Abstract: A sensor arrangement and engine management device for a combustion engine, the engine management device including the sensor arrangement for detecting variables indicative of engine load, a mechanism for determining engine load on the basis of measured values supplied by the sensor, as well as a throttle-valve position control loop. At least two of the sensors of the sensor arrangement, which may include a mass air-flow sensor, an intake-air temperature sensor, an induction-pipe pressure sensor, and a throttle-valve position sensor, are microintegrated in a modular unit. The engine management device is made such that a sensor device with the at least two sensors, the mechanism for determining, engine load and/or the throttle-valve position controller used in the throttle-valve position control loop are microintegrated in a modular unit. The engine management device can be used, for example, for controlling a spark ignition engine in a motor vehicle.

Abstract: A method for controlling an internal combustion engine with the aid of an engine control unit, having actuators for the electromagnetic valve control, as well as additional actuators, wherein each cylinder head has a separate actuator control unit, which is connected via a data bus to the engine control unit.

Abstract: The invention relates to an apparatus for operating actuators for electromagnetic valve control in internal-combustion engines.

Abstract: A circuit arrangement for independently switching the induction coils of several d.c.-operated solenoid valves connected in parallel that, with a reduction of power loss, features a disconnection time which is independent of the voltage of the d.c. voltage source.

Abstract: A circuit configuration for the evaluation of inductive sensor signals in motor vehicles is described. An input stage comprising an input circuit and a reference circuit and a threshold value stage comprising a peak value rectifier circuit, converter circuit, comparator circuit, and adjustment circuit are provided for the recognition of the crossover of an alternating voltage sensor signal.

Abstract: A tire pressure sensor to be fastened to a rim of a vehicle wheel for sensing an inflation pressure of a tire mounted on the rim, the tire pressure sensor comprising a reference pressure chamber having a gas filled reference pressure volume, an electrically conductive diaphragm for sealingly separating the reference pressure chamber at a tire interior, a sensor electric circuit, a contact pin located in the reference pressure chamber and cooperating with the electrically inductive diaphragm for closing the sensor electric circuit when the tire inflation pressure is at a predetermined value, and an additional pressure chamber communicating with the reference pressure chamber and deformable to change the reference pressure volume therein to thereby establish a predetermined reference pressure in the reference pressure chamber.

Abstract: A device for the transmission of measuring signals for the tire pressure of twin wheels of motor vehicles comprises for the purpose of enabling a simple exchange of the individual wheels in the twin wheel at least two signal transmitters which are arranged at each individual wheel in the area of the free outer rim edge in such a way that the first signal transmitter of the first wheel is electrically connected with a sensor of the first wheel and with the signal transmitter of the second wheel, and the signal transmitter of the first wheel is electrically connected with a sensor of the second wheel and with the second signal transmitter of the second wheel by means of coupling devices which are arranged on the rims. A stationary signal receiver is provided in the area of the free outer rim edge of the respective inner individual wheel at a distance from it.

Abstract: In a process for establishing the driving direction of a vehicle by an electronic compass fixedly mounted in the vehicle and which is provided with a magnetometer having a computerized evaluation circuit the local curve (O) of the earth field (He) is determined from five measuring points (M1 . . . M5) which are established by turning the vehicle and corresponding signals are stored. The parameters for the center point displacement (Hs), the shape (ellipse) and the turning (angle .alpha.) of the local curve (O) in the vector diagram (x,y) are calculated by the computer by means of an algorithm with five unknowns for the five measuring points and thereafter the direction of the earth field (He) is computed. Subsequently, the vehicle is oriented to a predetermined cardinal direction and a correction angle is determined from the difference of angles between the cardinal and north directions and the earth's magnetic field direction measured by the compass.

Abstract: A process for correcting inclination dependent angle errors when establishing the driving direction of vehicles with an electronic compass for navigation is suggested. The compass comprises a magnetometer (10) with an evaluation circuit (11) for computing the driving direction. For compensating inclination dependent angle errors on the indicator of the drive direction the inclination angle of the earth field is fed into the evaluation circuit (11) as a calibration dimension (E), subsequently the inclination angle (.psi.) of the vehicle is established cyclically by means of an inclination measuring device (12) and then the corrected driving direction (.theta.) is established from the computed driving direction (.theta.') as well as from the calibration dimension (E) and the angle of inclination (.psi.) in accordance with the equation .theta.=f (.theta.',.psi.,E). This corrected driving direction can then be further processed or issued to an indicator (13) (FIG. 1).