Exhaust gas purification system for internal combustion engine

Details Exhaust gas purification system for internal combustion engine Exhaust gas purification system for internal combustion engine

2011-07-19

2011-07-19

Tran, Binh Q (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S285000, C060S287000, C060S297000, C060S301000

Reexamination Certificate

active

07980059

ABSTRACT:
An object is to estimate the degree of deterioration of an NOx catalyst with improved accuracy in an exhaust gas purification system having the NOx catalyst provided in an exhaust passage. According to the present invention, an NOx sensor is provided downstream of an NOx catalyst, and the difference between an estimated value of the NOx concentration in the exhaust gas in the exhaust passage upstream of the NOx catalyst and a detection value of the NOx sensor at a time when NOx in the exhaust gas is not removed in the NOx catalyst is calculated. In addition, in estimating the degree of deterioration of the NOx catalyst, the estimated value of the NOx concentration in the exhaust gas in the exhaust passage upstream of the NOx catalyst is corrected based on this difference, and the degree of deterioration of the NOx catalyst is estimated based on the difference between this corrected value and the detection value of the NOx sensor.

REFERENCES:
patent: 5201802 (1993-04-01), Hirota et al.
patent: 5693877 (1997-12-01), Ohsuga et al.
patent: 5713199 (1998-02-01), Takeshima et al.
patent: 5987883 (1999-11-01), Schneider
patent: 6151888 (2000-11-01), Schneider et al.
patent: 6389802 (2002-05-01), Berger et al.
patent: 6487849 (2002-12-01), Bidner et al.
patent: 6658841 (2003-12-01), Beer et al.
patent: 7150144 (2006-12-01), Nakagawa et al.
patent: 2003/0163987 (2003-09-01), Schnaibel et al.
patent: 0 498 598 (1992-08-01), None
patent: 7-208151 (1995-08-01), None
patent: 10-68314 (1998-03-01), None
patent: 2888124 (1999-02-01), None
patent: 11-294149 (1999-10-01), None
patent: 2001-32745 (2001-02-01), None
patent: 2004-504539 (2004-02-01), None
Database WPI Week 200009, XP-002563838, dated Jan. 21, 2010.
Extended European Search Report for EP Appl. No. 06842961.2, mailed Jan. 29, 2010.

Affiliated with

Also associated with

Rating

Exhaust gas purification system for internal combustion engine 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 gas purification system for internal combustion engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exhaust gas purification system for internal combustion engine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2654985