|  | G |
SECTION G — PHYSICS

|  | G |
Note(s) In this section, the following term is used with the meaning indicated: "variable" (as a noun) means a feature or property (e.g., a dimension, a physical condition such as temperature, a quality such as density or colour) which, in respect of a particular entity (e.g., an object, a quantity of a substance, a beam of light) and at a particular instant, is capable of being measured; the variable may change, so that its numerical expression may assume different values at different times, in different conditions or in individual cases, but may be constant in respect of a particular entity in certain conditions or for practical purposes (e.g., the length of a bar may be regarded as constant for many purposes). Attention is drawn to the definitions of terms or expressions used, appearing in the notes of several of the classes in this section, in particular those of "measuring" in class Fulltext... Hierarchy... Expanded...G01 and "control" and "regulation" in class Fulltext... Hierarchy... Expanded...G05. Classification in this section may present more difficulty than in other sections, because the distinction between different fields of use rests to a considerable extent on differences in the intention of the user rather than on any constructional differences or differences in the manner of use, and because the subjects dealt with are often in effect systems or combinations, which have features or parts in common, rather than "things", which are readily distinguishable as a whole. For example, information (e.g., a set of figures) may be displayed for the purpose of education or advertising (Fulltext... Hierarchy... Expanded...G09), for enabling the result of a measurement to be known (Fulltext... Hierarchy... Expanded...G01), for signalling the information to a distant point or for giving information which has been signalled from a distant point (Fulltext... Hierarchy... Expanded...G08). The words used to describe the purpose depend on features that may be irrelevant to the form of the apparatus concerned, for example, such features as the desired effect on the person who sees the display, or whether the display is controlled from a remote point. Again, a device which responds to some change in a condition, e.g., in the pressure of a fluid, may be used, without modification of the device itself, to give information about the pressure (Fulltext... Hierarchy... Expanded...G01L) or about some other condition linked to the pressure (another subclass of class Fulltext... Hierarchy... Expanded...G01, e.g., Fulltext... Hierarchy... Expanded...G01K for temperature), to make a record of the pressure or of its occurrence (Fulltext... Hierarchy... Expanded...G07C), to give an alarm (Fulltext... Hierarchy... Expanded...G08B), or to control another apparatus (Fulltext... Hierarchy... Expanded...G05). The classification scheme is intended to enable things of a similar nature (as indicated above) to be classified together. It is therefore particularly necessary for the real nature of any technical subject to be decided before it can be properly classified.

INSTRUMENTS

|  | G05 |
CONTROLLING; REGULATING

|  | G05 |
Note(s) This class covers methods, systems, and apparatus for controlling, in general. In this class, the following terms or expressions 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; "automatic control" is often used in the art as a synonym for "regulation". Attention is drawn to the Notes following the title of section G, especially as regards the definition of the term "variable".

|  | G05D |
SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES (for continuous casting of metals Fulltext... Hierarchy... Expanded...B22D 11/16; valves per se Fulltext... Hierarchy... Expanded...F16K; sensing non-electric variables, see the relevant subclasses of Fulltext... Hierarchy... Expanded...G01; for regulating electric or magnetic variables Fulltext... Hierarchy... Expanded...G05F)

