Daimler Chrysler Ag

Daimler Ag

Daimler-benz Ag

Mercedes-benz Aktiengesellschaft

Michael-Rainer Busch

Hans-Dieter Schuster

Jorg Abthoff

Carsten Plog

Ralf Moos

Gunter Loose

Aleksandar Knezevic

Axel Hirschmann

Andreas Miksch

Dirk Herbstritt

Klaus Binder

Tillmann Braun

Uwe Hofmann

Gottfried Wollenhaupt

Friedhelm Nunnemann

Uwe Kleinecke

Michael Osswald

Markus Fortkord

Klaus-J&uuml;rgen Marquardt

Gerd Gund

An exhaust gas purification system for an internal combustion engine of a motor vehicle is provided. The system includes a first particulate filter element and a second particulate filter element, which is connected downstream of the first particulate filter element and through which flows the exhaust gas that emanates from the first particulate filter element. The first particulate filter element operates as a system filter and the second particulate filter element operates as a diagnostic filter. A charge of the diagnostic filter can be determined, and the functional capability of the system filter can be deduced based thereon.

Exhaust gas purification system for an internal combustion engine

In an operating and diagnostic method for an SCR exhaust gas aftertreatment system which has an SCR catalytic converter with ammonia storage capacity, a signal of an exhaust gas sensor that is sensitive to nitrogen oxide and ammonia and is arranged downstream of the SCR catalytic converter, is measured. In a normal operating mode, ammonia is supplied to the SCR catalytic converter corresponding to a filling level model for ammonia stored in the SCR catalytic converter, in such a way that the ammonia filling level of the SCR catalytic converter is held at least approximately at a predefinable nominal value (or value range). The normal operating mode is interrupted if an exhaust gas sensor signal that exceeds a predefinable first limit value, is registered, and the set urea dosing rate is increased by a predefinable degree in relation to the value provided in the normal operating mode. Thereafter, a return is made to the normal operating mode, or a switch is made to a diagnostic operating mode, as a function of the profile of the signal of the exhaust gas sensor.

Operating and diagnostic method for an SCR exhaust-gas aftertreatment system

Method of detecting an unauthorized exchange of components in the case of a technical system, where the control unit () sends an encoded message () to a component () to be checked, in a data field of the message () a randomly generated or not easily reproducible value () being entered, which is used for checking the installed component (). The component () accesses an assignment field () and, as a result, assigns an identification () to each not easily reproducible or random value () transmitted together with the message (), and the component () transmits the identification corresponding to the value () back to the control unit (). The control unit () decides on the basis of the identification () whether the component () is that the component () which is authorized for use in the particular technical system.

Process for detecting defective component exchanges

A method and apparatus for detecting the presence of a prescribed heat exchanger, such as a catalytically active radiator, in a motor vehicle are performed during operation of the motor vehicle. The temperature of a heat-exchanger medium is observed together with further current operationally relevant parameters of the motor vehicle for a prespecified time window. An expected temperature gradient over time of the heat-exchanger medium is detected, as well as the current temperature gradient over time of the temperature of the heat-exchanger medium. The presence of a prescribed heat exchanger is detected taking into account the expected temperature gradient and the current temperature gradient.

Method and apparatus for detecting the presence of a prescribed heat exchanger

The invention relates to an internal combustion engine which has charge-air supercharging by means of an exhaust-gas turbocharger and secondary air injection, the flow path of which is selected in such a way that the quantity of secondary air injected has an influence on the rotational speed of the turbocharger. By monitoring the rotational speed of the turbocharger, an increase in the rotational speed caused by the secondary air injection is determined, and the quantity of secondary air injected is worked out from the increase in rotational speed. This has the advantage that there is no need for complex temperature-measuring methods as have hitherto been employed. Rotational speed measurement can be carried out contactlessly and with absolutely no wear in particular by means of inductive rotational-speed sensors. Moreover, these inductive rotational-speed sensors can be miniaturized and produced at extremely low cost.

