Brief description of components: Sensors
- Internal temperature sensor
The internal temperature sensor is built into the IHKA control module. The internal temperature sensor measures the temperature in the control module. This measured temperature is used by an integrated mathematical model to calculate the value for the interior temperature.
The internal temperature sensor is not force-ventilated. This means that no internal temperature sensor fan is fitted in the IHKA control module.
NOTE: The value displayed in the BMW diagnosis system for the inside temperature deviates very strongly from the perceived temperature value and the set desired temperature value. This measured value is processed internally in the IHKA control module and adapted for the control operation. - Ventilation temperature sensor
The ventilation temperature sensor is integrated in the solar sensor. The ventilation temperature sensor measures the delivery temperature directly at the upper ventilation air vents.
- Solar sensor
The solar sensor consists of a photo diode. The solar sensor picks up external light or heat sources (e.g. sunlight). The solar sensor provides the IHKA control module with an analog signal depending the intensity of the sunlight in each case.
Adaptation to the sunlight is only active in the automatic program. The solar sensor is fitted in the center of the instrument panel.
- Evaporator temperature sensor
The evaporator temperature sensor measures the outlet temperature of the air at the evaporator to prevent freezing over. The evaporator temperature sensor is directly connected to the IHKA control module.
- Coolant pressure sensor
The coolant pressure sensor is fitted in the pressure line between the condenser and the evaporator. Depending on the sensor signal, the air-conditioning compressor is regulated by the IHKA control module in the event of excessive refrigerant pressure. The junction box supplies the coolant pressure sensor with voltage. The data is evaluated in the junction box electronics. The prepared data is sent across the body CAN (K-CAN) to the IHKA control module.