Robert Boschgmbh

Bosch Corporation

Nils Hagenlocher

Andreas Offenhaeuser

Martin Kieren

Erik Lesser

Tobias Oberhardt

Thomas Brettschneider

Andreas Erban

Charlotte Grinenval

Toshihide Iiba

Raphael Wenzel

Tobias Hofmann

A method for determining a friction coefficient potential of a road surface. A total torque for operating a vehicle is unequally distributed among at least two wheel torques at wheels of the vehicle. The friction coefficient potential is ascertained using a detected slip between the road surface and at least one of the wheels and the wheel torque present at the wheel.

Method and control unit for determining a friction coefficient potential of a road surface

In a method for ascertaining the coefficient of friction between a vehicle wheel and the roadway, at least one active vehicle unit influencing the longitudinal dynamics of the vehicle is controlled during the trip in such a manner, that the longitudinal wheel force acting upon at least one vehicle wheel is increased, and/or the contact patch force of the wheel is decreased, while the characteristic of the sum of all of the longitudinal forces acting upon the vehicle remains unchanged.

Method for ascertaining the coefficient of friction between a vehicle wheel and the roadway

A method for determining a state of a roadway of a vehicle. A first distance value of a measurement coordinate to a first tire characteristic curve associated with a first state of the roadway is ascertained. A second distance value of the measurement coordinate to a second tire characteristic curve associated with a second state of the roadway is ascertained. The measurement coordinate represents a measurement carried out using at least one vehicle sensor of a presently utilized traction between wheels of the vehicle and the roadway and a wheel slip of the wheels, while the first tire characteristic curve and the second tire characteristic curve are based on a model function for the modeled representation of the traction as a function of the wheel slip. An output signal representing the state of the roadway is output using the first distance value and the second distance value.

Method and device for determining a state of a roadway of a vehicle

A method and device for determining a coefficient of friction of a passable supporting surface with the aid of an ego vehicle, including a step of acquiring first data values, which represent a moisture level in the surrounding area of the ego vehicle, a step of checking the plausibility of the acquired, first data values by comparison with at least one second data value, and a step of determining third data values, which represent the coefficient of friction of the passable supporting surface; the determination taking place as a function of the plausibility check of the first data values, using the at least one second data value.

Method and device for determining a coefficient of friction of a passable supporting surface with the aid of an ego vehicle

A method for operating a driver assistance system for motor vehicles, which each include multiple wheels in contact with a roadway, at least one of the motor vehicles ascertaining at least one instantaneous friction coefficient between at least one of the wheels and the roadway with the aid of at least one friction coefficient model, and at least one driver assistance unit of the respective motor vehicle being set or calibrated as a function of the ascertained friction coefficient. It is provided that the ascertained friction coefficient is transmitted to a central database, and that the database provides the ascertained friction coefficient to the other motor vehicles.

Method and device for operating a driver assistance system, and driver assistance system

A method for operating a driver assistance system of a motor vehicle, which includes multiple wheels in contact with a roadway, the driver assistance system including at least one unit which includes a friction coefficient model and at least one sensor, which provides an input signal for the friction coefficient model, a friction coefficient between at least one of the wheels and the roadway being ascertained with the aid of the friction coefficient model, and the driver assistance system being set or calibrated as a function of the ascertained friction coefficient. Friction coefficients are ascertained with the aid of multiple of the units that ascertained friction coefficients are compared to one another, at least one valid friction coefficient of the friction coefficients is determined with the aid of the comparison, and the driver assistance system is set or calibrated as a function of the valid friction coefficient.

In a method for automatic movement controlling of a vehicle, at least one trajectory is determined on the basis of environmental and driving state data, and driving state quantities are subsequently calculated for an upcoming time period, using a mathematical vehicle model, taking the trajectory as a basis.

Method for automatic movement controlling of a vehicle

A method for operating a motor vehicle that has at least one driving engine which is operatively connected to at least one drive wheel and is controlled as a function of an accelerator-pedal position in order to generate a drive torque, an engine drag-torque control being carried out to avoid skidding of the drive wheel when the accelerator pedal is moved in the direction of a neutral position. It is provided that a maximum permissible engine drag torque is specified to the engine drag-torque control as a function of a currently effective coefficient of friction of the road surface which is determined as a function of a present position of the motor vehicle.

Method and device for operating a motor vehicle

A method for ascertaining a minimum value for the friction coefficient of a road segment, in which at least one movement variable of a second vehicle, which characterizes the vehicle movement, is ascertained with the aid of a surroundings sensor system contained in a first vehicle; a minimum value for the friction coefficient of the road segment traveled by the second vehicle is ascertained on the basis of the at least one movement variable of the second vehicle; the spatial position of the first vehicle is ascertained; the relative position of the second vehicle with respect to the first vehicle is ascertained with the aid of the surroundings sensor system; the spatial position of the second vehicle is ascertained with the aid of the spatial position and the relative position of the first vehicle; the spatial position of the second vehicle and the minimum value are stored in a database.

Method and device for ascertaining a minimum value for the friction coefficient of a road segment

An ECU which includes a receiving portion that receives a control signal related to braking of a vehicle transmitted from an external ECU installed outside the ECU and a yaw rate estimation portion that estimates a yaw rate of the vehicle, based on a vehicle speed and steering angles which indicate turning angles of a steering wheel of the vehicle or turning angles of a wheel.

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Stuttgart, Germany

Nils Hagenlocher