Air conditioning control

A method for controlling an air conditioning system of a vehicle, the air conditioning system comprising a blower unit, a duct, an evaporator, a first heater and a first discharge temperature sensor, the evaporator and the first heater being located in the duct, the blower unit being configured to generate an airflow along the duct and to generate the airflow at a variable blower speed, the first discharge temperature sensor being configured to output a first discharge temperature sensed from the airflow in the duct located after the evaporator and first heater, the method comprising:

• calculating a mass flow rate based on the blower speed of the blower unit;
• calculating a first heating level of the air conditioning system based on at least one first heater parameter associated with the first heater;
• and
• calculating an estimated evaporator operating temperature of the evaporator based on the first discharge temperature, the first heating level, and the mass flow rate.