|  | G05D |
3. Note(s) This subclass does not cover features of general applicability to regulating systems, e.g. anti-hunting arrangements, which are covered by subclass Fulltext... Hierarchy... Expanded...G05B. In this subclass, the following term is used with the meaning indicated: "systems" includes self-contained devices such as speed governors, pressure regulators. Control systems specially adapted for particular apparatus, machines or processes are classified in the subclasses for the apparatus, machines or processes, provided that there is specific provision for control or regulation relevant to the special adaptation, either at a detailed level (e.g. Fulltext... Hierarchy... Expanded...A21B 1/40: "for regulating temperature in bakers' ovens") or at a general level (e.g. Fulltext... Hierarchy... Expanded...B23K 9/095: "for automatic control of welding parameters in arc welding"). Otherwise, classification is made in the most appropriate place in this subclass. The following are lists of places where there is specific provision of the kind referred to above. Where such provision is at a detailed level, the places have been grouped according to the main groups of this subclass. Where the provision is at a general level (e.g. of a kind appropriate to more than one of the main groups specified in the lists, or to main groups Fulltext... Hierarchy... Expanded...G05D 27/00 or Fulltext... Hierarchy... Expanded...G05D 29/00), the places are listed under the title "General References". Places related to Fulltext... Hierarchy... Expanded...G05D 1/00
   Fulltext... Hierarchy... Expanded...A01B 69/00 | Agricultural machines or implements |
   Fulltext... Hierarchy... Expanded...A63H 17/36 | Toy vehicles |
   Fulltext... Hierarchy... Expanded...B60V 1/11 | Air-cushion vehicles |
   Fulltext... Hierarchy... Expanded...B60W 30/10 | Road vehicle path control [8] |
   Fulltext... Hierarchy... Expanded...B62D 1/00 | Steering controls of motor vehicles or trailers, i.e. means for initiating a change of direction |
   Fulltext... Hierarchy... Expanded...B62D 6/00 | Arrangements for automatically controlling the steering depending on driving conditions |
   Fulltext... Hierarchy... Expanded...B62D 55/116 | Chassis of endless-tracked vehicles |
   Fulltext... Hierarchy... Expanded...B63H 25/00 | Marine steering; control of waterborne vessels |
   Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...B64C 13/00-B64C 15/00 | Controlling aircraft |
   Fulltext... Hierarchy... Expanded...B64D 25/11 | Controlling attitude or direction of aircraft ejector seats |
   Fulltext... Hierarchy... Expanded...B64G 1/24 | Cosmonautic vehicles |
   Fulltext... Hierarchy... Expanded...F41G 7/00 | Self-propelled missiles |
   Fulltext... Hierarchy... Expanded...F42B 15/01 | Guided missiles |
   Fulltext... Hierarchy... Expanded...F42B 19/01 | Marine torpedoes |
   Places related to Fulltext... Hierarchy... Expanded...G05D 3/00
   Fulltext... Hierarchy... Expanded...A43D 119/00 | Footwear manufacture |
   Fulltext... Hierarchy... Expanded...B21K 31/00 | Tool carriers in forging or pressing |
   Fulltext... Hierarchy... Expanded...B23B 39/26 | Pattern-controlled boring or drilling tools |
   Fulltext... Hierarchy... Expanded...B23D 1/30, Fulltext... Hierarchy... Expanded...B23D 3/06, Fulltext... Hierarchy... Expanded...B23D 5/04 | Planing or slotting machines controlled by copying device |
   Fulltext... Hierarchy... Expanded...B23H 7/18 | Electrode to workpiece spacing in electric discharge and electrochemical machining |
   Fulltext... Hierarchy... Expanded...B23K 26/02 | Workpiece in laser welding or cutting |
   Fulltext... Hierarchy... Expanded...B23K 37/04 | Workpiece in welding |
   Fulltext... Hierarchy... Expanded...B23K 37/06 | Molten metal in welding |
   Fulltext... Hierarchy... Expanded...B23Q 5/20 | Spindles in machine tools |
   Fulltext... Hierarchy... Expanded...B23Q 15/00, Fulltext... Hierarchy... Expanded...B23Q 16/00 | Tool or work position in machine tools |
