Techniques for identifying when to change an air filter

Details Techniques for identifying when to change an air filter Techniques for identifying when to change an air filter

2007-08-07

2007-08-07

Hofsass, Jeffery (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C073S195000, C324S076490, C702S033000

Reexamination Certificate

active

11052383

ABSTRACT:
A method is performed in an electronic system having (i) hardware configured to perform electronic operations and (ii) an air filter configured to remove contamination from an air stream that cools the hardware. The method, which identifies when to change an air filter, involves obtaining, from a set of particle sensors, a set of sensor signals in response to sensed particles in the air stream. The method further involves generating particle count data and processing the data based on the set of sensor signals, and providing an output signal having one of a first value and a second value based on the particle count data. The output signal indicates that the air filter should be changed when the output signal has the first value. The output signal indicates that the air filter should not be changed when the output signal has the second value.

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Lin et al., Design and Analysis of an Air-Filter Sensor For a Residential Heating and Cooling System, http://www.ijme.us/issues/spring2004/Design—Analysis—AirFilter-21stEng.htm.

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