Method for determining a NOx concentration
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United States of America Patent
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Mar 2, 2004
Grant Date -
Dec 5, 2002
app pub date -
May 28, 2002
filing date -
Nov 25, 1999
priority date (Note) -
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Abstract
A thick-film measurement sensor includes two measurement cells and is used to measure the NOx concentration in the exhaust gas from an internal combustion engine. The 1/.lambda. value of the exhaust gas is determined from an oxygen ion pump current flowing in the first measurement cell, for example, by a characteristic diagram, and, a measurement error, which can be used to correct the measured NOx concentration, is determined from this 1/.lambda. value, for example, by a characteristic curve that has previously been determined in a calibration measurement. The invention is based on the discovery that the measurement error is dependent on the air ratio in the exhaust gas. If this is expressed by the 1/.lambda. value, there is no need for a complex division calculation during the correction.
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