Title:
触媒劣化診断装置
Document Type and Number:
Japanese Patent JP7372440
Kind Code:
B2
Abstract:
Provided is a catalyst deterioration diagnostic device that is capable of detecting the degree of deterioration of a catalyst device with use of a single oxygen concentration sensor. The catalyst deterioration diagnostic device has: an oxygen concentration sensor (90) that is provided downstream of a catalyst (C) provided to an exhaust pipe (19) of an engine (E); and a control unit (100) that diagnoses the degree of deterioration of the catalyst (C) on the basis of an output signal of the oxygen concentration sensor (90). The catalyst deterioration diagnostic device is provided with: a perturbation means (105) for carrying out a perturbation process in which the air-fuel ratio of an air-fuel mixture fed to the engine (E) is alternately shifted toward target air-fuel ratios that are set on richer and leaner sides compared to a theoretical air-fuel ratio. During the perturbation process, the control unit (100) infers and detects the air-fuel ratio upstream of the catalyst (C) on the basis of the target air-fuel ratios and of the output signal of the oxygen concentration sensor (90).
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Inventors:
Shinji Fujita
Application Number:
JP2022504899A
Publication Date:
October 31, 2023
Filing Date:
March 05, 2020
Export Citation:
Assignee:
Honda motor industry stock company
International Classes:
F01N3/20; F02D33/00; F02D35/00; F02D45/00
Domestic Patent References:
| JP2007309244A | ||||
| JP814030A | ||||
| JP2007113528A | ||||
| JP2010159701A | ||||
| JP200598205A | ||||
| JP200230922A |
Foreign References:
| WO2017168580A1 |
Attorney, Agent or Firm:
Masayuki Shobayashi
Kazuyoshi Hayashi
Hiroaki Hoshino
Kiyotaka Sakamoto
Toshiji Tanabe
Kazuyoshi Hayashi
Hiroaki Hoshino
Kiyotaka Sakamoto
Toshiji Tanabe
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