Delphi Technologies Holding S.arl

Delphi Technologies, Inc.

Andy Male

Anthony Thomas Harcombe

Malcolm David Dick Lambert

Andrew R Knight

Andrew J Limmer

Anthony John Williams

Ricardo Pimenta

Jonathan N Wray

A fuel injector comprising a nozzle having a nozzle needle which is moveable with respect to a first needle seat to control fuel delivery through a nozzle outlet. The injector includes a nozzle control valve for controlling fuel flow into a control chamber through a first passage to pressurise the control chamber, and for controlling fuel flow out of said control chamber through said first passage to depressurise the control chamber. Movement of the nozzle needle is controlled by fuel pressure within the control chamber, such that pressurising the control chamber causes the nozzle needle to be urged against the first needle seat to close the nozzle outlet, and depressurising the control chamber causes the nozzle needle to lift from the first needle seat to open the nozzle outlet. The nozzle needle defines, at least in part, a restricted passage through which fuel can flow into the control chamber as the control chamber depressurises. The fuel flow into the control chamber through the restricted passage serves to reduce the rate at which the control chamber depressurises, thereby reducing the rate at which the nozzle needle lifts from the first needle seat to open the nozzle outlet.

Fuel injector

A control valve arrangement for use in controlling fuel pressure within a control chamber () includes a control valve member () which is movable between a first position in which the control chamber () communicates with a source of high pressure fuel, and a second position in which the control chamber () communicates with a low pressure fuel drain and communication between the control chamber () and the source of high pressure fuel is broken. The control valve arrangement also includes restricted flow means () for restricting the rate of flow of fuel from the control chamber () to the low pressure fuel drain when the control valve member () is moved from the first position to the second position. It is desirable for the restricted flow means to be configured and arranged such the rate of flow of fuel from the source of high pressure fuel to the low pressure drain for the period of time for which the control valve member () is moving between the second position and the first position is also restricted.

Control valve arrangement

An accumulator fuel system for an internal combustion engine having a plurality of engine cylinders, includes an accumulator fuel volume () for supplying high pressure fuel to one or more of a plurality of injectors () of the fuel system, each of which is arranged to supply fuel to an associated one of the engine cylinders. The accumulator fuel volume () is integrated within an engine component, where the engine component provides a purpose other than that solely of an accumulator volume for storing high pressure fuel. For example, the accumulator volume () is defined in one embodiment within a rocker shaft () of the engine and in another embodiment within the engine cylinder head ().

Accumulator fuel system

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Walton on Thames, United Kingdom

Andy Male