Sliding Mode Control of Automatic Guidance of Farm Vehicles in the Presence of Sliding

Satisfactory results of automatic guidance of farm vehicles have been achieved in previous works as long as vehicles move without sliding, but unfortunately in agricultural applications, sliding always occurs inevitably which causes loss of accuracy. In this paper the problem of path following control of autonomous farm vehicles subject to sliding is addressed. To take sliding effects into account, a vehicle-oriented kinematic model is built in which sliding effects are integrated in the form of additive disturbances to the ideal kinematic model. By transforming the vehicle-oriented kinematic model into a perturbed chained system, a sliding mode controller, which is robust not only to the sliding effects but also to the input noise, is designed with the help of the natural algebraic structure of chained systems. Simulation results show that the proposed control law can guarantee high path-following accuracy even in the presence of sliding.

[1]  I. Motte,et al.  Control of sliding mobile robots : a slow manifold approach , 2000 .

[2]  J. Barbot,et al.  One-chained form and sliding mode stabilization for a nonholonomic perturbed system , 2000, Proceedings of the 2000 American Control Conference. ACC (IEEE Cat. No.00CH36334).

[3]  Maria Letizia Corradini,et al.  Experimental testing of a discrete-time sliding mode controller for trajectory tracking of a wheeled mobile robot in the presence of skidding effects , 2002, J. Field Robotics.

[4]  Christian Laugier,et al.  Sliding Mode Control for Nonholonomic Mobile Robot , 2000 .

[5]  William Leroquais,et al.  Vibrational control of wheeled mobile robots not satisfying ideal velocity constraints: The unicycle case , 1997, 1997 European Control Conference (ECC).

[6]  Philippe Martinet,et al.  Automatic Guidance of a Farm Tractor Relying on a Single CP-DGPS , 2002, Auton. Robots.

[7]  G. Campion,et al.  Control of Wheeled Mobile Robots Not Satisfying Ideal Velocity Constraints - a Singular Perturbation Approach , 1995 .

[8]  Philippe Martinet,et al.  Adaptive control for car like vehicles guidance relying on RTK GPS: rejection of sliding effects in agricultural applications , 2003, 2003 IEEE International Conference on Robotics and Automation (Cat. No.03CH37422).

[9]  Yulin Zhang,et al.  Variable Structure Control of a Differentially Steered Wheeled Mobile Robot , 2003, J. Intell. Robotic Syst..

[10]  Zhong-Ping Jiang,et al.  A robust adaptive backstepping scheme for nonlinear systems with unmodeled dynamics , 1999, IEEE Trans. Autom. Control..