PATH

Assessing the Benefits and Costs of Intelligent Tranportation Systems: Ramp Meters

Kang, Seungmin
Gillen, David
1999

This study undertakes an evaluation of the benefits and costs of ramp metering. The primary purpose was to provide empirical information on the value of the introduction and use of this form of ITS technology. Three cases are examined in the analysis. The impact of ramp metering on traffic behavior is simulated based on a cell transmission model and an assumed travel demand on the freeway as well as the ramp. Temporal travel demand change is determined based on the average travel pattern obtained from the I-880 freeway database. Isolated, single traffic responsive ramp metering is assumed...

State-of-Health Estimation Pipeline for Li-ion Battery Packs with Heterogeneous Cells

Gill, Preet
Zhang, Dong
Couto, Luis D.
Dangwal, Chitra
Benjamin, Sebastien
Zeng, Wente
Moura, Scott
2022

The internal condition of lithium-ion batteries, in particular State-of-Health (SoH), needs careful monitoring to ensure safe and efficient operation. In this paper, we propose a hybrid online SoH estimation pipeline for series-connected heterogeneous cells. Implementing a single cell parameter estimation scheme for a battery pack with hundreds to thousands of cells is computationally intractable. This challenge is solved in this work using feature-based adaptive polling of cells with "extreme" parameter values. Furthermore, the electrical parameters for the polled cells are estimated...

Spatial and Temporal Factors in Estimating the Potential of Ride-Sharing for Demand Reduction

Tsao, H.-S. Jacob
Lin, Da-Jie
1997

This study reports on a method to accomplish sensor validation and fusion in Intelligent Transportation Systems (ITS). The method is based on probabilistic and fuzzy techniques that express a confidence in the sensor data and take into account environmental factors and the state of the system. Sensor data fusion uses the confidence assigned to each sensor reading and integrates them into one reading. Noise and failure are filtered from the data and lead to a safety improvement in ITS.

Spacing and Capacity Evaluations for Different AHS Concepts

Kanaris, Alexander
Ioannou, Petros
Ho, Fu-sheng
1996

In this study, the authors consider a family of six Automated Highway Systems (AHS) operational concepts. For each concept, the minimum inter- vehicle spacing that could be used for collision-free vehicle following, under different road conditions, is calculated. For architectures involving platoons, the authors also use the alternative constraint of bounded energy collisions to calculate the spacing that can be applied if collisions at a limited relative velocity were allowed. In every case, the minimum spacing in turn, is used to calculate the maximum possible capacity that could be...

Sketch of an IVHS Systems Architecture

Varaiya, P. P.
Shladover, Steven E.
1991

Presents a sketch of a system architecture for the control and management tasks of an intelligent vehicle/highway system (IVHS)

Simulation of IVHS on the Smart Corridor Using the Integration Model: Phase 1: Initial Investigations

Gardes, Yonnel
May, Adolf D.
1993

The general objective of this project is to evaluate the potential benefits of Advanced Traveler Information Systems and Advanced Traffic Management Systems on the Smart Corridor. This report describes Phase 1 of the project in which the INTEGRATION traffic simulation model is used to help simulate ATIS and ATMS on a freeway/arterial environment.

Second Annual Symposium on Advanced Traffic Management Systems (ATMS) and Advanced Traveler Information Systems (ATIS), November 5, 1990

Haldors, Bruce
Bozzini, Anna
May, Adolf D.
1990

The purpose of the Symposium on Advanced Traffic Management Systems (ATMS) and Advanced Traveler Information Systems (ATIS) was to allow researchers involved in ATM/ATIS work to become familiar with other research in those areas in the state of California. This document provides a brief summary outlining the presentations made at the symposium.

Safe Platooning in Automated Highway Systems

Alvarez, Luis
Horowitz, Roberto
1997

This report addresses the problem of designing safe controllers for the hybrid system composed by the interaction of the regulation and coordination layers in the hierarchical California PATH Automated Highway System (AHS) architecture. Conditions to achieve safe platooning under normal mode of operation are investigated. The results that are obtained allow for the decoupling of the design and verification of the regulation and coordination layers in the PATH AHS architecture.

Remaining Useful Life Estimation of Lithium-Ion Batteries Based on Thermal Dynamics

Zhang, Dong
Dey, Satadru
Perez, Hector E.
Moura, Scott J.
2017

Longevity remains one of the key issues for Lithium-ion (Li-ion) battery technology. On-board Intelligent Battery Management Systems (BMS) implement health-conscious control algorithms in order to increase battery lifetime while maintaining the performance. For such algorithms, the information on Remaining Useful Life (RUL) of the battery is crucial for optimizing the battery performance and ensuring minimal degradation. However, accurate prediction of RUL remains one of the most challenging tasks until this date. In this paper, we present an online RUL estimation scheme for Li-ion...

Research and Testing for its Deployment and Operation

Weissenberger, Stein
Dahlgren, Joy
Hickman, Mark
Lo, Hong
1996

In this paper, the authors, although agreeing that deployment is the ultimate goal of Intelligent Transportation Systems (ITS) research and funding, believe that there is not sufficient knowledge of how, why and when to deploy specific ITS functions They contend that continued research and testing (R &T) is still necessary to assure effective future deployment. The article identifies critical needs for R & T and is based to a large degree on the authors' experience in the California PATH research program.