A pump device for an internal combustion engine, having a high-pressure fuel pump for supplying fuel to a first injection device, having at least one low-pressure inlet, via which the fuel is fed to the high-pressure fuel pump from a low-pressure fuel pump, having at least one low-pressure outlet for conducting the fuel conveyed by the low-pressure fuel pump and fed via the low-pressure inlet to the high-pressure fuel pump out of the high-pressure fuel pump, and having at least one low-pressure port, for conducting fuel conveyed by the low-pressure fuel pump to a second injection device. At least one mixing region mixes the fuel flowing through the low-pressure outlet with fuel fed to the mixing region from the low-pressure fuel pump upstream of the high-pressure fuel pump. The low-pressure port is fluidically connected to the mixing region, and the low-pressure inlet is supplied with fuel from the mixing region.

A pressure damping device for a fluid circuit includes a lower body having a fluid inlet port and a fluid outlet port. An upper cover attaches to the body. An elastically deformable membrane is interposed between the body and the cover, and a circular cup is arranged on the membrane. A spring is interposed between the cup and a bottom of the cover. The body includes a support member for supporting the membrane, with the support member projecting from the first bottom and including a free upper end on which the membrane is adapted to be supported.

A fuel injection apparatus for a piston engine includes a fuel injector body in which an injector needle is provided, which injector needle is arranged to prevent or allow fuel injection flow from the injection apparatus based on the position of the injector needle. The position is effected by a pressurized control fluid so that by applying the pressurized control fluid the needle may be urged towards its closed position and by reducing the pressurized control fluid the needle may be allowed to move away from its closed position. The injection apparatus includes a flow path for the control fluid, wherein the flow path for the control fluid comprises a restriction section providing a restriction effect to the control fluid flow. The restriction section includes at least one temperature-effected member providing a temperature-dependent restriction effect.

A distal end portion of an injector is fitted into a mounting member. A fuel joint having a connecting pipe portion is connected to a proximal portion of the injector. A joint pressing member which restricts the displacement of the fuel joint in the direction away from the mounting member is fixed by fastening to the mounting member. The injector is fixed to the mounting member by restricting the displacement of the fuel joint by the joint pressing member.

Methods and systems are provided for operating a lift pump of an engine fuel system. In one example, a method may comprise predicting when a fuel rail pressure will decrease below a threshold assuming that a lift pump remains off. The method may further comprise powering on the lift pump before the fuel rail pressure decreases below to the threshold to prevent fuel rail pressure from decreasing below the threshold.

A system, which may be embodied particularly as a fuel injection system for high pressure injection in internal combustion engines, includes a fuel distributor and a mounting support, which is used for fastening the fuel distributor to an externally-mounted structure, particularly a cylinder head, of an internal combustion engine. In this case, a damping composite element is provided, which is connected to the mounting support and/or the fuel distributor. The damping composite element includes at least one metal layer, which is formed at least essentially of a metallic material, and at least one elastically deformable damping layer.

A system, which may be embodied particularly as a fuel injection system for high pressure injection in internal combustion engines, includes a fuel distributor and a mounting support, which is used for fastening the fuel distributor to an externally-mounted structure, particularly a cylinder head, of an internal combustion engine. In this case, a damping composite element is provided, which is connected to the mounting support and/or the fuel distributor. The damping composite element includes at least one metal layer, which is formed at least essentially of a metallic material, and at least one elastically deformable damping layer.

A fuel guiderail assembly and an internal damper holder used for the fuel guiderail assembly. The fuel guiderail assembly comprises a fuel guiderail, a first end cap and a second end cap used to close the fuel guiderail, internal dampers, and a first internal damper holder and a second internal damper holder. The internal damper is provided with a first end and a second end. The first end and second end each comprise a main body and a raised part provided on the main body. The holders comprise a clamping part with a slit and a first holding part and a second holding part connected to the clamping part through the first elastic part and the second elastic part, respectively. Said first internal damper holder and second internal damper holder are respectively fixed by the first end cap and the second end cap, and the main bodies of the first end and the second end of the internal dampers are respectively enclosed in the slits of the first internal damper holder and the second internal damper holder so that the internal dampers are prevented from moving in a first direction and a second direction. In addition, the raised parts on the main bodies are blocked by the clamping parts so that the internal dampers are prevented from moving in a third direction and are securely fixed inside the fuel guiderail.

An injector has an inlet body. A cup is in a bottomed tubular shape to hold the inlet body. The cup has a sidewall defining first apertures and second apertures. A first pin is inserted in the first apertures. A second pin is inserted in the second apertures. The first pin and the second pin are configured to hold the inlet body and to restrict rotation of the inlet body relative to the cup.

A highly-efficient, yet simply constructed internal combustion engine includes an intake cylinder to accommodate intake and pre-compression of an oxidizing agent, a combustion cylinder to accommodate a further compression of the oxidizing agent, an injection and ignition of fuel, and a partial expansion of combustion gases produced by the ignition of fuel; and an exhaust cylinder to accommodate a further expansion of the combustion gases and subsequent exhausting of the further expanded combustion gases. A reciprocating piston is inside each of the intake, combustion and exhaust cylinders and a crankshaft is coupled to the reciprocating pistons. A first transfer passage facilitates flow of the pre-compressed oxidizing agent from the intake cylinder to the combustion cylinder and a second transfer passage facilitates flow of the partially-expanded combustion gases from the combustion cylinder to the exhaust cylinder.