Patent ID: 8324890

Claim:
Apparatus comprising: at least one magnet disposable inside an engine transmission casing and being movable by an engine clutch mechanism in the casing as the engine clutch mechanism moves; at least one flux concentrator disposable outside the engine transmission casing to concentrate magnetic flux from the magnet; at least a first Hall sensor juxtaposed with the flux concentrator and generating a first signal in response to a magnetic field; at least a second Hall sensor juxtaposed with the flux concentrator and generating a second signal in response to a magnetic field; and at least one position determination circuit receiving the first and second signals and based thereon outputting a signal representative of linear position of the engine clutch mechanism, wherein the position determination circuit combines the first signal and second signal such that the signal representative of the linear position of the clutch mechanism is less affected by variation in a spacing gap between the flux concentrator and magnet than are the individual signals from the first Hall sensor and the second Hall sensor.