EXHAUST-TREATMENT DEVICE FOR A DIESEL ENGINE

Title:

EXHAUST-TREATMENT DEVICE FOR A DIESEL ENGINE

Document Type and Number:

WIPO Patent Application WO/2011/021497

Kind Code:

A1

Abstract:

Provided is an exhaust-treatment device for a diesel engine, said device being capable of suppressing engine noise. In a first stage (P1) of an exhaust-temperature-raising process, a target engine speed is set to a prescribed first target speed (R1) and an intake throttle valve (41) is set to a prescribed first degree of opening (O1). In a second stage (P2), the target engine speed is maintained at the first target speed (R1) and the intake throttle valve (41) is set to a position more closed than the first degree of opening (O1). When a set duration (T2) for the second stage (P2) has come to an end, the intake throttle valve (41) is at a second degree of opening (O2), which is maintained in third and subsequent stages (P3/P4). In said third and subsequent stages (P3/P4), as a set duration (T3/T4) for each stage (P3/P4) passes, the target engine speed is updated to a target speed (R2/R3) higher than the target speed (R1/R2) during the immediately prior stage (P2/P3), and the temperature of DPF1 upstream exhaust gas (12) is increased.

Inventors:

YAMADA SHUICHI (JP)
FUJII YASUO (JP)
INOUE KATSUSHI (JP)
ISHII YUUKI (JP)
MITAMURA KENTA (JP)

Application Number:

PCT/JP2010/063067

Publication Date:

February 24, 2011

Filing Date:

August 03, 2010

Export Citation:

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Assignee:

KUBOTA KK (JP)
YAMADA SHUICHI (JP)
FUJII YASUO (JP)
INOUE KATSUSHI (JP)
ISHII YUUKI (JP)
MITAMURA KENTA (JP)

International Classes:

F01N3/02; B01D53/94; F01N3/24; B01D46/42

Foreign References:

JP2005113752A	2005-04-28
JP2007255304A	2007-10-04
JP2007023883A	2007-02-01
JP2007205240A	2007-08-16
JP2005113752A	2005-04-28

Other References: