Electricity: motive power systems – Positional servo systems – Vehicular guidance systems with single axis control
Patent
1988-12-15
1990-04-17
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Vehicular guidance systems with single axis control
180168, 180169, 318580, 36442401, 36442402, B64C 1318, G05D 102
Patent
active
049183621
ABSTRACT:
An industrial truck comprising at least one steerable wheel is to be guided in dependence on direction-controlling signals which are transmitted to the industrial truck. At a junction the truck receives a direction-controlling steering signal, which causes the at least one steerable wheel to be laterally offset from the guiding signal line until a signal equilibrium which depends on the offset has been established in the steering controller. In dependence on the distance traveled and/or on time, a resetting signal is received which causes the steering means to return to an operating condition in which the vehicle is centered over a signal guiding line to be followed. The signals are transmitted by a guiding signal line, which is buried in the ground and cooperates with a sensor, which is provided at the center of the vehicle and scans the guiding signal line so as to control the deflection of steerable wheels of the vehicle. When a branch to the left or right extends from the straight guiding signal line, a signal calling for a lateral offset from the guide wire (4; 15, 16) is delivered and maintained for causing the vehicle to move along a course that is parallel to the guide wire (4; 15, 16). That parallel offset travel is continued until a signal for resetting the vehicle to a centered position over the guide wire is received.
REFERENCES:
patent: 3245493 (1966-04-01), Barrett
patent: 3738443 (1973-06-01), Kubo
patent: 4258813 (1981-03-01), Rubel
patent: 4566032 (1986-01-01), Hirooka et al.
patent: 4577140 (1986-03-01), Schmidt et al.
patent: 4716530 (1987-12-01), Ogawa et al.
patent: 4736812 (1988-04-01), Livneh
Christensen Sven
Haelbich Rolf
Hanel Jurgen
Hoener Siegfried
Pridat Volker
Firma Jungheinrich Unternehmensverwaltung KG
Ip Paul
Shoop Jr. William M.
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