   Fulltext... Hierarchy... Expanded...B23Q 35/00 | Tools controlled by pattern or master model |
   Fulltext... Hierarchy... Expanded...B24B 17/00 | Grinding controlled by patterns, drawings, magnetic tape or the like |
   Fulltext... Hierarchy... Expanded...B24B 47/22 | Starting position in grinding |
   Fulltext... Hierarchy... Expanded...B30B 15/24 | Actuating members in presses |
   Fulltext... Hierarchy... Expanded...B62D 55/116 | Chassis of tracked vehicles |
   Fulltext... Hierarchy... Expanded...B65H 23/18 | Web-advancing mechanisms |
   Fulltext... Hierarchy... Expanded...E02F 3/43 | Dippers or buckets in dredgers |
   Fulltext... Hierarchy... Expanded...F15B 9/00 | Fluid-pressure servomotors with follow-up action |
   Fulltext... Hierarchy... Expanded...F24J 2/38 | Tracking of solar heat collectors |
   Fulltext... Hierarchy... Expanded...G03F 9/00 | Photomechanical production of patterned or textured surfaces |
   Fulltext... Hierarchy... Expanded...G11B 5/588 | Rotating heads in information storage systems |
   Fulltext... Hierarchy... Expanded...G21C 7/12 | Movement of control elements in nuclear reactors |
   Places related to Fulltext... Hierarchy... Expanded...G05D 5/00
   Fulltext... Hierarchy... Expanded...A24B 7/14 | Tobacco cutting |
   Fulltext... Hierarchy... Expanded...B05C 11/02 | Thickness of coating of fluent material on surface |
   Fulltext... Hierarchy... Expanded...B21B 37/16 | Thickness, width, diameter or other transverse dimensions of the products of metal-rolling mills |
   Fulltext... Hierarchy... Expanded...C03B 18/04 | Dimension of glass ribbon |
   Fulltext... Hierarchy... Expanded...D21F 7/06 | Thickness of layer in paper making |
   Places related to Fulltext... Hierarchy... Expanded...G05D 7/00
   Fulltext... Hierarchy... Expanded...A45D 20/26 | Air in hair drying helmets |
   Fulltext... Hierarchy... Expanded...A61M 5/168 | Flow of media to the human body |
   Fulltext... Hierarchy... Expanded...B03C 3/36 | Gases or vapour in electrostatic separators |
   Fulltext... Hierarchy... Expanded...B05C 11/10 | Fluent material in coating devices |
   Fulltext... Hierarchy... Expanded...B67D 1/12 | Dispensing beverages on draught |
   Fulltext... Hierarchy... Expanded...B67D 5/28 | Transferring liquids |
   Fulltext... Hierarchy... Expanded...C10K 1/28 | Gas purifiers |
   Fulltext... Hierarchy... Expanded...E21B 21/08 | Flushing boreholes |
   Fulltext... Hierarchy... Expanded...E21B 43/12 | Obtaining liquids from wells |
   Fulltext... Hierarchy... Expanded...F01D 17/00 | Flow in non-positive-displacement machines or systems |
   Fulltext... Hierarchy... Expanded...F01M 1/16 | Lubrication arrangements |
   Fulltext... Hierarchy... Expanded...F01P 7/00 | Coolant flow in cooling devices |
   Fulltext... Hierarchy... Expanded...F02C 9/16, Fulltext... Hierarchy... Expanded...F02C 9/50 | Gas-turbine working fluid |
   Fulltext... Hierarchy... Expanded...F16L 55/027 | Throttle passages in pipes |
   Fulltext... Hierarchy... Expanded...F24F 11/00 | Air-flow or supply of heating or cooling fluids in air treatment arrangements |
   Fulltext... Hierarchy... Expanded...F26B 21/12 | Air or gas flow in dryers |
   Fulltext... Hierarchy... Expanded...G01G 11/08 | Continuous flow weighing apparatus |
   Fulltext... Hierarchy... Expanded...G21D 3/14 | Coolant in nuclear power plant |
   Places related to Fulltext... Hierarchy... Expanded...G05D 9/00
   Fulltext... Hierarchy... Expanded...B01D 21/34 | Liquid level in sedimentation arrangements |
   Fulltext... Hierarchy... Expanded...B41L 27/04 | Ink level in printing, manifolding or duplicating arrangements |
   Fulltext... Hierarchy... Expanded...F22D 5/00 | Feed water for boilers |
   Fulltext... Hierarchy... Expanded...H01J 1/10, Fulltext... Hierarchy... Expanded...H01J 13/14 | Liquid pool electrodes in electric discharge tubes or lamps |
