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Vehicle automatic defrost system and method

  • US 10,293,657 B2
  • Filed: 02/25/2016
  • Issued: 05/21/2019
  • Est. Priority Date: 02/25/2016
  • Status: Active Grant
First Claim
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1. A system for reducing condensation of an internal surface of a window of a vehicle comprising:

  • an external temperature sensor configured to detect an ambient air temperature of an environment of the vehicle;

    an internal temperature sensor configured to detect an inside air temperature of a cabin of the vehicle;

    an internal moisture sensor configured to detect an inside moisture level of the air inside of the cabin of the vehicle;

    a heating, ventilation and air conditioning system (HVAC) configured to blow air into the cabin of the vehicle at a desired temperature;

    an electronic control unit (ECU) coupled to the external temperature sensor, the internal temperature sensor, the internal moisture sensor and the HVAC and configured to;

    determine a difference between the inside air temperature and the ambient air temperature,set a condensation indicator when the ambient air temperature is less than a first temperature threshold, the difference between the inside air temperature and the ambient air temperature is greater than a second temperature threshold, and the inside moisture level is greater than a moisture threshold,determine a condensation temperature corresponding to a potential temperature of air from the HVAC at which additional condensation will accumulate on the window based on the inside air temperature and the ambient air temperature,determine the desired temperature for the air blown by the HVAC that is warmer than the ambient air temperature and cooler than the condensation temperature based on the inside air temperature and the ambient air temperature, andcontrol the HVAC to blow air at the desired temperature when the condensation indicator is set.

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