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Energy-Efficient Torque Allocations for a Two-Axle Four-Wheel-Drive Electric Bus
作者 admin
出版年份 2017 引用
摘要
Optimal torque distribution approaches are introduced for a two-axle dual-motor four-wheel-drive (4WD) electric bus (E-Bus) developed by our team to improve vehicle economical performance. Real-time vehicle speed and demand ...展开全文
Optimal torque distribution approaches are introduced for a two-axle dual-motor four-wheel-drive (4WD) electric bus (E-Bus) developed by our team to improve vehicle economical performance. Real-time vehicle speed and demand torque are taken as the input of these strategies. The objective function is formulated based on the practical energy consumption in both driving and regenerative braking conditions according to the efficiency map of each motor. Two torque distribution strategies-off-line calculation with on-line look-up-table strategy and the fuzzy logic based torque distribution strategy are proposed. Co-simulations with Simulink and TruckSim demonstrate the effectiveness of the two distribution strategies. The comparison with original uniform distribution strategy is also carried out to illustrate the effectiveness on reducing vehicle energy consumption of the two torque distribution strategies. The mileage of E-bus can be improved without extra cost through optimal torque distribution strategies. 收起全文

Distributed receding horizon control of a platoon of multiple CAVs with discontinuous-gear transmissions
作者 admin
出版年份 2016 引用
摘要

Model predictive control-based cooperative lane change strategy for improving traffic flow
作者 Di Wang, Manjiang Hu, Yunpeng Wang, Jianqiang Wang, Hongmao Qin and Yougang Bian
出版年份 2016 引用
摘要
Lane change has attracted more and more attention in recent years for its negative impact on traffic safety and efficiency. However, few researches addressed the multi-vehicle cooperation during lane change process. In this article,...展开全文
Lane change has attracted more and more attention in recent years for its negative impact on traffic safety and efficiency. However, few researches addressed the multi-vehicle cooperation during lane change process. In this article, feasibility criteria of lane change are designed, which considers the acceptable acceleration/deceleration of neighboring vehicles; meanwhile, a cooperative lane change strategy based on model predictive control is proposed in order to attenuate the adverse impacts of lane change on traffic flow. The proposed strategy implements the centralized decision making and active cooperation among the subject vehicle performing lane change in the subject lane and the preceding vehicle and the following vehicle in the target lane during lane change. Using model predictive control, safety, comfort, and traffic efficiency are integrated as the objectives, and lane change process is optimized. Numerical simulation results of the cooperative lane change strategy suggest that the deceleration of following vehicle can be weakened and further the shock wave propagated in traffic flow can be alleviated to some degree compared with traditional lane change.收起全文

