Robert Boschgmbh

Andreas Michalske

Thomas Bleile

Thomas Zein

Thomas Steinert

Christian Horn

Thomas Kirstaetter

Sascha-Juan Moran Auth

Manfred Birk

Dirk Samuelsen

Bernhard Ledermann

Frank Mueller

Andreas Rupp

Richard Holberg

Shuwen Ling

Benedikt Kraus

Ralf Knitz

Bernhard Matrohs

Klaus Theiss

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.

Method and device for dynamic monitoring of an air charging system of an internal combustion engine

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.

Method and device for dynamic monitoring of gas sensors

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.

Method and device for monitoring gas sensors

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 Oconcentration 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.

Method and device for determining the lambda value with a broadband lambda sensor of an internal combustion engine, particularly of a motor vehicle

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.

Method and control unit for determining a dead time of an exhaust gas sensor of an internal combustion engine

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 &#x3bb;-sensor and an exhaust gas recirculation line having an exhaust gas recirculation valve. The air mass sensor generates an air mass sensor signal. The &#x3bb;-sensor generates a &#x3bb;-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 &#x3bb;-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.

Method for operating an internal combustion engine

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.

Method for calibrating exhaust gas probes and fuel dosing devices in a hybrid vehicle

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.

Method and device for controlling an internal combustion engine

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.

Procedure and device for an adaptation of a dynamic model of an exhaust gas probe

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.

Method for performing a diagnostic on an exhaust gas analyzer probe disposed in the exhaust system of an internal combustion engine and device for implementing the method

A procedure for the calibration of the lambda measuring signal supplied by the wideband lambda sensor, which is disposed in the exhaust gas area of an internal combustion engine, and a device to implement the procedure are proposed. During the procedure, a correction value is used to ascertain a unit of measurement for the lambda actual value, whereby the correction value is ascertained during a specified operating state of the internal combustion engine, in which no fuel metering occurs and the engine rotational speed of the internal combustion engine lies above a threshold value. The correction value&#x2014;is ascertained as a function of the sensor temperature of the wideband lambda sensor during a specified operating state.

Procedure to calibrate a signal supplied by a lambda sensor and device to implement the procedure

A method and device for controlling an internal combustion engine, in which the fuel quantity to be injected into the engine is limited to a limiting value. The limiting value is predefined on the basis of the output signal of a closed-loop controller or an open-loop controller and a precontrol value. Furthermore, the precontrol value is corrected.

A method and device for controlling an internal combustion engine are provided. A first quantity characterizing the actually injected fuel amount and a second quantity characterizing the desired amount of fuel to be injected are determined on the basis of performance characteristics. The first quantity is compared to the second quantity. This comparison is used to define a first correction value for correcting a fuel amount and a second correction value for correcting an air amount. The first correction value is limited to a maximum value.

An internal combustion engine, in particular for a motor vehicle, is described. The internal combustion engine is provided with a control unit for determining a setpoint fuel mass and/or a setpoint air mass as a function of a setpoint torque. The control unit is also provided for transitioning from a first operating mode to a second operating mode of the internal combustion engine. An actual torque is determined by the control unit during the transition to the second operating mode of the internal combustion engine. A torque difference between the setpoint torque and the actual torque is also calculated by the control unit. Finally, the setpoint fuel mass and/or the setpoint air mass is controlled by the control unit as a function of the torque difference.

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Kornwestheim, Germany

Andreas Michalske