Systems and methods for running a NOx self-diagnostic test
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United States of America Patent
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Jun 6, 2017
Grant Date -
Dec 15, 2016
app pub date -
Jun 15, 2015
filing date -
Jun 15, 2015
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Abstract
Methods and systems are provided for detecting NOx sensor degradation based on results from a NOx sensor self-diagnostic (SD) test. In one example, a method may comprise: determining that a nitrogen oxide (NOx) sensor is degraded if outputs received from the sensor via a CAN bus during a self-diagnostic test are outside a threshold range. Additionally, only outputs received from the sensor during a self-diagnostic (SD) test performed after a first completed SD test after a key-off event, where the outputs are generated under conditions where a temperature at the sensor is less than a threshold, and an oxygen concentration is within a threshold range may be used to determine if the sensor is degraded.
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