Robert Boschgmbh

Christian Fleck

Thomas Bleile

Alexandre Wagner

Slobodanka Lux

Axel Aue

Wolfgang Fischer

Tobias Lang

Tobias Pfister

Heiner Markert

Andre Guntoro

Andreas Kugi

Matthias Schreiber

Nico Bannow

Felix Streichert

Michael Hanselmann

Arthur Bastoreala

Ulrich Schulmeister

Adrian Trachte

Matthias Bitzer

Michael Saetzler

Herwig Koppauer

Carolina Passenberg

Wolfgang Kemmetmueller

Thomas Specker

Derya Lindenmeier

Anne Von Vietinghoff

Arman Khosravani

A method for ascertaining an exhaust gas composition of an exhaust gas of an internal combustion engine with regard to an ammonia fraction and a nitrogen oxides fraction in an exhaust gas system including an SCR catalytic converter. The method includes detecting, using a sensor, a first signal whose magnitude is a function of the nitrogen oxides fraction of the exhaust gas upstream from the SCR catalytic converter, detecting using a sensor a second signal whose magnitude is a function of the ammonia fraction and the nitrogen oxides fraction of the exhaust gas downstream from the SCR catalytic converter, storing the two signals over an observation period, and ascertaining the ammonia fraction and optionally the nitrogen oxides fraction of the exhaust gas downstream from the at least one SCR catalytic converter using a calculation rule that uses the two signals during the observation period as input variables.

Method for ascertaining an exhaust gas composition of an exhaust gas of an internal combustion engine

The invention relates to a control circuit () for a waste heat recovery system () for a heat engine (). The waste heat recovery system () comprises at least one evaporator () for converting waste heat from the exhaust gas () generated by the heat engine () into a working medium (), at least one expansion machine () which can be driven by the working medium (), at least one condenser () for condensing the working medium () expanded in the expansion machine () into the liquid state (), and at least one conveying device () for increasing the pressure of the condensed working medium () and conveying same into the evaporator (). The control circuit () influences at least one control variable which controls the energy transmission from the exhaust gas () to the working medium () and/or the energy transmission from the working medium () to the expansion machine (). The control circuit () is designed to regulate the specific enthalpy hand/or the temperature Tof the working medium () entering the expansion machine () to a target value h, T, wherein the target value h, Tdepends on the pressure pof the working medium () entering the expansion machine (). The invention also relates to a waste heat recovery system () for an internal combustion engine of a vehicle () in the form of a heat engine () comprising the control circuit () and to a corresponding computer program.

Control circuit for waste heat recovery systems

A model calculation unit for calculating a data-based function model in a control unit is provided, the model calculation unit having a processor core which includes: a multiplication unit for carrying out a multiplication on the hardware side; an addition unit for carrying out an addition on the hardware side; an exponential function unit for calculating an exponential function on the hardware side; a memory in the form of a configuration register for storing hyperparameters and node data of the data-based function model to be calculated; and a logic circuit for controlling, on the hardware side, the calculation sequence in the multiplication unit, the addition unit, the exponential function unit and the memory in order to ascertain the data-based function model.

Model calculation unit, control unit and method for calibrating a data-based function model

A method for determining a modeling value of a physical variable in a gas guiding section of an engine system including an internal combustion engine, includes the following steps: operating the engine system in such a way that an air mass flow is present in the gas guiding section; determining instantaneous values of other physical variables; and determining the modeling value of the physical variable by solving a differential equation, which results as the discretization of a differential equation, with the aid of the previously ascertained instantaneous values of the other physical variables.

Method and device for ascertaining a modeling value for a physical variable in an engine system having an internal combustion engine

A method for determining at least one air system variable in an air supply system of an internal combustion engine in successive, discrete calculation steps, a differential equation being provided with respect to the air system variable based on measured and/or modeled variables, which describe conditions in the air supply system, a difference equation being formed for the quantization of the differential equation according to an implicit method, and the difference equation being solved in each discrete calculation step, in order to obtain the air system variable.

Method for real time capability simulation of an air system model of an internal combustion engine

Growing community of inventors

Gerlingen, Germany

Christian Fleck