Control method for a direct injection system of the common-rail type provided with a shut-off valve for controlling the flow rate of a high-pressure fuel pump

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Abstract

A control method of a direct injection system (1) of the common-rail type; the control method contemplates: feeding the pressurized fuel to a common rail (5) by means of a high-pressure pump (6) which receives the fuel through a shut-off valve (24); cyclically controlling the opening and closing of the shut-off valve (24) for choking the flow rate of fuel taken in by the high-pressure pump (6); driving the shut-off valve (24) synchronously with respect to the mechanical actuation of the high-pressure pump (6) by means of a driving frequency of the shut-off valve (24) having a constant integer synchronization ratio, predetermined according to the pumping frequency of the high-pressure pump (6); estimating a perturbation intensity (I) of the fuel pressure inside the common rail (5); and varying the phase of the commands of the shut-off valve (24) with respect to the phase of the mechanical actuation of the high-pressure pump (6) if the perturbation intensity (I) of the fuel pressure inside the common rail (5) is higher than a predetermined threshold value.

Classe Tecnologica

F - Mechanical engineering, lighting, heating, weapons, blasting

Patent Office

United States Patent and Trademark Office

Numero Deposito

US7699040

Anno Deposito

2008

Anno Concessione

2010

Inventori Pugliesi

  • De Cesare Matteo

Tutti gli inventori

  • Gabriele Serra
  • Matteo De Cesare

Titolari pugliesi

  • Non ci sono titolari pugliesi

Tutti i titolari

  • Magneti Marelli S.p.A.