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:
Jul. 10, 2007
Filed:
Mar. 29, 2006
Mario Ricco, Casamassima, IT;
Sisto Luigi DE Matthaeis, Valenzano, IT;
Antonio Gravina, Valenzano, IT;
Sergio Stucchi, Valenzano, IT;
Mario Ricco, Casamassima, IT;
Sisto Luigi De Matthaeis, Valenzano, IT;
Antonio Gravina, Valenzano, IT;
Sergio Stucchi, Valenzano, IT;
CRF Societa Consortile Per Azioni, Orbassano, Strada Torino, IT;
Abstract
A fuel-injection system in an internal-combustion engine is provided with an electroinjector () comprising an injection nozzle (), and a needle () mobile along an opening stroke and a closing stroke for opening/closing the nozzle () under the control of an electroactuator device (). The opening stroke of the needle () is controlled by a rod () pushed by the pressure of the fuel in a control chamber (), in such a way as to keep the needle () normally in the position for closing the nozzle (). The control chamber () is equipped with an inlet duct () having a pre-set diameter (D) and with an outlet passage () having a diameter (D) and controlled by a control valve (). The method for controlling fuel injection comprises the steps of choosing the ratio (D/D) of the aforesaid diameters so as to determine a certain rate of displacement of the needle (), and issuing to the device () a first electrical command (C) and a second electrical command (C) sufficiently close to one another to displace the needle () with a profile of motion (P) without any discontinuities in time.