Exhaust gas purification system for internal combustion...

Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...

Reexamination Certificate

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Details

C060S274000, C060S285000, C060S295000, C060S290000

Reexamination Certificate

active

08037675

ABSTRACT:
A PM catalyst regeneration control for the purpose of “soot removal” is performed prior to a sulfur poisoning recovery control. In the PM catalyst regeneration control, PM deposits in a catalyst are burned. A target throttle opening degree for the sulfur poisoning recovery control is preset smaller than a target throttle opening for the PM catalyst regeneration control in order to reduce the intake air volume during deceleration. A catalyst bed temperature is thus prevented from dropping, and therefore maintained at a level appropriate to sulfur poisoning recovery. Controlling the intake air volume during deceleration in such a manner results in more efficient catalyst recovery from sulfur poisoning, so that the fuel economy is maintained during the sulfur poisoning recovery control.

REFERENCES:
patent: 2005/0022514 (2005-02-01), Kitahara
patent: 2005/0050881 (2005-03-01), Toshioka et al.
patent: 2005/0120712 (2005-06-01), Tsutsumoto et al.
patent: 199 45 336 (2001-03-01), None
patent: 10 2005 014 872 (2005-11-01), None
patent: 2005 014 872 (2005-11-01), None
patent: 1 154 130 (2001-11-01), None
patent: 1 174 600 (2002-01-01), None
patent: 1 365 117 (2003-11-01), None
patent: 1 510 671 (2005-03-01), None
patent: 2005-155500 (2005-06-01), None
Office Action from the German Patent Office for DE 102007027886, dated Aug. 10, 2009.
French Patent Office Communication dated Feb. 16, 2011 for FR 07 04299.

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