The subject matter of this specification can be embodied in, among other things, an apparatus that includes a high-pressure pump having a pump element, a regulating device positioned upstream of the high-pressure pump, a fuel channel defined between an inflow side of the regulating device and the pump element, and a safety device, actuatable to reduce a through-flowable cross section of the fuel channel.

A valve arrangement for a high pressure pump includes a pump housing with a depression, and a valve housing configured to be inserted in the depression, and a clamping disc. The valve housing has at least one radial projection with a first axial boundary surface and a second axial boundary surface arranged opposite the first axial boundary surface, wherein the clamping disc extends radially over the radial projection of the valve housing and has a third axial boundary surface that corresponds with the second axial boundary surface of the valve housing. On the circumferential side, the clamping disc has a thread that can be screwed into a thread on the inner side of the depression to brace the valve housing onto the first boundary surface.

The invention relates to a common rail system for an internal combustion engine of a vehicle, comprising a high-pressure pump which delivers highly pressurized fuel to a high-pressure accumulator, from which the fuel is fed to at least one injection valve of the internal combustion engine, a low-pressure pump for conveying fuel from a fuel container via a conveying line to the high-pressure pump, a flow control valve as an electromagnetic switching valve which is arranged in the conveying line for controlling the fuel quantity which is fed by the high-pressure pump to the high-pressure accumulator; it is provided according to the invention that the flow control valve is configured as a ball seat valve with an inlet opening which is connected to the low-pressure pump and an outlet opening which is connected to the high-pressure pump, which ball seat valve is open in the de-energized state.

The pump delivered pressure is regulated to a substantially constant set value, and output flow is varied by an inlet metering valve (5) via feedback from the motion of, or flow from the spilled fuel through, a delivered pressure regulator (13, 19). The pressure regulating element can be biased to close a seal surface (12′) against flow from the outlet side of the pump (14) toward the inlet metering valve when the pump is turned off, thereby holding sufficient rail pressure to prevent boiling during hot soak conditions. In another aspect, a flow stabilization orifice (18) is provided between the outlet of the pump and the inlet metering valve, e.g., upstream of the pressure regulating element. In yet a further aspect, the inlet metering valve is hydraulically responsive (6, S, L) to changes in flow resulting from movement of the pressure responsive element (13).

A filtration device may include a securement section and a filter. The securement section may be configured to be threadably secured to and extend within an interior of a common rail fuel injector. The securement section may include a passage for fuel. The passage may extend in a direction along a central axis of the securement section. The filter may be configured to be positioned within the interior of the common rail fuel injector to filter the fuel flowing through the common rail fuel injector. The filter may include a plurality of holes that are fluidly connecting to the passage of the securement section. The diameter of the filter may be smaller than a diameter of the securement section.

Systems and methods for supplying lubricating oil to a high-pressure fuel pump of an engine fuel system. In one embodiment, a system may include a plurality of channels routing lubricating oil to a gear system and drive shaft of a pump without flowing an entire volume of the lubricating oil through a cavity of the drive shaft.

[Problem] To provide, in an engine provided with two cylinder rows, a technology that, while suppressing a cost increase, can suppress a difference in combustion performance between the cylinder rows.

[Solution] An exemplary engine includes: a first cylinder row having plural cylinders arranged in a front and rear direction; a second cylinder row arranged parallel to the first cylinder row; plural first injectors provided for the respective cylinders of the first cylinder row, plural second injectors provided for respective cylinders of the second cylinder row; and a fuel pump having a first discharge port to discharge a fuel to the plural first injectors and a second discharge port to discharge a fuel to the plural second injectors. The fuel pump is placed between the first cylinder row and the second cylinder row in a plan view from an up and down direction.

Disclosed is a method for controlling a fuel pump for a motor vehicle, including determining if a set amount of fuel to be compressed is less than the minimum volume that can be delivered by the pump and, if this is the case, determining a new set amount of fuel to be compressed equal to the product of a number of compressions of a volume equal to the set amount of fuel to be compressed required to achieve at least the minimum volume that can be delivered and the set amount of fuel to be compressed; transmitting the new set amount of fuel to be compressed to the fuel pump; and subsequently disabling the fuel pump for a number of occurrences of the set amount of fuel equal to the number of compressions of a volume equal to the set amount of fuel to be compressed.

A fuel pressure regulator includes a fuel inlet; a fuel outlet; a seating surface; and a valve member assembly. The valve member assembly includes a poppet and also includes a sealing member which is centered about a valve member assembly axis, is annular in shape, and includes a sealing member surface. The valve member assembly is moveable between 1) a closed position in which the sealing member surface annularly engages the seating surface, thereby preventing fuel flow from the fuel inlet to the fuel outlet and 2) an open position in which at least a portion of the sealing member surface is spaced apart from the seating surface, thereby allowing fuel flow from the fuel inlet to the fuel outlet. A spring biases the valve member assembly toward the closed position and is centered about a spring axis which is laterally offset relative to the valve member assembly axis.

The present disclosure relates to methods and fuel compositions for reducing cavitation-induced damage in common-rail injection engines operated at high fuel pressures. The fuel compositions include a gasoline-like fuel and one or more cavitation inhibitor additives.