Continental Automotive Gmbh

Siemens Aktiengesellschaft

Thomas Schweiger

Matthias Kretschmann

Andreas Mayer

Jens Fiedler

Martin Stratesteffen

Celine Gamulescu

Ning Bian

In a method for determining a roadway state (STATE) of a roadway on which a vehicle () is travelling which has at least one wheel () and an acceleration sensor () which is assigned to the wheel (), in order to determine a vertical component of an acceleration of the wheel (), a characteristic value which is representative of the roadway state (STATE) is determined as a function of a measured signal (AC_VERT) of the acceleration sensor ().

Method for determining a roadway state

An inertial measurement unit (IMU) contains three linear acceleration sensors and three rotational speed sensors. For the sensors there are desired installation directions parallel to the co-ordinate axes of a Cartesian co-ordinate system which is fixed to the vehicle. The actual installation directions of the sensors may differ from the desired installation directions owing to incorrect orientations. By comparing accelerations which are measured by the linear acceleration sensors for different attitudes of the vehicle with acceleration values which are known for these different attitudes in the Cartesian co-ordinate system which is fixed to the vehicle, the actual installation directions of the linear acceleration sensors are determined. By using a co-ordinate transformation it is then possible to convert the measured accelerations into the actual accelerations.

Method for determining and correcting incorrect orientations and offsets of the sensors of an inertial measurement unit in a land vehicle

For determination of a relative movement of a chassis and a body of a wheeled vehicle, which is movably joined to the chassis, three linear accelerations of the wheeled vehicle, which extend perpendicular to each other, respectively, as well as at least two rotational speeds of one respective rotational movement or a component of a rotational movement about a coordinate axis of the wheeled vehicle are measured (in measuring device), the at least two coordinate axes running perpendicular to each other, respectively. A momentary position of the relative movement is determined (in evaluation unit) using the three linear accelerations and the at least two rotational rates.

Determining a relative movement of a chassis and a body of a wheeled vehicle

For monitoring of a measuring device (), located in a wheeled vehicle, the measuring device () is configured so as to measure three linear accelerations (in unit) of the wheeled vehicle, which extend perpendicular to each other, respectively, as well as three rotational speeds (in unit) and one respective rotational movement or a component of a rotational movement about an axis of the wheeled vehicle, the three axes running perpendicular to each other, respectively. At least components of an orientation of the wheeled vehicle in a vehicle-external coordinate system are determined (in unit) from the three rotational speeds, and at least one of the measured linear accelerations is monitored (in unit) using at least the components of the orientation and a comparative variable (from unit).

Method and arrangement for monitoring a measuring device located in a wheeled vehicle

For determination of dynamic axle and/or wheel loads of a wheel vehicle (), wherein for said wheel vehicle (), at least two linear transversally oriented with respect to each other accelerations and three rotation rates of a rotation movement around the coordinate axis of the vehicle () or of the component of the coordinate axis are respectively measured by a measuring device (). The three coordinate axes extend transversally with respect to each other and at least one axle load and/or wheel load of the wheel vehicle () are determined by means of at least two linear accelerations and three rotation rates with the aid of evaluation device ().

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Wörth, Germany

Thomas Schweiger