Title:
排気浄化システムの故障診断装置
Document Type and Number:
Japanese Patent JP6436075
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve diagnostic accuracy when diagnosing an exhaust emission control system having an SCR filter to determine whether the system is broken.SOLUTION: When an NOx elimination rate of an SCR filter calculated by using a detection value obtained by an NOx sensor provided downstream of the SCR filter is equal to or lower than a prescribed determination elimination rate, a determination that an exhaust emission control system is broken is made. At this time, an increment of a differential pressure conversion value per unit increment of filter PM accumulation amount is defined as a differential pressure change rate. If the differential pressure change rate at time when the detection value obtained by the NOx sensor and used for calculation of the NOx elimination rate is detected is a prescribed threshold value or higher, the abnormality diagnosis is not made.SELECTED DRAWING: Figure 7
Inventors:
Kenji Furui
Toru Kisho
Makoto Ogiso
Yuji Matsumoto
Ken Shirasawa
Toru Kisho
Makoto Ogiso
Yuji Matsumoto
Ken Shirasawa
Application Number:
JP2015254415A
Publication Date:
December 12, 2018
Filing Date:
December 25, 2015
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F01N3/20; B01D53/94; F01N3/035; F01N3/08
Domestic Patent References:
| JP2015010589A | ||||
| JP2017096240A |
Foreign References:
| WO2014087536A1 | ||||
| WO2015093603A1 |
Attorney, Agent or Firm:
Yoshiyuki Kawaguchi
Kazunobu Sera
Akira Hirakawa
Takehiko Sekine
Katsuhiko Imahori
Fuminori Miyashita
Atsushi Kokubo
Kazunobu Sera
Akira Hirakawa
Takehiko Sekine
Katsuhiko Imahori
Fuminori Miyashita
Atsushi Kokubo