   Places related to Fulltext... Hierarchy... Expanded...G05D 11/00
   Fulltext... Hierarchy... Expanded...B01D 21/32 | Density in sedimentation arrangements |
   Fulltext... Hierarchy... Expanded...B01F 15/04 | Mixers |
   Fulltext... Hierarchy... Expanded...B24C 7/00 | Abrasive blasts |
   Fulltext... Hierarchy... Expanded...B28C 7/00 | Mixtures of clays or cements |
   Fulltext... Hierarchy... Expanded...B65G 53/66 | Bulk material conveyers |
   Fulltext... Hierarchy... Expanded...F02K 3/075 | Flow ratio in jet-propulsion plants |
   Places related to Fulltext... Hierarchy... Expanded...G05D 13/00
   Fulltext... Hierarchy... Expanded...B21C 1/12 | Drum speed in metal drawing |
   Fulltext... Hierarchy... Expanded...B23Q 15/00 | Cutting velocity of tool or work |
   Fulltext... Hierarchy... Expanded...B30B 15/20 | Ram speed in presses |
   Fulltext... Hierarchy... Expanded...B60K 31/00 | Setting or limiting speed of vehicles |
   Fulltext... Hierarchy... Expanded...B60L 15/00 | Electrically-propelled vehicles |
   Fulltext... Hierarchy... Expanded...B60W 30/14 | Road vehicle cruise control [8] |
   Fulltext... Hierarchy... Expanded...B64D 31/08 | Cruising speed of aircraft |
   Fulltext... Hierarchy... Expanded...D01D 1/09 | Feed rate in manufacture of artificial filaments, threads, fibres, bristles or ribbons |
   Fulltext... Hierarchy... Expanded...D01G 15/36 | Carding machines |
   Fulltext... Hierarchy... Expanded...D02H 13/14 | Warping, beaming or leasing machines |
   Fulltext... Hierarchy... Expanded...D03D 51/16 | Cyclically varying speed of looms |
   Fulltext... Hierarchy... Expanded...G01N 30/32 | Speed of fluid carrier in chemical analysis |
   Fulltext... Hierarchy... Expanded...G11B 15/46 | Filamentary or web record carriers or heads for such carriers in information storage systems |
   Fulltext... Hierarchy... Expanded...G11B 19/28 | Non-filamentary, non-web record carriers, or heads for such carriers in information storage systems |
   Places related to Fulltext... Hierarchy... Expanded...G05D 15/00
   Fulltext... Hierarchy... Expanded...B25D 9/26 | Portable percussive tools |
   Fulltext... Hierarchy... Expanded...B30B 15/22 | Ram pressure in presses |
   Fulltext... Hierarchy... Expanded...B65H 59/00 | Tension in filamentary material |
   Fulltext... Hierarchy... Expanded...B65H 77/00 | Tension in webs, tapes, filamentary material |
   Fulltext... Hierarchy... Expanded...B66D 1/50 | Rope, cable or chain tension |
   Fulltext... Hierarchy... Expanded...D03D 49/04 | Tension in looms |
   Fulltext... Hierarchy... Expanded...D05B 47/04 | Tension in sewing machines |
   Fulltext... Hierarchy... Expanded...D21F 3/06 | Pressure in paper-making machines |
   Fulltext... Hierarchy... Expanded...F26B 13/12 | Drying fabrics |
   Fulltext... Hierarchy... Expanded...F26B 21/10 | Pressure in dryers |
   Fulltext... Hierarchy... Expanded...G11B 15/43 | Record carrier tension in information storage arrangements |
   Places related to Fulltext... Hierarchy... Expanded...G05D 16/00
   Fulltext... Hierarchy... Expanded...B60C 23/00 | Tyre pressure |
   Fulltext... Hierarchy... Expanded...B63C 11/08 | Air within diving suit |
   Fulltext... Hierarchy... Expanded...B64D 13/00 | Aircraft air-pressure |
   Fulltext... Hierarchy... Expanded...B65G 53/66 | Bulk material conveyers |
   Fulltext... Hierarchy... Expanded...D01D 1/09 | Manufacture of artificial filaments, threads, fibres, bristles or ribbons |
   Fulltext... Hierarchy... Expanded...E21B 21/08 | Flushing boreholes |
   Fulltext... Hierarchy... Expanded...F01M 1/16 | Lubrication arrangements |
   Fulltext... Hierarchy... Expanded...G01N 30/32 | Pressure of fluid carrier in chemical analysis |
   Fulltext... Hierarchy... Expanded...H01J 7/14 | Pressure in electric discharge tubes or lamps |
   Fulltext... Hierarchy... Expanded...H01K 1/52 | Pressure in electric incandescent lamps |
   Places related to Fulltext... Hierarchy... Expanded...G05D 19/00
