Title:
空燃比センサの異常検出装置
Document Type and Number:
Japanese Patent JP4135563
Kind Code:
B2
Abstract:
A novel abnormality detection device for an air-fuel ratio sensor able to more accurately detect an abnormality, provided with an air-fuel ratio sensor arranged in an exhaust passage of an internal combustion engine for detecting an air-fuel ratio based on a current generated in accordance with a concentration of oxygen in the exhaust gas along with application of voltage and an air-fuel ratio sensor activating means for activating the air-fuel ratio sensor, wherein the activity of the air-fuel ratio sensor is maintained even after the internal combustion engine is stopped and an abnormality of the air-fuel ratio sensor is detected based on an output of the air-fuel ratio sensor upon and/or after the elapse of a first predetermined time after the internal combustion engine is stopped.
Inventors:
Kazutaka Hattori
Application Number:
JP2003159570A
Publication Date:
August 20, 2008
Filing Date:
June 04, 2003
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F02D45/00; F01N13/00; F01N99/00; F02D41/04; F02D41/14; F02D41/22; G01M99/00; G01N7/00; G01N21/00; G01N27/417
Domestic Patent References:
| JP2003247452A | ||||
| JP10169500A | ||||
| JP10159640A | ||||
| JP8177575A | ||||
| JP2001241346A | ||||
| JP2003020989A | ||||
| JP11107830A |
Attorney, Agent or Firm:
Takashi Ishida
Jun Tsuruta
Shinji Mitsuhashi
Masaya Nishiyama
Jun Tsuruta
Shinji Mitsuhashi
Masaya Nishiyama