Vdo Adolf Schindling Ag

Frank Gohring

Erwin Schneider

Harald Frey

In a device for detecting a position of an object (linear or circular strip) moving in rotation or translation relative to a base, an incremental track bearing periodically recurring marks and two index tracks bearing a plurality of index marks are scanned by sensors. These sensors supply analog signals which are complementary to each other. In each case, two complementary signals are combined to form a logical track. By a combining of the logical tracks with each other, a further logical track is formed which contains a serial code which corresponds to the absolute value of the position of the object.

Device for detecting a position of an object moving in rotation or

A device for producing an electric signal which corresponds to the position of an object which is movable in translation or rotation relative to a base, wherein by optical scanning of markings which periodically recur upon a movement of the object, analog voltage signals A, A and B, B are produced by means of sensors which are spaced apart from each other by one-quarter of the scanning period. The signals are converted in an evaluation circuit with comparators into digital forms of the signals A and B (quadrature signal). In order to produce a test signal S, there is also provided in the device a summation circuit by means of which the voltage signals A, A and B, B are added and compared in a comparator with a threshold value.

Position indicator

A load adjustment device for an internal combustion engine includes a throttle valve (4) which can be acted on via a the setting element (8) on the accelerator-pedal side and, also by an electromotive setting drive (12), their movements being decoupled. In order to be able to note both the idle position of the setting element (8) and a driver's wish for 'idle' and, furthermore, the actual position value of the electromotive setting drive (12) for a position control circuit and the throttle-valve position for injection electronics, there is a drive potentiometer (25) associated with the electromotive setting drive (12). Also a throttle-valve potentiometer (24) is associated with the throttle valve (4). The drive (12) and the potentiometer (24) have a common support plate (19) which is fastened, fixed for rotation, to the drive shaft (11) of the electromotive setting drive (12). There are two wiper paths (21, 20), a wiper (21) for the drive potentiometer (25) being arranged fixed on the housing and a wiper (20) for the throttle-valve potentiometer (24) fastened, fixed for rotation, to a further setting element on the throttle-valve side. The further setting element is developed as throttle-valve shaft (5). Alternatively the two potentiometers may be provided with different support plates, one plate operating with the electromotive setting drive and the other plate operating with the accelerator setting element.

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Frankfurt-am-Main, Germany

Frank Gohring