The invention relates to a fuel injection device for an internal combustion engine comprising at least one central rail which is in fluid communication with at least one primary fuel tank, characterized in that at least one auxiliary fuel pressure accumulator is provided, the internal volume of which is in communication with the central rail via at least one control valve in order to temporarily provide a simultaneous fuel supply to the central rail from the auxiliary fuel pressure accumulator and the primary fuel tank.

A fuel injector for an internal combustion engine is disclosed. The fuel injector is installable in a cylinder head bore of a cylinder head of the engine and has a body region arranged to be received within the cylinder head bore, and a head region arranged to extend outside the cylinder head bore to protrude from the cylinder head when the injector is installed in the cylinder head bore. The injector includes a first valve needle arranged to control the injection of a gaseous fuel from a first outlet, a second valve needle arranged to control the injection of a liquid fuel from a second outlet, a gaseous fuel inlet for admitting the gaseous fuel to the injector, and a liquid fuel inlet port for admitting the liquid fuel to the injector. The gaseous fuel inlet is disposed in the body region of the injector, and the liquid fuel inlet port is disposed in the head region of the injector. The injector can also include an internal accumulator volume so that an external fuel rail is not necessary.

A returnless fuel system includes a fuel injector, an accumulator, a first fuel pump assembly and a second fuel pump assembly. The accumulator is adapted to store pressurized fuel that is utilized by the fuel injector during prescribed conditions. The first fuel pump assembly is adapted to supply the pressurized fuel at a controlled pressure to the fuel injector. The second fuel pump assembly is in fluid communication with the accumulator and the first fuel pump assembly, and is adapted to provide the pressurized fuel at a controlled pressure to the first fuel pump assembly and the accumulator.

The invention relates to a fuel injection device (100) for a compression-ignition engine, comprising a first storage unit (20) which can be supplied with fuel by at least one high-pressure pump (16), the first storage unit (20) being arranged preferably inside the high-pressure pump (16), a first connecting line (26) from the first storage unit (20) to a second storage unit (30), and a second connecting line (40) from the second storage unit (30) to a fuel injector (50).

In a hybrid fuel supply system for the same high pressure supply pump used for gasoline direct injection (DI) is also used to supply the port injection (PI) system. For a given pumping stroke, fuel can be delivered only to the DI system, only to the PI system, or a first portion can be delivered to the DI system and a second portion delivered to the PI system. The pumping chamber always fills to maximum volume. Fuel metering for DI is by a control valve, which when closed delivers fuel into the DI system and when opened spills pumped fuel into the PI system. Any spill at high pressure opens a pressure regulating valve in the PI system that dumps fuel at excess pressure to a low pressure region to maintain the PI system at a constant target pressure.

Various embodiments include a high-pressure fuel pump for a fuel injection system comprising: a housing defining a housing bore with a pressure chamber in a first end region and a leakage chamber in a second end region; a pump piston, during operation of the high-pressure fuel pump moved in translation between the pressure chamber and the leakage chamber along an axis; wherein the leakage chamber includes a leakage collecting region and an equalizing region arranged in circular annular fashion around the pump piston guiding section and extending parallel to the axis from the leakage collecting region toward the pressure chamber; and a low-pressure damper arranged in the equalizing region, the low-pressure damper comprising an annular piston damper and an annular piston guided to move along the axis within an annular bushing.

A device for injecting fuel into the combustion chamber of an internal combustion engine comprising at least one injector. The injector includes an injector body, a high-pressure accumulator integrated into the injector body, an injection nozzle, a high-pressure bore, and a feed bore. The injection nozzle defines a nozzle chamber and has a nozzle needle configured to be guided in an axially movable manner and that is surrounded by the nozzle chamber. The high-pressure bore is connected to the high-pressure accumulator and the nozzle chamber. The feed bore is configured to feed high-pressure fuel to the high-pressure accumulator. Additionally, the feed bore has a lance connection positioned laterally on the injector body, is formed as a bore separate from the high-pressure bore, and connects the lance connection directly to the high-pressure accumulator.

A method for operating an internal combustion engine with a motor having a number of cylinders and an injection system having a common rail with a number of injectors assigned to the cylinders and similar high pressure components, which is designed to hold fuel from the common rail for the injector, wherein the method has the steps: injecting fuel from the common rail into a cylinder by way of an injector, determining a fuel pressure for a high-pressure component, in particular the common rail, the injector and/or the individual reservoir, having at least one high-pressure sensor measuring the fuel pressure. Provision is made for a defect in the high-pressure sensor to be detected in that a check is made as to whether magnitude of the high-pressure control deviation (ep) during a predetermined time interval (t.sub.Limit1.sup.SD, t.sub.Limit2.sup.SD, t.sub.Limit3.sup.SD) exceeds a predetermined limiting value (e.sub.Limit1.sup.SD, e.sub.Limit2.sup.SD, e.sub.Limit3.sup.SD).

There is disclosed a solenoid valve for a fuel injection system, in which solenoid valve a closing element which interacts with a valve seat in order to close and open the solenoid valve is actuated by a control pin, the control pin being formed by way of a solenoid plunger. Furthermore, a high pressure fuel pump is disclosed which has a solenoid valve of this type.

In a hybrid fuel supply system for the same high pressure supply pump used for gasoline direct injection (DI) is also used to supply the port injection (PI) system. For a given pumping stroke, fuel can be delivered only to the DI system, only to the PI system, or a first portion can be delivered to the DI system and a second portion delivered to the PI system. The pumping chamber always fills to maximum volume. Fuel metering for DI is by a control valve, which when closed delivers fuel into the DI system and when opened spills pumped fuel into the PI system. Any spill at high pressure opens a pressure regulating valve in the PI system that dumps fuel at excess pressure to a low pressure region to maintain the PI system at a constant target pressure.