Abstract
Agricultural tractors are often subjected to variety of functions on farm like cultivation of field with different implements ranging from light to heavy implements. These implements are usually coupled to the three point linkages on tractor structure which allows the implement to be raised and lowered with respect to the tractor through hydraulic actuators. In typical farm operations, tractors are often driven with heavy implements attached to the three point linkages in lifted conditions, where tractor is travelling at higher speed to commute from field to field. During transportation mode at high speed and/or across uneven terrain the tractor is, due to weight of the implement produces considerable pitching vibrations, which leads to difficulty in controlling the tractor. These pitching vibrations reduces the front axle load and the road contact of the front wheels, which thereby lost from time to time based on vehicle speed, weight of an implement and operating terrain profile. This tractor bouncing phenomenon prevents the effective steering of the vehicle during such tractor applications and thus creating a hazardous situation to driver. This research work depicts development of electronic active vehicle stability control system design and calibration for agricultural tractor with hinged implement. This research work also provides a better stability control of the vehicle with hinged implement kept at lifted condition which is being transported irrespective of change in weight of an implement, driving speed, implement lift height etc. Adaptive control system is developed for lifting and lowering an implement to attenuate the vibration caused by the implement overhang. This system provides a relative motion between implement and the tractor to reduce the pitching movement of the agricultural tractor during transportation condition. Use of minimal sensor for system control and calibration delivers cost effect solutions