Guidance system for towed vehicles

Details Guidance system for towed vehicles Guidance system for towed vehicles

1978-01-12

1979-12-25

Stouffer, Richard T.

Earth working

Driven from or guided by stationary object, or anchored

Dragline scraper

172324, 172679, 280468, 280476R, A01B 6900

Patent

active

041801334

ABSTRACT:
An automatic guidance system for towed vehicles is disclosed comprising a marker, a position sensor, an electronic operational amplifier circuit, an electrical servo controlled hydraulic valve, and a hydraulically controlled swinging draw bar hitch. The position sensor comprises a follower to follow the furrow mark in the ground made by the marker on the preceding pass of the farm implement over the ground and variable resistors mounted on the followers electrically connected to the amplifier circuit. The electrical servo controlled hydraulic valve is driven by the operational amplifier circuit in response to the varying output voltages received from the variable resistors responding to the position of the follower. The position of the towed implement relative to the furrow mark is adjusted by the action of the hydraulically controlled swinging draw bar responding to the operation of the electrical servo controlled hydraulic valve. Deviation of the towed implement from its desired position relative to the furrow mark is detected by the position sensor and corrected by the movement of the hydraulically controlled swinging draw bar responding to the variable resistor outputs of the position sensor via the operational amplifier circuit and electrical servo controlled hydraulic valve. An adjustment apparatus is provided to enable the operator to change the angular displacement of the follower necessary to actuate the electrical servo controlled hydraulic valve, thereby allowing various degrees of implement positioning error. A control switch is provided to allow manual regulation of the servo controlled hydraulic valve and thereby manually control the swinging draw bar to position the implement.

REFERENCES:
patent: 2316397 (1943-04-01), Briscoe
patent: 2622891 (1952-12-01), Knapp
patent: 2788227 (1957-04-01), Wallace
patent: 3391663 (1968-07-01), Cagle et al.
patent: 3537531 (1970-11-01), Fischer et al.
patent: 3603405 (1971-09-01), Arnold et al.
patent: 3765501 (1973-10-01), Burvee

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