Title:
ガスセンサの異常診断方法、ガスセンサの異常診断装置
Document Type and Number:
Japanese Patent JP4802116
Kind Code:
B2
Abstract:
A gas sensor diagnostic method includes the steps of counting the reversal number of times that a target air-fuel ratio for an air-fuel mixture to be supplied to an internal combustion engine reverses from a rich side to a lean side or from the lean side to the rich side through a specific air-fuel ratio defined as a boundary of the rich and lean sides; obtaining a detection signal of a gas sensor at constant time intervals during a diagnosis period between a timing when the count for the reversal number is started and a timing when the reversal number reaches a predetermined number; calculating a moderated signal by applying a moderation calculation using a predetermined moderation coefficient to the obtained detection signal; calculating a deviation between the obtained detection signal and the calculated moderated signal; and determining whether the gas sensor is in an abnormal state or not on the basis of the deviation.
Inventors:
Rena Kitou
Norikazu Ieda
Masayasu Tanaka
Hiroshi Inagaki
Masaki Hirata
Takahiro Suzuki
Norikazu Ieda
Masayasu Tanaka
Hiroshi Inagaki
Masaki Hirata
Takahiro Suzuki
Application Number:
JP2007040937A
Publication Date:
October 26, 2011
Filing Date:
February 21, 2007
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
SUZUKI KABUSHIKI KAISHA
SUZUKI KABUSHIKI KAISHA
International Classes:
G01N27/26; G01N27/419
Domestic Patent References:
| JP10169494A | ||||
| JP8285808A | ||||
| JP4365950A |
Attorney, Agent or Firm:
Hisashi Yamamoto