Lucas Industries Limited

Delphi Technologies Holding S.arl

Stephen Anthony Noyce

Martin Paul Hardy

Daniel Jeremy Hopley

Colin Almond

A method of operating a fuel injector having a piezoelectric actuator operable by applying a drive pulse thereto, wherein the drive pulse has a frequency domain signature. The method includes i) determining at least one resonant frequency of an injector installation in which the injector is received, in use, and ii) modifying the drive pulse such that a maximum of the frequency domain signature thereof is remote from the determined resonant frequency of the injector installation.

Method of operating a fuel injector

A fuel injector comprises a valve needle biased by a spring towards a seating. The spring engages a spring abutment member which is moveable with a piston member. The spring abutment member defines, with a member carried by the needle, a damping chamber which communicates through a restricted passage with a low pressure drain to damp movement of the needle relative to the piston member.

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Poole, United Kingdom

Stephen Anthony Noyce