Vdo Adolf Schindling Ag

Wolfgang Obst

Klaus Kronenberg

Robert Belz

Matthias Giron

A method is provided for synchronizing the counter of an electronic control device with the zero position, defined by a mechanical stop, of a pointer in an indicating instrument. The pointer is driven via a step-down gearing by a stepping motor having two windings perpendicular to each other and a two-pole rotor. The two windings are connected alternately to a source of voltage and to a measuring mechanism for determining the voltage induced in a winding not traversed by current. The pointer moves stepwise up to the mechanical stop, and the counter is set to zero in the absence of an induction. The method is substantially less expensive than prior methods. Upon an assembling of the stepping motor and the indicating instrument, a given alignment of the two-pole motor is associated with the zero position of the pointer, and the rotor is brought into this given alignment each time upon the start of the method. Thereupon the determination of the induction is effected each time only in the position of the rotor which follows this given alignment by one step.

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Schmitten, Germany

Wolfgang Obst