   Fulltext... Hierarchy... Expanded...B25D 9/26 | Portable percussion tools |
   Fulltext... Hierarchy... Expanded...B65G 27/32 | Jigging conveyers |
   Places related to Fulltext... Hierarchy... Expanded...G05D 21/00
   Fulltext... Hierarchy... Expanded...B01D 21/32 | Density in sedimentation arrangements |
   Fulltext... Hierarchy... Expanded...B01D 53/30 | Treating gases or vapours |
   Fulltext... Hierarchy... Expanded...G01N 30/34 | Composition of fluid carrier in chemical analysis |
   Places related to Fulltext... Hierarchy... Expanded...G05D 22/00
   Fulltext... Hierarchy... Expanded...A01G 25/16 | Watering gardens, fields, sports grounds or the like |
   Fulltext... Hierarchy... Expanded...A01K 41/04 | Poultry incubators |
   Fulltext... Hierarchy... Expanded...A24B 9/00 | Tobacco products |
   Fulltext... Hierarchy... Expanded...F24F 11/00 | Air conditioning |
   Fulltext... Hierarchy... Expanded...F26B 21/08 | Dryers |
   Places related to Fulltext... Hierarchy... Expanded...G05D 23/00
   Fulltext... Hierarchy... Expanded...A21B 1/40 | Bakers' ovens |
   Fulltext... Hierarchy... Expanded...A45D 6/20 | Hair curlers |
   Fulltext... Hierarchy... Expanded...B21C 31/00 | Metal extruding |
   Fulltext... Hierarchy... Expanded...B60C 23/00 | Tyre temperature |
   Fulltext... Hierarchy... Expanded...B64G 1/50 | Cosmonautic vehicles |
   Fulltext... Hierarchy... Expanded...C03B 18/18, Fulltext... Hierarchy... Expanded...C03B 18/22 | Float baths in glass making |
   Fulltext... Hierarchy... Expanded...D01D 1/09 | Manufacture of artificial filaments, threads, fibres, bristles or ribbons |
   Fulltext... Hierarchy... Expanded...D04B 35/30 | Knitting machines |
   Fulltext... Hierarchy... Expanded...D06F 75/26 | Hand irons |
   Fulltext... Hierarchy... Expanded...D21F 5/06 | Paper-making machines |
   Fulltext... Hierarchy... Expanded...F01M 5/00 | Lubricant in lubrication arrangements |
   Fulltext... Hierarchy... Expanded...F16N 7/08 | Arrangements for supplying oil or unspecified lubricant from a reservoir |
   Fulltext... Hierarchy... Expanded...F22G 5/00 | Steam superheat |
   Fulltext... Hierarchy... Expanded...F26B 21/10 | Dryers |
   Fulltext... Hierarchy... Expanded...G01N 30/30 | Temperature of fluid carrier in chemical analysis |
   Fulltext... Hierarchy... Expanded...H01M 10/50 | Electric storage cells |
   Fulltext... Hierarchy... Expanded...H05B 6/06, Fulltext... Hierarchy... Expanded...H05B 6/50, Fulltext... Hierarchy... Expanded...H05B 6/68 | Dielectric, induction or microwave heating |
   Fulltext... Hierarchy... Expanded...H05G 1/36 | Anode of X-ray tube |
   Places related to Fulltext... Hierarchy... Expanded...G05D 25/00
   Fulltext... Hierarchy... Expanded...B41B 21/08 | Photographic composing machines |
   Fulltext... Hierarchy... Expanded...H01S 3/10, Fulltext... Hierarchy... Expanded...H05B 33/08, Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H05B 35/00-H05B 43/00 | Lasers and other light sources |
   General references
   Fulltext... Hierarchy... Expanded...A01D 41/127 | Combines [7] |
   Fulltext... Hierarchy... Expanded...A01J 5/007 | Milking machines |
   Fulltext... Hierarchy... Expanded...B23K 9/095 | Welding parameters |
   Fulltext... Hierarchy... Expanded...B23Q 35/00 | Copying |
   Fulltext... Hierarchy... Expanded...B24B 17/00, Fulltext... Hierarchy... Expanded...B24B 49/00 | Grinding or polishing |
   Fulltext... Hierarchy... Expanded...B24C 7/00 | Abrasive blasts |
   Fulltext... Hierarchy... Expanded...B67D 1/12 | Dispensing beverages on draught |
   Fulltext... Hierarchy... Expanded...F23C 10/28 | Combustion apparatus in which combustion takes place in a fluidised bed of fuel or other particles [7] |
   Fulltext... Hierarchy... Expanded...G03G 21/20 | Electrographic, electrophotographic or magnetographic processes |
   Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H02P 5/00-H02P 9/00 | Dynamo-electric motors or generators |

