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:
Oct. 31, 2000
Filed:
Sep. 01, 1998
Koji Morikawa, Higashikurume, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo-To, JP;
Abstract
A system for controlling an in-cylinder fuel injection engine determines that a high-pressure fuel system is abnormal, when meeting at least one of conditions that the fuel pressure Pf of the high-pressure fuel system does not reach a preset pressure PFS (S24) even if a predetermined period of time elapses after the engine start-up (S22), that the fuel pressure Pf of the high-pressure fuel system is not within an ordinary fuel pressure range defined by the lower limit PFL and the upper limit PFH after the engine start-up (S27, S28), and that the fuel injection pulse width Ti continues to exceed the upper limit TiNGMAX, which can not usually be obtained, for a predetermined period of time at a lean air-fuel ratio (S30.about.S33). Thus, the abnormality of the high-pressure fuel system of the in-cylinder fuel injection engine can be accurately diagnosed.