Abstract: A generator controller (4) is provided which is able to detect and respond to failure of a generator output voltage sensor, whilst being able to distinguish voltage sensor failure from output voltage collapse due to the presence of an overload or short circuit condition. The presence of a voltage sensor failure is indicated by the measured output voltage being below a first voltage threshold whilst the output current is also below a current threshold.

Abstract: A drive disconnect mechanism is provided where a drive transfer element 12 can be moved to a disconnect position by a hydraulic actuator which itself is controlled by an electrically operated valve.

Abstract: A clamp pressure controller for a variable ratio belt drive system for a generator is provided. The controller monitors the voltage at the output of the generator. If this falls the controller increases the clamp pressure so as to prepare the drive system for the additional torque/force it will be required to transmit. The increase in clamp pressure is rapid so as to prevent belt slip from occurring.

Abstract: An apparatus for determining the statues of a shut-off valve arrangement forming part of a fuelling system of an engine comprises a metering valve arrangement comprising a metering valve member for regulating fuel flow from a pump to the engine and a position sensor for monitoring the position of the metering valve member. The shut-off valve arrangement is operable between open and closed positions and the metering valve arrangement is operable between a maximum flow position, in which the flow of fuel through the metering valve arrangement to the shut-off valve arrangement is a maximum, and a minimum flow position in which the flow of fuel through the metering valve arrangement to the shut-off valve arrangement is a minimum. The position of the metering valve member is controlled by controlling fuel pressure acting on the metering valve member.

Abstract: A method and apparatus are provided in which control data for a generator system is multiplexed onto a synchronisation signal.

Abstract: A disconnect device is provided in which input and output elements 2 and 4 axially overlap and are drivingly interconnected by balls 14 which extend from a recess the radially innermost element into a channel in the radially outermost element. The balls are held in position by a keeper 16 which is axially movable to release the balls and disconnect the drive.

Abstract: A rotor is provided for use at high speed. The rotor comprises a stack of laminations held under compression between opposed flanges. The laminations have a plurality of teeth. Some of the laminations have lugs having passages formed therein through which the bolts that hold the stack in compression pass. The laminations serve to hold bolts against radial deformation at high speed.

Abstract: A pump system is provided where low pressure (4) and high pressure (6) pumps are coaxially mounted to receive motive power from a shared drive (300). The drive shafts are arranged such that one extends within a void in the other and both have shear regions such that, in the event of torque overload, either shaft can shear so as to disconnect the drive to it's associated pump while the other pump and shaft can continue to work.

Abstract: A drive disconnect device is provided in which input and output shafts are provided in splined engagement. The splines are aligned with the axes of the input and output shafts such that the force acting between the shafts in a separating direction is substantially invariant of the torque being transmitted. The shafts are spring biased to a disengaged position. The biasing force is resisted by a meltable restraining element which is arranged to melt when the temperature exceeds an acceptable value so as to allow the spring to cause the shafts to disengage from one another.