| 摘要 |
1,205,197. Automatic steering control. SOC. FRANCAISE D'EQUIPEMENTS POUR LA NAVIGATION AERIENNE. April 9, 1969, No.18266/69. Heading G3R. In an automatic steering system for a vehicle, the difference in position between elements indicating measured and desired headings operates, by way of a shaped cam with lost motion, a rotary electrical heading correcting signal generator, movement of the rotor of which is thus limited to less than 180 degrees even when a turn greater than 180 degrees is selected. In Fig.2 heading is indicated against a fixed pointer 7 by a repeater compass card 1 driven by a follow-up servomotor 5 associated with a synchro transmission from a remote compass. A pointer 8 is movable relative to card 1 to set a desired course by manual or motor operation of a shaft 12. Coupled to pointer 8 is a spring-loaded cam follower 20 which, when pointer 8 coincides with pointer 7 and the selected course is being maintained,-rests in a hollow 15a in a cam 15 coupled to the rotor of a synchro or potentiometer transmitter 13 so that spigot 17 is midway between stops 18a, 18b on the stator and the output of the transmitter is zero. When a new heading is selected, follower 20 is moved in a corresponding direction and the output of transmitter 13 increases until spigot 17 reaches a stop, the output then remaining constant for any further movement of the follower up to the point 15c of the cam thus permitting a turn of more than 180 degrees. The output of transmitter 13 adjusts the heading until servomotor 5, operating through a differential gear 11, brings pointer 8 into coincidence with pointer 7 again. In a modification, the position of stops 18a, 18b is adjustable to counter lateral drift.
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