Robert Boschgmbh

Thomas Breitbach

Rainer Peck

Guenter Veit

Andreas Huber

Matthias Gaenswein

Christian Kriechbaum

Jens Pawlak

Achim Friedel

Oliver Becker

Viktor Albertin

Bilal Kaplan

A method () is described for operating a system (), for example a hydraulic or pneumatic system (), in which a manipulated variable of an actuator element () can be controlled, and in which at least one variable () which is dependent on the manipulated variable of the actuator element () can be determined, wherein the manipulated variable of the actuator element () is modulated with a first periodic signal (), and wherein a measurement signal () which characterizes the at least one variable () is evaluated using at least one second periodic signal ().

Method for operating a system in which a manipulated variable of an actuator element can be controlled

A method for assessing a method of functioning of a fuel injector in response to the application of a control voltage to at least one actuator of the fuel injector, including the steps of applying the control voltage to the at least one actuator of the fuel injector for a no-torque-generating injection into an engine, determining a fuel content in an exhaust tract disposed at an engine, comparing the determined fuel content with a specified comparison value, and assessing the method of functioning of the fuel injector based on the comparison result. Furthermore, also described is an evaluation device for assessing a method of functioning of a fuel injector in response to the application of a control voltage.

Method for assessing a method of functioning of a fuel injector in response to the application of a control voltage, and corresponding evaluation device

A method for determining at least one rail pressure/closing current value pair for a pressure control valve of a common rail injection system of an internal combustion engine includes the following steps: operating the common rail injection system in an MU control mode; reducing the control current for the pressure control valve; detecting the pressure curve over time in the common rail and determining the rail pressure; determining the closing current based on the detected pressure curve; and associating the determined rail pressure and the determined closing current with a rail pressure/closing current value pair.

Method for determining at least one rail pressure/closing current value pair for a pressure control valve of a common rail injection system

A method for the determination of a fuel mass of a pre-injection injected into at least one combustion chamber of an internal combustion engine by means of at least one injection under high pressure is characterized in that a corrective variable is determined for the pre-injection by means of a comparison between a measure for the actual amount of injected fuel of at least one test post-injection carried out for a predetermined target amount of a desired pre-injection due to a measure, and the measure for the target amount.

Method for the determination of an injected fuel mass of a preinjection

A method for operation of an internal combustion engine, comprising an exhaust treatment device in the exhaust system thereof, with application of a reagent under given operating conditions of the internal combustion engine and/or the exhaust treatment device and a device for carrying out the method are disclosed, wherein a correction parameter is determined for a reagent signal, describing the amount of reagent to be introduced into the exhaust system and the correction parameter is determined by means of a comparison of a measure of the actual amount of the reagent in the exhaust system, which should be introduced based on a measure of a pre-determined set amount and the measure of the set amount. The above method permits a particularly exact maintenance of the amount of reagent introduced into the exhaust system in accordance with the pre-determined measure for the set amount.

Method for operation of an internal combustion engine and device for carrying out the method

A device and a method for controlling an internal combustion engine, in which an actual value is determined based on a lambda value and compared with a setpoint value. Based on the comparison, a correction value for a controlled variable is determined and stored. An error is detected if the correction value changes abruptly.

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Stuttgart, Germany

Thomas Breitbach