Abstract: A method and a device for the dynamic monitoring of an air charging system of an internal combustion engine, subsystems of the air charging system having a low-pass characteristic, and a characteristic state quantity that is to be measured being compared with a modeled, identical state quantity. The measured signal and the modeled signal are filtered using a high-pass filter or bandpass filter, and, given a change in the characteristic state quantity that is to be measured, higher-frequency signal portions are evaluated, which is advantageous with regard to the recognition of so-called slow response errors.

Abstract: In a method for dynamic monitoring of gas sensors of an internal combustion engine, in the event of a change of the gas state variable to be measured, a dynamic diagnosis is carried out based on a comparison of a measured signal which is an actual value of an output signal of the gas sensor and a modeled signal which is a model value. The output signal of the gas sensor is filtered using a high-pass filter and higher-frequency signal components are analyzed.

Abstract: A method and a device for monitoring gas sensors in an internal combustion engine, in which in a steady-state operation of the internal combustion engine, the output signal of the gas sensor is filtered by a high-pass filter and higher-frequency signal components are analyzed by a comparison with an appropriately processed model value. When using the method and the device for executing the method, electrically oscillating gas sensors or the incoupling of interference variables or faults in the evaluation circuit, especially in the case of exhaust gas sensors in an exhaust-gas purification and reducing system, are able to be detected, which minimizes faulty interpretations in a dynamic diagnosis. This monitoring function is advantageously combinable with dynamic diagnosis functions that likewise analyze higher-frequency signal components by a comparison with appropriately processed model values. This increases the operational reliability of the exhaust-gas purification or reducing system.

Abstract: In a method for determining the lambda value with a broadband lambda sensor of an internal combustion engine, a measurement current is supplied by the lambda sensor, which measurement current is proportional to the oxygen content or rich gas content in the exhaust gas of the internal combustion engine, and the corresponding proportionality factor is determined by a thrust comparison. The thrust comparison uses the O2 concentration of dry air as reference, independent of an actually present air humidity, and the lambda value is calculated on the basis of a modified Pischinger conversion equation in which a signal supplied by a humidity sensor is taken into account.

Abstract: A method and a device for the dynamic monitoring of an air charging system of an internal combustion engine, subsystems of the air charging system having a low-pass characteristic, and a characteristic state quantity that is to be measured being compared with a modeled, identical state quantity. The measured signal and the modeled signal are filtered using a high-pass filter or bandpass filter, and, given a change in the characteristic state quantity that is to be measured, higher-frequency signal portions are evaluated, which is advantageous with regard to the recognition of so-called slow response errors.

Abstract: In a method for determining a dead time in the response characteristic of an exhaust gas sensor in order to determine an exhaust gas state quantity in an exhaust gas duct of an internal combustion engine, the dead time is determined from a measured output signal of the exhaust gas sensor and a comparison signal. An undelayed comparison signal is determined, and a cross-correlation is formed between the measured output signal and the comparison signal delayed by a model dead time selected in such a way that the cross-correlation function assumes a maximum, and the dead time of the measured output signal is set equal to the selected model dead time.

Abstract: A method for operating an internal combustion engine. The internal combustion engine has at least one cylinder, to which are connected an intake manifold having an air mass sensor, an exhaust pipe having a ?-sensor and an exhaust gas recirculation line having an exhaust gas recirculation valve. The air mass sensor generates an air mass sensor signal. The ?-sensor generates a ?-sensor signal. The exhaust gas recirculation valve is adjusted by a control signal. A setpoint injection quantity is formed and the control signal of the exhaust gas recirculation valve is formed as a function of the air mass sensor signal. An air mass replacement signal for the air mass sensor signal is formed as a function of the ?-sensor signal and the setpoint injection quantity. In the case of a faulty air mass sensor signal, the control signal is formed as a function of the air mass replacement signal.

Abstract: In a method for determining the lambda value with a broadband lambda sensor of an internal combustion engine, a measurement current is supplied by the lambda sensor, which measurement current is proportional to the oxygen content or rich gas content in the exhaust gas of the internal combustion engine, and the corresponding proportionality factor is determined by a thrust comparison. The thrust comparison uses the O2 concentration of dry air as reference, independent of an actually present air humidity, and the lambda value is calculated on the basis of a modified Pischinger conversion equation in which a signal supplied by a humidity sensor is taken into account.

Abstract: In a method for calibrating a measuring signal of an exhaust gas probe or a control signal of a fuel dosing device of a vehicle equipped with a hybrid drive including an internal combustion engine and at least one electric motor, the vehicle being able to be driven also by an electric motor exclusively, the gas transport for calibrating the signal of the exhaust gas probe or the fuel dosing device is induced by an engine drag operation of the vehicle, in which the internal combustion engine is dragged by the at least one electric motor while the fuel supply is deactivated.

Abstract: In a method for calibrating a measuring signal of an exhaust gas probe or a control signal of a fuel dosing device of a vehicle equipped with a hybrid drive including an internal combustion engine and at least one electric motor, the vehicle being able to be driven also by an electric motor exclusively, the gas transport for calibrating the signal of the exhaust gas probe or the fuel dosing device is induced by an engine drag operation of the vehicle, in which the internal combustion engine is dragged by the at least one electric motor while the fuel supply is deactivated.

