Abstract: A control method for an actuator (1-4) of an injector of a fuel injection system in an internal combustion engine has the following steps: specification of a target value (SOISOLL) for the start of the injection; electric control of the actuator (1-4) at a specific trigger time (tTRIGGER) with a specific actuator energy (E); detection of an actual value (SOI1IST, SOI2 IST, SOI3 IST, SOI4 IST ) at the start of the injection; determination of the deviation between the target and actual values (DeltaSOI1, DeltaSOI2 , DeltaSOI3 , DeltaSOI4) at the start of the injection; and adjustment of the actuator energy (E) in accordance with the deviation between the target and actual values (DeltaSOI1 , DeltaSOI2 , DeltaSOI3 , DeltaSOI4) at the start of the injection to control the start of the injection.

Abstract: The invention relates to a piezoelectric actuator (1) comprising a stack of a plurality of individual piezoelectric actuator elements (2, 2?, 2?) which are arranged between inner electrodes (3, 3?, 3?). Said piezoelectric actuator comprises a first metallisation strip (4) and a second metallisation strip (5), the inner electrodes (3, 3?, 3?) being respectively connected to the first or second metallisation strips (4, 5) in an alternating manner. A first outer electrode (6) and a second outer electrode (7) are fixed to the first or the second metallisation strips (4, 5) in order to electrically contact the piezoelectric actuator (1). Said outer electrodes (6, 7) respectively comprise a connection element (8, 9) for externally contacting the piezoelectric actuator (1), and at least one region which is embodied in such a way that it compensates length variations of the piezoelectric actuator (1) in the main oscillation direction (10) as a result of its design and arrangement.

Abstract: Disclosed is a travel-transmitting element for an injection valve, comprising a pressure-loaded storage chamber which is filled with a hydraulic fluid and a storage element that is provided with an elastomeric bellows-type member. In order to ensure sufficient steadiness of the rotational speed over the service life, the inventive elastomeric bellows-type member is provided with a stiffening element which ensures constant radial stiffness over the service life at least in some sections thereof.

Abstract: The sealing element consisting entirely of elastomer is plugged onto the head plate of a piezo actuator for a fuel injection valve. Encircling sealing bulges (6) are formed on the first end of the sealing element and effect a sealing toward the injector body (2). The sealing element has passages for accommodating contact pins (7), whereby sealing lips (8) are formed around the passages in order to seal the contact pins (7). The sealing actions of the sealing bulges (6) and of the sealing lips (8) are separate from one another.

Abstract: A device, for the translation of a displacement of an actuator, in particular for an injection valve, essentially comprises two counter-displaceable pistons, coupled together by means of a translational chamber in a play-free manner. The translation chamber is filled with a translation medium and is connected to an equalization chamber by means of a sealing gap. The sealing gap only equalizes pressure differences between the translation chamber and the equalization chamber which are of long duration. One of the two pistons is pre-tensioned in a starting position by means of an externally arranged spring. A reduction in the dead volume between the pistons is possible as a result of the arrangement of the spring outside the piston.

Abstract: In a method for producing a piezostack the asymmetry of the electrically inactive zones (2, 2.1, 2.2) in a piezostack (5) having electrically inactive zones (2, 2.1. 2.2) on a plurality of sides thereof is determined, and the electrically inactive zone with an oversize is then reduced until the asymmetry reaches an acceptable proportion.

Abstract: An actuator (1) acts as a drive unit for an injector, especially for an accumulator injection system. The actuator comprises a piezostack (3) disposed in a tube spring, a top plate (2) and a bottom plate. The top plate (2) of the actuator is directly fixed to the injector housing (7) by means of caulked areas. The caulking enables the injector to be produced in a simple and economical manner.

Abstract: A device for transmitting a displacement of an actuator to a setting element comprises two pistons that delimit two transmission chambers and a compensation chamber with a housing. The compensation chamber is hydraulically connected to the two transmission chambers. The transmission chambers transmit a displacement of the first piston in order to effect a displacement of the second piston. The compensation chamber serves as a reservoir for the transmission medium with which the transmission chambers are filled. The compensation chamber is delimited by an elastomer ring. The elastomer ring depicts a simple and economical realization with which it is possible to subject the compensation chamber to the action of pressure and to change the volume of the compensation chamber at the same time. In a preferred embodiment, the elastomer ring is externally subjected to the action of a tension force via a pressure ring.

