G - Physics – 05 – B
Patent
G - Physics
05
B
341/110
G05B 11/42 (2006.01) F02M 19/01 (2006.01) G05B 13/02 (2006.01) H03K 17/66 (2006.01)
Patent
CA 1165425
METHOD OF CONTROLLING PRODUCTION PROCESSES AND APPARATUS THE THEREFOR ABSTRACT OF DISCLOSURE The specification discloses a novel method for controlling pro- duction processes of a pneumatic, electrical or hydraulic nature and appa- ratus therefor. The method, and therefore the apparatus for performing said method, operate on the basis of counteracting any process change by utilizing the difference between a feedback signal related to a current con- dition of the process and a desired value signal related to the desired con- dition of the process, as well as utilizing the rate of change between said feedback signal and said desired value signal. The error difference and rate of change are then utilized to pro- duce a correction signal which is adapted to remain unchanged as long as the process being controlled, and the desired value signal, both remain in static condition, but which also has a unique look ahead feature such that said correction signal attempts to become saturated as soon as a new desired value is supplied, or a process change occurs. The correction signal, if saturated, is brought out of saturation much faster by using both the rate of change of the actual error difference between said desired value and said feedback signals and the actual error difference between said sig- nals in a manner which is much faster than if only the error difference was used. If said correction signal never does reach a saturation point, or if it is saturated, upon becoming unsaturated, the correction signal is then changed much faster than previously possible by using the rate of change of the error difference rather than the error difference only. Further changes to the correction signal occur in a manner described in the specification and then the signal is supplied to a driver of the appropriate type to cause the process to arrive at a desired condition.
330886
Smith Richard L.
Van Allen Kent
Fetherstonhaugh & Co.
Scans Associates Inc.
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