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:
Apr. 28, 2009
Filed:
Sep. 23, 2004
Steven J Martin, Canterbury, GB;
Steven J Martin, Canterbury, GB;
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A drive circuit () for an injector arrangement having at least one piezoelectric injector () is described. The drive circuit comprises: a first charge storage means (C) for operative connection with the injector () during a discharging phase so as to discharge current to flow therethrough, thereby to initiate an injection event; a second charge storage means (C) for operative connection with the injector () during a charging phase so as to cause a charging current to flow therethrough, thereby to terminate the injection event; a switch means (QQ) for controlling whether the first charge storage means (C) is operably connected to the injector or whether the second charge storage means (C) is operably connected to the injector; a first voltage supply rail at a first voltage level; a second voltage supply rail at a second voltage level higher than the first; a voltage supply means (); and regeneration switch means (QQL) operable at the end of the charging phase to transfer charge from the voltage supply means to at least the second charge storage means (C) via an energy storage device (L) prior to a subsequent discharging phase.