Difference between Feedback and Feed Forward control systems

1. Feedback Control System : Feedback control system is basically a control system where the output depends on the generated feedback signal. Feedback control system is responsible for processing the feedback signals which further act as an input to the system. Feedback control system consist of different components such as resistors, transistors and other electrical appliances which do the basic functioning. The feedback can further be divided into positive feedback and negative feedback. 

2. Feed forward Control System : Feed forward control system is a system which passes the signal to some external load. It rejects the disturbances before they affect the controlled variable. It controls the major disturbances and is many times used with the combination of a feedback system. Feed forward systems are sensitive to modelling errors. It does direct measurement of the disturbances in the system. 

Feedback and feedforward control systems are two different types of control systems used in organizations to monitor and manage processes.

Feedback control systems are designed to monitor the output of a process and compare it to a desired output. The difference between the actual output and the desired output, called the error signal, is used to adjust the process inputs to bring the output back to the desired value. In other words, feedback control systems use information about the past performance of a process to adjust its future performance. Examples of feedback control systems include thermostats that control the temperature in a room, and cruise control systems in cars that maintain a constant speed.

Feedforward control systems, on the other hand, are designed to anticipate and prevent problems before they occur. Feedforward control systems use information about the expected performance of a process to adjust its inputs before any problems occur. In other words, feedforward control systems use information about future conditions to adjust current inputs. Examples of feedforward control systems include predictive maintenance systems that monitor equipment performance and schedule maintenance before a breakdown occurs, and forecasting systems that predict demand for products to ensure that inventory levels are adequate.

Some key differences between feedback and feedforward control systems include:

1. Timing: Feedback control systems adjust the process inputs based on past performance, while feedforward control systems adjust the process inputs based on expected future performance.
2. Use of information: Feedback control systems use information about the error signal to adjust the process inputs, while feedforward control systems use information about expected conditions to adjust the process inputs.
3. Response time: Feedback control systems may have a longer response time as they wait for the error signal to occur before making adjustments, while feedforward control systems may have a shorter response time as they anticipate problems and adjust inputs before they occur.

In summary, while feedback control systems adjust process inputs based on past performance, feedforward control systems adjust inputs base

Difference between Feedback and Feed Forward Control Systems :

S.NO.	Feedback Control System	Feed Forward Control System
1.	In feedback system output depends on the generated feedback signal.	In feed forward system the signal is passed to some external load.
2.	Measure of disturbances in the system is not needed by feedback system.	Measure of disturbances in the system is needed by feed forward system.
3.	All the disturbances are detected in feedback system.	All the disturbances are not detected in feed forward system.
4.	The loop in a feedback control system is a closed loop.	The loop in a feed forward control system is an open loop.
5.	It focuses on the output of the system.	It focuses on the input of the system.
6.	The variables are adjusted on the basis of errors.	The variables are adjusted on the basis of knowledge.