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:
Dec. 28, 2010
Filed:
May. 21, 2007
Martin Sykes, Rainham, GB;
Joseph Walsh, Kineton, GB;
Daniel Hopley, Chislehurst, GB;
Peter Griffin, Maidstone, GB;
Martin Sykes, Rainham, GB;
Joseph Walsh, Kineton, GB;
Daniel Hopley, Chislehurst, GB;
Peter Griffin, Maidstone, GB;
Delphi Technologies Holding S.arl, Troy, MI (US);
Abstract
A method for controlling the displacement of a stack of a piezoelectric actuator for use in a fuel injector comprises determining a desired amount of charge (ΔQ) to be added or removed from the stack. The method further comprises determining an operating parameter of the fuel system and selecting a drive current level (PO, SO) and a drive time (t, t) in accordance with the desired amount of charge (ΔQ) and the operating parameter, and driving the drive current through the stack for the drive time (t, t) in order to add or remove the desired amount of charge (ΔQ).