Abstract: An injector mounting arrangement for use in an engine, the injector mounting arrangement including: a fuel injector having one or more resonant modes of vibration, an engine cylinder housing, and a clamping arrangement including a clamping member for applying a clamping load to the injector so as to clamp the injector to the cylinder housing wherein the clamping load is applied at or substantially at a vibration node of one of the one or more modes of vibration of the fuel injector so as to damp or substantially prevent transmission of injector generated noise to the cylinder housing.

Abstract: A method of operating a fuel injector including a piezoelectric actuator having a stack of piezoelectric elements, comprises applying a discharge current (IDISCHARGE) to the actuator for a discharge period so to discharge the stack from a first differential voltage level across the stack to a second, lower differential voltage level across the stack so as to initiate an injection event, and applying a charge current (ICHARGE) to the actuator for a charge period (T3 to T4?) so as to charge the stack from the second differential voltage level to a third differential voltage level so as to terminate the injection event. The method includes determining at least one engine parameter (e.g. common rail pressure) of the injection event prior to applying the charge current (ICHARGE) to the actuator and selecting the third differential voltage level in dependence on the at least one engine parameter.

Abstract: An injector mounting arrangement for use in an engine, the injector mounting arrangement including: a fuel injector having one or more resonant modes of vibration, an engine cylinder housing, and a clamping arrangement including a clamping member for applying a clamping load to the injector so as to clamp the injector to the cylinder housing wherein the clamping load is applied at or substantially at a vibration node of one of the one or more modes of vibration of the fuel injector so as to damp or substantially prevent transmission of injector generated noise to the cylinder housing.

Abstract: The present invention embodies a fuel injector that takes up limited space when installed on the cylinder head of an associated engine. According to the invention in a fuel injection nozzle of the kind specified the wider portion of the nozzle body is provided with a slot which extends from the step toward the nozzle holder, the portion of the nozzle holder adjecent the nozzle body being provided with a slot. A chip member located in the slot secures the collar to the nozzle holder to retain the nozzle body relative to the nozzle holder.

Abstract: A fuel injection nozzle of the inwardly opening type has an axially movable valve member engageable under the action of a spring, with a seating to prevent fuel flow through an outlet. The valve member engaged by a spring abutment and is slidable within a sleeve and when fuel under pressure is supplied to the nozzle forces are developed on the valve member and the sleeve which is urged into contact with a part located between the sleeve and the spring abutment. A leakage path is provided to prevent a build up of fuel pressure within an annular zone defined between the part and the valve member.