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Title:
EXHAUST PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2015/092932
Kind Code:
A1
Abstract:
In the present invention, by means of injecting additional fuel into a cylinder during an expansion stroke or an exhaust stroke in the state of a throttle aperture being switched from a base throttle aperture to a rich control throttle aperture and an EGR rate being switched from a base EGR rate to a rich control EGR rate, rich control is performed that temporarily lowers the air-fuel ratio of exhaust gas discharged from an engine combustion chamber. When starting rich control, first the low-pressure-side EGR control valve aperture (VEGRL) is switched to a low-pressure-side EGR control valve aperture (VEGRLR) for rich control. Next, the high-pressure-side EGR control valve aperture (VEGRH) is switched to a high-pressure-side EGR control valve aperture (VEGRHR) for rich control. Next, the throttle aperture (VTH) is controlled, and then the injection of additional fuel (Qa) is started.

Inventors:
NOGI, Yoshito (1 Toyotacho, Toyota-sh, Aichi 71, 〒4718571, JP)
Application Number:
JP2013/084352
Publication Date:
June 25, 2015
Filing Date:
December 20, 2013
Export Citation:
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Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA (1 Toyotacho, Toyota-shi Aichi, 71, 〒4718571, JP)
International Classes:
F02D41/04; F01N3/08; F02D21/08; F02D43/00
Domestic Patent References:
WO2011118044A12011-09-29
Foreign References:
JP2012167562A2012-09-06
JP2003328733A2003-11-19
JP2004245175A2004-09-02
JP2006316757A2006-11-24
JPH0548724A1993-02-26
Other References:
See also references of EP 3085933A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (SEIWA PATENT & LAW, Toranomon 37 Mori Bldg. 5-1, Toranomon 3-chome, Minato-k, Tokyo 23, 〒1058423, JP)
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