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. 25, 2008
Filed:
Aug. 22, 2006
Keiji Ohshima, Gamagori, JP;
Keiji Ohshima, Gamagori, JP;
Denso Corporation, Kariya-city, Aichi-pref., JP;
Abstract
In a common rail fuel injection system, a fuel pump pressure-feeds fuel to a common rail, which accumulates the fuel at high pressure corresponding to fuel injection pressure. An electronic control unit (ECU) drives and controls a suction control valve provided in the fuel pump to regulate a pressure-feeding amount of the fuel and to perform fuel pressure feedback control. The ECU calculates a differential term of a control amount of the suction control valve based on a pressure deviation of the fuel pressure in the common rail with respect to target pressure. The ECU sets the differential term at zero when the fuel pressure is higher than the target pressure and the differential term of the control amount is a value for pressure-feeding the fuel.