Bang-bang dual-mode integral controller with proportional contro

Details Bang-bang dual-mode integral controller with proportional contro Bang-bang dual-mode integral controller with proportional contro

1982-12-10

1985-01-29

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219216, 219501, 323235, H05B 102

Patent

active

044968299

ABSTRACT:
Control system which measures overshoot or undershoot time of a controlled variable with respect to a set value and adjusts a proportional count if the overshoot or undershoot time period exceeds fixed values. The proportional count is used to control the system output in a proportional manner, such as supplying k out of every n cycles of power, where k represents the proportional count. To prevent excessively long periods of overshoot or undershoot, an overlimit detector provides adjustments of the proportional count when the overshoot or undershoot measured time exceeds an overlimit value.
The control system has general applicability but is described in the temperature control of a fuser hot roll such as used in electrophotostatic copiers.

REFERENCES:
patent: 3878358 (1975-04-01), Barton et al.
patent: 3924170 (1975-12-01), Foster
patent: 4300037 (1981-11-01), Padder

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