Alternate Fuel Vehicles

A Network Spatial Analysis Simulating Response Time to Calls for Service at Variable Staffing Levels

Clark, Callie
Dangwal, Chitra
Kato, Dylan
Marta Gonzalez
2022

In light of recent events, there has been a surge in discussions of defunding police. On one hand, policy that reduces police presence aims to reduce frequency of police violence. On the other hand, downsizing the police force triggers concerns of public safety and police response time. In this work, we use spatial analysis to examine the impact a reduced police force may have on response time. Modeling the transportation system of Chicago as a network, we simulate the response of police officers from stations to incidents. We then use this simulation to calculate the impacts of resource...

Deadline Differentiated Dynamic EV Charging Price Menu Design

Lu, Chenbei
Wu, Jiaman
Cui, Jingshi
Xu, Yanyan
Wu, Chenye
Marta Gonzalez
2023

The increasing number of electric vehicles (EVs) on the road brings both opportunities and challenges to the power system. For the EV charging stations (EVCSs), it is often difficult to conduct effective operations due to the incomplete information in EVs’ departure times and the opacity of their preference information. To tackle this challenge, we seek to design the optimal deadline differentiated dynamic price menu that offers multiple choice-pairs of deadlines and charging prices. We prove that such price menus can incentivize EVs to truthfully reveal their departure time. We then...

Power Management System for a Fuel Cell/Battery Hybrid Vehicle Incorporating Fuel Cell and Battery Degradation

Wang, Yongqiang
Scott Moura
Advani, Suresh G.
Prasad, Ajay K.
2019

Optimization of fuel cell/battery hybrid vehicle systems has primarily focused on reducing fuel consumption. However, it is also necessary to focus on fuel cell and battery durability as inadequate lifespan is still a major barrier to the commercialization of fuel cell vehicles. Here, we introduce a power management strategy which concurrently accounts for fuel consumption as well as fuel cell and battery degradation. Fuel cell degradation is quantified using a simplified electrochemical model which provides an analytical solution for the decay of the electrochemical surface area (ECSA) in...

Optimization of Powerplant Component Size on Board a Fuel Cell/Battery Hybrid Bus for Fuel Economy and System Durability

Wang, Yongqiang
Scott Moura
Advani, Suresh G.
Prasad, Ajay K.
2019

The size of the individual powerplant components on board a fuel cell/battery hybrid vehicle affects the power management strategy which determines both the fuel economy and the durability of the fuel cell and the battery, and thus the average lifetime cost of the vehicle. Cost is one of the major barriers to the commercialization of fuel cell vehicles, therefore it is important to study how the sizing configuration affects overall vehicle cost. In this paper, degradation models for the fuel cell and the battery on board a fuel cell/battery hybrid bus are incorporated into the power...

Improving Bay Area Rapid Transit (BART) District Connectivity and Access with the Segway Human Transporter and Other Low Speed Mobility Devices

Rodier, Caroline J.
Susan Shaheen
Novick, Linda
2004

Access to transit stations is a significant barrier to transit use in many urban regions. Parking during peak hours is often limited, and many individuals are only willing to walk about a quarter mile to transit stations (Cervero, 2001). While there are some effective feeder services (e.g., shuttles) that help extend the range of transit access, these systems are limited because of fixed routes and schedules. A number of strategies have recently been implemented to improve transit access and transit use, including bicycles, electric bicycles, carsharing, and personal neighborhood electric...

Multiple Time Scale Energy Management for a Fuel Cell Ship Propulsion System

Shi, Junzhe
Jiang, Shida
Flø Aarsnes, Ulf Jakob
Nærhcim, Dagfinn
Scott Moura
2024

Electrified propulsion systems, such as fuel cells (FCs) and batteries, are a promising solution to decarbonize the shipping sector. In this paper, we have conducted a comprehensive analysis of two months' worth of real-world container ship power demand data. From this analysis, we propose a novel multi-time scale Energy Management System (EMS) approach for a hybrid FC/battery propulsion system. This approach enables the individual control of each FC stack while factoring in battery and FC degradation losses and fuel consumption costs. By exploring different time scales, we have assessed...

Dynamics in Behavioral Response to Fuel-Cell Vehicle Fleet and Hydrogen Fueling Infrastructure

Susan Shaheen
Martin, Elliot
Lipman, Timothy E.
2008

Transportation is a major contributor of carbon dioxide (CO2) and other greenhouse gas emissions from human activity. It accounts for approximately 14% of total anthropogenic emissions globally and about 27% in the United States. Growing concern regarding the impacts of climate change and greenhouse gas emissions has led to innovations in automotive and fueltechnology. However, behavioral response to the newest transportation technologies, such as hydrogen fuel cell vehicles (FCVs) and fueling infrastructure, is not well understood. This paper examines the results of an exploratory F-Cell...

Exploratory Field Test of Early Fleet Niches for Hydrogen Fuel Cell Vehicles and Fueling Infrastructure

Martin, Elliot
Susan Shaheen
Lipman, Timothy E., PhD
Lidicker, Jeffrey
2009

Over the last several decades, hydrogen fuel cell vehicles (FCVs) have emerged as a zero tailpipe-emission alternative to the battery electric vehicle (EV). There are key questions about consumer reaction and response to operations and refueling of FCVs. This report presents the results of a “ride-and-drive” clinic series (n=182) held in 2007 with a Mercedes-Benz A-Class “F-Cell” hydrogen FCV. The clinic evaluated participant reactions to driving and riding in an FCV, as well as witnessing a vehicle-refueling event. The respondents entered the clinic with a strong interest in alternative...

Behavioral Response to Hydrogen Fuel Cell Vehicles and Refueling: Results of California Drive Clinics

Martin, Elliot
Susan Shaheen
Lipman, Timothy E.
Lidicker, Jeffrey R.
2009

Over the last several decades, hydrogen fuel cell vehicles (FCVs) have emerged as a zero tailpipe-emission alternative to the battery electric vehicle (EV). To address questions about consumer reaction to FCVs, this report presents the results of a “ride-and-drive” clinic series (n=182) held in 2007 with a Mercedes-Benz A-Class “F-Cell” hydrogen FCV. The clinic evaluated participant reactions to driving and riding in an FCV, as well as vehicle refueling. Pre-and post clinic surveys assessed consumer response. More than 80% left with a positive overall impression of hydrogen. The majority...

Assessment of the Benefits from Signal Hardware Improvements

Alexander Skabardonis
Deakin, E A
University of California, Berkeley
1995

Signal equipment upgrades (e.g., multiple timing plan capability and/or signal interconnection) are commonly used to improve the quality of traffic flow in urban arterials and networks. These signal control improvements generally result in considerable delay, stops and fuel savings but the benefits vary widely on different networks. Procedures are needed to provide guidance on the benefits likely to be achieved from improving signal hardware. This report discusses the major factors that influence signal equipment performance and presents the findings of the assessment of the impacts from...