A connection structure for a fuel pressure sensor that connects a fuel pressure sensor for detecting a pressure of a fuel to a fuel rail in which the fuel to be supplied to an internal-combustion engine flows, includes a tubular attachment boss that is formed in the fuel rail and includes a male screw portion and an abutting surface, an attachment portion that is provided in a sensor body of the fuel pressure sensor, and includes a contact surface that abuts to the abutting surface and a bearing surface provided behind the contact surface, and a nut including a female screw portion that is screwed on the male screw portion and a pressing portion that presses the bearing surface to the abutting surface by screwing the female screw portion on the male screw portion.

Systems and methods for supplying primary fuel and secondary fuel to an internal combustion engine may include supplying a first amount of the primary fuel and a second amount of the secondary fuel to the internal combustion engine. The system may include a first manifold to provide primary fuel to the internal combustion engine, and a primary valve associated with the first manifold to provide fluid flow between a primary fuel source and the internal combustion engine. A second manifold may provide secondary fuel to the internal combustion engine, and a fuel pump and/or a secondary valve may provide fluid flow between a secondary fuel source and the internal combustion engine. A controller may determine a total power load, the first amount of primary fuel, and the second amount of secondary fuel to supply to the internal combustion engine to meet the total power load.

An engine including a main fuel injection valve, a pilot fuel injection valve, a liquid fuel supply rail pipe, and a pilot fuel supply rail pipe. The main fuel injection valve supplies liquid fuel from the liquid fuel supply rail pipe to a combustion chamber during combustion in a diffusion combustion system. The pilot fuel injection valve supplies pilot fuel from the pilot fuel supply rail pipe to the combustion chamber in order to ignite gaseous fuel during combustion in a premixed combustion system. The liquid fuel supply rail pipe is disposed at one side of an imaginary vertical plane including an axis of a crank shaft. The pilot fuel supply rail pipe is disposed at the side of the imaginary vertical plane at which the liquid fuel supply rail pipe is disposed.

An engine including a main fuel injection valve, a pilot fuel injection valve, a liquid fuel supply rail pipe, and a pilot fuel supply rail pipe. The main fuel injection valve supplies liquid fuel from the liquid fuel supply rail pipe to a combustion chamber during combustion in a diffusion combustion system. The pilot fuel injection valve supplies pilot fuel from the pilot fuel supply rail pipe to the combustion chamber in order to ignite gaseous fuel during combustion in a premixed combustion system. The liquid fuel supply rail pipe is disposed at one side of an imaginary vertical plane including an axis of a crank shaft. The pilot fuel supply rail pipe is disposed at the side of the imaginary vertical plane at which the liquid fuel supply rail pipe is disposed.

Systems and methods for supplying primary fuel and secondary fuel to an internal combustion engine may include supplying a first amount of the primary fuel and a second amount of the secondary fuel to the internal combustion engine. The system may include a first manifold to provide primary fuel to the internal combustion engine, and a primary valve associated with the first manifold to provide fluid flow between a primary fuel source and the internal combustion engine. A second manifold may provide secondary fuel to the internal combustion engine, and a fuel pump and/or a secondary valve may provide fluid flow between a secondary fuel source and the internal combustion engine. A controller may determine a total power load, the first amount of primary fuel, and the second amount of secondary fuel to supply to the internal combustion engine to meet the total power load.

A fuel rail for a fuel injection system of a vehicle comprises a distributor pipe extending along a longitudinal axis, having at least one inlet connection for connection to a fuel pump and a plurality of outlet connections for connection to one injector each, which injectors are arranged along the longitudinal axis at a distance from the inlet connection, and a support projection which is arranged between the inlet connection and the outlet connections relative to the longitudinal axis, which projection protrudes in a radial direction extending transversely to the longitudinal axis into an interior of the distributor pipe. The fuel rail further comprises a throttle piece arranged in the interior of the distributor pipe, having a through-opening extending between a first and a second end face, which through-opening has a diameter which is smaller than an inside diameter of the distributor pipe on opposite sides of the support projection in each case. The first end face of the throttle piece is placed facing the inlet connection, an outer circumferential surface of the throttle piece abuts an inner circumferential surface of the distributor pipe, and the second end face of the throttle piece abuts the support projection.

A fuel system cover is provided for an internal combustion engine. The fuel system cover is configured to be mounted on the cylinder head assembly to encapsulate a portion of the fuel system to provide leak prevention, mitigation, and detection capabilities.

In some embodiments, a fuel rail for a two-stroke internal combustion engine includes a fuel rail body, a fuel inlet component integrated within the fuel rail body as a one-piece component and in fluidic contact with a fuel line, one or more fuel exit ports in fluidic contact with a cylinder of a combustion engine, and one or more fasteners adapted to secure the fuel rail body to a cylinder wall of the cylinder of the combustion engine.

A steel pipe for pressure piping can be subjected to autofrettage. When an outer diameter of the pipe is D, an inner diameter is d, and a yield stress is σ.sub.y, and when a measured value of an outer surface residual stress is σ.sub.o1, a measured value of an outer surface residual stress after halving is σ.sub.o2, and a measured value of an inner surface residual stress after the halving is σ.sub.i2, D/d is 1.2 or more, an estimated value σ.sub.i1 of inner surface residual stress is [σ.sub.i1=(−σ.sub.i2)/(A×(t/T).sup.2−1)], where [t/T=((σ.sub.o2−σ.sub.o1)/(A×(σ.sub.o2−σ.sub.o1)−C×σ.sub.i2)).sup.1/2], [A=3.9829×exp(0.1071×(D/d).sup.2)], and [C=−3.3966×Exp(0.0452×(D/d).sup.2)] satisfies [1.1×F×σ.sub.y≤α.sub.i1≤0.8×F×σ.sub.y], and (F=(0.3×(3−D/d).sup.2−1) when 1.2≤D/d≤3.0, and F=−1 when D/d>3.0).

The fuel system for introducing liquid fuel into the cylinders of a piston engine has a fuel tank for storing the fuel, a pump for pressurizing the fuel, at least one fuel injector for injecting fuel into a cylinder of the engine, and a fuel pipe for supplying fuel from the pump to the fuel injector. The fuel system further has a source of inert gas and means for introducing inert gas into the fuel pipe for purging the fuel pipe.