Continental Automotive Gmbh

Siemens Aktiengesellschaft

Norbert Sieber

Gerd Rösel

Michaela Schneider

Stefan Barnikow

Paul Rodatz

Tino Arlt

Johannes Scheuerer

Sayim Kama

Jia Huang

An internal combustion engine with multiple cylinders and injection valves that are provided for the cylinders and that meter fuel also comprises an exhaust gas tract in which an exhaust gas catalytic converter is arranged. A characteristic value (OSC) of an oxygen storage capacity of the exhaust gas catalytic converter is determined. In accordance with the characteristic value (OSC), a heating measure (HM) for heating the exhaust gas catalytic converter is carried out.

Method and device for operating an internal combustion engine

A fault analysis method for a lambda probe of an internal combustion engine, in particular for detecting a heater input, has the following steps: measurement of an air ratio in the exhaust gas of the internal combustion engine by a lambda probe, control of the air ratio in the exhaust gas of the internal combustion engine by a lambda probe by a lambda controller intervention in accordance with the measured air ratio, and evaluation of the lambda controller intervention in order to detect a fault.

Fault analysis method for a lambda probe

In relation to a jump (SP_J_LR) from a lean air-to-fuel ratio to a richer air-to-fuel ratio, a measurement signal of the exhaust gas probe is detected after a predetermined lean-to-rich delay (t_R) as a lean-to-rich signal value (SV_LR) and is placed in relation to a lean-to-reference signal value (L_REF). In relation to a jump (SP_J_RL) from a richer air-to-fuel ratio to a leaner air-to-fuel ratio, the procedure is performed equivalently. Depending on the lean-to-rich and lean-to-rich signal value put in relation, either an asymmetrically aged or non-asymmetrically aged exhaust gas probe is detected.

Method and device for monitoring an exhaust gas probe

A test method for an exhaust gas probe () of an internal combustion engine (), particularly for a lambda probe, has the following steps: Checking an output signal (&#x3bb;) of the exhaust gas probe (), detecting a fault state of the exhaust gas probe () on the basis of the output signal (&#x3bb;) of the exhaust gas probe () and differentiating between different fault states of the exhaust gas probe ().

Test method for an exhaust gas probe of an internal combustion engine, in particular for a lambda probe

Depending on a trim controller diagnosis, a suspicion marker for an asymmetric ageing of the exhaust gas probe is allocated either a 'true' value or a 'false' value and, if the value of the suspicion marker is &#x201c;true&#x201d;, a dynamic diagnosis will be performed based on the exhaust gas probe's measuring signal, on the basis of the results of which diagnosis either an asymmetrically aged or a non-asymmetrically aged exhaust gas probe will be detected.

For operation of a motor vehicle with at least one first drive motor, at least one electrical consumer of the first drive motor is operated in an energy-saving mode after autonomous switching-off of said first drive motor. The autonomous switching-off of the first drive motor is independent of any intentional switching-off of the first drive motor by a driver of the motor vehicle.

Method and device for the operation of a motor vehicle

An internal combustion engine has at least one cylinder and an exhaust gas tract, in which an exhaust gas sensor, that can be heated in a controlled manner, is arranged. An exhaust gas temperature of an exhaust gas flowing in the exhaust gas tract is determined as a function of the heating power (P_HEAT) supplied to the exhaust gas sensor. An estimated value of the exhaust gas temperature is determined as a function of a physical model of the combustion of the air/fuel mixture and of the exhaust gas tract as a function of at least one operating variable of the internal combustion engine, but independent of the heating power supplied to the exhaust gas sensor. Model parameters of the physical model are adapted as a function of a deviation of the estimated value and of the exhaust gas temperature determined by the supplied heating power.

An exhaust gas probe is disposed downstream of a catalytic converter in an exhaust gas tract of an internal combustion engine. A first quality value which is representative of a signal dynamic of the measured signal of the exhaust gas probe is determined as a function of the measured signal of the exhaust gas probe. If the first quality value represents at least one predefined signal dynamic, the exhaust gas probe is diagnosed as functioning correctly. If the first quality value does not represent at least the predefined signal dynamic, a catalytic converter diagnosis is performed comprising a loading with oxygen and/or an emptying of oxygen with at least two different air/fuel ratios. Dependent on the catalytic converter diagnosis, the exhaust gas probe is diagnosed as functioning either correctly or incorrectly.

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Wuppertal, Germany

Norbert Sieber