Method and apparatus for evaluating the conversion capability of a catalytic converter
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United States of America Patent
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Dec 19, 2000
Grant Date -
N/A
app pub date -
Feb 1, 1999
filing date -
Jan 31, 1998
priority date (Note) -
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Abstract
The invention is directed to a method for checking an exhaust-gas catalytic converter for an internal combustion engine wherein the oxygen content of the exhaust gas is determined rearward of the catalytic converter and the mean oxygen content of the exhaust gas forward of the catalytic converter is changed in a direction which leads away from the oxygen content previously determined rearward of the catalytic converter. The resulting change of the oxygen fill level of the catalytic converter is determined which results from the change of the average oxygen content. This change is compared to a predetermined limit value. A fault announcement is not made when the predetermined limit value is exceeded before the oxygen content of the exhaust gas rearward of the catalytic converter changes. An arrangement for carrying out the method of the invention is also disclosed.
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