A Theoretical Model of Speed-Dependent Steering Torque for Rolling Tyres

It is well known that the tire steering torque is highly dependent on the tire rolling speed. In limited cases, i.e. parking maneuver, the steering torque approaches the maximum. With the increasing tire speed, the steering torque decreased rapidly. Accurate modelling of the speed-dependent behavior for the tire steering torque is a key factor to calibrate the electric power steering (EPS) system and tune the handling performance of vehicles. However, no satisfactory theoretical model can be found in the existing literature to explain this phenomenon. This paper proposes a new theoretical framework to model this important tire behavior, which includes three key factors: (1) tire three-dimensional transient rolling kinematics with turn-slip; (2) dynamical force and moment generation; and (3) the mixed Lagrange–Euler method for contact deformation solving. A nonlinear finite-element code has been developed to implement the proposed approach. It can be found that the main mechanism for the speed-dependent steering torque is due to turn-slip-related kinematics. This paper provides a theory to explain the complex mechanism of the tire steering torque generation, which helps to understand the speed-dependent tire steering torque, tire road feeling and EPS calibration.

Language

  • English

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Filing Info

  • Accession Number: 01603938
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 7 2016 3:00PM