| ADC | analogue-to-digital converter |
| H-WA | hot-wire anemometer |
| ρ | air density, kg/m3 |
| R | gas constant for air, J/(kg K) |
| p | atmospheric pressure, Pa |
| T | air temperature, K |
| Δp | dynamic pressure, Pa |
| wx | local air velocity, m/s |
| w | average airflow velocity, m/s |
| n | crankshaft rotation frequency, rpm |
| U | electrical voltage, V |
| i | electric current, A |
| τo | time constant, s |
| τ | time, s |
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