Connected and Automated Vehicles

Shift Reference Manual

Deshpande, Akash
Gollu, Aleks
Semenzato, Luigi
1997

This document is a reference manual for SHIFT, a description language for dynamic networks of hybrid systems. This model offers the proper level of abstraction for describing complex applications such as highway and air traffic control systems, robotic shopfloors, and other systems whose operation cannot be captured by conventional models. SHIFT is planned for use as a mechanism for defining the Automated Highway System Tool Interchange Format (AHSTIF). An automated highway system is a hybrid system with specific characteristics and restrictions. SHIFT supports the definition and...

Fault Tolerant Autonomous Lateral Control for Heavy Vehicles

Talbot, Craig Matthew
Papadimitriou, Iakovos
Tomizuka, Masayoshi
2004

This report summarizes the research results of TO4233, "Fault Tolerant Autonomous Lateral Control for Heavy Vehicles". This project represents a continuing effort of PATH's research on Automated Highway Systems (AHS) and more specifically in the area of heavy vehicles. Research on the lateral control of heavy vehicles for AHS has been going on at PATH since 1993. MOU129, "Steering and Braking Control of Heavy Duty Vehicles" was the first project and it was followed by MOU242, "Lateral Control of Commercial Heavy Duty Vehicle". Both projects were concerned mostly with the theoretical...

Moving Slot Concept for Automated Highway Control

Chin, Chi-nan
Hall, Randolf
2004

The objective of this report is to optimize performance of AutomatedHighway Systems through management of space accounting for interaction between entrance and exit processes. To accomplish this objective, we develop acomprehensive framework, including a new integrated highway model called the moving slot model, and operational strategies, called slot/lane assignment rules. Themodel manages highway space to maximize capacity accounting for safety and vehicle maneuvers. Operational strategies minimize space requirements by formingvehicles into specific patterns of destinations through entry...

Electronic Toll Collection System (ETC) User Survey

Yim, Youngbin
1991

This is a summary of several surveys concerning the use of an electronic toll collection system (ETC) among San Francisco Bay Area motorists. The objective of these surveys was to determine the level of interest in subscribing to an electronic toll collection service for Bay Area toll bridges. The issues addressed in the surveys were: (1) interest in the ETC service; (2) preferred types of automated vehicle identification (AVI) tags; (3) preferred location or placement of AVI tags on the vehicle; (4) desired method of payment for the ETC service; and, (5) perceived benefits of ETC.

Vehicle Following Control Design for Automated Highway Systems

Raza, H.
Ioannou, P.
1997

Automatic vehicle following is an important feature of a fully or partially automated highway system (AHS). The on-board vehicle control system should be able to accept and process inputs from the driver, the infrastructure and other vehicles, perform diagnostics and provide the appropriate commands to actuators so that the resulting motion of the vehicle is safe and compatible with the AHS objectives. The purpose of this paper is to design and test a vehicle control system in order to achieve full vehicle automation in the longitudinal direction for several modes of operation, where the...

Constraints on Initial AHS Deployment and the Concept Definition of a Shuttle Service for AHS Debut

Tsao, H. S. Jacob
1996

This paper proposes a shuttle van service as the initial deployment Automated Highway System (AHS) target. The freeway portion of the trip is fully automated and a professional driver is required for off-freeway driving. Advantages from the viewpoint of of different deployment issues are discussed. Focus is on the concept definition.

Fault Detection and Handling for Longitudinal Control

Yi, Jingang
Howell, Adam
Horowitz, Roberto
Hedrick, Karl
Alvarez, Luis
2001

The purpose of this project is to extend and integrate existing results on fault diagnostics and fault management for passenger vehicles used in automated highway systems (AHS). These re-sults have been combined to form a fault diagnostic and management system for the longitudinal control system of the automated vehicles which has a heirarchical framework that complements the established PATH control system. Furthermore, the fault diagnostic module effectively mon-itors all of the sensors and actuators required for longitudinal control, while the fault handling module corrects for any...

Transitional Platoon Maneuvers in an Automated Highway System

Hedrick, J. K.
Narendran, V. K.
Chang, K. S.
1992

This report deals with an introduction to the control aspect of platoon maneuvers in Automated Highway Systems. The different platoon maneuvers include lane changes, merge procedures and split procedures. The first part of the report consists of a review of the existing literature in this area. The survey is split up into the quasi-synchronous and vehicle follower controller methods of approach to the problem. The subsequent sections deal with the mathematical description of the problem with two representations of the system under study, varying only in level of model complexity. The...

Evaluation of the Transit Information System in Southern California

Le Colletter, Emmanuel
Yim, Youngbin
Hall, Randolph
1993

This report presents a study of the effectiveness of the transit telephone information system on trip behavior at Metropolitan Transit Authority ( MTA), from both the user's and the operator's perspective. The objectives of the experiment were: 1) to assess the perception of dynamic transit information service, 2) to identify the media which can most effectively disseminate transit information, and 3) to compare the information service by human operators with the service by an automated system. The study looks at both the supply and the demand side of the provision of telephone information...

Traffic Flow Control in Automated Highway Systems

Alvarez, Luis
Horowitz, Roberto
1997

This report studies the problem of traffic control in the Automated Highway System (AHS) hierarchical architecture of the California PATH program. A link layer controller for the PATH AHS architecture is presented. It is shown that the proposed control laws stabilize the vehicular density and flow around predetermined profiles.