Robert Boschgmbh

Uwe Mueller

Helmut Rembold

Markus Amler

Guido Porten

Karl Gmelin

Gottlob Haag

Heinz Stutzenberger

Volkmar Goldschmitt

Jens Wolber

Matthias Walz

Jan-Mathias Meng

Edmund Schaut

Mathias Schumacher

Gerhard Wiltschek

Klaus Joos

Udo Hafner

Winfried Moser

Thomas Frenz

Ruediger Weiss

Hansjoerg Bochum

Tilman Miehle

Andreas Roth

Manfred Ruoff

Bernd Schroeder

Matthias Philipp

Timm Hollmann

Walter Teegen

Hans-Peter Stiefel

Armin Hassdenteufel

Oliver Albrecht

Heinz Britsch

Christian Wiedmann

Hans Deichsel

Oliver Miersch-Wiemers

Joerg Frauhammer

Ralf Daeubel

Lanouar Chouk

Bernd Herrmann

Juergen Haller

Bruno H Schmidt

Harald Lang

Dietmar Krieg

Walter Lorch

Klaus Geistefeldt

Matthias Einecke

Karlheinz Schmidtpeter

Stefan Smetana

Alexandra Fuchsbauer

Richard Lorenz

In a method for regeneration of nitrogen oxide storage catalytic converters in the exhaust gas tract of a gasoline engine assigned an exhaust aftertreatment system in the form of a Y system including two three-way catalytic converters, two downstream nitrogen oxide storage catalytic converters, one shared catalytic converter for selective catalytic reduction, and a rear nitrogen oxide storage catalytic converter, a first part of the exhaust gas in the first exhaust bank is set to rich and a second part of the exhaust gas in the second exhaust bank is set to lean in a first regeneration phase and subsequently, the second part of the exhaust gas in the second exhaust bank is set to rich and the first part of the exhaust gas in the first exhaust bank is set to lean in a second regeneration phase.

Method and device for reducing the emission of nitrous oxide

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 setting an exhaust gas recirculation rate in an engine system having an internal combustion engine, the exhaust gas recirculation rate indicating the portion of the exhaust gas recirculated into one cylinder of the internal combustion engine with regard to the total gas quantity present in the cylinder, including: operating the internal combustion engine according to an input for the exhaust gas recirculation rate, an ignition of an air/fuel mixture being carried out in the cylinder at a certain ignition timing; adjusting the ignition timing in the cylinder of the internal combustion engine; correcting the input for the exhaust gas recirculation rate as a function of a change in an operating behavior of the internal combustion engine due to the ignition timing adjustment.

Method and device for controlling the exhaust gas recirculation rate for internal combustion engines during lean operation

The invention relates to a method and an apparatus for determining an exhaust gas recirculation rate in an internal combustion engine, in which the exhaust gas recirculation rate indicates a proportion of exhaust gas in a gas quantity delivered to a cylinder of the internal combustion engine, and combustion takes place in the cylinder of the engine cyclically during a combustion phase. The method includes the steps of ascertaining a combustion course statement over the course of combustion in the cylinder of the engine, and ascertaining an actual exhaust gas recirculation rate from the combustion course statement with the aid of a predetermined exhaust gas recirculation rate function. The invention further relates to a method and an apparatus for regulating an exhaust gas recirculation rate in an internal combustion engine, in which the exhaust gas recirculation rate indicates a proportion of exhaust gas in a gas quantity delivered to a cylinder of the internal combustion engine, and combustion takes place in the cylinder of the engine cyclically during a combustion phase. The method includes the steps of ascertaining a combustion course statement over the course of combustion in the cylinder of the engine, furnishing a set-point statement as a function of an operating point of the engine, and performing a regulation to compensate for a deviation that results from the set-point statement and the combustion course statement.

Method and apparatus for determining and regulating an exhaust gas recirculation rate of an internal combustion engine

The invention relates to a method for reducing uncontrolled combustions in an internal combustion engine, which occur independently of the ignition by a spark plug, wherein uncontrolled combustions are detected in the internal combustion engine (). In order to reduce the damaging effects of the uncontrolled combustions to the internal combustion engine, the incipient uncontrolled combustion (B) is reduced after said incipient uncontrolled combustion (B) has been detected.

