Reverse direction guidance system for lift truck

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

1979-04-19

1981-01-27

Sheridan, Robert G.

Motor vehicles

With means for controlling operation responsive to...

Having controlling means adapted to interact with stationary...

318587, B62D 128

Patent

active

RE0304921

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 combined 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.

REFERENCES:
patent: 3029890 (1962-04-01), Mountjoy
patent: 3218461 (1965-11-01), Saunders
patent: 3322225 (1967-05-01), Kohls
patent: 3606933 (1971-09-01), Rushing
patent: 3628624 (1971-12-01), Wesener
patent: 3653456 (1972-04-01), Vemura
patent: 3667564 (1972-06-01), Schnell
patent: 3669209 (1972-06-01), Brooke
patent: 3757887 (1973-09-01), Moore
patent: 3948342 (1976-04-01), Pircher

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