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:
Mar. 03, 1998
Filed:
Jun. 03, 1996
Makoto Miwa, Kariya, JP;
Naoki Yoshiume, Kariya, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
In a fuel supply system for an internal combustion engine, a feedback correction amount relative to a reference control value for a fuel pump is derived based on a deviation between an actual fuel pressure detected by a pressure sensor and a target fuel pressure. Since the feedback correction amount is controlled to be around zero during normal operation of the system, it is checked whether the feedback correction amount is within a given range. If negative, an occurrence of abnormality in the system is determined when a residual fuel amount in a fuel tank is no less than a criterion value and further when a vehicle is not running on a rough road. When the occurrence of abnormality is determined, a failure flag is set to ON while a failure determination enabling flag is reset to OFF so as to prohibit execution of a given other failure determination process such as a misfire detection process.