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:
Feb. 19, 2008
Filed:
Jan. 16, 2007
Yoshihiro Okuda, Kariya, JP;
Yoshihiro Okuda, Kariya, JP;
Denso Corporation, Kariya, Aichi-pref., JP;
Abstract
A fuel vapor treatment system includes a three-position valve for switching between a first measuring state and a second measuring state, and a pressure sensor for measuring pressure produced by a restriction in a measurement line. In the first measuring state, air flows through the measurement line. In the second measuring state, air-fuel mixture flows through the measurement line. The behavior of change in a first pressure in the first measuring state and the behavior of change in a second pressure in the second measuring state are measured. When that the behaviors of change in the first and second pressures are substantially identical to each other, it is determined that an abnormality occurs in an operation of switching the three-position valve.