Attention is drawn to the notes (particularly the definition of the term "variable") on page 1 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".
"Proportional band" means that range of values of deviation which corresponds to the full operating range of output signal of the controlling unit resulting from proportional action only.
This sub-class comprises only (a) systems for regulation of non-electric variables and (b) systems for control of non-electric variables and involving comparison between the actual and desired values of the variables to be controlled.
The term "systems" in this sub-class includes self-contained devices such as speed governors, pressure regulators.
Features of general applicability to regulating systems, e.g. anti-hunting arrangements, are classified in sub-class Fulltext... Hierarchy... Expanded...G05B.
Control systems designed specifically for particular apparatus, machines, or processes are normally classified in the sub-classes for the apparatus, machines, or processes.
counterbalanced by spider springs acting immediately upon the fly-weights
G05D 13/20
· · ·
counterbalanced by spider springs acting upon the articulated riser
G05D 13/22
· · ·
counterbalanced by fluid pressure acting upon the articulated riser
G05D 13/24
· · ·
counterbalanced by two or more different appliances acting simultaneously upon the riser, e.g. with both spring force and fluid pressure, with both spring force and electromagnetic force
G05D 13/26
· · ·
with provision for modulating the degree of non-uniformity of speed
G05D 13/28
· · ·
with provision for performing braking effects in case of increased speed
G05D 13/30
· ·
Governors characterised by fluid features in which the speed of a shaft is converted into fluid pressure (transducers converting variations of physical quantities into fluid-pressure variations Fulltext... Hierarchy... Expanded...F15B 5/00)
using regulating devices with proportional band, i.e. P. regulating devices
G05D 13/38
· · ·
involving centrifugal governors of fly-weight type
G05D 13/40
· · ·
involving fluid governors of pump type
G05D 13/42
· · ·
involving fluid governors of flow-controller type, i.e. the width of liquid flow being controlled by fly-weights
G05D 13/44
· · ·
involving fluid governors of jet type
G05D 13/46
· ·
using regulating devices with proportional band and integral action, i.e. P.I. regulating devices
G05D 13/48
· · ·
involving resilient restoring mechanisms
G05D 13/50
· · ·
involving connecting means for superimposing a proportional regulating device and an integral regulating device
G05D 13/52
· ·
using regulating devices with proportional band and derivative action, i.e. P.D. regulating devices
G05D 13/54
· · ·
involving centrifugal governors of fly-weight type exerting an acceleratory effect
G05D 13/56
· · ·
involving restoring mechanisms exerting a delay effect
G05D 13/58
· · ·
involving means for connecting a speed-regulating device and an acceleration-regulating device
G05D 13/60
· ·
using regulating devices with proportional band, derivative, and integral action, i.e. P.I.D. regulating devices
G05D 13/62
·
characterised by the use of electric means, e.g. use of a tachometric dynamo, use of a transducer converting an electric value into a displacement
G05D 13/64
·
Compensating the speed difference between engines meshing by a differential gearing or the speed difference between a controlling shaft and a controlled shaft
G05D 13/66
·
Governor units providing for co-operation with control dependent upon a variable other than speed
G05D 15/00
Control of mechanical force or stress; Control of mechanical pressure
Modifications to reduce the effects of instability, e.g. due to vibrations, friction, abnormal temperature, overloading, unbalance (vibration-dampers Fulltext... Hierarchy... Expanded...F16F 7/00)
G05D 16/04
·
without auxiliary power
G05D 16/06
· ·
the sensing element being a flexible member yielding to pressure, e.g. diaphragm, bellows, capsule
the sensing element having a resistance varying with temperature, e.g. thermistor
G05D 23/26
· · ·
the sensing element having a permeability varying with temperature
G05D 23/27
· ·
with sensing element responsive to radiation
G05D 23/275
· ·
with sensing element expanding, contracting, or fusing in response to changes of temperature
G05D 23/30
· ·
Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature (automatic controllers in general and not restricted to control of temperature Fulltext... Hierarchy... Expanded...G05B)
G05D 23/32
· · ·
with provision for adjustment of the effect of the auxiliary heating device, e.g. as a function of time