Title:
蒸発燃料処理装置のリーク診断装置
Document Type and Number:
Japanese Patent JP4556667
Kind Code:
B2
Abstract:
A fuel vapor purge system is configured to execute a highly accurate leak diagnosis with respect to a fuel vapor leak. After the engine is stopped, the temperature of the fuel vapor rises temporarily and then decreases until it reaches the outside ambient temperature. During this period, the purge line is closed off and a purge line pressure decreasing rate is detected when the purge line pressure is slightly above atmospheric pressure. The detected purge line pressure decreasing rate is then compared to a threshold value. The purge system is diagnosed as "normal" if the purge line pressure decreasing rate is equal to or larger than the threshold value and as "leaking" if the purge line pressure decreasing rate is less than the threshold value.
Inventors:
Takeshi Rouki
Takane Hayashi
Yuya Ishii
Takane Hayashi
Yuya Ishii
Application Number:
JP2004376925A
Publication Date:
October 06, 2010
Filing Date:
December 27, 2004
Export Citation:
Assignee:
Nissan Motor Co., Ltd
International Classes:
F02M25/08; G01M99/00; G01M3/02; G01M3/26
Domestic Patent References:
| JP2003035215A | ||||
| JP2003328865A | ||||
| JP2003056416A |
Attorney, Agent or Firm:
Masaki Goto
Masahiro Fujii
Yasunari Mita
Masaaki Iida
Masahiro Fujii
Yasunari Mita
Masaaki Iida