Abstract: The invention relates to a method for controlling a pressure supply device in a hydraulic circuit, especially in a hydraulic circuit in an automatic gearbox which comprises an hydraulic pump, a pressure control valve and a consumer. The hydraulic pump is controlled if the system pressure falls below a specific lower threshold value and is switched off if a specific higher threshold value of the system pressure is reached or exceeded. In the data on the system pressure is not available, the current system pressure is calculated.

Abstract: In a method for determining evaluation data for transmissions in vehicles, data is measured in the vehicle via sensors, the measured data is used to form intermediate data specific to the vehicle and then, from the measured data and the intermediate data, evaluation data is determined which is shown, stored or transmitted to a data collecting station.

Abstract: The method for determining the mass of a vehicle comprises at least two measurements (6, 8) offset in time within a measuring period by which are determined respectively at least one traction variable (2) and at least one movement variable (4) of the vehicle, one of the two measurements (8) being effected during a traction-free phase and the other of the two measurements (6) during a traction phase. According to the invention, it is proposed that each of the two measurements comprises one data collection period (6, 8) the duration of which is longer than a minimum duration, that the traction variable corresponds to the timed integral of the traction and the movement variable to the change of speed of the vehicle.

Abstract: The invention relates to a method for determining a starting gear step for a vehicle with a stepped variable speed transmission with several gear steps. It is proposed that a maximum admissible value for a slip time (12) and/or a maximum admissible value for a frictional work (14) of the starting clutch during the starting process, the same as an available engine torque (10) for starting be determined, that beginning with a highest suitable gear step (18) for starting, values for the slip time (20) and/or the frictional work (22) be calculated in advance depending on the vehicle mass (8), that the precalculated values (20, 22) be compared with the maximum admissible values (12, 14), that the calculation loop be repeated with the next smaller suitable gear step for starting when at least one of the precalculated values is greater than the maximum admissible values and that a gear step be issued as starting gear step when the precalculated values are smaller than or equal to the maximum admissible values.

Abstract: The invention relates to a method for detecting cornering for a vehicle (2) with automatic transmission. According to the invention it is proposed that the current bend radius be determined from the rotational speed signals of the front wheels, that the beginning of a cornering mode be determined when the current bend radius falls below a first limit bend radius and the end of a cornering mode be determined when the vehicle has covered a presettable distance after exceeding a second limit bend radius.

Abstract: The invention relates to a method for determining a starting gear step for a vehicle with a multi-speed stepped variable transmission, wherein the starting gear step is determined by an electronic control device which is dependent on the vehicle mass; and a second variable which depends on the vehicle state is determined from the vehicle mass, the current traction and the current vehicle acceleration resulting therefrom.

Abstract: Optically active carboxylic acids ##STR1## where R.sup.1 is an organic radical which is linked to the asymmetric C' atom via a carbon atom and R.sup.2 is one of the radicals R.sup.1 (but not the same radical), halogen or an organic radical which is bonded to the asymmetric C' atom via an oxygen atom, are prepared by reacting a ketene II ##STR2## with an alcohol in a homogeneous liquid phase in the presence of a tertiary amine III and then converting the resulting ester into the acid, using an optically active alcohol IV.