Abstract: In a method for operating an internal combustion engine of a motor vehicle, in particular, pressurized fuel is conveyed to a fuel accumulator. The fuel is injected into a combustion chamber via a fuel injector. Coking of the fuel injector is determined. A first fuel-pressure increase is implemented when the coking exceeds a threshold value.

Abstract: A fuel injector, particularly a fuel injector for fuel injection systems in internal combustion engines, has a valve needle, which cooperates with a valve-seat surface to form a sealing seat, and an armature, which engages with the valve needle, the armature being movable along the axis of the valve needle and being damped by a damping element made from an elastomer. In this context, a first intermediate ring is situated between the armature and the damping element. The damping element rests on the flange, which is connected in a force-locking manner to the valve needle. The intermediate ring and/or the flange is furnished with radial and/or axial channels which connect an interior volume located between the valve needle and the damping element to a central cutaway of the fuel injector.

Abstract: A fuel injector (1) for the direct injection of fuel into the combustion chamber of an internal combustion engine, having a valve needle (3), which is in operative connection with a valve-closure member (4), which forms a sealing seat with a valve-seat surface (6); and an armature (20), which is positioned on the valve needle (3) in an axially movable manner und cooperates with a magnetic coil (10). The armature (20) includes an armature casing (34) and an armature-stop sleeve (35), the armature-stop sleeve (35) being inserted into an inner opening (37) of the armature casing (34) in a form-fitting manner.

Abstract: A fuel injector (1) for fuel-injection systems of internal combustion engines has a solenoid coil (10); a valve needle (3) that is operatively connected to the solenoid coil (10) and acted upon by a restoring spring (23) in a closing direction, in order to actuate a valve-closure member (4) which, together with a valve-seat surface (6) formed at a valve-seat member (5), forms a sealing seat; and at least two spray-discharge orifices (7) which are formed in the valve-seat member (5). The spray-discharge orifices (7) are formed in the valve-seat member (5) in such a way that they are shielded from mixture flows circulating in a combustion chamber of the internal combustion engine.

Abstract: A fuel injection system for GDI internal combustion engines, which has a second injection valve in the intake tube, and a method for operating this fuel injection system. By injecting fuel into the intake tube at intervals by means of the second injection valve, the formation of deposits in the intake tube and on the inlet valve, which are produced due to the recirculation of exhaust gas through the exhaust recirculation tube, can be prevented and possibly existing deposits can be broken down.

Abstract: A fuel injector (1), particularly a fuel injector for fuel injection systems in internal combustion engines, has a valve needle (3), which cooperates with a valve-seat surface (6) to form a sealing seat, and an armature (20), which engages with the valve needle (3), the armature (20) being movable along the axis of the valve needle (3) and being damped by a damping element (32) made from an elastomer. In this context, a first intermediate ring (34) is situated between the armature (20) and the damping element (32). The damping element (32) rests on the flange (31), which is connected in a force-locking manner to the valve needle (3). The intermediate ring (34) and/or the flange (31) is furnished with radial and/or axial channels which connect an interior volume (36) located between the valve needle (3) and the damping element (32) to a central cutaway (42) of the fuel injector (1).

Abstract: A fuel injection valve for a fuel injection system of an internal combustion engine, in particular for injecting fuel directly into the combustion chamber of the internal combustion engine. The fuel injection valve has a magnet coil, an armature that can be pulled by the magnet coil in a direction of lift against a first return spring, and a valve needle. The valve needle has a first stop surface for the armature, which can be moved relative to the valve needle. The armature is acted upon by a second return spring. In addition, a stationary second stop surface for the armature is provided. The second return spring acts upon the armature in a direction opposite to the lift and in an inoperative position, when the magnet coil is not energized, and holds the armature in contact with the second stop surface so that a distance between the armature and the first stop surface provided on the valve needle is predefined.

Abstract: A thermal insulating sleeve for a fuel injection valve, which can be inserted in a mounting hole of a cylinder head of an internal combustion engine, has a sleeve body which at least partially envelops a nozzle body of the fuel injection valve. At the injection end of the sleeve body there is a folded-back section, in which the sleeve body has a two-layered configuration, and there is a conical section, which tapers in the direction toward the injection end and which in the assembled state fits tightly against the tapered section of the nozzle body.