Automatic air recirculation control sensor

The Body Domain Controller (BDC) reads the sensor signals of the sensor for the automatic air recirculation control. The Body Domain Controller (BDC) converts the sensor signals into a message on the local interconnect network bus.

The automatic air recirculation control sensor evaluates the concentration of carbon monoxide and nitrogen oxides in the intake fresh air. If the automatic air recirculation control sensor measures an emission value that is too high, an automatic changeover recirculated air operation takes place via the IHKA control unit (prerequisite: IHKA in the automatic mode).

Because of the lack of a fresh-air supply, air-recirculation mode is only available for a limited period of time. When the engine is started and the AUC function activated, fresh air is always selected for a few seconds (for example approx. 40 seconds) due to the warming phase of the AUC sensor.