Patent ID: 7411521
Filing Date: 2008-08-12
Classification: G05G,Y10T

Abstract:
1. A control system, comprising; a control input device having a movable magnet; a pole-piece frame arrangement positioned about the magnet, and positioned therein at least two first magnetic flux sensors for sensing movement of the magnet along a first axis, said at least two first magnetic flux sensors being positioned about said magnet such that, in the absence of failure of one of said flux sensors, the flux measured by said at least two first magnetic flux sensors is substantially the same within a predetermined threshold value; a monitoring arrangement for monitoring the output signal of each of the at least two first sensors; wherein the output of said at least two magnetic flux sensors is compared and a control input signal representative of movement of the control input device is only transmitted to a control process if the difference between said outputs of said at least two first magnetic flux sensors is less than said predetermined threshold value.