Robert Boschgmbh

Achim Hirchenhein

Klaus Joos

Wolfgang Fischer

Holger Rapp

Haris Hamedovic

Joerg Koenig

Ruben Schlueter

Werner Hess

Alexander Schenck Zu Schweinsberg

Helerson Kemmer

Anh-Tuan Hoang

Bernd Wichert

Jens Neuberg

Michael Bauer

Harry Friedmann

Andreas Koch

Christian Reschke

Stephanie Wirth

Markus Amler

Guido Porten

Timm Hollmann

Traugott Degler

Silke Seuling

Stefan Gottlieb

Hans-Peter Lehr

Jochen Hofstaetter

Christoph Heisen

Eugenia Schwarz

Lorenz Oberlin

Alexander Schenck Zuschweinsberg

A method for analyzing a fluid that flows from a chamber, in particular a combustion chamber, of an internal combustion engine into a fluid guide. The internal combustion engine includes at least one element, in particular an injector, for the supply of fuel. The analysis takes place with the aid of a sensor, in particular a lambda sensor, on which the fluid in the fluid guide acts. The analysis takes place during cranking of the internal combustion engine, and the fluid acting on the sensor is not influenced by fuel that is supplied in a controlled manner.

Method for analyzing a fluid, a device for this purpose that includes means for carrying out the method, and a computer program that effectuates carrying out the method by the device

A method is described for diagnosing errors in an internal combustion engine in which fuel is injected from a high-pressure accumulator into associated combustion chambers with the aid of multiple fuel injectors, a first value (R) which is representative of a static flow rate of fuel through one of the fuel injectors being ascertained, a second value (&#x394;n) which is representative of a running smoothness of the internal combustion engine being ascertained, if at least one of the two values (R, &#x394;n) deviates from the particular associated reference value (R', &#x394;n), an error (F) being deduced, and the error (F) being assigned to the fuel injector and/or at least one further component and/or at least one operating phase of the internal combustion engine on the basis of deviations of the two representative values (R, &#x394;n) from the particular associated reference value (R&#x2032;, &#x394;n).

Method for diagnosing errors in an internal combustion engine

A method for ascertaining a correction value for fuel metering of a fuel injector of an internal combustion engine, in which fuel is injected from a high-pressure accumulator into a combustion chamber with the aid of the fuel injector, the fuel being injected into the combustion chamber in multiple separate injection procedures during one work cycle, a value representative of a static flow rate through the fuel injector being ascertained by ascertaining, for at least one of the multiple separate injection procedures, a ratio of a pressure change caused in the high-pressure accumulator by the at least one of the multiple separate injection procedures and an associated duration characteristic for the at least one of the multiple separate injection procedures being ascertained, and the correction value being ascertained based on a comparison of the representative value to a comparison value.

Method for ascertaining a correction value for fuel metering of a fuel injector

A method for recognizing a state change of a fuel injector of an internal combustion engine, in which fuel from a high-pressure accumulator is injected into a combustion chamber with the aid of the fuel injector. A value that is representative of a static flow rate of fuel through the fuel injector is ascertained. A state change of the fuel injector is deduced when the representative value differs from a comparative value by more than a first threshold value.

Method for recognizing a state of change of a fuel injector

A method for ascertaining a correction value for a fuel metering of a fuel injector of an internal combustion engine, in which fuel is injected from a high pressure accumulator into a combustion chamber with the aid of the fuel injector, a value which is representative for a static flow rate through the fuel injector being ascertained by way of ascertaining, during at least one injection process of the fuel injector, a ratio of a pressure difference occurring in the high pressure accumulator as a result of the injection process and an associated duration which is characteristic for the injection process, and the correction value being ascertained on the basis of a comparison of the representative value with a comparative value.

Method and device for ascertaining a correction value for a fuel injection quantity

A method is described for controlling the metering of fuel. A feature, which characterizes the switching point in time of a valve, is ascertained based on a measured signal curve. The feature is fed as an actual variable to a controller. A criterion of the feature is ascertained, the controller taking the criterion of the feature into account.

Method for controlling metering of fuel

A method is described for determining an opening delay of a fuel injector in which by activating a solenoid with the aid of an armature, a valve needle may be opened wherein a mathematical model is used which includes an activation duration of the solenoid as an input variable and a respective opening delay as an output variable.

Method for determining an opening delay of a fuel injector

A method for assessing an injection behavior of at least one injection valve of an internal combustion engine includes putting the internal combustion engine into a special operating mode defined by control parameters and operating the engine in the special operating mode during a diagnostic time period, at least one operating parameter of the internal combustion engine being determined at least during the diagnostic time period, and at least one quantity characterizing the injection behavior of the at least one injection valve being evaluated at least during a segment of the diagnostic time period and being evaluated on the basis of the at least one operating parameter.

Method for assessing an injection behaviour of at least one injection valve in an internal combustion engine and operating method for an internal combustion engine

A method for activating an injector in a fuel injection system in an internal combustion engine, the fuel injection system including a plurality of injectors and a quantity of fuel injected with the aid of an injector being a function of the activation period of the injector. An injector-individual correction value for the activation period is ascertained for at least one injector as a function of a pressure and a temperature of the fuel to be injected and the activation for this injector takes place under consideration of the injector-individual correction value.

Method for activating an injector in a fuel injection system in an internal combustion engine

A method for operating a valve actuated by way of an actuator, in particular a fuel injection valve of an internal combustion engine of a motor vehicle, in which a first delay time is identified, which time characterizes a time difference between a point in time of a first change in an energization signal for the actuator and a point in time of a first change in the operating state of the valve corresponding to the first change in the energization signal. According to the present invention, from the first delay time at least one second delay time of the valve is inferred, which latter time characterizes a time difference between a point in time of a second change, different from the first change, in the energization signal and a point in time of a second change in the operating state of the valve corresponding to the second change in the energization signal.

Method and control tool for operating a valve

A method for operating a valve, in particular a fuel injector of an internal combustion engine of a motor vehicle, in which an auxiliary variable is obtained as a function of at least one electrical operating variable of an electromagnetic actuator driving a component of the valve, in particular a valve needle, and in which the auxiliary variable is checked for the presence of a predefinable characteristic. A reference variable is ascertained as a function of the auxiliary variable, the auxiliary variable is modified as a function of the reference variable to obtain a modified auxiliary variable, and the modified auxiliary variable is checked for the presence of the predefinable characteristic.

Method and control unit for operating a valve

In a method for operating a fuel injector, a transition range of the characteristics curve of the injector is detected individually and adapted continuously, so that a monotonous characteristics curve is formed, with whose aid high metering precision of the injector is achieved.

Method for operating a fuel injector of an internal combustion engine, and control device for an internal combustion engine

A method for operating a valve, in particular a fuel injector of an internal combustion engine of a motor vehicle, in which an auxiliary variable is obtained as a function of at least one electrical operating variable of an electromagnetic actuator driving a component of the valve, in particular a valve needle, and in which the auxiliary variable is checked for the presence of a predefinable characteristic. A reference variable which characterizes the operating behavior of the electromagnetic actuator is ascertained, the auxiliary variable is modified as a function of the reference variable to obtain a modified auxiliary variable, and the modified auxiliary variable is checked for the presence of the predefinable characteristic.

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Bietigheim-Bissingen, Germany

Achim Hirchenhein