Abstract: A fuel injection system for an internal combustion engine includes an injector having a first orifice to which is tightly connected a pipe having a matching first orifice. Both orifices are surrounded with peripheral smooth surfaces that are complementary surfaces sealingly pressed against each other by a clamping plate.

Abstract: A filter for a control flow of a fuel injector, wherein a primary fuel flow enters the injector through an inlet aperture, and wherein part of the primary fuel flow forms a secondary fuel flow which enters a control valve through a control flow aperture, wherein the filter is located such that only the secondary flow of fuel passes through the filter, the filter includes filter orifices such as slots, holes or perforations, wherein at least one dimension of the filter orifices is less than the nozzle control valve lift value.

Abstract: A fuel injection system for an internal combustion engine includes an injector having a first orifice to which is tightly connected a pipe having a matching first orifice. Both orifices are surrounded with peripheral smooth surfaces that are complementary surfaces sealingly pressed against each other by a clamping plate.

Abstract: A fuel injection apparatus for an internal combustion engine includes a fuel supply passage and a valve arrangement for controlling fuel pressure within the fuel supply passage. The valve arrangement includes a valve member movable between an open position in which the fuel supply passage communicates with a low pressure fuel drain and a closed position in which communication between the fuel supply passage and the low pressure fuel drain is prevented. The valve arrangement comprises damping means for controlling and/or damping movement of the valve member between the closed and open positions.

Abstract: A fuel injection apparatus for an internal combustion engine includes a fuel supply passage (16) and a valve arrangement for controlling fuel pressure within the fuel supply passage. The valve arrangement includes a valve member (46) movable between an open position in which the fuel supply passage (16) communicates with a low pressure fuel drain and a closed position in which communication between the fuel supply passage (16) and the low pressure fuel drain is prevented. The valve arrangement comprises damping means (51, 52) for controlling and/or damping movement of the valve member between the closed and open positions.

Abstract: A fuel injection system for supplying pressurized fuel to a fuel injector, the fuel injection system comprising an accumulator volume for supplying fuel at a first injectable pressure level to the fuel injector through a fuel supply passage, a pump arrangement for increasing the pressure of fuel supplied to the injector to a second injectable pressure level, and a valve arrangement operable between a first position in which fuel at the first injectable pressure level is supplied to the injector and a second position in which communication between the injector and the accumulator volume is broken so as to permit fuel at the second injectable pressure to be supplied to the injector. The injection system may include a valve arrangement in the form of a three-position valve or may include a shut off valve for controlling the supply of fuel through the fuel supply passage.

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 fuel injection system for supplying pressurised fuel to a fuel injector, the fuel injection system comprising an accumulator volume for supplying fuel at a first injectable pressure level to the fuel injector through a fuel supply passage, a pump arrangement for increasing the pressure of fuel supplied to the injector to a second injectable pressure level, and a valve arrangement operable between a first position in which fuel at the first injectable pressure level is supplied to the injector and a second position in which communication between the injector and the accumulator volume is broken so as to permit fuel at the second injectable pressure to be supplied to the injector. The injection system may include a valve arrangement in the form of a three-position valve or may include a shut off valve for controlling the supply of fuel through the fuel supply passage.