Fog can inhibit the driver's vision and has been among the highest heating, ventilating, and air conditioning (HVAC) complaints reported in recent J. D. Power Initial Quality Surveys. An automatic fog control system which uses the inputs from a unit such as Delphi's Integrated Dew Point and Glass Temperature (IDGT) sensor operates in conjunction with the automatic climate control system to prevent fogging. Unlike an infrared fog detector, the IDGT measures glass temperature, air temperature under the sensor, and the relative humidity of the air to react prior to fog occurring. Recent enhancements in the sensor include improved response for the capacitive humidity sensor in the 80 to 100 percent relative humidity range and more accurate (2 percent) thermistors to measure the fogging condition more accurately. For more information on Delphi's IDGT sensor go to: http://rbi.ims.ca/4914-502
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