Hello folks,
I need help understanding what "feed forward" control algorithm really is. I must confess that I'm failed to acquire a good understanding of this type of control algorithm. I have a reasonably good understanding closed loop control i.e. feedback control strategy. Basically, story is always the same: some kind of transmitter measure process variable (PV), then, deviation from the setpoint is calculated (SP-PV) and feed to controller (for instance PID) which produce control output that drive actuator. These scheme can be easily pictured and we all see it countless times. On the other hand, I'm not quite sure if I can draw feed forward control scheme. I now the basics and I've read some articles about it (http://www.controlguru.com/wp/p41.html). In this particular example, some kind of signal that causes disturbance is "feed forwarded" to controller to produce output not waiting too long to sense temperature's deviation with the thermocouple.
How that kind of controller can be implemented?
"The computed change was fed to the controller and combined with the traditional feedback signal." I'm interesting to see how that signal is "combined".
I've also read that feed forward control algorithm combines disturbance with traditional feedback signal and produce CO, but I'm really interested to see on some particular example how?
Can you help me clarify these things?
I hope Peter will jump in with his valuable suggestions.
Looking forward to read your comments.
I need help understanding what "feed forward" control algorithm really is. I must confess that I'm failed to acquire a good understanding of this type of control algorithm. I have a reasonably good understanding closed loop control i.e. feedback control strategy. Basically, story is always the same: some kind of transmitter measure process variable (PV), then, deviation from the setpoint is calculated (SP-PV) and feed to controller (for instance PID) which produce control output that drive actuator. These scheme can be easily pictured and we all see it countless times. On the other hand, I'm not quite sure if I can draw feed forward control scheme. I now the basics and I've read some articles about it (http://www.controlguru.com/wp/p41.html). In this particular example, some kind of signal that causes disturbance is "feed forwarded" to controller to produce output not waiting too long to sense temperature's deviation with the thermocouple.
How that kind of controller can be implemented?
"The computed change was fed to the controller and combined with the traditional feedback signal." I'm interesting to see how that signal is "combined".
I've also read that feed forward control algorithm combines disturbance with traditional feedback signal and produce CO, but I'm really interested to see on some particular example how?
Can you help me clarify these things?
I hope Peter will jump in with his valuable suggestions.
Looking forward to read your comments.