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. 29, 2005
Filed:
Oct. 04, 2004
Toshiaki Date, Tokyo, JP;
Takahiko Oono, Hyogo, JP;
Toshiaki Date, Tokyo, JP;
Takahiko Oono, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
Apparatus for diagnosing high pressure fuel system of a cylinder injection type engine includes fuel pump (), spill valve (), fuel injectors (), fuel pressure sensor () and fuel pressure control means (). A control period for the pump () covers an intake period and a discharge period. The discharge period covers spill valve closing period and spill valve opening period. Fuel pressure control means () includes spill valve control period setting means for adjusting spill valve closing/opening periods, abnormality decision period detecting means for detecting as abnormality decision period the spill valve opening period during the discharge period in the engine operation, pressure change arithmetic means for determining change of the fuel pressure (PF) on the basis of the abnormality decision period, and diagnosing means for deciding as to abnormality of the spill valve (), based on the change of the fuel pressure (PF).