An improved injector cup may be used in diesel engines that fits more securely into the engine's cylinder heads to better prevent engine coolant from leaking into the fuel and/or fuel leaking into the coolant. An improved injector cup may be designed to accommodate specific engine types and sizes in order to prevent engine coolant from leaking into the fuel and/or fuel leaking into the coolant.

The invention relates to a fuel injector (10), in particular a common-rail injector, comprising a valve housing (11) which can be inserted into a first receiving bore section (107) of an internal combustion machine and which has a first valve housing section (12) that faces a combustion chamber (101) of an internal combustion engine in the assembled position, said valve housing section being in contact with the combustion chamber (101) at least in some regions. At least the first valve housing section (12) consists of metal, and the first valve housing section (12) is radially surrounded by a protective element (20) in the form of a protective sleeve (21). The protective sleeve (21) extends at least over a part of the axial length of the first valve housing section (12). According to the invention, the transition region between the protective sleeve (21) and the first valve housing section (12) is sealed on the protective sleeve (21) side paired with the combustion chamber (101).

The invention relates to a fuel injector (10), in particular a common-rail injector, comprising a valve housing (11) which can be inserted into a first receiving bore section (107) of an internal combustion machine and which has a first valve housing section (12) that faces a combustion chamber (101) of an internal combustion engine in the assembled position, said valve housing section being in contact with the combustion chamber (101) at least in some regions. At least the first valve housing section (12) consists of metal, and the first valve housing section (12) is radially surrounded by a protective element (20) in the form of a protective sleeve (21). The protective sleeve (21) extends at least over a part of the axial length of the first valve housing section (12). According to the invention, the transition region between the protective sleeve (21) and the first valve housing section (12) is sealed on the protective sleeve (21) side paired with the combustion chamber (101).

An object of a control method to control a direct injection internal combustion engine that directly injects fuel in a cylinder is to reduce an increase in PN caused by attachment of the fuel to a fuel injection valve distal end. The control method cools the fuel before a fuel temperature when the fuel passes through an injection hole on a fuel injection valve reaches a temperature at which an amount of attached fuel to the fuel injection valve distal end increases.

An object of a control method to control a direct injection internal combustion engine that directly injects fuel in a cylinder is to reduce an increase in PN caused by attachment of the fuel to a fuel injection valve distal end. The control method cools the fuel before a fuel temperature when the fuel passes through an injection hole on a fuel injection valve reaches a temperature at which an amount of attached fuel to the fuel injection valve distal end increases.

A method for deposit mitigation in a gaseous fuel injector that introduces a gaseous fuel through a gaseous fuel orifice directly into a combustion chamber of an internal combustion engine includes at least one of a) reducing the ago length of the gaseous fuel orifice by substantially between 10% to 50% of a previous length of a previous gaseous fuel orifice showing deposit accumulation above a predetermined threshold; b) providing the gaseous fuel orifice with an inwardly and substantially linearly tapering profile; c) determining deposit mitigation is needed; and performing at least one of the following deposit mitigation techniques i) increasing gaseous fuel injection pressure wherein deposit accumulation is reduced during fuel injection; and ii) decreasing gaseous fuel temperature wherein a rate of deposit accumulation is reduced; and d) injecting compressed air through the gaseous fuel orifice during shutdown of the internal combustion engine; whereby torque loss in the internal combustion engine due to deposit accumulation in the gaseous fuel orifice is reduced below a predetermined value.

A cylinder of an engine of a motorcycle is tilted frontward. A throttle unit is provided above the cylinder, and a heat shielding sheet is provided between the cylinder and the throttle unit. The throttle unit includes a fuel injection device, and the heat shielding sheet extends between the fuel injection device and the cylinder.

A fuel supply device for a motorcycle having a fuel pump disposed on the outside of a fuel tank for saving with respect to an installation space and for making a fuel pipe connecting the fuel tank and the fuel pump shorter. A fuel supply device for a motorcycle includes a single main frame extending rearwardly from a head pipe; a fuel tank supported on the main frame; an internal combustion engine; a fuel injection device attached to the internal combustion engine; and a fuel supply portion having a fuel pump by which the fuel is supplied to the fuel injection device via a fuel pipe. The fuel pump is provided on the outside of the fuel tank and attached to the main frame in such a manner that an axial line in a direction in which to connect the fuel pipe is aligned along the main frame.

Methods and systems are provided for continuously estimating a direct injector tip temperature based on heat transfer to the injector from the cylinder due to combustion conditions, and heat transfer to the injector due to flow of cool fuel from the fuel rail. Variations in the injector tip temperature from a steady-state temperature are monitored when the direct injector is deactivated. Upon reactivation, a fuel pulse width commanded to the direct injector is updated to account for a temperature-induced change in fuel density, thereby reducing the occurrence of air-fuel ratio errors.

A press-fit sleeve for sealing and cooling a component projecting through a fire deck opening in the cylinder head of an internal combustion engine is described. The press-fit sleeve includes a connecting point at a first end of the press-fit sleeve, said connecting point being designed for press fitting into an indentation at an end of the fire deck opening that faces away from a combustion chamber. Furthermore, the press-fit sleeve includes a radially inwardly protruding step at a second end of the press-fit sleeve lying opposite the first end. Between the first end and the second end, the press-fit sleeve includes a lateral surface which is closed in a fluid-tight manner and is or can be brought into contact with a water jacket surrounding the press-fit sleeve.