Robert Boschgmbh

Rainer Peck

Christian Kriechbaum

Steffen Meyer-Salfeld

Thomas Breitbach

Rene Zieher

Michael Schenk

Horst Mueller

Andreas Huber

Matthias Gaenswein

Markus Viereck

Stefan Motz

Stephan Olbrich

Oliver Schulz

Bjoern Alexander Schuetz

Stephan Topp

Micha Muenzenmay

Oliver Hasslacher

Haris Delic

Harry-Alexander Kempf

Ruediger Schaller

Oliver Becker

A method for monitoring a fuel pressure in a fuel injection system of an internal combustion engine. A setpoint fuel pressure is initially set in the fuel injection system. Next, a first fuel injection and a subsequent second fuel injection are executed at a time interval shorter than a decay time of a pressure wave in the fuel injection system, triggerable by the first fuel injection. In an additional step, a monitored fuel injection quantity, which is injected via the second fuel injection, is ascertained. An action is executed if the monitored fuel injection quantity differs from a setpoint fuel injection quantity, which is predefinable for the setpoint fuel pressure, by more than a limiting value. The invention also relates to a computer program product for executing the method and to a device for monitoring a fuel pressure in a fuel injection system of an internal combustion engine.

Method and device for monitoring a high-pressure fuel system

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

Described is a method for operating an internal combustion engine (), in which method at least one parameter of the exhaust gas flowing in an exhaust-gas duct () is detected by at least one exhaust-gas probe (), wherein the internal combustion engine () is at least temporarily turned over by a starting device (), during which an injection and combustion of fuel does not take place, and during and/or after which the exhaust-gas probe () is adjusted.

Method for operating an internal combustion engine

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

In a fuel system of an internal combustion engine, the fuel quantity injected into a combustion chamber is a function of an activation period, during which a fuel injection device is activated. A pressure sensor detects the pressure in the fuel rail and provides a signal. The pressure in the fuel rail may be regulated to a setpoint pressure using a setting unit and employing the signal provided by the pressure sensor. The following method is provided for testing the fuel system:

Method for operating a fuel system

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Ludwigsburg, Germany

Rainer Peck