Abstract: A fuel injection system for an internal combustion engine is provided for providing an injection event including a first stage and a second stage via a single nozzle. The nozzle is connected by its inlet port to a source of variable fuel pressure and it includes a needle valve for performing the first stage of injection, and a poppet valve for performing the second stage of injection. The first and second stages of injection are selectable by controlling the fuel pressure in the inlet port which is common for both the needle valve and the poppet valve.

Abstract: A fuel injection system for an internal combustion engine includes an engine management system, a return conduit connected to a low-pressure fuel system, and a common rail for storing and supplying a relatively high-pressure fuel to injectors. Each injector has a nozzle for injecting fuel into the engine, a valve installed between the common rail and the nozzle, and a spill valve connected by its inlet to the outlet of the valve and by its outlet to the return conduit. A first automatic isolating valve is installed between the common rail and the injector and a second automatic isolating valve is installed between the return conduit and the low-pressure fuel system.

Abstract: The invention relates to an internal combustion engine with a fuel injection system. The injection system comprises a source (1) of pressurized fuel positioned outside an oil-wetted space (2) of an engine (4) and a fuel injector (5) positioned within Go said space (2). An engine component (7) that is a part of an engine system other than the fuel injection system is attached to the engine outside the oil-wetted space (2) by means of a fastener (9). The fastener (9) is provided with an internal passage forming part of a hydraulic communication between the source (1) of pressurized fuel and the injector (5).

Abstract: A valve actuation system for providing added motion in the valve mechanism of an internal combustion engine with at least one inlet valve and at least one exhaust valve is provided. The valve mechanism includes a rotatable camshaft including rising and falling ramps designed to interact with a valve control plunger inside a cylinder for actuation of the inlet or exhaust valve under the action of a valve spring. The cylinder communicates with a hydraulic fluid feed line via a check valve and with a hydraulic control circuit allowing a return movement of a valve to be delayed in relation to the timing of the corresponding falling ramp. The hydraulic control circuit includes a first and a second hydraulic fluid flow restrictor connected to the control plunger cylinder at different levels along its longitudinal axis. A selector valve enables a connection between the cylinder and hydraulic fluid return line to be opened via either one only or both flow restrictors.

Abstract: A valve actuation system for providing added motion in the valve mechanism of an internal combustion engine with at least one inlet valve and at least one exhaust valve is provided. The valve mechanism includes a rotatable camshaft including rising and falling ramps designed to interact with a valve control plunger inside a cylinder for actuation of the inlet or exhaust valve under the action of a valve spring. The cylinder communicates with a hydraulic fluid feed line via a check valve and with a hydraulic control circuit allowing a return movement of a valve to be delayed in relation to the timing of the corresponding falling ramp. The hydraulic control circuit includes a first and a second hydraulic fluid flow restrictor connected to the control plunger cylinder at different levels along its longitudinal axis. A selector valve enables a connection between the cylinder and hydraulic fluid return line to be opened via either one only or both flow restrictors.

Abstract: A fuel injection system for an internal combustion system includes an Engine Management System (EMS), a fuel feed pump, a return line, a high-pressure pump, supplying fuel under pressure to a common rail, a hydraulically operated valve forming an outlet chamber connected to the common rail and a control chamber, the valve being designed such that, in its closed position, the valve prevents the flow out of the outlet chamber, and an electrically operated pilot valve. A nozzle with a resilient member that biases the nozzle towards closing is connected to the outlet of the hydraulically operated valve in such a way that pressure at the outlet of the hydraulically operated valve tends to overcome the force of the resilient member and open the nozzle. An electrically operated spill valve is connected between the outlet of the hydraulically operated valve and the return line.

Abstract: A fuel injection system for an internal combustion engine includes an engine management system, a return conduit connected to a low-pressure fuel system, and a common rail for storing and supplying a relatively high-pressure fuel to injectors. Each injector has a nozzle for injecting fuel into the engine, a valve installed between the common rail and the nozzle, and a spill valve connected by its inlet to the outlet of the valve and by its outlet to the return conduit. A first automatic isolating valve is installed between the common rail and the injector and a second automatic isolating valve is installed between the return conduit and the low-pressure fuel system.

Abstract: A fuel injection system for an internal combustion engine is provided for providing an injection event including a first stage and a second stage via a single nozzle. The nozzle is connected by its inlet port to a source of variable fuel pressure and it includes a needle valve for performing the first stage of injection, and a poppet valve for performing the second stage of injection. The first and second stages of injection are selectable by controlling the fuel pressure in the inlet port which is common for both the needle valve and the poppet valve.

Abstract: A fuel injection system for an internal combustion system includes an Engine Management System (EMS), a fuel feed pump, a return line, a high-pressure pump, supplying fuel under pressure to a common rail, a hydraulically operated valve forming an outlet chamber connected to the common rail and a control chamber, the valve being designed such that, in its closed position, the valve prevents the flow out of the outlet chamber, and an electrically operated pilot valve. A nozzle with a resilient member that biases the nozzle towards closing is connected to the outlet of the hydraulically operated valve in such a way that pressure at the outlet of the hydraulically operated valve tends to overcome the force of the resilient member and open the nozzle. An electrically operated spill valve is connected between the outlet of the hydraulically operated valve and the return line.

Abstract: A fuel injection system for an internal combustion engine comprises a nozzle (2) with an inlet and a cam-driven plunger (5) forming a plunger chamber (7) which is connected to the inlet of the nozzle. The injection system also comprises a common rail (10) for fuel and a control valve (9) installed between the plunger chamber (7) and the common rail (10), wherein the control valve is able to open or close hydraulic communication between the plunger chamber and the common rail upon receiving an electrical control command. An electrically actuated nozzle control valve (21) is used for opening and closing of the nozzle (2). The system also comprises a means (11) for pressurizing the common rail and regulating pressure of the fuel in the common rail (10).

