Investigation of a New Orbital Steering Concept With Focus on the Control Loop Performance

This paper investigates a new asymmetric steering concept within orbital steering units called OSPS, which asymmetry enables new steering features for the operator of the vehicle compared to traditional OSP variants. A traditional orbital steering unit functions as a proportional valve system with a certain overlap, where the operator input to the steering wheel will initiate the rotation of the wheels with a small dead-band of 2–3 degrees. The new asymmetric unit functions instead as a proportional valve system with a certain under-lap, where the operator will initiate the rotation of the wheels directly related to the steering wheel rotation instead. The objective with this paper is to evaluate the closed loop performance for the new asymmetric concept, because the right and left control loop is changed compared to a tradional OSP unit.