Exhaust emission control device and method for internal...

Details Exhaust emission control device and method for internal... Exhaust emission control device and method for internal...

2007-11-21

2009-11-17

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

C423S213700, C423S239100, C423SDIG018, C060S272000, C060S273000, C060S274000, C060S276000, C060S282000, C060S299000, C422S105000, C422S108000, C422S110000, C422S111000, C700S266000, C700S274000, C700S102000

Reexamination Certificate

active

07618605

ABSTRACT:
An exhaust emission control device for an internal combustion engine, which is capable of supplying a just enough amount of reducing agent to a NOx catalyst, thereby reducing exhaust emission and improving fuel economy. The device includes a three-way catalyst, a NOx catalyst provided downstream of the three-way catalyst, and an ECU. The ECU carries out rich spike control such that exhaust gases flowing into the NOx catalyst form a reducing atmosphere. During the control, the ECU calculates a reducing agent consumption amount of reducing agent in the exhaust gases consumed by the three-way catalyst, calculates a cumulative reducing agent amount as a total amount of reducing agent supplied to the NOx catalyst, depending on the reducing agent consumption amount, and terminates the control when the cumulative reducing agent amount becomes larger than a predetermined value.

REFERENCES:
patent: 6470673 (2002-10-01), van Nieuwstadt et al.
patent: 2008/0120963 (2008-05-01), Morita et al.
patent: 2008/0120965 (2008-05-01), Morita et al.
patent: 2008/0306631 (2008-12-01), Huang
patent: 2009/0084087 (2009-04-01), Odajima et al.

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