IPC Classification

Class code (prefix) Descriptions Number of results
G05D 1/00 Control of position, course, altitude, or attitude of land, water, air, or space vehicles, e.g. automatic pilot
G05D 1/02 Control of position or course in two dimensions
G05D 1/03 Control of position or course in two dimensions 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 Target-seeking control
G05D 3/00 Control of position or direction
G05D 3/10 Control of position or direction without using feedback
G05D 3/12 Control of position or direction using feedback
G05D 3/14 Control of position or direction using feedback using an analogue comparing device
G05D 3/16 Control of position or direction using feedback using an analogue comparing device whose output amplitude can only take a number of discrete values
G05D 3/18 Control of position or direction using feedback using an analogue comparing device delivering a series of pulses
G05D 3/20 Control of position or direction using feedback using a digital comparing device
G05D 5/00 Control of dimensions of material
G05D 5/02 Control of dimensions of material of thickness, e.g. of rolled material
G05D 5/03 Control of dimensions of material of thickness, e.g. of rolled material characterised by the use of electric means
G05D 5/04 Control of dimensions of material of the size of items, e.g. of particles
G05D 5/06 Control of dimensions of material of the size of items, e.g. of particles characterised by the use of electric means
G05D 7/00 Control of flow
G05D 7/01 Control of flow without auxiliary power
G05D 7/03 Control of flow with auxiliary non-electric power
G05D 7/06 Control of flow characterised by the use of electric means
G05D 9/00 Level control, e.g. controlling quantity of material stored in vessel
G05D 9/02 Level control, e.g. controlling quantity of material stored in vessel without auxiliary power
G05D 9/04 Level control, e.g. controlling quantity of material stored in vessel with auxiliary non-electric power
G05D 9/12 Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
G05D 11/00 Control of flow ratio
G05D 11/02 Controlling ratio of two or more flows of fluid or fluent material
G05D 11/03 Controlling ratio of two or more flows of fluid or fluent material without auxiliary power
G05D 11/04 Controlling ratio of two or more flows of fluid or fluent material with auxiliary non-electric power by sensing weight of individual components, e.g. gravimetric procedure
G05D 11/06 Controlling ratio of two or more flows of fluid or fluent material with auxiliary non-electric power by sensing density of mixture, e.g. using aerometer
G05D 11/08 Controlling ratio of two or more flows of fluid or fluent material with auxiliary non-electric power by sensing concentration of mixture, e.g. by measuring pH-value
G05D 11/10 Controlling ratio of two or more flows of fluid or fluent material with auxiliary non-electric power by sensing concentration of mixture, e.g. by measuring pH-value by sensing moisture of non-aqueous liquids
G05D 11/12 Controlling ratio of two or more flows of fluid or fluent material with auxiliary non-electric power by sensing viscosity of mixture
G05D 11/13 Controlling ratio of two or more flows of fluid or fluent material 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 11/035 Controlling ratio of two or more flows of fluid or fluent material with auxiliary non-electric power
G05D 13/00 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover
G05D 13/02 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover - Details
G05D 13/04 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover - Details providing for emergency tripping of an engine in case of exceeding maximum speed
G05D 13/06 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover - Details providing for damping of erratic vibrations in governors
G05D 13/08 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover without auxiliary power
G05D 13/10 Centrifugal governors with fly-weights
G05D 13/12 Centrifugal governors with fly-weights - 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 Centrifugal governors with fly-weights counterbalanced by spider springs acting immediately upon the fly-weights
G05D 13/20 Centrifugal governors with fly-weights counterbalanced by spider springs acting upon the articulated riser
G05D 13/22 Centrifugal governors with fly-weights counterbalanced by fluid pressure acting upon the articulated riser
G05D 13/24 Centrifugal governors with fly-weights counterbalanced by two or more different appliances acting simultaneously upon the riser, e.g. with both spring force and fluid pressure or with both spring force and electromagnetic force
G05D 13/26 Centrifugal governors with fly-weights with provision for modulating the degree of non-uniformity of speed
G05D 13/28 Centrifugal governors with fly-weights 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
G05D 13/32 Governors characterised by fluid features in which the speed of a shaft is converted into fluid pressure using a pump
G05D 13/34 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power
G05D 13/36 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band, i.e. P. regulating devices
G05D 13/38 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band, i.e. P. regulating devices involving centrifugal governors of fly-weight type
G05D 13/40 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band, i.e. P. regulating devices involving centrifugal governors of pump type
