Model reference adaptive implement controlĬontrol system for a pulled load, particularly agricultural tractor-and-plough control system Vehicle with control system having operator-actuable switch for storing parameter signal value to control vehicle-connected implement raising and lowering structure Vehicle with control system for raising and lowering implement Method for depth adjustment of a tilling machineĮlectric circuit for controlling a tractor-pulled mounted device adjustable in height by a hydraulic jack Hitch control system with start-up lock-out Method for controlling an attachment to agricultural tractorsĮngine-sensing draft control system with multiple feedback compensation mechanisms As the hitch approaches the commanded position the system reverts to the normal filtering so that the system is more sensitive to the draft feedback signal.Īgricultural pulling machine with automatic pitch vibration damping mechanismĬontrol device for position-control of implement coupled to an agricultural vehicle The oscillations are caused by interaction of the weight of the implement bouncing because of the pneumatic tires on the tractor, and movement of the hitch to correct for the apparent change in draft. This makes the loop less sensitive to the draft feedback signal and reduces vibrations which would otherwise occur because of oscillations in the draft feedback signal. During rapid hitch movement commanded by movement of the quadrant lever while the implement is above the ground, the draft feedback signal, which is normally filtered to eliminate frequencies above about 3.2 Hz, is more heavily filtered to eliminate frequencies above 0.5 Hz. An operator-controlled quadrant lever provides command signals for commanding the positioning of the hitch relative to the ground. A tractor-mounted three-point hitch for pulling a tillage implement is controlled by a closed loop including draft sensors for sensing the draft on the hitch and providing a draft feedback signal.
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