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2019 IEEE Intelligent Transportation Systems Conference (ITSC)最新文献

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Planning Ahead for EV: Total Travel Time Optimization for Electric Vehicles 电动汽车的提前规划:电动汽车总行程时间优化
Pub Date : 2019-10-01 DOI: 10.1109/ITSC.2019.8917335
Sven Schoenberg, F. Dressler
Travelling long distances with electric vehicles is becoming more viable today. Nevertheless, recharging is still necessary on long trips. As of now, the charging infrastructure is not yet ubiquitous and can be very heterogeneous in terms of charging power. Thus, appropriate route planning is needed, which is still an open research problem. We present an approach to optimize the total travel time for electric vehicles by selecting charging stations and routes, respectively, between origin and destinaton and the charging stations. We also take the possibility into account that driving below the speed limit helps to save energy. In particular, we use a multi-criterion shortest-path search to find the best compromise between the fastest and most economic route. In our approach, we use a non-linear charging model that supports CC-CV and CP-CV charging protocols used for lithium-ion batteries. To achieve acceptable speed for the multi-criterion shortest-path search, we combine contraction hierarchies with precomputation of shortest-path trees. By exploiting the fact that most routes are queried between the known locations of the charging stations, we were able to accelerate these queries by about two orders of magnitude. We compare our proposed adaptive charging and routing strategy to other strategies often cited in the literature. Our results clearly show that we are able to achieve a lower total travel time.
如今,使用电动汽车进行长途旅行变得越来越可行。然而,在长途旅行中充电仍然是必要的。到目前为止,充电基础设施尚未普及,并且在充电功率方面可能非常异构。因此,需要适当的路线规划,这仍然是一个开放的研究问题。本文提出了一种优化电动汽车总行驶时间的方法,即选择充电站和充电站之间的路径。我们也考虑到低于限速驾驶有助于节约能源的可能性。特别是,我们使用多准则最短路径搜索来找到最快和最经济路线之间的最佳折衷。在我们的方法中,我们使用了一种非线性充电模型,该模型支持锂离子电池使用的CC-CV和CP-CV充电协议。为了获得可接受的多准则最短路径搜索速度,我们将最短路径树的预计算与收缩层次结构相结合。通过利用在充电站已知位置之间查询大多数路线的事实,我们能够将这些查询速度提高大约两个数量级。我们将我们提出的自适应充电和路由策略与文献中经常引用的其他策略进行了比较。我们的结果清楚地表明,我们能够实现更低的总旅行时间。
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引用次数: 10
Range-based Cooperative Localization with Nonlinear Observability Analysis 基于距离的非线性可观测性协同定位
Pub Date : 2019-10-01 DOI: 10.1109/ITSC.2019.8916915
Brandon Araki, Igor Gilitschenski, Tatum Ogata, Alex Wallar, Wilko Schwarting, Zareen Choudhury, S. Karaman, D. Rus
Accurate localization of other cars in scenarios such as intersection navigation, intention-aware planning, and guardian systems is a critical component of safety. Multi-robot cooperative localization (CL) provides a method to estimate the joint state of a network of cars by exchanging information between communicating agents. However, there are many challenges to implementing CL algorithms on physical systems, including network delays, unmodeled dynamics, and non-constant velocities. In this work, we present a novel experimental framework for range-based cooperative localization that enables the testing of CL algorithms in realistic conditions, and we perform experiments using up to five cars. For state estimation, we develop and compare a particle filter, an Unscented Kalman Filter, and an Extended Kalman Filter that are compatible with nonlinear dynamics and the asynchronous reception of messages. We also model the relative transform between two unicycle models and perform a nonlinear observability analysis on the system, giving us insight into the measurements required to estimate the system’s state. Our approach enables relative localization of multiple vehicles in the absence of any global reference frame or joint map, and we demonstrate the effectiveness of our system in real-world experiments. Our results show that the UKF is likely the best candidate to use for the CL task.