Abstract: The fuel injection system according to the invention comprises a nozzle (2) with an inlet and a needle (15). A control piston (16) forms a control chamber (17) and abuts the needle such that a higher pressure in the control chamber urges the piston to close the nozzle. A cam-driven plunger (5) forms a plunger chamber (7) connected to the inlet of the nozzle. The system also comprises a common rail (11) for fuel, a feed line (13) and an electrically operated valve (9). The valve isolates the chamber from the common rail and connects it to the line while in a third position, isolates it from both the line and the common rail in a second position, and isolates it from the line and connects it to the common rail in a first position. There are also means (12) for pressurizing the feed line with a relatively low fuel feed pressure and a fuel tank (20). The control chamber is connected to the common rail.

Abstract: System and method for providing a fuel injection system having a nozzle (2) with an inlet and a needle (15). A control piston (16) forms a control chamber (17) and abuts the needle such that a higher pressure in the control chamber urges the piston to close the nozzle. A cam-driven plunger (5) forms a plunger chamber (7) connected to the inlet of the nozzle. The system also has a common rail (11) for fuel, a feed line (13) and an electrically operated valve (9). The valve isolates the chamber from the common rail and connects to the line while in a third position, isolates it from both the line and the common rail in a second position, and isolates it from the line and connects it to the common rail in a first position. There are also arrangements (12) for pressurizing the feed line with a relatively low fuel feed pressure and a fuel tank (20). The control chamber is connected to the common rail.

Abstract: A fuel injection system for an internal combustion engine comprises a nozzle (2) with an inlet and a cam-driven plunger (5) forming a plunger chamber (7) which is connected to the inlet of the nozzle. The injection system also comprises a common rail (10) for fuel and a control valve (9) installed between the plunger chamber (7) and the common rail (10), wherein the control valve is able to open or close hydraulic communication between the plunger chamber and the common rail upon receiving an electrical control command. An electrically actuated nozzle control valve (21) is used for opening and closing of the nozzle (2). The system also comprises a means (11) for pressurizing the common rail and regulating pressure of the fuel in the common rail (10).

Abstract: The fuel injection system according to the invention comprises a nozzle (2) with an inlet and a needle (15). A control piston (16) forms a control chamber (17) and abuts the needle such that a higher pressure in the control chamber urges the piston to close the nozzle. A cam-driven plunger (5) forms a plunger chamber (7) connected to the inlet of the nozzle. The system also comprises a common rail (11) for fuel, a feed line (13) and an electrically operated valve (9). The valve isolates the chamber from the common rail and connects it to the line while in a third position, isolates it from both the line and the common rail in a second position, and isolates it from the line and connects it to the common rail in a first position. There are also means (12) for pressurizing the feed line with a relatively low fuel feed pressure and a fuel tank (20). The control chamber is connected to the common rail.

Abstract: A fuel injector (1) including a first body and a second body, a capnut (9) which is in a threaded engagement with the first body and has a shoulder (10) for abutting against the second body to hold said first and second bodies together, a locating pin (7) for fixing the angular position of said first and second bodies relative to each other, a channel (14) arranged in the first and second bodies, a reciprocating needle (6) moveable within said first and second bodies for opening and closing the channel.

Abstract: A fuel injector (1) including a first body and a second body, a capnut (9) which is in a threaded engagement with the first body and has a shoulder (10) for abutting against the second body to hold said first and second bodies together, a locating pin (7) for fixing the angular position of said first and second bodies relative to each other, a channel (14) arranged in the first and second bodies, a reciprocating needle (6) moveable within said first and second bodies for opening and closing the channel.

Abstract: Fuel injectors are disclosed for use in internal combustion engines including a housing which includes a working chamber, a piston, including a plunger, for reciprocal movement within the working chamber, a hydraulic valve having one side facing the control chamber and the other side facing a poppet chamber, and including a poppet defining the poppet chamber in communication with an inlet port and the working chamber, the poppet providing a throttling slot between the working chamber and the poppet chamber, a spring urging the hydraulic valve towards the closed position, a control valve between the control chamber and the spill port, and a bypass channel between the poppet chamber and the control chamber, whereby during initial movement of the hydraulic valve from its closed position to its open position the primary bypass channel is closed and when the hydraulic valve reaches an intermediate position the primary bypass channel is open.

Abstract: A hydraulically actuated electronically controlled fuel injection system comprises a pressure intensifier (6, 7) associated with a hydraulically controlled differential valve (4) having a poppet valve (27) opening into a working chamber (10) of the pressure intensifier (6, 7). An external groove (8) is provided on the plunger (7) of the intensifier (6, 7) for connection of the plunger's compression chamber (12) with a nozzle's locking chamber (17) during an injection cut-off period.

Abstract: A hydraulically actuated electronically controlled unit injection system comprises a pressure intensifier associated with a hydraulically controlled differential valve (HDV) having a poppet valve opening into a working chamber of the pressure intensifier wherein there is a throttling slot between the poppet valve chamber and the working chamber with either at least a bypass channel between the poppet valve chamber and the working chamber or a bore connecting the working chamber to a control chamber of the HDV.

Abstract: A hydraulically actuated electronically controlled unit injection system comprises a pressure intensifier associated with a hydraulically controlled differential valve (HDV) having a poppet valve opening into a working chamber of the pressure intensifier wherein there is a throttling slot between the poppet valve chamber and the working chamber with either at least a bypass channel between the poppet valve chamber and the working chamber or a bore connecting the working chamber to a control chamber of the HDV.