Patent ID: 9103744
Filing Date: 2015-08-11
Classification: F01D,G01M,G01P

Abstract:
1. A method for redundant detection of a rotational direction of a body having a rotary axis, the method comprising: (a) generating at least three sensor signals using at least three sensors arranged offset around the rotary axis; (b) at a first time during a rotational period of the body, comparing a first sensor signal of the at least three sensor signals with a second sensor signal of the at least three sensor signals; (c) determining the rotational direction of the body based on comparing the first sensor signal with the second sensor signal; (d) determining a number of flanks of the second sensor signal that occur during one rotational period of the first sensor signal; and (e) if the number of flanks of the second sensor signal indicate an error in the second sensor signal, determining the rotational direction of the body based on comparing the first sensor signal with a third sensor signal of the at least three sensor signals.