在十字路口导航、意图感知规划和守护系统等场景中,其他车辆的准确定位是安全的关键组成部分。多机器人协同定位(CL)提供了一种通过通信代理之间交换信息来估计汽车网络联合状态的方法。然而,在物理系统上实现CL算法存在许多挑战,包括网络延迟、未建模的动态和非恒定速度。在这项工作中,我们提出了一个新的基于距离的协同定位实验框架,可以在现实条件下测试CL算法,我们使用多达五辆汽车进行实验。对于状态估计,我们开发并比较了兼容非线性动态和异步消息接收的粒子滤波器、无气味卡尔曼滤波器和扩展卡尔曼滤波器。我们还对两个独轮车模型之间的相对变换进行了建模,并对系统进行了非线性可观测性分析,使我们深入了解了估计系统状态所需的测量。我们的方法可以在没有任何全局参考框架或联合地图的情况下实现多辆车的相对定位,并且我们在现实世界的实验中证明了我们系统的有效性。我们的结果表明,UKF可能是CL任务的最佳候选。
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引用次数: 3
Hierarchical Regional Control for Traffic Grid Signal Optimization 交通网格信号优化的层次区域控制
Pub Date : 2019-10-01 DOI: 10.1109/ITSC.2019.8917513
Lingzhou Shu, Jia Wu, Ziyan Li
Centralized traffic control in a large-scale grid is quite challenging due to the large search space of the policy. To deal with this problem, we propose a hierarchical regional control framework that can learn more quickly and efficiently, based on prior knowledge. Specifically, the traffic at intersections is controlled by local controller based on well-adjusted policies. The coordination of the local controllers is decided by a master controller that is trained by using reinforcement learning. The control of the whole grid is handled solely by learning a master policy. The master controller continuously observes the state of the traffic network and predicts the best possible traffic control strategy for the current state. In this way, the dimension of the action space is dramatically decreased, and it is much easier to explore the optimal policy. We verify our method by implementing a series of experiments in SUMO. The numerical experiments demonstrate that our method outperforms the traditional methods and the new control methods based on deep reinforcement learning in various typical scenarios. We also demonstrate that our method is easy to train and operates robustly.
由于策略的搜索空间大,大规模网格下的集中交通控制具有很大的挑战性。为了解决这一问题,我们提出了一种基于先验知识的分层区域控制框架,该框架可以更快、更有效地学习。具体来说,十字路口的交通由本地控制器根据调整好的策略进行控制。局部控制器的协调由使用强化学习训练的主控制器决定。整个网格的控制完全通过学习一个主策略来处理。主控制器持续观察交通网络的状态,并预测当前状态下可能的最佳交通控制策略。这样,行动空间的维度就大大降低了,探索最优策略就容易得多。我们通过在相扑中实施一系列实验来验证我们的方法。数值实验表明,该方法在各种典型场景下均优于传统方法和基于深度强化学习的新型控制方法。结果表明,该方法易于训练,具有鲁棒性。
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引用次数: 2
Simulation-Based Methods for Validation of Automated Driving: A Model-Based Analysis and an Overview about Methods for Implementation 基于仿真的自动驾驶验证方法:基于模型的分析及实现方法概述
Pub Date : 2019-10-01 DOI: 10.1109/ITSC.2019.8917072
Stefan Jesenski, J. Stellet, Wolfgang Branz, Johann Marius Zöllner
The release of highly automated driving functions requires a thorough validation of safety. In this paper, the recently introduced 3-circles model is recapitulated. Based on the 3-circles model, the possible areas of application of simulations to the validation procedure are analyzed and possible challenges and limitations of simulation-based methods are given and discussed. An overview and classification of current simulation concepts is presented. Afterwards, recent research on the implementation details of simulations is discussed.
高度自动驾驶功能的发布需要对安全性进行彻底的验证。本文概述了最近提出的三圆模型。基于三圈模型,分析了仿真在验证过程中的可能应用领域,并给出和讨论了基于仿真的方法可能面临的挑战和局限性。对当前仿真概念进行了概述和分类。然后,对仿真的实现细节进行了讨论。
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引用次数: 8
Trajectory Planning for a Pseudo Omnidirectional Vehicle using Particle Swarm Optimization 基于粒子群算法的伪全向车辆轨迹规划
Pub Date : 2019-10-01 DOI: 10.1109/ITSC.2019.8917200
Philip Schörner, J. Doll, Maximilian Galm, Johann Marius Zöllner
We propose an online motion planning approach for a pseudo omnidirectional vehicle based on particle swarm optimization. Therefore, we first describe the principles behind the optimization process. Afterwards we derive representations for the vehicle’s movement based on the description of the position of the instantaneous center of motion. Then, the mathematical operators used in the optimization process for the trajectories are described with regard to the previously derived representations. The costfunction is explained with focus on the new opportunities in the movement of the vehicle like e.g. driving sideways. However, the extra degree of freedom not only brings benefits, but also complicates the generation of trajectories for the initial particle swarm. Therefore we describe how to efficiently sample omnidirectional trajectories and also trajectories for certain well known gaits like Ackermann driving. Finally, the approach is evaluated in simulation showing the full maneuverability of the vehicle.
