Process for detecting a derailment of a rail vehicle

A process for detecting a derailment of a rail vehicle having two or more rail vehicle parts and one or more articulations through which adjacent rail vehicle parts are rotatably connected with one another, the process comprising:

• a) determining
• a-1) an angle of rotation between adjacent rail vehicle parts, and/or a quantity derived from the angle of rotation;
• or
• a-2) multiple angles of rotation or multiple quantities derived from the angles of rotation between different adjacent rail vehicle parts,
• b) comparing
• b-1) the angle of rotation or the derived quantity from a-1) or multiple angles of rotation or derived quantities from a-2) with at least one reference value or threshold, or with at least one reference value range or threshold range;
• and/or
• b-2) multiple angles of rotation or the multiple quantities from a-2) derived from the angles of rotation, relative to one another;
• and/or
• b-3) a state value that is determined from multiple angles of rotation or multiple quantities from a-2) derived from the angles of rotation with at least one reference value or threshold, or with at least one reference value range or threshold range,
• a test criterion indicating whether or not there is a derailment, this test criterion being defined based on:
• the at least one reference value or threshold, the reference value range, and/or the threshold range in b-1) or b-3), and/or
• an expected relationship of multiple angles of rotation, and/or an expected relationship of the multiple quantities from b-2) derived from the angles of rotation, relative to one another, and
• c) determining whether or not the test criterion is met and whether a derailment is happening or has happened, or is not happening or has not happened,
• wherein the threshold is an angle of rotation matching a minimum radius of a curve, and the test criterion is defined so that the angle of rotation is less than the threshold.