Method and device for controlling a NOx storage catalyst that is arranged in an exhaust gas channel of a combustion engine
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United States of America Patent
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Mar 16, 2004
Grant Date -
Feb 27, 2003
app pub date -
Aug 9, 2002
filing date -
Jan 26, 2000
priority date (Note) -
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Abstract
The invention relates to a method for controlling a NO.sub.x storage catalyst by means of a NO.sub.x -sensitive measuring device, especially a NO.sub.x sensor, that is arranged downstream in relation to the NO.sub.x storage catalyst which is arranged in an exhaust gas channel of a combustion engine. According to the invention, a reference time (t.sub.0) is determined by means of a signal path of the NO.sub.x -sensitive measuring device (18) after the combustion engine (10) has been switched into a lean operating mode. Said reference time is used as the timely starting point for controlling processes being related to the NO.sub.x storage catalyst (16). The invention also relates to a device for carrying out the method. According to said device, means are provided by means of which the following procedure steps can be carried out: determining a reference time (t.sub.0) by means of a signal path (SV) of the NO.sub.x -sensitive measuring device (18) after regeneration of the NO.sub.x storage catalyst (16) and using the reference time (t.sub.0) as the timely starting point for controlling processes of the NO.sub.x storage catalyst (16).
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