| 摘要 |
<p>A wide implement (12) such as a planter is towed by a tractor (10) and has a ground marker (18) at one lateral end. A video camera (56) at the other lateral end of the implement views the mark made in a previous pass and provides an image to the driver on a display unit (28) on the tractor so that the driver can follow the mark in spite of the wide offset between the mark and the drivers position. In order to avoid problems with over steering an angle sensor is provided between the tractor drawbar (16) and the implement hitch (14). The signal from this sensor controls a servo-mechanism which aims the camera (56) in azimuth so that it is always looking parallel to the direction of movement of the tractor (10).</p> |
