Title:
燃料蒸気処理システムの異常判定装置
Document Type and Number:
Japanese Patent JP4643477
Kind Code:
B2
Abstract:
An abnormality determining apparatus of a fuel vapor processing system is provided. The system includes a canister for temporarily reserves fuel vapor generated within a fuel tank and a fuel vapor path for discharging the fuel vapor to an engine intake passage. When it is determined that there is a leak abnormality in the fuel vapor path, a pump is operated to discharge air from the fuel vapor path to the outside through the canister. When the pump is operated, a detector detects a pressure in the fuel vapor path as an actually measured pressure. A determining section determines whether there is a leak abnormality. The determining section sets a first determination pressure and a second determination pressure that is higher than the first determination pressure. The determining section determines that there is no leak abnormality either when a first condition is met or when a second condition is met. The first condition indicates that the actually measured pressure is less than or equal to the first determination pressure, and the second condition indicates that the actual measured pressure when changes due to the operation of the pump have subsided is less than or equal to the second determination pressure. The determining section determines that there is a leak abnormality when none of the first condition nor the second condition is met.
Inventors:
Hideki Miyahara
Application Number:
JP2006070864A
Publication Date:
March 02, 2011
Filing Date:
March 15, 2006
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F02M25/08; G01M99/00
Domestic Patent References:
| JP2004301027A | ||||
| JP2005299558A |
Attorney, Agent or Firm:
Hironobu Onda
Makoto Onda
Makoto Onda