Faster access than browser!

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]

Ballcock

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.

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.

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.

Control system

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

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.

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.

Duty cycle

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

Feedback

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.

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.

Hysteresis

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

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.

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.

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.

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.

Thermostat

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.

References

Hey! We are on Facebook now! »