Robert Boschgmbh

Johannes Georg Mueller

Sebastian Gepperth

Roland Waschler

The invention proposes a method for operating a metering system () with a plurality of metering valves () for an SCR catalyst system, in which opening times for the injection of reducing agent are calculated for the metering valves () based on a metering amount requirement. In the calculations of the opening times, a metering-valve-specific adaptation factor is used, w herein a deviation (&#x394;p) of a system pressure (p) in the metering system () from a target pressure (p) and a weighting factor are used for calculation of the metering-valve-specific adaptation factor. The weighting factor depends on a proportion (r, r) of the required metering amount ((formula (I)), (formula (II)) of the respective metering valve () in relation to a total metering amount ((formula (I)), (formula (II)) of all metering valves ().

Method for operating a system with a plurality of metering valves

A method for identifying deviations in quantity in the case of a fluidic metering system (-), in particular an internal combustion engine of a motor vehicle, in which at least one conveying pump () for conveying a fluid, and at least one pressure sensor () for determining a fluidic pressure in the metering system (-), are disposed, wherein it is provided in particular that a test admeasurement of fluid is carried out (), that a temporal pressure drop in the metering system (-) is detected (), that the detected temporal pressure drop is compared with a pressure drop () that is to be theoretically expected (), and that a deviation in quantity of the metering system (-) is determined based on the result of the comparison ().

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Ludwigsburg, Germany

Johannes Georg Mueller