System for diagnosing deterioration of catalyst

Details System for diagnosing deterioration of catalyst System for diagnosing deterioration of catalyst

2006-04-04

2006-04-04

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, C701S103000

Reexamination Certificate

active

07021044

ABSTRACT:
A diagnostic system in which the accuracy of the diagnosis of the deterioration state of a catalyst in a catalytic converter for cleaning the exhaust gas of an internal combustion engine is enhanced without incurring a rise in cost. The temperature of the catalyst is estimated using the operating-state signal (for example, the flow rate of intake air or the width of a fuel injection pulse) of the engine by a diagnostic device. The conversion efficiency of the catalyst calculated from the outputs of oxygen sensors is corrected using the estimated temperature by the diagnostic device. The deterioration state of the catalyst is diagnosed on the basis of the corrected temperature by the diagnostic device.

REFERENCES:
patent: 4007589 (1977-02-01), Neidhard et al.
patent: 4656829 (1987-04-01), Creps
patent: 5097700 (1992-03-01), Nakane
patent: 5158063 (1992-10-01), Hosoda
patent: 5177464 (1993-01-01), Hamburg
patent: 5280707 (1994-01-01), Nakashima et al.
patent: 5303580 (1994-04-01), Schneider et al.
patent: 5311737 (1994-05-01), Komatsu et al.
patent: 5325664 (1994-07-01), Seki et al.
patent: 5341642 (1994-08-01), Kurihara et al.
patent: 5357754 (1994-10-01), Ogawa et al.
patent: 5381657 (1995-01-01), Takizawa et al.
patent: 5396766 (1995-03-01), Sato et al.
patent: 5400592 (1995-03-01), Mukaihira et al.
patent: 5526643 (1996-06-01), Mukaihira et al.
patent: 5649420 (1997-07-01), Mukaihira et al.
patent: 6343466 (2002-02-01), Mukaihira et al.
patent: 41 22 787 (1992-01-01), None
patent: 41 12 479 (1992-10-01), None
patent: 42 34 420 (1994-04-01), None
patent: 57-2896 (1982-01-01), None
patent: 63-165744 (1988-07-01), None
patent: 3-249320 (1991-11-01), None
patent: 4131762 (1992-05-01), None
patent: 4314953 (1993-03-01), None
patent: 05-098945 (1993-04-01), None
patent: 5-171924 (1993-07-01), None

Affiliated with

Also associated with

Rating

System for diagnosing deterioration of catalyst does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System for diagnosing deterioration of catalyst, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for diagnosing deterioration of catalyst will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3578471