Exhaust emission control device

Details Exhaust emission control device Exhaust emission control device

2008-04-09

2011-12-13

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S295000

Reexamination Certificate

active

08074444

ABSTRACT:
An exhaust emission control device has an additive valve and a control unit to decrease nitrogen oxides contained in an exhaust gas by means of a reducing agent. The control unit sets a valve opening period of time and a valve closing period of time alternately elapsing in a repetition cycle. The control unit controls the valve to discharge the agent into the exhaust gas during each valve opening period and to stop discharging the agent during each valve closing period. The control unit sets the valve opening period to be shortened as a flow rate of the exhaust gas is lowered, so that a penetration force of the reducing agent is appropriately set. The control unit sets the repetition cycle at a value depending on the flow rate of the nitrogen oxides to sufficiently deoxidize the nitrogen oxides by means of the agent.

REFERENCES:
patent: 2002/0148219 (2002-10-01), Matsuoka et al.
patent: 2005/0284134 (2005-12-01), Radhamohan et al.
patent: 2007/0101703 (2007-05-01), Kanaya et al.
patent: 2009/0025370 (2009-01-01), Kondo et al.
patent: 2002-038926 (2002-02-01), None
patent: 3686666 (2005-06-01), None
patent: 2006-233936 (2006-09-01), None
patent: 2006233936 (2006-09-01), None
Japanese Office Action dated Feb. 10, 2009, issued in corresponding Japanese Application No. 2007-116656, with English translation.

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