Abstract: In a circuit configuration for monitoring a plurality of coils and the final stages for actuating these coils, the coils are connected to the supply voltage by way of a joint supply line and a joint relay. Connected to the supply line, by way of a high-ohmic resistor, is a test voltage source and a first potential monitor, by which the potential prevailing on the supply line is determined after the voltage supply has been interrupted by opening the relay contact. A second potential monitor serves to monitor the proper potential changes on activation of the voltage supply by actuating the relay.

Abstract: An electrohydraulic pressure control device consisting of one or several electromagnetically operable hydraulic valves arranged in a block-shaped manner on a valve accommodating body. In order to provide both a compact and operationally optimized pressure control device which makes manufacture, checking and assembly as easy as possible and where different thermal expansions of the components are to be received possibly without any tensions, this invention provides that the coils (1), flexibly held frictionally and/or positively by an elastic or plastic holding device (4) arranged on the carrier element (2) of the cover (3), are flexibly alignable with respect to the valve accommodating body (5).

Abstract: A circuit configuration which serves to condition the output signal of a rotational speed sensor, e.g., the wheel sensor of an automotive vehicle. The circuit configuration includes a trigger circuit, the "hysteresis" or trigger thresholds thereof being controllable, and includes circuits for determining a coupling factor which, multiplied by the frequency of the sensor signal corresponding to the speed of rotation, forms the amplitude of the sensor output signal. To determine the coupling factor, and to adjust the hysteresis, threshold values are predefined for the output signal of the rotational speed sensor. Upon start of the vehicle, the coupling factor is determined from the frequency of the sensor signal at the point of time the threshold values are reached, and the hysteresis is adjusted accordingly.

Abstract: An electrohydraulic pressure control device consisting of one or several electromagnetically operable hydraulic valves arranged in a block-shaped manner on a valve accommodating body. In order to provide both a compact and operationally optimized pressure control device which makes manufacture, checking and assembly as easy as possible and where different thermal expansions of the components are to be received possibly without any tensions, this invention provides that the coils (1), flexibly held frictionally and/or positively by an elastic or plastic holding device (4) arranged on the carrier element (2) of the cover (3), are flexibly alignable with respect to the valve accommodating body (5).

Abstract: A circuit configuration for limiting the cutoff voltage occurring in controlling a servomotor (M) by means of width-modulated DC pulses comprises a power transistor (T2) which, via a capacitor (C) is connected through for a short time when a cutoff voltage appears thus limiting the cutoff voltage. Subsequently the transistor (T2) presents a high impedance. As a result a short-circuiting of the servomotor (M) will be prevented in the phase in which a spring force resets the servomotor into its zero position.

Abstract: A housing for installation in motor vehicles to accommodate SMD electronic components disposed on one side of a multi-layer circuit board or film. A metal plate serves as the carrier for the circuit board or film, with the planar expanse of the metal plate being the same as or greater than that of the board or film, with the board or film being disposed on, attached to and electrically insulated from the metal plate. When the area of the metal plate is greater than that of the board or film, power components are disposed on the surface of the metal plate in a region not covered by the board or film, whereas when the area of the metal plate is substantially the same as that of the board or film, power components are disposed on the board or film, with the metal plate serving as a heat sink for the power components.

Abstract: A circuit configuration for actuating a safety relay (1) such as the main relay of an electronically controlled brake system of an automotive vehicle at least has two transistors (T1, T2) connected in series and a monitoring circuit (5) which will urge the transistors into the non-conductive state if there is a defect or trouble. The operativeness of the transistors (T1, T2) or of the monitoring circuit (5) will cause the safety relay (1) to be switched off.

Abstract: A circuit configuration for editing, or processing the output signal of a speed sensor (5) includes a trigger circuit (1, 22), the changeover points or "hysteresis" of which are controllable, with the circuit configuration being furnished with circuits for determining the coupling factor (k), and with circuits for adjusting the hysteresis in response to the coupling factor. The coupling factor (k)--multiplied by the frequency of the sensor signal corresponding to the speed--forms the amplitude of the sensor output signal. With the coupling factor (k) being high, the hysteresis will be high, while it will be low with a low coupling factor.

Abstract: This is a circuit configuration provided for an anti-lock-controlled brake system and serving for processing sensor signals obtained by wheel sensors (5) and for generating braking pressure control signals. This circuit configuration contains two microcontrollers (1, 2) interconnected by data exchange lines (7). The handled signals are concurrently processed by the microcontrollers independently of one another and the exchanged signals are checked for consistency. A deviation of the exchanged signals which is due to malfunctions is signalized to a safety circuit (8) which, thereupon, interrupts the power supply to the solenoid valves (Ll . . . Ln). The monitoring signal (WD1, WD2) fed to the safety circuit (8) is a predetermined alternating signal in case of consistency of the exchanged signals and in case of proper operation of the circuit configuration.

