Abstract: In a device for determining the weight of a motor vehicle which is being moved by propulsive forces in its longitudinal direction, signals which correlate with a propulsive force and with a corresponding vehicle longitudinal acceleration are recorded with the aid of a sensing system during successive time intervals. Signals recorded at at least two points in time are used by a computer to produce a signal which correlates to the vehicle's weight. To enhance the device's accuracy, signals for the propulsive force and for the corresponding vehicle longitudinal acceleration are detected at successive points in time which follow one another at constant time intervals. The signals in a memory are stored, where they form a time sequence for the propulsive forces and the corresponding vehicle longitudinal accelerations. A plurality of successive stored signals of the time sequence are read from the memory and used to generate the signals that correlate to the current weight of the vehicle.

Abstract: Device for determining the mass of a motor vehicle by determining the running resistance of the vehicle with the clutch in the drive train disengaged, and by repeatedly determining the torque of the engine and, at the same time, repeatedly measuring the vehicle acceleration with the clutch engaged and by taking into account the ratio of the transmission, an average value of the vehicle mass can be determined with a high degree of accuracy.

Abstract: An improvement comprising a device for determining a recommended gear-shifting of a transmission of a motor vehicle, especially a commercial motor vehicle, which is powered by an internal combustion engine and which is provided with a transmission having gradient speeds. In operation, measured values are provided for determining current operating points, with the measured values being compared with values of an optimum range of the engine performance characteristic with regard to fuel consumption. Measuring sensors are fitted for sensing at least one of the engine speed, the engine torque, and the speed of the vehicle.