Internal combustion engine with exhaust-gas turbocharger and secondary air injection

Device and method for determining the state of ageing of an exhaust-gas catalytic converter wherein an oxygen sensor having an oxygen-sensitive region and a temperature-sensitive region can be actuated in such a manner that a temperature measurement and, as an alternative, an oxygen partial pressure measurement can be carried out. There is provision for an electrical conductivity of a conductor structure of the oxygen sensor to be determined and for an exhaust-gas temperature to be determined therefrom. From the sensor measurements, the extent of exhaust gas catalytic converter ageing may be assessed.

Device and method for determining the state of aging of an exhaust-gas catalytic converter

Device and method for determining the state of ageing of an exhaust-gas catalytic converter

A system is provided for measuring gaseous constituents of a flowing gas mixture, having a gas flow control device and at least one sensor which is in contact with the flowing gas mixture. At least one mixing device is placed in the flow of the gas mixture, which mixing device homogenizes the gas mixture to mixed gas before it is detected by the sensor. The system is adapted for use in exhaust gas systems of internal-combustion engines.

Sampling system for exhaust gas sensors and method of using same

A method for determining the storage state of an ammonia-storing SCR catalyst, the change in at least one physical property of the SCR catalyst material, changing with the NH storing process, being sensed, the measurement taking place on the SCR catalyst material itself by applying a measuring pickup to the SCR catalyst or bringing it into direct contact with the latter and determining the storage state on the basis of these results. In an alternative embodiment, a material identical or similar to the SCR catalyst material with regard to its physical properties is arranged in the exhaust-gas stream in addition to the SCR catalyst material, and the change in at least one physical property of this substitute material changing with the NH storing process, is sensed, the measurement taking place on the substitute material itself by applying the substitute material to the measuring pickup or bringing it into direct contact with the latter and determining the storage state of the SCR catalyst on the basis of these results.

Method and apparatus for determining the storage state of an ammonia-storing SCR catalyst

A method for determining the fullness or the quality of a catalytic converter that stores gases in a storage medium includes the steps of measuring a change in at least one physical property of the storage medium that changes with the storage process, and determining the fullness or the quality of the catalytic converter.

Method for determining the fullness or quality of a catalytic converter that stores gases

The invention provides a method of checking for correct connection of lambda sensors in an internal combustion engine with one or more cylinder groups that incorporates an engine control and a plurality of lambda sensors, with a separate exhaust line with an exhaust catalytic converter and at least one lambda sensor with a lambda-regulating unit connected thereto being associated with each group of cylinders. While retaining the injection of an ignitable mixture at the beginning of a delay time that includes at least the reaction or switching time of the lambda sensors in its current regulating state, the engine control adjusts the lambda-regulating unit of at least one cylinder group, toward rich or lean engine operation and/or suspends its regulating function during the delay. The signal from the lambda sensor intended for use with the selected cylinder group is investigated to determine whether it shows a reaction that is associated with the manipulation performed and indicates a correct connection of this lambda sensor.

Method for testing correctly connected lambda sensors

The quality of the external air is determined by means of a pollutant sensor. The quality of the internal air is determined by calculation taking account of the air quantities introduced from outside into the internal space. A decision between air supply operation and air recirculation operation is then made on the basis of a comparison of the air qualities inside and outside. The pollutant sensor is preferably located in a casing whose internal space is accessible to gases through an opening which is preferably sealed by a gas-permeable membrane.

Device for controlling the ventilation of an internal space,

A method for testing and adjusting catalytic exhaust gas emission control systems of internal combustion engines, in which the fuel-air-ratio is regulated by means of a .lambda.-probe (control-probe) arranged in the exhaust gas stream upstream of the catalyst, whereby the exhaust gas stream is measured downstream of the catalyst by means of a further .lambda.-probe (test-probe). The voltage average value and amplitude magnitude of the signal produced by the test-probe are determined and serve for adjusting the operating point of the control system and for the recognition of the catalyst efficiency.

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Ebersbach, Germany

Michael-Rainer Busch