Continental Automotive Gmbh

Vitesco Technologies Gmbh

Siemens Aktiengesellschaft

Audi Ag

Siemens Vdo Automotive Ag

Schaeffler Technologies Ag & Co .kg

Paul Rodatz

Michael Nienhoff

Gerhard Haft

Hong Zhang

Gerd Rösel

Manfred Weigl

Erwin Achleitner

Andreas Wildgen

Stephan Heinrich

Rudolf Bierl

Wolfgang Mai

Gerald Rieder

Tino Arlt

Florian Kleiner

Sebastian Viehöver

Hao Chen

Peter Hirth

Gerhard Eser

Dirk Baranowski

Norbert Sieber

Holger Stock

Carlos Eduardo Migueis

Jan-Richard Lenk

Ingo Koops

Sebastian Viehoever

Philipp Langenfeld

Thomas Schoen

Thorsten Rosenkranz

Sebastian Viehöyer

Fabian Fink

Various embodiments include a method for monitoring the ventilation of a crankcase of an internal combustion engine with combustion chambers and a nitrogen oxide sensor arranged in an exhaust system, the sensor configured to detect an amount of nitrogen oxide in exhaust gas of the internal combustion engine. An example method includes: determining a predefined operating mode of the internal combustion engine defined by substantially no combustion of an air/fuel mixture taking place inside the combustion chambers; determining an amount of nitrogen oxide in the exhaust gas during the predefined operating mode of the internal combustion engine using the exhaust gas sensor; and identifying functional ventilation of the crankcase if the detected nitrogen oxide level exceeds a predefined nitrogen oxide threshold or identifying a malfunction if the detected nitrogen oxide level is below the predefined nitrogen oxide threshold.

Monitoring the ventilation of a crankcase of an internal combustion engine

A device for the aftertreatment of exhaust gases from an exhaust-gas source, having a spatially delimited flow path through which flow may pass proceeding from the exhaust-gas source, having a heating catalytic converter which is arranged in the flow path and which, as viewed in a flow direction, firstly has a catalytically active catalytic converter through which flow may pass and, following this in the flow direction, has an electrically heatable heating disk, wherein at least one outlet of a secondary air supply is arranged in the region of the heating catalytic converter such that a gas flow referred to as secondary air is fed into the flow path in the region of the heating catalytic converter.

Exhaust gas aftertreatment device

Various embodiments of the teachings herein include a method for determining the nitrogen oxide content and/or ammonia content in the exhaust gas of an internal combustion engine with a catalytic converter arranged in an exhaust tract and an exhaust gas sensor downstream of the catalytic converter. In some embodiments, the method comprises: determining an operating state of the internal combustion engine, the operating state indicating either lean operation or rich operation of the internal combustion engine; generating a signal using the exhaust gas sensor; and determining the nitrogen oxide content and/or ammonia content in the exhaust gas at least partially based on the determined operating state of the internal combustion engine and the signal.

Method for ascertaining the nitrogen oxide fraction and/or ammonia fraction in the exhaust gas of an internal combustion engine

Various embodiments include a method of ascertaining the oxygen load of a catalytic converter disposed in an exhaust tract of an internal combustion engine with an exhaust gas sensor is disposed downstream of the catalytic converter comprising: generating a signal using the exhaust gas sensor indicating a proportion of nitrogen oxide and/or ammonia in the exhaust gas; and ascertaining the oxygen load of the catalytic converter at least partly on the basis of the signal from the exhaust gas sensor.

Method for determining the oxygen load of a catalytic converter of an internal combustion engine, and exhaust system of an internal combustion engine

Determining the presence of a particle filter in the exhaust gas tract of an engine, with the steps of determining a first exhaust gas temperature curve which occurs in the exhaust gas tract upstream of the particle filter; measuring a second exhaust gas temperature curve by a first temperature sensor arranged downstream of the particle filter; determining a first heat quantity by integration over a specific time of a first heat flow curve determined by a first exhaust gas mass flow, a first specific heat capacity and the first exhaust gas temperature curve; determining a second heat quantity by integration over the specific time of a second heat flow curve determined by a second exhaust gas mass flow, a second specific heat capacity and the second exhaust gas temperature curve, evaluating the first heat quantity and the second heat quantity to determine the presence of the correct particle filter.

Method and device for diagnosis of a particle filter arranged in the exhuast gas system of a petro-operated internal combustion engine

An internal combustion engine makes available exhaust gas which can be treated by means of a catalytic converter and a particle filter. A method for determining the particle load of the particle filter comprises steps of determining the storage capacity of the catalytic converter for oxygen and determining the particle load of the particle filter on the basis of the determined storage capacity in the controller.

Exhaust gas treatment for an internal combustion engine

The present disclosure describes a method for checking the signal of a temperature sensor in an exhaust-gas aftertreatment system for an internal combustion engine. The method may include: in an operating state which does not require heating of the reducing agent, activating the heating device for the purposes of checking the temperature sensor; determining whether the signal of the temperature sensor changes by a predefined expected value (&#x394;T) within a predefined time period (&#x394;t); provisionally identifying the temperature sensor as fault-free if it does; deactivating the heating device; determining whether the signal of the temperature sensor reaches the start temperature (T) again within a time period (&#x394;t); and confirming the temperature sensor as fault-free if it does.

