Robert Boschgmbh

Thomas Farr

Claus Linsenmaier

Horst Wagner

Rolf Maier-Landgrebe

Daniel Kuhn

Pandurang Jadhav

Yihao Zhu

A method for averaging pulsating measurement quantities is disclosed. First, time-discrete measurement values () of the measurement quantity are recorded. Subsequently, first filtering of the measurement values () is carried out with a first filter time constant, during which a first signal () is obtained, and second filtering of the measurement values () with a second filter time constant, during which a second signal () is obtained, the second filter time constant being greater than the first filter time constant. Intersection points (), at which the first signal () and the second signal () intersect, are then determined. Lastly, the arithmetic mean of the measurement values () between the intersection points () is taken.

Method for averaging pulsating measurement quantities

A method for monitoring the volumetric flow of a metering valve () of a fluidic metering system () of an internal combustion engine, in which at least one feed pump () for feeding a fluid is arranged, the feed pump () being connected to a feed line () and to a return line (), and it being provided in particular that an inner leakage of the feed pump () is determined and that the volumetric flow of the metering valve () is monitored on the basis of ascertained () pressure values on the basis of the determined inner leakage of the feed pump ().

Method for monitoring the volumetric flow of a metering valve of a fluidic metering system of an internal combustion engine, in particular of a motor vehicle

A method for detecting a dosing error of a reduction agent in a dosing module of an SCR catalytic converter system. The SCR catalytic converter system comprises the dosing module, which has a dosing valve and a flow valve as well as a delivery module with delivery pump. The SCR catalytic converter system, furthermore, has a return, in which a further flow valve is arranged. Said flow valve changes an effective cross-sectional area of the return. The method herein comprises the following steps: at the beginning, the dosing valve is closed (). At a first pressure value (p) in the system the delivery pump is switched off () and a measurement () of a first pressure rate () of the flow valve of the return subsequently takes place. Additional operation of the pump and the dosing valve occurs and a ratio of pressure rates is determined.

Methods for detecting a dosing error

The invention relates to an expansion body having an equalization chamber, which is separated by an elastic diaphragm from a fluid which flows through part of the expansion body. A mechanical spring applies an additional spring force to the diaphragm, wherein the spring has mechanical prestress. In addition, the invention relates to an SCR system with such an expansion body, and a method for monitoring a pressure sensor in such a SCR system with an expansion body. The method comprises the following steps: first, an anticipated characteristic pressure at which the spring force of the spring of the expansion body is overcome is defined by setting the prestress of the spring in the expansion body.

Expansion body and method for monitoring a pressure sensor in a SCR system with an expansion body

A method is provided for identifying an averaged sensor value of a state variable of an air system for an internal combustion engine in a motor vehicle, comprising the following steps:

Method and apparatus for furnishing a filtered air system state variable in a control unit of an internal combustion engine

A method for controlling an internal combustion engine in which each cylinder of the internal combustion engine is assigned at least one system deviation and at least one controller, each controller predefining a cylinder-specific control signal on the basis of the assigned system deviation, is characterized in that at least one first controller which predefines the control signal as a function of at least one signal characterizing the rotational speed of the internal combustion engine is provided, and at least one second controller which predefines the control signal as a function of at least one signal characterizing the exhaust-gas composition is provided; and, as a function of at least one operating parameter characterizing the operating state of the internal combustion engine, the control signal is predefined either by the at least one first or the at least one second controller or by a combination of a control signal generated by the at least one first controller and a control signal generated by the at least one second controller.

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Ludwigsburg, Germany

Thomas Farr