Method and apparatus for detecting a non-operational status...

Details Method and apparatus for detecting a non-operational status... Method and apparatus for detecting a non-operational status...

2007-10-09

2011-10-18

Denion, Thomas E. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S274000, C060S276000, C060S286000

Reexamination Certificate

active

08037672

ABSTRACT:
A quantity of unburned fuel is provided through a combustion chamber of an engine and an exhaust conduit to a catalytic converter. The catalyst in the converter is determined to be non-operational if a post-catalyst temperature sensor does not indicate a sufficient temperature increase between readings before and after provision of the unburned fuel to the combustion chamber. The unburned fuel may be provided by withholding spark ignition to create a misfire in the combustion chamber or, particularly in a direct injection engine, by injecting the fuel during the exhaust stroke.

REFERENCES:
patent: 6263666 (2001-07-01), Kubo et al.
patent: 6408616 (2002-06-01), Mazur et al.
patent: 6487852 (2002-12-01), Murphy et al.
patent: 6523341 (2003-02-01), Rumpsa et al.
patent: 7082752 (2006-08-01), Plote et al.
patent: 7121085 (2006-10-01), van Nieuwstadt

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