Filter controller system
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United States of America Patent
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Issued Date -
May 10, 2012
app pub date -
Aug 13, 2002
filing date -
Aug 13, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In order to calculate an estimation of the amount of deposited particulates in a first filter (61) or a second filter (62), a first estimation calculating section (100) for outputting first estimation data (XA) based on pressure differential across the filter and a second estimation calculating section (110) for outputting second estimation data (XB) based on engine operating state are provided, the data between the first estimation data (XA) and the second estimation data (XB) that is the more reliable estimation data in light of engine (2) rotation is selected and whether or not filter regeneration should be conducted is decided. In addition, the difference between the first and second estimation data (XA, XB) is considered and when the difference is larger than a prescribed value, then even if the engine (2) rpm is high, selection of the first estimation data XA, which is apt to be an estimated value of low reliability owing to cracking of the deposited particulates, is avoided.
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