Daimler Chrysler Ag

Daimler Ag

Nicholas Fekete

Thomas Liebscher

Stefan Pischinger

Hans Fausten

Bernd Krutzsch

Berthold Keppeler

Markus Paule

Frank Duvinage

Michel Weibel

Siegfried Weber

Marc Chaineux

Bernd Christner

Ruediger Pfaff

Anton Kerckhoff

Norbert Ruzicka

Michael Lenz

Holger Adler

Ulrich Merten

Lorenzo Matassini

Thomas Muehleisen

Lothar Welte

Sven Pfoertsch

Karsten Finger

Joachim Bornitz

In a device and a method for removing nitrogen oxides from the exhaust of an internal combustion engine which is operated predominantly with an excess of air, the internal combustion engine is assigned an exhaust system having a nitrogen oxide reduction catalytic converter which comprises two catalytic converter parts, whose reducing agent filling levels can be determined. Metering of a reducing-agent-containing additive into the exhaust gas of the internal combustion engine takes place as a function of the reducing agent filling level of the first catalytic converter part and/or of the second catalytic converter part.

Device for removing nitrogen oxides from internal combustion engine waste gas and method for dosing an aggregate of internal combustion engine waste gas

In a method and apparatus for the cylinder-specific determination and control of a fuel injection quantity for a multi-cylinder internal combustion engine, the exhaust gas pressures of the cylinders of the internal combustion engine is recorded on a time-resolved, i.e. crankshaft angle-resolved, basis, and an exhaust gas pressure is calculated therefrom individually for each cylinder and used to determine the fuel quantity injected into the corresponding cylinder. In a comparison with a desired value the cylinder-specific actual fuel injection quantity error is then determined and used to set a corrected quantity of fuel to be injected into the corresponding cylinder.

Method and apparatus for the cylinder-specific determination and control of a fuel injection quantity

In a method for operating a diesel engine and a diesel engine, wherein engine emission control is provided by switching between a lean mode with superstoichiometric combustion air ratio &#x3bb;&#x3e;1 and a rich mode with substoichiometric combustion air ratio &#x3bb;&#x3c;1, the engine-torque fluctuations during the switching are determined and engine parameters which influence the engine torque, are adjusted so as to keep the engine torque constant during the switchover.

Method for operating a diesel engine, and diesel engine

A system for automatic charging pressure control using an exhaust gas turbocharger with a variably adjustable turbine cross-section and for automatic exhaust gas recirculation control in the case of an internal-combustion engine, particularly a diesel engine. An automatic control system has a first controller which has an output for the variation of the turbine cross-section of the exhaust gas turbocharger. The command variable for the automatic exhaust gas recirculation control in a first low load-rotational speed range is the air flow rate in the intake pipe. The command variable for the automatic charging pressure control in a second higher load-rotational speed range is the charging pressure in the intake pipe. For the automatic exhaust gas recirculation control, an exhaust gas recirculation pipe connects the exhaust gas pipe with the suction pipe. In the case of this system, for achieving the lowest possible pollutant emission while simultaneously minimizing fuel consumption, exhaust gas recirculation rates which are as precise as possible are defined in the lower load-rotational speed range, and a charging pressure which is as precise as possible is defined in the upper load-rotational speed range via a corresponding automatic control.

Automatic charging pressure control and automatic exhaust gas recirculation control system in an internal-combustion engine, particularly a diesel engine

An arrangement for detecting the turbocharger rotational speed on internal-combustion engines is provided with at least one piezoelectric acceleration sensor fixed on the turbocharger and with an analyzing circuit having an analog filter arrangement for filtering the output signals of the acceleration sensor. The output signals of the filter arrangement are fed by way of a frequency-to-voltage converter in the form of an analog voltage, or directly in the form of frequency signals, as input signals to an electronic control unit of the internal-combustion engine or to a measuring and/or display unit. As a result, the turbocharger rotational speed can be detected at a reasonable cost with a small and robust arrangement suitable for mass production and requiring no constructional changes on the turbocharger.

Rotational turbocharger speed detector

The invention relates to a method of operating a diesel engine having an engine controller which controls the operation of the diesel engine as a function of characteristic maps and permits rich/lean control of the diesel engine. The engine controller includes a computer which effects a changeover to rich or lean operation of the diesel engine as a function of predetermined changeover criteria, a sensor system which communicates with the computer and monitors parameters needed for changeover criteria, and a memory which communicates with the computer and in which the characteristic maps for operating the diesel engine are stored. The computer effects a changeover from lean to rich operation when all the changeover criteria in this respect are satisfied, and effects a change back from rich to lean operation when at least one of the changeover criteria in this respect is satisfied.

Method for running a diesel engine

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Stuttgart, Germany

Nicholas Fekete