提出了一种基于粒子群优化的伪全向车辆在线运动规划方法。因此,我们首先描述优化过程背后的原则。然后,基于瞬时运动中心位置的描述,导出了车辆运动的表示。然后,根据先前导出的表示描述了轨迹优化过程中使用的数学算子。成本函数的解释重点是车辆运动中的新机会,例如侧向驾驶。然而,额外的自由度不仅带来了好处,也使初始粒子群的轨迹生成变得复杂。因此,我们描述了如何有效地对全向轨迹和某些已知步态(如Ackermann驾驶)的轨迹进行采样。最后,对该方法进行了仿真验证,验证了车辆的全机动性能。
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引用次数: 1
Game theoretic decision making for autonomous vehicles’ merge manoeuvre in high traffic scenarios 大交通场景下自动驾驶车辆归并机动的博弈决策
Pub Date : 2019-10-01 DOI: 10.1109/ITSC.2019.8917314
M. Garzón, A. Spalanzani
This paper presents a game theoretic decision making process for autonomous vehicles. Its goal is to provide a solution for a very challenging task: the merge manoeuvre in high traffic scenarios. Unlike previous approaches, the proposed solution does not rely on vehicle-to-vehicle communication or any specific coordination, moreover, it is capable of anticipating both the actions of other players and their reactions to the autonomous vehicle’s movements.
提出了一种自动驾驶汽车的博弈决策过程。它的目标是为一项非常具有挑战性的任务提供解决方案:高流量场景下的合并机动。与之前的方法不同,提出的解决方案不依赖于车与车之间的通信或任何特定的协调,而且,它能够预测其他玩家的行动以及他们对自动驾驶汽车运动的反应。
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引用次数: 18
Cyber-Physical-Social Motivated Collaborative Platoon Heads Selection for Intelligent and Connected Vehicles 基于网络-物理-社会动机的智能网联车辆协同排长选择
Pub Date : 2019-10-01 DOI: 10.1109/ITSC.2019.8917372
Siru Chen, Pengfei Zhu, W. Yan, Konglin Zhu, Lin Zhang
Vehicle platoon service is considered as a promising framework for Intelligent Transportation System (ITS) to reduce energy cost, and meanwhile enhance driving safety and comfortability. In platoon service, platoon head takes the crucial role for the quality of service. The secure and trustworthy platoon heads with good driving skills will provide a better service than untrusted ones. How to motivate secure platoon heads for the platoon service becomes an interesting problem. In this paper, we formulate the trust platoon heads selection as a platoon utility maximization (PUM) problem. Then we employ game-theoretical approach showing that the PUM game is a potential game, and thus exists a Nash Equilibrium. Furthermore, we propose a cyber-physical-social approach to motivate vehicles to become platoon heads and at the same time maximize the platoon utility by seeking for the Nash Equilibrium. The extensive evaluation results show that the proposed platoon heads selection approach effectively stimulate more trustworthy users to be platoon heads and gains up to 60% more platoon utility compared with baseline methods.
