Patent ID: 6945323

Claim:
An automotive air conditioning system, comprising: an air conditioning duct having an outlet; an evaporator that cools air inside the air conditioning duct; a beater core that heats air inside the air conditioning duct; an air mix door that divides air passing through an interior of the air conditioning duct into a hot side air which is made to pass through the heater core and a non-hot side air which is made to bypass the heater core; an outlet air temperature sensor downstream of the evaporator and heater core that detects a temperature of air at the outlet; a control unit that is connected to the outlet air temperature sensor; a primary bypass passageway bypassing the heater core which is defined by the air mix door; a secondary bypass passageway bypassing the heater core in addition to the primary bypass passageway; and a cold air controlling door that controls a flow rate of air in the secondary bypass passageway; wherein the control unit includes: an air mix door opening setting means for setting an opening for the air mix door so as to obtain air conditioned to the target outlet air temperature when the cold air controlling door is opened to an initial opening; and a cold air controlling door controlling means for controlling the opening of the cold air controlling door to cause a temperature detected by the outlet air temperature sensor to approach the target outlet air temperature.