Model based diagnostics of an aftertreatment fuel dosing system

Details Model based diagnostics of an aftertreatment fuel dosing system Model based diagnostics of an aftertreatment fuel dosing system

2007-08-21

2007-08-21

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S274000, C060S276000, C060S286000, C060S303000

Reexamination Certificate

active

11374699

ABSTRACT:
The invention relates to systems and methods of detecting faults in an exhaust line fuel injection system. An expected relationship between a temperature within the exhaust system and a commanded fuel injection rate or amount is compared to an actual relationship in order to detect faults. The temperature is preferably a temperature of, within, or downstream of an exhaust system device that catalyzes an oxidation or partial oxidation reaction of the fuel, such as an oxidation catalyst or a fuel reformer. The expected relationship may be defined in terms of a thermal model of a system comprising the catalytic device. The invention can be used to detect spray quality faults or to detect fuel injector faults without the use of flow meter.

REFERENCES:
patent: 6408616 (2002-06-01), Mazur et al.
patent: 6487852 (2002-12-01), Murphy et al.
patent: 6983589 (2006-01-01), Lewis et al.
patent: 7082753 (2006-08-01), Dalla Betta et al.
patent: 2002/0107651 (2002-08-01), Haller et al.
patent: 2002/0150532 (2002-10-01), Grieve et al.
patent: 2003/0101713 (2003-06-01), Dalla Betta et al.
patent: 2004/0076565 (2004-04-01), Ganhji et al.

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