Abstract: A device is for the optoelectronic measurement of torque with a first component (2), and a second component (3), it being possible for the first component (2) to be connected to a drive element and the second component (3) to be connected to a drive element, or vice versa. A first encoding element that is arranged on the first component (2). A second encoding element is arranged on the second component (3). A first light barrier (6) detects the rotational movement of the first encoding element. A second light barrier (7) detects the rotational movement of the second encoding element. An electronic evaluation unit (8) detects and evaluates signals originating from the first light barrier (6) and second light barrier (7), with at least one elastic element that is deformable according to a torque acting upon it being provided between the first (2) and the second component (3).

Abstract: In a method for monitoring the functioning of a compressor, which charges a gas-filled accumulator chamber with a working pressure, the actual pressure prevailing in the accumulator chamber is measured and compared to a setpoint pressure. In response to a deviation in the actual pressure from the setpoint pressure, an error signal is produced. The comparison of the actual pressure and the setpoint pressure is carried out during the charging operation when the accumulator chamber is charged.

Abstract: It is proposed that a pneumatic suspension leveling system for vehicles with pneumatic suspension leveling elements assigned to the vehicle axles and/or vehicle wheels, with a compressor and a central pressure accumulator fed by it for the compressed air supply of the pneumatic suspension leveling elements, with an accumulator pressure sensor which detects the air pressure in the central pressure accumulator and generates a signal value correlating thereto, and with an electronic control device which processes the signal values of the central pressure accumulator and induces a pressure charging of the central pressure accumulator by the compressor, when the signal value of the accumulator pressure sensor reaches a predetermined lower threshold signal value and terminates this pressure charging when the signal value of the accumulator pressure sensor reaches a preset upper threshold signal value be improved with respect to its functional capacity.

Abstract: It is proposed that a pneumatic suspension leveling system for vehicles with a compressor which can be turned on and off by a control device in function of demand, which compressor only needs to operate intermittently, with predetermined on-time duration, during normal operation, be improved with respect to its functional capacity. This problem is solved in accordance with the invention in that the control device of the pneumatic suspension leveling system varies the on-time duration of the compressor in function of the heat transfer conditions which prevail between the compressor and the air enveloping the latter.