G05D 13/42 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band, i.e. P. regulating devices involving fluid governors of flow-controller type, i.e. the width of liquid flow being controlled by fly-weights
G05D 13/44 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band, i.e. P. regulating devices involving fluid governors of jet type
G05D 13/46 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band and integral action, i.e. P.I. regulating devices
G05D 13/48 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band and integral action, i.e. P.I. regulating devices involving resilient restoring mechanisms
G05D 13/50 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band and integral action, i.e. P.I. regulating devices involving connecting means for superimposing a proportional regulating device and an integral regulating device
G05D 13/52 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band and derivative action, i.e. P.D. regulating devices
G05D 13/54 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band and derivative action, i.e. P.D. regulating devices involving centrifugal governors of fly-weight type exerting an acceleratory effect
G05D 13/56 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band and derivative action, i.e. P.D. regulating devices involving restoring mechanisms exerting a delay effect
G05D 13/58 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band and derivative action, i.e. P.D. regulating devices involving means for connecting a speed- regulating device and an acceleration- regulating device
G05D 13/60 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band, derivative, and integral action, i.e. P.I.D. regulating devices
G05D 13/62 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover 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 Control of mechanical force or stress; Control of mechanical pressure characterised by the use of electric means
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 or unbalance
G05D 16/04 Control of fluid pressure without auxiliary power
G05D 16/06 Control of fluid pressure without auxiliary power 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 Control of fluid pressure without auxiliary power the sensing element being a piston or plunger
G05D 16/12 Control of fluid pressure without auxiliary power the sensing element being a float
G05D 16/14 Control of fluid pressure with auxiliary non-electric power
G05D 16/16 Control of fluid pressure with auxiliary non-electric power derived from the controlled fluid
G05D 16/18 Control of fluid pressure with auxiliary non-electric power derived from an external source
G05D 16/20 Control of fluid pressure characterised by the use of electric means
G05D 17/00 Control of torque; Control of mechanical power
G05D 17/02 Control of torque; Control of mechanical power characterised by the use of electric means
G05D 19/00 Control of mechanical oscillations, e.g. of amplitude, of frequency, of phase
G05D 19/02 Control of mechanical oscillations, e.g. of amplitude, of frequency, of phase characterised by the use of electric means
G05D 21/00 Control of chemical or physico-chemical variables, e.g. pH-value
G05D 21/02 Control of chemical or physico-chemical variables, e.g. pH-value characterised by the use of electric means
G05D 22/00 Control of humidity
G05D 22/02 Control of humidity characterised by the use of electric means
G05D 23/00 Control of temperature
G05D 23/01 Control of temperature without auxiliary power
G05D 23/02 Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature
G05D 23/08 Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature with bimetallic element
G05D 23/10 Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature with bimetallic element with snap-action elements
G05D 23/12 Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid
G05D 23/13 Control of temperature without auxiliary power by varying the mixing ratio of two fluids having different temperatures
G05D 23/19 Control of temperature characterised by the use of electric means
G05D 23/20 Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
G05D 23/22 Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
G05D 23/24 Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. thermistor
G05D 23/26 Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a permeability varying with temperature
G05D 23/27 Control of temperature characterised by the use of electric means with sensing element responsive to radiation
G05D 23/30 Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
G05D 23/32 Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature with provision for adjustment of the effect of the auxiliary heating device, e.g. as a function of time
G05D 23/185 Control of temperature with auxiliary non-electric power
G05D 23/275 Control of temperature characterised by the use of electric means with sensing element expanding, contracting, or fusing in response to changes of temperature
G05D 24/00 Control of viscosity
G05D 24/02 Control of viscosity characterised by the use of electric means
G05D 25/00 Control of light, e.g. intensity, colour or phase
G05D 25/02 Control of light, e.g. intensity, colour or phase characterised by the use of electric means
G05D 27/00 Simultaneous control of variables covered by two or more of main groups
G05D 27/02 Simultaneous control of variables covered by two or more of main groups characterised by the use of electric means
G05D 29/00 Simultaneous control of electric and non-electric variables
G05D 99/00 Subject matter not provided for in other groups of this subclass