Robert Boschgmbh

Andreas Roth

Georg Mallebrein

Werner Mezger

Dirk Hartmann

Nikolas Poertner

Ingo Fecht

Henri Barbier

Juergen Rappold

Ernst Wild

Lutz Reuschenbach

Klaus Winkler

Thomas Schuster

Frank Schiller

Helmut Denz

Michael Baeuerle

Wolfgang Fischer

Werner Hess

Ruediger Weiss

Christian Koehler

Michael Nau

Guido Porten

Jens Wagner

Uwe Mueller

Alexander Schenck Zu Schweinsberg

Michael Oder

Andreas Koring

Michael Drung

Holger Bellmann

Dieter Volz

Juergen Pantring

Armin Hassdenteufel

Detlef Heinrich

Christopher Harald Onder

Gerd Grass

Gudrun Menrad

Stephan Uhl

Roland Herynek

Markus Deissler

Kai Jakobs

Michael Nicolaou

Martin Rauscher

David Gaenzle

Ingolf Rupp

Mirjam Steger

Armin Huber

Jens Boettcher

Beate Rittmann

Kristina Milos

Nicolas Ide

Raffael Hedinger

Holger Bellmannn

Franco Baiocchi

Daniel Haege

The invention relates to a method for checking a functionality of a differential pressure measuring unit () in an exhaust gas recirculation system () of a motor vehicle, and a corresponding exhaust gas recirculation system (). In an air intake duct (), a sensor flap () is provided downstream of an air filter () and upstream of an opening () of an exhaust gas recirculation duct (). This sensor flap () is set in two different positions and a value of a pressure drop in the exhaust gas stream is measured for each position as said gas stream flows through an exhaust gas recirculation stream valve () provided in the exhaust gas recirculation duct (). If the measured pressure drop does not significantly change despite the movement of the sensor flap (), it can be assumed that there is a fault in the differential pressure measuring unit (). In particular, it is possible to detect when a hose (), which connects a differential pressure sensor of the differential pressure measuring unit () to a connector () on the exhaust gas recirculation duct () downstream of the exhaust gas recirculation stream valve () has torn, slipped off or become blocked.

Method for checking the functionality of a differential pressure measuring unit of a motor vehicle exhaust gas recirculation system

A method for determining a signal offset between a crankshaft angle signal and a combustion chamber pressure signal includes: measuring the combustion chamber pressure signal; shifting an alignment of the measured combustion chamber pressure signal with respect to the crankshaft angle signal by a plurality of respective offset angles to generate a plurality of offset combustion chamber pressure signals; reconstructing the offset combustion chamber pressure signals using a plurality of predetermined inherent pressure curves to generate reconstructed combustion chamber pressure signals; determining reconstruction errors of the reconstructed combustion chamber pressure signals as a function of differences between the offset combustion chamber pressure signals and the reconstructed combustion chamber pressure signals; and determining the signal offset between the crankshaft angle signal and the combustion chamber pressure signal as a one of the plurality of offset angles producing the reconstruction error having the lowest value.

Method and device for determining a signal offset between a crankshaft angle signal and a combustion chamber pressure signal in an internal combustion engine

In a method for determining a filling difference between at least two cylinders of an internal combustion engine, e.g., an Otto-cycle engine, a power output parameter contribution made available by the respective cylinder to a total power output parameter of the internal combustion engine is ascertained for each of the at least two cylinders for different fuel quantities, and an air inhomogeneity between the at least two cylinders is ascertained on the basis of the power output parameter contributions, ascertained for the different fuel quantities, of the at least two cylinders.

Method for determining a filling difference in cylinders of an internal combustion engine, operating method, and calculation unit

A method for adapting the adaptation values for the adaptation of fuel injection quantities of an internal combustion engine, to which fuel is supplyable via a mixed operation of two injection types, a first adaptation value for adapting a first injection quantity specification according to which the internal combustion engine is operated by a first injection type, and a second adaptation value for adapting a second injection quantity specification according to which the internal combustion engine is operated by a second injection type, the adaptation values being each adapted in defined, not overlapping adaptation ranges as a function of the operating state, at least one of the adaptation ranges including operating states in which fuel is supplied to the internal combustion engine via both injection types.

Method and device for adapting adaptation values for the control of injectors in an engine system having multiple injection types

A method and a device are provided for operating a drive unit having an engine and a transmission, which make possible an improved shifting strategy. In a first operating state, the engine is operated using a first number of active cylinders. In a second operating state, the engine is operated using a second number of active cylinders. The first number is different from the second number. A gear ratio is set as a function of at least one operating variable of the drive unit. The gear ratio is also set as a function of the current or the attainable operating state of the engine with respect to the number of the active cylinders.

Method and device for operating a drive unit

Disclosed is a method for adapting mechanical tolerances of a timing wheel of a sensor unit of an internal combustion engine of a hybrid drive of a vehicle, the hybrid drive having at least one second motor, in particular an electric motor, in addition to the internal combustion engine, and the internal combustion engine being operated in a desired operating mode during adaptation operation. It is provided that the desired operating mode is performed in such a way that the internal combustion engine is driven using the second motor, in particular an electric motor, and no fuel is supplied to the internal combustion engine. A corresponding device is also disclosed.

Method for adapting mechanical tolerances of a timing wheel

A method and a device are provided for operating an internal combustion engine which allow for an improved diagnosis of the valve mechanism of cylinders of the internal combustion engine. For this purpose, a variable characteristic of a suction performance of a cylinder of the internal combustion engine is ascertained. The variable characteristic of the suction performance is ascertained as a function of the mass flow flowing into an intake manifold of the internal combustion engine and of a change of the intake manifold pressure during an intake phase of the cylinder.

