Title:
EXHAUST GAS PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2012/029189
Kind Code:
A1
Abstract:
A hydrocarbon supply valve (15) and an exhaust gas purification catalyst (13) are arranged in the engine exhaust gas passage of an internal combustion engine. Platinum Pt (51) is supported on the exhaust gas purification catalyst (13), on which a basic layer (53) is formed. When the engine is operating, a primary concentration-changing operation is performed, whereby the concentration of the hydrocarbons flowing into the exhaust gas purification catalyst (13) is changed with a predetermined amplitude (ΔHA) and a predetermined period (ΔTA). Furthermore, prior to each primary concentration-changing operation a preliminary concentration-changing operation is performed, whereby the hydrocarbon concentration is changed with an amplitude (ΔHB) that is smaller than the amplitude (ΔHA) at the time of each primary concentration-changing operation.
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Inventors:
UMEMOTO KAZUHIRO (JP)
YOSHIDA KOHEI (JP)
INOUE MIKIO (JP)
YOSHIDA KOHEI (JP)
INOUE MIKIO (JP)
Application Number:
PCT/JP2010/065449
Publication Date:
March 08, 2012
Filing Date:
September 02, 2010
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
UMEMOTO KAZUHIRO (JP)
YOSHIDA KOHEI (JP)
INOUE MIKIO (JP)
UMEMOTO KAZUHIRO (JP)
YOSHIDA KOHEI (JP)
INOUE MIKIO (JP)
International Classes:
F01N3/08; F01N3/36
Foreign References:
| JP2007514090A | 2007-05-31 | |||
| JP2008232003A | 2008-10-02 | |||
| JP2008286186A | 2008-11-27 | |||
| JP2008267217A | 2008-11-06 | |||
| JP3969450B2 | 2007-09-05 |
Other References:
See also references of EP 2610450A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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Claims: