Reverse direction guidance system for lift truck

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