|  | G05D |
Subclass index
CONTROL OF: SPEED OR ACCELERATION; FORCE; PRESSURE; POWER; MECHANICAL OSCILLATIONS | 13/00; 15/00; 16/00; 17/00; 19/00
CONTROL OF: FLOW; LEVEL; RATIO | 7/00; 9/00; 11/00
CONTROL OF: TEMPERATURE; HUMIDITY; VISCOSITY; CHEMICAL OR PHYSICO-CHEMICAL VARIABLES; LIGHT INTENSITY | 23/00; 22/00; 24/00; 21/00; 25/00
CONTROL OF: POSITION, DIRECTION, DIMENSIONS | 1/00 - 5/00
SIMULTANEOUS CONTROL OF TWO OR MORE VARIABLES | 27/00, 29/00
SUBJECT MATTER NOT PROVIDED FOR IN OTHER GROUPS OF THIS SUBCLASS | 99/00

P:30 |  | G05D 1/00 |
Control of position, course, altitude, or attitude of land, water, air, or space vehicles, e.g. automatic pilot (radio navigation systems or analogous systems using other waves Fulltext... Hierarchy... Expanded...G01S)

|  | G05D 1/02 |
· | Control of position or course in two dimensions [2]

|  | G05D 1/03 |
· · | using near-field transmission systems, e.g. inductive-loop type

|  | G05D 1/04 |
· | Control of altitude or depth

|  | G05D 1/06 |
· · | Rate of change of altitude or depth

|  | G05D 1/08 |
· | Control of attitude, i.e. control of roll, pitch, or yaw

|  | G05D 1/10 |
· | Simultaneous control of position or course in three dimensions (Fulltext... Hierarchy... Expanded...G05D 1/12 takes precedence)

|  | G05D 1/12 |
· | Target-seeking control

P:40 |  | G05D 3/00 |
Control of position or direction (Fulltext... Hierarchy... Expanded...G05D 1/00 takes precedence; for numerical control Fulltext... Hierarchy... Expanded...G05B 19/18)

|  | G05D 3/10 |
· | without using feedback [3]

|  | G05D 3/12 |
· | using feedback [3]

|  | G05D 3/14 |
· · | using an analogue comparing device [3]

|  | G05D 3/16 |
· · · | whose output amplitude can only take a number of discrete values (Fulltext... Hierarchy... Expanded...G05D 3/18 takes precedence) [3]

|  | G05D 3/18 |
· · · | delivering a series of pulses [3]

|  | G05D 3/20 |
· · | using a digital comparing device [3]

