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:
Aug. 27, 2013
Filed:
Jul. 27, 2010
James Sinclair, Perivale, GB;
James Sinclair, Perivale, GB;
Delphi Technologies Holding S.arl, Luxembourg, LU;
Abstract
A method and apparatus for controlling a fuel pump assembly comprising a plurality of pump elements, each pump element comprising a cam-driven plunger to perform at least one pumping event per engine revolution and a control valve. Each pumping event corresponds to an associated cam lobe of the associated cam. The method comprises, for each pumping event of each pump element, controlling the control valve of said pump element in response to an output control signal derived from at least one previous pumping event. Fuel pressure is measured within a rail volume and compared with a demanded rail pressure value to derive a rail pressure error. A proportional term and an integral term for the rail pressure error are derived and combined to derive the output control signal. Monitoring of the integral term for each pumping event provides a means for identifying and diagnosing a fault condition.