Method and device for operating an internal combustion engine

Method to detect a faulty operating condition during a cylinder cutoff of an internal combustion engine with at least two cylinder banks, wherein the internal combustion engine comprises in each case a separate mechanism to determine the Lambda value of the combustion for each cylinder bank. When the Lambda values of the cylinder banks change in opposite directions, a faulty cylinder cutoff is suggested.

Method to detect a faulty operating condition during a cylinder cutoff of an internal combustion engine

In order to achieve at least a short-term reduction of the torque of an internal combustion engine, which comprises a range as widely adjustable as possible, causes a slight as possible thermal stress on the components of the attached exhaust gas system and allows for a reduction of the fuel consumption, it is proposed that in addition to the cut off of the fuel-delivery control phase of a cylinder, an intake valve associated with the cylinder is cut off.

Procedure for the reduction of the torque of an internal combustion engine

A method and a device for operating an internal combustion engine are provided which make it possible to implement different deceleration requests to the internal combustion engine by switching over between half engine operation and full engine operation. A deceleration request is received particularly in a nonoperating state. A switchover is made between a first operating state and a second operating state of the internal combustion engine as a function of the magnitude of the deceleration request. The first operating state and the second operating state differ, in this instance, in the number of cylinders whose charge changing process is interrupted.

A method and a device for operating an internal combustion engine make it possible to shift the combustion limit. In this context, a predefined output variable of the internal combustion engine such as the torque, for example, is realized in at least one operating state of the internal combustion engine by at least a retardation of an ignition angle. It is checked whether, due to the retardation of the ignition angle, a variable like, for example, a misfiring, characteristic for the combustibility of the air/fuel mixture in a combustion chamber of the internal combustion engine, exceeds a predefined limiting value in terms of a deterioration of the combustibility, and in this case, at least one actuator of the internal combustion engine, different from an actuator for setting the ignition angle, such as the exhaust-gas recirculation valve or EGR valve, for instance, is controlled along the lines of improving the combustibility of the air/fuel mixture.

A method and a device for operating an internal combustion engine including at least one cylinder are described, the at least one cylinder including at least one intake valve and at least one exhaust valve and a diagnosis of at least one erroneous intake valve or at least one erroneous exhaust valve is made possible without using a position acknowledgment. A gas exchange of the at least one cylinder is diagnosed thereby. For detection of at least one intake valve or exhaust valve for the existence of an erroneous valve position, at least one intake valve or exhaust valve of the at least one cylinder different from at least one intake valve or exhaust valve to be detected is brought into a predefined position, which is selected in such a way that the gas exchange of the at least one cylinder in the case of an erroneous valve position of the at least one intake valve or exhaust valve to be detected differs significantly from the gas exchange of the at least one cylinder for the case of an error-free valve position of the at least one intake valve or exhaust valve to be detected, a value characteristic for the gas exchange of the at least one cylinder being ascertained, this value being expected at the moment for an error-free state of the set valve positions of the at least one intake valve and the at least one exhaust valve of the at least one cylinder, the actual value characteristic for the gas exchange of the at least one cylinder being ascertained and an error in the position of the at least one intake valve or exhaust valve to be detected is recognized as a function of the deviation in the actual value from the expected value.

Method and device for operating an internal combustion engine having at least one cylinder

A method and a device for operating an internal combustion engine having a plurality of cylinder banks which allow a simple diagnosis of a faulty deactivation of the gas exchange of at least one cylinder bank, or a simple determination of the ambient pressure. In the process, in addition to at least one first cylinder bank having activated gas exchange of at least one cylinder, a deactivation of the gas exchange of all cylinders of at least one second cylinder bank is initiated in at least one operating state of the internal combustion engine. The at least one second cylinder bank is assigned a separate intake tract. In the at least one operating state, a variable that is characteristic for the pressure in the intake tract of the at least one second cylinder bank is measured and evaluated for the presence of undesired pressure pulsations.

Method and device for operating an internal combustion engine having a plurality of cylinder banks

A method and a device for operating a drive unit provide a switch between half-engine operation and full-engine operation. A switch takes place between two operating states of a first component of the drive unit as a function of a first performance quantity of the drive unit. A switch takes place between two operating states of a second component of the drive unit as a function of a second performance quantity of the drive unit. A check is performed whether switching between two operating states of the second component results in a shift of the first performance quantity over a switching threshold for switching between two operating states of the first component, and if so, the switch between the two operating states of second component is delayed until a switch between the two operating states of first component has occurred.

A method for operating an internal combustion engine, a computer program product, a computer program, and a control and/or regulating device for an internal combustion engine make detection of an erroneously permanently closed intake valve for a cylinder of the internal combustion engine having more than one intake valve possible. Air and fuel are supplied to the cylinder of the internal combustion engine via a plurality of intake valves. The air and fuel are supplied to the cylinder via a shared duct, which opens into separate ducts for each intake valve of the cylinder. The separate ducts have the same volume. After an interruption of the fuel supply to the cylinder, the fuel supply is resumed. Starting at a first point in time of the resumption of the fuel supply, the fuel quantity supplied to one of the separate ducts is ascertained assuming a permanently closed associated intake valve. A second point in time since the resumption of the fuel supply, at which the separate duct would be completely filled with fuel for the first time if the associated intake valve were permanently closed, is ascertained from the ascertained fuel quantity. A check is performed of whether the cylinder has relatively more combustion misses between the first point in time and the second point in time than after the second point in time. In this instance, it is concluded that an intake valve of the cylinder is erroneously closed.

Method for operating an internal combustion engine, computer program product, computer program, and control and/or regulating device for an internal combustion engine

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Muehlacker-Lomersheim, Germany

Andreas Roth