Abstract: A fuel system for use in an internal combustion engine comprising a fuel pump having a pumping cycle during which fuel is pressurised to a high level within a pumping chamber for delivery to an injector. The injector is arranged to provide a primary fuel injection event, and a secondary fuel injection event within the same pumping cycle. The injector includes a valve needle which is engageable with a valve needle seating to control fuel delivery and an injection control valve arrangement for controlling movement of the valve needle so as to control the primary and secondary fuel injection events. The fuel system further comprises an accumulator volume for storing high pressure fuel for delivering the secondary fuel injection quantity, and additional valve arrangement for controlling the supply of fuel stored within the accumulator volume to the injector for the secondary injection event.

Abstract: A fuel system for use in an internal combustion engine comprising a fuel pump having a pumping cycle during which fuel is pressurised to a high level within a pumping chamber for delivery to an injector. The injector is arranged to provide a primary fuel injection event, and a secondary fuel injection event within the same pumping cycle, in use. The injector includes a valve needle which is engageable with a valve needle seating to control fuel delivery and an injection control valve arrangement for controlling movement of the valve needle so as to control the primary and secondary fuel injection events. The fuel system further comprises an accumulator volume for storing high pressure fuel for delivering the secondary fuel injection quantity, and additional valve arrangement for controlling the supply of fuel stored within the accumulator volume to the injector for the secondary injection event.

Abstract: A pumping apparatus for supplying fuel to an internal combustion engine has a high pressure pump, an adjustable throttle member which is utilized to control the fuel flow from a low pressure to the high pressure pump. An electromagnetic actuator is utilized to adjust the setting of the throttle member and a hydraulic damping device is provided to damp the movement of the throttle member.

Abstract: A fuel injection pumping apparatus for supplying fuel to an engine includes a high pressure pump which receives fuel from a low pressure pump by way of an angularly adjustable throttle member. The throttle member is connected to the armature of an electromagnetic actuator by means of a connecting rod. A transducer is provided which includes a core carried by the connecting rod intermediate the ends thereof and a pair of springs act to oppose the movement of the rod and throttle member by the actuator.

Abstract: A fuel pumping apparatus comprises a body housing a high pressure fuel pump to which fuel is supplied by an angularly adjustable throttle member from a low pressure pump. The throttle member mounts an arm and a hollow housing is provided which is secured to the body. A support carries an electromagnetic actuator the armature of which is connected at one end to a connecting rod the other end of which is connected to the arm. A transducer is mounted about and movable with the connecting rod. A clamp adjustably clamps the support within the housing and the clamp can be released to enable for a given axial setting of the connecting rod, the output of the apparatus to be adjusted.

Abstract: A liquid fuel injection pumping apparatus has a rotary distributor member in which is formed at least two bores which intersect and contain plungers. The plungers are moved inwardly by a cam and their ends are shaped to fit together so as to reduce the volume of fuel at their maximum extent. In order to maintain the alignment of the plungers each is provided with a slot which receives a disc-like member to maintain the relative alignment of the plungers throughout their stroke.