G
SECTION G — PHYSICS
  
INSTRUMENTS
 G05
CONTROLLING; REGULATING (specially adapted to a particular field of use, see the relevant sub-class, e.g. B23Q)
 G05

Note(s)

  1. Attention is drawn to the notes (particularly the definition of the term "variable") on page 7 of this Section.
  2. This class covers methods, systems, and apparatus for controlling in general.
  3. In this class, the following terms are used with the meanings indicated:
    1. "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.
    2. "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".
 G05D
SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES (for continuous casting of metals B22D 11/16; valves per se F16K; sensing non-electric variables, see the relevant sub-classes of G01; for regulating electric or magnetic variables G05F)
 G05D

Note(s)

  1. The term "systems" in this sub-class includes self-contained devices such as speed governors, pressure regulators.
  2. Features of general applicability to regulating systems, e.g. anti-hunting arrangements, are classified in sub-class G05B.
  3. Control systems designed specifically for particular apparatus, machines, or processes are classified in the sub-classes for the apparatus, machines, or processes, provided that (a) there is specific provision there for the control aspect and (b) the apparatus, machines, or processes are described in detail.
 G05D 1/00
Control of position, course, altitude, or attitude of land, water, air, or space vehicles, e.g. automatic pilot (construction or disposition of steering means on land vehicles B62, on waterborne vessels B63; manual or automatic control of aircraft, e.g. using automatic pilot or radiated signals, B64C; radio navigation systems or analogous systems using other waves 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 (G05D 1/12 takes precedence)
 G05D 1/12
·  Target-seeking control
 G05D 3/00
Control of position or direction (G05D 1/00 takes precedence; control of feed movement or position of tool or work on machine tools B23Q 15/00; automatic control in web-advancing mechanisms B65H; servomotors with follow-up action F15B 9/00; for numerical control G05B 19/18)
 G05D 3/02 - 
G05D 3/08
( transferred to G05D 3/10-G05D 3/20 )
 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 (G05D 3/18 takes precedence)  [3]
 G05D 3/18
·  ·  ·  delivering a series of pulses  [3]
 G05D 3/20
·  ·  using a digital comparing device  [3]
 G05D 5/00
Control of dimensions of material
 G05D 5/02
·  of thickness, e.g. of rolled material (of specific materials B21B, B29C, B32B, C03B, D21F)
 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
 G05D 7/00
Control of flow (level control G05D 9/00; ratio control G05D 11/00; weighing apparatus 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
 G05D 9/00
Level control, e.g. controlling quantity of material stored in vessel (controlling level of liquid-pool electrode in electric discharge tubes and lamps H01J 1/10, H01J 13/14)
 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
 G05D 11/00
Ratio control (control of chemical or physico-chemical variables, e.g. pH-value, G05D 21/00; humidity control G05D 22/00; control of viscosity G05D 24/00)
 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
 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
 G05D 13/00
Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover (of dynamo-electric machines H02P; synchronising telegraph receiver and transmitter H04L 7/00, H04N 1/36)
 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 F15B 5/00)
 G05D 13/32
·  ·  ·  using a pump
 G05D 13/34
·  with auxiliary non-electric power (fluid-pressure converters 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
 G05D 15/00
Control of mechanical force or stress; Control of mechanical pressure
 G05D 15/01
·  characterised by the use of electric means
 G05D 16/00
Control of fluid pressure (control of pressure in electric discharge tubes or lamps H01J, e.g. H01J 7/14; control of pressure in electric incandescent lamps H01K 1/52)
 G05D 16/02
·  Modifications to reduce the effects of instability, e.g. due to vibrations, friction, abnormal temperature, overloading, unbalance (vibration-dampers 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
 G05D 17/00
Control of torque; Control of mechanical power
 G05D 17/02
·  characterised by the use of electric means
 G05D 19/00
Control of mechanical oscillations, e.g. of amplitude, of frequency, of phase (generating or transmitting mechanical vibrations B06B; control of electric motors H02P)
 G05D 19/02
·  characterised by the use of electric means
 G05D 21/00
Control of chemical or physico-chemical variables, e.g. pH-value
 G05D 21/02
·  characterised by the use of electric means
 G05D 22/00
Control of humidity (of tobacco products A24B 9/00; air conditioning F24F)  [2]
 G05D 22/02
·  characterised by the use of electric means
 G05D 23/00
Control of temperature (automatic switching arrangements for electric heating apparatus H05B 1/02; controlling dielectric, induction, or microwave heating H05B 6/06, H05B 6/50, H05B 6/68; regulating temperature of anode of X-ray tube H05G 1/36)
 G05D 23/01
·  without auxiliary power
 G05D 23/02
·  ·  with sensing element expanding and contracting in response to changes of temperature (G05D 23/13 takes precedence)
 G05D 23/08
·  ·  ·  with bimetallic element (valve arrangements adapted for mixing F16K 19/00)
 G05D 23/10
·  ·  ·  ·  with snap-action elements (for valves 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 (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 G05B)
 G05D 23/32
·  ·  ·  with provision for adjustment of the effect of the auxiliary heating device, e.g. as a function of time
 G05D 24/00
Control of viscosity
 G05D 24/02
·  characterised by the use of electric means
 G05D 25/00
Control of light intensity (control of light by electro-, magneto-, or acousto-optical devices or control of light by electromagnetic waves or by electrons or other elementary particles G02F 1/00; circuit arrangements for controlling light sources H01S 3/10, H05B 33/08, H05B 35/00-H05B 43/00)
 G05D 25/02
·  characterised by the use of electric means
 G05D 27/00
Simultaneous control of variables covered by two or more of the preceding main groups
 G05D 27/02
·  characterised by the use of electric means
 G05D 29/00
Simultaneous control of electric and non-electric variables