Abstract: The invention provides a motor vehicle anti-theft system in which an authorization code, representing the access authorization, is transmitted via the vehicle starting line arranged downstream from the ignition switch, to a start release unit. A control unit for the engine start, previously in an engine-start-blocking condition, is thereby placed into a release condition, in which it transmits a start request (arriving from the starting line) to the starter motor. By using the starting line for transmitting the authorization code, it is achieved that the latter is coupled through a connection which is necessary for the start, and therefore cannot fail separately.

Abstract: An arrangement for limiting the terminal voltage in an alternator has a fixed stator winding acting on rectifiers and an excitation winding which rotates with the alternator rotor. The arrangement also has a controller and a first slip ring contact which load the excitation winding with excitation current as a function of the magnitude of a delivered voltage, and at least one free-wheeling valve which is conductive during a controller-side interruption of the excitation current and is connected in parallel with the excitation winding. The arrangement includes an auxiliary winding on the rotor. The auxiliary winding continues the excitation winding in the same direction of winding, with the auxiliary winding and the excitation winding being connected at a first connection point. A second slip ring contact operatively connects the first connection point to a machine terminal supplying excitation current.

Abstract: A safety arrangement for an adjusting installation of a seat adapted to be actuated manually or programmed, especially of a vehicle seat, with adjusting motors and with an electronic circuit which gives priority to the manual seat adjustment over a programmed seat adjustment, which, in case of a relay or adjusting motor defect, opens up the corresponding circuit, which in case of a simultaneous actuation of several position buttons, interrupts a programmed seat adjustment and which after interruption of the energy supply permits a programmed seat adjustment only after renewed storage of a seat position.

Abstract: A device for detecting undesirable combustion processes in internal combustion engines having spark-ignition systems, an acceleration sensor and a band-pass filter tuned to a frequency of a knocking vibration, with an output value of the filter being compared with a reference value, whereby results of the comparison are compared with undesirable combustion processes to be detected. Body noise signals received by the acceleration sensor pass through a band-pass filter. A series circuit composed of a band-blocking filter tuned to the frequency of the knocking vibration, including an r.m.s. rectifier and an amplifier, is provided through which the body noise signal received by the acceleration sensor is converted into a reference signal. A comparator is provided when the reference signal and the knocking signal are compared with one another, whereby an output signal appears when the knocking signal exceeds the reference signal.

Abstract: An apparatus for detecting undesirable combustion characteristics in spark-ignited internal combustion engines. A sensor and band-pass filter tuned to the frequency of the knock vibration are provided with an output of the band-pass filter being compared with a reference value. The result of the comparison is correlated with undesirable combustion characteristics to be recognized. A rectifier is provided for solid borne sound signals received by the sensor with the signals passing through the band-pass filter. The signal is rectified in the rectifier to a knock signal and a series circuit composed of a band-stop filter tuned to the frequency of the knock vibration, an r.m.s. rectifier, and an amplifier is provided by means of which the sound signal received by the sensor is converted into a reference signal. A comparator is provided when the reference signal and the knock signals are compared and an output signal is generated if the knock signal exceeds the reference signal.

Abstract: An apparatus for detecting undesirable combustion characteristics in spark-ignited internal combustion engines. A sensor and a band-pass filter tuned to the frequency of the knock vibration are provided with an output of the band-pass filter being compared with a reference value. The result of the comparison is correlated with undesirable combustion characteristics to be recognized. A rectifier is provided for solid-borne sound signals received by the sensor with the signals passing through the band-pass filter. The signal is rectified in the rectifier to a knock signal and a series circuit made up of a band-stop filter tuned to the frequency of the knock vibration, an rms rectifier, and an amplifier is provided by means of which the sound signal received by the sensor is converted into a reference signal. A comparator is provided when the reference signal and the knock signal are compared with each other and an output signal appears if the knock signal exceeds the reference signal.