Abstract: A circuit configuration for monitoring the final stages of a plurality of valves, particularly the power transistors (LT1-LT4) and their circuitry, for defects as well as for leakage currents or by-path currents comprises a comparator circuit (1), an OR-link (2) and of a further comparator element (XOR4). By way of the monitoring circuit, the actuation connections (S1-S4) of electromagnetically operable valves are connected to a sole output (A3). By applying short test pulses to the actuation inputs (E1-E4) of the final stages (LT1-LT4) and by comparing the signal variation at the output (A3) with the test pulse variation defects, leakage currents and the like are detected.

Abstract: To process the output signal of a rotational speed sensor (2) which generates an alternating voltage dependent in respect of frequency and amplitude on the rotational speed, two low-pass filters (TP1, TP2) serve to produce a useful signal (I1), on the one hand, and a reference signal (I2), on the other hand. The two signals are compared. In dependence on the difference of these signals (I1, I2) a pulse-shaped output signal, namely the processed sensor signal, is generated by means of a comparator (7). The reference signal dynamically follows the useful signal with the aid of a control signal issue by an adapter circuit (20,21).

Abstract: To avoid dangerous pressure decreases in antiskid systems, it is necessary to continuously monitor the operability of the electrical components. The present invention ensures maximum reliablity and a simple circuit configuration. Electrical signals are generated during the period of time in which a pressure decrease occurs and/or by the speed of pressure decrease at each wheel of a vehicle axis and are subtracted from one another. If the absolute value of the difference reaches a limiting value, the disturbed part of the system will be prevented from causing a further pressure decrease.

Abstract: To control a brake slip control apparatus, the rotational behavior of the wheels or of the axles is sensed with the aid of sensors, and the sensor signals for the generation of valve control signals, by which the braking pressure at the wheels is controlled dependent upon the wheel rotational behavior, will be processed electronically. On the basis of these sensor signals, valve control signals will be produced in at least two independently acting, synchronously driven logical circuit units, which may be integrated circuit configurations or complete "microcontrollers" or single-chip-microcomputers, and the signals' waveforms of each of the two circuit units can be compared and checked for agreement externally and internally at corresponding locations within the two circuit units. Upon the occurrence of variations in the external and/or the internal signals or in the signals' waveform, there will be caused, initiated or prepared a complete or partial disconnection of the brake slip control.

Abstract: It is known that an output valve providing a pressure decrease in a wheel brake cylinder can be controlled by a pulse train which is variable in response to the acceleration or deceleration of the associated wheel. A disadvantage of such an arrangement is that a wheel at standstill will not be able--under certain circumstances--to accelerate again during a control cycle. Additionally, the wheel brake cylinder pressure may have been decreased to such an extent that the wheel will neither continue to decelerate, or accelerate sufficiently. According to the present invention the control behavior is improved in these critical cases by generating pulses proportional to wheel acceleration and to transmit an opening signal to the outlet valve upon cessation of the accelerating pulses. The opening signal is immediately switched off as soon as the acceleration pulses occur again.

Abstract: Converters are known where input pulses are coupled to a detector stage via an adding device and a first integrating register. The detector stage provides an output signal relative to threshold values which increases, keep constant or reduce the contents of a second integrating register. The contents of the second register are coupled to the minus input of the adding device. The time variation of the input pulses may be coupled from the detector stage. According to the present invention the dynamic behavior, stability and suppression of disturbances is improved by differentiating the input pulse train, coupling this pulse train to the detector stage and to integrate the output of the detector stage with the integration factor being constantly adjusted to the output signal of the detector stage.

Abstract: It is known that a vehicle speed reference signal suitable for slip control can be obtained by fully releasing the braking force at one or more vehicle wheels intermittently and to obtain the true vehicle speed from the signal provided by the free-rotating wheels. However, this technique results in the stopping distance of the vehicle being longer than desired since the braking effectiveness is considerably reduced. To avoid this disadvantage, the present invention compares a speed reference signal cyclically with the instantaneous velocity signals of the wheels and to weight the comparison result dependent on whether the instantaneous velocity signal comes from a driven wheel or a non-driven wheel. The weighted comparison result provides a correcting factor for the speed reference signal.

Abstract: An encoding transmitting unit converts parallel data words into timing pulse synchronized serial data words which are supplied to a transmission channel, and a decoding receiving unit receives the transmitted serial data words from the transmission channel. The encoding unit comprises a clock-pulse generator and a control circuit connected to a shift register receiving the parallel data words and having a feedback, through an inverter, from a serial word output to an additional input which is a serial word input for the inverted output signal. The shift register transmits a first pulse train representing the serial data word followed by a second pulse train representing the inverted serial data word. The decoding receiving unit includes a second shift register having a serial data word input receiving the two pulse trains from the transmission channel and having a serial data word output.