Power plants – Internal combustion engine with treatment or handling of... – Having sensor or indicator of malfunction – unsafeness – or...
Reexamination Certificate
2006-11-07
2006-11-07
Tran, Binh Q. (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
Having sensor or indicator of malfunction, unsafeness, or...
C060S274000, C060S276000, C060S285000, C073S118040, C123S674000
Reexamination Certificate
active
07131261
ABSTRACT:
A method for diagnosing a catalytic converter (7), which is arranged in an exhaust-gas system (6) of an internal combustion engine (1) has the steps of: detecting the signal (USHK) of an exhaust-gas probe (9) downstream of the catalytic converter; forming a limit value model amplitude (AHKF) from at least one quantity (ML, n) which occurs upstream of the catalytic converter (7); forming a catalytic converter evaluation quantity (DKATI) whose value increases with increasing deviation of the amplitude (AHK) of the signal (USHK) from the limit value model amplitude (AHKF); evaluating the operability of the catalytic converter (7) on the basis of the catalytic converter evaluation quantity (DKATI); stopping the evaluation when an oxygen-dependent catalytic converter load (KATIN) exceeds or drops below a threshold value. The method is characterized in that the threshold value is pregiven in dependence upon the signal (USHK) of the exhaust-gas probe (9) rearward of the catalytic converter.
REFERENCES:
patent: 4622809 (1986-11-01), Wollenhaupt et al.
patent: 5842339 (1998-12-01), Bush et al.
patent: 5857163 (1999-01-01), Trombley et al.
patent: 5987883 (1999-11-01), Schneider
patent: 6105366 (2000-08-01), Zhang
patent: 6145302 (2000-11-01), Zhang et al.
patent: 6151888 (2000-11-01), Schneider et al.
patent: 6499291 (2002-12-01), Lang et al.
Schneider Erich
Wackerow René
Ottesen Walter
Robert & Bosch GmbH
Tran Binh Q.
LandOfFree
Method and electronic control unit for diagnosing a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and electronic control unit for diagnosing a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and electronic control unit for diagnosing a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3675089