Title:
ABNORMALITY DIAGNOSIS DEVICE OF REDUCTANT ADDITION DEVICE
Document Type and Number:
Japanese Patent JP2019105259
Kind Code:
A
Abstract:
To suppress the lowering of diagnosis accuracy caused by an influence of a pump discharge capacity, in an abnormality diagnosis device of a reductant addition device.SOLUTION: In this abnormality diagnosis device for diagnosing an abnormality of a reductant addition device by acquiring a diagnosis parameter being a parameter correlated to a pressure lowering amount in a reductant passage, and comparing the diagnosis parameter and a prescribed threshold in the case that an addition valve is valve-opened while maintaining an application voltage of a pump at a diagnosis voltage from a state that the application voltage of the pump is controlled to the diagnosis voltage so that the addition valve is brought into a valve-closed state, and pressure in the reductant passage reaches prescribed pressure, the abnormality diagnosis device comprises: pump discharge capacity acquisition means for acquiring a pump discharge capacity of the pump; and correction means for correcting the diagnosis parameter or the prescribed threshold on the basis of the pump discharge capacity. The abnormality diagnosis device diagnoses the abnormality by using the corrected diagnosis parameter, or the corrected prescribed threshold.SELECTED DRAWING: Figure 10
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Inventors:
FURUI KENJI
KIDOKORO TORU
OGISO MASATO
SHIRASAWA KEN
TAKAOKA KAZUYA
KIDOKORO TORU
OGISO MASATO
SHIRASAWA KEN
TAKAOKA KAZUYA
Application Number:
JP2017239728A
Publication Date:
June 27, 2019
Filing Date:
December 14, 2017
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F01N3/18; F01N3/08; F01N11/00; F02D45/00
Domestic Patent References:
| JP2015203322A | 2015-11-16 | |||
| JP2002129945A | 2002-05-09 |
Foreign References:
| US20150104363A1 | 2015-04-16 |
Attorney, Agent or Firm:
Akira Hirakawa
Takehiko Sekine
Katsuhiko Imahori
Fuminori Miyashita
Atsushi Kokubo
Hironobu Yazawa
Takehiko Sekine
Katsuhiko Imahori
Fuminori Miyashita
Atsushi Kokubo
Hironobu Yazawa