OpenFields

Tractor – Implement Force Measurement

This paper evaluates different three point linkage force measurement systems, considers their design and implementation, and considers the accuracy and sensitivity of the instrumentation used. The effect of vehicle attitude and tyre deflection and sinkage are also included.

Year of Publication2009

As part of a system to determine real time tractive efficiency tractor-implement force measurement is required. Although tractors have become much more technologically advanced through the use of CANBus systems, there has been little further development on linkage force measurement and performance other than draught control, lower pin sensing and developments in wheel slip measurement. At present there are no automatic control systems on tractors that allow tractive efficiency to be maximized. An instrumented three point linkage (measuring the tension/compression in the top link, lift rods and lower lift arms and the angle of the lift arms) allows calculation of an implement draught force, its vertical force (weight addition) and the point at where it acts in the longitudinal vertical plane. From the tractor and implement kinematics and the static axle loads the dynamic wheel loads can be calculated. This paper evaluates different three point linkage force measurement systems, considers their design and implementation, and considers the accuracy and sensitivity of the instrumentation used. The effect of vehicle attitude and tyre deflection and sinkage are also included. Field test data is included in the evaluation.

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Additional keywords/tags

tractor dynamicstractor kinematicstractive efficiencyimplement force predictioninstrumented linkage
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Supporting the development of the national rural economy.

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