Patent application number | Description | Published |
20090188252 | METHOD AND APPARATUS FOR INCREASING THE EXHAUST GAS TEMPERATURE OF AN INTERNAL COMBUSTION ENGINE - The invention relates to a method and an apparatus for temporarily increasing the temperature in the exhaust gas of an internal combustion engine, comprising at least two associated turbochargers with a respective compressor in a fresh air feed to the internal combustion engine and a respective turbine in an exhaust gas line of the internal combustion engine, wherein a bypass is assigned to at least one compressor and/or one turbine, and comprising at least one exhaust gas retreatment system connected downstream of the turbines in the exhaust gas direction. In this case, the volumetric flow of fresh air and/or of exhaust gas directed past at least one compressor and/or one turbine through the bypasses is increased via regulating elements in the bypasses, which leads to a reduction in the charge pressure and hence to a reduction in the efficiency of the internal combustion engine and to an increase in the exhaust gas temperature. | 07-30-2009 |
20100242584 | METHOD FOR OPERATING A SENSOR - A method for operating a sensor in an exhaust gas tract of an internal combustion engine and a device for carrying out the method are provided. In the method, a diagnosis is carried out of the condition of the saturation temperature, exclusively while taking into consideration a few fundamental input variables characterizing the operating state of the internal combustion engine. | 09-30-2010 |
20110078998 | METHOD FOR OPERATING AN EXHAUST GAS AFTERTREATMENT APPARATUS - The present invention relates to a method for operating an exhaust gas aftertreatment apparatus ( | 04-07-2011 |
20110099981 | PROCEDURE AND DEVICE FOR CONTROLLING AN EXHAUST GAS PURIFICATION SYSTEM - A procedure for controlling an exhaust gas purification system of a combustion engine, consisting of one or several catalytic converters for converting and/or storing at least one exhaust gas component of an exhaust gas of the combustion engine at least one of the catalytic converters is construed as oxidization catalytic converter. With the aid of the adsorption capability of at least partially uncombusted hydrocarbons of one of the catalytic converters a diagnosing forecast about the NO oxidization of the catalytic converters is derived, whereby the at least partially uncombusted hydrocarbons are introduced into the exhaust gas duct at least partially in front of the catalytic converter. With the procedure and the device for implementing the procedure the NO oxidization capability of the involved catalytic converters can be evaluated in the range of extended on-board diagnosis requirements to provide “feed-gas” for subsequent exhaust gas after-treatment systems. | 05-05-2011 |
20110130917 | METHOD FOR ACQUIRING INFORMATION - A method for acquiring information from a driving operation of a vehicle, in which first information is acquired with respect to at least one operating state of the vehicle and additional second information is ascertained with respect to this at least one operating state using statistical methods, the first and second information concerning this at least one operating state being stored. A method for the assigning and diagnosis of at least one operating state of a vehicle, a control unit, a computer program and a computer-program product are also provided. | 06-02-2011 |
20110146239 | METHOD FOR MONITORING A POLLUTANT CONVERSION CAPACITY IN AN EXHAUST GAS AFTERTREATMENT SYSTEM - The present invention relates to a method for monitoring a pollutant conversion capacity of a catalytically coated, oxidizing exhaust gas aftertreatment component ( | 06-23-2011 |
20110232363 | PROCESS FOR MONITORING THE FUNCTION OF A PARTICULATE FILTER - A process for monitoring a conversion capacity of a particulate filter arranged in an exhaust gas duct of an internal combustion engine to oxidize nitrogen monoxide to nitrogen dioxide over a catalytic coating includes determining a flow resistance of the particulate filter and setting a temperature of the exhaust gas upstream of the particulate filter. A threshold for a change in the flow resistance of the particulate filter is defined. The monitoring process determines that inadequate conversion capacity of the catalytic coating of the particulate filter is reached when a change in the flow resistance of the particulate filter does not reach the defined threshold within a given period of time. | 09-29-2011 |
