Magneti Marelli S.p.a.

Marelli Europe S.p.a.

Riccardo Marianello

Luca Mancini

Paolo Pasquali

Armando Spizzirri

Stefano Petrecchia

Michele Petrone

A valve assembly for a fuel pump and having: a one-way outlet closing valve, which only allows fuel to flow out; a one-way pressure relief valve, which only allows fuel to flow in; a connector, which has a housing on the inside; and a valve disc, which engages the housing of the connector and has a plurality of through outlet holes and a through relief hole. A shutter of the outlet closing valve consists of a flexible sheet, which is fixed to the valve disc and has: a plurality of shutting portions arranged in the area of the outlet holes; a peripheral mounting portion with an annular shape; a plurality of outer connection portions, each connecting the peripheral mounting portion to a corresponding shutting portion; a central mounting portion; and a plurality of inner connection portions, each connecting the central mounting portion to a corresponding shutting portion.

Fuel pump for a direct injection system

A method to control a fuel pump for a direct injection system provided with a common rail comprising the steps of calculating the objective fuel flow rate to be fed by the high pressure pump to the common rail instant by instant to have the desired pressure value inside the common rail; comparing the objective fuel flow rate with the maximum flow rate that can be delivered by the high pressure pump; and, based on the comparison between the objective fuel flow rate and the maximum flow rate that can be delivered by the high pressure pump, controlling the high pressure pump so as to alternate operating cycles of the high pressure pump with the maximum flow rate that can be delivered and idle operating cycles of the high pressure pump.

Method to control a fuel pump for a direct injection system

A fuel pump for a direct-injection system provided with a common rail comprises a pumping chamber defined in a main body. A piston is mounted in a sliding manner inside the pumping chamber to cyclically vary volume of the pumping chamber. A suction channel is connected to the pumping chamber and regulated by a suction valve. A delivery channel is connected to the pumping chamber and regulated by a delivery valve. A flow-rate-adjustment device is mechanically coupled to the suction valve to keep, when necessary, the suction valve substantially open during pumping of the piston and includes a control rod that is coupled to the suction valve and an electromagnetic actuator that acts on the control rod and has a one-way hydraulic brake that is integral to and substantially slows movement of the control rod.

Growing community of inventors

Monte San Pietro, Italy

Riccardo Marianello