Regarding PID control, MV output.
Thread Content
Is the deviation signal e the difference between the PV value and the SV value? According to this formula, when PV-SV=0, the control valve is either fully open or fully closed. In practical applications, MV still has an output.
This post was last edited by ylb913 on 2015-12-31 23:31. When the deviation is zero, the valve position remains unchanged. This e should be the sum of the deviation DV between PV and SV, the integral of DV, and the rate of change of DV (derivative).
Only a PID with a deviation will generate an output, causing the valve to move; without a deviation, there is no output and the valve remains unchanged.
In the formula, u represents the change amount, that is, the change in output plus the original output. The original output is the output when the controller is operated manually. When the deviation is zero, the change in the controller’s output is zero, and the controller’s output equals the original output.
Great! ! ! What does this Tout mean?
When there is no deviation, the regulator output remains unchanged, and an output will definitely be present.