20110296905 | METHOD FOR MONITORING AN SCR CATALYTIC CONVERTER - A method is provided for monitoring an SCR catalytic converter ( | 12-08-2011 |
20120060476 | METHOD FOR MONITORING THE POLLUTANT COVERSION CAPACITY IN AN EXHAUST GAS AFTER-TREATMENT SYSTEM - A method for monitoring a pollutant conversion capacity of a catalytically coated, oxidizing exhaust gas after-treatment component in an exhaust gas system of an internal combustion engine, wherein a capacity of the catalytic coating of the exhaust gas after-treatment component for oxidizing NO to NO | 03-15-2012 |
20120191320 | METHOD FOR MONITORING THE ENABLING OF A SYSTEM - A method for monitoring the enabling of a system which is assigned to an internal combustion engine, in which the readiness for operation of the system is dependent on an operating temperature, is characterized in that a fault in the enabling of the system is inferred ( | 07-26-2012 |
20120222401 | METHOD FOR OPERATING AN EXHAUST SYSTEM OF AN INTERNAL COMBUSTION ENGINE - A method for operating an exhaust system of an internal combustion engine, wherein nitrogen oxide (NO | 09-06-2012 |
20120255280 | METHOD FOR MONITORING A CATALYTIC CONVERTER - A method for monitoring the capability of a catalytic converter to convert nitrogen monoxide into nitrogen dioxide in the exhaust gas of an internal combustion engine, the catalytic converter being arranged in an exhaust gas duct of the internal combustion engine and the catalytic converter being followed downstream by a collecting particle sensor. It is in this case provided that, in a monitoring cycle, a decrease in the particle loading of the particle sensor during the operation of the internal combustion engine under predetermined operating conditions is taken to conclude an adequate capability of the catalytic converter to convert from nitrogen monoxide to nitrogen dioxide. | 10-11-2012 |
20130144505 | METHOD FOR OPERATING AN EXHAUST GAS SYSTEM OF AN INTERNAL COMBUSTION ENGINE - A method for operating an exhaust gas system of an internal combustion engine is described, wherein NOx is reduced by means of a SCR catalyst and a NOx reduction capability of an aqueous urea solution to be introduced into the exhaust gas system is monitored, and wherein at least one first variable characterizing the ammonia content of the water is ascertained and an ageing of the aqueous urea solution is inferred from said first variable. | 06-06-2013 |
20130202506 | METHOD FOR MONITORING AN SCR CATALYST - In a method for monitoring an SCR catalyst, in particular for monitoring the storage capacity of the SCR catalyst for ammonia, superstoichiometric metering ( | 08-08-2013 |
20130276429 | METHOD FOR DIAGNOSING A METERING VALVE AND DEVICE FOR CARRYING OUT THE METHOD - A method for diagnosing a metering valve for metering a reagent into the exhaust gas region of an internal combustion engine. The metering valve is actuated by a pulse-width-modulated metering valve actuation signal with a certain duty factor for setting the metering rate. A reagent pump places the reagent at a reagent pressure, and the reagent pump is operated with a pulse-width-modulated pump actuation signal with a certain duty factor. Diagnosis of the metering valve is carried out on the basis of an evaluation of the increase in the metering valve actuation signal pulse duty factor after a predefined increase in the metering rate. The reagent filling level of an SCR catalytic converter arranged in the exhaust gas region is taken into account. At the start of the diagnosis, the reagent storage capacity of the SCR catalytic converter is checked. | 10-24-2013 |
20140245822 | METHOD AND DEVICE FOR MONITORING A NITROGEN OXIDE STORAGE CATALYTIC CONVERTER - A method for monitoring a nitrogen oxide storage catalytic converter (NSC) in the exhaust gas duct of an internal combustion engine which is operated at least temporarily in a lean fashion, wherein during a lean mode of the internal combustion engine nitrogen oxides from the exhaust gas are stored by the nitrogen oxide storage catalytic converter, wherein during a regeneration phase of the nitrogen oxide storage catalytic converter the internal combustion engine is operated in a rich fashion, and as a result the nitrogen oxides stored in the nitrogen oxide storage catalytic converter are removed, and wherein an exhaust gas component or exhaust gas characteristic variable which is characteristic of the profile of the regeneration is detected during the regeneration phase by means of an exhaust gas probe. | 09-04-2014 |