Car-following method based on inverse reinforcement learning for autonomous vehicle decision-making
作者 Hongbo Gao,Guanya Shi,Guotao Xie,Bo Cheng
出版年份 2018 引用
摘要
There are still some problems need to be solved though there are a lot of achievements in the fields of automatic driving. One of those problems is the difficulty of designing a car-following d...展开全文
There are still some problems need to be solved though there are a lot of achievements in the fields of automatic driving. One of those problems is the difficulty of designing a car-following decision-making system for complex traffic conditions. In recent years, reinforcement learning shows the potential in solving sequential decision optimization problems. In this article, we establish the reward function R of each driver data based on the inverse reinforcement learning algorithm, and r visualization is carried out, and then driving characteristics and following strategies are analyzed. At last, we show the efficiency of the proposed method by simulation in a highway environment.
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基于行星传动的双模混合动力履带车辆传动系统结构设计
作者 秦兆博,罗禹贡,解来卿,陈文强,李克强
出版年份 2018 引用
摘要
该文提出了一种具有双输出的混联式混合动力履带车辆的传动系统结构设计。该结构具有双输出轴分别连接左、右履带,通过与3排行星齿轮结构连接,可以实现两侧履带的精确独立控制,通过控制发动机工作状态,使车辆的运行效...展开全文
该文提出了一种具有双输出的混联式混合动力履带车辆的传动系统结构设计。该结构具有双输出轴分别连接左、右履带,通过与3排行星齿轮结构连接,可以实现两侧履带的精确独立控制,通过控制发动机工作状态,使车辆的运行效率最优,在充分保证直线行驶性能的同时,增强行进中转向能力。相比于现有的复杂混合动力履带车辆传动系统,该设计可以省去转向机构,并提升系统综合运行能力。采用自动建模的方法对所有可行结构进行动力学分析,结合不同结构类型的特点确定双模结构组合方式。通过系统特性初筛、性能精细筛选得到满足设计要求的结构。通过动态规划算法对所选结构进行典型工况下的燃油经济性分析。仿真结果表明,得到的最优方案比目前常用的串联式混合动力履带推土机具有更优的直线行驶、转向行驶和燃油经济性能。
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A Comparative Study on Coaxial Parallel and Coaxial Parallel-serial Hybrid Architectures for Plug-in Hybrid Electric Buses
作者 Zeyu Yang, Zhanyi Hu, Manjiang Hu, Zhihua Zhong
出版年份 2018 引用
摘要
This paper presents a comparative study on coaxial parallel hybrid (PH) and coaxial parallel-serial hybrid (PSH) powertrain architectures for plug-in hybrid electric buses (PHEB) in the perspective of economical performance. T...展开全文
This paper presents a comparative study on coaxial parallel hybrid (PH) and coaxial parallel-serial hybrid (PSH) powertrain architectures for plug-in hybrid electric buses (PHEB) in the perspective of economical performance. To do so, parameters of main components, including the engine power, the electric motor power, the capacity of battery are selected based on the same dynamic specifications of a PHEB. Then the PH electric bus (PHB) and the PSH electric bus (PSHB) are modeled in Matlab/Simulink, respectively. The dynamic programming (DP) algorithm and the nonlinear model predictive control (NMPC) based energy management controllers are designed to evaluate the fuel consumption and the energy cost of batteries. The simulation results reveal that the electric motors in PSHB possess about 10% higher equivalent efficiency and the PSHB has the superiority of energy saving effect over PHB.收起全文

Double-layer speed optimization for reducing fuel consumption with vehicle-to-infrastructure communication
作者 Biao Xu,Xiaolong Chen ,Keqiang Li ,Manjiang Hu ,Yougang Bian,Qianwen Yu,Jianqiang Wang
出版年份 2019 引用
摘要
Speed profiles affect fuel economy tremendously, especially, when vehicles running on an urban road with numerous signalized intersections. To improve fuel economy, in this study, we propose a d...展开全文
Speed profiles affect fuel economy tremendously, especially, when vehicles running on an urban road with numerous signalized intersections. To improve fuel economy, in this study, we propose a double-layer speed optimization method with real-time computation that considers traffic signal information collected via vehicle-to- infrastructure communication and traffic conditions. In the first layer, we use a Dijkstra algorithm to optimize the average eco-speed between adjacent intersections with full-horizon traffic signal information, and in the second layer, we use an optimal control method to plan a real-time speed profile with average speed constraints. We conduct numerous field tests using a test bed and an experimental vehicle platform. The test results demonstrate that by computing optimal solutions in real time, the proposed double-layer speed optimization method has the potential to improve fuel economy and decrease trip time.
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Distributed conflict-free cooperation for multiple connected vehicles at unsignalized intersections
作者 Biao Xu,Shengbo Eben Li,Yougang Bian,Shen Li,Xuegang Jeff Ban,Jianqiang Wang,Keqiang Li
出版年份 2018 引用
摘要
Connected vehicles will change the modes of future transportation management and organization, especially at intersections. In this paper, we propose a distributed conflict-free cooperation method ...展开全文
Connected vehicles will change the modes of future transportation management and organization, especially at intersections. In this paper, we propose a distributed conflict-free cooperation method for multiple connected vehicles at unsignalized intersections. We firstly project the approaching vehicles from different traffic movements into a virtual lane and introduce a conflict-free geometry topology considering the conflict relationship of involved vehicles, thus constructing a virtual platoon. Then we present the modeling of communication topology to describe two modes of information transmission between vehicles. Finally, a distributed controller is designed to stabilize the virtual platoon for conflict-free cooperation at intersections. Numerical simulations validate the effectiveness of this method.
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