Method and apparatus for reducing uncontrolled combustion in an internal combustion engine

Disclosed are a method and a device for diagnosing a catalytic converter located in a exhaust gas flow. Said method and device are based on an evaluation of the hygroscopic properties of the catalytic converter.

Method for the diagnosing of a catalytic converter located in an exhaust gas flow, and device for carrying out said method

A high-pressure fuel pump and methods for controlling this high-pressure fuel pump are described in which the pumping quantity regulation does not cause significant heating of the fuel to be pumped. The partial-load efficiency of the high-pressure fuel pump, triggered in accordance with the invention, is also very good.

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

The fuel supply apparatus for supplying fuel to an internal combustion engine has a fuel tank ( ), a first fuel pump ( ) that supplies fuel from the fuel tank to a fuel line ( ), a second fuel pump ( ) that supplies fuel from the fuel line ( ) via a pressurized line to at least one fuel valve ( ) and a fuel return line ( ) that connects the fuel line ( ) to the fuel tank for return of excess fuel. A shut off valve ( ), which is closed at high temperatures, and a pressure regulator valve ( ) are arranged hydraulically in series in the fuel return line ( ). A fuel scavenger line ( ) is provided, by which fuel at high temperatures is returned to the fuel tank ( ). The fuel scavenger line ( ) conducts the fuel back to the fuel tank ( ), at least partially through the second fuel pump ( ) and through a hydraulic resistance. Gas bubble formation is prevented by a high fuel supply pressure and by transfer of heat from the second fuel pump ( ).

Fuel supply apparatus for an internal combustion engine

A fuel system serves to supply fuel to an internal combustion engine includes a reservoir and a first fuel pump whose input is connected to the reservoir and a second fuel pump whose input is connected to the first fuel pump. At least one injection valve is connected to the second fuel pump and can supply fuel at least indirectly to a combustion chamber. A leakage line is provided between the second fuel pump and the reservoir. In order to permit a reliable hot start of the engine with a simultaneously low strain on the components, the leakage line is provided with a valve device which has a shutoff function and a pressure relief function that are connected in parallel with each other.

Fuel system, method for operating the fuel system, computer program and control and/or regulating unit for controlling the fuel system

A pressure control valve serves to regulate the fuel pressure in a fuel system. The pressure control valve includes a valve housing, at least one inlet, at least one outlet, and at least one prestressed, electrically actuatable, and at least regionally ball-shaped valve member. The valve member cooperates with a valve seat structurally connected to the housing. To make it possible to achieve stable closed- and/or open-loop control properties of the pressure control valve, it is proposed that the valve seat widen conically toward the valve member, and the ball diameter of the valve member is selected such that with the valve closed, the valve member touches the valve seat in the vicinity of its farther end.

Pressure control valve

A high-pressure fuel pump which is suitable above all for use in internal combustion engines with direct gasoline injection, in which the pressure surge upon opening of a check valve between the high-pressure line and the pumping chamber of the fuel feed pump is limited by structural provisions.

High-pressure fuel pump with variable delivery quantity

A method for cooling a fuel injection system and fuel injection systems are proposed that improve the hot-starting performance of the internal combustion engine.

Method and apparatus for cooling a fuel injection system

A fuel supply system with two series-connected pumps and fuel injection valves that inject fuel directly into a combustion chamber of an engine. The system includes a relief device. In a simple embodiment, the relief device can assure that the pressure in the pressure line can drop when the engine has been shutoff. The relief line may, however, also be embodied such that during the entire time of engine operation, the pressure in the pressure line can be lowered at any time as needed. The apparatus and the method are intended for an internal combustion engine of a vehicle.

Fuel supply system and method for operating an internal combustion engine

Fuel pump

A fuel supply systems with two series-connected pumps and with fuel injection valves that inject fuel directly into a combustion chamber of an engine in which a starting process takes less time because of the small feed quantity of the second fuel pump. The system includes a valve device which assures that during the starting process the first fuel pump furnishes the fuel to the fuel valves at elevated feed pressure. In many cases, this elevated feed pressure suffices to start the engine in the quickest possible time. The apparatus and the method are intended for an internal combustion engine of a vehicle.

Fuel supply and method for operating an internal combustion engine

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Cleebronn, Germany

Uwe Mueller