Wire-reference configurations in vehicle lateral control

• Published in: IEEE transactions on vehicular technology 1977-05, Vol.26 (2), p.161-172
• Main Author: Olson, K.W.
• Format: Article
• Language: English
• Subjects: Automatic control; Automatic testing; Building materials; Distortion measurement; Magnetic analysis; Magnetic field measurement; Magnetic fields; Magnetic materials; Magnetic sensors; Vehicles
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/T-VT.1977.23673

Lateral control is an essential function for all forms of individual automated ground transport. Here two aspects of such control--the magnetic field distributions associated with a guideway-based, wire-reference configuration, and the associated vehicle-based sensors--are reviewed. Two wire-reference schemes have thus far been suggested. In the first, the amplitude characteristics of the magnetic field are employed to obtain the lateral control signal. In this paper, a theoretical analysis and detailed field measurements are used to define both "ideal" characteristics and those which would be encountered in a realistic operating environment. The resulting problems, which involve amplitude distortions of the field due to the proximity of steel-reinforcing materials, are defined, and their effects on vehicle control--poor tracking and passenger discomfort--are discussed. In the second approach, the lateral control signal is primarily dependent on the phase characteristics of the magnetic field. A theoretical analysis and a corresponding experimental field study, which are discussed herein, indicated that the problems associated with the first approach were largely overcome, as evidenced by successful full-scale tests of an automatically steered vehicle.