Constraint-based planning and control for safe, semi-autonomous operation of vehicles

TitleConstraint-based planning and control for safe, semi-autonomous operation of vehicles
Publication TypeConference Paper
Year of Publication2012
AuthorsAnderson, S.. J.
Conference NameIntelligent Vehicles Symposium (IV), 2012 IEEE
Date PublishedJune
Keywordsautomation-determined path, collision avoidance, constraint-based approach, constraint-based control, constraint-based planning, geometric constructs, geometric heuristics, hazard avoidance, Hazards, high-speed teleoperation, homotopic classes, human-machine interaction, human-machine systems, Humans, man-machine systems, mental models, minimally-invasive control, navigation, obstacle avoidance, off-road environments, path planning, path tracking, Planning, remotely operated vehicles, road safety, safe vehicle operation, Semi-Autonomous control, semi-autonomous vehicle operation, shared adaptive control, situational awareness, stability, stability control, teleoperation, threat-based feedback mechanisms, Torque, unmanned ground vehicle, unmanned ground vehicles, vehicle dynamic constraints, vehicle dynamics, Vehicles, Wheels
Abstract

This paper presents a new approach to semi-autonomous vehicle hazard avoidance and stability control, based on the design and selective enforcement of constraints. This differs from traditional approaches that rely on the planning and tracking of paths. This emphasis on constraints facilitates “minimally-invasive” control for human-machine systems; instead of forcing a human operator to follow an automation-determined path, the constraint-based approach identifies safe homotopies, and allows the operator to navigate freely within them, introducing control action only as necessary to ensure that the vehicle does not violate safety constraints. The method evaluates candidate homotopies based on “restrictiveness”, rather than traditional measures of path goodness, and designs and enforces requisite constraints on the human's control commands to ensure that the vehicle never leaves the controllable subset of a desired homotopy. Identification of these homotopic classes in off-road environments is performed using geometric constructs. The goodness of competing homotopies and their associated constraints is then characterized using geometric heuristics. Finally, input limits satisfying homotopy and vehicle dynamic constraints are enforced using threat-based feedback mechanisms to ensure that the vehicle avoids collisions and instability while preserving the human operator's situational awareness and mental models. The methods developed in this work are shown in simulation and experimentally demonstrated in safe, high-speed teleoperation of an unmanned ground vehicle.

DOI10.1109/IVS.2012.6232153
Citation Key6232153
 

Dynamics and Control Systems Lab

 

Robotic Mobility Group

 

Aerospace Robotics and Embedded Systems Laboratory

About us

We are three research groups from Georgia Tech, the Massachusetts Institute of Technology, and the University of Southern California, collaborating to perform basic research on high-speed autonomous driving.  We are most interested in researching biologically-inspired methods in the realms of both perception and control.

Acknowledgment

This work was supported by the Army Research Office under MURI Award W911NF-11-1-0046.