A pulse generator for the generation of pulses which are synchronously associated with the movement of a mechanical part comprises a toothed element, the teeth of which run past a pick-up head, the pick-up head comprising a first winding fed by a carrier frequency, which produces a field which is modulated by the teeth of the element and a second winding in which a voltage is induced by the modulated field, the induced voltage is supplied to a phase discriminator which produces a pulse sequence having a keying ratio proportional to the relative phase position of the induced voltage and the carrier frequency and the pulse sequence is fed to an integration element which produces a voltage signal proportional to the keying ratio.
In an angular pulse generator having a movable generator part and a read head, the read head has a primary winding (W1) fed with an alternating voltage of a defined frequency and has a secondary winding (W2) whose induced secondary voltage is modulated by passing teeth and intervening gaps of the generator part. An evaluation unit evaluates the phase difference between the alternating voltage and the secondary voltage and forms a pulse for every passing tooth. A stray flux return line surrounds the primary winding (W1), so that the majority part of the primary flux linked to the primary winding (W1) flows via the stray flux return line for a large gap distance of the generator part.
Apparatus for detecting at least one predetermined angular position on rotating devices, having a tachogenerator with a stator part and a rotor part for producing a tacho signal with speed-dependent frequency. The stator and rotor parts of the tachogenerator form at least four circumferentially directed, substantially equidistantly spaced pole areas. For the purpose of an angular position-dependent amplitude modulation, a pole clearance is provided in at least one of the pole areas in both the stator part and the rotor part of the tachogenerator. An envelope amplifier with a threshold value stage is preferably connected in series with the tachogenerator and essentially only permits the passage of the angular position signals resulting from the coincidence of pole clearances in the rotor and stator parts of the tachogenerator.
A timing arrangement incorporates a timing disk having absolute marks arranged about a circle and serving for the identification of the angular position of the shaft of an internal combustion engine. The marks include a code track havig code marks and absolute marks, each absolute marks being preceded by a code element comprising a number of code marks. Each absolute mark is identified by a code section preceding and consisting of two or more code elements.
The generator wheel is composed of a tooth part and of a marker part. The tooth part has a rotational axis and a coaxial tooth or toothed edge in the shape of a circular ring with teeth situated distributed over its circumference, some of said teeth being marker teeth which include a recess. The marker part is secured to the tooth part and contains sheet metal strips corresponding in number to the number of marker teeth, said sheet metal strips projecting into said recesses of the marker teeth. Marker part and tooth part are composed of materials having different eddy current losses.
The invention relates to a device for measuring the angular position of a gear in a digital ignition system of an internal combustion engine, wherein an origin sensor responsive to the passage by of a pre-set tooth of a gear, is connected to one of inputs of a pulse former having a second input to which an output of a rectifier and filter circuit is connected; and an input of the rectifier and filter circuit is coupled to the output of an angle pulse sensor.
