The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 17, 2006
Filed:
Nov. 13, 2003
Tateki Mitani, Chiyoda-Ku, JP;
Seiji Tsutsui, Chiyoda-Ku, JP;
Shigeki Kanamaru, Chiyoda-Ku, JP;
Hiroshi Yoshioka, Chiyoda-Ku, JP;
Tateki Mitani, Chiyoda-Ku, JP;
Seiji Tsutsui, Chiyoda-Ku, JP;
Shigeki Kanamaru, Chiyoda-Ku, JP;
Hiroshi Yoshioka, Chiyoda-Ku, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An apparatus for detecting fuel-vapor gas leaks that includes a jet pump () that introduces outside air into and pressurizes a vapor purge system including a fuel tank () by gasoline flow from a fuel pump (); an internal pressure sensor () for measuring vapor purge system internal pressure, an open/close controllable reference orifice () that causes leakage through a reference leak hole; and a storage device for storing as an initial curve pressure changes during pressurization by the jet pump () for a predetermined time period, with the reference orifice () alone opened. The device can accurately detect leakage even while an internal combustion engine is running because it judges leak presence/absence by comparing a time series in a pressure curve obtained by jet pump () pressurization over the predetermined time period while idling with the vapor purge system completely shut-off, with a time series in the initial curve.