P:50 |  | G05D 5/00 |
Control of dimensions of material

|  | G05D 5/02 |
· | of thickness, e.g. of rolled material

|  | G05D 5/03 |
· · | characterised by the use of electric means

|  | G05D 5/04 |
· | of the size of items, e.g. of particles

|  | G05D 5/06 |
· · | characterised by the use of electric means

P:130 |  | G05D 7/00 |
Control of flow (level control Fulltext... Hierarchy... Expanded...G05D 9/00; ratio control Fulltext... Hierarchy... Expanded...G05D 11/00; weighing apparatus Fulltext... Hierarchy... Expanded...G01G)

|  | G05D 7/01 |
· | without auxiliary power

|  | G05D 7/03 |
· | with auxiliary non-electric power [2]

|  | G05D 7/06 |
· | characterised by the use of electric means

P:120 |  | G05D 9/00 |
Level control, e.g. controlling quantity of material stored in vessel

|  | G05D 9/02 |
· | without auxiliary power

|  | G05D 9/04 |
· | with auxiliary non-electric power [2]

|  | G05D 9/12 |
· | characterised by the use of electric means

P:60 |  | G05D 11/00 |
Ratio control (control of chemical or physico-chemical variables, e.g. pH-value, Fulltext... Hierarchy... Expanded...G05D 21/00; humidity control Fulltext... Hierarchy... Expanded...G05D 22/00; control of viscosity Fulltext... Hierarchy... Expanded...G05D 24/00) [3]

|  | G05D 11/02 |
· | Controlling ratio of two or more flows of fluid or fluent material

|  | G05D 11/03 |
· · | without auxiliary power

|  | G05D 11/035 |
· · | with auxiliary non-electric power [2]

|  | G05D 11/04 |
· · · | by sensing weight of individual components, e.g. gravimetric procedure

|  | G05D 11/06 |
· · · | by sensing density of mixture, e.g. using aerometer

|  | G05D 11/08 |
· · · | by sensing concentration of mixture, e.g. by measuring pH-value [3]

|  | G05D 11/10 |
· · · · | by sensing moisture of non-aqueous liquids

|  | G05D 11/12 |
· · · | by sensing viscosity of mixture

|  | G05D 11/13 |
· · | characterised by the use of electric means

|  | G05D 11/16 |
· | Controlling mixing ratio of fluids having different temperatures, e.g. by sensing the temperature of a mixture of fluids having different viscosities

P:150 |  | G05D 13/00 |
Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover (synchronising telegraph receiver and transmitter Fulltext... Hierarchy... Expanded...H04L 7/00)

|  | G05D 13/02 |
· | Details

|  | G05D 13/04 |
· · | providing for emergency tripping of an engine in case of exceeding maximum speed

|  | G05D 13/06 |
· · | providing for damping of erratic vibrations in governors

|  | G05D 13/08 |
· | without auxiliary power

|  | G05D 13/10 |
· · | Centrifugal governors with fly-weights

|  | G05D 13/12 |
· · · | Details

|  | G05D 13/14 |
· · · · | Fly-weights; Mountings thereof; Adjusting equipment for limits, e.g. temporarily

|  | G05D 13/16 |
· · · · | Risers; Transmission gear therefor; Restoring mechanisms therefor

|  | G05D 13/18 |
· · · | 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)

|  | G05D 13/32 |
· · · | using a pump

|  | G05D 13/34 |
· | with auxiliary non-electric power (fluid-pressure converters Fulltext... Hierarchy... Expanded...F15B 3/00) [2]

|  | G05D 13/36 |
· · | 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 centrifugal 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

