all individuals in an indoor environment is that of temperature control. Ineffective temperature control of an indoor environment is readily apparent to those who are uncomfortable, and there is a continuing need for effective control of heating, ventilating and air conditioning systems in all types of buildings.
Controllers have been developed which are increasingly more sophisticated, and with advancements in electronic technology, more robust control capability can be achieved and implemented at reasonable cost. Controllers which control a single loop, i.e., control a single variable such as temperature, humidity or the like, by controlling an output have been implemented, and improved control has been achieved by implementing control schemes which include three separate factors or components. These include a proportional gain factor, an integral gain factor and a derivative gain factor. Such PID controllers can provide better control because they determine the derivative as well as the integral of change of the error over time, in addition to the error that is determined at a particular time, to control the controlled variable.
While such PID controllers offer many advantages over controllers which merely provide proportional control, there is a need for improved PID controllers for particular applications and uses.
Accordingly, it is a primary object of the present invention to provide an improved PID controller that has adaptive control capability that has many possible applications.
Another object of the present invention is to provide an improved PID controller having adaptive control capability that is particularly suited for controlling a single control loop, i.e., a single variable is controlled and provides a single output.
Yet another object of the present invention is to provide such an improved adaptive controller for controlling a single loop, but also has the capability of operating in series with other single control loops.
Still another object of the present invention is to provide such an improved adaptive controller that has the capability of operating in a cascaded configuration of control loops.
Another object of the present invention is to provide such an improved adaptive controller that utilizes an internal model of the application that is to be controlled, which model matches the expected application, and which during operation, tunes itself in response to load, equipment or time changes.
A related object lies in the provision of examining the input, comparing the input with what it should be and then changes the parameters within the internal model to move actual conditions closer to the desired condition, and provide control of the output in accordance with the changed internal model.
A detailed object of the present invention is to provide an improved thermostat which also has the capability of providing adaptive control, i.e., during operation, it will monitor itself in terms of its effectiveness in control, and will generate more effective operating parameters within specific algorithms to provide more accurate control.
REFERENCES:
patent: 4172555 (1979-10-01), Levine
patent: 4298946 (1981-11-01), Hartsell et al.
patent: 4349866 (1982-09-01), Browe
patent: 4388692 (1983-06-01), Jones et al.
patent: 4410132 (1983-10-01), Levine
patent: 4442972 (1984-04-01), Sahay et al.
patent: 4639876 (1987-01-01), Deeds
patent: 4646964 (1987-03-01), Parker et al.
patent: 4688547 (1987-08-01), Ballard et al.
patent: 4702305 (1987-10-01), Beckey et al.
patent: 4799176 (1989-01-01), Cacciatore
patent: 4829458 (1989-05-01), Russo et al.
patent: 4897798 (1990-01-01), Cler
patent: 4942613 (1990-07-01), Lynch
patent: 4991770 (1991-02-01), Bird et al.
patent: 5207379 (1993-05-01), Hurmi et al.
patent: 5537310 (1996-07-01), Tanakfe et al.
patent: 5634590 (1997-06-01), Gorski et al.
Preliminary Product Description, “SOLOView” American Auto-Matrix, Inc., Oct. 29, 1992, pp. 1-3.
Advertising brochure, “Advanced Concepts for VAV Control”, Alerton Technologies, Inc., date unknown.
A Landis & Gyr Powers, Inc. Technical Instruction brochure entitled “TH 192 S Single Temperature Room Thermostat”, Jan. 1990.
Nicolson John C.
Schuster Guido M.
Greer Burns & Crain Ltd.
Siemens Building Technologies Inc.
Wayner William
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