Control methods for setting a reference voltage in an air treatment system
First Claim
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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Abstract
A control system and associated methods for an air treatment system. In one aspect, the present invention provides a control system and method for controlling blower speed as a function of separately determined smoke and dust concentrations. In one embodiment, the control system and method provides a variable delayed between changes in motor speed to address undesirable rapid changes between speeds. In another aspect, the present invention provides a system and method for calibrating a sensor to provide more uniform operation over time. In yet another aspect, the present invention provide a system and method for calibrating motor speed to provide more consistent and uniform motor speed over time. The present invention also provides a system and method for tracking filter life by as a function of time, motor speed and/or a sensed variable, such as particulate concentration in the environment.
32 Citations
18 Claims
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1. An air treatment system comprising:
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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, and control operation of the blower motor at one the plurality of blower speeds in accordance with the correlated subrange. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An air treatment system comprising:
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a blower motor operable at a plurality of blower speeds; a particulate sensor operable to provide an output voltage; and a controller operable to control the blower speed based at least partially on the output voltage of the particulate sensor and a reference voltage stored to computer readable memory, the controller being further operable to; receive a plurality of output voltage readings of the particulate sensor, reset the reference voltage as a function of the lowest value from among a plurality of values that are based on the plurality of output voltage readings, determine a plurality of subranges of particulate sensor output voltages for the plurality of blower speeds, respectively, wherein each subrange includes a variable size that is determined as a function of the reference voltage as reset by the controller, sample a further output voltage from the particulate sensor, correlate the further output voltage from the particulate sensor with one of the plurality of subranges, and select the blower speed based on the further output voltage of the particulate sensor relative to the plurality of subranges. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification