Temperature Control

The IHKA receives a temperature input from the Temperature Control Switch. Inputs from the Ambient Air Temp Sensor, Evaporator Temp Sensor, Interior Temp Sensor and Heater Core Air Temp Sensor are evaluated and a Target Temperature is set. The Target Temperature is the required temperature of the outlet air to achieve the requested temperature.

The IHKA module then signals the servomotor controlling the blend flap in the heater assembly to move the flap to the appropriate position. Feedback information is received by the IHKA from the blend flap servo motor to indicate flap position and confirm flap movement.

The target temperature is constantly updated and, in the automatic mode, also used in further calculations to determine the blower speed and the air distribution.