Title:
蒸発燃料処理装置の故障診断装置
Document Type and Number:
Japanese Patent JP3577985
Kind Code:
B2
Abstract:
A system for diagnosing evaporation control system failures repeatedly introduces pressure, positive or negative, into the evaporation control system (29, 34, 30, 31, 32, 32a, 33, 35) and closes up it hermetically a plurality of times (for example two times), and detects changes in internal pressure in the evaporation control system. An average value of the internal pressure changes is compared to a threshold value so as to judge whether there is leakage of fuel vapors of the evaporation control system. When a difference between the internal pressure change is greater than a specified value, the evaporation control system failure diagnosis is interrupted.
Inventors:
Shingo Shigehama
Katsuhiko Sakamoto
Yuuji Oota
Tetsushi Hosogai
Katsuhiko Sakamoto
Yuuji Oota
Tetsushi Hosogai
Application Number:
JP8608799A
Publication Date:
October 20, 2004
Filing Date:
March 29, 1999
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
F02D41/00; F02M25/08; G01M3/26; G01M15/04; (IPC1-7): F02M25/08; G01M3/26; G01M15/00
Domestic Patent References:
| JP2000227052A |
Attorney, Agent or Firm:
Minoru Murata