车辆队列服务被认为是智能交通系统(ITS)中一个很有前途的框架,可以降低能源成本,同时提高驾驶安全性和舒适性。在排长服务中,排长对服务质量起着至关重要的作用。安全可靠、驾驶技术好的排长比不可信的排长提供更好的服务。如何为队列服务激励安全的排长成为一个有趣的问题。本文将信任排长选择问题表述为一个排效用最大化问题。然后运用博弈论方法证明了PUM博弈是一个潜在博弈,因此存在纳什均衡。此外,我们提出了一种网络-物理-社会方法来激励车辆成为排长,同时通过寻求纳什均衡来最大化排效用。广泛的评估结果表明,所提出的排长选择方法有效地激励了更多值得信赖的用户成为排长,与基线方法相比,排效用提高了60%。
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引用次数: 2
Ground Vehicle Monocular Visual Odometry 地面车辆单目视觉里程计
Pub Date : 2019-10-01 DOI: 10.1109/ITSC.2019.8917391
M. Sabry, Abdulla Al-Kaff, A. Hussein, Slim Abdennadher
Technology advances in the field of Intelligent Transportation Systems are rapidly increasing to obtain higher autonomy levels, and improve the robustness and reliability of autonomous driving. One of the challenges related to autonomous vehicles is the localization systems especially in GPS-denied environments. This paper presents an enhancement in the monocular visual odometry by exploring the use of one external sensor (encoder); in order to obtain the vehicle speed with computer vision techniques to provide a reliable and real time localization system. The proposed algorithm has been validated by performing real experiments, and the obtained results show the improvement in accuracy comparing to existing stereo visual odometry algorithm, with lower error in translation and rotation of the path points.
为了获得更高的自主水平,提高自动驾驶的鲁棒性和可靠性,智能交通系统领域的技术进步正在迅速增加。与自动驾驶汽车相关的挑战之一是定位系统,特别是在没有gps的环境中。本文通过探索使用一个外部传感器(编码器)来增强单目视觉里程计;利用计算机视觉技术获取车辆的行驶速度,提供可靠、实时的定位系统。通过实际实验验证了该算法的有效性,与现有的立体视觉测距算法相比,该算法的精度得到了提高,路径点的平移和旋转误差更小。
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引用次数: 4
Modeling Individuals' Largest Daily Trip Displacement using Extreme Value Theory 利用极值理论对个体最大日行程位移进行建模
Pub Date : 2019-10-01 DOI: 10.1109/ITSC.2019.8917413
Kaiqiang Xie, Lu Ma, Hui Xiong, Shasha Wu
As a significant factor in urban planning and traffic forecasting, human mobility draws intensive attentions in recent years with the emergence of geo-related data. In this paper, we build models for human mobility with regards to individuals’ largest daily displacement using Extreme Value Theory (EVT) based on nearly 40 million individuals’ trajectories. It is found that the largest daily displacement can be well fitted by the Generalized Pareto Distribution (GPD) and is not heavy tailed compared to the exponential distribution. Besides, we also explored differences in distribution of the largest daily displacement according to gender and weekday. The analysis results indicate that male tend to have a larger displacement and individuals tend to travel longer on weekends.
人口流动作为城市规划和交通预测的重要因素,近年来随着地理相关数据的出现而受到广泛关注。在本文中,我们基于近4000万个人的轨迹,使用极值理论(EVT)建立了关于个人最大日位移的人类流动性模型。发现最大日位移可以用广义帕累托分布(GPD)很好地拟合,并且与指数分布相比没有重尾。此外,我们还探讨了日最大流离失所者在不同性别和工作日的分布差异。分析结果表明,男性在周末的位移更大,个体的出行时间更长。
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引用次数: 0
A Generalized Stochastic Petri Net Model for Performance Analysis of Trackside Infrastructure in Railway Station Areas under Uncertainty * 不确定条件下铁路站区轨道旁基础设施性能分析的广义随机Petri网模型*
Pub Date : 2019-10-01 DOI: 10.1109/ITSC.2019.8917459
Malte Schmidt, N. Weik, Stephan Zieger, A. Schmeink, Nils Nießen
The paper presents a stochastic, infrastructure centered modeling approach for capacity analysis applications in long term planning of railway stations. A formal modeling approach of train operations using generalized stochastic Petri nets is proposed. The model is analyzed based on the embedded Markov chain, which allows for quality based performance metrics including utilization, blocking probabilities and waiting times. The model is validated and tested against simulation in an application scenario for a medium size railway station. In addition, model extensions to large-scale systems are discussed.
本文提出了一种以基础设施为中心的随机建模方法,用于铁路车站长期规划的容量分析。提出了一种基于广义随机Petri网的列车运行形式化建模方法。该模型基于嵌入式马尔可夫链进行分析,该链允许基于质量的性能指标,包括利用率、阻塞概率和等待时间。在一个中型火车站的应用场景中,对该模型进行了验证和仿真测试。此外,还讨论了模型在大系统中的扩展。
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引用次数: 3
期刊
2019 IEEE Intelligent Transportation Systems Conference (ITSC)
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