Robert Boschgmbh

Helmut Hechinger Gmbh & Co.

Andreas Eckert

Tobias Pfister

Andreas Dutt

Dirk Foerstner

Bernhard Just

Herbert Schoemig

Matthias Mansbart

Siegfried Goetz

Joerg Neumann

David Schuetz

Martin Metzger

Karl Hoss

Sven Haubold

A method and a device for operating a combustion engine which features an injection of a cooling fluid into a combustion chamber of the combustion engine, in which a knocking risk is determined during a current combustion in the combustion chamber, and an injection of the cooling fluid into the combustion chamber takes place when the knocking risk exceeds a threshold value.

Method and device for operating a combustion engine

The present invention relates to a method for operating an exhaust gas aftertreatment apparatus () of an internal combustion engine (), which comprises an oxidation catalytic converter (), an SCR catalytic converter () and a first temperature sensor () disposed in the direction of flow downstream of the oxidation catalytic converter () and upstream of the SCR catalytic converter (), an exhaust gas atmosphere capable of exothermal reaction in said oxidation catalytic converter () being generated by the metering of hydrocarbons into the exhaust gas () upstream of said oxidation catalytic converter () during a heating operation. The method is thereby characterized in that a first numerical measurement value of a nominal value of a hydrocarbon conversion in said oxidation catalytic converter () is formed, in that a second numerical measurement value of an actual value of the hydrocarbon conversion in said oxidation catalytic converter () is determined as a function of the signals of the first temperature sensor (), in that the second numerical measurement value is compared with the first numerical measurement value and in that the metering of the hydrocarbons is reduced if said second numerical measurement value is smaller than said first numerical measurement value. An independent claim relates to a control device set up for carrying out the method.

Method for operating an exhaust gas aftertreatment apparatus

In a method for monitoring the functionality of a temperature sensor that can deliver an electrical signal as a function of the measured temperature and is disposed, in particular, in the cooling water circuit of an internal combustion engine, the persistence of the temperature sensor in the high signal range is made possible by a method encompassing the following steps: Characterizing the sensor as possibly faulty if the sensor indicates, upon engine shutdown, at least a maximum value of the cooling fluid temperature; determining a first gradient of the cooling fluid temperature, measured by the possibly faulty sensor, up to a first point in time after engine shutdown, and characterizing the sensor as fault-free if the gradient exceeds a minimum value; determining a second gradient of the cooling fluid temperature, measured by the possibly faulty sensor, between the point in time and a point in time after engine shutdown, and characterizing the sensor as fault-free if the second gradient exceeds a minimum value; determining the cooling fluid temperature measured by the possibly faulty sensor at a point in time after engine shutdown, and characterizing the sensor as fault-free if the cooling fluid temperature falls below a maximum value.

Method for monitoring the functionality of a temperature sensor

Magnet coil used in a fuel injection pump

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Korntal-Muenchingen, Germany

Andreas Eckert