Fuel-injection system for an internal-combustion engine and corresponding method for controlling fuel injection

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Abstract

A fuel-injection system in an internal-combustion engine is provided with an electroinjector (1) comprising an injection nozzle (5), and a needle (7) mobile along an opening stroke and a closing stroke for opening/closing the nozzle (5) under the control of an electroactuator device (8). The opening stroke of the needle (7) is controlled by a rod (14) pushed by the pressure of the fuel in a control chamber (15), in such a way as to keep the needle (7) normally in the position for closing the nozzle (5). The control chamber (15) is equipped with an inlet duct (18) having a pre-set diameter (D 4 ) and with an outlet passage (24) having a diameter (D 5 ) and controlled by a control valve (16). The method for controlling fuel injection comprises the steps of choosing the ratio (D 5 /D 4 ) of the aforesaid diameters so as to determine a certain rate of displacement of the needle (7), and issuing to the device (8) a first electrical command (C 1 ) and a second electrical command (C 2 ) sufficiently close to one another to displace the needle (7) with a profile of motion (P) without any discontinuities in time.

Classe Tecnologica

B - Performing operations, transporting

Patent Office

United States Patent and Trademark Office

Numero Deposito

US7240859

Anno Deposito

2005

Anno Concessione

2006

Inventori Pugliesi

  • Ricco Mario
  • De Matthaeis Sisto Luigi
  • Gravina Antonio
  • Stucchi Sergio

Tutti gli inventori

  • Ricco Mario
  • De Matthaeis Sisto Luigi
  • Gravina Antonio
  • Stucchi Sergio

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  • C.R.F. Società Consortile Per Azioni