Abstract: A method and a device for monitoring gas sensors in an internal combustion engine, in which in a steady-state operation of the internal combustion engine, the output signal of the gas sensor is filtered by a high-pass filter and higher-frequency signal components are analyzed by a comparison with an appropriately processed model value. When using the method and the device for executing the method, electrically oscillating gas sensors or the incoupling of interference variables or faults in the evaluation circuit, especially in the case of exhaust gas sensors in an exhaust-gas purification and reducing system, are able to be detected, which minimizes faulty interpretations in a dynamic diagnosis. This monitoring function is advantageously combinable with dynamic diagnosis functions that likewise analyze higher-frequency signal components by a comparison with appropriately processed model values. This increases the operational reliability of the exhaust-gas purification or reducing system.

Abstract: In a method for dynamic monitoring of gas sensors of an internal combustion engine, in the event of a change of the gas state variable to be measured, a dynamic diagnosis is carried out based on a comparison of a measured signal which is an actual value of an output signal of the gas sensor and a modeled signal which is a model value. The output signal of the gas sensor is filtered using a high-pass filter and higher-frequency signal components are analyzed.

Abstract: In a method for determining a dead time in the response characteristic of an exhaust gas sensor in order to determine an exhaust gas state quantity in an exhaust gas duct of an internal combustion engine, the dead time is determined from a measured output signal of the exhaust gas sensor and a comparison signal. An undelayed comparison signal is determined, and a cross-correlation is formed between the measured output signal and the comparison signal delayed by a model dead time selected in such a way that the cross-correlation function assumes a maximum, and the dead time of the measured output signal is set equal to the selected model dead time.

Abstract: A method for operating an internal combustion engine. The internal combustion engine has at least one cylinder, to which are connected an intake manifold having an air mass sensor, an exhaust pipe having a ?-sensor and an exhaust gas recirculation line having an exhaust gas recirculation valve. The air mass sensor generates an air mass sensor signal. The ?-sensor generates a ?-sensor signal. The exhaust gas recirculation valve is adjusted by a control signal. A setpoint injection quantity is formed and the control signal of the exhaust gas recirculation valve is formed as a function of the air mass sensor signal. An air mass replacement signal for the air mass sensor signal is formed as a function of the ?-sensor signal and the setpoint injection quantity. In the case of a faulty air mass sensor signal, the control signal is formed as a function of the air mass replacement signal.

Abstract: A device and a method for controlling an internal combustion engine are provided, in which the fuel quantity to be injected is controlled as a function of a Lambda signal. A setpoint value for the Lambda signal is specified on the basis of at least one maximally permitted exhaust-gas temperature value.

Abstract: The invention concerns a procedure and a device for an adaptation of a dynamic model of an exhaust gas probe, which is a component of an exhaust pipe of a combustion engine and with which a lambda value is determined for regulating an air-fuel composition, whereby a simulated lambda value is calculated parallel to that in a control unit or in a diagnosing unit of the combustion engine and an application function uses the simulated and the measured lambda value. According to the invention it is thereby provided that a jump behavior of the exhaust gas probe is determined during a running vehicle operation by evaluating a signal change at a stimulation of the system and that the dynamic model of the exhaust gas probe is adapted with the aid of these results.

Abstract: A method for performing a diagnostic on an exhaust gas analyzer probe disposed in the exhaust system of an internal combustion engine, and a device for implementing the method are provided. The method performs the evaluation of the exhaust gas analyzer probe after recognition of a special operating phase, e.g., an overrun phase, of the internal combustion engine by setting off a specifiable injection that is torque-neutral or not perceptible for the operator, on the basis of the predicted probe signal pattern and taking into account the delay time of the probe signal.

Abstract: The invention relates to a method for monitoring dynamic characteristics of a broadband lambda probe (25), wherein a measured lambda signal corresponding to an oxygen concentration in the exhaust gas of an internal combustion engine (1) is determined using a broadband lambda probe (25), wherein an observer producing a modeled lambda signal from input variables is associated with the internal combustion engine (1), and wherein an estimation error signal is formed from the difference of the modeled lambda signal and the measured lambda signal or from the difference of signals derived therefrom as an input variable of a controller (14) connected upstream of a model (15) in the observer (10).

Abstract: A device and a method for controlling an internal combustion engine are provided, in which the fuel quantity to be injected is controlled as a function of a Lambda signal. A setpoint value for the Lambda signal is specified on the basis of at least one maximally permitted exhaust-gas temperature value.

Abstract: A method for performing a diagnostic on an exhaust gas analyzer probe disposed in the exhaust system of an internal combustion engine, and a device for implementing the method are provided. The method performs the evaluation of the exhaust gas analyzer probe after recognition of a special operating phase, e.g., an overrun phase, of the internal combustion engine by setting off a specifiable injection that is torque-neutral or not perceptible for the operator, on the basis of the predicted probe signal pattern and taking into account the delay time of the probe signal.