Method of monitoring a differential pressure sensor of an exhaust gas treatment system
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United States of America Patent
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Feb 4, 2014
Grant Date -
Dec 12, 2013
app pub date -
Jun 7, 2012
filing date -
Jun 7, 2012
priority date (Note) -
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Abstract
A method of monitoring a differential pressure sensor of an exhaust gas aftertreatment system includes sensing a learned value (n−1, n, n+1, n+2, etc.) of the differential pressure sensor for each after-run occurrence of the vehicle, and calculating an absolute value of a rate of change between a current (n) learned value of the differential pressure sensor and a previous (n−1) learned value of the differential pressure sensor. The absolute value of the rate of change is compared to a threshold pressure value to determine if the absolute value of the rate of change is greater than the threshold pressure value or is less than the threshold pressure value. A fault in the differential pressure sensor is signaled when the absolute value of the rate of change of the learned values is greater than the threshold pressure value.
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