Rotational angel detector with rotational-angle...

Details Rotational angel detector with rotational-angle... Rotational angel detector with rotational-angle...

2007-03-30

2009-06-16

Patidar, Jay M (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S207250

Reexamination Certificate

active

07548058

ABSTRACT:
A small-sized rotational angle detector can output both the absolute rotational angle α including the frequency of the steering shaft and the relative rotational angle signal. The amount of change of the absolute rotational angle is calculated on a sampling-period basis. A transition interval is determined based on the sampling period and the amount of change of the absolute rotational angle. Based on the preset pulse pattern, A-phase, B-phase and Z-phase pulses transitioning at the transition intervals are generated. Assuming that the amount of change of the absolute rotational angle in the sampling period of 10 ms is 2°, 2.5 ms obtained by dividing the sampling period 10 ms by the range of change 4 converted based on a predetermined unit 0.5° of the absolute rotational angle region, is defined as a pulse transition interval. The pulses are outputted as a relative rotational angle signal. Unnecessity of large-diameter disk having slits enables reducing the size of the entire detector and enhancing the degree of shape freedom.

REFERENCES:
patent: 5880586 (1999-03-01), Dukart et al.
patent: 6507188 (2003-01-01), Dilger et al.
patent: 2006/0006861 (2006-01-01), Heinze et al.
patent: 2007/0252590 (2007-11-01), Kondo
patent: 2008/0094058 (2008-04-01), Kawashima et al.
patent: 2003-202224 (2003-07-01), None

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