Patent ID: 9706696
Date: 2017-07-18
CPC Classifications: A01B,F16H

Claim:
1. A control system for a tractor having a transmission with a hydraulic drive circuit in which a hydraulic pump supplies pressurised fluid to a hydraulic motor, wherein said control system controls an operating condition of an implement attached to the tractor, wherein said control system comprises: a pressure sensing device which senses the pressure in the hydraulic drive circuit and provides a signal which is indicative of the current pull force necessary to pull the implement; and a control unit which receives the pressure signal and a second signal relating to the speed of the tractor and adjusts the current position of the implement to a new position when said pressure signal varies, characterized in that the new position lies within a pre-determined position range dependent on the second signal in order to limit the vertical displacement of the implement under changing operating conditions.