16
E46 Climate Control
Purpose of the System
:
The purpose of the solar sensor is to compensate the climate control system’s output for
the radiant heating effect of the sun. This will aid the IHKA in maintaining a constant com-
fort level, in the vehicle’s interior, during all driving conditions.
The function of heating and air conditioning systems in BMW vehicles is to provide the dri-
ver and passengers a comfortable atmosphere regardless of conditions outside of the vehi-
cle. Based on the temperature signal inputs, blower setting, flaps portioning, program set-
tings in the control module and influencing variables, the IHKA control module is able to
process these inputs to achieve the desired comfort level.
The following input variables are
processed by the IHKA module:
• Interior temperature
• Heat exchanger temperature
• Ventilation temperature (E38)
• Evaporator temperature
• Air volume setting
• Engine temperature and RPM
• Exterior temperature
The processed variable “Y-factor” is determined by using the above inputs. The Y-factor
then represents how much adjustment is necessary by the IHKA module to achieve the set
temperature.
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