I was looking around online about PID Tuning Software and came across this website:
http://bestune.50megs.com/
On this company's / person's website, they have a document listing the types of PID Equations used in the software (see attached Word document). One of them is "Type C" (an independent PID equation) which uses the PV in the proportional term instead of the error:
Why would you want to control your output based on the process variable, with no reference to the setpoint?
Wouldn't this only be useful when you have I or D control? In that case, you would have a slower loop; you would have to wait for the integral error to add up and the PV to start changing to see contributions from the I and D terms. For sufficiently high PVs, if your integral gain Ki is too small, it would may take forever for integral action to kick in.
Has anyone used this form of he equation before? If so, for what applications?
http://bestune.50megs.com/
On this company's / person's website, they have a document listing the types of PID Equations used in the software (see attached Word document). One of them is "Type C" (an independent PID equation) which uses the PV in the proportional term instead of the error:
Why would you want to control your output based on the process variable, with no reference to the setpoint?
Wouldn't this only be useful when you have I or D control? In that case, you would have a slower loop; you would have to wait for the integral error to add up and the PV to start changing to see contributions from the I and D terms. For sufficiently high PVs, if your integral gain Ki is too small, it would may take forever for integral action to kick in.
Has anyone used this form of he equation before? If so, for what applications?