Attention is drawn to the notes (particularly the definition of the term "variable") on page G 3 of this elaboration.
This class covers methods, systems, and apparatus for controlling in general.
In this class, the following terms are used with the meanings indicated:
"Controlling" means influencing a variable in any way, e.g. changing its direction or its value (including changing it to or from zero), maintaining it constant, limiting its range of variation.
"Regulation" means maintaining a variable automatically at a desired value or within a desired range of values. The desired value or range may be fixed, or manually varied, or may vary with time according to a predetermined "programme" or according to variation of another variable. Regulation is a form of control; the term "automatic control" is often used in the art as a synonym for "regulation".
Applications of control systems or elements for regulating specific variables are covered by sub-classes Fulltext... Hierarchy... Expanded...G05D, Fulltext... Hierarchy... Expanded...G05F, and not by this sub-class. However, features of such systems or elements which are clearly more generally applicable are classified in this sub-class.
In this sub-class:
The term "automatic controller" means a system, circuit, or device in which a signal from the detecting element is compared with a signal representing the desired value and which operates in such a way as to reduce the deviation. The automatic controller generally does not include the sensitive element, i.e. that element which measures the value of the condition to be corrected, or the correcting element, i.e. that element which adjusts the condition to be corrected.
The term "electric" is intended to include "electromechanical", "electrohydraulic", and "electropneumatic".
Details of specific control systems are classified in the group relevant to the system, if not otherwise provided for.
G05B 1/00
Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values (comparing phase or frequency of two electric signals Fulltext... Hierarchy... Expanded...H03D 13/00)
G05B 1/01
·
electric [2]
G05B 1/02
· ·
for comparing analogue signals [2]
G05B 1/03
· ·
for comparing digital signals [2]
G05B 1/04
· ·
with sensing of the position of the pointer of a measuring instrument
in which the output signal represents a continuous function of the deviation from the desired value, i.e. continuous controllers (Fulltext... Hierarchy... Expanded...G05B 11/26 takes precedence)
G05B 11/10
· · ·
the signal transmitted being dc
G05B 11/12
· · ·
the signal transmitted being modulated on an ac carrier
G05B 11/14
· ·
in which the output signal represents a discontinuous function of the deviation from the desired value, i.e. discontinuous controllers (Fulltext... Hierarchy... Expanded...G05B 11/26 takes precedence)
G05B 11/16
· · ·
Two-step controllers, e.g. with on/off action
G05B 11/18
· · ·
Multi-step controllers
G05B 11/26
· ·
in which the output signal is a pulse-train
G05B 11/28
· · ·
using pulse-height modulation; using pulse-width modulation
G05B 11/30
· · ·
using pulse-frequency modulation
G05B 11/32
· ·
with inputs from more than one sensing element; with outputs to more than one correcting element
G05B 11/36
· ·
with provision for obtaining particular characteristics, e.g. proportional, integral, differential
G05B 11/38
· · ·
for obtaining a proportional characteristic
G05B 11/40
· · ·
for obtaining an integral characteristic
G05B 11/42
· · ·
for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
G05B 11/44
·
pneumatic only
G05B 11/46
· ·
without auxiliary power
G05B 11/48
· ·
with auxiliary power
G05B 11/50
· · ·
in which the output signal represents a continuous function of the deviation from the desired value, i.e. continuous controllers
G05B 11/52
· · ·
in which the output signal represents a discontinuous function of the deviation from the desired value, i.e. discontinuous controllers
G05B 11/54
· · · ·
Two-step controllers, e.g. with on/off action
G05B 11/56
· · · ·
Multi-step controllers
G05B 11/58
· ·
with inputs from more than one sensing element; with outputs to more than one correcting element
G05B 11/60
·
hydraulic only
G05B 13/00
Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion (details of the computer Fulltext... Hierarchy... Expanded...G06F 15/18)
Numerical programme control not using a measuring device, e.g. using stepping motor
G05B 19/42
· ·
Recording and playback systems, i.e. in which the programme is recorded from a cycle of operations, e.g. the cycle of operations being manually controlled, after which this record is played back on the same machine