controlnovice
Electrical
Well for DeltaV anyway. I asked this question earlier, and finally found a good clean answer.
DeltaV's Fuzzy Logic Controller (FLC) has three tuning parameters. I'm not sure about other manufacturers. They are:
% Error
% Change in Error
% Output
% Error: Very similar to P in PID. It looks at the error between setpoint and actual value. The parameter is in % of full scale of your process value.
% Change in error: How fast the process is approaching setpoint. This is also in % of full scale of your process value.
% Output: When the process value differs more than the "% Error" and the process value is heading in the 'wrong' direction (away from setpoint) by more than the "% change in error", then the output will change by the amount in this parameter. But, if the % Error or the %change in error is below the set parameters, the the fuzzy logic kicks in to determine how much and which direction the output will go.
Hope this helps someone.
DeltaV's Fuzzy Logic Controller (FLC) has three tuning parameters. I'm not sure about other manufacturers. They are:
% Error
% Change in Error
% Output
% Error: Very similar to P in PID. It looks at the error between setpoint and actual value. The parameter is in % of full scale of your process value.
% Change in error: How fast the process is approaching setpoint. This is also in % of full scale of your process value.
% Output: When the process value differs more than the "% Error" and the process value is heading in the 'wrong' direction (away from setpoint) by more than the "% change in error", then the output will change by the amount in this parameter. But, if the % Error or the %change in error is below the set parameters, the the fuzzy logic kicks in to determine how much and which direction the output will go.
Hope this helps someone.
