Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Eric B. Andrews0
Jeffrey M. Weikert0
Date of Patent
September 4, 2007
Patent Application Number
10855811
Date Filed
May 27, 2004
Patent Primary Examiner
Patent abstract
A system for measuring NOx content of an exhaust gas produced includes at least one controllable valve operable to direct exhaust gas to a NOx sensor only when measurement of the NOx content is desired and to otherwise expose the NOx sensor to ambient air. A control circuit controls the operation of the at least one valve and determines the NOx content of the exhaust gas based on sensory data received from the NOx sensor.
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