2026/04/21 by Rentaro Iwai, Natsuki Hikasa, Hiroshi Okajima
#eess.SY #cs.SY
This paper presents a robust path following control method for vehicles that explicitly incorporates steering torque dynamics into the control model. Unlike conventional approaches that treat the steering angle as a direct control input, this study models the steering angle as a state variable driven by a torque-proportional steering command against a speed- and angle-dependent resistance term. Since the resistance coefficient depends on road surface properties and is difficult to determine precisely, it is treated as an uncertain parameter. To compensate for the resulting model error, a Model Error Compensator (MEC) is employed as an add-on compensator that feeds back the discrepancy between the actual plant and a nominal model running in parallel, without requiring an explicit plant inverse or a specific canonical form. The zero dynamics arising from the path following formulation are formally analyzed, and it is shown that they are stable for any positive rear cornering power. Numerical simulations under systematic parameter mismatch conditions (C/CM=0.5 to 2.0) demonstrate that the proposed method reduces the maximum following error by more than 90% compared to the conventional method without MEC throughout the tested mismatch range, and maintains practical tracking performance within a mismatch range of 0.75 <= C/CM <= 1.25. These results confirm that MEC effectively suppresses the influence of steering torque uncertainty, significantly enhancing path following robustness.