Control methods for setting a reference voltage in an air treatment system
First Claim
1. A method for controlling an air treatment system comprising:
- providing a blower motor operable at first and second speed settings;
in response to a change in operation from the first speed setting to the second speed setting and after a predetermined delay period from the change in operation;
measuring the motor speed at recurring intervals over a measurement period,determining an average measured speed over the measurement period based on a plurality of motor speed measurements,comparing the average measured speed to a predetermined acceptable range for the second speed setting, andadjusting the motor speed if the average measured speed falls outside of the predetermined acceptable range for the second speed setting,wherein the steps of measuring, determining, comparing and adjusting are performed as part of a continuous control loop until the average measured speed falls within the predetermined acceptable range for the second speed setting.
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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.
49 Citations
20 Claims
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1. A method for controlling an air treatment system comprising:
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providing a blower motor operable at first and second speed settings; in response to a change in operation from the first speed setting to the second speed setting and after a predetermined delay period from the change in operation; measuring the motor speed at recurring intervals over a measurement period, determining an average measured speed over the measurement period based on a plurality of motor speed measurements, comparing the average measured speed to a predetermined acceptable range for the second speed setting, and adjusting the motor speed if the average measured speed falls outside of the predetermined acceptable range for the second speed setting, wherein the steps of measuring, determining, comparing and adjusting are performed as part of a continuous control loop until the average measured speed falls within the predetermined acceptable range for the second speed setting. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling an air treatment system, the method comprising:
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providing a control signal to operate a blower motor at a first motor speed setting from among a plurality of motor speed settings; modifying the control signal to operate the blower motor at a second motor speed setting from among the plurality of motor speed settings; measuring motor speed over a sample period in response to the change from the first motor speed setting to the second motor speed setting; determining an average measured speed based on multiple measurements of motor speed within the sample period; comparing the average measured speed to a predetermined acceptable range for the second motor speed setting; and adjusting the control signal if the average measured speed falls outside of the predetermined acceptable range for the second motor speed setting. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for calibrating motor speed for a blower motor in an air treatment system, comprising the steps of:
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providing a blower motor capable of operating at a plurality of motor speed settings; predetermining an acceptable range of blower motor speeds for each of the plurality of motor speed settings; in response to a motor speed setting change, taking a plurality of readings at predetermined intervals from a sensor indicative of motor speed; computing a comparison value as a function of the readings, the comparison value being indicative of average motor speed over a period of time, the comparison value being based on a plurality of motor speed readings; comparing the comparison value to the predetermined acceptable range for the corresponding motor speed setting; adjusting the actual speed of the motor if the comparison value falls outside the predetermined acceptable range by a predetermined amount; and repeating said taking, computing, comparing and adjusting steps until the comparison value falls within the predetermined acceptable range. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification