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PID Variables
| Variable | Definition |
|---|---|
| i | Time index |
| Δt | Sampling interval |
| T(i) | Measured temperature |
| TSP(i) | Set point temperature |
| e(i) | Temperature error |
| KP | Proportional gain |
| KI | Integral gain |
| KD | Differential gain |
| KWU | Windup gain |
| DF(i) | Duty factor (control variable) |
| DFMIN | Minimum duty factor |
| DFMAX | Maximum duty factor |
| DFTH | Thresholded duty factor |
