Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2005-04-12
2005-04-12
Wolfe, Willis R. (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C701S108000, C701S109000, C701S115000, C123S697000, C060S274000, C060S275000, C060S277000, C060S285000
Reexamination Certificate
active
06879906
ABSTRACT:
A system and method for controlling an internal combustion engine determine a catalyst gain based on an exhaust gas sensor positioned upstream relative to a catalyst and at least one exhaust gas sensor positioned downstream relative to at least a portion of the catalyst and use the gain to determine the condition or performance of the catalyst. The gain may be determined by modeling the catalyst as an integrator with an unknown gain and estimating the gain using a polynomial approximation. The gain is compared to an expected value or threshold associated with current operating conditions, such as catalyst temperature and/or mass air flow.
REFERENCES:
patent: 5115639 (1992-05-01), Gopp
patent: 5359852 (1994-11-01), Curran et al.
patent: 5485382 (1996-01-01), Seki et al.
patent: 5732552 (1998-03-01), Matsumoto et al.
patent: 5966930 (1999-10-01), Hatano et al.
patent: 6073073 (2000-06-01), Kitamura et al.
patent: 6233922 (2001-05-01), Maloney
patent: 6253542 (2001-07-01), Omara et al.
patent: 6308697 (2001-10-01), Surnilla et al.
patent: 6311680 (2001-11-01), Bradley et al.
patent: 6314723 (2001-11-01), Ketterer et al.
Kerns James Michael
Makki Imad Hassan
Smith Stephen B.
Surnilla Gopichandra
Ford Global Technologies LLC
Hoang Johnny H.
Lippa Allen J.
Wolfe Willis R.
LandOfFree
Engine control and catalyst monitoring based on estimated... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Engine control and catalyst monitoring based on estimated..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Engine control and catalyst monitoring based on estimated... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3410616