Title:
TROUBLE DIAGNOSIS DEVICE OF NOX CONCENTRATION ESTIMATION DEVICE AND EXHAUST GAS RECIRCULATION DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP3728802
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To find out troubles of an EGR unit with high accuracy.
SOLUTION: When respective conditions (S51-S57) containing the control condition provided by an EGR are satisfied, NOx concentration is estimated based on a secondary corrected air fuel quantity PHOS, so that the EGR is cut (S58-S65) when the estimated value is greater than a prescribed value given to the present operation area. Similarly the NOx concentration at the time when the EGR is cut from the POHS is estimated (S62-S65), so that under the supposition of the same operation area, the deviation of the estimation valve of the NOx concentration during the use of the EGR from the value during the cutting of the EGR is calculated, and if the deviation is small compared with critical value corresponding to the operation area, EGR is recognized to be in trouble (S67→S69).
Inventors:
Mikio Matsumoto
Kiyoshi Akiyama
Hideki Uema
Hirofumi Tsuchida
Kiyoshi Akiyama
Hideki Uema
Hirofumi Tsuchida
Application Number:
JP14030196A
Publication Date:
December 21, 2005
Filing Date:
June 03, 1996
Export Citation:
Assignee:
Nissan Motor Co., Ltd
International Classes:
F02M25/07; F02D21/08; F02D41/14; F02D45/00; (IPC1-7): F02D41/14; F02D21/08; F02D45/00; F02M25/07
Domestic Patent References:
| JP8068362A | ||||
| JP7180615A |
Attorney, Agent or Firm:
Tomijio Sasashima
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