Air conditioning system for vehicle

An air conditioning system of a vehicle, comprising:

• a controller;
• and
• a plurality of sensors in communication with the controller, the plurality of sensors comprising:
• a means for sensing a temperature of an interior of the vehicle, and
• a means for sensing an inner surface temperature of a windshield of the vehicle,
• wherein:
• the controller is configured to determine a dew-point of the interior of the vehicle from the sensed interior temperature,
• the controller is further configured to adjust the dew-point or the inner surface temperature using a means for correction, and
• the controller is further configured to perform a defogging operation when the inner surface temperature is less than the dew-point, wherein the dew-point or the inner surface temperature is adjusted.

A method to defog vehicle window glass, the method comprising:

• determining a temperature of a vehicle interior;
• determining a dew-point based on the determined temperature of the vehicle interior;
• determining an inner surface temperature of a windshield;
• adjusting the dew-point or the inner surface temperature based on a correction value;
• comparing the inner surface temperature to the dew-point;
• and
• performing a defogging operation when the inner surface temperature is less than the dew-point, wherein the dew-point or the inner surface temperature is adjusted.