Engine exhaust gas leak diagnosis

Details Engine exhaust gas leak diagnosis Engine exhaust gas leak diagnosis

2005-08-23

2005-08-23

Nguyen, Tu M. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

C060S274000, C060S277000, C060S285000, C073S023320

Reexamination Certificate

active

06931838

ABSTRACT:
Oxygen sensors (3, 13) are provided upstream and downstream of a three-way catalytic converter (10) in an exhaust passage (9) of an internal combustion engine (1). A controller (2) performs feedback correction of an air-fuel ratio of an air-fuel mixture burnt in the engine (1) by proportional/integral control based on the output of the upstream oxygen sensor (3). In this process, the controller (2) corrects a proportional part by a correction value based on the output of the downstream oxygen sensor (13) (S11, S12). The feedback correction is performed based on a feedback correction coefficient calculated using the proportional part and an integral part. The controller (2) further determines if there is a leak in the exhaust passage (9) based on the correction value (S61) (S62). Higher diagnostic precision is obtained than in the case where the determination is performed based directly on the feedback correction coefficient.

REFERENCES:
patent: 5351526 (1994-10-01), Krohm et al.
patent: 5398501 (1995-03-01), Ito et al.
patent: 5529043 (1996-06-01), Nagaishi et al.
patent: 5617722 (1997-04-01), Takaku
patent: 6594987 (2003-07-01), Uranishi
patent: 6684869 (2004-02-01), Ponagai et al.
patent: 3075079 (2000-06-01), None

Affiliated with

Also associated with

Rating

Engine exhaust gas leak diagnosis 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 exhaust gas leak diagnosis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Engine exhaust gas leak diagnosis will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3507285