Coffee PID Tuning Log
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| Date | Comments
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| 3/19/05 |
- Initial autotune, P=6.8% I=104.5 Sec, D=20.1 Sec, AR=4.54% (overshoot ~20deg, about 5 min to stablize)
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| 3/20/05 |
- Set FUZZY, autotune, P=6.8% I=109.2 Sec, D=21.0 Sec, AR=4.76% (overshoot ~20deg, 10 min to stablize)
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| 3/21/05 |
- Manually set PID control, P=6.8% I=104.5 Sec, D=40.0 Sec, AR=4.54% (overshoot ~20deg, some undershoot, 8 min stable)
Same as autotune except D=40.0 instead of 20.1
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| 3/21/05 |
- Set D=100.0 (3/21, 9:00pm) - yuck! (overshoot, undershoot, not stable)
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| 3/22/05 |
- set D=10.0 (overshoot ~21deg, 8-10 min stable)(Command 6,40008,100)
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| 3/22/05 |
- set D=20.1, I=50 Sec (6,40008,201 6,40007,500) ~20deg overshoot, 7deg under, 10 min to stable
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| 3/23/05 |
- set I=200 (6,40007,2000) No overshoot, 22Min stable
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| 3/23/05 |
- Set I=104.5, P=3% (6,40007,1045 6,40006,30) Overshoot 10Deg, stable 7 min, ratty looking plot
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| 3/24/05 |
- Set I=104.5, P=15% (6,40006,150) Overshoot 25Deg, stable 15 min
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| 3/24/05 |
- Autotune mode 2 P=5.5% I=95.1 Sec, D=18.3 Sec, AR=2.26% small overshoot (~3Deg), 5 Min stable
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| 4/09/05 |
- Set P-dF time constant to 1.0 seconds, overshoot less than 3Deg with previous PID Settings
- Autotune again with P-dF at 1.0 - P=3.7% I=85.8S, D=16.5S, AR=3.49%
- 16:00:00 - Set P-dF to 1.0, record Output Duty Cycle
- 17:10:00 - Autotune P=5.5% I=85.8S, D=16.5S, AR2.51%
- 17:50:00 - Setpoint to 300 (Start recording setpoint at 18:02:ish)
- 19:10:ish - play with the alarm settings (AL-1=11, A1-H=5, A1-L=5)
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| 4/16/05 |
- Set cycle time to 1 (from 2) (command 6,40089,1)
- Saved parameters in
20050416-pxr.txt
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| 4/17/05 |
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| 4/22/05 |
- Use steam switch at the same time as brew switch, which changes the setpoint.
This has 2 consequences - first the heater comes on immediatly when starting a pull,
and second, the pull time can be determined. First measured pull was 47 seconds.
| 4/23/05 |
- Saved useful parameters here
- Saved all parameters here
| | 4/25/05 |
- Set duty cycle to 10 seconds (from 1 second) - significant and unconsistant overshoot, poor temperature hold performance
- Saved useful parameters here
| | 4/27/05 |
- Set duty cycle back to 1 second (from 10 seconds)
- Set P=3.7%
- Set Ar=7.50%
- Set P=3.7% I=85.8S, D=16.5S, AR=7.50%)
- Saved useful parameters here
| | 5/03/05 |
- Set temperature to 222.5 (from 225)
| | 5/07/05 |
- Modified temperature plots to only show the time around the espresso pulls.
- Re-ploted all of the May plots
- Added "Pull Time" plot
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