Device for purifying exhaust gas of diesel engines
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United States of America Patent
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-
Jun 1, 2004
Grant Date -
Dec 26, 2002
app pub date -
Jun 19, 2002
filing date -
Jun 20, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A device for purifying exhaust gas of a diesel engine includes a first continuous regeneration type diesel particulate filter (DPF) disposed in the exhaust gas passage of the engine, a second continuous regeneration type DPF having a capacity smaller than the capacity of the first continuous regeneration type DPF and disposed in the exhaust gas passage on the upstream side of the first continuous regeneration type DPF, a by-path surrounding the outer peripheral portion of the second continuous regeneration type DPF, a control valve for opening and closing the by-path, an exhaust gas temperature region-detector for detecting the exhaust gas temperature region of the engine, and a controller for controlling the control valve so as to close the by-path when the exhaust gas temperature region of the engine is in a low temperature region, lower than a predetermined temperature.
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