Coding method and device for determining absolute angular position
AssigneeS.N.R. Roulements
InventorPascal Desbiolles
Life of this patent
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Abstract
Method for coding at least one datum using three digital signals A, B, C delivered on respectively one channel, in which the third signal C is delivered by a combination of the first two signals A, B in order to form m binary triplets, where m<8. The method provides for modifying the third signal C according to the data to be coded in order to generate n binary triplets, where n>1, the n triplets being different from the m triplets. A device for determining the absolute angular position of a turning member is described.
Claims9
A method for coding at least one datum using three digital signals A, B, and C delivered on respectively one channel comprising the steps of delivering a third signal C by a combination of first and second signals A, B in order to form m binary triplets, where m<8, and modifying the third signal C according to data to be coded in order to generate n binary triplets, where n>1 and said n binary triplets being different from the m binary triplets.
A device for determining an absolute angular position of a rotating member, said device comprising:
- a coder designed to be integral with the rotating member, said coder being arranged to deliver two pseudo sine signals;
- a sensor designed to be fixed at reading distance from the coder, said sensor comprising sensitive elements that are capable of detecting the signals delivered by the coder;
- a device for processing the signals issuing from the sensor, said device being arranged to deliver three digitals A, B, and C, the signals A and B being representative of the angular position of the coder and the signal C being obtained by a combination of the signals A and B in order to comprise at least one reference pulse, the respective status of the three signals A, B, and C forming m binary triplets, where m<8;
- a central processing unit connected to the processing device, said central processing unit being arranged to use the signals A, B, and C on respectively one channel;
- and
- the processing device further comprising coding means for modifying the signal C, said coding means being designed, according to the reception of a datum to be coded, to modify the signal C in order to generate a binary triplet different from the m triplets, and the central processing unit comprising means for detecting said triplet.
Dependencies are inferred from the claim text.