Diagnosing an aftertreatment system with a nonthermal plasma...

Details Diagnosing an aftertreatment system with a nonthermal plasma... Diagnosing an aftertreatment system with a nonthermal plasma...

2004-03-19

2008-11-25

Denion, Thomas E (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

C060S274000, C060S275000, C060S286000, C060S301000

Reexamination Certificate

active

07454895

ABSTRACT:
The invention is a method for diagnosing operation of a nonthermal plasma discharge device and a lean NOx trap disposed in the exhaust of an internal combustion engine. The method further includes reducing power to the nonthermal plasma discharge device and determining that the nonthermal plasma discharge device is operating properly when a concentration of NOx of exhaust gases exiting the lean NOx trap increases in response to reducing power to the nonthermal plasma discharge device. Additionally, the nonthermal plasma discharge device is found not to be operating when the NOx concentration remains substantially constant in response to a decrease in power supplied to the nonthermal plasma discharge device.

REFERENCES:
patent: 5970706 (1999-10-01), Williamson et al.
patent: 6038853 (2000-03-01), Penetrante et al.
patent: 6363714 (2002-04-01), Hoard et al.
patent: 6363716 (2002-04-01), Balko et al.
patent: 6532733 (2003-03-01), Tamura et al.
patent: 7043902 (2006-05-01), Nakanishi et al.
patent: 2004/0093853 (2004-05-01), Hemingway et al.

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