Introduction to Process Control
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30 Terms
Control system
It is a system that provides the desired response by controlling the output.
True
TRUE OR FALSE. In a control system, the output is controlled by varying input.
To maintain a process at a desired, constant operating condition (temperature, pressure, composition, etc.) in the face of disturbances
To force it to follow a desired trajectory with time
Enumerate the two (2) objectives of process control.
Encounter a process.
Learn how it behaves.
Specify how you wish to control it.
Choose an appropriate equipment.
Check if applying control has improved things.
Enumerate the five (5) general steps of process control.
FAMILIARIZE.
FAMILIARIZE.
Error = [Set point value] - [Measurement signal of controlled variable]
What is the formula for error?
Measurement (often several)
Control strategy (embedded in a controller)
Final element (for implementing the control action)
Enumerate the three (3) elements of process control.
Measurements (measuring devices or sensors)
ELEMENTS OF PROCESS CONTROL. Determine what is being asked below.
The most common of these devices are for flow rate, pressure, liquid level, temperature, pH, and other selective measures of chemical composition.
Classical proportional-integral-derivative (PID) controllers
ELEMENTS OF PROCESS CONTROL. Determine what is being asked below.
These still dominate feedback strategy in industrial applications.
Final control element
ELEMENTS OF PROCESS CONTROL. Determine what is being asked below.
The control action signal calculated by the controller is sent to the ___.
Final control element
ELEMENTS OF PROCESS CONTROL. Determine what is being asked below.
It is a device which implements the change of a suitable input to the system.
Controlled variable
PROCESS VARIABLES. Determine what is being asked below.
It is the process variable that we want to maintain at a particular value.
Set point
PROCESS VARIABLES. Determine what is being asked below.
It is the desired value of the controlled variable.
Disturbances
PROCESS VARIABLES. Determine what is being asked below.
These are any process variables that can cause the controlled variable to change.
Disturbances
PROCESS VARIABLES. Determine what is being asked below.
These are variables that we have no control over.
Manipulated variable
PROCESS VARIABLES. Determine what is being asked below.
It is a process variable that is adjusted to bring the controlled variable back to the set point.
Disturbance rejection
COMMON ATTRIBUTES OF CONTROL SYSTEMS. Determine what is being asked.
It is the ability to maintain the process variable at its desired value in spite of disturbances that might be experienced.
Set point tracking
COMMON ATTRIBUTES OF CONTROL SYSTEMS. Determine what is being asked.
It is the ability to move the process variable from one setting to a new desired setting.
FAMILIARIZE.
FAMILIARIZE.
Continuous time vs discrete time control systems
SISO vs MIMO control systems
Open loop vs closed loop control systems
Feedback vs Feedforward control systems
Enumerate the four (4) classifications of control systems.
Continuous and discrete time control systems
CLASSIFICATIONS OF CONTROL SYSTEMS. Determine what is being asked below.
Control systems can be classified as these control systems based on the type of the signal used.
Continuous time control systems
CLASSIFICATIONS OF CONTROL SYSTEMS. Determine what is being asked below.
In this type of control system, all the signals are continuous in time.
Discrete time control systems
CLASSIFICATIONS OF CONTROL SYSTEMS. Determine what is being asked below.
In this type of control system, one or more discrete time signals.
CLASSIFICATIONS OF CONTROL SYSTEMS. Determine what is being asked below.