Exhaust catalyst monitoring arrangement

Details Exhaust catalyst monitoring arrangement Exhaust catalyst monitoring arrangement

2005-08-02

2005-08-02

Nguyen, Tu M. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S274000, C060S276000, C060S285000, C701S103000, C701S107000

Reexamination Certificate

active

06922985

ABSTRACT:
In a motor vehicle having an engine with an exhaust catalyst and an oxygen sensor upstream of the catalyst and an oxygen sensor downstream of the catalyst, a method for detecting whether the catalyst has aged. Over a test block period of time, the method periodically obtains upstream data points from an oxygen sensor located upstream of the catalyst and from and oxygen sensor located downstream of the catalyst. Absolute differences are calculated between consecutive pairs of the upstream data points and the downstream data points. A ratio between the sums of absolute differences is then calculated, and the ratio is used to determine whether the catalyst has aged.

REFERENCES:
patent: 5412941 (1995-05-01), Suzuki et al.
patent: 5545377 (1996-08-01), Fukaya et al.
patent: 5724809 (1998-03-01), Mitsutani et al.
patent: 5732553 (1998-03-01), Mitsutani
patent: 5743086 (1998-04-01), Nagai
patent: 5847271 (1998-12-01), Poublon et al.
patent: 5899062 (1999-05-01), Jerger et al.
patent: 5945597 (1999-08-01), Poublon et al.
patent: 5983629 (1999-11-01), Sawada
patent: 6006153 (1999-12-01), Stander et al.
patent: 6035632 (2000-03-01), Stander et al.
patent: 6425242 (2002-07-01), Booth et al.
SAE Paper 942057, “A Review of the Dual EGO Sensor Method for OBD-II Catalyst Efficiency Monitoring” by J.S. Hepburn et al. , Oct. 17-20, 1994.

Affiliated with

Also associated with

Rating

Exhaust catalyst monitoring arrangement does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Exhaust catalyst monitoring arrangement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exhaust catalyst monitoring arrangement will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3503472