Abstract: A vibronic measuring device, e.g. limit level sensor, for determining and/or monitoring at least one process variable, includes a mechanically oscillatory unit, which is excited to vibrate by at least one drive unit based on an electrical signal SA. A receiving unit receives and converts mechanical vibrations into an electrical signal SE. A control and evaluation unit applies closed- and/or open-loop control of the vibrational excitation, and evaluates the signal SE with respect to the process variable. A vibration sensor pick up a sensor signal SS at the vibration sensor, and an analysis unit is supplied with signals SE and SS, and applies self-learning analysis of the input signals and transmits reliability information for the signal SE to the control and evaluation unit.

Abstract: In a method for operating a motor vehicle, in particular a car, comprising an internal combustion engine, a vehicle battery and an occupant cell, the internal combustion engine being operated with a start/stop function wherein the internal combustion engine is switched on and off automatically during the operation of the vehicle in dependence on parameters such as a current drive power demand, and temperature, the start/stop function is activated only if the vehicle battery has a battery temperature which is above a minimum temperature value and the battery is exposed to the heated or cooled air conducted through the occupant cell of the vehicle.