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Title:
パティキュレートフィルタの異常判定方法および異常判定装置
Document Type and Number:
Japanese Patent JP7194360
Kind Code:
B2
Abstract:
To prevent such a situation that a particulate filter is erroneously determined as abnormal when fuel is cut.SOLUTION: A differential pressure on upstream and downstream sides of GPF (particulate filter) 33 is detected by a pressure sensor 35. For the detected differential pressure, a weight value is determined from a weight characteristic set according to an engine operation state, and its integrated value is calculated. A weight differential pressure obtained by weighing the detected differential pressure by the weight value is calculated, and its integrated value is calculated. When the integrated value of the weight value becomes not less than a preset and predetermined value, by comparing an average travelling value of the weight differential pressure with a preset determination threshold, abnormality of the GPF 33 is determined. When the fuel is cut, the integrated value is reduced (for example, reset to 0).SELECTED DRAWING: Figure 12

Inventors:
Hiroshi Yoshida
Takayuki Araki
Shinichi Kure
Tomokuni Kusunoki
Application Number:
JP2019081460A
Publication Date:
December 22, 2022
Filing Date:
April 23, 2019
Export Citation:
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Assignee:
Mazda Corporation Inc
International Classes:
F01N3/18; B01D46/42; F01N3/023
Domestic Patent References:
JP2009216077A
JP201552291A
JP2006257881A
JP200875571A
JP20082309A
Foreign References:
US20100242449
WO2009139218A1
WO2015093603A1
Attorney, Agent or Firm:
Murata Minoru
Yoshitaka Funase
Kiyotaka Totsuka