Daimler Chrysler Ag

Dr. Ing. H.c. F. Porsche Aktiengesellschaft

Robert Boschgmbh

Tobias Roulet

Dieter Kalweit

Sven Merkle

Martin Streib

Nils Sauvlet

Thomas Frey

Martin Person

Florian Fuhr

Holger Bartels

Markus Gantikow

Stefan Wimmer

Heiko Mayer

Martin Debusmann

Thomas Mossner

Dominik Bender

Christoph Bittner

Christian Wiedenbruegge

Hong Truc Jung

Leonie Christin Freisinger

Andrej Panten

A method for estimating cardan shaft moments in a vehicle includes performing a state space modelling of a physical model for force transmission in at least one drive train The at least one drive train is formed with at least one drive machine, at least one axle and at least two axle shafts each with a respective wheel. The method further includes selecting the physical model as a torsional oscillator chain in which a respective drive machine inertia moment is assigned to the respective drive train and a respective wheel inertia moment is assigned to the respective wheel. The respective drive machine inertia moment is connected by a respective spring-damper element to the respective wheel inertia moment of the respective wheel which is connected to the respective axle shaft. A vehicle mass is connected by a respective spring-damper element to the respective wheel inertia moment of the respective wheel.

Method and drive system for estimating cardan shaft moments in drive trains

A drive system includes at least two drive devices, at least one of which is electric, that drive at least two drive axles, a power electronics system, an energy storage arrangement, and a control device. The control device includes a drive control module for providing a recuperation limiting value for each electric drive, a recuperation control module for combining the recuperation limiting values to form a maximum recuperation total limiting value, and a brake control module for providing a total braking torque requested by a driver or assistance system, such that it derives a recuperation total torque that is less than the recuperation total limiting value and also derives recuperation partial torques for each electric drive. In the case of a total braking torque that is greater than the recuperation total limiting value, the brake control module generates a hydraulic brake pressure and transmits it to the brake system.

Drive system for a motor vehicle and method for operating such a drive system

In a method for determining the torque of the crankshaft of an internal combustion engine, the intake work of the cylinder in the respective working cycle during the intake period, the compression work of the cylinder in the respective working cycle during the compression period, the combustion work of the cylinder in the respective working cycle during the combustion period and the expulsion work of the cylinder in the respective working cycle during the exhaust period are determined, and the work on the crankshaft in the respective working cycle is determined therefrom.

Method for determining the torque on the crankshaft of an internal combustion engine

In a method for controlling an internal combustion engine by means of interventions in at least one manipulated variable of the internal combustion engine, a setpoint torque or work which is to be performed is determined at the crankshaft of the internal combustion engine, wherein, with respect to a first variable as work which is to be performed or a setpoint torque to be provided, a corresponding setpoint quantity of heat is determined taking into account the instantaneous actual efficiency, with respect to which at least one associated manipulated variable is set in accordance with the value of the set-point quantity of heat, and, for precise setting of the torque, the actual quantity of heat also being sensed, a setpoint efficiency being determined from the actual quantity of heat taking into account work which is to be performed or a setpoint torque which is to be provided, this can correspond to the first variable or to another variable which is formed as a setpoint torque or work which is to be performed at the crankshaft, and at least one manipulated variable of the internal combustion engine is set approximately simultaneously in accordance with a setting of the setpoint efficiency.

Method for controlling an internal combustion engine

In a method for setting an intake manifold pressure or a mass volumetric efficiency of an internal combustion engine, a change in the setting of the engine throttle valve when needed during operation of the engine is increased beyond the desired setting by such an amount and for such a period of time that the change in the setting of the throttle valve corresponds at least approximately to the air mass flow rate which is required in order to set the internal combustion engine to the new load state.

Method of controlling an internal combustion engine

The invention proposes a method for torque monitoring in the case of Otto engines in motor vehicles, in which a reference torque value (M,) is derived from the speed (n) of the Otto engine and the air mass (L) supplied and, in homogeneous lean operation (lambda&equals;1 to 1.4), this reference torque value (M,) is corrected by a signal derived from a signal (&lgr;,) from a lambda probe and is then compared with a torque value (M,) specified by the driver. Torque-reducing interventions in the control of the engine are performed if the corrected reference torque value (M,) exceeds the torque value (M,) specified by the driver by a specifiable factor or value. This method allows reliable and accurate torque monitoring, even at lambda values greater than 1.

Method for torque monitoring in the case of Otto engines in motor vehicles

In a process for automatically controlling the speed of a motor vehicle, the vehicle speed is controlled to a definable desired speed (v,). When a speed change is initiated by the driver, the control event is canceled and, after the conclusion of the speed change, a new desired speed (v,) is detected as a controlled variable. The amount of the actual acceleration (&verbar;a,&verbar;) is then compared with the amount of a definable reference acceleration (&verbar;a,&verbar;<&verbar;a,&verbar;). The momentary speed at the point in time when the amount of the actual acceleration (&verbar;a,&verbar;) is less than or equal to the amount of the definable reference acceleration (&verbar;a,&verbar;) is stored as the new desired speed (v,), which can be corrected as a function of operating parameters.

Process for automatically controlling the speed of a motor vehicle

A method and an arrangement for controlling or limiting the speed of a vehicle includes a controller which limits or controls the speed of the vehicle to a pregiven value. There is a movement out of or into the control region by actuating or releasing the accelerator pedal. When reentering into the control region, the controller starts with a start value which takes into account the speed trace in the phase after leaving the control region.

Method and arrangement for controlling and limiting the speed of a

The invention is directed to a method and an arrangement for controlling the drive power of a motor vehicle equipped with a chargeable spark-ignition engine. In this method and arrangement, the engine power is adjusted via the air input and the charging pressure independently of each other as a function of the accelerator pedal deflection. In one range of the accelerator pedal deflection, the engine power is adjusted by adjusting an engine power actuator in dependence upon the accelerator pedal deflection and/or, in another range, the charging pressure is adjusted in dependence upon the accelerator pedal deflection.

Growing community of inventors

Leonberg, Germany

Tobias Roulet