Monitoring air filter status in automotive HVAC system
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United States of America Patent
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Sep 1, 2015
Grant Date -
Oct 31, 2013
app pub date -
Apr 27, 2012
filing date -
Apr 27, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A system and methods are provided for monitoring for a clogged or unclogged state of an air filter in an automotive HVAC system. The HVAC system includes a blower having a blower motor providing a driven airflow. A plurality of outlet registers is controllable to provide a plurality of circulation modes. An evaporator selectably cools the driven airflow, and the air filter passes the driven airflow. The method enters a baseline condition, wherein the baseline condition includes applying a moisture purge to the evaporator and selection of a predetermined circulation mode. The blower motor is controlled to maintain a testing speed. An energization of the blower motor is quantified while maintaining the testing speed. The energization is compared to a base value derived according to the baseline condition with the air filter in an unclogged state. A replacement action is triggered when the energization is greater than the base value.
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