Electricity: motive power systems – Positional servo systems – Vehicular guidance systems with single axis control
Patent
1994-07-18
1995-10-24
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
Vehicular guidance systems with single axis control
180169, 364449, G01S 1302, G05D 100
Patent
active
054612926
ABSTRACT:
A remote control method of guidance for a work vehicle including a handheld control unit, an antenna/transponder placed on the periphery of the worksite, a controlling unit on the work vehicle itself. The control unit compares timing signals to subsequently control of the speed of independently powered wheels. There is a manual and automatic mode of control for the vehicle. The vehicle is positioned at a starting point by the user, and upon activation of the automatic mode, a timing pulse, either ultrasonic or electromagnetic is issued from the control unit on the vehicle. When the pulse is sensed by the transponder on the antenna, a responding pulse is transmitted. This is, in turn, received by the vehicle and thus a base time is set for the interval between the transmission of the pulse and the return signal from the transponder, the interval being indicative of the distance between them. The vehicle moves forward while continuing at intervals to send the pulse and if the secondary timing interval is larger than the base interval, the inner wheel is slowed to bring the vehicle closer. If the interval is shorter, the inner wheel is speeded up to move the vehicle away from the transponder. Thus, the vehicle describes a smooth arc about the transponder until the user sends another signal to the device, indicating that the device is to move a preset distance further away from the transponder, reset the base interval, and continue.
REFERENCES:
patent: 3808426 (1974-04-01), Birkin
patent: 3810179 (1974-05-01), Merrick
patent: 4156873 (1979-05-01), Moore
patent: 4728955 (1988-03-01), Hane
patent: 4878003 (1989-10-01), Knepper
patent: 4905009 (1990-02-01), Ulich et al.
patent: 5347274 (1994-09-01), Hassett
patent: 5387916 (1995-02-01), Cohn
Ro Bentsu
Siemens Terrance L.
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