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Control methods for setting a reference voltage in an air treatment system

  • US 10,571,394 B2
  • Filed: 01/05/2017
  • Issued: 02/25/2020
  • Est. Priority Date: 07/14/2005
  • Status: Active Grant
First Claim
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1. An air treatment system comprising:

  • a blower motor operable at a plurality of blower speeds;

    a light sensor operable to provide an output; and

    a controller operable to;

    take a plurality of sample readings from the light sensor,set a reference voltage as a function of the lowest value from among a plurality of values that are based on the plurality of sample readings,determine a plurality of subranges of light sensor output values for the plurality of blower speeds, respectively, wherein each of the plurality of subranges includes a variable size that is determined as a function of the reference voltage as set by the controller,take a further reading from the light sensor,correlate the further reading from the light sensor with one of the plurality of subranges, andcontrol operation of the blower motor at one the plurality of blower speeds in accordance with the correlated subrange.

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