Method for checking a temperature sensor in an SCR exhaust gas post-treatment system

The present disclosure relates to engines for a motor vehicle and some embodiments include a method for operating an exhaust train of a motor vehicle engine including: measuring a particle concentration downstream of a particle filter at a first operating point; determining the filter efficiency at the first operating point; changing operation of the engine to a second operating point to increase the particle emissions; measuring the particle concentration downstream of the filter at the second operating point; determining the filter efficiency at the second operating point; determining a difference between the efficiency levels; detecting an offset error, if the difference exceeds a defined threshold; and identifying a particle sensor as defective if an offset error is detected, rather than identifying the particle filter as defective.

Exhaust system for a motor vehicle

A method for determining the composition of a fuel in a lubricant in an internal combustion engine in disclosed. The composition of a fuel having at least a first portion of a first fuel component and a second portion of a second fuel component is predefined. The mass flow with which the fuel is introduced into the lubricant in an introduction phase or discharged from the lubricant and from the housing in a discharge phase is determined. The composition of the mass flow is determined from a first mass flow of the first fuel component and a second mass flow of the second fuel component, which are determined based on a) an introduction parameter in the introduction phase or a discharge parameter in the discharge phase, and b) the first portion of the first fuel component and the second portion of the second fuel component in the fuel.

Modeling oil dilution using a multicomponent model

A method for checking the leak-tightness of hydraulic components in an exhaust gas aftertreament unit of an internal combustion engine is disclosed. The exhaust gas aftertreament unit uses an electric motor to pump a liquid reductant from a reductant reservoir to a reductant injector that is kept closed. The reductant pump is switched on for a first predetermined period, and the electric current consumed by the electric motor is detected during this period. After a predetermined standstill time has passed, the reductant pump is switched on again for a second period identical to the first period, and the electric current consumed by the electric motor is again detected during this period. The electric currents detected during the two time periods are compared with each other, and the leak-tightness of the hydraulic components downstream of the reductant pump is evaluated based on the result of the comparison.

Method and device for checking the hydraulic leak-tightness in an exhaust gas aftertreatment system for a motor vehicle

A control unit and a method for checking the outgassing of fuel from the lubricant of an internal combustion engine are provided, wherein, in a first method step, the outgassing of fuel from the lubricant is estimated on the basis of at least one operating parameter using a theoretical model during the normal operation of the internal combustion engine, and wherein, after the estimation of defined outgassing of fuel on the basis of the model, the outgassing of fuel is estimated in a second method step on the basis of at least one further operating parameter during a defined operating state.

Method for checking the outgassing of fuel and control unit

An internal combustion engine has an exhaust gas sensor upstream of or in an exhaust gas catalytic converter, and having a measurement signal corresponding to a residual oxygen content of the exhaust gas flowing past the exhaust gas sensor. For operation, an air ratio is specified, a specified forced stimulation is applied thereto, and at least one actuator that influences the mixture is set by appropriately controlling the actuator. In correlation with a rising edge of the forced stimulation, a first maximum value of the air ratio is determined according to the signal profile of the exhaust gas sensor measurement signal during a first measurement duration, and a second maximum value of the air ratio is determined according to the exhaust gas sensor measurement signal during a subsequent second measurement duration. A first sensor characteristic value is determined based on the first and second maximum values.

Method and device for operating an internal combustion engine

A method is provided for checking the functional capacity of a liquid-cooled exhaust manifold of an internal combustion engine, having an exhaust line connected to the exhaust manifold, in the course of which an exhaust gas sensor having an electrical heater is arranged. During the operation of the internal combustion engine, the electrical resistance of the exhaust gas sensor is determined, on the basis of which the current value of the exhaust gas temperature is evaluated, and compared to a target value of the exhaust gas temperature, which is expected at this point in the operation of the internal combustion engine. Depending on the result of the comparison, the functional capacity of the liquid-cooling of the exhaust manifold is estimated.

Method for diagnosing a liquid-cooled exhaust manifold of an internal combustion engine

In a method and apparatus for operating an internal combustion engine, a lambda control is carried out, in which a trim regulation is provided, which operates with a P regulator component and an I regulator component. To prevent overshooting when the trim regulation is carried out, operation takes place in a first mode with compulsory adjustment and in a following second mode with increased regulator amplification factors.

Method and apparatus for operating an internal combustion engine

A method is disclosed for operating an exhaust gas catalytic converter designed to reduce nitrogen oxides in an exhaust gas flow using a solution that contains urea and that reacts to form at least ammonia in the exhaust gas flow. The method may include: introducing an amount of the solution containing urea upstream of the exhaust gas catalytic converter until an ammonia slip through the exhaust gas catalytic converter; determining a first actual value of the loading state of the catalytic converter with ammonia at the time of the slip; determining a first estimated value of the loading state at the time of the slip by means of a dynamic model for the loading; subsequently draining the ammonia from the catalytic converter; determining a second actual value of the loading state of the exhaust gas catalytic converter with the solution containing urea when the catalytic converter is drained as specified.

Growing community of inventors

Landshut, Germany

Paul Rodatz