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Proportional control

Index Proportional control

Proportional control, in engineering and process control, is a type of linear feedback control system in which a correction is applied to the controlled variable which is proportional to the difference between the desired value (set point, SP) and the measured value (process value, PV). [1]

15 relations: Ballcock, Bang–bang control, Centrifugal governor, Control system, Control valve, Cruise control, Duty cycle, Feedback, Hooke's law, Hysteresis, PID controller, Power-to-weight ratio, Process variable, Setpoint (control system), Thermostat.


A ballcock (also balltap or float valve) is a mechanism or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow and (in the event of low water pressure) backflow.

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Bang–bang control

In control theory, a bang–bang controller (2 step or on–off controller), also known as a hysteresis controller, is a feedback controller that switches abruptly between two states.

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Centrifugal governor

A centrifugal governor is a specific type of governor with a feedback system that controls the speed of an engine by regulating the amount of fuel (or working fluid) admitted, so as to maintain a near-constant speed, irrespective of the load or fuel-supply conditions.

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Control system

A control system manages, commands, directs, or regulates the behavior of other devices or systems using control loops.

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Control valve

A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller.

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Cruise control

Cruise control (sometimes known as speed control or autocruise, or tempomat in some countries) is a system that automatically controls the speed of a motor vehicle.

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Duty cycle

A duty cycle is the fraction of one period in which a signal or system is active.

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Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop.

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Hooke's law

Hooke's law is a principle of physics that states that the force needed to extend or compress a spring by some distance scales linearly with respect to that distance.

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Hysteresis is the dependence of the state of a system on its history.

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PID controller

A proportional–integral–derivative controller (PID controller or three term controller) is a control loop feedback mechanism widely used in industrial control systems and a variety of other applications requiring continuously modulated control.

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Power-to-weight ratio

Power-to-weight ratio (or specific power or power-to-mass ratio) is a calculation commonly applied to engines and mobile power sources to enable the comparison of one unit or design to another.

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Process variable

A process variable, process value or process parameter is the current measured value of a particular part of a process which is being monitored or controlled.

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Setpoint (control system)

In cybernetics and control theory, a setpoint (also set point, set-point) is the desired or target value for an essential variable, or process value of a system.

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A thermostat is a component which senses the temperature of a physical system and performs actions so that the system's temperature is maintained near a desired setpoint.

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P controller, Proportional Control, Proportional controller.


[1] https://en.wikipedia.org/wiki/Proportional_control

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