Dew point activation method for exhuast gas sensors
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United States of America
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Jun 8, 2017
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Jun 8, 2017
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Abstract
An emission control system, such as an emission control system for a diesel engine, which includes both a NOx sensor and an electrostatic Particulate Matter (ePM) sensor, and uses the signal from the ePM sensor to determine when it is safe to activate and heat up the NOx sensor after engine ignition. This is performed as soon as moisture clears the exhaust, without having to wait any additional time as a safety factor to maximize the reliability of the NOx sensor against damage from water thermal shock. It also allows for a higher degree of application flexibility for a specific engine and aftertreatment combination to be used in a variety of vehicle applications, environmental conditions, and vehicle operating profiles.
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