SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES

Introduced: September 1968

Description

G05D covers automatic control and regulation systems for physical variables that are not primarily electrical in nature, such as temperature, pressure, flow rate, liquid level, speed, and mechanical position. These systems employ various sensing, feedback, and actuating mechanisms—including mechanical, hydraulic, pneumatic, and thermal devices—to maintain desired setpoints or respond to process changes. The class encompasses both continuous regulation systems and systems with discrete control logic implemented through non-electrical means. G05D excludes control systems where the controlled variable is inherently electrical (covered by G05B) and excludes the control systems' electrical or electronic components when classified separately.

Of 31 combined children, 19 exist in both systems.

6 codes are CPC-only extensions, 6 exist only in IPC.

Note: 6 CPC extensions are marked as secondary classification only.

7 shared codes have differing titles between IPC and CPC.

Child Classifications

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G05D 1/00 Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots (drive control systems specially adapted for autonomous road vehicles B60W60/00) +11 CPC IPC+CPC Available in IPC and CPC
G05D 101/00 Details of software or hardware architectures used for the control of position since 2024 −2 IPC IPC only IPC only
G05D 103/00 Adaptations for complying with regulatory restraints on the operations of the controlled vehicles, e.g. compliance with airspace or traffic regulations since 2024 IPC only IPC only
G05D 105/00 Specific applications of the controlled vehicles since 2024 −14 IPC IPC only IPC only
G05D 107/00 Specific environments of the controlled vehicles since 2024 −9 IPC IPC only IPC only
G05D 109/00 Types of controlled vehicles since 2024 −5 IPC IPC only IPC only
G05D 11/00 Control of flow ratio (control of chemical or physico-chemical variables, e.g. pH-value, G05D21/00; control of humidity G05D22/00; control of temperature by varying the mixing ratio of two fluids having different temperatures G05D23/13; control of viscosity G05D24/00) +5 CPC IPC+CPC Available in IPC and CPC
G05D 111/00 Details of signals used for control of position, course, altitude or attitude of land, water, air or space vehicles since 2024 −6 IPC IPC only IPC only
G05D 13/00 Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover IPC+CPC Available in IPC and CPC
G05D 15/00 Control of mechanical force or stress; Control of mechanical pressure IPC+CPC Available in IPC and CPC
G05D 16/00 Control of fluid pressure +2 CPC IPC+CPC Available in IPC and CPC
G05D 17/00 Control of torque; Control of mechanical power IPC+CPC Available in IPC and CPC
G05D 19/00 Control of mechanical oscillations, e.g. of amplitude, of frequency, of phase IPC+CPC Available in IPC and CPC
G05D 21/00 Control of chemical or physico-chemical variables, e.g. pH value IPC+CPC Available in IPC and CPC
G05D 2101/00 Details of software or hardware architectures used for the control of position 2nd only +5 CPC CPC only CPC only
G05D 2103/00 Adaptations for complying with regulatory restraints on the operations of the controlled vehicles, e.g. compliance with airspace or traffic regulations 2nd only CPC only CPC only
G05D 2105/00 Specific applications of the controlled vehicles 2nd only +18 CPC CPC only CPC only
G05D 2107/00 Specific environments of the controlled vehicles 2nd only +14 CPC CPC only CPC only
G05D 2109/00 Types of controlled vehicles 2nd only +5 CPC CPC only CPC only
G05D 2111/00 Details of signals used for control of position, course, altitude or attitude of land, water, air or space vehicles 2nd only +6 CPC CPC only CPC only