Apparatus for determining the angular position of a rotating member using reference and position elements that generate opposite polarity bipolar signals
AssigneeFabbrica Italiana Magneti Marelli S.p.A.
InventorFranco Huwyler
Life of this patent
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Abstract
A system utilizing a single sensor for locating angular positions of a rotating member relative to an angular reference position is provided with means which, for each revolution of the rotating member, generates a bipolar reference signal at the reference position and a bipolar position signal of reversed polarity from the bipolar reference signal. At the second half waves of the bipolar reference and position signals respective unidirectional reference and position signals are generated. The latter are converted to logic signals corresponding to angular positions of the rotating member relative to the reference position and the unidirectional reference signals are utilized to control cycle repetition.
Claims6
Apparatus for determining the angular position of a rotating member, said member having a reference element and a plurality of position elements, the structure of said reference element being different from the structure of said position elements, said elements being angular spaced about said rotating member in the direction of rotation said apparatus comprising:
- sensor means responsive to the relative structure of the reference and position elements for generating a bipolar reference signal each time said reference element moves past a reference point and for generating a bipolar position signal each time one of said position elements moves past said reference point, each of said bipolar reference and position signals comprising an alternating positive and negative pulse, the order of occurrence of said positive and negative pulses of said bipolar reference signal being opposite to that of the bipolar position signals;
- discriminator means responsive to the order of said positive and negative pulses of said bipolar reference and said bipolar position signals for distinguishing between said bipolar reference and said bipolar position signals and, for generating a unipolar reference signal or a unipolar position signal each time said sensor means generates one of said bipolar reference or one of said bipolar position signals, respectively;
- signal generating means responsive to said unipolar reference and unipolar position signals for generating an output signal indicative of the angular position of said rotating member relative to said reference point.
Dependencies are inferred from the claim text.