Abstract: A control module (1) for an injector of an accumulator injection system is used to control and guide a valve body (8). The control module comprises a high pressure supply line (2) for supplying fuel, and a guiding device (3) for guiding the valve body (8). A control room (4), an inlet throttle (5) and an outlet throttle (6) are also provided. The inlet throttle (5) connects the high pressure supply line (2) to the control chamber (4) and the outlet throttle (6) connects the control chamber (4) to a control valve (15). A control piston (7) is arranged in the control chamber (4), the end of the control piston opposite the control chamber (4) being connected to a high pressure region (9) on the valve body (8).

Abstract: A control module (1) for an injector designed to control and guide a valve body (8) comprises a high-pressure supply element (2), a guiding device (3) for guiding the valve body, a control compartment (4), a control valve (10), a supply choke (5), first and second output chokes (6, 7). The supply choke physically represents a connection between the high pressure supply element (2) and a valve compartment (9). The first output choke (6) connects the control compartment linked to one end of the valve body, to the valve compartment (9). The second output choke (7) connects the valve compartment (9) to the control valve (10).

Abstract: The fuel injector comprises a control module, with a piston guide extending downwards, in which a control piston is arranged. The fuel injector further comprises a nozzle body, with a top surface on which the control module is mounted. The nozzle body comprises a drilling with a nozzle needle, co-operating with the control piston, arranged in the lower section thereof and the piston guide, arranged in the upper section thereof. A high pressure inlet is arranged in the control module and opens out into the drilling at the top surface. The drilling is embodied such that, on lifting the nozzle needle from the valve seat thereof, the fuel which escapes from the fuel injector is replaced, whereby fuel from the high pressure inlet flows through the drilling in the direction of the valve seat.

Abstract: A process for determining an operating parameter of an internal combustion engine as a function of three control parameters (N, P, &lgr;) of this motor, comprises: a) establishing a first map of the operating parameter as a function of two control parameters, the third control parameter being fixed at a first value; b) establishing a second map of the operating parameter as a function of the two same control parameters, the third control parameter being fixed at a second value; c) establishing a relationship between the operating parameter and the third control parameter over all the range of variation of this parameter at at least one specific operating point; and d) using this relationship to determine the operating parameter as a function of the three control parameters at all points of operation of the motor.

Abstract: A method of determining a mass of fuel to be introduced into a suction pipe or into a cylinder of an internal combustion engine precontrols a basic injection time constituting a basic injection quantity, through a prescription of a lambda set point. The lambda set point is determined by a coordinated calculation through selecting a minimum and a maximum from a multiplicity of different lambda requirements which are derived from operating states of the internal combustion engine. Different priorities are allocated to the various lambda requirements.

Abstract: An exhaust gas sensor has first and second sensor elements. Exhaust gas surroundings of the first sensor element are catalytically activated, so that an oxygen partial pressure which is in equilibrium will always be measured by the first sensor element, regardless of the conversion capability of a catalytic converter. The exhaust gas surroundings of the second sensor element are separate from the exhaust gas surroundings of the first sensor element, so that the exhaust gas surroundings of the second sensor element are not catalytically active. As a function of the conversion capability of the catalytic converter, the second sensor element measures either an equilibrium oxygen partial pressure or a free oxygen partial pressure, which are of different magnitudes. A malfunction of the catalytic converter is detected by comparing measurement signals of the first and second sensor elements.

Abstract: A method for parametrizing a lambda controller of a lambda control device having a lambda sensor supplying an output signal at least partially exhibiting a linear dependency on an oxygen content in exhaust gas of an internal combustion engine, includes representing a transfer function of a lambda controlled system by a series connection of first and second first order delay elements and an idle time element in a lambda control loop. The first delay element contains a response behavior of the lambda sensor and the second delay element contains a sliding averaging of measured lambda values.

Abstract: A known device for the atomization of liquids for injection valves including upper and lower fluid entry levels by which a tangential entry of air is provided into a space located below the injection valve in the direction of flow by which the generally occurring unevenness of distribution of fuel to different cylinders of an internal combustion engine is to be improved. The entry of the fluid from the upper and lower levels are oppositely oriented at the individual levels and thus produce two opposing swirl flows. The device is particularly suitable for injection valves for internal combustion engines.