Solar Sensor: Description and Operation

Sun Sensor







This sensor is located in the middle of the dashboard. The sensor is supplied with a reference voltage of 5.0 V. The measured values are subject to 2 different time constants so as to rule out any disruption in the system if the sun intensity changes briefly (e.g. driving through a tunnel, on tree lined streets, etc.). This means that the system only responds to changes in sun intensity after this time has elapsed. A different mean time constant applies for increasing and decreasing sun intensity respectively.

- Increasing sun intensity (t in seconds): t(1/3) = 60, t(1/3) = 120, t(1/3) = 240
- Decreasing sun intensity (t in seconds): t(1/3) = 60, t(1/3) = 60, t(1/3) = 120

The evaluation of these changes in sun intensity is employed to control the drive motor of the temperature mix flap and to correct the air flow rate (fan adjustment).