Tuning a pH PID Controller
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Transcript of Tuning a pH PID Controller
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TUNING A PH PID CONTROLLERJulia FletcherRenee ChuangAnthony YeomanJiayue Yu University of California, San DiegoJacobs School of Engineering
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A batch system, with a strong acid and base was under investigation.
Transmits Signal
(http://ucsd-ceng-176.wikia.com)
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The PBS solution was titrated to identify the buffer region.
0 20 40 60 80 100 120 140 160 1800
2
4
6
8
10
12Titration Curve
Time(s)
pH
Buffer Region = 6.5 - 7.8 pH
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An open loop step change was used to determine Kp & of the
system.
KKp: .000954
: 24.17
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The Direct synthesis method was used to derive equations for controller coefficients.
System Model
Controller Coefficients
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The coefficients found via direct synthesis was observed to reach set point at 120 seconds.
0 20 40 60 80 100 120 140 1606.8
7
7.2
7.4
7.6
7.8
8
8.2
Time(s)
pH
24.17
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Controller coefficients were doubled and compared to each other.
0 20 40 60 80 100 120 1406.8
7
7.2
7.4
7.6
7.8
8
8.2
Double KcDouble tau_deriDirect SynthesisSet point
Time(s)
pH
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In summary, direct synthesis is a favorable tuning method when trying to control pH.
(www.setis-systems.com)
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In summary, direct synthesis is a favorable tuning method when trying to control pH.
Questions?(www.setis-systems.com)