Reverse direction guidance system for lift truck

Details Reverse direction guidance system for lift truck Reverse direction guidance system for lift truck

G - Physics

05

D

341/84

G05D 1/02 (2006.01) B62D 1/28 (2006.01) B66F 9/075 (2006.01)

Patent

CA 1073544

REVERSE DIRECTION GUIDANCE SYSTEM FOR LIFT TRUCK ABSTRACT An automatic guidance device for a self-powered cargo moving vehicle operated by a vehicle-borne sensor which follows a buried, energized wire path and which includes sensor means mounted either between the fixed and steerable axles or in front of the fixed axle of the vehicle for guiding the vehicle when it travels in a direction such that the fixed axle precedes the sensor by effectively generating a position error signal relative to the direction of travel. In one preferred embodiment the sensor includes a pair of sensing coils whose outputs are com- bined to generate an error signal V=(1+K)R-KF where R and F are the difference of outputs of a pair of rear and forward sensors, respectively, and K is equal to the ratio of the distance of the rear pair of coils to the virtual sense point and the distance between the rear and forward pairs of coils.

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