Robert Boschgmbh

Mahle International Gmbh

Horst Wagner

Maik Schaufler

Ruediger Fehrmann

Michael Kessler

Jens Damitz

Peter Skala

Brahim Baqasse

Bjoern Bischoff

Dieter Poetsch

Dirk Hartmann

Steffen Mutschler

Dirk Samuelsen

Edwin Eberlein

Rolf Maier-Landgrebe

Peter Schubert

Juergen Biester

Andreas Huber

Joachim Palmer

Volker Massmann

Jens Graf

Wilhelm Blumendeller

Thomas Farr

Stefan Michael

Daniel Kuhn

Peter Schmuttermair

Boris Buchtala

Werner Becker

Ruprecht Anz

Thomas Bossmeyer

Thomas Glasstetter

Andreas Schieszl

Slobodanka Lux

Markus Schleyer

Volker Stuerzl

Steffen Rose

Heinz Hense

Bilge Manga

Martin Hoerner

Reudiger Fehrmann

Sabine Heinze

Matthias Miller

Christian Krause

Guenter Schöneck

Gerda Breitenbach, Legal Representative

Simon Wunderlin

Kai Liu

Erik Hass

A hydrostatic transmission for a traction drive includes a first hydraulic machine that is coupled to a drive machine and that has an adjustable displacement volume and a second hydraulic machine that is fluidically connected to the first hydraulic machine and that is coupled to a drive output of the traction drive. At the first hydraulic machine, a control pressure acts in the direction of an enlargement of its displacement volume and a working pressure of the second hydraulic machine acts in the opposite direction. The hydrostatic transmission further includes a control device that varies the control pressure to influence a torque of the second hydraulic machine. The control device stores a characteristic map by which a setpoint control pressure is determined as a function of a setpoint torque and a displacement volume of the second hydraulic machine so as to regulate the torque of the second hydraulic machine.

Hydrostatic transmission, traction drive having the transmission, and method for controlling the transmission

A method is used to control a hydrostatic drive including a drive machine, a hydraulic pump coupled to the drive machine, and a hydraulic motor coupled to the hydraulic pump via a hydraulic working circuit. In the method, at least one of multiple manipulated variables of the hydrostatic drive is ascertained and set, in the course of a precontrol, from a specified setpoint value for at least one of the controlled variables, including a pressure in the hydraulic working circuit, a speed of the hydraulic pump, and an output variable of the hydrostatic drive. In the method, the remaining controlled variables and/or manipulated variables are automatically updated.

Method for controlling a hydrostatic drive

A method for predefining an operating point of a drive machine of a drive system, including the drive machine and at least two loads which are driven by the drive machine is disclosed. The method includes the following steps: (i) identification of in each case one instantaneous load power demand of the at least two loads, (ii) determination of at least one partial request point of the drive machine for each identified load power demand in order to meet the respective load power demand, (iii) determination of at least one overall request point of the drive machine on the basis of the specific partial request points, (iv) determination of a cost variable of the drive machine for the at least one overall request point, and (v) selection of the operating point taking into account the cost variable and predefining of the operating point.

Method for predefining an operating point of a drive machine of a drive system

A method for diagnosing a sensor unit of an internal combustion engine, in which an output signal of the sensor unit is compared to a setpoint value which is specified independently from the output signal. The setpoint value relates to a periodic characteristic, and the variation over time of the value of the output signal of the sensor unit or a variable which is derived from the value variation over time is analyzed with regard to this periodic characteristic.

Method for diagnosing a sensor unit of an internal combustion engine

A method for monitoring a control loop or a regulating loop in a system, in particular in an engine system in a motor vehicle, is described. A characteristic value is ascertained from a preset value and a system variable of the regulating loop or the control loop during one or more state changes, and an error is detected as a function of the ascertained characteristic value.

Method and device for monitoring control and regulating loops in an engine system

A method and an emulation device for emulating control and/or regulating functions of a control or regulating unit, in particular of a motor vehicle. For emulation, the functions are swapped out into an external emulation computer, a data circuit is produced before the beginning of the emulation via a software interface of the emulation computer and a software interface of the control/regulating unit. In order to significantly accelerate the development and programming of new control/regulating functions of the control/regulating unit, the software interfaces are configured for the emulation of different control/regulating functions before the beginning of the emulation without changing the software.

Method and device for emulating control and/or regulating functions of a control or regulating device

In an internal combustion engine, at least one rotation variable characterizing the rotational movement of a crankshaft is ascertained cylinder-specifically. It is provided that, in an operating state in which differences and/or fluctuations of the rotation variable are basically a function of a combustion position, the instant of a fuel injection is adapted cylinder-specifically in order to reduce the differences and or fluctuations.

Method for operating an internal combustion engine

A method for operating a speed-controlled internal combustion engine, including regulating the rotational speed of the internal combustion engine, information concerning a torque to be set being provided as a manipulated variable, limiting the manipulated variable according to a torque limiting value in order to obtain a limited manipulated variable, activating the internal combustion engine as a function of the limited manipulated variable, and increasing the air volume fed to the internal combustion engine for achieving the torque to be set irrespective of the torque limiting value.

Method and device for air pilot control in speed-controlled internal combustion engines

In a method for operating an internal combustion engine, the exhaust gas energy of the internal combustion engine is increased when a variable that is characteristic of the compression of the compression device reaches a predefined value, the variable that is characteristic of the compression is the pressure ratio between the pressure downstream from the compressor and the pressure upstream from the turbine.

A method for regulating an actual output variable of an internal combustion engine to a reference variable. A maximum value for the reference variable is generated as a function of at least one physical variable in the exhaust system of the internal combustion engine and the reference variable is limited to this maximum value.

Method for regulating an actual variable of an internal combustion engine

A method and a device for operating an internal combustion engine, in particular a motor vehicle having a plurality of cylinder banks are described, making it possible to eliminate fluctuations in a time trend in an output quantity of the internal combustion engine that may result due to differences in operation of different cylinder banks of the internal combustion engine. A characteristic value of the output quantity of the internal combustion engine is determined repeatedly over time. The thus formed time trend in the characteristic value for the output quantity of the internal combustion engine is filtered as a function of the operation of the cylinder banks.

Method and device for operating an internal combustion engine

A method and a device for operating an internal combustion engine, particularly of a vehicle, having several cylinder banks are provided, which allow for a simplified control. For this purpose, a resulting requirement is formed by coordinating several output variable requirements of the internal combustion engine. The coordination of the requirements for several cylinder banks is performed jointly, and the resulting output variable requirement is then divided into several individual output variable requirements of each particular cylinder bank.

A device and a method for controlling an internal combustion engine are provided, in which a first actuating variable of at least one first actuating element is adapted on the basis of a comparison between a first cylinder-specific variable characterizing the combustion process in at least one cylinder and a setpoint value for this variable. On the basis of at least one second variable, at least one deviation value for at least one additional cylinder is determined. Based on this deviation value, a second actuating variable of a second actuating element is adapted.

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.

Method for controlling an internal combustion engine

A method and a device are described for filtering a variable. A first filtering arrangement is used for forming an output variable as a function of an input variable, the first filtering arrangement having at least a delaying effect. The input variable of the first filtering arrangement is corrected using a correcting variable which is obtained by starting from the input variable of the first filtering arrangement and by filtering, using a second filtering arrangement.

Method and device for filtering a signal

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Stuttgart, Germany

Horst Wagner