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A General Simulation Framework for Modeling andAnalysis of Heavy-Duty Vehicle Platooning
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Transport Planning, Economics and Engineering.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Platooning heavy-duty vehicles (HDVs) on highway is a method of improving energy and transport efficiency. On the one hand, HDV platoon driving in small inter-vehicle distances could increase highway capacity; on the other hand, HDVs traveling in small inter-vehicle distances experience significant air -drag reduction and therefore, improve fuel efficiency. However, the majority of research has been conducted on the development of platoon system, very few studies have focused on quantification of the impacts of HDV platooning on traffic flow. This paper initializes a simulation framework to facilitate the study of HDVplatooning and establishes corresponding concept and operations.The longitudinal driving behaviors of HDV platoons is modeled in detail considering the acceleration capability of HDV. The proposed framework is applied in three experimental cases, the first case is to study the impacts of HDV platoons on traffic flow, and the second and third cases are about the influence of traffic on HDV platoon formation. In the first case, simulation outcomes show that increasing percentage of HDV platooning in traffic flow generally results in more dramatic improvements in traffic efficiency while preserving traffic safety for passenger vehicles; in the second and third cases, for the HDV platoon formation, deceleration of the first HDV in low speed during platoon formation will increase the formation time to a large extent in medium and heavy traffic.

National Category
Engineering and Technology
Research subject
Transport Science
Identifiers
URN: urn:nbn:se:kth:diva-181929OAI: oai:DiVA.org:kth-181929DiVA: diva2:901945
Projects
iQFleet
Note

QS 2016

Available from: 2016-02-09 Created: 2016-02-09 Last updated: 2016-02-10Bibliographically approved
In thesis
1. Heavy-Duty Vehicle Platooning: Modeling and Analysis
Open this publication in new window or tab >>Heavy-Duty Vehicle Platooning: Modeling and Analysis
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Coupled with the growth of world economy, the demand for freight transport has escalated and will continue to do so. As the traffic intensity increases, the pressure on infrastructure, energy usage and environment becomes higher than ever. Meanwhile, the number of traffic accidents is also increasing year by year as a result. Heavy-duty vehicle (HDV) platooning makes a group of HDVs driving closely after each other.It is one potential solution to improve transport efficiency, traffic safety and fuel economy. Even though there have been extensive studies on the platooning system and corresponding fuel saving, some of the research areas, such as coordination strategies of platooning, platoon operations and the impacts of HDV platooning on trafficflow are still left open. Under a futuristic scenario where a large number of HDVswill be operating in one or several platoons on highway, how to group HDVs intoa platoon and how to select spacing policies for HDV platooning are essential forautomobile manufacturers, fleet operators and transport planners. Therefore, theformation strategies and operations of HDV platoons, as well as the impacts of HDVplatooning on traffic flow have to be carefully investigated.

This thesis presents contributions to the modeling of HDV platooning and simulationof HDV platoon operations. The focus lies mainly on analytical formulation ofspeed-density relation of mixed traffic flow and development of simulation frameworkfor study of HDV platooning. On the one hand, a three-regime speed-density relationis proposed to describe the mixed traffic flow consisting of HDVs and passengercars. The proposed speed-density relation incorporates percentage of HDVs, trafficdensity and spacing policy of HDV platoons as input variables and delivers aggregatehighway velocity as output. By comparing the traffic throughput of no HDV platooningscenario, grouping HDVs into platoon using constant vehicle spacing policy orconstant time gap policy results in significant improvement in highway capacity. On the other hand, a simulation framework is developed for implementation of differentHDV platoon operations. The platoon formation of two HDVs and disaggregation ofa five-HDV platoon at off-ramp are simulated on a two-lane highway. The simulationoutcomes show that HDV platoon formation is more favorable in light and mediumtraffic; disaggregation of a long HDV platoon at off-ramp improves the averagespeed of passenger vehicles considerably at high traffic flow rate.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. xiv, 49 p.
Series
TRITA-TSC-LIC, ISSN 1653-445X ; 15:005
National Category
Engineering and Technology
Research subject
Transport Science
Identifiers
urn:nbn:se:kth:diva-181934 (URN)978-91-87353-83-3 (ISBN)
Presentation
2016-03-08, Ångloket, Teknikringen 10, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20160210

Available from: 2016-02-10 Created: 2016-02-09 Last updated: 2016-02-10Bibliographically approved

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