Method of detecting a reference zone arranged on the...

Details Method of detecting a reference zone arranged on the... Method of detecting a reference zone arranged on the...

2011-05-17

2011-05-17

Teixeira Moffat, Jonathan C. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Orientation or position

C702S145000

Reexamination Certificate

active

07945421

ABSTRACT:
A method of detecting a reference zone formed on the periphery of a toothed disk integral with a rotary part, for determining the angular position of the rotary part. According to this detection method, when a reference zone is expected and at the time of the detection of a tooth (n) at a time tn, there is defined a time window [tmin, tmax] of duration depending on the time period Tnseparating the detection of the tooth (n) and the detection of the preceding tooth (n−1), and the reference zone is considered present in the absence of detection of a tooth (n+1) during the time window [tmin, tmax]. Moreover, the duration of each time window [tmin, tmax], calculated from a measured time period Tn, is adjusted by modulating that duration by a correction parameter equal to ΔT=Tn−Tn−1.

REFERENCES:
patent: 4697168 (1987-09-01), Baker
patent: 4797827 (1989-01-01), Cockerham
patent: 1 462 638 (2004-09-01), None
patent: 2 818 737 (2002-06-01), None
patent: 2 860 069 (2005-03-01), None

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