Robert Boschgmbh

Ronert Bosch Gmbh

Matthias Loehr

Christian Walz

Hartmut Lueders

Thorsten Mayer

Andreas Rudolph

Stefan Wickert

Torsten Handler

Wolfgang Ripper

Johannes Schaller

Stefan Scherer

Ralf Schernewski

Rolf-Dieter Koch

Ulf-Peter Schmeling

Holger Ziegler

Wolfram Faas

A method is presented for controlling an internal combustion engine (), which includes an exhaust gas system () having an exhaust gas aftertreatment component () that temporarily stores exhaust gas constituents and can be regenerated, wherein an expected value for a temperature of the exhaust gas aftertreatment component () is formed as a function of an increase in temperature, which arises as a result of exothermal reactions during the duration of an operating mode (BA) of the internal combustion engine () which is set for the regeneration of said exhaust gas aftertreatment component (), wherein the expected value is compared with an upper threshold value (T_max) and the control of said internal combustion engine () is changed when the threshold value (T_max) is exceeded, such that an expected value formed while taking the changed control into account does not exceed said threshold value (T_max). The method is thereby characterized in that a direction of change of a current temperature of said exhaust gas aftertreatment component () is taken into account when forming the expected value.

Method for controlling an internal combustion engine in connection with an exothermal regeneration of an exhaust gas aftertreatment component

A method for operating an internal combustion engine in whose exhaust-gas region at least one SCR catalytic converter is disposed, which is acted upon by a reagent contributing to the NOx conversion in the SCR catalytic converter, and a device for implementing the method. The reagent level in the SCR catalytic converter is controlled or regulated to a predefined reagent setpoint level, which is specified to at least a maximum value, which corresponds to an SCR catalytic converter completely filled with reagent. In this way the SCR catalytic converter is always operated at the highest possible efficiency at which the highest possible NOx conversion takes place.

Method for operating an internal combustion engine and device for implementing the method

Methods and devices to monitor an exhaust gas after-treatment system of an internal combustion engine with a motor block and an exhaust gas duct. The engine has at least one catalytic converter, upstream from which a reagent substance necessary for the NOreduction in the catalytic converter is introduced by means of an introduction device. The reduction agent rate is increased to such an extent at defined reference operating points until an ammonia breach is detected in direction of flow behind the catalytic converter by means of an ammonia sensitive sensor in the exhaust gas duct.

Procedure and device to monitor an exhaust gas after-treatment system

A method for operating an internal combustion engine in whose exhaust gas region at least one SCR catalytic converter is arranged, a reagent which contributes to NOx conversion in the SCR catalytic converter being applied to said SCR catalytic converter, and a device for carrying out the method are proposed. A measure for the NOx current which occurs downstream of the SCR catalytic converter is both calculated and measured with an NOx sensor which has lateral sensitivity to the reagent. The difference between the calculated measure and the measured measure of the NOx current is determined. A reagent signal which defines the metering of the reagent is influenced as a function of the difference. Plausibility checking is provided, during which the reagent quantity which is metered in a predefined time period and the reagent quantity which is converted in the SCR catalytic converter and/or the converted NOx quantity are compared with one another. When a deviation is detected, a correction signal which also influences the reagent signal is made available.

Method for operating an internal combustion engine and device for carrying out the method

invention relates to a method for operating an internal combustion engine, in the exhaust gas section of which is arranged at least one SCR catalytic converter, which is hit with a reagent that contributes to NOconversion in the SCR catalytic converter, and to a device for implementing the method. At least one measure is calculated for the NOconcentration downstream after the SCR catalytic converter. An NOsensor, which is arranged downstream after the SCR catalytic converter, generates an exhaust gas sensor signal which corresponds to at least the NOconcentration and optionally, as a result of cross sensitivity, to a reagent slip. A reagent signal, which determines the dosage of reagent, is influenced by a correction signal as a function of the difference and as a function of a measure for the temperature of the SCR catalytic converter.

A method for operating an internal combustion engine whose exhaust area has at least one SCR catalytic converter and a device for carrying out the method are described. The SCR catalytic converter receiving the reagent supports the conversion of the raw NOx emission of the internal combustion engine. At least a measure of the NOx concentration occurring downstream from the SCR catalytic converter is calculated and this value may be used to define a metering signal for the reagent and/or a heating measure for heating the SCR catalytic converter may be initiated. According to a refinement of this arrangement, a difference between the calculated NOx concentration and the sum of the measured NOx concentration and the measured reagent concentration downstream from the SCR catalytic converter is determined, and it is possible to intervene in the determination of the metering signal depending on the difference.

Method for operating an internal combustion engine and a device for carrying out the method

A method for operating a catalytic converter used for purifying the exhaust gas of an internal combustion engine, and a device for implementing the method, which provide for an open-loop or closed-loop control of the reagent fill level in the catalytic converter to a predefined storage setpoint value. The targeted stipulation of the storage setpoint value ensures, on one hand, that in non-stationary states of the internal combustion engine, there is a sufficient quantity of reagent available for the completest possible removal of at least one unwanted exhaust-gas component, and on the other hand, a reagent slip is avoided.

Method for operating a catalytic converter used for purifying the exhaust gas of an internal combustion engine and a device for implementing the method

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Steinheim/Hoepfigheim, Germany

Matthias Loehr