Method for restricting excessive temperature rise of filter in internal combustion engine
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United States of America Patent
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Jan 9, 2007
Issued Date -
N/A
app pub date -
Sep 9, 2004
filing date -
Sep 22, 2003
priority date (Note) -
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Abstract
A method for restricting an excessive temperature rise in an internal combustion engine according to the present invention can provide a technology that enable to restrict an excessive temperature rise of a filter more reliably in an internal combustion engine having the filter provided in the exhaust passage for collecting particulate matter in the exhaust gas. In that method, when the running state of the internal combustion engine becomes idle running during the filter regeneration process, the oxygen concentration in the exhaust gas flowing into the filter is reduced. After that, when the running state of the internal combustion engine shifts from the idle running to a running state with an engine load higher than in the idle running, the oxygen concentration in the exhaust gas flowing into the filter is gradually increased.
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