车联网移动无线数据通信系统的设计与实现

为了提高车联网移动无线数据通信能力,实现通过无线数据通信系统对车辆监控与导航,利用RFID和GPS技术,通过对车联网无线数据通信系统的结构分析,设计了车联网移动无线数据通信系统。重点研究了车载终端总体结构、车载终端通信模块、RFID感知通信模块、移动通信平台架构、定位追踪通信模块和远程控制通信模块。应用结果表明,该移动无线数据通信系统有较好显示能力和信息处理能力,能够处理导航、信息服务、车辆信息显示与辅助控制等功能的车载终端信息通信服务的需求。     

基于PWM整流器的高效电动汽车充电机设计

介绍一种用于电动汽车电池充电机的设计实现方法.为满足高功率因数和高效的要求,采用三相PWM整流器和移相全桥变换器两级变换模式.前者基于空间电压矢量PWM直接功率控制（DPC）,实现单位功率因数;后者基于零电压零电流（ZvZCS）控制,实现高效的电能变换.以该方法设计的8 kW的充电机在大部分充电过程中,效率高于84％,输入功率因数高于99.3％.     

基于Arduino的自动避障技术实现

应用Arduino控制板及红外传感器实现了小车自动避障。利用红外线接近开关传感器来获得障碍物信息,经过算法处理后,采用差速方法控制电机,从而实现小车自主避障功能。小车采用直流电机驱动的双后轮,前端万向轮的分布方式,核心数据处理模块选取Arduino控制板。对系统进行了软硬件设计,搭建起了自动避障小车实验平台,并取得了良好的实验效果。     

带末端角度和速度约束的再入飞行器滑模变结构导引律

在考虑末端角度和末端速度约束的前提下,研究滑模变结构导引律在再入飞行器上的应用。推导满足末端角度约束的滑模变结构导引律,给出俯冲平面和转弯平面的导引方程,依据导引方程生成需要攻角、侧滑角制导指令。设计考虑末端速度要求后制导环节产生的附加攻角和侧滑角指令。需要制导指令和附加指令相加得到同时考虑落速和落角情况下的合成攻角、侧滑角指令。仿真表明,滑模导引律能稳定姿态且引导飞行器准确到达目标点。针对不同的运动速度情况,进行了落点偏差、末端速度和末端角度随速度的变化趋势分析,在末端角度控制上两种导引律表现相近,在末端速度和落点偏差上滑模导引律表现明显优于最优导引律,表明滑模变结构导引律针对移动目标具有鲁棒性。     

多无人机时序到达协同控制方法

时序到达控制是无人机协同控制方向新近产生的典型问题, 对异构无人机协同执行搜索、跟踪、打击、评估等任务具有重要潜在价值。引入计算几何学中的Laguerre图用于航路规划, 当两个威胁区域不相交时, Laguerre图生成的初始航路必然从它们之间的空隙内穿过。针对时序控制精度不高的问题, 采用周期性的速度修正方法, 有效提高了到达时间精度。仿真结果表明, 所提出的时序到达控制方法能够有效实现多无人机时序到达, 并且具有较高的鲁棒性和控制精度。     

Operation Strategy of EV Battery Charging and Swapping Station

An operation strategy of the electric vehicle(EV) battery charging and swapping station is proposed in the paper. The strategy is established based on comprehensively consideration of the EV charging behaviors and the possible mutual actions between battery charging and swapping. Three energy management strategies can be used in the station: charging period shifting, energy exchange between EVs, and energy supporting from surplus swapping batteries. Then an optimization model which minimizes the total energy management costs of the station is built. The Monte Carlo simulation is applied to analyze the characteristics of the EV battery charging load, and a heuristic algorithm is used to solve the strategy providing the relevant information of EVs and the battery charging and swapping station. The operation strategy can efficiently reduce battery charging during the high electricity price periods and make more reasonable use of the resources. Simulations prove the feasibility and rationality of the strategy.     

无刷直流电机在独轮车驱动系统中的应用

本文提出了一种无刷直流电机应用在独轮车驱动系统中的设计方案,使用全数字实现,在不额外增加传感器设备的情况下,实现了较低的电磁转矩脉动控制。实验结果表明,该系统性能良好,符合独轮车的应用要求。     

基于物联网的智能安全管理系统设计与实现

为构建未来智慧型城区形态,提出一种新理念的社区管理——智慧社区,拟设计一种基于物联网技术的区域性智能安全管理系统,以RFID技术为核心支撑技术,主要是针对人员、车辆、物资的综合管控系统(RFID管控系统),该RFID管控系统是面向封闭式或社区式的特定管控区域,对所有进出区域的人员、车辆和物资的身份信息和状态信息实现全面感知,并在统一的监控平台上实现对上述人员、车辆及物资的综合管控。同时,系统具备可扩展性,为未来的扩充应用预留接口。     

End-to-End Rate Adaptation to Support Heterogeneous Services for Infrastructure-Based Vehicular Networks

Vehicle to Infrastructure(V2I) communications aim to provide mobile users on the road low-cost Internet and driver safety services.However, to meet Quality of Service(QoS) requirements of various applications and efficiently utilize limited wireless channel resourc-es, the transport layer protocol has to perform effective rate control in low channel quality and frequent changing topology communica-tion environment. In this paper, we propose a novel rate-control scheme in infrastructure based vehicular networks that avoids conges-tion and starvation and promotes fairness in end-to-end V2I communications. In vehicular networks, a bottleneck roadside unit(RSU)keeps track of its buffer size, aggregate incoming rate, and link throughput, and appropriately allocates bandwidth to traversing flows.With feedback information from the RSU, source nodes dynamically adjust their sending rates to avoid buffer overflow or starvation atthe bottleneck RSU. Simulation results show that the proposed scheme can reduce not only packet losses owing to buffer overflow butalso buffer starvation time, which improves the utilization efficiency of wireless channel resource.     

An Overview of Internet of Vehicles

The new era of the Internet of Things is driving the evolution of conventional Vehicle Ad-hoc Networks into the lnternet of Vehicles （IoV）. With the rapid development of computation and communication technologies, loV promises huge commercial interest and research value, thereby attracting a large number of companies and researchers. This paper proposes an abstract network model of the IoV, discusses the technologies required to create the IoV, presents different applications based on certain currently existing technologies, provides several open research challenges and describes essential future research in the area of loV.