Abstract: A clocked power supply circuit is proposed which includes a control arrangement (20) which outputs switching signals (21) to switching means (13) as a function of a load condition present on the output side and which includes at least one inductive element (12). Provided on the output side is a load (22) which is independent of the electric consumer (18), preferably a gas discharge lamp, and is at least temporarily active. It is possible using the load (22) specifically to avoid no-load operation of the clocked power supply by means of a load, as a result of which the system-induced reaction time can be substantially shortened in the case of a short-term energy requirement of the consumer (18). The energy required in the short term can be supplied by the magnetic energy stored in the inductive element (12).

Abstract: A method is proposed for determining the rough engine run of an internal combustion engine (10), wherein a signal processing arrangement (13-19, 30, 50, 51) determines the engine rotation from a signal (Ub) appearing at a generator (11) driven by the internal combustion engine (10) or at a load (12) connected to the generator (11). The signal (Ub) is composed of signal components including long period durations (Tm) and signal components including short period durations (Tmn) which are evaluated separately as well as together in an evaluation unit (15). The signal component including the short period durations (Tmn) can be derived from commutation oscillations (40) which occur within signal Ub if the generator (11) is configured as an alternating current/three-phase current generator and is equipped with rectifiers and phase fan-in.

Abstract: The invention relates to an arrangement which permits operating characteristic variables such as the crankshaft rotational speed and the content of exhaust gas components to be determined in the workshop. The sensor is mounted so as to be stationary in the exhaust gas system or is only intermittently mounted in this system. According to one arrangement of the invention, the exhaust gas sensor includes a first device which receives the pressure of the exhaust gas of the engine. In this way, the crankshaft rotational speed can be arrived at. A second device is arranged in the exhaust gas sensor which has an output signal which is a measure for the content of an exhaust gas component. A further embodiment of the arrangement of the invention includes an exhaust gas sensor having a first device which is configured as a fault meter, temperature sensor or as a hot wire flow meter. Other devices can be utilized to detect further variables of the exhaust gas and evaluate the same.

Abstract: To permit physical separation and movement between an automotive vehicle and a test or diagnostic apparatus, the transducers transmitting signals representative of vehicle operating characteristics are coupled to a wireless transmitter, for example operating in long-wave, ultra-short-wave, infrared or ultrasonic mode; the signals are received in a wireless receiver constructed to receive the respectively transmitted signals, for application to a test or diagnostic apparatus. The system permits relative movement between the vehicle and the normally stationary diagnostic or test apparatus, for example to carry out diagnosis during movement of the vehicle.