Abstract: A motor vehicle includes a crash detection device for detecting an imminent collision between the vehicle and an obstacle and a vehicle lifting device that cooperates with the crash detection device to suddenly compensate for a brake diving movement of the vehicle before the vehicle collides with the obstacle.

Abstract: A motor vehicle includes a crash detection device for detecting an imminent collision between the vehicle and an obstacle and a vehicle lifting device that cooperates with the crash detection device to suddenly compensate for a brake diving movement of the vehicle before the vehicle collides with the obstacle.

Abstract: The invention relates to a flat-track unit for motor vehicle test beds comprising a roadway-simulating belt guided over two rollers. So that skew angles between belt running direction and wheel plane can be realized as close to reality as possible on the test bed, the frame supporting the guide rollers of the belt is pivotably mounted about a vertical axis and is provided with a pivot drive variable in a high-frequency manner. The drive and braking unit for the rollers is arranged so as to be spaced from the flat-track unit and mounted in a fixed position in the vertical direction, while it is displaceable on a circular arc-shaped horizontal guide running concentrically to the vertical axis. A corresponding displacement drive is provided for the drive and brake unit. The latter causes the drive and braking unit to follow, at a comparatively slow speed, the belt running directions of the flat-track unit and on which belt torsional oscillations are superimposed.

Abstract: The invention relates to a flat-track unit for motor-vehicle test beds in which a roadway-simulating belt is guided over two rollers lying in parallel. The upper test side of the belt lies roughly at ground level and accommodates a vehicle wheel and can be excited by a supporting shoe below the belt via an excitation cylinder to develop vertical oscillations which are to simulate roadway vibrations. The two belt-guiding rollers are in turn mounted in a frame which in turn is guided so as to be vertically movable and can be excited by a further excitation cylinder to develop vertical oscillations. In the process, the supporting shoe oscillations are limited to short-stroke and high-frequency oscillation portions of simulated driving conditions whereas the frame is excited merely by the long-stroke and low-frequency oscillation portions.