P:170 |  | G05D 15/00 |
Control of mechanical force or stress; Control of mechanical pressure

|  | G05D 15/01 |
· | characterised by the use of electric means

P:110 |  | G05D 16/00 |
Control of fluid pressure

|  | G05D 16/02 |
· | 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

|  | G05D 16/08 |
· · · | Control of liquid pressure

|  | G05D 16/10 |
· · | the sensing element being a piston or plunger

|  | G05D 16/12 |
· · | the sensing element being a float

|  | G05D 16/14 |
· | with auxiliary non-electric power [2]

|  | G05D 16/16 |
· · | derived from the controlled fluid

|  | G05D 16/18 |
· · | derived from an external source

|  | G05D 16/20 |
· | characterised by the use of electric means

P:160 |  | G05D 17/00 |
Control of torque; Control of mechanical power

|  | G05D 17/02 |
· | characterised by the use of electric means

P:140 |  | G05D 19/00 |
Control of mechanical oscillations, e.g. of amplitude, of frequency, of phase

|  | G05D 19/02 |
· | characterised by the use of electric means

P:80 |  | G05D 21/00 |
Control of chemical or physico-chemical variables, e.g. pH-value [3]

|  | G05D 21/02 |
· | characterised by the use of electric means

P:90 |  | G05D 22/00 |
Control of humidity [2]

|  | G05D 22/02 |
· | characterised by the use of electric means

P:100 |  | G05D 23/00 |
Control of temperature (automatic switching arrangements for electric heating apparatus Fulltext... Hierarchy... Expanded...H05B 1/02)

|  | G05D 23/01 |
· | without auxiliary power

|  | G05D 23/02 |
· · | with sensing element expanding and contracting in response to changes of temperature (Fulltext... Hierarchy... Expanded...G05D 23/13 takes precedence)

|  | G05D 23/08 |
· · · | with bimetallic element (arrangement of valves and flow lines specially adapted for mixing fluid Fulltext... Hierarchy... Expanded...F16K 11/00)

|  | G05D 23/10 |
· · · · | with snap-action elements (for valves Fulltext... Hierarchy... Expanded...F16K 31/56)

|  | G05D 23/12 |
· · | with sensing element responsive to pressure or volume changes in a confined fluid

|  | G05D 23/13 |
· · | by varying the mixing ratio of two fluids having different temperatures

|  | G05D 23/185 |
· | with auxiliary non-electric power [2]

|  | G05D 23/19 |
· | characterised by the use of electric means

|  | G05D 23/20 |
· · | with sensing elements having variation of electric or magnetic properties with change of temperature (Fulltext... Hierarchy... Expanded...G05D 23/13 takes precedence)

|  | G05D 23/22 |
· · · | the sensing element being a thermocouple

|  | G05D 23/24 |
· · · | 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

P:70 |  | G05D 24/00 |
Control of viscosity

|  | G05D 24/02 |
· | characterised by the use of electric means

P:20 |  | G05D 25/00 |
Control of light, e.g. intensity, colour, phase (mechanically operable parts of lighting devices for the control of light Fulltext... Hierarchy... Expanded...F21V; optical devices or arrangements using movable or deformable elements for controlling light independent of the light source Fulltext... Hierarchy... Expanded...G02B 26/00; devices or arrangements, the optical operation of which is modified by changing the optical properties of the medium of the devices or arrangements for the control of light, circuit arrangements specially adapted therefor, control of light by electro-magnetic waves, electrons or other elementary particles Fulltext... Hierarchy... Expanded...G02F 1/00) [4]

|  | G05D 25/02 |
· | characterised by the use of electric means

P:10 |  | G05D 27/00 |
Simultaneous control of variables covered by two or more of main groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...G05D 1/00-G05D 25/00

|  | G05D 27/02 |
· | characterised by the use of electric means

P:0 |  | G05D 29/00 |
Simultaneous control of electric and non-electric variables

P:180 |  | G05D 99/00 |
Subject matter not provided for in other groups of this subclass [8]