Exhaust gas cleaning system

Details Exhaust gas cleaning system Exhaust gas cleaning system

2004-05-27

2008-03-04

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S285000, C060S287000, C060S291000, C060S292000, C060S295000

Reexamination Certificate

active

07337608

ABSTRACT:
An exhaust gas purifying system causes less torque fluctuation and is capable of preventing the occurrence of white smoke in a regeneration control operation for regenerating a continuous regeneration DPF3. When the continuous regeneration DPF3with an oxidation catalyst3Aa on the upstream side of a filter3Ab is controlled to regenerate, an exhaust throttle valve31provided in an exhaust passage2is closed and a delay multi-step injection control is performed to increase the temperature of the exhaust gas if an exhaust temperature T1at the inlet of the oxidation catalyst3Aa is less than the activation temperature Ta of the oxidation catalyst. After the exhaust temperature T1at the inlet of the oxidation catalyst3Aa has risen to the activation temperature Ta of the oxidation catalyst or higher, the exhaust throttle valve31is opened in a stepwise or continuous manner so that the exhaust temperature T2at the inlet of the filter3Ab rises to a lower limit temperature of PM forced combustion Tb1or higher.

REFERENCES:
patent: 6708487 (2004-03-01), Morimoto et al.
patent: 6817174 (2004-11-01), Igarashi et al.
patent: 6834496 (2004-12-01), Nakatani et al.
patent: 6901747 (2005-06-01), Tashiro et al.
patent: 6966179 (2005-11-01), Onodera et al.
patent: 7246485 (2007-07-01), Ohki et al.
patent: 2001-115822 (2001-04-01), None
patent: 2002-242732 (2002-08-01), None
patent: 2003-83030 (2003-03-01), None
International Search Report dated Sep. 21, 2004 in correspoding PCT Patent Application No. PCT/JP2004/007254.

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