Signal shape and setpoint values
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The electronic evaluation unit digitizes the signal of the heating wire air mass flow sensor. This signal is then transferred pulse-width modulated to the DDE control unit. The signal quality for the air mass is temperature-dependent. High accuracy is required to precisely determine the air mass. This is why the air mass signal received in the engine control unit must be corrected with the signal of the intake air temperature sensor.
| Item | Explanation |
|---|---|
| 1 | Output frequency |
| 2 | Characteristic curve of heating wire air mass flow sensor |
| 3 | Air mass |
Observe the following target values for the heating wire air mass flow sensor:
| Variable | Value |
|---|---|
| Supply voltage | 13.4 to 13.6 V |
| Sensor voltage | 4.9 to 5.1 V |
| Maximum current consumption for heating wire air mass flow sensor | 15 mA |
| Frequency range of heating wire air mass flow sensor | 1 to 9.5 kHz |
| Measuring range of intake air temperature | -40 °C to 110 °C |
| Temperature range | -40 °C to 120 °C |