Vehicle-following in an automated-guideway transit (AGT) system is a longitudinal control scheme where the state of a given vehicle is determined by the behavior of the preceding vehicle. The study represents the initial phase of an investigation that is to be continued in order to determine the feasibility of implementing a state-constrained vehicle-following controller into a real system. The report documents an investigation into the automatic longitudinal control of vehicles using a vehicle-follower strategy in the short-headway range operation (0.5 to 3 s). The study states that at short time headways a kinematic constraint on vehicle operation arises as a consequence of the velocity, acceleration, and jerk limits imposed to assure passenger comfort. This constraint requires a trailing vehicle to maintain a spacing such that it may react to nominal preceding-vehicle maneuvers without collisions and without exceeding service jerk and acceleration limits. A nonlinear feedback controller is designed to force the vehicle to follow the kinematically required spacing until the desired headway is attained. The design is based on a technique that uses an optimal feedback control with state constraints. Several suboptimal controls with reduced informational requirements are also presented, thus producing an easily instrumentable controller that properly responds to all possible nominal maneuvers of a preceding vehicle. This report concludes that the technique presented has shown to admit a workable solution to the vehicle-following problem at short headways.


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    Title :

    A State-Constrained Approach to Vehicle-Follower Control for Short-Headway AGT Systems


    Contributors:
    A. J. Pue (author)

    Publication date :

    1977


    Size :

    123 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English