This document provides an overview of open loop and closed loop control systems. It discusses that open loop systems do not have feedback, making them simple and inexpensive but unreliable and inaccurate. Closed loop systems use feedback to evaluate inputs and outputs, making them more complex but also reliable and accurate. The key difference between the two is that open loop control is independent of output while closed loop control depends on output. Closed loop systems allow for optimization and better handling of disruptions compared to open loop systems.
1. GREATER KOLKATA COLLEGE OF ENGINEERING AND MANAGEMENT
Dept of Electronics and Communication Engineering
Subject: Control System and Instrumentation ( EC 601 )
Topic- Open Loop vs Closed Loop control system
Name – Sumanta Dey
University roll : 23600320003
B. Tech , 3rd year
2. INTRODUCTION
The behavior of the system can be determined with the help of a
differential equation is known as the control system. So it controls
different devices as well as systems with the help of control loops.
Control systems are classified into two types like open loop and
closed loop. This presentation discusses an overview of the
difference between open-loop and closed-loop control systems.
3. WHAT IS AN OPEN LOOP CONTROL SYSTEM?
In this kind of control system, the output doesn’t change the action of the control
system otherwise; the working of the system which depends on time is also called the
open-loop control system. It doesn’t have any feedback. It is very simple, needs low
maintenance, quick operation, and cost-effective. The accuracy of this system is low and
less dependable.
4. WHAT IS A CLOSED-LOOP CONTROL SYSTEM?
The closed-loop control system can be defined as the output of the system that
depends on the input of the system. This control system has one or more feedback
loops among its input & output. This system provides the required output by evaluating
its input. This kind of system produces the error signal and it is the main disparity
between the output and input of the system.
5. DIFFERENCE BETWEEN OPEN LOOP AND CLOSED LOOP
CONTROL SYSTEM
The main difference between open-loop and closed-loop control system
mainly includes its definition, components, construction, reliability,
accuracy, stability, optimization, response, calibration, linearity,
disturbance of the system.
Open Loop Control System Closed Loop Control System
Control action is independent of
output.
Control action is dependent of output.
Sensibility is high. Sensibility is very less.
Optimization is not possible. Optimization is possible.
These are unreliable and inaccurate
system.
These are reliable and accurate
system.
Number of components are less , so
they are simple and cheap.
Number of components are more so
they are complex
6. OPEN LOOP CONTROL: ADVANTAGES AND
DISADVANTAGES
The main advantages of an open loop production control system are:
a) Simplicity
b) Low-cost
c) Easy maintenance
d) No measurement
Disadvantages of an open loop control system are
The main disadvantages of an open loop production control system are:
a) Can’t handle disruptions
b) Poor reliability
c) Poor flexibility
d) Poor accuracy
7. CLOSED LOOP CONTROL: ADVANTAGES AND
DISADVANTAGES
Advantages of a closed loop control system
a) Reliable and accurate
b) Flexible and faster recovery
c) Continuous improvement
Disadvantages of a closed loop control system
a) Required heavy documentation or spreadsheets management software
solutions were expensive and exclusive required costly and intensive
training for employees
