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:
Jun. 03, 1997
Filed:
Mar. 12, 1996
Tomohiro Fujita, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
In the present invention, the fuel injection amount of the engine is determined by an air-fuel ratio feedback correction factor FAF and a feedback learning correction factor KG and a fuel vapor learning correction factor FGPG. When the fuel vapor is supplied to the engine, the value of FGPG is adjusted so that the center value of the fluctuation of FAF agrees with 1.0 while the value of KG is held at the value before the fuel vapor supply started. On the other hand, when the fuel vapor is not supplied to the engine, the value of KG is adjusted so that the center value of the fluctuation of FAF agrees with 1.0 while the value of FGPG is set at 0. Therefore, the value (FAF+KG) indicates whether a failure has occurred in the fuel supply system regardless of the fuel vapor supply to the engine. Further, if the value (FAF+KG) becomes larger than or smaller than a predetermined range when the fuel vapor is supplied to the engine, i.e., if it is determined that the fuel supply system has failed when the fuel vapor is supplied to the engine, the fuel vapor supply is stopped, and determination whether the value (FAF+KG) is larger than or smaller than a predetermined range, is carried out again after the fuel vapor supply has been stopped. Therefore, an error in failure detection can be eliminated.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile